/* ==========================================================================
   星维机场 第2套 - 维面斜切系统 (Dimension Slant-Cut System) Design System CSS
   ========================================================================== */

:root {
  /* Brand Color Palette - Warm Premium Palette */
  --bg: #FAF5EC;            /* 米杏主背景 / Rice Beige */
  --surface: #FFFDFC;       /* 纯白卡片与文本盒 / Pure White */
  --text: #282421;          /* 主文字 / Primary Text */
  --muted: #655E58;         /* 正文文字 / Body Text */
  --muted-secondary: #8C837B;/* 次级文字 / Secondary Text */

  --wine: #743E45;         /* 深酒红 / Accent Wine Red */
  --wine-dark: #5C3036;    /* 暗酒红 / Dark Wine Red (Footer) */
  --wine-light: #F1E3E2;   /* 浅酒红 / Light Wine Red */

  --green: #566358;        /* 墨绿色 / Dark Moss Green */
  --green-dark: #424D45;   /* 深墨绿 / Deep Moss Green */
  --green-light: #EAEDE7;  /* 浅墨绿 / Light Moss Green */

  --copper: #A1724E;       /* 铜棕色 / Copper Brown */
  --copper-dark: #865A3D;  /* 深铜 / Deep Copper */

  --apricot: #F2E7D9;      /* 浅杏色 / Light Apricot */
  --cream-apricot: #F7EFE4;/* 奶油杏 / Cream Apricot */

  --border: #DED4C8;       /* 边框 / Border */
  --border-dark: #CABAAA;  /* 深边框 / Dark Border */

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  --line-height-body: 1.8;
  --line-height-heading: 1.25;

  /* Spacing & Container */
  --container-max: 1200px;
  --section-space: 80px;

  /* Slant Cut Angles & Values */
  --slant-angle-deg: 14deg;
  --slant-height: 48px;
}

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

html {
  font-family: var(--font-sans);
  font-size: 16px;
  background-color: var(--bg);
  color: var(--text);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  line-height: var(--line-height-body);
  background-color: var(--bg);
  color: var(--text);
  overflow-x: hidden;
}

/* ALL TEXT MUST BE HORIZONTAL. NO ROTATION ON TEXT! */
h1, h2, h3, h4, h5, h6, p, span, a, button, li, th, td, label, div {
  transform: none !important;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease, background-color 0.2s ease, opacity 0.2s ease;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

ul, ol {
  list-style: none;
}

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

/* Accessibility Focus States */
:focus-visible {
  outline: 3px solid var(--wine);
  outline-offset: 3px;
  border-radius: 4px;
}

/* Container Structure */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

.section-padding {
  padding: var(--section-space) 0;
  position: relative;
}

/* Header Component */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: 72px;
  background-color: var(--bg);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(8px);
}

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

.brand-logo-group {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-logo-svg {
  height: 36px;
  width: auto;
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-size: 20px;
  font-weight: 750;
  color: var(--text);
  letter-spacing: -0.5px;
  line-height: 1.1;
}

.brand-sub {
  font-size: 11px;
  color: var(--copper);
  font-weight: 600;
  letter-spacing: 0.5px;
}

/* Main Navigation */
.main-nav {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 20px;
}

.nav-link {
  font-size: 15px;
  font-weight: 500;
  color: var(--text);
  padding: 6px 4px;
  position: relative;
}

.nav-link:hover {
  color: var(--wine);
}

.nav-link.active {
  color: var(--wine);
  font-weight: 700;
}

/* Current active item slant short line */
.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 3px;
  background-color: var(--wine);
  clip-path: polygon(0 0, 100% 0, 85% 100%, 0 100%);
}

.header-cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background-color: var(--wine);
  color: var(--surface);
  font-weight: 650;
  font-size: 14px;
  padding: 10px 20px;
  border-radius: 4px;
  clip-path: polygon(0 0, 100% 0, 95% 100%, 0 100%);
  transition: transform 0.2s ease, background-color 0.2s ease;
}

.header-cta-btn:hover {
  background-color: var(--wine-dark);
  transform: translateY(-1px);
}

/* Mobile Menu Toggle */
.mobile-nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  padding: 4px;
  z-index: 110;
}

.mobile-nav-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--text);
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.mobile-nav-drawer {
  display: none;
  position: fixed;
  top: 72px;
  left: 0;
  width: 100%;
  height: calc(100vh - 72px);
  background-color: var(--bg);
  border-top: 1px solid var(--border);
  padding: 24px;
  overflow-y: auto;
  z-index: 99;
}

.mobile-nav-drawer.open {
  display: block;
}

.mobile-nav-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.mobile-nav-link {
  font-size: 18px;
  font-weight: 600;
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
}

.mobile-cta-wrapper {
  margin-top: 24px;
}

.mobile-cta-btn {
  display: block;
  text-align: center;
  background-color: var(--wine);
  color: var(--surface);
  font-weight: 700;
  font-size: 16px;
  padding: 14px;
  border-radius: 4px;
}

/* Section Common Headings & Slant Headers */
.section-tag {
  display: inline-block;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 1px;
  color: var(--copper);
  margin-bottom: 8px;
  position: relative;
  padding-left: 12px;
}

.section-tag::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%) !important;
  width: 4px;
  height: 16px;
  background-color: var(--wine);
  clip-path: polygon(0 0, 100% 20%, 100% 100%, 0 80%);
}

.section-h2 {
  font-size: clamp(28px, 4vw, 38px);
  font-weight: 750;
  line-height: var(--line-height-heading);
  color: var(--text);
  margin-bottom: 16px;
}

.section-lead {
  font-size: 17px;
  color: var(--muted);
  max-width: 820px;
  line-height: 1.8;
  margin-bottom: 36px;
}

/* HERO SECTION: 三面斜切封面 */
.hero-section {
  position: relative;
  background-color: var(--bg);
  padding: 40px 0 60px 0;
  overflow: hidden;
}

.hero-three-surface-grid {
  display: grid;
  grid-template-columns: 55% 27% 18%;
  gap: 0;
  min-height: 580px;
  position: relative;
}

/* Face 1: Brand / Main Text (55%) */
.hero-face-main {
  background-color: var(--surface);
  border: 1px solid var(--border);
  padding: 48px 40px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  position: relative;
  z-index: 3;
  clip-path: polygon(0 0, 100% 0, 92% 100%, 0 100%);
  margin-right: -40px;
}

.hero-kicker {
  font-size: 15px;
  font-weight: 700;
  color: var(--copper);
  margin-bottom: 12px;
  display: block;
}

.hero-h1 {
  font-size: clamp(34px, 4.5vw, 54px);
  font-weight: 800;
  line-height: 1.2;
  color: var(--text);
  margin-bottom: 20px;
  letter-spacing: -0.5px;
}

.hero-subhead {
  font-size: 20px;
  font-weight: 700;
  color: var(--wine);
  margin-bottom: 16px;
}

.hero-body {
  font-size: 16px;
  color: var(--muted);
  margin-bottom: 32px;
  line-height: 1.8;
  max-width: 90%;
}

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

.btn-primary-wine {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background-color: var(--wine);
  color: var(--surface);
  font-size: 16px;
  font-weight: 700;
  padding: 14px 28px;
  border-radius: 4px;
  clip-path: polygon(0 0, 100% 0, 94% 100%, 0 100%);
  box-shadow: 0 4px 12px rgba(116, 62, 69, 0.15);
  transition: transform 0.2s ease, background-color 0.2s ease;
}

.btn-primary-wine:hover {
  background-color: var(--wine-dark);
  transform: translateY(-2px);
}

.btn-secondary-apricot {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background-color: var(--apricot);
  color: var(--text);
  font-size: 15px;
  font-weight: 650;
  padding: 14px 22px;
  border: 1px solid var(--border-dark);
  border-radius: 4px;
  transition: background-color 0.2s ease;
}

.btn-secondary-apricot:hover {
  background-color: var(--cream-apricot);
}

.hero-review-link {
  display: inline-block;
  font-size: 14px;
  font-weight: 600;
  color: var(--copper);
  margin-top: 16px;
  text-decoration: underline;
}

/* Face 2: AI Scene (27%) */
.hero-face-ai {
  background-color: var(--wine);
  color: var(--surface);
  padding: 44px 32px 44px 50px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  position: relative;
  z-index: 2;
  clip-path: polygon(8% 0, 100% 0, 90% 100%, 0 100%);
  margin-right: -30px;
}

.hero-face-ai h3 {
  font-size: 22px;
  font-weight: 750;
  color: #FFFDFC;
  margin-bottom: 8px;
  border-bottom: 2px solid rgba(255, 253, 252, 0.3);
  padding-bottom: 8px;
}

.hero-face-ai p {
  font-size: 13px;
  color: var(--wine-light);
  margin-bottom: 20px;
}

.hero-app-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.app-tag {
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.25);
  color: #FFFDFC;
  font-size: 13px;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: 3px;
}

/* Face 3: Streaming / Office / Multi-device (18%) */
.hero-face-media {
  background-color: var(--green);
  color: var(--surface);
  padding: 44px 28px 44px 44px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  position: relative;
  z-index: 1;
  clip-path: polygon(10% 0, 100% 0, 100% 100%, 0 100%);
}

.hero-face-media h3 {
  font-size: 20px;
  font-weight: 750;
  color: #FFFDFC;
  margin-bottom: 8px;
  border-bottom: 2px solid rgba(255, 253, 252, 0.3);
  padding-bottom: 8px;
}

.hero-face-media p {
  font-size: 13px;
  color: var(--green-light);
  margin-bottom: 18px;
}

/* SECTION 01: AI与开发 */
.section-ai-dev {
  background-color: var(--wine);
  color: var(--surface);
  clip-path: polygon(0 40px, 100% 0, 100% calc(100% - 40px), 0 100%);
  padding: 100px 0;
}

.section-ai-dev .section-tag {
  color: #F1E3E2;
}

.section-ai-dev .section-tag::before {
  background-color: var(--apricot);
}

.section-ai-dev .section-h2 {
  color: #FFFDFC;
}

.section-ai-dev .section-lead {
  color: var(--wine-light);
}

.ai-slant-surface {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.15);
  padding: 40px;
  border-radius: 4px;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 32px;
  position: relative;
}

.ai-column {
  background: rgba(0, 0, 0, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 24px;
}

.ai-column h3 {
  font-size: 20px;
  font-weight: 700;
  color: #FFFDFC;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.ai-column p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--wine-light);
  margin-bottom: 16px;
}

.ai-tech-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.ai-tech-pill {
  background: rgba(255, 255, 255, 0.15);
  color: #FFFDFC;
  font-size: 12px;
  font-weight: 600;
  padding: 4px 10px;
}

/* SECTION 02: 视频与流媒体 */
.section-streaming {
  background-color: var(--green);
  color: var(--surface);
  clip-path: polygon(0 0, 100% 30px, 100% 100%, 0 calc(100% - 30px));
  padding: 90px 0;
}

.section-streaming .section-tag {
  color: var(--green-light);
}

.section-streaming .section-tag::before {
  background-color: var(--copper);
}

.section-streaming .section-h2 {
  color: #FFFDFC;
}

.section-streaming .section-lead {
  color: var(--green-light);
}

.streaming-surface-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 32px;
}

.streaming-box {
  background: rgba(0, 0, 0, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.15);
  padding: 28px;
}

.streaming-box h3 {
  font-size: 22px;
  font-weight: 750;
  color: #FFFDFC;
  margin-bottom: 12px;
}

.streaming-box p {
  font-size: 14px;
  color: var(--green-light);
  line-height: 1.7;
}

.streaming-bottom-strip {
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid rgba(255, 255, 255, 0.2);
  padding: 20px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.streaming-notice {
  font-size: 14px;
  color: var(--green-light);
  max-width: 750px;
}

/* SECTION 03: 日常浏览与社交 */
.section-daily {
  background-color: var(--bg);
  padding: 80px 0;
}

.daily-slant-bg {
  background: linear-gradient(135deg, var(--surface) 0%, var(--cream-apricot) 100%);
  border: 1px solid var(--border);
  padding: 48px;
  clip-path: polygon(0 0, 100% 20px, 100% 100%, 0 calc(100% - 20px));
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

.daily-content-block h3 {
  font-size: 22px;
  font-weight: 700;
  color: var(--wine);
  margin-bottom: 14px;
}

.daily-content-block p {
  font-size: 15px;
  color: var(--muted);
  line-height: 1.8;
  margin-bottom: 16px;
}

.daily-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.daily-list-item {
  font-size: 14px;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 8px;
}

.daily-list-item::before {
  content: '✦';
  color: var(--copper);
}

/* SECTION 04: 跨境办公 */
.section-office {
  background-color: var(--apricot);
  padding: 90px 0;
  border-top: 4px solid var(--wine);
  border-bottom: 4px solid var(--wine);
  position: relative;
}

.office-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 40px;
  align-items: center;
}

.office-left h3 {
  font-size: 26px;
  font-weight: 750;
  color: var(--text);
  margin-bottom: 16px;
}

.office-left p {
  font-size: 16px;
  color: var(--muted);
  line-height: 1.8;
}

.office-right-card {
  background-color: var(--surface);
  border: 1px solid var(--border-dark);
  padding: 36px;
  clip-path: polygon(0 0, 100% 0, 95% 100%, 0 100%);
}

.office-features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.office-feat-item h4 {
  font-size: 16px;
  font-weight: 700;
  color: var(--wine);
  margin-bottom: 6px;
}

.office-feat-item p {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.6;
}

/* SECTION 05: 多设备使用 */
.section-multidevice {
  background-color: var(--bg);
  padding: 80px 0;
}

.device-band-container {
  background-color: var(--surface);
  border: 1px solid var(--border);
  padding: 40px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.device-slant-band {
  background-color: var(--cream-apricot);
  border-left: 4px solid var(--copper);
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  transition: transform 0.2s ease, background-color 0.2s ease;
}

.device-slant-band:hover {
  background-color: var(--apricot);
  transform: translateX(4px);
}

.device-band-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
}

.device-band-desc {
  font-size: 14px;
  color: var(--muted);
  max-width: 650px;
}

/* SECTION 06: 不同场景需要多少流量？ (TABLE) */
.section-traffic {
  background-color: var(--surface);
  padding: 90px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.table-wrapper {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--border);
  background-color: var(--surface);
}

.custom-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 15px;
}

.custom-table th {
  background-color: var(--apricot);
  color: var(--text);
  font-weight: 700;
  padding: 16px 20px;
  border-bottom: 2px solid var(--border-dark);
}

.custom-table td {
  padding: 18px 20px;
  border-bottom: 1px solid var(--border);
  color: var(--muted);
  line-height: 1.6;
}

.custom-table tr:nth-child(even) td {
  background-color: var(--bg);
}

.table-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  padding: 4px 8px;
  border-radius: 2px;
  background-color: var(--wine-light);
  color: var(--wine);
}

/* SECTION 07: 地区怎么选？ */
.section-regions {
  background-color: var(--bg);
  padding: 90px 0;
}

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

.region-slant-block {
  background-color: var(--surface);
  border: 1px solid var(--border);
  padding: 36px;
  position: relative;
  overflow: hidden;
}

.region-slant-block::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 60px;
  height: 100%;
  background-color: var(--cream-apricot);
  clip-path: polygon(50% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.region-name {
  font-size: 24px;
  font-weight: 750;
  color: var(--wine);
  margin-bottom: 10px;
}

.region-desc {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.75;
  margin-bottom: 16px;
}

.region-scenarios-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.region-badge {
  font-size: 12px;
  font-weight: 600;
  background-color: var(--green-light);
  color: var(--green-dark);
  padding: 4px 10px;
}

/* SECTION 08: 线路怎么理解？ */
.section-lines {
  background-color: var(--cream-apricot);
  padding: 90px 0;
  border-top: 1px solid var(--border-dark);
  border-bottom: 1px solid var(--border-dark);
  position: relative;
}

.lines-header {
  margin-bottom: 32px;
}

/* SECTION 09: 完整套餐价格 (斜切价带) */
.section-pricing {
  background-color: var(--bg);
  padding: 90px 0;
}

.pricing-slant-container {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 1000px;
  margin: 0 auto;
}

.price-strip {
  background-color: var(--surface);
  border: 1px solid var(--border);
  padding: 24px 36px;
  display: grid;
  grid-template-columns: 60px 1.5fr 1fr 1fr 1.5fr;
  align-items: center;
  gap: 20px;
  position: relative;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.price-strip:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(0,0,0,0.06);
}

.strip-num {
  font-size: 20px;
  font-weight: 800;
  color: var(--border-dark);
}

.strip-info h3 {
  font-size: 20px;
  font-weight: 750;
  color: var(--text);
  margin-bottom: 4px;
}

.strip-info p {
  font-size: 13px;
  color: var(--muted);
}

.strip-traffic {
  font-size: 18px;
  font-weight: 700;
  color: var(--copper);
}

.strip-price {
  font-size: 28px;
  font-weight: 800;
  color: var(--wine);
  letter-spacing: -0.5px;
}

.strip-price span {
  font-size: 13px;
  font-weight: 500;
  color: var(--muted-secondary);
}

.strip-cta {
  text-align: right;
}

/* 主力推荐套餐: 视觉最大 & 酒红 highlight */
.price-strip.featured-strip {
  background-color: var(--wine);
  border-color: var(--wine-dark);
  color: #FFFDFC;
  padding: 32px 36px;
  clip-path: polygon(0 0, 100% 0, 98% 100%, 0 100%);
  box-shadow: 0 8px 24px rgba(116, 62, 69, 0.25);
}

.price-strip.featured-strip .strip-num {
  color: rgba(255, 255, 255, 0.4);
}

.price-strip.featured-strip .strip-info h3 {
  color: #FFFDFC;
}

.price-strip.featured-strip .strip-info p {
  color: var(--wine-light);
}

.price-strip.featured-strip .strip-traffic {
  color: var(--apricot);
}

.price-strip.featured-strip .strip-price {
  color: #FFFDFC;
}

.price-strip.featured-strip .strip-price span {
  color: var(--wine-light);
}

.featured-badge {
  display: inline-block;
  background-color: var(--copper);
  color: #FFFDFC;
  font-size: 11px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 2px;
  margin-left: 8px;
  vertical-align: middle;
}

/* SECTION 10: 客户端与设备 (设备切面) */
.section-clients {
  background-color: var(--surface);
  padding: 90px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.device-cut-surface {
  background-color: var(--bg);
  border: 1px solid var(--border-dark);
  padding: 40px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  position: relative;
}

.client-block {
  background-color: var(--surface);
  border: 1px solid var(--border);
  padding: 28px;
  border-left: 4px solid var(--wine);
}

.client-block h3 {
  font-size: 20px;
  font-weight: 750;
  color: var(--text);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.client-block p {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.75;
  margin-bottom: 16px;
}

.client-steps {
  font-size: 13px;
  color: var(--muted-secondary);
  line-height: 1.7;
}

/* SECTION 11: 星维机场场景评测 */
.section-review {
  background-color: var(--bg);
  padding: 90px 0;
}

.review-card-banner {
  background-color: var(--wine);
  color: #FFFDFC;
  padding: 48px;
  clip-path: polygon(0 0, 100% 20px, 100% 100%, 0 calc(100% - 20px));
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.review-card-banner h3 {
  font-size: clamp(24px, 3.5vw, 32px);
  font-weight: 750;
}

.review-card-banner p {
  font-size: 16px;
  color: var(--wine-light);
  line-height: 1.8;
  max-width: 850px;
}

/* SECTION 12: 网络问题解决 (场景排障) */
.section-troubleshooting {
  background-color: var(--surface);
  padding: 90px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.trouble-slash-container {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.trouble-item {
  background-color: var(--bg);
  border: 1px solid var(--border);
  padding: 28px;
  border-left: 5px solid var(--copper);
}

.trouble-item h3 {
  font-size: 19px;
  font-weight: 750;
  color: var(--wine);
  margin-bottom: 10px;
}

.trouble-item p {
  font-size: 15px;
  color: var(--muted);
  line-height: 1.75;
}

/* SECTION 13: 场景型文章中心 */
.section-articles {
  background-color: var(--bg);
  padding: 90px 0;
}

.articles-category-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.article-cat-block {
  background-color: var(--surface);
  border: 1px solid var(--border);
}

.article-cat-header {
  background-color: var(--apricot);
  padding: 16px 24px;
  border-bottom: 1px solid var(--border-dark);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.article-cat-header h3 {
  font-size: 18px;
  font-weight: 750;
  color: var(--text);
}

.article-cat-header a {
  font-size: 13px;
  font-weight: 600;
  color: var(--wine);
}

.article-list {
  padding: 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.article-item-row {
  border-bottom: 1px dashed var(--border);
  padding-bottom: 14px;
}

.article-item-row:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.article-item-title {
  font-size: 16px;
  font-weight: 650;
  color: var(--text);
  margin-bottom: 4px;
  display: block;
}

.article-item-title:hover {
  color: var(--wine);
}

.article-item-desc {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.6;
}

.article-item-meta {
  font-size: 12px;
  color: var(--muted-secondary);
  margin-top: 6px;
  display: flex;
  gap: 16px;
}

/* SECTION 14: FAQ (场景型常见问题) */
.section-faq {
  background-color: var(--surface);
  padding: 90px 0;
  border-top: 1px solid var(--border);
}

.faq-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 40px;
}

.faq-sidebar-tags {
  display: flex;
  flex-direction: column;
  gap: 10px;

}

.faq-tag-btn {
  text-align: left;
  font-size: 15px;
  font-weight: 600;
  padding: 12px 18px;
  border-left: 3px solid transparent;
  color: var(--muted);
  transition: all 0.2s ease;
}

.faq-tag-btn.active, .faq-tag-btn:hover {
  border-left-color: var(--wine);
  background-color: var(--bg);
  color: var(--wine);
  font-weight: 750;
}

.faq-accordion-group {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  border-bottom: 1px solid var(--border);
  padding-bottom: 16px;
}

.faq-question {
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
  cursor: pointer;
  padding: 8px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-question:hover {
  color: var(--wine);
}

.faq-answer {
  font-size: 15px;
  color: var(--muted);
  line-height: 1.75;
  padding-top: 8px;
}

/* ARTICLE / CATEGORY / LEGAL PAGES STYLES */
.page-hero {
  background-color: var(--wine);
  color: #FFFDFC;
  padding: 60px 0;
  clip-path: polygon(0 0, 100% 0, 100% 90%, 0 100%);
  margin-bottom: 40px;
}

.page-hero-title {
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 750;
  margin-bottom: 16px;
}

.page-hero-meta {
  font-size: 14px;
  color: var(--wine-light);
  display: flex;
  gap: 20px;
}

.breadcrumb {
  font-size: 14px;
  color: var(--muted-secondary);
  margin-bottom: 24px;
}

.breadcrumb a {
  color: var(--text);
}

.breadcrumb a:hover {
  color: var(--wine);
}

.article-container-layout {
  display: grid;
  grid-template-columns: 1fr 240px;
  gap: 48px;
}

.article-content {
  background-color: var(--surface);
  border: 1px solid var(--border);
  padding: 48px;
  max-width: 820px;
}

.article-content h1 {
  font-size: 32px;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 20px;
  line-height: 1.3;
}

.article-content h2 {
  font-size: 24px;
  font-weight: 750;
  color: var(--wine);
  margin: 36px 0 16px 0;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--apricot);
}

.article-content h3 {
  font-size: 19px;
  font-weight: 700;
  color: var(--text);
  margin: 24px 0 12px 0;
}

.article-content p {
  font-size: 16px;
  color: var(--muted);
  line-height: 1.85;
  margin-bottom: 20px;
}

.article-content ul, .article-content ol {
  margin-bottom: 20px;
  padding-left: 24px;
}

.article-content li {
  font-size: 16px;
  color: var(--muted);
  line-height: 1.8;
  margin-bottom: 8px;
}

.quick-conclusion-box {
  background-color: var(--apricot);
  border-left: 4px solid var(--wine);
  padding: 24px;
  margin-bottom: 32px;
}

.quick-conclusion-box h3 {
  font-size: 18px;
  font-weight: 750;
  color: var(--wine);
  margin-top: 0;
  margin-bottom: 10px;
}

.toc-sidebar {
  position: sticky;
  top: 90px;
  height: fit-content;
  background-color: var(--surface);
  border: 1px solid var(--border);
  padding: 20px;
}

.toc-title {
  font-size: 15px;
  font-weight: 750;
  color: var(--text);
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.toc-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 13px;
}

.toc-list a {
  color: var(--muted);
}

.toc-list a:hover {
  color: var(--wine);
}

/* FOOTER COMPONENT (Dark Wine Red #5C3036) */
.site-footer {
  background-color: var(--wine-dark);
  color: #FFFDFC;
  padding: 60px 0 30px 0;
  border-top: 4px solid var(--copper);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(4, 1fr);
  gap: 32px;
  margin-bottom: 48px;
}

.footer-brand .brand-name {
  color: #FFFDFC;
  font-size: 22px;
}

.footer-brand p {
  font-size: 13px;
  color: var(--wine-light);
  margin-top: 10px;
  line-height: 1.6;
}

.footer-col h4 {
  font-size: 16px;
  font-weight: 750;
  color: var(--apricot);
  margin-bottom: 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.15);
  padding-bottom: 8px;
}

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

.footer-col a {
  font-size: 14px;
  color: var(--wine-light);
}

.footer-col a:hover {
  color: #FFFDFC;
  text-decoration: underline;
}

.footer-friends-bar {
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  padding-top: 24px;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.friends-label {
  font-size: 14px;
  font-weight: 700;
  color: var(--apricot);
}

.friend-link {
  font-size: 13px;
  color: var(--wine-light);
}

.friend-link:hover {
  color: #FFFDFC;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 20px;
  text-align: center;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.6);
}

/* RESPONSIVE MEDIA QUERIES */

/* Desktop Large (1440px) */
@media (min-width: 1440px) {
  :root {
    --container-max: 1280px;
  }
}

/* Tablet / Small Laptop (1024px) */
@media (max-width: 1024px) {
  .hero-three-surface-grid {
    grid-template-columns: 1fr;
    min-height: auto;
  }

  .hero-face-main {
    clip-path: none;
    margin-right: 0;
    margin-bottom: 16px;
  }

  .hero-face-ai, .hero-face-media {
    clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%);
    margin-right: 0;
    margin-bottom: 16px;
    padding: 32px;
  }

  .ai-slant-surface {
    grid-template-columns: 1fr;
  }

  .streaming-surface-grid {
    grid-template-columns: 1fr;
  }

  .daily-slant-bg {
    grid-template-columns: 1fr;
    padding: 32px;
  }

  .office-grid {
    grid-template-columns: 1fr;
  }

  .price-strip {
    grid-template-columns: 40px 1fr 1fr;
    gap: 12px;
  }

  .price-strip .strip-cta {
    grid-column: span 3;
    text-align: left;
    margin-top: 8px;
  }

  .device-cut-surface {
    grid-template-columns: 1fr;
  }

  .articles-category-grid {
    grid-template-columns: 1fr;
  }

  .faq-layout {
    grid-template-columns: 1fr;
  }

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

  .article-container-layout {
    grid-template-columns: 1fr;
  }

  .toc-sidebar {
    display: none;
  }
}

/* Mobile Screen Breakpoints (768px, 430px, 390px, 375px) */
@media (max-width: 768px) {
  .main-nav {
    display: none;
  }

  .mobile-nav-toggle {
    display: flex;
  }

  .hero-face-main {
    padding: 32px 20px;
  }

  .hero-h1 {
    font-size: 28px;
  }

  .section-h2 {
    font-size: 24px;
  }

  .price-strip {
    grid-template-columns: 1fr;
    padding: 20px;
    clip-path: none !important;
  }

  .price-strip .strip-cta {
    grid-column: span 1;
  }

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

  .section-ai-dev, .section-streaming, .review-card-banner {
    clip-path: none;
  }
}

/* Reduced Motion Handling */
@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;
  }
}