/* ==========================================================================
   一云梯机场 · 方案 A：云梯天境 · 沉浸式电影长卷 官方核心样式表
   项目代号: YYT-SKY-A01
   ========================================================================== */

:root {
  /* 品牌色彩系统 (严格遵循方案 A 规范) */
  --c-deep-space: #080F27;
  --c-midnight: #101B3C;
  --c-cloud-violet: #7566C8;
  --c-soft-violet: #A79AF4;
  --c-ice-white: #F2F5FF;
  --c-text-muted: #C5CEE6;
  --c-text-dim: #8E9BB8;
  --c-ladder-warm: #FFE6C4;
  --c-btn-highlight: #A99CFF;
  --c-btn-hover: #9382f8;
  
  /* 表面与玻璃拟态 */
  --glass-bg: rgba(16, 27, 60, 0.72);
  --glass-card: rgba(16, 27, 60, 0.85);
  --glass-border: rgba(167, 154, 244, 0.18);
  --glass-border-focus: rgba(255, 230, 196, 0.5);
  --glass-blur: blur(14px);
  --shadow-glow: 0 12px 36px rgba(117, 102, 200, 0.22);
  --shadow-card: 0 16px 40px rgba(8, 15, 39, 0.5);
  
  /* 空间间距 */
  --space-unit: 8px;
  --container-max: 1200px;
  --nav-height: 76px;
  --transition-smooth: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-full: 9999px;
}

/* 基础重置与无障碍保障 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-height) + 20px);
  background-color: var(--c-deep-space);
  color: var(--c-ice-white);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.68;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body {
  overflow-x: hidden;
  background-color: var(--c-deep-space);
  color: var(--c-text-muted);
  min-height: 100vh;
  position: relative;
}

/* 跳过内容导航 (无障碍) */
.skip-link {
  position: absolute;
  top: -60px;
  left: 20px;
  background: var(--c-btn-highlight);
  color: #080F27;
  font-weight: 700;
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  z-index: 10000;
  transition: top 0.2s ease;
  text-decoration: none;
}
.skip-link:focus {
  top: 16px;
  outline: 3px solid var(--c-ladder-warm);
}

/* 焦点可见性 */
:focus-visible {
  outline: 2px solid var(--c-ladder-warm);
  outline-offset: 3px;
}

/* 通用容器 */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* 通用排版 */
h1, h2, h3, h4, h5, h6 {
  color: var(--c-ice-white);
  font-weight: 700;
  line-height: 1.28;
}

a {
  color: var(--c-soft-violet);
  text-decoration: none;
  transition: var(--transition-smooth);
}
a:hover {
  color: var(--c-ladder-warm);
}

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

/* 按钮规范 (满足 44x44px 触摸要求) */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 48px;
  min-width: 130px;
  padding: 12px 28px;
  border-radius: var(--radius-full);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  transition: var(--transition-smooth);
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--c-btn-highlight) 0%, var(--c-cloud-violet) 100%);
  color: #080F27;
  font-weight: 700;
  box-shadow: 0 4px 20px rgba(169, 156, 255, 0.35);
}
.btn-primary:hover {
  background: linear-gradient(135deg, #b8abff 0%, #8272dc 100%);
  color: #050819;
  transform: translateY(-2px);
  box-shadow: 0 8px 26px rgba(169, 156, 255, 0.45);
}

.btn-secondary {
  background: rgba(16, 27, 60, 0.6);
  color: var(--c-ice-white);
  border: 1px solid var(--glass-border);
  backdrop-filter: var(--glass-blur);
}
.btn-secondary:hover {
  background: rgba(117, 102, 200, 0.2);
  border-color: var(--c-soft-violet);
  color: var(--c-ladder-warm);
  transform: translateY(-2px);
}

.btn-lg {
  min-height: 54px;
  padding: 14px 36px;
  font-size: 1.08rem;
}

/* 徽章 */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  background: rgba(117, 102, 200, 0.18);
  color: var(--c-ladder-warm);
  border: 1px solid rgba(167, 154, 244, 0.28);
  margin-bottom: 16px;
}

/* ==========================================================================
   模块 01：透明导航与云海入口
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--nav-height);
  z-index: 1000;
  transition: background-color 0.3s ease, backdrop-filter 0.3s ease, border-color 0.3s ease;
  border-bottom: 1px solid transparent;
}
.site-header.scrolled {
  background-color: rgba(8, 15, 39, 0.88);
  backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.35);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.brand-link {
  display: flex;
  align-items: center;
  height: 48px;
}
.brand-logo {
  height: 38px;
  width: auto;
}

.nav-menu {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 32px;
}
.nav-link {
  color: var(--c-ice-white);
  font-size: 0.96rem;
  font-weight: 500;
  padding: 8px 4px;
  position: relative;
}
.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--c-ladder-warm);
  transition: width 0.24s ease;
}
.nav-link:hover {
  color: var(--c-ladder-warm);
}
.nav-link:hover::after {
  width: 100%;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* 移动端菜单切换按钮 */
.menu-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  width: 44px;
  height: 44px;
  cursor: pointer;
  padding: 10px;
  color: var(--c-ice-white);
}
.menu-toggle svg {
  width: 24px;
  height: 24px;
  stroke: var(--c-ice-white);
}

/* ==========================================================================
   模块 02：全屏发光天梯 Hero
   ========================================================================== */
.hero-section {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding-top: var(--nav-height);
  padding-bottom: 60px;
  background-color: var(--c-deep-space);
}

.hero-bg-wrapper {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  pointer-events: none;
}
.hero-bg-art {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center bottom;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 650px;
}
.hero-title {
  font-size: clamp(2.5rem, 5.2vw, 4.2rem);
  font-weight: 800;
  color: var(--c-ice-white);
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin-bottom: 18px;
  text-shadow: 0 4px 20px rgba(8, 15, 39, 0.8);
}
.hero-title .glow-text {
  background: linear-gradient(135deg, #FFFFFF 20%, var(--c-ladder-warm) 70%, var(--c-soft-violet) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.hero-subtitle {
  font-size: clamp(1.2rem, 2.2vw, 1.6rem);
  font-weight: 600;
  color: var(--c-ladder-warm);
  margin-bottom: 18px;
  letter-spacing: 0.02em;
}

.hero-lead {
  font-size: 1.08rem;
  line-height: 1.75;
  color: var(--c-text-muted);
  margin-bottom: 36px;
  max-width: 580px;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.7);
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
}

.scroll-indicator {
  position: absolute;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  color: var(--c-text-dim);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  animation: floatDown 2.2s infinite ease-in-out;
}
.scroll-indicator svg {
  width: 20px;
  height: 20px;
  stroke: var(--c-ladder-warm);
}

@keyframes floatDown {
  0%, 100% { transform: translate(-50%, 0); opacity: 0.7; }
  50% { transform: translate(-50%, 8px); opacity: 1; }
}

/* ==========================================================================
   模块 03：穿越云层的品牌宣言
   ========================================================================== */
.manifesto-section {
  position: relative;
  padding: 100px 0;
  background-color: var(--c-deep-space);
  overflow: hidden;
  border-top: 1px solid rgba(117, 102, 200, 0.12);
  border-bottom: 1px solid rgba(117, 102, 200, 0.12);
}
.manifesto-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  opacity: 0.7;
  pointer-events: none;
}
.manifesto-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 860px;
  margin: 0 auto;
}
.manifesto-quote {
  font-size: clamp(1.4rem, 2.8vw, 2.1rem);
  font-weight: 600;
  color: var(--c-ice-white);
  line-height: 1.6;
  margin-bottom: 24px;
}
.manifesto-quote em {
  font-style: normal;
  color: var(--c-ladder-warm);
  border-bottom: 1px dashed rgba(255, 230, 196, 0.4);
}
.manifesto-desc {
  font-size: 1.05rem;
  color: var(--c-text-muted);
  line-height: 1.85;
}

/* ==========================================================================
   模块 04：雪山之巅的核心优势 (三章差异化大图文)
   ========================================================================== */
.advantages-section {
  padding: 110px 0;
  background-color: var(--c-deep-space);
  position: relative;
}
.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 64px auto;
}
.section-title {
  font-size: clamp(2rem, 3.8vw, 2.8rem);
  margin-bottom: 16px;
}
.section-subtitle {
  font-size: 1.08rem;
  color: var(--c-text-muted);
}

.story-chapter {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
  margin-bottom: 96px;
}
.story-chapter:last-child {
  margin-bottom: 0;
}
/* 第一章：左图右文 */
.story-chapter.ch-left-img .story-media { order: 1; }
.story-chapter.ch-left-img .story-text { order: 2; }

/* 第二章：全幅背景居中图文 */
.story-chapter.ch-full-width {
  grid-template-columns: 1fr;
  position: relative;
  padding: 72px 48px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--glass-card);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-card);
  text-align: center;
}
.story-chapter.ch-full-width .ch-full-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  opacity: 0.35;
  pointer-events: none;
}
.story-chapter.ch-full-width .story-text {
  position: relative;
  z-index: 2;
  max-width: 760px;
  margin: 0 auto;
}

/* 第三章：右图左文 */
.story-chapter.ch-right-img .story-text { order: 1; }
.story-chapter.ch-right-img .story-media { order: 2; }

.story-media {
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-glow);
  border: 1px solid var(--glass-border);
  background: var(--c-midnight);
}
.story-media img {
  width: 100%;
  height: auto;
  transition: transform 0.5s ease;
}
.story-media:hover img {
  transform: scale(1.02);
}

.chapter-badge {
  color: var(--c-ladder-warm);
  font-size: 0.86rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 12px;
  display: block;
}
.chapter-title {
  font-size: clamp(1.5rem, 2.4vw, 2rem);
  margin-bottom: 18px;
  color: var(--c-ice-white);
}
.chapter-desc {
  font-size: 1.02rem;
  line-height: 1.8;
  color: var(--c-text-muted);
  margin-bottom: 24px;
}
.feature-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.feature-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.98rem;
  color: var(--c-ice-white);
}
.feature-item svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  margin-top: 2px;
  stroke: var(--c-soft-violet);
}

/* ==========================================================================
   模块 05：高空平台展示与使用场景介绍
   ========================================================================== */
.platforms-section {
  padding: 80px 0;
  background: linear-gradient(180deg, var(--c-deep-space) 0%, var(--c-midnight) 50%, var(--c-deep-space) 100%);
  border-top: 1px solid rgba(117, 102, 200, 0.12);
  border-bottom: 1px solid rgba(117, 102, 200, 0.12);
}
.platform-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 20px;
  margin-top: 40px;
}
.platform-card {
  background: var(--glass-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: 28px 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  transition: var(--transition-smooth);
}
.platform-card:hover {
  transform: translateY(-4px);
  border-color: var(--c-soft-violet);
  box-shadow: 0 10px 24px rgba(117, 102, 200, 0.2);
}
.platform-icon-wrap {
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}
.platform-name {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--c-ice-white);
  margin-bottom: 6px;
}
.platform-tag {
  font-size: 0.82rem;
  color: var(--c-text-dim);
}
.platform-disclaimer {
  text-align: center;
  font-size: 0.85rem;
  color: var(--c-text-dim);
  margin-top: 32px;
}

/* ==========================================================================
   模块 06：多设备连接场景
   ========================================================================== */
.devices-section {
  padding: 100px 0;
  background-color: var(--c-deep-space);
}
.devices-display {
  margin: 48px auto 40px auto;
  max-width: 900px;
}
.device-tags-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 36px;
}
.device-tag-box {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  padding: 18px;
  text-align: center;
}
.device-os {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--c-ice-white);
  margin-bottom: 4px;
}
.device-sub {
  font-size: 0.84rem;
  color: var(--c-text-dim);
}

/* ==========================================================================
   模块 07：云端套餐方案 (独立深色卡片布局)
   ========================================================================== */
.pricing-section {
  padding: 110px 0;
  background-color: var(--c-deep-space);
  position: relative;
}
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 48px;
}
.price-card {
  background: var(--glass-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 36px 24px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition-smooth);
}
.price-card:hover {
  transform: translateY(-6px);
  border-color: var(--c-soft-violet);
  box-shadow: 0 16px 40px rgba(117, 102, 200, 0.25);
}
.price-card.featured {
  border-color: var(--c-btn-highlight);
  background: linear-gradient(180deg, rgba(26, 36, 75, 0.95) 0%, rgba(16, 27, 60, 0.95) 100%);
  box-shadow: 0 12px 36px rgba(167, 154, 244, 0.28);
}
.featured-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--c-ladder-warm) 0%, #ffc880 100%);
  color: #080F27;
  font-size: 0.78rem;
  font-weight: 800;
  padding: 4px 16px;
  border-radius: var(--radius-full);
  letter-spacing: 0.05em;
  white-space: nowrap;
}

.plan-header {
  border-bottom: 1px solid rgba(167, 154, 244, 0.15);
  padding-bottom: 24px;
  margin-bottom: 24px;
  text-align: center;
}
.plan-name {
  font-size: 1.4rem;
  color: var(--c-ice-white);
  margin-bottom: 8px;
}
.plan-tagline {
  font-size: 0.85rem;
  color: var(--c-text-dim);
}
.plan-price-wrap {
  margin-top: 16px;
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 4px;
}
.price-currency {
  font-size: 1.25rem;
  color: var(--c-ladder-warm);
  font-weight: 700;
}
.price-amount {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--c-ice-white);
  line-height: 1;
}
.price-period {
  font-size: 0.88rem;
  color: var(--c-text-dim);
}

.plan-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 32px;
  flex-grow: 1;
}
.plan-feature-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--c-text-muted);
}
.plan-feature-item strong {
  color: var(--c-ice-white);
}
.plan-feature-item svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  stroke: var(--c-soft-violet);
}

.pricing-note {
  text-align: center;
  font-size: 0.86rem;
  color: var(--c-text-dim);
  margin-top: 36px;
}

/* ==========================================================================
   模块 08：登梯三步使用指南 (垂直向上阶梯式时间线)
   ========================================================================== */
.steps-section {
  padding: 100px 0;
  background: linear-gradient(180deg, var(--c-deep-space) 0%, var(--c-midnight) 100%);
  position: relative;
}
.timeline-vertical {
  max-width: 780px;
  margin: 54px auto 0 auto;
  position: relative;
}
.timeline-vertical::before {
  content: "";
  position: absolute;
  top: 40px;
  bottom: 40px;
  left: 40px;
  width: 3px;
  background: linear-gradient(180deg, var(--c-ladder-warm) 0%, var(--c-soft-violet) 50%, var(--c-cloud-violet) 100%);
  border-radius: var(--radius-full);
}
.timeline-step {
  display: flex;
  gap: 36px;
  margin-bottom: 48px;
  position: relative;
}
.timeline-step:last-child {
  margin-bottom: 0;
}
.step-number-wrap {
  width: 80px;
  height: 80px;
  flex-shrink: 0;
  border-radius: var(--radius-full);
  background: var(--c-midnight);
  border: 2px solid var(--c-soft-violet);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--c-ladder-warm);
  box-shadow: 0 0 20px rgba(167, 154, 244, 0.3);
  z-index: 2;
}
.step-content {
  background: var(--glass-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: 26px 30px;
  flex-grow: 1;
}
.step-title {
  font-size: 1.25rem;
  color: var(--c-ice-white);
  margin-bottom: 10px;
}
.step-desc {
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--c-text-muted);
}

/* ==========================================================================
   模块 09：真实用户评价与选择建议
   ========================================================================== */
.advisory-section {
  padding: 100px 0;
  background-color: var(--c-deep-space);
}

.reviews-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 44px;
  margin-bottom: 64px;
}
.review-card {
  background: var(--glass-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  transition: var(--transition-smooth);
}
.review-card:hover {
  transform: translateY(-4px);
  border-color: var(--c-soft-violet);
  box-shadow: 0 14px 34px rgba(117, 102, 200, 0.22);
}
.review-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  flex-wrap: wrap;
  gap: 10px;
}
.review-author-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
}
.review-avatar {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--c-midnight) 0%, #1e1b4b 100%);
  border: 1.5px solid var(--c-soft-violet);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--c-ladder-warm);
  font-weight: 700;
  font-size: 1.05rem;
  box-shadow: 0 0 12px rgba(167, 154, 244, 0.2);
}
.review-author-name {
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--c-ice-white);
  line-height: 1.3;
}
.review-author-role {
  font-size: 0.8rem;
  color: var(--c-text-dim);
}
.review-stars {
  display: flex;
  gap: 3px;
}
.review-stars svg {
  width: 15px;
  height: 15px;
  fill: var(--c-ladder-warm);
  stroke: var(--c-ladder-warm);
}
.review-quote {
  font-size: 0.95rem;
  line-height: 1.78;
  color: #D2DBF0;
  margin-bottom: 18px;
  flex-grow: 1;
}
.review-tag-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid rgba(167, 154, 244, 0.12);
  padding-top: 14px;
  flex-wrap: wrap;
  gap: 8px;
}
.review-tag {
  font-size: 0.78rem;
  color: var(--c-ladder-warm);
  background: rgba(117, 102, 200, 0.16);
  padding: 3px 10px;
  border-radius: var(--radius-full);
  border: 1px solid rgba(167, 154, 244, 0.2);
}
.review-plan {
  font-size: 0.78rem;
  color: var(--c-text-dim);
}

.advisory-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin-top: 24px;
}
.advisory-card {
  background: var(--glass-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: 32px 26px;
}
.advisory-badge {
  color: var(--c-ladder-warm);
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 12px;
}
.advisory-title {
  font-size: 1.18rem;
  color: var(--c-ice-white);
  margin-bottom: 12px;
}
.advisory-text {
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--c-text-muted);
}

/* ==========================================================================
   模块 10：FAQ 常见问题 (原生 details / summary)
   ========================================================================== */
.faq-section {
  padding: 100px 0;
  background-color: var(--c-deep-space);
}
.faq-list {
  max-width: 860px;
  margin: 48px auto 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
details.faq-item {
  background: var(--glass-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: 22px 28px;
  transition: var(--transition-smooth);
}
details.faq-item[open] {
  border-color: var(--c-soft-violet);
  background: rgba(16, 27, 60, 0.92);
}
summary.faq-summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--c-ice-white);
  cursor: pointer;
  list-style: none;
  user-select: none;
}
summary.faq-summary::-webkit-details-marker {
  display: none;
}
.faq-arrow {
  width: 20px;
  height: 20px;
  stroke: var(--c-soft-violet);
  transition: transform 0.24s ease;
  flex-shrink: 0;
}
details.faq-item[open] .faq-arrow {
  transform: rotate(180deg);
  stroke: var(--c-ladder-warm);
}
.faq-answer {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid rgba(167, 154, 244, 0.12);
  font-size: 0.96rem;
  line-height: 1.8;
  color: var(--c-text-muted);
}

/* ==========================================================================
   模块 11：云海终章 CTA
   ========================================================================== */
.finale-section {
  position: relative;
  padding: 140px 0 120px 0;
  text-align: center;
  overflow: hidden;
  background-color: var(--c-deep-space);
}
.finale-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  pointer-events: none;
}
.finale-content {
  position: relative;
  z-index: 2;
  max-width: 720px;
  margin: 0 auto;
}
.finale-title {
  font-size: clamp(2.2rem, 4.4vw, 3.4rem);
  color: var(--c-ice-white);
  margin-bottom: 20px;
  text-shadow: 0 4px 24px rgba(8, 15, 39, 0.9);
}
.finale-desc {
  font-size: 1.15rem;
  color: var(--c-ladder-warm);
  margin-bottom: 40px;
  line-height: 1.7;
}

/* ==========================================================================
   模块 12：独立页脚 (4 大核心入口)
   ========================================================================== */
.site-footer {
  background: #050A1A;
  border-top: 1px solid rgba(117, 102, 200, 0.15);
  padding: 56px 0 36px 0;
  font-size: 0.92rem;
  color: var(--c-text-dim);
}
.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 36px;
  flex-wrap: wrap;
  gap: 24px;
}
.footer-nav {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}
.footer-nav a {
  color: var(--c-text-muted);
  font-weight: 500;
  font-size: 0.94rem;
}
.footer-nav a:hover {
  color: var(--c-ladder-warm);
}
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 24px;
  flex-wrap: wrap;
  gap: 16px;
}
.footer-legal-note {
  font-size: 0.82rem;
  color: #63708D;
  max-width: 650px;
  line-height: 1.6;
}

/* ==========================================================================
   响应式断点适配 (1440, 1024, 768, 390, 360)
   ========================================================================== */
@media (max-width: 1200px) {
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 1024px) {
  .platform-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .story-chapter {
    gap: 36px;
  }
  .device-tags-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  :root {
    --nav-height: 68px;
  }
  
  .menu-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
  }
  
  .nav-menu {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    width: 100%;
    background: rgba(8, 15, 39, 0.98);
    backdrop-filter: var(--glass-blur);
    flex-direction: column;
    padding: 32px 24px;
    gap: 20px;
    border-bottom: 1px solid var(--glass-border);
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.3s ease, opacity 0.3s ease;
  }
  .nav-menu.active {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  
  .story-chapter {
    grid-template-columns: 1fr;
    gap: 28px;
  }
  .story-chapter.ch-left-img .story-media,
  .story-chapter.ch-left-img .story-text,
  .story-chapter.ch-right-img .story-media,
  .story-chapter.ch-right-img .story-text {
    order: initial;
  }
  
  .platform-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .timeline-vertical::before {
    left: 28px;
  }
  .step-number-wrap {
    width: 58px;
    height: 58px;
    font-size: 1.2rem;
  }
  .timeline-step {
    gap: 20px;
  }
  
  .pricing-grid {
    grid-template-columns: 1fr;
  }
  .reviews-grid {
    grid-template-columns: 1fr;
  }
  .advisory-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-top, .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
  .footer-nav {
    flex-wrap: wrap;
    gap: 18px;
  }
}

@media (max-width: 480px) {
  .hero-cta-group {
    flex-direction: column;
    width: 100%;
  }
  .hero-cta-group .btn {
    width: 100%;
  }
  .platform-grid {
    grid-template-columns: 1fr;
  }
  .device-tags-grid {
    grid-template-columns: 1fr;
  }
}

/* 动效降级支持 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}