/* ====================================================================
   i4cn WordPress Theme — Main Stylesheet
   1:1 还原 i4.cn 视觉设计
   ====================================================================

   目录：
   00. CSS 变量 / Design Tokens
   01. Reset & Base
   02. 排版基础
   03. 顶部公告条 (Notice Bar)
   04. 导航头部 (Header / Nav)
   05. 移动端汉堡菜单
   06. 首屏 Banner 轮播 (Hero Slider)
   07. 产品入口卡片区 (Product Entry)
   08. 固件下载专区 (Firmware Section)
   09. 教程列表区 (Tutorial Section)
   10. 资讯流 (News Feed)
   11. 工具功能介绍 (Tools Feature)
   12. 资源下载区 (Resource Section)
   13. 侧边栏 (Sidebar)
   14. 页脚 (Footer)
   15. 通用组件：Badge / Button / Card
   16. 面包屑 (Breadcrumb)
   17. 分页 (Pagination)
   18. 固件归档页 (Archive Firmware)
   19. 固件详情页 (Single Firmware)
   20. 文章/教程详情页 (Single Post)
   21. 搜索结果页 (Search)
   22. FAQ 页
   23. 404 页面
   24. 搜索联想下拉 (Suggest Dropdown)
   25. 下载弹窗 (Download Modal)
   26. 吸顶导航 (Sticky Header)
   27. 响应式适配 (Responsive)
   ==================================================================== */

/* ====================================================================
   00. CSS 变量 / Design Tokens
   ==================================================================== */
:root {
  /* 主色 — 爱思蓝 */
  --c-primary:       #1677ff;
  --c-primary-hover: #0e5fd8;
  --c-primary-light: #e6f0ff;
  --c-primary-dark:  #0a4ab8;

  /* 辅助色 */
  --c-success:       #52c41a;
  --c-success-light: #f0fff4;
  --c-warning:       #fa8c16;
  --c-warning-light: #fff7e6;
  --c-danger:        #ff4d4f;
  --c-danger-light:  #fff1f0;
  --c-info:          #13c2c2;

  /* 中性色阶 */
  --c-black:        #000000;
  --c-gray-900:     #1a1a1a;
  --c-gray-800:     #262626;
  --c-gray-700:     #404040;
  --c-gray-600:     #595959;
  --c-gray-500:     #8c8c8c;
  --c-gray-400:     #bfbfbf;
  --c-gray-300:     #d9d9d9;
  --c-gray-200:     #f0f0f0;
  --c-gray-100:     #f5f5f5;
  --c-gray-50:      #fafafa;
  --c-white:        #ffffff;

  /* 背景色 */
  --c-bg-page:      #f4f6f8;
  --c-bg-card:      #ffffff;
  --c-bg-header:    #ffffff;
  --c-bg-notice:    #1677ff;
  --c-bg-footer:    #1d2126;
  --c-bg-footer-bottom: #141820;

  /* 文字色 */
  --c-text-primary:   #1a1a1a;
  --c-text-secondary: #595959;
  --c-text-muted:     #8c8c8c;
  --c-text-white:     #ffffff;
  --c-text-link:      #1677ff;

  /* 边框色 */
  --c-border:        #e8e8e8;
  --c-border-light:  #f0f0f0;
  --c-border-focus:  #1677ff;

  /* 阴影 */
  --shadow-sm:   0 1px 4px rgba(0,0,0,.06);
  --shadow-md:   0 2px 12px rgba(0,0,0,.08);
  --shadow-lg:   0 4px 24px rgba(0,0,0,.12);
  --shadow-card: 0 2px 8px rgba(0,0,0,.07);
  --shadow-hover: 0 6px 20px rgba(22,119,255,.18);

  /* 圆角 */
  --r-sm:   4px;
  --r-md:   8px;
  --r-lg:   12px;
  --r-xl:   16px;
  --r-2xl:  20px;
  --r-full: 9999px;

  /* 尺寸 */
  --header-h:        64px;
  --notice-h:        38px;
  --container-max:   1200px;
  --sidebar-w:       300px;

  /* 过渡 */
  --transition:      all .2s ease;
  --transition-slow: all .35s ease;

  /* 字体 */
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
               "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Consolas", monospace;
}

/* ====================================================================
   01. Reset & Base
   ==================================================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.6;
  color: var(--c-text-primary);
  background: var(--c-bg-page);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--c-text-link);
  text-decoration: none;
  transition: var(--transition);
}
a:hover { color: var(--c-primary-hover); }

img {
  max-width: 100%;
  height: auto;
  display: block;
}

ul, ol { list-style: none; }

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  outline: none;
  border: none;
}

button { cursor: pointer; background: none; }

/* ====================================================================
   02. 排版基础
   ==================================================================== */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 20px;
}

.section {
  padding: 40px 0;
}

/* ====================================================================
   通用区块标题（统一风格：蓝色竖线 + 标题 + 更多链接）
   ==================================================================== */
.section__header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 24px;
}

.section__title {
  font-size: 22px;
  font-weight: 800;
  color: #1a1a1a;
  position: relative;
  padding-left: 14px;
  line-height: 1.3;
}

.section__title::before {
  content: '';
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 4px;
  background: #1677ff;
  border-radius: 2px;
}

.section__more {
  font-size: 13px;
  color: var(--c-text-muted, #999);
  display: flex;
  align-items: center;
  gap: 4px;
  transition: var(--transition, 0.2s ease);
  white-space: nowrap;
}
.section__more:hover { color: #1677ff; }
.section__more svg { transition: transform 0.2s ease; }
.section__more:hover svg { transform: translateX(3px); }

/* ====================================================================
   03. 顶部公告条 (Notice Bar)
   ==================================================================== */
.notice-bar {
  background: var(--c-bg-notice);
  height: var(--notice-h);
  display: flex;
  align-items: center;
  overflow: hidden;
  position: relative;
  z-index: 1000;
}

.notice-bar__inner {
  display: flex;
  align-items: center;
  width: 100%;
  gap: 12px;
}

.notice-bar__icon {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  color: rgba(255,255,255,.8);
  font-size: 13px;
  white-space: nowrap;
}

.notice-bar__track {
  flex: 1;
  overflow: hidden;
  position: relative;
  height: 100%;
  display: flex;
  align-items: center;
}

.notice-bar__scroll {
  display: flex;
  white-space: nowrap;
  animation: noticeScroll 30s linear infinite;
  gap: 60px;
}

.notice-bar__scroll:hover { animation-play-state: paused; }

.notice-bar__item {
  font-size: 13px;
  color: rgba(255,255,255,.95);
  transition: var(--transition);
}
.notice-bar__item:hover { color: #fff; text-decoration: underline; }

.notice-bar__close {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,.7);
  border-radius: var(--r-full);
  transition: var(--transition);
}
.notice-bar__close:hover {
  background: rgba(255,255,255,.15);
  color: #fff;
}

@keyframes noticeScroll {
  0%   { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

/* ====================================================================
   04. 导航头部 (Header / Nav)
   ==================================================================== */
.site-header {
  background: #fff;
  height: 64px;
  border-bottom: 1px solid #ebebeb;
  position: sticky;
  top: 0;
  z-index: 900;
  transition: box-shadow .25s ease, background .25s ease;
}

.site-header.is-scrolled {
  box-shadow: 0 2px 16px rgba(0,0,0,.09);
  background: rgba(255,255,255,.97);
  backdrop-filter: blur(10px);
}

.site-header__inner {
  height: 100%;
  display: flex;
  align-items: center;
  gap: 0;
  padding: 0 24px;
  max-width: 1200px;
  margin: 0 auto;
}

/* ── Logo ── */
.site-logo {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 8px;
  margin-right: 40px;
  text-decoration: none;
}

.site-logo__img {
  height: 32px;
  width: auto;
}

.site-logo__text {
  font-size: 20px;
  font-weight: 800;
  color: #1677ff;
  letter-spacing: -.5px;
}

/* ── 主导航 ── */
.primary-nav {
  display: flex;
  align-items: center;
  height: 100%;
  /* 不设 flex:1，让搜索框 margin-left:auto 推到右边 */
}

.primary-nav__list {
  display: flex;
  align-items: center;
  height: 100%;
  gap: 20px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.primary-nav__item {
  position: relative;
  height: 100%;
  display: flex;
  align-items: center;
}

.primary-nav__link {
  display: flex;
  align-items: center;
  padding: 0 18px;
  height: 36px;
  font-size: 14px;
  font-weight: 500;
  color: #333;
  white-space: nowrap;
  border-radius: 8px;
  position: relative;
  transition: color .18s ease, background .18s ease;
  text-decoration: none;
}

/* 悬停背景 + 颜色 */
.primary-nav__link:hover {
  color: #1677ff;
  background: #f0f5ff;
}

/* 当前页高亮：蓝色文字 + 底部线条 */
.primary-nav__item.current-menu-item .primary-nav__link,
.primary-nav__item.current-menu-ancestor .primary-nav__link {
  color: #1677ff;
  font-weight: 600;
}

.primary-nav__item.current-menu-item .primary-nav__link::after,
.primary-nav__item.current-menu-ancestor .primary-nav__link::after {
  content: '';
  position: absolute;
  bottom: -14px; /* 距导航底边 */
  left: 14px;
  right: 14px;
  height: 2px;
  background: #1677ff;
  border-radius: 2px 2px 0 0;
}

/* 子菜单 */
.primary-nav__item:hover > .sub-menu,
.primary-nav__item:focus-within > .sub-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  pointer-events: auto;
}

.primary-nav .sub-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 160px;
  background: #fff;
  border: 1px solid #ebebeb;
  border-radius: 10px;
  box-shadow: 0 8px 28px rgba(0,0,0,.1);
  padding: 6px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity .2s ease, transform .2s ease, visibility .2s ease;
  pointer-events: none;
  z-index: 100;
  list-style: none;
  margin: 0;
}

.primary-nav .sub-menu li a {
  display: block;
  padding: 8px 12px;
  font-size: 13px;
  color: #333;
  border-radius: 6px;
  transition: background .15s, color .15s;
  text-decoration: none;
}

.primary-nav .sub-menu li a:hover {
  background: #f0f5ff;
  color: #1677ff;
}

/* ── 搜索框 ── */
.header-search {
  position: relative;
  margin-left: auto;
  margin-right: 14px;
}

.header-search__form {
  display: flex;
  align-items: center;
}

.header-search__input {
  width: 190px;
  height: 34px;
  background: #f5f5f5;
  border: 1px solid transparent;
  border-radius: 9999px;
  padding: 0 36px 0 14px;
  font-size: 13px;
  color: #1a1a1a;
  transition: all .2s ease;
}
.header-search__input::placeholder { color: #aaa; }
.header-search__input:focus {
  background: #fff;
  border-color: #1677ff;
  box-shadow: 0 0 0 3px rgba(22,119,255,.1);
  width: 230px;
  outline: none;
}

.header-search__btn {
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  color: #aaa;
  display: flex;
  align-items: center;
  transition: color .18s;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}
.header-search__btn:hover { color: #1677ff; }

/* ── 右侧下载按钮 ── */
.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.header-dl-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 36px;
  padding: 0 18px;
  background: linear-gradient(135deg, #1677ff, #0958d9);
  color: #fff !important;
  font-size: 13px;
  font-weight: 600;
  border-radius: 9999px;
  white-space: nowrap;
  text-decoration: none;
  transition: all .2s ease;
  box-shadow: 0 3px 10px rgba(22,119,255,.35);
  border: none;
  cursor: pointer;
}
.header-dl-btn:hover {
  background: linear-gradient(135deg, #0958d9, #003eb3);
  box-shadow: 0 5px 16px rgba(22,119,255,.45);
  transform: translateY(-1px);
  color: #fff !important;
}
.header-dl-btn:active {
  transform: translateY(0);
  box-shadow: 0 2px 8px rgba(22,119,255,.3);
}

.header-dl-btn svg {
  flex-shrink: 0;
}

/* 移动端汉堡按钮 */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  border-radius: var(--r-md);
  padding: 6px;
  transition: var(--transition);
}
.nav-toggle:hover { background: var(--c-gray-100); }

.nav-toggle__bar {
  width: 100%;
  height: 2px;
  background: var(--c-gray-700);
  border-radius: 2px;
  transition: var(--transition);
  transform-origin: center;
}

.nav-toggle.is-open .nav-toggle__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle.is-open .nav-toggle__bar:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.nav-toggle.is-open .nav-toggle__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ====================================================================
   05. 移动端抽屉菜单
   ==================================================================== */
.mobile-nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 280px;
  height: 100%;
  background: #fff;
  z-index: 1100;
  transform: translateX(-100%);
  transition: transform .3s ease;
  box-shadow: 4px 0 24px rgba(0,0,0,.12);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}
.mobile-nav.is-open { transform: translateX(0); }

.mobile-nav__header {
  padding: 20px 20px 16px;
  border-bottom: 1px solid var(--c-border-light);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.mobile-nav__close {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--c-text-muted);
  border-radius: var(--r-md);
}
.mobile-nav__close:hover { background: var(--c-gray-100); }

.mobile-nav__list { padding: 12px 0; }

.mobile-nav__item {
  border-bottom: 1px solid var(--c-border-light);
}
.mobile-nav__item:last-child { border-bottom: none; }

.mobile-nav__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  font-size: 15px;
  color: var(--c-text-primary);
  font-weight: 500;
  transition: var(--transition);
}
.mobile-nav__link:hover,
.mobile-nav__item.current .mobile-nav__link {
  color: var(--c-primary);
  background: var(--c-primary-light);
}

.mobile-nav__footer {
  padding: 20px;
  margin-top: auto;
  border-top: 1px solid var(--c-border-light);
}

.mobile-nav__dl-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  height: 44px;
  background: var(--c-primary);
  color: #fff !important;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--r-lg);
}

.nav-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.4);
  z-index: 1050;
  opacity: 0;
  pointer-events: none;
  transition: opacity .3s ease;
}
.nav-overlay.is-visible {
  opacity: 1;
  pointer-events: auto;
}

/* ====================================================================
   06. 首屏 Banner 轮播 (Hero Slider)
   ==================================================================== */
.hero-slider {
  position: relative;
  overflow: hidden;
  height: 420px;
}

.hero-slider__track {
  display: flex;
  height: 100%;
  transition: transform .55s cubic-bezier(.25,.46,.45,.94);
  will-change: transform;
}

.hero-slider__slide {
  flex-shrink: 0;
  width: 100%;
  height: 100%;
  position: relative;
  overflow: hidden;
}

.hero-slider__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  transition: transform 6s ease;
  display: block;
}

.hero-slider__slide.is-active .hero-slider__bg {
  transform: scale(1.04);
}

.hero-slider__overlay {
  position: absolute;
  inset: 0;
  /* 无渐变遮罩，让背景图完全展示 */
}

.hero-slider__content {
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 100%;
  padding: 0 60px;
}

.hero-slider__title {
  font-size: 36px;
  font-weight: 800;
  color: #fff;
  line-height: 1.3;
  text-shadow: 0 2px 12px rgba(0,0,0,.3);
  /* 默认可见，非 active slide 才隐藏 */
  opacity: 1;
  transform: translateY(0);
  transition: opacity .5s .2s, transform .5s .2s;
}

.hero-slider__subtitle {
  font-size: 16px;
  color: rgba(255,255,255,.85);
  margin-top: 12px;
  text-shadow: 0 1px 6px rgba(0,0,0,.2);
  opacity: 1;
  transform: translateY(0);
  transition: opacity .5s .35s, transform .5s .35s;
}

.hero-slider__actions {
  margin-top: 28px;
  display: flex;
  gap: 12px;
  opacity: 1;
  transform: translateY(0);
  transition: opacity .5s .5s, transform .5s .5s;
}

/* 非 active 的 slide 内容隐藏，由 JS 控制 is-active */
.hero-slider__slide:not(.is-active) .hero-slider__title,
.hero-slider__slide:not(.is-active) .hero-slider__subtitle,
.hero-slider__slide:not(.is-active) .hero-slider__actions {
  opacity: 0;
  transform: translateY(20px);
}

.hero-slider__slide.is-active .hero-slider__title,
.hero-slider__slide.is-active .hero-slider__subtitle,
.hero-slider__slide.is-active .hero-slider__actions {
  opacity: 1;
  transform: translateY(0);
}

.hero-slider__btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 44px;
  padding: 0 24px;
  border-radius: var(--r-full);
  font-size: 15px;
  font-weight: 600;
  transition: var(--transition);
  cursor: pointer;
}

.hero-slider__btn--primary {
  background: var(--c-primary);
  color: #fff;
  box-shadow: 0 4px 16px rgba(22,119,255,.4);
}
.hero-slider__btn--primary:hover {
  background: var(--c-primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(22,119,255,.5);
  color: #fff;
}

.hero-slider__btn--secondary {
  background: rgba(255,255,255,.15);
  color: #fff;
  border: 1px solid rgba(255,255,255,.5);
  backdrop-filter: blur(6px);
}
.hero-slider__btn--secondary:hover {
  background: rgba(255,255,255,.25);
  color: #fff;
}

.hero-slider__btn--green {
  background: var(--c-success);
  color: #fff;
  box-shadow: 0 4px 16px rgba(82,196,26,.4);
}
.hero-slider__btn--green:hover {
  background: #3ca010;
  color: #fff;
}

/* 箭头 */
.hero-slider__arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 10;
  width: 44px;
  height: 44px;
  background: rgba(255,255,255,.15);
  border: 1px solid rgba(255,255,255,.3);
  border-radius: var(--r-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  cursor: pointer;
  transition: var(--transition);
  backdrop-filter: blur(4px);
}
.hero-slider__arrow:hover {
  background: rgba(255,255,255,.3);
  transform: translateY(-50%) scale(1.08);
}
.hero-slider__arrow--prev { left: 20px; }
.hero-slider__arrow--next { right: 20px; }

/* 指示器 */
.hero-slider__dots {
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
  z-index: 10;
}

.hero-slider__dot {
  width: 8px;
  height: 8px;
  background: rgba(255,255,255,.5);
  border-radius: var(--r-full);
  cursor: pointer;
  transition: var(--transition);
  border: none;
}
.hero-slider__dot.is-active {
  background: #fff;
  width: 24px;
}

/* ====================================================================
   07. 产品入口卡片区（横排：图标左 / 内容右，还原原站风格）
   ==================================================================== */
.products-section {
  background: var(--c-white);
  padding: 36px 0;
}

.products-section__header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 24px;
}

.section__subtitle {
  font-size: 13px;
  color: #999;
  margin-top: 6px;
}

.products-section__all {
  font-size: 13px;
  color: #999;
  text-decoration: none;
  transition: color .2s;
}
.products-section__all:hover { color: #1677ff; }

.products-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

/* ── 产品卡片（横排）── */
.product-card {
  display: flex;                    /* 横排：图标左、内容右 */
  flex-direction: row;
  align-items: center;
  gap: 18px;
  padding: 22px 20px;
  border: 1px solid #e8e8e8;
  border-radius: 14px;
  background: #fff;
  transition: border-color .2s, box-shadow .2s, transform .2s;
  cursor: default;
  overflow: hidden;
}

.product-card:hover {
  border-color: #1677ff;
  box-shadow: 0 8px 24px rgba(22,119,255,.12);
  transform: translateY(-2px);
}

.product-card__icon {
  flex-shrink: 0;
  width: 60px;
  height: 60px;
  border-radius: 16px;
  overflow: hidden;
  background: linear-gradient(135deg, #f0f5ff, #e6f0ff);
  display: flex;
  align-items: center;
  justify-content: center;
}
.product-card__icon img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 12px;
}
/* SVG 默认颜色 */
.product-card__icon svg {
  width: 28px;
  height: 28px;
  stroke: #1677ff;
}

.product-card__body {
  flex: 1;
  min-width: 0;                     /* 关键：允许文字截断 */
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.product-card__name {
  font-size: 17px;
  font-weight: 700;
  color: #1a1a1a;
  line-height: 1.3;
  display: flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  overflow: hidden;
}

.product-card__badge {
  display: inline-flex;
  align-items: center;
  padding: 1px 8px;
  border-radius: 9999px;
  font-size: 11px !important;
  font-weight: 600 !important;
  letter-spacing: .5px;
  vertical-align: middle;
  flex-shrink: 0;

  /* 根据内容自动变色 */
}
/* 角标颜色映射 */
.product-card__badge[data-badge="热门"],
.product-card__badge[data-badge="hot"] {
  background: #f0f5ff;
  color: #1677ff;
}
.product-card__badge[data-badge="官方"],
.product-card__badge[data-badge="official"] {
  background: #f6ffed;
  color: #52c41a;
}
.product-card__badge[data-badge="NEW"],
.product-card__badge[data-badge="新版本"],
.product-card__badge* :is([data-badge="V"]) {
  background: #fff7e6;
  color: #faad14;
}
.product-card__badge:not([data-badge]) {
  background: #e6f7ff;
  color: #1677ff;
}

.product-card__desc {
  font-size: 13px;
  color: #888;
  line-height: 1.55;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 10px;
}

.product-card__actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  height: 32px;
  padding: 0 16px;
  border-radius: 9999px;
  font-size: 12px;
  font-weight: 600;
  line-height: 1;
  transition: all .18s ease;
  cursor: pointer;
  white-space: nowrap;
  border: 1px solid transparent;
  text-decoration: none;
  flex-shrink: 0;
}

.btn--primary {
  background: #1677ff;
  color: #fff;
  border-color: #1677ff;
}
.btn--primary:hover {
  background: #0958d9;
  border-color: #0958d9;
  color: #fff;
  box-shadow: 0 3px 10px rgba(22,119,255,.3);
}

.btn--outline {
  background: transparent;
  color: #1677ff;
  border-color: #1677ff;
}
.btn--outline:hover {
  background: #f0f5ff;
  color: #0958d9;
  border-color: #0958d9;
}

.btn--sm {
  height: 26px;
  padding: 0 10px;
  font-size: 11px;
}

.btn--lg {
  height: 42px;
  padding: 0 24px;
  font-size: 15px;
  font-weight: 600;
}

/* ====================================================================
   08. 固件下载专区
   ==================================================================== */
.firmware-section {
  background: var(--c-white);
  border-radius: var(--r-xl);
  padding: 32px;
  box-shadow: var(--shadow-card);
}

/* 设备分类 tabs */
.device-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--c-border);
  padding-bottom: 0;
}

.device-tab {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 18px;
  border-radius: var(--r-md) var(--r-md) 0 0;
  font-size: 14px;
  font-weight: 500;
  color: var(--c-text-secondary);
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid transparent;
  border-bottom: none;
  position: relative;
  bottom: -1px;
}
.device-tab:hover { color: var(--c-primary); background: var(--c-primary-light); }
.device-tab.is-active {
  color: var(--c-primary);
  background: var(--c-white);
  border-color: var(--c-border);
  font-weight: 600;
}

/* 机型选择器 */
.model-select-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.model-select {
  height: 36px;
  padding: 0 32px 0 12px;
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  background: #fff url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%238c8c8c' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E") no-repeat right 10px center;
  -webkit-appearance: none;
  font-size: 14px;
  color: var(--c-text-primary);
  cursor: pointer;
  min-width: 180px;
  transition: var(--transition);
}
.model-select:focus { border-color: var(--c-primary); box-shadow: 0 0 0 3px rgba(22,119,255,.1); }

/* 固件表格 */
.firmware-table-wrap {
  overflow-x: auto;
  border-radius: var(--r-lg);
  border: 1px solid var(--c-border);
}

.firmware-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.firmware-table thead tr {
  background: var(--c-gray-50);
  border-bottom: 1px solid var(--c-border);
}

.firmware-table th {
  padding: 12px 16px;
  font-weight: 600;
  color: var(--c-text-secondary);
  text-align: left;
  white-space: nowrap;
}

.firmware-table tbody tr {
  border-bottom: 1px solid var(--c-border-light);
  transition: var(--transition);
}
.firmware-table tbody tr:last-child { border-bottom: none; }
.firmware-table tbody tr:hover { background: var(--c-gray-50); }

.firmware-table td {
  padding: 12px 16px;
  color: var(--c-text-primary);
  vertical-align: middle;
}

.firmware-can-flash {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 13px;
}
.firmware-can-flash--yes { color: var(--c-success); }
.firmware-can-flash--no  { color: var(--c-danger); }

.firmware-dl-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  height: 30px;
  padding: 0 14px;
  background: var(--c-primary);
  color: #fff;
  border-radius: var(--r-full);
  font-size: 12px;
  font-weight: 600;
  transition: var(--transition);
  white-space: nowrap;
}
.firmware-dl-btn:hover {
  background: var(--c-primary-hover);
  color: #fff;
  box-shadow: 0 3px 10px rgba(22,119,255,.3);
  transform: translateY(-1px);
}

/* ====================================================================
   09. 教程列表区（首页热门教程）
   ==================================================================== */
.tutorials-section { background: transparent; padding: 36px 0; }

.tutorials-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.tutorial-card {
  display: flex;
  flex-direction: column;
  background: #fff;
  border-radius: 12px;
  border: 1px solid #e8e8e8;
  box-shadow: 0 1px 3px rgba(0,0,0,.06);
  overflow: hidden;
  transition: all .25s ease;
}
.tutorial-card:hover {
  border-color: #1677ff;
  box-shadow: 0 6px 20px rgba(22,119,255,.12);
  transform: translateY(-3px);
}

.tutorial-card__thumb {
  position: relative;
  width: 100%;
  height: 160px;
  overflow: hidden;
  background: linear-gradient(135deg, #f0f5ff 0%, #e6f4ff 50%, #d6e8ff 100%);
  display: flex;
  align-items: center;
  justify-content: center;
}
.tutorial-card__thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .35s ease;
}
/* 无封面图时显示 logo 占位 */
.tutorial-card__thumb .tutorial-thumb-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  color: rgba(22,119,255,.45);
}
.tutorial-card__thumb .tutorial-thumb-placeholder svg {
  width: 48px;
  height: 48px;
}
.tutorial-card__thumb .tutorial-thumb-placeholder span {
  font-size: 13px;
  font-weight: 500;
}
.tutorial-card:hover .tutorial-card__thumb img {
  transform: scale(1.06);
}

.tutorial-card__body {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.tutorial-card__cat {
  display: inline-block;
  padding: 2px 10px;
  background: #f0f5ff;
  color: #1677ff;
  font-size: 11px;
  font-weight: 600;
  border-radius: 20px;
  align-self: flex-start;
}

.tutorial-card__title {
  font-size: 15px;
  font-weight: 700;
  color: #1a1a1a;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  transition: color .2s;
}
.tutorial-card__title a { color: inherit; text-decoration: none; }
.tutorial-card:hover .tutorial-card__title,
.tutorial-card:hover .tutorial-card__title a { color: #1677ff; }

.tutorial-card__meta {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 12px;
  color: #999;
  margin-top: auto;
  padding-top: 6px;
}

.tutorial-card__meta-item {
  display: flex;
  align-items: center;
  gap: 4px;
}

/* ====================================================================
   10. 资讯流 (News Feed)
   ==================================================================== */
.news-section { background: transparent; }

.news-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  background: var(--c-bg-card);
  border-radius: var(--r-lg);
  border: 1px solid var(--c-border-light);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.news-item {
  display: flex;
  gap: 16px;
  padding: 16px 20px;
  border-bottom: 1px solid var(--c-border-light);
  transition: var(--transition);
  align-items: flex-start;
}
.news-item:last-child { border-bottom: none; }
.news-item:hover { background: var(--c-gray-50); }

.news-item__thumb {
  flex-shrink: 0;
  width: 100px;
  height: 68px;
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--c-gray-100);
}
.news-item__thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .35s ease;
}
.news-item:hover .news-item__thumb img { transform: scale(1.06); }

.news-item__body { flex: 1; min-width: 0; }

.news-item__title {
  font-size: 15px;
  font-weight: 600;
  color: var(--c-text-primary);
  line-height: 1.5;
  margin-bottom: 6px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  transition: var(--transition);
}
.news-item:hover .news-item__title { color: var(--c-primary); }

.news-item__excerpt {
  font-size: 13px;
  color: var(--c-text-secondary);
  line-height: 1.5;
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.news-item__meta {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 12px;
  color: var(--c-text-muted);
}

.news-item__meta-item {
  display: flex;
  align-items: center;
  gap: 4px;
}

/* ====================================================================
   11. 工具功能介绍模块
   ==================================================================== */
.tools-section {
  background: linear-gradient(135deg, #0d1b3e 0%, #1677ff 100%);
  padding: 60px 0;
  border-radius: var(--r-2xl);
  overflow: hidden;
}

.tools-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0;
}

.tool-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 28px 20px;
  border-right: 1px solid rgba(255,255,255,.1);
  text-align: center;
  transition: var(--transition);
  cursor: default;
}
.tool-item:last-child { border-right: none; }
.tool-item:hover { background: rgba(255,255,255,.06); }

.tool-item__icon {
  width: 56px;
  height: 56px;
  background: rgba(255,255,255,.12);
  border-radius: var(--r-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 14px;
  transition: var(--transition);
}
.tool-item:hover .tool-item__icon {
  background: rgba(255,255,255,.2);
  transform: scale(1.08);
}

.tool-item__icon svg { color: #fff; }

.tool-item__name {
  font-size: 15px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 6px;
}

.tool-item__desc {
  font-size: 12px;
  color: rgba(255,255,255,.7);
  line-height: 1.5;
}

/* ====================================================================
   12. 资源下载区
   ==================================================================== */
.resources-section { background: transparent; }

.resources-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.resource-card {
  background: var(--c-bg-card);
  border: 1px solid var(--c-border-light);
  border-radius: var(--r-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}
.resource-card:hover {
  border-color: var(--c-primary);
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

.resource-card__thumb {
  width: 100%;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: var(--c-gray-100);
}
.resource-card__thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .35s ease;
}
.resource-card:hover .resource-card__thumb img { transform: scale(1.05); }

.resource-card__body { padding: 12px 14px; }

.resource-card__type {
  display: inline-block;
  padding: 2px 8px;
  background: var(--c-warning-light);
  color: var(--c-warning);
  font-size: 11px;
  font-weight: 600;
  border-radius: var(--r-full);
  margin-bottom: 6px;
}

.resource-card__title {
  font-size: 14px;
  font-weight: 600;
  color: var(--c-text-primary);
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  line-height: 1.5;
  transition: var(--transition);
}
.resource-card:hover .resource-card__title { color: var(--c-primary); }

.resource-card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  border-top: 1px solid var(--c-border-light);
  font-size: 12px;
  color: var(--c-text-muted);
}

.resource-card__dl-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  height: 26px;
  padding: 0 12px;
  background: var(--c-primary);
  color: #fff;
  border-radius: var(--r-full);
  font-size: 12px;
  font-weight: 600;
  transition: var(--transition);
}
.resource-card__dl-btn:hover {
  background: var(--c-primary-hover);
  color: #fff;
}

/* ====================================================================
   13. 侧边栏
   ==================================================================== */
.sidebar {
  width: var(--sidebar-w);
  flex-shrink: 0;
}

.sidebar-widget {
  background: var(--c-bg-card);
  border: 1px solid var(--c-border-light);
  border-radius: var(--r-lg);
  overflow: hidden;
  margin-bottom: 20px;
  box-shadow: var(--shadow-sm);
}

.sidebar-widget__title {
  padding: 14px 18px;
  font-size: 15px;
  font-weight: 700;
  color: var(--c-text-primary);
  border-bottom: 1px solid var(--c-border-light);
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--c-gray-50);
}

/* ── WordPress 原生 Widget 样式适配 ── */
.widget_recent_entries ul,
.widget_recent_comments ul,
.wp-block-latest-posts {
  list-style: none; margin: 0; padding: 12px 18px;
}
.widget_recent_entries ul li,
.wp-block-latest-posts li {
  margin-bottom: 8px;
}
.widget_recent_entries ul li a,
.wp-block-latest-posts a {
  font-size: 13px;
  color: var(--c-text-primary);
  line-height: 1.5;
  display: block;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.widget_recent_entries ul li a:hover,
.wp-block-latest-posts a:hover {
  color: var(--c-primary);
}

/* 块编辑器小工具容器适配 */
.widget > .wp-block-group {
  background: var(--c-bg-card);
  border: 1px solid var(--c-border-light);
  border-radius: var(--r-lg);
  overflow: hidden;
  margin-bottom: 20px;
  box-shadow: var(--shadow-sm);
}
.widget .wp-block-heading {
  padding: 14px 18px !important;
  font-size: 15px !important;
  font-weight: 700 !important;
  color: var(--c-text-primary) !important;
  border-bottom: 1px solid var(--c-border-light) !important;
  background: var(--c-gray-50) !important;
  margin: 0 !important;
}

.sidebar-widget__title::before {
  content: '';
  display: block;
  width: 3px;
  height: 14px;
  background: var(--c-primary);
  border-radius: 2px;
}

.sidebar-widget__body { padding: 14px 18px; }

/* 热门排行列表 */
.rank-list { display: flex; flex-direction: column; gap: 0; }

.rank-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 0;
  border-bottom: 1px solid var(--c-border-light);
  transition: var(--transition);
}
.rank-item:last-child { border-bottom: none; }
.rank-item:hover .rank-item__title { color: var(--c-primary); }

.rank-item__num {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--r-sm);
  font-size: 12px;
  font-weight: 700;
}

.rank-item__num--1 { background: #ff4d4f; color: #fff; }
.rank-item__num--2 { background: #fa8c16; color: #fff; }
.rank-item__num--3 { background: #fadb14; color: #595959; }
.rank-item__num--other { background: var(--c-gray-200); color: var(--c-text-muted); }

.rank-item__title {
  flex: 1;
  font-size: 13px;
  color: var(--c-text-primary);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  transition: var(--transition);
}

.rank-item__views {
  flex-shrink: 0;
  font-size: 11px;
  color: var(--c-text-muted);
}

/* 最新固件侧边栏列表 */
.fw-list { display: flex; flex-direction: column; gap: 0; }

.fw-item {
  padding: 10px 0;
  border-bottom: 1px solid var(--c-border-light);
  transition: var(--transition);
}
.fw-item:last-child { border-bottom: none; }
.fw-item:hover .fw-item__version { color: var(--c-primary); }

.fw-item__device {
  font-size: 12px;
  color: var(--c-text-muted);
  margin-bottom: 2px;
}

.fw-item__version {
  font-size: 13px;
  font-weight: 600;
  color: var(--c-text-primary);
  transition: var(--transition);
}

.fw-item__meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 4px;
}

/* ====================================================================
   14. 页脚
   ==================================================================== */
.site-footer {
  background: var(--c-bg-footer);
  color: rgba(255,255,255,.7);
  margin-top: 60px;
}

.footer-main {
  padding: 48px 0 32px;
  border-bottom: 1px solid rgba(255,255,255,.08);
}

.footer-main__inner {
  display: grid;
  grid-template-columns: 260px repeat(4, 1fr);
  gap: 40px;
}

.footer-brand__logo {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
  text-decoration: none;
}

.footer-brand__logo-text {
  font-size: 18px;
  font-weight: 800;
  color: #fff;
}

.footer-brand__desc {
  font-size: 13px;
  line-height: 1.7;
  color: rgba(255,255,255,.55);
  margin-bottom: 20px;
}

.footer-brand__social {
  display: flex;
  gap: 10px;
}

.footer-social-btn {
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255,255,255,.08);
  border-radius: var(--r-md);
  color: rgba(255,255,255,.6);
  transition: var(--transition);
}
.footer-social-btn:hover {
  background: var(--c-primary);
  color: #fff;
  transform: translateY(-2px);
}

.footer-nav__title {
  font-size: 14px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
}

.footer-nav__list { display: flex; flex-direction: column; gap: 10px; }

.footer-nav__link {
  font-size: 13px;
  color: rgba(255,255,255,.55);
  transition: var(--transition);
}
.footer-nav__link:hover { color: #fff; }

/* 页脚底栏 */
.footer-bottom {
  background: var(--c-bg-footer-bottom);
  padding: 16px 0;
}

.footer-bottom__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-bottom__left {
  font-size: 12px;
  color: rgba(255,255,255,.4);
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.footer-bottom__link {
  color: rgba(255,255,255,.4);
  transition: var(--transition);
}
.footer-bottom__link:hover { color: rgba(255,255,255,.7); }

.footer-bottom__sep {
  color: rgba(255,255,255,.2);
}

.footer-bottom__right {
  font-size: 12px;
  color: rgba(255,255,255,.3);
}

/* ====================================================================
   15. Badge 组件
   ==================================================================== */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border-radius: var(--r-full);
  font-size: 11px;
  font-weight: 600;
  white-space: nowrap;
}

.badge--green  { background: var(--c-success-light); color: #389e0d; }
.badge--orange { background: var(--c-warning-light);  color: #d46b08; }
.badge--blue   { background: var(--c-primary-light);  color: var(--c-primary); }
.badge--red    { background: var(--c-danger-light);   color: #cf1322; }
.badge--gray   { background: var(--c-gray-200);       color: var(--c-text-muted); }

/* ====================================================================
   16. 面包屑
   ==================================================================== */
.breadcrumb {
  padding: 12px 0;
  font-size: 13px;
}

.breadcrumb__list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0;
}

.breadcrumb__item {
  display: flex;
  align-items: center;
  color: var(--c-text-muted);
}

.breadcrumb__link {
  color: var(--c-text-muted);
  transition: var(--transition);
}
.breadcrumb__link:hover { color: var(--c-primary); }

.breadcrumb__current {
  color: var(--c-text-secondary);
  font-weight: 500;
}

.breadcrumb__sep {
  margin: 0 6px;
  color: var(--c-gray-300);
  font-size: 12px;
}

/* ====================================================================
   17. 分页
   ==================================================================== */
.pagination {
  display: flex;
  justify-content: center;
  padding: 32px 0 16px;
}

.pagination__list {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.pagination__item a,
.pagination__item span {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 36px;
  height: 36px;
  padding: 0 8px;
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  font-size: 14px;
  color: var(--c-text-primary);
  background: #fff;
  transition: var(--transition);
}

.pagination__item a:hover {
  border-color: var(--c-primary);
  color: var(--c-primary);
  background: var(--c-primary-light);
}

.pagination__item--active span,
.pagination__item--active a {
  background: var(--c-primary);
  border-color: var(--c-primary);
  color: #fff;
  font-weight: 600;
}

.pagination__item .page-numbers.dots {
  border: none;
  background: transparent;
  color: var(--c-text-muted);
}

/* ====================================================================
   18. 固件归档页
   ==================================================================== */
.firmware-archive {
  display: flex;
  gap: 24px;
}

.firmware-archive__main { flex: 1; min-width: 0; }

/* 机型详情卡片 */
.device-info-card {
  background: var(--c-bg-card);
  border: 1px solid var(--c-border-light);
  border-radius: var(--r-xl);
  padding: 28px;
  margin-bottom: 24px;
  box-shadow: var(--shadow-card);
  display: flex;
  gap: 28px;
  align-items: flex-start;
}

.device-info-card__img {
  flex-shrink: 0;
  width: 120px;
  text-align: center;
}
.device-info-card__img img { max-height: 160px; }

.device-info-card__content { flex: 1; }

.device-info-card__name {
  font-size: 22px;
  font-weight: 800;
  color: var(--c-text-primary);
  margin-bottom: 16px;
}

.device-specs {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px 24px;
}

.device-spec {
  display: flex;
  gap: 8px;
  font-size: 13px;
}

.device-spec__label {
  flex-shrink: 0;
  color: var(--c-text-muted);
  min-width: 60px;
}

.device-spec__value { color: var(--c-text-primary); font-weight: 500; }

/* ====================================================================
   19. 固件详情单页
   ==================================================================== */
.firmware-detail {
  display: flex;
  gap: 24px;
}

.firmware-detail__main { flex: 1; min-width: 0; }

.firmware-info-card {
  background: var(--c-bg-card);
  border: 1px solid var(--c-border-light);
  border-radius: var(--r-xl);
  padding: 32px;
  box-shadow: var(--shadow-card);
  margin-bottom: 24px;
}

.firmware-info-card__header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 28px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--c-border-light);
}

.firmware-version-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: var(--c-primary-light);
  border-radius: var(--r-lg);
  font-size: 22px;
  font-weight: 800;
  color: var(--c-primary);
}

.firmware-info-table { width: 100%; border-collapse: collapse; }

.firmware-info-table tr { border-bottom: 1px solid var(--c-border-light); }
.firmware-info-table tr:last-child { border-bottom: none; }
.firmware-info-table th {
  width: 120px;
  padding: 12px 0;
  font-size: 14px;
  font-weight: 600;
  color: var(--c-text-muted);
  text-align: left;
  vertical-align: top;
}
.firmware-info-table td {
  padding: 12px 0;
  font-size: 14px;
  color: var(--c-text-primary);
  word-break: break-all;
}

.checksum-code {
  font-family: var(--font-mono);
  font-size: 13px;
  background: var(--c-gray-100);
  padding: 4px 8px;
  border-radius: var(--r-sm);
  word-break: break-all;
}

.firmware-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 24px;
}

.firmware-actions .btn--primary {
  height: 44px;
  padding: 0 28px;
  font-size: 15px;
}

/* ====================================================================
   20. 文章/教程详情页
   ==================================================================== */
.single-layout {
  display: flex;
  gap: 24px;
  align-items: flex-start;
}

.single-main { flex: 1; min-width: 0; }

.article-card {
  background: var(--c-bg-card);
  border: 1px solid var(--c-border-light);
  border-radius: var(--r-xl);
  padding: 40px 48px;
  box-shadow: var(--shadow-card);
}

.article-header { margin-bottom: 28px; }

.article-categories {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.article-category-link {
  padding: 3px 10px;
  background: var(--c-primary-light);
  color: var(--c-primary);
  font-size: 12px;
  font-weight: 600;
  border-radius: var(--r-full);
  transition: var(--transition);
}
.article-category-link:hover { background: var(--c-primary); color: #fff; }

.article-title {
  font-size: 26px;
  font-weight: 800;
  color: var(--c-text-primary);
  line-height: 1.4;
  margin-bottom: 16px;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 13px;
  color: var(--c-text-muted);
  flex-wrap: wrap;
}

.article-meta-item {
  display: flex;
  align-items: center;
  gap: 5px;
}

.article-featured-img {
  width: 100%;
  border-radius: var(--r-lg);
  overflow: hidden;
  margin-bottom: 28px;
}
.article-featured-img img {
  width: 100%;
  max-height: 400px;
  object-fit: cover;
}

/* 文章正文内容 */
.article-content {
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-text-primary);
}

.article-content h1,
.article-content h2,
.article-content h3,
.article-content h4,
.article-content h5,
.article-content h6 {
  font-weight: 700;
  color: var(--c-text-primary);
  line-height: 1.4;
  margin: 28px 0 14px;
}
.article-content h2 {
  font-size: 20px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--c-border);
}
.article-content h3 { font-size: 17px; }
.article-content h4 { font-size: 15px; }

.article-content p { margin-bottom: 16px; }

.article-content img {
  max-width: 100%;
  border-radius: var(--r-md);
  margin: 16px auto;
}

.article-content a {
  color: var(--c-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.article-content ul,
.article-content ol {
  padding-left: 24px;
  margin-bottom: 16px;
}

.article-content li {
  margin-bottom: 8px;
  list-style: disc;
}
.article-content ol li { list-style: decimal; }

.article-content blockquote {
  border-left: 4px solid var(--c-primary);
  background: var(--c-primary-light);
  padding: 16px 20px;
  border-radius: 0 var(--r-md) var(--r-md) 0;
  margin: 20px 0;
  color: var(--c-text-secondary);
}

.article-content pre,
.article-content code {
  font-family: var(--font-mono);
  background: var(--c-gray-900);
  color: #e6edf3;
  border-radius: var(--r-md);
}
.article-content pre {
  padding: 20px;
  overflow-x: auto;
  margin: 20px 0;
  font-size: 13px;
  line-height: 1.7;
}
.article-content code {
  padding: 2px 6px;
  font-size: 13px;
}
.article-content pre code {
  background: none;
  padding: 0;
}

.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
}
.article-content table th,
.article-content table td {
  padding: 10px 14px;
  border: 1px solid var(--c-border);
  font-size: 14px;
}
.article-content table th {
  background: var(--c-gray-50);
  font-weight: 600;
}

/* 上下篇 */
.article-nav {
  display: flex;
  gap: 16px;
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--c-border-light);
}

.article-nav__item {
  flex: 1;
  padding: 16px 20px;
  background: var(--c-gray-50);
  border-radius: var(--r-lg);
  border: 1px solid var(--c-border);
  transition: var(--transition);
}
.article-nav__item:hover { border-color: var(--c-primary); background: var(--c-primary-light); }

.article-nav__label {
  font-size: 12px;
  color: var(--c-text-muted);
  margin-bottom: 6px;
}
.article-nav__title {
  font-size: 14px;
  font-weight: 600;
  color: var(--c-text-primary);
  transition: var(--transition);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.article-nav__item:hover .article-nav__title { color: var(--c-primary); }

/* ====================================================================
   21. 搜索结果页
   ==================================================================== */
.search-header {
  background: var(--c-bg-card);
  padding: 32px;
  border-radius: var(--r-xl);
  margin-bottom: 24px;
  box-shadow: var(--shadow-card);
}

.search-header h1 {
  font-size: 22px;
  font-weight: 700;
  color: var(--c-text-primary);
  margin-bottom: 16px;
}

.search-form-large {
  display: flex;
  gap: 0;
  max-width: 600px;
}

.search-form-large__input {
  flex: 1;
  height: 46px;
  padding: 0 20px;
  border: 2px solid var(--c-border);
  border-right: none;
  border-radius: var(--r-lg) 0 0 var(--r-lg);
  font-size: 15px;
  color: var(--c-text-primary);
  background: #fff;
  transition: var(--transition);
}
.search-form-large__input:focus { border-color: var(--c-primary); }

.search-form-large__btn {
  height: 46px;
  padding: 0 24px;
  background: var(--c-primary);
  color: #fff;
  border-radius: 0 var(--r-lg) var(--r-lg) 0;
  font-size: 15px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: var(--transition);
}
.search-form-large__btn:hover { background: var(--c-primary-hover); }

.search-count {
  margin-bottom: 20px;
  font-size: 14px;
  color: var(--c-text-muted);
}
.search-count span { color: var(--c-primary); font-weight: 600; }

/* ====================================================================
   22. FAQ 页面
   ==================================================================== */
.faq-list { display: flex; flex-direction: column; gap: 12px; }

.faq-item {
  background: var(--c-bg-card);
  border: 1px solid var(--c-border-light);
  border-radius: var(--r-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}
.faq-item.is-open { border-color: var(--c-primary); box-shadow: var(--shadow-hover); }

.faq-item__q {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 24px;
  cursor: pointer;
  font-size: 15px;
  font-weight: 600;
  color: var(--c-text-primary);
  transition: var(--transition);
  user-select: none;
}
.faq-item.is-open .faq-item__q { color: var(--c-primary); background: var(--c-primary-light); }

.faq-item__icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--c-gray-200);
  border-radius: var(--r-full);
  color: var(--c-text-muted);
  transition: var(--transition);
}
.faq-item.is-open .faq-item__icon {
  background: var(--c-primary);
  color: #fff;
  transform: rotate(45deg);
}

.faq-item__a {
  max-height: 0;
  overflow: hidden;
  transition: max-height .35s ease, padding .35s ease;
}
.faq-item.is-open .faq-item__a {
  max-height: 600px;
}

.faq-item__a-inner {
  padding: 16px 24px 20px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-text-secondary);
  border-top: 1px solid var(--c-border-light);
}

/* ====================================================================
   23. 404 页面
   ==================================================================== */
.page-404 {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 80px 20px;
  text-align: center;
}

.page-404__code {
  font-size: 120px;
  font-weight: 900;
  color: var(--c-gray-200);
  line-height: 1;
  margin-bottom: 16px;
  background: linear-gradient(135deg, var(--c-primary) 0%, #a855f7 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.page-404__title {
  font-size: 26px;
  font-weight: 700;
  color: var(--c-text-primary);
  margin-bottom: 12px;
}

.page-404__desc {
  font-size: 15px;
  color: var(--c-text-muted);
  margin-bottom: 32px;
  max-width: 400px;
}

.page-404__actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ====================================================================
   24. 搜索联想下拉
   ==================================================================== */
.search-suggest {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  right: 0;
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-lg);
  z-index: 500;
  overflow: hidden;
  max-height: 360px;
  overflow-y: auto;
  opacity: 0;
  pointer-events: none;
  transform: translateY(-8px);
  transition: opacity .2s, transform .2s;
}

.search-suggest.is-open {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.suggest-list { padding: 8px 0; }

.suggest-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  cursor: pointer;
  transition: var(--transition);
}
.suggest-item:hover { background: var(--c-gray-50); }
.suggest-item.is-active { background: var(--c-primary-light); }

.suggest-item__type {
  flex-shrink: 0;
  padding: 2px 7px;
  background: var(--c-gray-200);
  color: var(--c-text-muted);
  font-size: 11px;
  font-weight: 600;
  border-radius: var(--r-full);
  white-space: nowrap;
}

.suggest-item__title {
  flex: 1;
  font-size: 14px;
  color: var(--c-text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.suggest-empty {
  padding: 20px;
  text-align: center;
  font-size: 14px;
  color: var(--c-text-muted);
}

/* ====================================================================
   25. 下载弹窗
   ==================================================================== */
.dl-modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.5);
  backdrop-filter: blur(4px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity .25s ease;
}
.dl-modal-overlay.is-open {
  opacity: 1;
  pointer-events: auto;
}

.dl-modal {
  background: #fff;
  border-radius: var(--r-2xl);
  width: 460px;
  max-width: 90vw;
  box-shadow: var(--shadow-lg);
  transform: translateY(20px) scale(.97);
  transition: transform .3s ease;
  overflow: hidden;
}
.dl-modal-overlay.is-open .dl-modal {
  transform: translateY(0) scale(1);
}

.dl-modal__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px 16px;
  border-bottom: 1px solid var(--c-border-light);
}

.dl-modal__title {
  font-size: 17px;
  font-weight: 700;
  color: var(--c-text-primary);
}

.dl-modal__close {
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--c-text-muted);
  border-radius: var(--r-md);
  transition: var(--transition);
}
.dl-modal__close:hover { background: var(--c-gray-100); color: var(--c-text-primary); }

.dl-modal__body { padding: 24px; }

.dl-option {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 18px 20px;
  border: 2px solid var(--c-border);
  border-radius: var(--r-lg);
  margin-bottom: 12px;
  cursor: pointer;
  transition: var(--transition);
}
.dl-option:last-child { margin-bottom: 0; }
.dl-option:hover {
  border-color: var(--c-primary);
  background: var(--c-primary-light);
}

.dl-option__icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--c-gray-100);
  border-radius: var(--r-md);
  flex-shrink: 0;
  color: var(--c-primary);
}

.dl-option__body { flex: 1; }

.dl-option__name {
  font-size: 15px;
  font-weight: 600;
  color: var(--c-text-primary);
  margin-bottom: 2px;
}

.dl-option__desc {
  font-size: 12px;
  color: var(--c-text-muted);
}

.dl-option__arrow {
  color: var(--c-text-muted);
  transition: var(--transition);
}
.dl-option:hover .dl-option__arrow {
  color: var(--c-primary);
  transform: translateX(3px);
}

/* ====================================================================
   26. 吸顶加载 & 进度条
   ==================================================================== */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: var(--c-primary);
  z-index: 2000;
  transition: width .1s linear;
  border-radius: 0 3px 3px 0;
}

/* 回到顶部按钮 */
.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 80px;
  width: 42px;
  height: 42px;
  background: var(--c-primary);
  color: #fff;
  border-radius: var(--r-full);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 16px rgba(22,119,255,.3);
  cursor: pointer;
  z-index: 800;
  opacity: 0;
  transform: translateY(10px);
  pointer-events: none;
  transition: var(--transition);
}
.back-to-top.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}
.back-to-top:hover {
  background: var(--c-primary-hover);
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
}

/* ====================================================================
   27. 响应式适配
   ==================================================================== */

/* 平板端 (≤1024px) */
@media (max-width: 1024px) {
  :root {
    --container-max: 100%;
    --sidebar-w: 260px;
  }

  .container { padding: 0 16px; }

  .primary-nav__link { padding: 0 10px; font-size: 13px; }

  .header-search__input { width: 150px; }
  .header-search__input:focus { width: 180px; }

  .products-grid { grid-template-columns: repeat(3, 1fr); }

  .tools-grid { grid-template-columns: repeat(3, 1fr); }
  .tool-item:nth-child(3) { border-right: none; }

  .resources-grid { grid-template-columns: repeat(2, 1fr); }

  .footer-main__inner { grid-template-columns: 1fr 1fr 1fr; gap: 28px; }
  .footer-brand { grid-column: 1 / -1; }
}

/* 移动端 (≤768px) */
@media (max-width: 768px) {
  :root {
    --header-h: 56px;
    --notice-h: 36px;
  }

  .primary-nav,
  .header-search,
  .header-actions { display: none; }

  .nav-toggle { display: flex; margin-left: auto; }

  .hero-slider { height: 240px; }
  .hero-slider__content { padding: 0 20px; }
  .hero-slider__title { font-size: 20px; }
  .hero-slider__subtitle { font-size: 13px; margin-top: 8px; }
  .hero-slider__actions { margin-top: 16px; }
  .hero-slider__btn { height: 36px; padding: 0 16px; font-size: 13px; }
  .hero-slider__arrow { width: 36px; height: 36px; }

  .products-grid { grid-template-columns: 1fr; gap: 12px; }
  .product-card { flex-direction: column; padding: 16px; }
  .product-card__icon { width: 48px; height: 48px; margin-bottom: 10px; }
  .product-card__desc { -webkit-line-clamp: 3; margin-bottom: 12px; }
  .product-card__actions { gap: 6px; }
  .product-card__actions .btn { height: 30px; padding: 0 12px; font-size: 11px; }

  .firmware-section { padding: 20px 16px; border-radius: var(--r-lg); }
  .device-tabs { gap: 4px; }
  .device-tab { padding: 8px 12px; font-size: 13px; }

  .tutorials-grid { grid-template-columns: 1fr; }
  .tutorial-card__thumb { height: 180px; }
  .tutorial-card__body { padding: 14px; }

  .tools-grid { grid-template-columns: repeat(2, 1fr); }
  .tool-item:nth-child(2) { border-right: none; }
  .tool-item:nth-child(3) { border-right: 1px solid rgba(255,255,255,.1); }
  .tool-item:nth-child(4) { border-right: none; }
  .tool-item:nth-child(5) { border-right: none; }

  .resources-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }

  .firmware-archive,
  .firmware-detail,
  .single-layout {
    flex-direction: column;
  }

  .sidebar { width: 100%; }

  .device-info-card { flex-direction: column; gap: 16px; }
  .device-info-card__img { width: 100%; text-align: center; }
  .device-specs { grid-template-columns: 1fr; }

  .article-card { padding: 20px 16px; }
  .article-title { font-size: 20px; }

  .footer-main__inner { grid-template-columns: 1fr 1fr; gap: 24px; }

  .footer-bottom__inner { flex-direction: column; align-items: flex-start; gap: 8px; }

  .tools-section { border-radius: 0; }

  .back-to-top { right: 16px; bottom: 70px; }

  .dl-modal { width: 90vw; }
}

/* 移动端 (≤768px) 补充 */
@media (max-width: 768px) {

  /* ── 首页布局：单列，去掉侧边栏 ── */
  .home-layout {
    flex-direction: column;
  }
  .home-layout .sidebar {
    width: 100%;
    order: 2;
  }
  .home-layout .home-main {
    width: 100%;
    order: 1;
  }

  /* ── section 标题 ── */
  .section-title { font-size: 18px; }
  .section-header { margin-bottom: 16px; }

  /* ── 公告条文字 ── */
  .notice-bar__text { font-size: 12px; }

  /* ── 产品卡片 ── */
  .product-card__icon { width: 40px; height: 40px; }
  .product-card__name { font-size: 14px; }
  .product-card__desc { font-size: 12px; }

  /* ── 固件区 Tab 横向滚动 ── */
  .device-tabs {
    overflow-x: auto;
    flex-wrap: nowrap;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }
  .device-tabs::-webkit-scrollbar { display: none; }
  .device-tab { white-space: nowrap; }

  /* ── 固件表格 ── */
  .fw-table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }
  .fw-table { min-width: 520px; }
  .fw-table th,
  .fw-table td { padding: 10px 12px; font-size: 13px; }

  /* ── 资讯卡片 ── */
  .news-card { flex-direction: column; }
  .news-card__thumb { width: 100%; height: 180px; }
  .news-card__body { padding: 12px; }
  .news-card__title { font-size: 15px; }

  /* ── 教程卡片 ── */
  .tutorials-grid { grid-template-columns: 1fr; }

  /* ── 资源卡片 ── */
  .resources-grid { grid-template-columns: 1fr; gap: 12px; }

  /* ── 工具区 ── */
  .tools-grid { grid-template-columns: repeat(2, 1fr); }

  /* ── 页脚 ── */
  .footer-main__inner { gap: 20px; }
  .footer-nav__title { font-size: 14px; }
  .footer-nav__link { font-size: 13px; }

  /* ── 首页侧边栏下移后的间距 ── */
  .sidebar-home { margin-top: 24px; }
  .sidebar-widget { margin-bottom: 16px; }
}

/* 小屏手机 (≤480px) */
@media (max-width: 480px) {
  .hero-slider { height: 200px; }
  .hero-slider__title { font-size: 18px; }
  .hero-slider__subtitle { display: none; }
  .hero-slider__arrow { display: none; }

  /* Banner 内容居中 */
  .hero-slider__content { padding: 0 16px; text-align: center; }
  .hero-slider__actions { justify-content: center; }

  .resources-grid { grid-template-columns: 1fr; }
  .tools-grid { grid-template-columns: repeat(2, 1fr); }

  .footer-main__inner { grid-template-columns: 1fr; }

  .article-nav { flex-direction: column; }

  .firmware-info-card { padding: 20px 16px; }
  .firmware-actions { flex-direction: column; }
  .firmware-actions .btn--primary { width: 100%; justify-content: center; }

  /* 产品卡片单列 */
  .products-grid { grid-template-columns: 1fr; }
  .product-card { align-items: flex-start; }

  /* 固件区更紧凑 */
  .firmware-section { padding: 16px 12px; }
  .device-tab { padding: 7px 10px; font-size: 12px; }

  /* 资讯卡片 */
  .news-card__thumb { height: 140px; }

  .pagination__item a,
  .pagination__item span { min-width: 32px; height: 32px; font-size: 13px; }

  /* 移动端弹窗全宽 */
  .dl-modal { width: 96vw; padding: 20px 16px; }
  .dl-modal__option { padding: 12px; }
}

/* ====================================================================
   辅助工具类
   ==================================================================== */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  border: 0;
}

.text-truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.text-clamp-2 {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.text-clamp-3 {
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ====================================================================
   28. 教程侧边栏 (Sidebar Tutorial)
   ==================================================================== */

/* 教程类型导航 */
.tut-type-nav__list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.tut-type-nav__item + .tut-type-nav__item {
  border-top: 1px solid var(--c-border);
}
.tut-type-nav__link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  color: var(--c-text-secondary);
  text-decoration: none;
  font-size: 14px;
  transition: background .2s, color .2s;
  border-radius: 6px;
}
.tut-type-nav__link:hover,
.tut-type-nav__item.is-active .tut-type-nav__link {
  background: var(--c-primary-light);
  color: var(--c-primary);
}
.tut-type-nav__icon {
  flex-shrink: 0;
  width: 20px;
  color: inherit;
  display: flex;
  align-items: center;
}
.tut-type-nav__name {
  flex: 1;
}
.tut-type-nav__count {
  font-size: 12px;
  color: var(--c-text-muted);
  background: var(--c-bg-secondary);
  padding: 1px 7px;
  border-radius: 10px;
  flex-shrink: 0;
}
.tut-type-nav__item.is-active .tut-type-nav__count {
  background: var(--c-primary);
  color: white;
}

/* 难度筛选 */
.difficulty-filter {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.difficulty-filter__item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: var(--c-bg-secondary);
  border-radius: 8px;
  text-decoration: none;
  color: var(--c-text-secondary);
  font-size: 14px;
  transition: all .2s;
  border: 1px solid transparent;
}
.difficulty-filter__item:hover {
  border-color: var(--c-primary);
  color: var(--c-primary);
  background: var(--c-primary-light);
}
.difficulty-filter__stars {
  font-style: normal;
  letter-spacing: -2px;
}
.difficulty-filter__label {
  flex: 1;
  font-weight: 500;
}
.difficulty-filter__count {
  font-size: 12px;
  color: var(--c-text-muted);
}

/* 热门教程排行 */
.hot-tutorials-list {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: rank;
}
.hot-tutorials-list__item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 10px 0;
  border-bottom: 1px solid var(--c-border);
}
.hot-tutorials-list__item:last-child {
  border-bottom: none;
}
.hot-tutorials-list__rank {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  border-radius: 4px;
  background: var(--c-bg-secondary);
  color: var(--c-text-muted);
  font-size: 12px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 2px;
}
.hot-tutorials-list__item.is-top3 .hot-tutorials-list__rank--1 {
  background: #ff4d4f; color: white;
}
.hot-tutorials-list__item.is-top3 .hot-tutorials-list__rank--2 {
  background: #fa8c16; color: white;
}
.hot-tutorials-list__item.is-top3 .hot-tutorials-list__rank--3 {
  background: #fadb14; color: white;
}
.hot-tutorials-list__content {
  flex: 1;
  min-width: 0;
}
.hot-tutorials-list__title {
  display: block;
  font-size: 13px;
  line-height: 1.5;
  color: var(--c-text-primary);
  text-decoration: none;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  margin-bottom: 4px;
}
.hot-tutorials-list__title:hover {
  color: var(--c-primary);
}
.hot-tutorials-list__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  align-items: center;
}
.hot-tutorials-list__tag,
.hot-tutorials-list__difficulty {
  font-size: 11px;
  padding: 1px 6px;
  border-radius: 3px;
  background: var(--c-bg-secondary);
  color: var(--c-text-muted);
}
.hot-tutorials-list__difficulty--beginner     { background: #f0fff4; color: #52c41a; }
.hot-tutorials-list__difficulty--intermediate { background: #fff7e6; color: #fa8c16; }
.hot-tutorials-list__difficulty--advanced     { background: #fff1f0; color: #ff4d4f; }
.hot-tutorials-list__views {
  font-size: 11px;
  color: var(--c-text-muted);
  display: flex;
  align-items: center;
  gap: 2px;
}

/* 工具卡片 */
.tool-cards {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.tool-card {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px;
  background: var(--c-bg-secondary);
  border-radius: 8px;
  transition: box-shadow .2s;
}
.tool-card:hover {
  box-shadow: var(--shadow-sm);
}
.tool-card--featured {
  border: 1px solid var(--c-primary-light);
  background: var(--c-primary-light);
}
.tool-card__icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  border-radius: 10px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  background: white;
}
.tool-card__icon img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.tool-card__icon--placeholder {
  background: var(--c-primary-light);
}
.tool-card__info {
  flex: 1;
  min-width: 0;
}
.tool-card__name {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--c-text-primary);
  text-decoration: none;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.tool-card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: 3px;
}
.tool-card__version,
.tool-card__size,
.tool-card__req {
  font-size: 11px;
  color: var(--c-text-muted);
}
.tool-card__btn {
  flex-shrink: 0;
}

/* ====================================================================
   29. 设备分类归档页 (Taxonomy Device)
   ==================================================================== */

.device-header {
  background: white;
  border-radius: 12px;
  padding: 32px;
  margin-bottom: 28px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--c-border);
}
.device-header__inner {
  display: flex;
  gap: 32px;
  align-items: flex-start;
}
.device-header__image-wrap {
  flex-shrink: 0;
  width: 120px;
  text-align: center;
}
.device-header__image {
  width: 120px;
  height: auto;
  object-fit: contain;
  filter: drop-shadow(0 4px 12px rgba(0,0,0,.12));
}
.device-header__info {
  flex: 1;
}
.device-header__title {
  font-size: 26px;
  font-weight: 700;
  color: var(--c-text-primary);
  margin: 0 0 8px;
  line-height: 1.3;
}
.device-header__desc {
  color: var(--c-text-secondary);
  font-size: 15px;
  line-height: 1.7;
  margin: 0 0 16px;
}
.device-specs {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 6px 24px;
  margin: 0 0 16px;
}
.device-specs__row {
  display: flex;
  gap: 8px;
  font-size: 13px;
}
.device-specs__label {
  color: var(--c-text-muted);
  flex-shrink: 0;
  min-width: 80px;
}
.device-specs__value {
  color: var(--c-text-secondary);
  font-weight: 500;
}
.device-header__stat {
  font-size: 13px;
  color: var(--c-text-muted);
}
.device-header__count strong {
  color: var(--c-primary);
  font-weight: 700;
}

/* 固件章节头 */
.firmware-section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 16px;
}
.firmware-section-header__title {
  font-size: 18px;
  font-weight: 600;
  color: var(--c-text-primary);
  margin: 0;
}

/* 子分类机型网格 */
.device-children-section {
  margin-top: 40px;
}
.device-children-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 16px;
}
.device-child-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 16px 8px;
  background: white;
  border-radius: 10px;
  border: 1px solid var(--c-border);
  text-decoration: none;
  transition: all .2s;
  text-align: center;
}
.device-child-card:hover {
  border-color: var(--c-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.device-child-card__img-wrap {
  width: 60px;
  height: 75px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.device-child-card__img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.device-child-card__name {
  font-size: 13px;
  font-weight: 500;
  color: var(--c-text-primary);
  line-height: 1.4;
}
.device-child-card__count {
  font-size: 11px;
  color: var(--c-text-muted);
}

/* 空固件提示 */
.firmware-empty {
  text-align: center;
  padding: 60px 20px;
  color: var(--c-text-muted);
}
.firmware-empty__icon {
  margin: 0 auto 16px;
  display: block;
}
.firmware-empty__text {
  font-size: 16px;
  color: var(--c-text-secondary);
  margin: 0 0 8px;
}
.firmware-empty__sub {
  font-size: 14px;
  margin: 0;
}
.firmware-empty__sub a {
  color: var(--c-primary);
}

/* ====================================================================
   30. 教程分类归档页 (Taxonomy Tutorial Type)
   ==================================================================== */

.taxonomy-tutorial-layout {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 24px;
  align-items: start;
}
.taxonomy-tutorial-layout__main {
  min-width: 0;
}

/* 分类头部 */
.term-header {
  display: flex;
  gap: 20px;
  align-items: flex-start;
  background: white;
  border-radius: 12px;
  padding: 28px;
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--c-border);
}
.term-header__icon {
  flex-shrink: 0;
  width: 72px;
  height: 72px;
  background: var(--c-primary-light);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.term-header__content {
  flex: 1;
}
.term-header__title {
  font-size: 24px;
  font-weight: 700;
  color: var(--c-text-primary);
  margin: 0 0 8px;
}
.term-header__desc {
  font-size: 14px;
  color: var(--c-text-secondary);
  line-height: 1.7;
  margin: 0 0 10px;
}
.term-header__count {
  font-size: 13px;
  color: var(--c-text-muted);
}
.term-header__count strong {
  color: var(--c-primary);
  font-weight: 700;
}

/* 难度筛选条 */
.tut-filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
  padding: 16px;
  background: var(--c-bg-secondary);
  border-radius: 8px;
}
.tut-filter-bar__btn {
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 13px;
  color: var(--c-text-secondary);
  text-decoration: none;
  background: white;
  border: 1px solid var(--c-border);
  transition: all .2s;
  font-weight: 500;
}
.tut-filter-bar__btn:hover,
.tut-filter-bar__btn.is-active {
  background: var(--c-primary);
  color: white;
  border-color: var(--c-primary);
}

/* 教程卡片网格 */
.tutorial-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
  margin-bottom: 32px;
}
.tutorial-card {
  background: white;
  border-radius: 10px;
  border: 1px solid var(--c-border);
  overflow: hidden;
  transition: box-shadow .2s, transform .2s;
  position: relative;
}
.tutorial-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.tutorial-card__thumb-link {
  display: block;
}
.tutorial-card__thumb {
  width: 100%;
  height: 180px;
  object-fit: cover;
  display: block;
}
/* 无封面图时的默认占位（logo + 渐变背景） */
.tutorial-card__thumb--default {
  height: 180px;
  background: linear-gradient(135deg, #f0f5ff 0%, #e6f4ff 50%, #d6e8ff 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
}
.tutorial-card__thumb--default svg {
  width: 48px; height: 48px;
}
.tutorial-card__thumb--default span {
  font-size: 13px; font-weight: 500;
  color: rgba(22,119,255,.45);
}
.tutorial-card__body {
  padding: 16px;
}
.tutorial-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 10px;
}
.tutorial-card__title {
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
  margin: 0 0 8px;
}
.tutorial-card__title-link {
  color: var(--c-text-primary);
  text-decoration: none;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.tutorial-card__title-link:hover {
  color: var(--c-primary);
}
.tutorial-card__excerpt {
  font-size: 13px;
  color: var(--c-text-secondary);
  line-height: 1.6;
  margin: 0 0 12px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.tutorial-card__footer {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  padding-top: 10px;
  border-top: 1px solid var(--c-border);
}
.tutorial-card__meta {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  color: var(--c-text-muted);
}
/* 整体可点击遮罩 */
.tutorial-card__overlay-link {
  position: absolute;
  inset: 0;
  z-index: 1;
}
/* 内部可交互元素浮于遮罩之上 */
.tutorial-card__title-link,
.tutorial-card__thumb-link {
  position: relative;
  z-index: 2;
}

/* 空教程提示 */
.tutorial-empty {
  text-align: center;
  padding: 80px 20px;
  color: var(--c-text-muted);
}
.tutorial-empty__icon {
  margin: 0 auto 20px;
  display: block;
}
.tutorial-empty__title {
  font-size: 18px;
  color: var(--c-text-secondary);
  margin: 0 0 10px;
  font-weight: 500;
}
.tutorial-empty__sub {
  font-size: 14px;
  margin: 0;
}
.tutorial-empty__sub a {
  color: var(--c-primary);
}

/* 响应式：教程分类页 */
@media (max-width: 1024px) {
  .taxonomy-tutorial-layout {
    grid-template-columns: 1fr;
  }
  .device-header__inner {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
  .device-specs {
    grid-template-columns: 1fr;
  }
}
@media (max-width: 768px) {
  .tutorial-grid {
    grid-template-columns: 1fr;
  }
  .device-children-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .term-header {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
}