/* ===================================================================
   钉钉官网 · 丝绸折扇与左右分屏视觉设计系统 (Silk Fan Split System)
   风格：丝绸折扇·留白大字
   骨架：左右分屏
   配色：主色檀褐 #6B3A2A ｜ 辅色米色 #F2E6D4 ｜ 点缀靛蓝 #2A6F8F
   背景：扇面放射细褶与丝绸光泽·留白大字
   字体：仓耳渔阳体 + Barlow
   =================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Barlow:ital,wght@0,400;0,500;0,600;0,700;1,400&family=LXGW+WenKai&display=swap');

:root {
  --primary-tan: #6B3A2A;          /* 主色檀褐 */
  --primary-tan-dark: #4F281C;     /* 深檀褐 */
  --primary-tan-soft: rgba(107, 58, 42, 0.08);

  --secondary-beige: #F2E6D4;      /* 辅色米色 */
  --secondary-beige-light: #FBF7F0;/* 极浅米色 */
  --secondary-beige-soft: rgba(242, 230, 212, 0.45);

  --accent-indigo: #2A6F8F;        /* 点缀靛蓝 */
  --accent-indigo-light: #388AAE;
  --accent-indigo-soft: rgba(42, 111, 143, 0.12);

  --bg-silk-white: #FFFFFF;
  --bg-silk-light-gray: #F5F4F0;   /* 规范要求浅灰底 */
  --bg-silk-border: #E5DFD5;
  --border-btn-gray: #DCD7CE;      /* 1px 浅灰边 */

  --text-main: #2C2623;            /* 炭褐深墨字 */
  --text-muted: #615852;
  --text-subtle: #8F857D;

  --font-display: 'Barlow', 'PingFang SC', 'Hiragino Sans GB', 'LXGW WenKai', 'Microsoft YaHei', serif;
  --font-mono: 'Barlow', Consolas, Monaco, monospace;

  --shadow-subtle: 0 1px 3px rgba(0, 0, 0, 0.05); /* 很轻的阴影 */
  --shadow-card: 0 8px 24px rgba(107, 58, 42, 0.06);
  --shadow-split: 0 16px 36px rgba(79, 40, 28, 0.08);

  --radius-btn: 4px;      /* 按钮 4px 圆角 */
  --radius-tab: 8px;      /* 页签 8px 圆角 */
  --radius-img: 8px;      /* 配图 8px 圆角 */
  --radius-card: 10px;
}

/* 全局重置与基础规范 */
*, *::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-display);
  background-color: var(--bg-silk-white);
  color: var(--text-main);
  line-height: 1.65;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

/* -------------------------------------------------------------
   背景：扇面放射细褶与丝绸光泽·留白大字
   ------------------------------------------------------------- */
.silkfan-canvas-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: -1;
  background-color: #FAF8F5;
  background-image:
    /* 扇面放射细褶微弱线条：模拟折扇骨架展开与放射光束 */
    repeating-conic-gradient(
      from 270deg at 50% 115%,
      transparent 0deg,
      transparent 2.8deg,
      rgba(107, 58, 42, 0.025) 2.9deg,
      rgba(242, 230, 212, 0.06) 3deg,
      transparent 3.2deg
    ),
    /* 丝绸顺滑光泽纵向微弱经纬 */
    linear-gradient(to bottom, transparent 0px, transparent 35px, rgba(242, 230, 212, 0.35) 36px, transparent 37px),
    /* 柔和米色与靛蓝光晕 */
    radial-gradient(circle at 15% 20%, rgba(242, 230, 212, 0.65) 0%, transparent 45%),
    radial-gradient(circle at 85% 40%, rgba(42, 111, 143, 0.05) 0%, transparent 40%),
    radial-gradient(circle at 50% 90%, rgba(107, 58, 42, 0.03) 0%, transparent 60%);
  background-size: 100% 100%, 100% 37px, 100% 100%, 100% 100%, 100% 100%;
  opacity: 0.98;
}

/* 扇骨侧边折线指示印记 (装饰性) */
.silkfan-rib-track {
  position: fixed;
  right: 18px;
  top: 20%;
  bottom: 20%;
  width: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: flex-end;
  pointer-events: none;
  z-index: 1;
  opacity: 0.35;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-subtle);
}

.silkfan-rib-track span::after {
  content: "";
  display: inline-block;
  width: 10px;
  height: 1px;
  background-color: var(--primary-tan);
  margin-left: 4px;
  vertical-align: middle;
}

/* 容器基础定义 (左右边距手机至少 16px) */
.silk-container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

@media (max-width: 768px) {
  .silk-container {
    padding: 0 16px; /* 规范严格保证：手机至少 16px */
  }
}

/* -------------------------------------------------------------
   1. 页面最上方只放一张字标图，宽而矮，说明这是什么产品
   ------------------------------------------------------------- */
.silk-top-wordmark-bar {
  width: 100%;
  padding: 12px 0;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--bg-silk-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.silk-wordmark-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* 宽而矮的产品字标区 */
.silk-wordmark-wrapper {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  gap: 12px;
}

.silk-wordmark-img {
  height: 28px;
  width: auto;
  max-width: 160px;
  object-fit: contain;
  display: block;
}

.silk-wordmark-desc {
  font-size: 13px;
  color: var(--primary-tan);
  padding-left: 10px;
  border-left: 1px solid var(--bg-silk-border);
  letter-spacing: 0.5px;
  font-weight: 600;
}

/* 站内纯内链快速导航 */
.silk-nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
  list-style: none;
}

.silk-nav-link {
  font-size: 14px;
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s ease;
  position: relative;
}

.silk-nav-link:hover,
.silk-nav-link.active {
  color: var(--primary-tan);
  font-weight: 700;
}

.silk-nav-link.active::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--primary-tan);
  border-radius: 2px;
}

/* -------------------------------------------------------------
   控件标准规范 (Controls Specification)
   - 按钮白底、1px 浅灰边、4px 圆角、很轻的阴影
   - 页签选中底色用 rgba(142,142,142,.16)，圆角 8px
   ------------------------------------------------------------- */
.silk-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background-color: #FFFFFF;              /* 白底 */
  border: 1px solid var(--border-btn-gray);/* 1px 浅灰边 */
  border-radius: var(--radius-btn);         /* 4px 圆角 */
  box-shadow: var(--shadow-subtle);          /* 很轻的阴影 */
  color: var(--primary-tan);
  font-size: 14px;
  font-weight: 600;
  padding: 10px 22px;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  outline: none;
  user-select: none;
  font-family: inherit;
}

.silk-btn:hover {
  background-color: #FDFBF8;
  border-color: #C8BFB3;
  box-shadow: 0 3px 8px rgba(0, 0, 0, 0.07);
  transform: translateY(-1px);
}

.silk-btn:active {
  transform: translateY(0);
  box-shadow: var(--shadow-subtle);
}

/* 强调型按钮：在白底与浅灰边基础上突显雅致檀褐与米色底纹 */
.silk-btn-primary {
  color: var(--primary-tan-dark);
  font-weight: 700;
  border-color: #CDC3B6;
  background: linear-gradient(180deg, #FFFFFF 0%, #F9F5EE 100%);
}

.silk-btn-indigo {
  color: var(--accent-indigo);
  border-color: rgba(42, 111, 143, 0.3);
  background: #FFFFFF;
}

.silk-btn-indigo:hover {
  border-color: var(--accent-indigo);
  color: var(--accent-indigo-light);
}

/* -------------------------------------------------------------
   独立小方块快捷键提示规范 (KBD Keycaps)
   例如 Ctrl Shift 1
   ------------------------------------------------------------- */
.kbd-box {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 26px;
  height: 24px;
  padding: 0 7px;
  margin: 0 3px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--primary-tan-dark);
  background-color: #FFFFFF;
  border: 1px solid #D6CEC3;
  border-bottom: 2px solid #ABA092;
  border-radius: 4px;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.08);
  line-height: 1;
}

/* -------------------------------------------------------------
   骨架：左右分屏 (Left-Right Split Screen)
   首屏数据主张 ➔ 16:9产品画面 ➔ 快捷键独立小方块
   ------------------------------------------------------------- */
.silk-split-hero-section {
  padding: 40px 0 50px;
}

.silk-split-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}

.silk-split-left-pane {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  text-align: left;
}

.silk-fan-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background-color: var(--secondary-beige-soft);
  border: 1px solid rgba(107, 58, 42, 0.18);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 13px;
  color: var(--primary-tan);
  font-weight: 600;
  margin-bottom: 16px;
}

.silk-badge-dot {
  width: 7px;
  height: 7px;
  background-color: var(--accent-indigo);
  border-radius: 50%;
  display: inline-block;
}

/* 唯一语义化 H1 严格指定标题 */
.silk-hero-h1 {
  font-size: 38px;
  font-weight: 800;
  color: var(--primary-tan);
  letter-spacing: -0.5px;
  line-height: 1.25;
  margin-bottom: 16px;
}

.silk-hero-sub {
  font-size: 16px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 24px;
}

/* 骨架流向要求：首屏数据主张 (Metric Prop Cards) */
.silk-data-assertion-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  width: 100%;
  margin-bottom: 28px;
  padding: 16px;
  background: #FFFFFF;
  border: 1px solid var(--bg-silk-border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-subtle);
}

.silk-data-card {
  border-right: 1px solid var(--bg-silk-border);
  padding-right: 10px;
}

.silk-data-card:last-child {
  border-right: none;
  padding-right: 0;
}

.silk-data-num {
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 800;
  color: var(--primary-tan);
  line-height: 1.1;
  display: block;
}

.silk-data-num span {
  font-size: 13px;
  font-weight: 600;
  color: var(--accent-indigo);
}

.silk-data-label {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 4px;
  display: block;
}

.silk-hero-btn-group {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}

/* 右分屏：16:9 产品画面容器（优先短视频，无视频用完整工作台截图） */
.silk-split-right-pane {
  position: relative;
  width: 100%;
}

.silk-workspace-16x9-wrapper {
  position: relative;
  width: 100%;
  border-radius: 10px;
  border: 1px solid var(--bg-silk-border);
  background: #FFFFFF;
  box-shadow: var(--shadow-split);
  overflow: hidden;
}

.silk-16x9-aspect-box {
  position: relative;
  width: 100%;
  padding-top: 56.25%; /* 16:9 比例 */
  background-color: #EFECE6;
}

.silk-workspace-asset {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* 画面上叠一行操作提示，把快捷键拆成独立小方块，例如 Ctrl Shift 1 */
.silk-workspace-prompt-overlay {
  position: absolute;
  bottom: 14px;
  left: 50%;
  transform: translateX(-50%);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  padding: 8px 16px;
  border-radius: 30px;
  border: 1px solid rgba(107, 58, 42, 0.16);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
  font-size: 12px;
  color: var(--text-main);
  white-space: nowrap;
  z-index: 5;
}

.silk-prompt-label {
  font-weight: 700;
  color: var(--primary-tan);
}

/* -------------------------------------------------------------
   骨架流向：再双图亮点 (Left-Right Split Twin Highlights)
   ------------------------------------------------------------- */
.silk-twin-highlights-section {
  padding: 40px 0 60px;
}

.silk-section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 40px;
}

.silk-section-tag {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--accent-indigo);
  letter-spacing: 2px;
  text-transform: uppercase;
  display: block;
  margin-bottom: 8px;
}

.silk-section-title {
  font-size: 32px;
  font-weight: 800;
  color: var(--primary-tan);
  letter-spacing: -0.3px;
  line-height: 1.3;
  margin-bottom: 12px;
}

.silk-section-desc {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.6;
}

.silk-twin-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.silk-twin-card {
  background: #FFFFFF;
  border: 1px solid var(--bg-silk-border);
  border-radius: var(--radius-card);
  padding: 30px;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.25s ease;
}

.silk-twin-card:hover {
  transform: translateY(-3px);
  border-color: var(--primary-tan);
}

.silk-twin-badge {
  display: inline-block;
  background-color: var(--secondary-beige);
  color: var(--primary-tan-dark);
  font-size: 12px;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 4px;
  margin-bottom: 12px;
}

.silk-twin-h3 {
  font-size: 22px;
  font-weight: 800;
  color: var(--primary-tan);
  margin-bottom: 10px;
}

.silk-twin-p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 18px;
}

.silk-twin-img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  border-radius: 6px;
  border: 1px solid var(--bg-silk-border);
}

/* -------------------------------------------------------------
   骨架流向：再手风琴能力 (Accordion Capabilities)
   ------------------------------------------------------------- */
.silk-accordion-section {
  padding: 50px 0 60px;
  background: linear-gradient(180deg, transparent 0%, rgba(242, 230, 212, 0.25) 50%, transparent 100%);
}

.silk-accordion-container {
  max-width: 860px;
  margin: 0 auto;
}

.silk-accordion-item {
  background: #FFFFFF;
  border: 1px solid var(--bg-silk-border);
  border-radius: var(--radius-card);
  margin-bottom: 14px;
  overflow: hidden;
  box-shadow: var(--shadow-subtle);
  transition: border-color 0.2s ease;
}

.silk-accordion-item.active {
  border-color: var(--primary-tan);
}

.silk-accordion-header {
  width: 100%;
  padding: 18px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: transparent;
  border: none;
  cursor: pointer;
  text-align: left;
  font-family: inherit;
  font-size: 17px;
  font-weight: 700;
  color: var(--primary-tan);
}

.silk-accordion-icon {
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--accent-indigo);
  transition: transform 0.25s ease;
}

.silk-accordion-item.active .silk-accordion-icon {
  transform: rotate(45deg);
}

.silk-accordion-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease-out, padding 0.3s ease;
  padding: 0 24px;
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.65;
}

.silk-accordion-item.active .silk-accordion-body {
  max-height: 200px;
  padding-bottom: 20px;
}

/* -------------------------------------------------------------
   骨架流向：再安全认证 (Security Certification Strip)
   ------------------------------------------------------------- */
.silk-security-section {
  padding: 40px 0 60px;
}

.silk-security-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.silk-security-card {
  background: #FFFFFF;
  border: 1px solid var(--bg-silk-border);
  border-radius: var(--radius-card);
  padding: 22px 18px;
  text-align: center;
  box-shadow: var(--shadow-subtle);
}

.silk-security-badge-icon {
  width: 38px;
  height: 38px;
  margin: 0 auto 12px;
  background-color: var(--secondary-beige-soft);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-tan);
  font-weight: 800;
  font-family: var(--font-mono);
  font-size: 14px;
}

.silk-security-name {
  font-size: 15px;
  font-weight: 700;
  color: var(--primary-tan);
  margin-bottom: 6px;
}

.silk-security-desc {
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.5;
}

/* -------------------------------------------------------------
   2. 场景切换规范
   浅灰底。上面是图片标题，下面三个页签横排居中：场景 A、场景 B、场景 C。
   每项只有一个名称和一句说明。
   桌面端约每 3 秒自动切换，当前项用浅灰圆角底。配图宽 800px、圆角 8px。
   手机改成横向滑动，底部放小圆点。
   控件规范：页签选中底色用 rgba(142,142,142,.16)，圆角 8px。
   ------------------------------------------------------------- */
.silk-scene-switch-section {
  background-color: var(--bg-silk-light-gray); /* 浅灰底 */
  padding: 60px 0;
  border-top: 1px solid var(--bg-silk-border);
  border-bottom: 1px solid var(--bg-silk-border);
}

.silk-scene-header-box {
  text-align: center;
  margin-bottom: 24px;
}

/* 上面是图片标题 */
.silk-scene-pic-title {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 26px;
  font-weight: 800;
  color: var(--primary-tan);
  margin-bottom: 6px;
}

.silk-scene-pic-sub {
  font-size: 15px;
  color: var(--text-muted);
}

/* 下面三个页签横排居中：场景 A、场景 B、场景 C */
.silk-scene-tabs-container {
  display: flex;
  justify-content: center;
  align-items: stretch;
  gap: 16px;
  max-width: 860px;
  margin: 0 auto 30px;
}

/* 页签：每项只有一个名称和一句说明 */
.silk-scene-tab-item {
  flex: 1;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-tab); /* 8px 圆角 */
  padding: 14px 18px;
  cursor: pointer;
  text-align: left;
  transition: all 0.25s ease;
  outline: none;
  font-family: inherit;
}

/* 当前项用浅灰圆角底：rgba(142,142,142,.16)，圆角 8px */
.silk-scene-tab-item.active {
  background-color: rgba(142, 142, 142, 0.16); /* 严格规范要求 */
  border-color: rgba(142, 142, 142, 0.28);
}

.silk-scene-tab-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--primary-tan);
  margin-bottom: 4px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.silk-scene-tab-desc {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.4;
}

/* 配图宽 800px、圆角 8px */
.silk-scene-display-wrapper {
  max-width: 800px; /* 严格 800px 宽 */
  margin: 0 auto;
  position: relative;
}

.silk-scene-img-holder {
  width: 100%;
  max-width: 800px;
  height: 450px;
  border-radius: var(--radius-img); /* 8px 圆角 */
  overflow: hidden;
  box-shadow: var(--shadow-split);
  border: 1px solid var(--bg-silk-border);
  background-color: #EAE6DF;
  position: relative;
}

.silk-scene-panel-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: none;
  border-radius: var(--radius-img);
}

.silk-scene-panel-img.active {
  display: block;
  animation: silkFadeIn 0.35s ease forwards;
}

@keyframes silkFadeIn {
  from { opacity: 0; transform: scale(0.99); }
  to { opacity: 1; transform: scale(1); }
}

/* 手机改成横向滑动，底部放小圆点 */
.silk-scene-dots-track {
  display: none;
  justify-content: center;
  align-items: center;
  gap: 8px;
  margin-top: 16px;
}

.silk-scene-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(142, 142, 142, 0.35);
  transition: all 0.2s ease;
  cursor: pointer;
}

.silk-scene-dot.active {
  width: 24px;
  border-radius: 4px;
  background: var(--primary-tan);
}

/* -------------------------------------------------------------
   3. 能力段，重复三次规范
   三块结构相同，竖向居中，块与块之间留白约 72px，手机收成约 40px。
   - 图片标题，高度约 36px
   - 一行说明，桌面 20px 横排，手机改为左对齐竖排
   - 一张 800px 宽、圆角 8px 的界面图
   - 三块底色按白、浅灰、白交替。
   第一块讲存储或资料，第二块讲助手或自动化，第三块讲会议或跨端办公。
   ------------------------------------------------------------- */
.silk-capability-block {
  padding: 60px 0;
  display: flex;
  justify-content: center;
  align-items: center;
}

/* 块与块之间留白约 72px */
.silk-capability-block + .silk-capability-block {
  margin-top: 72px;
}

/* 三块底色按白、浅灰、白交替 */
.silk-cap-bg-white {
  background-color: var(--bg-silk-white); /* 白 */
}

.silk-cap-bg-lightgray {
  background-color: var(--bg-silk-light-gray); /* 浅灰 */
  border-top: 1px solid var(--bg-silk-border);
  border-bottom: 1px solid var(--bg-silk-border);
}

.silk-cap-inner-wrap {
  width: 100%;
  max-width: 800px; /* 居中与 800px 对齐 */
  margin: 0 auto;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* 图片标题，高度约 36px */
.silk-cap-img-title-wrapper {
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 12px;
}

.silk-cap-img-title {
  height: 36px;
  max-height: 36px;
  width: auto;
  object-fit: contain;
  display: inline-block;
}

/* 一行说明，桌面 20px 横排，手机改为左对齐竖排 */
.silk-cap-desc-row {
  font-size: 20px;
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 24px;
  white-space: nowrap;
  font-weight: 500;
  display: block;
}

/* 一张 800px 宽、圆角 8px 的界面图 */
.silk-cap-figure-wrapper {
  width: 100%;
  max-width: 800px;
  border-radius: var(--radius-img); /* 8px 圆角 */
  overflow: hidden;
  box-shadow: var(--shadow-split);
  border: 1px solid var(--bg-silk-border);
  background-color: #EAE6DE;
}

.silk-cap-800-img {
  width: 100%;
  max-width: 800px;
  height: 450px;
  object-fit: cover;
  display: block;
  border-radius: var(--radius-img);
}

/* -------------------------------------------------------------
   4. 收尾行动规范
   一张短句图片，例如「还在等什么」。下面一个向下的小箭头，
   再放两个按钮：主按钮「立即体验」，次按钮「注册后体验」。
   邀请码、协议确认放在弹层里，不占主滚动流。
   ------------------------------------------------------------- */
.silk-action-section {
  padding: 80px 0 70px;
  text-align: center;
  background: radial-gradient(circle at 50% 50%, rgba(242, 230, 212, 0.5) 0%, transparent 70%);
}

.silk-action-inner {
  max-width: 640px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* 一张短句图片，例如「还在等什么」 */
.silk-action-catchphrase-img {
  height: 48px;
  max-height: 52px;
  width: auto;
  object-fit: contain;
  margin-bottom: 18px;
}

.silk-action-slogan-alt {
  font-size: 32px;
  font-weight: 800;
  color: var(--primary-tan);
  letter-spacing: -0.5px;
  margin-bottom: 8px;
}

/* 下面一个向下的小箭头 */
.silk-action-down-arrow {
  width: 24px;
  height: 24px;
  margin: 6px 0 24px;
  color: var(--accent-indigo);
  animation: silkBounceDown 1.8s infinite ease-in-out;
}

@keyframes silkBounceDown {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(6px); }
}

/* 再放两个按钮：主按钮「立即体验」，次按钮「注册后体验」 */
.silk-action-btn-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 18px;
  flex-wrap: wrap;
}

.silk-action-btn-main {
  min-width: 140px;
  height: 42px;
  font-size: 15px;
}

.silk-action-btn-sub {
  min-width: 140px;
  height: 42px;
  font-size: 15px;
  color: var(--text-muted);
}

.silk-action-note {
  font-size: 13px;
  color: var(--text-subtle);
}

.silk-modal-trigger-link {
  color: var(--accent-indigo);
  text-decoration: underline;
  cursor: pointer;
  background: none;
  border: none;
  font: inherit;
  padding: 0;
}

/* -------------------------------------------------------------
   弹层规范 (Modal: 邀请码、协议确认，不占主滚动流)
   ------------------------------------------------------------- */
.silk-modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(79, 40, 28, 0.6);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  z-index: 9999;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.silk-modal-overlay.open {
  display: flex;
  animation: silkModalFade 0.25s ease-out forwards;
}

@keyframes silkModalFade {
  from { opacity: 0; transform: scale(0.96); }
  to { opacity: 1; transform: scale(1); }
}

.silk-modal-window {
  background: #FFFFFF;
  border: 1px solid var(--bg-silk-border);
  border-radius: 12px;
  max-width: 480px;
  width: 100%;
  padding: 30px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.25);
  position: relative;
}

.silk-modal-close-btn {
  position: absolute;
  top: 18px;
  right: 18px;
  background: transparent;
  border: none;
  font-size: 22px;
  line-height: 1;
  color: var(--text-subtle);
  cursor: pointer;
}

.silk-modal-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--primary-tan);
  margin-bottom: 12px;
}

.silk-modal-body {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 20px;
}

.silk-modal-form-group {
  margin-bottom: 16px;
  text-align: left;
}

.silk-modal-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 6px;
}

.silk-modal-input {
  width: 100%;
  height: 40px;
  padding: 0 12px;
  border: 1px solid var(--bg-silk-border);
  border-radius: 4px;
  font-size: 14px;
  font-family: inherit;
  outline: none;
}

.silk-modal-input:focus {
  border-color: var(--primary-tan);
}

.silk-modal-checkbox-row {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 20px;
  text-align: left;
}

.silk-modal-checkbox-row input {
  margin-top: 3px;
}

/* -------------------------------------------------------------
   骨架流向要求：底部场景条 (Scenario Ribbon)
   ------------------------------------------------------------- */
.silk-scenario-ribbon-section {
  padding: 40px 0 50px;
  border-top: 1px solid var(--bg-silk-border);
}

.silk-ribbon-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.silk-ribbon-card {
  background: #FFFFFF;
  border: 1px solid var(--bg-silk-border);
  border-radius: var(--radius-card);
  padding: 24px;
  box-shadow: var(--shadow-subtle);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.silk-ribbon-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  color: var(--accent-indigo);
  letter-spacing: 1.5px;
  margin-bottom: 6px;
  display: block;
}

.silk-ribbon-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--primary-tan);
  margin-bottom: 8px;
}

.silk-ribbon-desc {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 16px;
  line-height: 1.55;
}

/* -------------------------------------------------------------
   骨架流向要求：页脚三列 (Three-Column Footer)
   ------------------------------------------------------------- */
.silk-footer-three-section {
  padding: 50px 0 30px;
  border-top: 1px solid var(--bg-silk-border);
  background-color: #FAF8F5;
}

.silk-footer-three-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 36px;
  margin-bottom: 30px;
}

.silk-footer-col-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--primary-tan);
  margin-bottom: 16px;
  letter-spacing: 0.5px;
}

.silk-footer-link-list {
  list-style: none;
}

.silk-footer-link-item {
  margin-bottom: 10px;
}

.silk-footer-link {
  font-size: 13px;
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s ease;
}

.silk-footer-link:hover {
  color: var(--primary-tan);
  text-decoration: underline;
}

/* -------------------------------------------------------------
   5. 极简页脚规范
   一行低对比度信息。桌面横排，中间用 1px 竖线隔开：
   运营者、隐私政策、权限说明。手机改成竖排。
   ------------------------------------------------------------- */
.silk-footer-bottom-bar {
  border-top: 1px solid rgba(107, 58, 42, 0.08);
  padding: 18px 0;
  background-color: #F5F2EB;
}

.silk-footer-single-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  font-size: 13px;
  color: var(--text-subtle); /* 低对比度信息 */
}

.silk-footer-divider {
  display: inline-block;
  width: 1px;
  height: 12px;
  background-color: rgba(107, 58, 42, 0.2); /* 1px 竖线隔开 */
}

.silk-footer-bottom-link {
  color: var(--text-subtle);
  text-decoration: none;
}

.silk-footer-bottom-link:hover {
  color: var(--text-muted);
}

/* -------------------------------------------------------------
   响应式断点适配 (桌面 -> 平板 -> 手机)
   手机端规范要求：
   - 左右边距手机至少 16px
   - 场景配图手机改成横向滑动，底部放小圆点
   - 能力段块与块留白手机收成约 40px
   - 一行说明手机改为左对齐竖排
   - 极简页脚手机改成竖排
   ------------------------------------------------------------- */
@media (max-width: 992px) {
  .silk-split-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .silk-twin-grid {
    grid-template-columns: 1fr;
  }

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

  .silk-ribbon-grid {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 768px) {
  .silkfan-rib-track {
    display: none;
  }

  .silk-hero-h1 {
    font-size: 26px;
    line-height: 1.3;
  }

  .silk-hero-sub {
    font-size: 14px;
  }

  .silk-data-assertion-strip {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .silk-data-card {
    border-right: none;
    border-bottom: 1px solid var(--bg-silk-border);
    padding-bottom: 10px;
    padding-right: 0;
  }

  .silk-data-card:last-child {
    border-bottom: none;
    padding-bottom: 0;
  }

  .silk-security-grid {
    grid-template-columns: 1fr;
  }

  .silk-workspace-prompt-overlay {
    font-size: 11px;
    padding: 6px 12px;
    bottom: 8px;
  }

  .kbd-box {
    min-width: 22px;
    height: 20px;
    font-size: 10px;
    padding: 0 4px;
  }

  /* 场景切换：手机改成横向滑动，底部放小圆点 */
  .silk-scene-tabs-container {
    display: flex;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 8px;
    justify-content: flex-start;
  }

  .silk-scene-tab-item {
    min-width: 220px;
    flex-shrink: 0;
    scroll-snap-align: center;
  }

  .silk-scene-dots-track {
    display: flex;
  }

  .silk-scene-img-holder {
    height: 250px;
  }

  /* 能力段手机端适配：
     - 块与块之间留白手机收成约 40px
     - 一行说明手机改为左对齐竖排
  */
  .silk-capability-block {
    padding: 30px 0;
  }

  .silk-capability-block + .silk-capability-block {
    margin-top: 40px; /* 手机收成约 40px */
  }

  .silk-cap-desc-row {
    white-space: normal;
    text-align: left;
    align-self: flex-start;
    font-size: 15px;
    line-height: 1.6;
    margin-bottom: 16px;
    display: block; /* 手机改为左对齐竖排 */
  }

  .silk-cap-800-img {
    height: 230px;
  }

  /* 收尾行动 */
  .silk-action-slogan-alt {
    font-size: 24px;
  }

  .silk-action-btn-group {
    flex-direction: column;
    width: 100%;
  }

  .silk-action-btn-main,
  .silk-action-btn-sub {
    width: 100%;
  }

  /* 极简页脚：手机改成竖排 */
  .silk-footer-single-row {
    flex-direction: column; /* 手机改成竖排 */
    gap: 8px;
    text-align: center;
  }

  .silk-footer-divider {
    display: none; /* 竖排时隐藏 1px 竖线 */
  }
}