/* ==========================================================================
   红杏加速器 (hongxinjiasu.lol) — 新中式数智山水·东方留白禅意设计体系
   视觉范式：东方书卷雅集 × 先锋数字云网 × 朱砂泥金气象
   ========================================================================== */

:root {
  /* 东方自然矿物与宣纸墨色体系 */
  --bg-rice: #F9F7F2;          /* 仿古宣纸底色 */
  --bg-silk: #F2EFE8;          /* 霜帛浅米色 */
  --bg-pure: #FFFFFF;          /* 澄心白 */
  --bg-card: #FFFFFF;
  --bg-dark-ink: #141D22;      /* 焦墨玄青 */
  --bg-dark-pine: #112022;     /* 苍松墨绿 */
  
  --ink-primary: #192329;      /* 黛墨浓黑（主文本） */
  --ink-secondary: #485760;    /* 宿墨烟灰（次级说明） */
  --ink-muted: #7E8E98;        /* 远山轻岚（微弱注释） */
  
  --cinnabar: #C24838;         /* 朱砂赤玺（主强调色，高贵沉稳非AI土色） */
  --cinnabar-hover: #A83628;   /* 熟朱砂深红 */
  --cinnabar-light: #FDF2F0;   /* 桃花浅露 */
  --cinnabar-border: #F3CEC8;  /* 赤泥浅边 */
  
  --jade-pine: #265B54;        /* 松岚翠玉（辅助国风青绿） */
  --jade-light: #EBF4F2;       /* 玉露淡青 */
  --jade-border: #C8DFDC;
  
  --gold-bronze: #B38646;      /* 泥金勾勒 */
  --gold-light: #FAF3E8;       /* 浅金素绢 */
  
  --border-silk: #E5E0D4;      /* 宣线边框 */
  --border-hover: #CFC8B8;
  
  --font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  
  --radius-xs: 3px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  
  --shadow-ink-sm: 0 2px 6px rgba(25, 35, 41, 0.04);
  --shadow-ink-md: 0 8px 24px rgba(25, 35, 41, 0.08);
  --shadow-ink-lg: 0 16px 40px rgba(25, 35, 41, 0.12);
  --shadow-cinnabar: 0 4px 16px rgba(194, 72, 56, 0.28);
  
  --transition: all 0.28s cubic-bezier(0.2, 0.8, 0.2, 1);
  --max-width: 1220px;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink-primary);
  background-color: var(--bg-rice);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  position: relative;
  background-image: 
    radial-gradient(circle at 10% 20%, rgba(38, 91, 84, 0.02) 0%, transparent 40%),
    radial-gradient(circle at 90% 80%, rgba(194, 72, 56, 0.025) 0%, transparent 40%);
}

a {
  color: var(--cinnabar);
  text-decoration: none;
  transition: var(--transition);
}

a:hover {
  color: var(--cinnabar-hover);
}

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

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

:focus-visible {
  outline: 2px solid var(--cinnabar);
  outline-offset: 3px;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.75rem;
}

/* --------------------------------------------------------------------------
   SITE HEADER & NAVIGATION (玉璧清流 · 悬浮画卷导引)
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(249, 247, 242, 0.94);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-silk);
  transition: var(--transition);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.85rem;
  color: var(--ink-primary);
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-decoration: none;
}

.seal-logo-icon {
  width: 38px;
  height: 38px;
  background: var(--cinnabar);
  color: #FFFFFF;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 6px;
  box-shadow: var(--shadow-cinnabar);
  position: relative;
  overflow: hidden;
}

.seal-logo-icon::after {
  content: '';
  position: absolute;
  inset: 1px;
  border: 1px dashed rgba(255, 255, 255, 0.4);
  border-radius: 4px;
}

.brand-motto {
  font-size: 0.75rem;
  color: var(--ink-muted);
  font-weight: 500;
  letter-spacing: 0.08em;
  display: block;
  line-height: 1;
  margin-top: 3px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 2.25rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

.nav-link {
  color: var(--ink-secondary);
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  padding: 0.5rem 0.25rem;
  position: relative;
  transition: var(--transition);
}

.nav-link:hover, .nav-link.active {
  color: var(--cinnabar);
}

.nav-link::before {
  content: '·';
  position: absolute;
  left: -8px;
  color: var(--cinnabar);
  opacity: 0;
  transition: var(--transition);
}

.nav-link:hover::before, .nav-link.active::before {
  opacity: 1;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* 按钮规范：朱砂印泥胶囊按钮与素宣线框按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  padding: 0.8rem 1.75rem;
  border-radius: var(--radius-full);
  min-height: 46px;
  min-width: 44px;
  transition: var(--transition);
  text-align: center;
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: linear-gradient(135deg, #C24838 0%, #A83628 100%);
  color: #FFFFFF;
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: var(--shadow-cinnabar);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #D45342 0%, #BA3F30 100%);
  color: #FFFFFF;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(194, 72, 56, 0.38);
}

.btn-secondary {
  background: var(--bg-pure);
  color: var(--ink-primary);
  border: 1px solid var(--border-silk);
  box-shadow: var(--shadow-ink-sm);
}

.btn-secondary:hover {
  background: var(--bg-silk);
  border-color: var(--border-hover);
  color: var(--cinnabar);
  transform: translateY(-2px);
}

.btn-gold {
  background: linear-gradient(135deg, #B38646 0%, #966E33 100%);
  color: #FFFFFF;
  box-shadow: 0 4px 14px rgba(179, 134, 70, 0.25);
}

.btn-gold:hover {
  background: linear-gradient(135deg, #C59654 0%, #A87D3D 100%);
  color: #FFFFFF;
  transform: translateY(-2px);
}

.nav-toggle-btn {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  color: var(--ink-primary);
  background: var(--bg-silk);
  border: 1px solid var(--border-silk);
}

/* --------------------------------------------------------------------------
   HERO SECTION (天工开卷 · 中轴云峦先锋画报)
   -------------------------------------------------------------------------- */
.hero-section {
  padding: 5rem 0 6rem;
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--border-silk);
}

.hero-landscape-bg {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.55;
}

.hero-wrap {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 980px;
  margin: 0 auto;
}

.hero-stamp-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  background: var(--cinnabar-light);
  color: var(--cinnabar);
  border: 1px solid var(--cinnabar-border);
  font-size: 0.825rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  padding: 0.4rem 1.15rem;
  border-radius: var(--radius-full);
  margin-bottom: 2rem;
  box-shadow: 0 2px 8px rgba(194, 72, 56, 0.08);
}

.hero-headline {
  font-size: 3.4rem;
  line-height: 1.25;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--ink-primary);
  margin-bottom: 1.5rem;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
}

.hero-headline span.accent {
  color: var(--cinnabar);
  position: relative;
  display: inline-block;
}

.hero-headline span.accent::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 6px;
  width: 100%;
  height: 8px;
  background: rgba(194, 72, 56, 0.15);
  z-index: -1;
  border-radius: 4px;
}

.hero-description {
  font-size: 1.25rem;
  line-height: 1.8;
  color: var(--ink-secondary);
  margin: 0 auto 2.75rem;
  max-width: 660px;
}

.hero-actions-center {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.25rem;
  flex-wrap: wrap;
  margin-bottom: 3.5rem;
}

/* 罗盘与八方云网实时遥测台 (Jade Luopan Telemetry Deck) */
.hero-compass-deck {
  background: #FFFFFF;
  border: 1px solid var(--border-silk);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-ink-lg);
  padding: 2.25rem;
  margin-top: 2rem;
  text-align: left;
  position: relative;
}

.hero-compass-deck::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--jade-pine) 0%, var(--gold-bronze) 50%, var(--cinnabar) 100%);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.compass-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border-silk);
  margin-bottom: 1.75rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.compass-title-area {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.compass-pulse-indicator {
  width: 10px;
  height: 10px;
  background-color: var(--jade-pine);
  border-radius: 50%;
  box-shadow: 0 0 0 4px rgba(38, 91, 84, 0.18);
}

.compass-title {
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--ink-primary);
}

.compass-metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
  margin-bottom: 1.75rem;
}

.compass-metric-card {
  background: var(--bg-rice);
  border: 1px solid var(--border-silk);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  position: relative;
}

.metric-kicker {
  font-size: 0.75rem;
  color: var(--ink-muted);
  font-weight: 600;
  letter-spacing: 0.05em;
  margin-bottom: 0.35rem;
}

.metric-num {
  font-size: 1.65rem;
  font-weight: 800;
  color: var(--ink-primary);
  line-height: 1.2;
}

.compass-footer-tags {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 1.25rem;
  border-top: 1px dashed var(--border-silk);
  font-size: 0.85rem;
  color: var(--ink-secondary);
  flex-wrap: wrap;
  gap: 0.75rem;
}

.compass-tags-list {
  display: flex;
  gap: 0.65rem;
  flex-wrap: wrap;
}

.compass-tag-badge {
  background: var(--jade-light);
  color: var(--jade-pine);
  border: 1px solid var(--jade-border);
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-xs);
  font-size: 0.8rem;
  font-weight: 600;
}

/* --------------------------------------------------------------------------
   COMMON SECTION WRAPPER & HEADINGS
   -------------------------------------------------------------------------- */
.section {
  padding: 6rem 0;
  position: relative;
}

.section-alt {
  background-color: var(--bg-silk);
  border-top: 1px solid var(--border-silk);
  border-bottom: 1px solid var(--border-silk);
}

.section-head {
  text-align: center;
  max-width: 740px;
  margin: 0 auto 4rem;
}

.section-stamp-kicker {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  color: var(--cinnabar);
  text-transform: uppercase;
  margin-bottom: 0.85rem;
  border-bottom: 2px solid var(--cinnabar);
  padding-bottom: 2px;
}

.section-title {
  font-size: 2.35rem;
  font-weight: 900;
  letter-spacing: -0.01em;
  line-height: 1.35;
  color: var(--ink-primary);
  margin-bottom: 1.15rem;
}

.section-desc {
  font-size: 1.1rem;
  color: var(--ink-secondary);
  line-height: 1.8;
}

/* --------------------------------------------------------------------------
   MODULE 1: BENEFITS (核心优势 · 三折屏风画卷排版)
   -------------------------------------------------------------------------- */
.benefits-screen-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2.25rem;
}

.benefit-screen-card {
  background: #FFFFFF;
  border: 1px solid var(--border-silk);
  border-radius: var(--radius-lg);
  padding: 2.75rem 2.25rem;
  position: relative;
  transition: var(--transition);
  box-shadow: var(--shadow-ink-sm);
  display: flex;
  flex-direction: column;
}

.benefit-screen-card:hover {
  transform: translateY(-5px);
  border-color: var(--cinnabar-border);
  box-shadow: var(--shadow-ink-md);
}

.benefit-stamp-num {
  font-size: 2.25rem;
  font-weight: 900;
  color: var(--cinnabar);
  line-height: 1;
  margin-bottom: 1.5rem;
  font-feature-settings: "tnum";
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.benefit-stamp-num::after {
  content: '';
  flex-grow: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--cinnabar-border) 0%, transparent 100%);
}

.benefit-screen-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--ink-primary);
  margin-bottom: 1rem;
  line-height: 1.45;
}

.benefit-screen-text {
  font-size: 0.98rem;
  color: var(--ink-secondary);
  line-height: 1.8;
}

/* --------------------------------------------------------------------------
   MODULE 2: AI SUPPORT (百工天成 · 九宫玄玉卡列)
   -------------------------------------------------------------------------- */
.ai-ink-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}

.ai-ink-card {
  background: #FFFFFF;
  border: 1px solid var(--border-silk);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
  transition: var(--transition);
}

.ai-ink-card:hover {
  border-color: var(--jade-pine);
  box-shadow: var(--shadow-ink-md);
  transform: translateY(-3px);
}

.ai-seal-wrap {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: var(--jade-light);
  color: var(--jade-pine);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  padding: 10px;
  border: 1px solid var(--jade-border);
}

.ai-ink-info h3 {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--ink-primary);
  margin-bottom: 0.45rem;
}

.ai-ink-info p {
  font-size: 0.925rem;
  color: var(--ink-secondary);
  line-height: 1.65;
}

/* --------------------------------------------------------------------------
   MODULE 3: FEATURES (榫卯架构 · 四维高规格基石)
   -------------------------------------------------------------------------- */
.features-box-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2.25rem;
}

.feature-box-card {
  background: #FFFFFF;
  border: 1px solid var(--border-silk);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  display: flex;
  gap: 1.75rem;
  align-items: flex-start;
  transition: var(--transition);
  box-shadow: var(--shadow-ink-sm);
}

.feature-box-card:hover {
  border-color: var(--cinnabar);
  box-shadow: var(--shadow-ink-md);
  transform: translateY(-4px);
}

.feature-seal-icon {
  width: 58px;
  height: 58px;
  border-radius: var(--radius-md);
  background: var(--bg-rice);
  border: 1px solid var(--border-silk);
  color: var(--cinnabar);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 14px;
  flex-shrink: 0;
}

.feature-box-content h3 {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--ink-primary);
  margin-bottom: 0.65rem;
}

.feature-box-content p {
  font-size: 0.98rem;
  color: var(--ink-secondary);
  line-height: 1.8;
}

/* --------------------------------------------------------------------------
   MODULE 4: PRICING (三台立案 · 泥金朱砂典藏套系)
   -------------------------------------------------------------------------- */
.pricing-deck-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2.25rem;
  align-items: stretch;
}

.pricing-column-card {
  background: #FFFFFF;
  border: 1px solid var(--border-silk);
  border-radius: var(--radius-lg);
  padding: 3rem 2.25rem;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition);
  box-shadow: var(--shadow-ink-sm);
}

.pricing-column-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-ink-lg);
}

/* 主推畅享档：泥金云锦升维 */
.pricing-column-card.featured {
  border: 2px solid var(--cinnabar);
  box-shadow: 0 12px 36px rgba(194, 72, 56, 0.16);
  background: linear-gradient(180deg, #FFFFFF 0%, #FFFDFB 100%);
  transform: scale(1.03);
  z-index: 2;
}

.pricing-column-card.featured:hover {
  transform: scale(1.03) translateY(-6px);
}

.pricing-cinnabar-seal {
  position: absolute;
  top: -15px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--cinnabar);
  color: #FFFFFF;
  font-size: 0.775rem;
  font-weight: 800;
  padding: 0.35rem 1.25rem;
  border-radius: var(--radius-full);
  letter-spacing: 0.1em;
  white-space: nowrap;
  box-shadow: var(--shadow-cinnabar);
}

.pricing-card-header {
  padding-bottom: 1.75rem;
  border-bottom: 1px solid var(--border-silk);
  margin-bottom: 1.75rem;
}

.pricing-card-title {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--ink-primary);
  margin-bottom: 0.45rem;
}

.pricing-card-target {
  font-size: 0.875rem;
  color: var(--ink-muted);
}

.pricing-price-box {
  margin: 1.5rem 0 0.5rem;
  display: flex;
  align-items: baseline;
  gap: 0.35rem;
}

.price-currency {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--ink-primary);
}

.price-val {
  font-size: 2.75rem;
  font-weight: 900;
  color: var(--ink-primary);
  line-height: 1;
}

.price-cycle {
  font-size: 0.925rem;
  color: var(--ink-muted);
}

.pricing-specs-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 2.5rem;
  flex-grow: 1;
}

.pricing-spec-row {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: 0.95rem;
  color: var(--ink-secondary);
  line-height: 1.6;
}

.pricing-spec-icon {
  width: 18px;
  height: 18px;
  color: var(--cinnabar);
  flex-shrink: 0;
  margin-top: 3px;
}

.pricing-action-wrap {
  margin-top: auto;
}

.pricing-action-wrap .btn {
  width: 100%;
}

/* --------------------------------------------------------------------------
   MODULE 5: STREAMING SUPPORT (光影百戏 · 极乐流媒体画鉴)
   -------------------------------------------------------------------------- */
.streaming-ink-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}

.stream-ink-tile {
  background: #FFFFFF;
  border: 1px solid var(--border-silk);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  transition: var(--transition);
}

.stream-ink-tile:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-ink-md);
}

.stream-tile-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.85rem;
}

.stream-tile-name {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--ink-primary);
}

.stream-tile-badge {
  font-size: 0.75rem;
  background: var(--bg-silk);
  color: var(--ink-secondary);
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-xs);
  font-weight: 600;
  border: 1px solid var(--border-silk);
}

.stream-tile-desc {
  font-size: 0.925rem;
  color: var(--ink-secondary);
  line-height: 1.7;
}

/* --------------------------------------------------------------------------
   MODULE 6: SCENARIOS (四时雅叙 · 真实生活图卷)
   -------------------------------------------------------------------------- */
.scenarios-ink-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2.25rem;
}

.scenario-ink-card {
  background: #FFFFFF;
  border: 1px solid var(--border-silk);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  box-shadow: var(--shadow-ink-sm);
  position: relative;
}

.scenario-ink-card:hover {
  box-shadow: var(--shadow-ink-md);
  border-color: var(--border-hover);
}

.scenario-card-header {
  margin-bottom: 1.15rem;
}

.scenario-card-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--ink-primary);
  margin-bottom: 0.55rem;
}

.scenario-tag-device {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--jade-pine);
  background: var(--jade-light);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-xs);
  border: 1px solid var(--jade-border);
}

.scenario-card-desc {
  font-size: 0.98rem;
  color: var(--ink-secondary);
  line-height: 1.8;
}

/* --------------------------------------------------------------------------
   MODULE 7: FAQ (竹简折扇 · 常见问答手风琴)
   -------------------------------------------------------------------------- */
.faq-scroll-box {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.faq-fan-drawer {
  background: #FFFFFF;
  border: 1px solid var(--border-silk);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
  box-shadow: var(--shadow-ink-sm);
}

.faq-fan-drawer:hover {
  border-color: var(--border-hover);
}

.faq-fan-drawer[open] {
  border-color: var(--cinnabar-border);
  box-shadow: var(--shadow-ink-md);
}

.faq-fan-summary {
  padding: 1.4rem 1.75rem;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--ink-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  list-style: none;
  user-select: none;
}

.faq-fan-summary::-webkit-details-marker {
  display: none;
}

.faq-seal-arrow {
  width: 22px;
  height: 22px;
  color: var(--ink-muted);
  transition: transform 0.25s ease;
  flex-shrink: 0;
}

.faq-fan-drawer[open] .faq-seal-arrow {
  transform: rotate(180deg);
  color: var(--cinnabar);
}

.faq-fan-answer {
  padding: 0 1.75rem 1.75rem;
  font-size: 0.98rem;
  color: var(--ink-secondary);
  line-height: 1.8;
  border-top: 1px solid transparent;
}

.faq-fan-drawer[open] .faq-fan-answer {
  border-top-color: var(--border-silk);
  padding-top: 1.15rem;
}

/* --------------------------------------------------------------------------
   FINAL CTA (远山暮雪 · 登高揽胜宽幅行动屏)
   -------------------------------------------------------------------------- */
.final-cta-section {
  padding: 6rem 0;
  background: linear-gradient(135deg, #141D22 0%, #1A282D 100%);
  color: #FFFFFF;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.final-cta-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 50% 30%, rgba(194, 72, 56, 0.15) 0%, transparent 70%);
  pointer-events: none;
}

.final-cta-content {
  position: relative;
  z-index: 1;
  max-width: 720px;
  margin: 0 auto;
}

.final-cta-title {
  font-size: 2.5rem;
  font-weight: 900;
  letter-spacing: 0.02em;
  margin-bottom: 1.25rem;
  color: #FFFFFF;
}

.final-cta-desc {
  font-size: 1.2rem;
  color: #A0B0BA;
  margin-bottom: 2.75rem;
  line-height: 1.8;
}

.final-cta-section .btn-primary {
  padding: 1rem 2.75rem;
  font-size: 1.1rem;
}

/* --------------------------------------------------------------------------
   SITE FOOTER (卷末落款 · 东方规制页脚)
   -------------------------------------------------------------------------- */
.site-footer {
  background: #FFFFFF;
  border-top: 1px solid var(--border-silk);
  padding: 4.5rem 0 2.5rem;
  color: var(--ink-secondary);
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 2.5rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid var(--border-silk);
  flex-wrap: wrap;
}

.footer-brand {
  max-width: 400px;
}

.footer-brand-title {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--ink-primary);
  margin-bottom: 0.85rem;
}

.footer-brand-desc {
  font-size: 0.925rem;
  line-height: 1.8;
  color: var(--ink-secondary);
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
  align-items: center;
}

.footer-link {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--ink-secondary);
  transition: var(--transition);
}

.footer-link:hover {
  color: var(--cinnabar);
}

.footer-bottom {
  padding-top: 2.25rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  font-size: 0.85rem;
  color: var(--ink-muted);
  text-align: center;
}

.footer-disclosure {
  background: var(--bg-rice);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-silk);
  color: var(--ink-secondary);
  font-size: 0.85rem;
  max-width: 640px;
  margin: 0 auto;
}

/* --------------------------------------------------------------------------
   GUIDES / BLOG INDEX PAGE (书斋索引 · 六部指南典藏)
   -------------------------------------------------------------------------- */
.page-header {
  padding: 4.5rem 0 3.5rem;
  background: var(--bg-silk);
  border-bottom: 1px solid var(--border-silk);
}

.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.875rem;
  color: var(--ink-muted);
  margin-bottom: 1.5rem;
}

.breadcrumb-separator {
  color: var(--border-hover);
}

.page-title {
  font-size: 2.5rem;
  font-weight: 900;
  color: var(--ink-primary);
  margin-bottom: 0.85rem;
  line-height: 1.35;
}

.page-subtitle {
  font-size: 1.15rem;
  color: var(--ink-secondary);
  max-width: 760px;
  line-height: 1.8;
}

.guides-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2.25rem;
  padding: 4.5rem 0;
}

.guide-card {
  background: #FFFFFF;
  border: 1px solid var(--border-silk);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  box-shadow: var(--shadow-ink-sm);
}

.guide-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-ink-lg);
  border-color: var(--cinnabar-border);
}

.guide-card-media {
  background: var(--bg-rice);
  border-bottom: 1px solid var(--border-silk);
  aspect-ratio: 16 / 9;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}

.guide-card-body {
  padding: 2rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.guide-meta {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  font-size: 0.825rem;
  color: var(--ink-muted);
  margin-bottom: 0.85rem;
}

.guide-card-title {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--ink-primary);
  line-height: 1.45;
  margin-bottom: 0.85rem;
}

.guide-card-title a {
  color: inherit;
}

.guide-card-title a:hover {
  color: var(--cinnabar);
}

.guide-card-excerpt {
  font-size: 0.95rem;
  color: var(--ink-secondary);
  line-height: 1.75;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.guide-read-link {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--cinnabar);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.guide-read-link:hover {
  color: var(--cinnabar-hover);
  text-decoration: underline;
}

/* --------------------------------------------------------------------------
   ARTICLE DETAIL PAGE (宣纸竹简 · 典籍研读版式)
   -------------------------------------------------------------------------- */
.article-container {
  max-width: 880px;
  margin: 0 auto;
  padding: 4rem 1.75rem 6rem;
}

.article-header {
  margin-bottom: 3rem;
  padding-bottom: 2.25rem;
  border-bottom: 1px solid var(--border-silk);
}

.article-h1 {
  font-size: 2.45rem;
  line-height: 1.35;
  font-weight: 900;
  color: var(--ink-primary);
  margin-bottom: 1.25rem;
  letter-spacing: -0.01em;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  font-size: 0.9rem;
  color: var(--ink-muted);
  flex-wrap: wrap;
}

.article-body {
  font-size: 1.08rem;
  line-height: 1.9;
  color: var(--ink-primary);
}

.article-lead {
  font-size: 1.2rem;
  line-height: 1.85;
  color: var(--ink-secondary);
  background: var(--bg-silk);
  padding: 1.75rem 2rem;
  border-left: 5px solid var(--cinnabar);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin-bottom: 3rem;
}

.article-body h2 {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--ink-primary);
  margin: 3.25rem 0 1.35rem;
  padding-bottom: 0.65rem;
  border-bottom: 2px solid var(--border-silk);
  line-height: 1.45;
}

.article-body h3 {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--ink-primary);
  margin: 2rem 0 1rem;
  line-height: 1.5;
}

.article-body p {
  margin-bottom: 1.65rem;
  color: #2D3A40;
}

.article-body ul, .article-body ol {
  margin: 0 0 1.65rem 2rem;
  color: #2D3A40;
}

.article-body li {
  margin-bottom: 0.65rem;
}

.article-callout {
  background: #FFFBF9;
  border: 1px solid var(--cinnabar-border);
  border-radius: var(--radius-md);
  padding: 1.5rem 1.75rem;
  margin: 2rem 0;
}

.article-callout-title {
  font-weight: 800;
  font-size: 1.05rem;
  color: var(--cinnabar);
  margin-bottom: 0.45rem;
}

.article-callout p {
  margin-bottom: 0;
  font-size: 0.98rem;
  color: #6A2218;
}

.article-table-wrap {
  overflow-x: auto;
  margin: 2.25rem 0;
  border: 1px solid var(--border-silk);
  border-radius: var(--radius-md);
  background: #FFFFFF;
}

.article-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
  text-align: left;
}

.article-table th {
  background: var(--bg-silk);
  padding: 1rem 1.25rem;
  font-weight: 700;
  color: var(--ink-primary);
  border-bottom: 1px solid var(--border-silk);
}

.article-table td {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border-silk);
  color: var(--ink-secondary);
}

.article-table tr:last-child td {
  border-bottom: none;
}

.article-faq-section {
  margin: 4rem 0 2.5rem;
  padding-top: 2.5rem;
  border-top: 2px dashed var(--border-silk);
}

.article-cta-box {
  margin: 4rem 0 2.5rem;
  background: linear-gradient(135deg, #141D22 0%, #1F2E35 100%);
  color: #FFFFFF;
  border-radius: var(--radius-lg);
  padding: 3rem 2.5rem;
  text-align: center;
  box-shadow: var(--shadow-ink-lg);
}

.article-cta-box h3 {
  font-size: 1.65rem;
  color: #FFFFFF;
  margin-bottom: 0.85rem;
  font-weight: 800;
}

.article-cta-box p {
  color: #A0B0BA;
  font-size: 1.05rem;
  margin-bottom: 2rem;
}

.article-cta-box .btn-primary {
  padding: 0.95rem 2.5rem;
}

.article-back-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 3.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-silk);
  flex-wrap: wrap;
  gap: 1.25rem;
}

/* --------------------------------------------------------------------------
   LEGAL & SITEMAP PAGES (典章合规 · 澄心卷宗)
   -------------------------------------------------------------------------- */
.legal-container {
  max-width: 860px;
  margin: 0 auto;
  padding: 4.5rem 1.75rem 6.5rem;
}

.legal-header {
  margin-bottom: 2.75rem;
  padding-bottom: 1.75rem;
  border-bottom: 1px solid var(--border-silk);
}

.legal-title {
  font-size: 2.35rem;
  font-weight: 900;
  color: var(--ink-primary);
  margin-bottom: 0.85rem;
}

.legal-meta {
  font-size: 0.9rem;
  color: var(--ink-muted);
}

.legal-content {
  font-size: 1.05rem;
  line-height: 1.85;
  color: #2D3A40;
}

.legal-content h2 {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--ink-primary);
  margin: 2.5rem 0 1.15rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border-silk);
}

.legal-content p {
  margin-bottom: 1.45rem;
}

.legal-content ul {
  margin: 0 0 1.65rem 1.75rem;
}

.legal-content li {
  margin-bottom: 0.65rem;
}

.sitemap-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2.5rem;
  margin-top: 2.5rem;
}

.sitemap-col {
  background: #FFFFFF;
  border: 1px solid var(--border-silk);
  border-radius: var(--radius-md);
  padding: 2.25rem;
  box-shadow: var(--shadow-ink-sm);
}

.sitemap-col h2 {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--ink-primary);
  margin-bottom: 1.35rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--border-silk);
}

.sitemap-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.sitemap-list a {
  color: var(--ink-secondary);
  font-size: 0.98rem;
}

.sitemap-list a:hover {
  color: var(--cinnabar);
  text-decoration: underline;
}

/* --------------------------------------------------------------------------
   MOBILE STICKY BOTTOM BAR (锦囊吸底 · 浮动玉璧快捷栏)
   -------------------------------------------------------------------------- */
.mobile-sticky-cta {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 99;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(14px);
  border-top: 1px solid var(--border-silk);
  padding: 0.85rem 1.25rem;
  box-shadow: 0 -6px 20px rgba(25, 35, 41, 0.08);
  transition: transform 0.28s ease;
}

.mobile-sticky-cta.visible {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.mobile-sticky-info {
  display: flex;
  flex-direction: column;
}

.mobile-sticky-brand {
  font-weight: 800;
  font-size: 0.95rem;
  color: var(--ink-primary);
}

.mobile-sticky-sub {
  font-size: 0.775rem;
  color: var(--ink-muted);
}

.mobile-sticky-cta .btn {
  padding: 0.65rem 1.35rem;
  font-size: 0.9rem;
  flex-shrink: 0;
}

/* --------------------------------------------------------------------------
   RESPONSIVE DESIGN (全设备适配与横竖屏响应)
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .hero-headline {
    font-size: 2.85rem;
  }
  
  .pricing-deck-grid,
  .benefits-screen-grid,
  .guides-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .pricing-column-card.featured {
    transform: none;
  }
  
  .pricing-column-card.featured:hover {
    transform: translateY(-6px);
  }
  
  .ai-ink-grid,
  .streaming-ink-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .compass-metrics-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .site-nav {
    display: none;
    position: absolute;
    top: 76px;
    left: 0;
    right: 0;
    background: #FFFFFF;
    border-bottom: 1px solid var(--border-silk);
    flex-direction: column;
    padding: 1.75rem;
    box-shadow: var(--shadow-ink-lg);
  }
  
  .site-nav.open {
    display: flex;
  }
  
  .nav-links {
    flex-direction: column;
    width: 100%;
    align-items: stretch;
    gap: 0.65rem;
  }
  
  .nav-link {
    padding: 0.85rem 0.5rem;
  }
  
  .nav-toggle-btn {
    display: flex;
  }
  
  .hero-headline {
    font-size: 2.25rem;
  }
  
  .pricing-deck-grid,
  .benefits-screen-grid,
  .features-box-grid,
  .scenarios-ink-grid,
  .guides-grid,
  .sitemap-grid,
  .ai-ink-grid,
  .streaming-ink-grid {
    grid-template-columns: 1fr;
  }
  
  .hero-compass-deck {
    padding: 1.5rem;
  }
  
  .footer-top {
    flex-direction: column;
    gap: 1.75rem;
  }
  
  .footer-nav {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }
  
  .article-h1 {
    font-size: 1.95rem;
  }
}

@media (max-width: 480px) {
  .hero-headline {
    font-size: 1.95rem;
  }
  
  .hero-actions-center {
    flex-direction: column;
    align-items: stretch;
  }
  
  .hero-actions-center .btn {
    width: 100%;
  }
  
  .compass-metrics-grid {
    grid-template-columns: 1fr;
  }
}

/* --------------------------------------------------------------------------
   INTERACTIVE ENHANCEMENTS: 罗盘印玺切换 · 杏林算筹推演 · 视听算力雅集
   -------------------------------------------------------------------------- */
.compass-region-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
  padding: 0.75rem 1rem;
  background: var(--bg-rice);
  border: 1px solid var(--border-silk);
  border-radius: var(--radius-md);
}

.compass-region-label {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--ink-secondary);
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.compass-region-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.compass-seal-btn {
  padding: 0.38rem 0.9rem;
  border-radius: var(--radius-xs);
  font-size: 0.825rem;
  font-weight: 700;
  color: var(--ink-secondary);
  background: #FFFFFF;
  border: 1px solid var(--border-silk);
  transition: var(--transition);
  letter-spacing: 0.04em;
}

.compass-seal-btn:hover {
  border-color: var(--cinnabar-border);
  color: var(--cinnabar);
}

.compass-seal-btn.active {
  background: var(--cinnabar);
  color: #FFFFFF;
  border-color: var(--cinnabar);
  box-shadow: 0 2px 8px rgba(194, 72, 56, 0.25);
}

.compass-route-note {
  font-size: 0.85rem;
  color: var(--jade-pine);
  background: var(--jade-light);
  border: 1px solid var(--jade-border);
  border-radius: var(--radius-sm);
  padding: 0.65rem 1rem;
  margin-bottom: 1.25rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}

/* 杏林算筹 · 流量与案几推演器 */
.abacus-estimator-box {
  background: #FFFFFF;
  border: 1px solid var(--border-silk);
  border-radius: var(--radius-lg);
  padding: 2rem 2.25rem;
  margin-bottom: 3rem;
  box-shadow: var(--shadow-ink-sm);
  position: relative;
}

.abacus-estimator-box::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: 4px;
  background: linear-gradient(180deg, var(--cinnabar) 0%, var(--gold-bronze) 100%);
  border-radius: var(--radius-lg) 0 0 var(--radius-lg);
}

.abacus-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.abacus-title {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--ink-primary);
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.abacus-title-seal {
  background: var(--gold-light);
  color: var(--gold-bronze);
  border: 1px solid #E6D2B5;
  font-size: 0.75rem;
  padding: 0.15rem 0.55rem;
  border-radius: var(--radius-xs);
  font-weight: 700;
}

.abacus-result-banner {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  font-size: 0.925rem;
  color: var(--ink-secondary);
}

.abacus-result-highlight {
  font-weight: 800;
  color: var(--cinnabar);
  background: var(--cinnabar-light);
  border: 1px solid var(--cinnabar-border);
  padding: 0.3rem 0.85rem;
  border-radius: var(--radius-full);
}

.abacus-chips-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.85rem;
}

.abacus-chip-btn {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.25rem;
  padding: 0.9rem 1.1rem;
  border-radius: var(--radius-md);
  background: var(--bg-rice);
  border: 1px solid var(--border-silk);
  text-align: left;
  transition: var(--transition);
}

.abacus-chip-btn:hover {
  border-color: var(--cinnabar-border);
}

.abacus-chip-btn.active {
  background: var(--cinnabar-light);
  border-color: var(--cinnabar);
  box-shadow: 0 3px 10px rgba(194, 72, 56, 0.1);
}

.abacus-chip-name {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--ink-primary);
}

.abacus-chip-btn.active .abacus-chip-name {
  color: var(--cinnabar);
}

.abacus-chip-meta {
  font-size: 0.775rem;
  color: var(--ink-muted);
}

.pricing-column-card.recommended-pulse {
  border-color: var(--gold-bronze);
  box-shadow: 0 14px 38px rgba(179, 134, 70, 0.22);
}

/* 视听与算力雅集分卷栏 */
.yaji-subhead-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  margin: 2.5rem 0 1.5rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-silk);
}

.yaji-subhead-bar:first-of-type {
  margin-top: 0;
}

.yaji-subhead-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--ink-primary);
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.yaji-subhead-badge {
  font-size: 0.775rem;
  font-weight: 700;
  padding: 0.2rem 0.65rem;
  border-radius: var(--radius-xs);
  background: var(--jade-light);
  color: var(--jade-pine);
  border: 1px solid var(--jade-border);
}

.yaji-filter-tabs {
  display: inline-flex;
  background: var(--bg-rice);
  padding: 0.3rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-silk);
  gap: 0.35rem;
  margin-top: 1.25rem;
}

.yaji-filter-btn {
  padding: 0.4rem 1.1rem;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--ink-secondary);
  transition: var(--transition);
}

.yaji-filter-btn.active {
  background: var(--cinnabar);
  color: #FFFFFF;
}

@media (max-width: 900px) {
  .abacus-chips-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .abacus-chips-grid {
    grid-template-columns: 1fr;
  }
}

/* Reduced Motion */
@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;
  }
}