/* ==========================================================================
   沈阳锐米科技有限公司 (www.ruime.net) — 官方设计系统样式表
   Responsive Design | Desktop / Tablet / Mobile
   ========================================================================== */

:root {
  --bg-page: #f8fafc;
  --bg-surface: #ffffff;
  --bg-subtle: #f1f5f9;
  --bg-dark: #090d16;
  --bg-dark-card: #131b2e;

  --text-primary: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --text-on-dark: #f8fafc;

  --border-light: #e2e8f0;
  --border-hover: #cbd5e1;

  /* 默认品牌色（锐米科技蓝） */
  --brand-primary: #2563eb;
  --brand-primary-dark: #1d4ed8;
  --brand-primary-light: #eff6ff;
  --brand-accent: #0ea5e9;
  --brand-gradient: linear-gradient(135deg, #1d4ed8 0%, #2563eb 50%, #0284c7 100%);
  --brand-glow: rgba(37, 99, 235, 0.14);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 10px 30px -6px rgba(15, 23, 42, 0.06);
  --shadow-lg: 0 24px 48px -12px rgba(15, 23, 42, 0.10);

  --container-max: 1200px;
  --header-height: 72px;
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Inter", system-ui, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

/* 趣自驾专属主题色（山海青蓝 + 活力橙点缀，呼应正式版越野车图标） */
body.theme-roadbook {
  --brand-primary: #0284c7;
  --brand-primary-dark: #0369a1;
  --brand-primary-light: #f0f9ff;
  --brand-accent: #ea580c;
  --brand-gradient: linear-gradient(135deg, #0369a1 0%, #0284c7 55%, #0d9488 100%);
  --brand-glow: rgba(2, 132, 199, 0.16);
}

/* 小马朗读专属主题色（自然治愈系翠竹绿） */
body.theme-mintread {
  --brand-primary: #16a34a;
  --brand-primary-dark: #15803d;
  --brand-primary-light: #f0fdf4;
  --brand-accent: #22c55e;
  --brand-gradient: linear-gradient(135deg, #15803d 0%, #16a34a 55%, #0d9488 100%);
  --brand-glow: rgba(22, 163, 74, 0.14);
  --bg-page: #fafaf8;
}

/* 声印输入法专属主题色（声波流光蓝紫） */
body.theme-shengyin {
  --brand-primary: #4f46e5;
  --brand-primary-dark: #4338ca;
  --brand-primary-light: #eef2ff;
  --brand-accent: #06b6d4;
  --brand-gradient: linear-gradient(135deg, #0ea5e9 0%, #4f46e5 55%, #7c3aed 100%);
  --brand-glow: rgba(79, 70, 229, 0.15);
}

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

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-page);
  color: var(--text-primary);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a {
  color: var(--brand-primary);
  text-decoration: none;
  transition: color 0.2s ease, opacity 0.2s ease;
}

a:hover {
  color: var(--brand-primary-dark);
}

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

svg.icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  display: inline-block;
  vertical-align: middle;
}

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

/* ==========================================================================
   顶部导航栏 (Sticky Header)
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(226, 232, 240, 0.8);
}

.site-header .container {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  font-size: 1.15rem;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.brand-logo:hover {
  color: var(--text-primary);
}

.brand-mark {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background: var(--brand-gradient);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.98rem;
  box-shadow: 0 4px 12px var(--brand-glow);
}

.brand-logo img {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  object-fit: cover;
  border: 1px solid var(--border-light);
}

.brand-logo img.logo-round {
  border-radius: 50%;
  border: none;
  background: transparent;
}

.brand-divider {
  color: var(--border-hover);
  font-weight: 300;
  margin: 0 2px;
}

.brand-sub {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-muted);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.site-nav a {
  color: var(--text-secondary);
  font-size: 0.92rem;
  font-weight: 500;
  padding: 6px 2px;
  position: relative;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--brand-primary);
}

.site-nav a.active::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 2px;
  border-radius: 2px;
  background: var(--brand-primary);
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px !important;
  border-radius: 999px;
  background: var(--text-primary);
  color: #ffffff !important;
  font-weight: 600 !important;
  font-size: 0.86rem !important;
  transition: transform 0.2s ease, background 0.2s ease !important;
}

.nav-cta:hover {
  background: var(--brand-primary);
  transform: translateY(-1px);
}

.mobile-menu-btn {
  display: none;
  align-items: center;
  gap: 6px;
  background: none;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 7px 12px;
  font-size: 0.88rem;
  color: var(--text-primary);
  cursor: pointer;
}

.mobile-menu-btn svg {
  width: 16px;
  height: 16px;
  stroke: currentColor;
  stroke-width: 2;
  fill: none;
  stroke-linecap: round;
}

/* ==========================================================================
   面包屑导航 (Breadcrumbs)
   ========================================================================== */
.breadcrumb-bar {
  background: var(--bg-subtle);
  border-bottom: 1px solid var(--border-light);
  padding: 10px 0;
  font-size: 0.83rem;
  color: var(--text-muted);
}

.breadcrumb-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.breadcrumb-list li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--border-hover);
}

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

.breadcrumb-list a:hover {
  color: var(--brand-primary);
}

/* ==========================================================================
   Hero 区域 (克制留白，去除方格纸与AI光晕)
   ========================================================================== */
.hero {
  position: relative;
  padding: 64px 0 56px;
  background-color: #ffffff;
  border-bottom: 1px solid var(--border-light);
}

.app-hero-wrap {
  max-width: 820px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.22fr 0.98fr;
  gap: 52px;
  align-items: center;
}

.hero-app-header,
.app-hero-identity {
  display: flex;
  align-items: center;
  gap: 22px;
  margin-bottom: 22px;
}

.hero-app-logo,
.app-hero-logo {
  width: 84px;
  height: 84px;
  border-radius: 20px;
  object-fit: cover;
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(15, 23, 42, 0.08);
  flex-shrink: 0;
  background: #fff;
}

.hero-centered {
  padding: 68px 0 60px;
  text-align: center;
}

.hero-centered-inner {
  max-width: 740px;
  margin: 0 auto;
}

.hero-centered .download-matrix {
  justify-content: center;
}

.hero-centered .hero-desc {
  margin-left: auto;
  margin-right: auto;
  max-width: 640px;
}

.hero-title {
  font-size: clamp(1.95rem, 3.4vw, 2.65rem);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.hero-title .highlight {
  color: var(--text-primary);
}

.hero-subtitle {
  font-size: 1.08rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.hero-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: 28px;
  max-width: 680px;
  line-height: 1.75;
}

/* 下载按钮矩阵 */
.download-matrix {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 20px;
}

.dl-btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 11px 20px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.93rem;
  transition: background-color 0.18s ease, border-color 0.18s ease;
  cursor: pointer;
  border: 1px solid transparent;
}

.dl-btn svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.dl-btn-primary {
  background: var(--brand-primary);
  color: #ffffff;
}

.dl-btn-primary:hover {
  background: var(--brand-primary-dark);
  color: #ffffff;
}

.dl-btn-dark {
  background: #0f172a;
  color: #ffffff;
}

.dl-btn-dark:hover {
  background: #1e293b;
  color: #ffffff;
}

.dl-btn-harmony {
  background: #ffffff;
  color: #0f172a;
  border-color: #cbd5e1;
}

.dl-btn-harmony:hover {
  border-color: #94a3b8;
  color: #0f172a;
  background: #f8fafc;
}

.dl-btn-outline {
  background: #ffffff;
  color: var(--text-primary);
  border-color: var(--border-hover);
}

.dl-btn-outline:hover {
  border-color: var(--text-secondary);
  color: var(--text-primary);
  background: #f8fafc;
}

.dl-btn-meta {
  display: flex;
  flex-direction: column;
  line-height: 1.22;
  text-align: left;
}

.dl-btn-meta small {
  font-size: 0.71rem;
  font-weight: 500;
  opacity: 0.78;
}

.dl-btn-meta span {
  font-size: 0.93rem;
  font-weight: 700;
}

.hero-meta-note {
  font-size: 0.82rem;
  color: var(--text-muted);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px;
  padding-top: 6px;
}

.hero-meta-note span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.hero-meta-note span + span::before {
  content: "";
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: #cbd5e1;
  margin-right: 12px;
}

/* ==========================================================================
   首屏右侧 2x2 核心亮点数字看板 (Hero Stats Grid — 简洁直观零冗余)
   ========================================================================== */
.hero-stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.hero-stat-tile {
  background: rgba(255, 255, 255, 0.96);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 24px 22px;
  box-shadow: var(--shadow-md);
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.hero-stat-tile:hover {
  transform: translateY(-2px);
  border-color: var(--border-hover);
}

.hero-stat-num {
  font-size: 1.75rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  background: var(--brand-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1.2;
  margin-bottom: 6px;
}

.hero-stat-title {
  font-size: 0.94rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.hero-stat-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.about-banner {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 44px 48px;
  box-shadow: var(--shadow-sm);
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 44px;
  align-items: center;
}

.about-highlights {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.about-mini-card {
  background: var(--bg-page);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 18px 20px;
}

.about-mini-card strong {
  display: block;
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.about-mini-card span {
  font-size: 0.82rem;
  color: var(--text-muted);
}

code {
  font-family: var(--font-mono);
  font-size: 0.82em;
  background: var(--bg-subtle);
  color: var(--text-secondary);
  padding: 2px 6px;
  border-radius: 4px;
}

/* ==========================================================================
   通用章节容器与标题 (Sections)
   ========================================================================== */
.section {
  padding: 80px 0;
}

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

.section-dark {
  background: var(--bg-dark);
  color: var(--text-on-dark);
}

.section-header {
  max-width: 720px;
  margin: 0 auto 52px;
  text-align: center;
}

.section-eyebrow {
  display: inline-block;
  font-size: 0.76rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--brand-primary);
  margin-bottom: 10px;
}

.section-title {
  font-size: clamp(1.6rem, 2.8vw, 2.2rem);
  font-weight: 800;
  letter-spacing: -0.025em;
  margin-bottom: 12px;
  color: inherit;
}

.section-desc {
  font-size: 1rem;
  color: var(--text-muted);
  line-height: 1.7;
}

.section-dark .section-desc {
  color: #94a3b8;
}

/* ==========================================================================
   关键指标统计条 (Stats Bar)
   ========================================================================== */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: -28px;
  position: relative;
  z-index: 10;
}

.stat-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 24px 20px;
  box-shadow: var(--shadow-md);
  text-align: left;
}

.stat-value {
  font-size: 1.85rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 6px;
}

.stat-label {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--brand-primary);
}

.stat-sub {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ==========================================================================
   首页产品矩阵展示卡 (App Matrix Cards)
   ========================================================================== */
.app-showcase-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(330px, 1fr));
  gap: 24px;
}

.app-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 30px;
  box-shadow: var(--shadow-sm);
  transition: all 0.25s ease;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.app-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  border-color: var(--border-hover);
}

.app-card-top {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-bottom: 20px;
}

.app-card-icon-link {
  display: inline-flex;
  flex-shrink: 0;
  border-radius: 15px;
  transition: transform 0.2s ease;
}

.app-card-icon-link:hover {
  transform: scale(1.04);
}

.app-card-icon {
  width: 64px;
  height: 64px;
  border-radius: 15px;
  object-fit: cover;
  border: 1px solid var(--border-light);
  flex-shrink: 0;
}

.app-card-icon.logo-round,
.hero-app-logo.logo-round,
.app-hero-logo.logo-round,
.bottom-cta-logo.logo-round {
  border-radius: 50%;
  border: none;
  background: transparent;
  padding: 0;
  box-shadow: 0 8px 20px rgba(15, 23, 42, 0.12);
}

.app-card-title-group h3 {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 3px;
  letter-spacing: -0.01em;
}

.app-card-slogan {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--brand-primary);
}

.app-card-summary {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 20px;
  line-height: 1.7;
}

.app-card-highlights {
  list-style: none;
  margin-bottom: 24px;
  display: grid;
  gap: 10px;
}

.app-card-highlights li {
  font-size: 0.88rem;
  color: var(--text-secondary);
  padding-left: 16px;
  position: relative;
  line-height: 1.6;
}

.app-card-highlights li::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--brand-primary);
  position: absolute;
  left: 0;
  top: 9px;
}

.tag-group {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.tag {
  font-size: 0.76rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 6px;
  background: var(--bg-subtle);
  color: var(--text-secondary);
}

.tag.tag-harmony {
  background: #fff1f2;
  color: #be123c;
}

.tag.tag-ai {
  background: var(--brand-primary-light);
  color: var(--brand-primary-dark);
}

.app-card-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 20px;
  border-top: 1px solid var(--border-light);
  gap: 12px;
}

.btn-link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 700;
  font-size: 0.92rem;
  color: var(--brand-primary);
}

.btn-link-arrow:hover {
  gap: 10px;
}

/* ==========================================================================
   功能特性网格 (Feature Cards Grid — 极简线性 SVG 图标 + 编号设计)
   ========================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 30px 28px;
  transition: all 0.22s ease;
  display: flex;
  flex-direction: column;
}

.feature-box:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.feature-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
}

.feature-icon {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background: var(--brand-primary-light);
  color: var(--brand-primary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.feature-icon svg {
  width: 22px;
  height: 22px;
  stroke: currentColor;
  stroke-width: 1.8;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.feature-index {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  color: #94a3b8;
  letter-spacing: 0.04em;
}

.feature-box h3 {
  font-size: 1.12rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.feature-box p {
  font-size: 0.93rem;
  color: var(--text-secondary);
  margin-bottom: 0;
  line-height: 1.72;
}

.feature-box ul {
  list-style: none;
  display: grid;
  gap: 7px;
  margin-top: auto;
  padding-top: 12px;
  border-top: 1px dashed var(--border-light);
}

.feature-box ul li {
  font-size: 0.84rem;
  color: var(--text-muted);
  padding-left: 14px;
  position: relative;
  line-height: 1.55;
}

.feature-box ul li::before {
  content: "";
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--brand-primary);
  position: absolute;
  left: 0;
  top: 8px;
}

/* ==========================================================================
   产品规格与参数表 (Specification & Comparison Tables)
   ========================================================================== */
.table-wrapper {
  overflow-x: auto;
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.spec-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.92rem;
}

.spec-table th,
.spec-table td {
  padding: 16px 22px;
  border-bottom: 1px solid var(--border-light);
  vertical-align: top;
}

.spec-table thead th {
  background: var(--bg-subtle);
  font-weight: 700;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--text-secondary);
  white-space: nowrap;
}

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

.spec-table tbody tr:hover {
  background: rgba(241, 245, 249, 0.45);
}

.spec-table td:first-child {
  font-weight: 700;
  color: var(--text-primary);
  width: 20%;
  min-width: 150px;
}

/* ==========================================================================
   分步使用流程 (Workflow Steps)
   ========================================================================== */
.workflow-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.step-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  position: relative;
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 3px 10px;
  border-radius: 6px;
  background: var(--brand-primary-light);
  color: var(--brand-primary-dark);
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 0.8rem;
  margin-bottom: 14px;
}

.step-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.step-card p {
  font-size: 0.89rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ==========================================================================
   常见问答模块 (FAQ)
   ========================================================================== */
.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: grid;
  gap: 14px;
}

.faq-item {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 20px 26px;
  transition: border-color 0.2s ease;
}

.faq-item[open] {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-sm);
}

.faq-question {
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--text-primary);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

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

.faq-question::after {
  content: "+";
  font-size: 1.3rem;
  font-weight: 400;
  color: var(--text-muted);
  flex-shrink: 0;
}

.faq-item[open] .faq-question::after {
  content: "−";
  color: var(--brand-primary);
}

.faq-answer {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--border-light);
  font-size: 0.93rem;
  color: var(--text-secondary);
  line-height: 1.75;
}

.faq-answer p + p {
  margin-top: 8px;
}

/* ==========================================================================
   对话气泡对比卡 & 适用场景卡片 (Compare Cards & Scene Cards — 去表格化升级)
   ========================================================================== */
.compare-grid,
.scene-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.compare-card,
.scene-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: all 0.22s ease;
}

.compare-card:hover,
.scene-card:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.compare-card-header,
.scene-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-light);
}

.compare-card-header h3,
.scene-card-header h3 {
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}

.compare-badge {
  font-size: 0.76rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--brand-primary-light);
  color: var(--brand-primary-dark);
  white-space: nowrap;
}

.compare-bubble-before {
  background: var(--bg-subtle);
  border: 1px solid var(--border-light);
  border-radius: 12px;
  padding: 14px 18px;
}

.compare-bubble-after {
  background: var(--brand-primary-light);
  border: 1px solid rgba(79, 70, 229, 0.16);
  border-radius: 12px;
  padding: 16px 18px;
  flex: 1;
}

.bubble-label {
  font-size: 0.78rem;
  font-weight: 700;
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.bubble-label svg {
  width: 15px;
  height: 15px;
  stroke: currentColor;
  stroke-width: 2;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
  flex-shrink: 0;
}

.compare-bubble-before .bubble-label {
  color: var(--text-muted);
}

.compare-bubble-after .bubble-label {
  color: var(--brand-primary-dark);
}

.compare-bubble-before p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin: 0;
}

.compare-bubble-after p {
  font-size: 0.92rem;
  color: var(--text-primary);
  font-weight: 500;
  line-height: 1.68;
  margin: 0;
}

.scene-pain {
  background: var(--bg-subtle);
  border-left: 3px solid #94a3b8;
  border-radius: 0 10px 10px 0;
  padding: 12px 16px;
  font-size: 0.89rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.scene-pain strong,
.scene-solution strong {
  display: block;
  font-size: 0.78rem;
  margin-bottom: 4px;
}

.scene-pain strong {
  color: var(--text-muted);
}

.scene-solution {
  background: var(--brand-primary-light);
  border-left: 3px solid var(--brand-primary);
  border-radius: 0 10px 10px 0;
  padding: 14px 16px;
  font-size: 0.91rem;
  color: var(--text-primary);
  line-height: 1.65;
  flex: 1;
}

.scene-solution strong {
  color: var(--brand-primary-dark);
}

/* ==========================================================================
   详情页底部下载收尾横幅 (Bottom CTA Card)
   ========================================================================== */
.section-cta {
  padding: 0 0 76px;
}

.bottom-cta-card {
  background: var(--bg-surface);
  background-image: radial-gradient(circle at 88% 20%, var(--brand-primary-light) 0%, rgba(255, 255, 255, 0) 58%);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 36px 40px;
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
}

.bottom-cta-info {
  display: flex;
  align-items: center;
  gap: 20px;
  max-width: 540px;
}

.bottom-cta-logo {
  width: 64px;
  height: 64px;
  border-radius: 16px;
  object-fit: cover;
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(15, 23, 42, 0.08);
  flex-shrink: 0;
  background: #fff;
}

.bottom-cta-info h2 {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 4px;
  letter-spacing: -0.01em;
}

.bottom-cta-info p {
  font-size: 0.94rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin: 0;
}

/* ==========================================================================
   页脚 (Footer)
   ========================================================================== */
.site-footer {
  background: #090d16;
  color: #94a3b8;
  padding: 64px 0 36px;
  font-size: 0.88rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
  gap: 40px;
  padding-bottom: 44px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-brand h3 {
  color: #ffffff;
  font-size: 1.15rem;
  font-weight: 800;
  margin-bottom: 10px;
}

.footer-brand p {
  font-size: 0.86rem;
  line-height: 1.65;
  margin-bottom: 12px;
  color: #94a3b8;
}

.footer-col h4 {
  color: #f8fafc;
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.footer-col ul {
  list-style: none;
  display: grid;
  gap: 10px;
}

.footer-col a {
  color: #94a3b8;
  font-size: 0.86rem;
}

.footer-col a:hover {
  color: #ffffff;
}

.footer-bottom {
  padding-top: 28px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: 0.82rem;
  color: #64748b;
}

.footer-bottom a {
  color: #94a3b8;
}

.footer-bottom a:hover {
  color: #ffffff;
}

/* ==========================================================================
   下载与二维码弹窗 (Modal)
   ========================================================================== */
.dl-modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 999;
  padding: 20px;
}

.dl-modal-backdrop.active {
  display: flex;
}

.dl-modal {
  background: #ffffff;
  border-radius: var(--radius-lg);
  max-width: 460px;
  width: 100%;
  padding: 28px;
  box-shadow: var(--shadow-lg);
  position: relative;
}

.dl-modal-close {
  position: absolute;
  top: 18px;
  right: 18px;
  border: none;
  background: var(--bg-subtle);
  width: 32px;
  height: 32px;
  border-radius: 999px;
  font-size: 1.1rem;
  cursor: pointer;
  color: var(--text-secondary);
}

/* ==========================================================================
   响应式适配 (Responsive Breakpoints)
   ========================================================================== */
@media (max-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .workflow-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .stats-bar {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 900px) {
  .hero-grid,
  .about-banner,
  .compare-grid,
  .scene-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .about-banner,
  .bottom-cta-card {
    padding: 28px 24px;
  }
  .bottom-cta-card {
    flex-direction: column;
    align-items: flex-start;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 680px) {
  .container {
    padding: 0 18px;
  }

  .brand-divider,
  .brand-sub {
    display: none;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: #ffffff;
    flex-direction: column;
    align-items: stretch;
    padding: 16px 20px 20px;
    gap: 6px;
    border-bottom: 1px solid var(--border-light);
    box-shadow: var(--shadow-md);
  }

  .site-nav a {
    padding: 10px 8px;
    font-size: 0.96rem;
    border-radius: 8px;
  }

  .site-nav a.active::after {
    display: none;
  }

  .site-nav a.active {
    background: var(--brand-primary-light);
  }

  .site-nav.open {
    display: flex;
  }

  .mobile-menu-btn {
    display: inline-flex;
  }

  .hero,
  .hero-centered {
    padding: 36px 0 32px;
  }

  .hero-app-header,
  .app-hero-identity {
    gap: 16px;
    align-items: flex-start;
  }

  .hero-app-logo,
  .app-hero-logo {
    width: 68px;
    height: 68px;
    border-radius: 16px;
  }

  .hero-title {
    font-size: 1.65rem;
  }

  .hero-subtitle {
    font-size: 0.96rem;
  }

  .hero-desc {
    font-size: 0.94rem;
    margin-bottom: 22px;
  }

  .download-matrix {
    flex-direction: column;
    gap: 10px;
  }

  .dl-btn {
    width: 100%;
    justify-content: center;
    padding: 12px 18px;
  }

  .hero-meta-note {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

  .hero-meta-note span + span::before {
    display: none;
  }

  .section {
    padding: 48px 0;
  }

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

  .app-card,
  .feature-box,
  .compare-card,
  .step-card {
    padding: 22px 20px;
  }

  .faq-item {
    padding: 16px 18px;
  }

  .app-showcase-grid,
  .features-grid,
  .workflow-grid,
  .stats-bar,
  .hero-stats-grid,
  .about-highlights {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }
}