/* ==========================================================================
   OCCT 官方推广网站 — 共用样式表
   配色基于OCCT官方品牌色 #FF002B
   风格：扁平现代专业
   ========================================================================== */

/* ---------- 1. 设计令牌（Design Tokens） ---------- */
:root {
  /* 品牌主色 */
  --occt-red: #FF002B;
  --occt-red-dark: #C80022;
  --occt-red-darker: #9C0019;
  --occt-red-light: #FF4D6D;
  --occt-red-soft: rgba(255, 0, 43, 0.08);
  --occt-red-border: rgba(255, 0, 43, 0.25);

  /* 暗色背景 */
  --bg-dark: #0E0E0E;
  --bg-dark-2: #161616;
  --bg-dark-3: #1F1F1F;
  --bg-dark-4: #2A2A2A;

  /* 浅色背景 */
  --bg-light: #FFFFFF;
  --bg-light-2: #F7F8FA;
  --bg-light-3: #EFF1F4;

  /* 文字色 */
  --text-light: #FFFFFF;
  --text-light-2: #B3B3B3;
  --text-light-3: #777777;
  --text-dark: #1A1A1A;
  --text-dark-2: #4A4A4A;
  --text-dark-3: #888888;

  /* 边框 */
  --border-dark: #2A2A2A;
  --border-light: #E5E5E5;

  /* 功能色 */
  --success: #00C896;
  --warning: #FFB800;
  --info: #3B82F6;

  /* 渐变 */
  --grad-primary: linear-gradient(135deg, #FF002B 0%, #FF4D6D 100%);
  --grad-hero: radial-gradient(ellipse at top right, rgba(255, 0, 43, 0.18) 0%, transparent 55%),
               radial-gradient(ellipse at bottom left, rgba(255, 77, 109, 0.10) 0%, transparent 55%),
               #0E0E0E;
  --grad-card-dark: linear-gradient(180deg, #1A1A1A 0%, #141414 100%);

  /* 阴影 */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.12);
  --shadow-red: 0 8px 24px rgba(255, 0, 43, 0.25);

  /* 圆角 */
  --r-sm: 6px;
  --r-md: 10px;
  --r-lg: 16px;
  --r-xl: 24px;
  --r-pill: 999px;

  /* 间距 */
  --container: 1200px;
  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 24px;
  --space-lg: 40px;
  --space-xl: 64px;
  --space-2xl: 96px;

  /* 字体 */
  --font-heading: "Oxanium", "Inter", -apple-system, BlinkMacSystemFont,
                  "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
               "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
               "Helvetica Neue", Arial, sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", Consolas, "Source Code Pro",
               monospace;
}

/* ---------- 2. 基础重置 ---------- */
*, *::before, *::after { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-dark);
  background: var(--bg-light);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  margin: 0 0 var(--space-md);
  letter-spacing: -0.01em;
}

h1 { font-size: clamp(2.2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.8rem, 4vw, 2.6rem); }
h3 { font-size: clamp(1.3rem, 3vw, 1.7rem); }
h4 { font-size: 1.15rem; }

p { margin: 0 0 var(--space-md); }

a {
  color: var(--occt-red);
  text-decoration: none;
  transition: color 0.2s ease;
}
a:hover { color: var(--occt-red-dark); }

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

ul, ol { margin: 0 0 var(--space-md); padding-left: 1.25rem; }
li { margin-bottom: 6px; }

code {
  font-family: var(--font-mono);
  background: var(--bg-light-3);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.9em;
  color: var(--occt-red-dark);
}

/* ---------- 3. 通用布局 ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.section {
  padding: var(--space-2xl) 0;
}
.section--sm { padding: var(--space-xl) 0; }
.section--dark {
  background: var(--bg-dark);
  color: var(--text-light);
}
.section--dark-2 { background: var(--bg-dark-2); color: var(--text-light); }
.section--light-2 { background: var(--bg-light-2); }

.section-head {
  text-align: center;
  max-width: 760px;
  margin: 0 auto var(--space-xl);
}
.section-head h2 { margin-bottom: var(--space-sm); }
.section-head .eyebrow {
  display: inline-block;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--occt-red);
  margin-bottom: var(--space-sm);
  padding: 4px 12px;
  background: var(--occt-red-soft);
  border-radius: var(--r-pill);
}
.section--dark .section-head .eyebrow {
  background: rgba(255, 0, 43, 0.12);
}
.section-head p {
  color: var(--text-dark-2);
  font-size: 1.05rem;
}
.section--dark .section-head p { color: var(--text-light-2); }

/* ---------- 4. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.98rem;
  padding: 12px 28px;
  border-radius: var(--r-pill);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
  white-space: nowrap;
  line-height: 1;
}
.btn--primary {
  background: var(--occt-red);
  color: #fff;
  box-shadow: var(--shadow-red);
}
.btn--primary:hover {
  background: var(--occt-red-dark);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(255, 0, 43, 0.35);
}
.btn--ghost-light {
  background: transparent;
  color: #fff;
  border-color: rgba(255, 255, 255, 0.3);
}
.btn--ghost-light:hover {
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  border-color: rgba(255, 255, 255, 0.5);
}
.btn--ghost-dark {
  background: transparent;
  color: var(--text-dark);
  border-color: var(--border-light);
}
.btn--ghost-dark:hover {
  background: var(--bg-light-2);
  border-color: var(--occt-red);
  color: var(--occt-red);
}
.btn--lg { padding: 16px 36px; font-size: 1.05rem; }
.btn--block { width: 100%; }

.btn-icon {
  display: inline-flex;
  width: 20px;
  height: 20px;
  align-items: center;
  justify-content: center;
}

/* ---------- 5. 顶部导航栏 ---------- */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(14, 14, 14, 0.92);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  transition: all 0.3s ease;
}
.navbar.is-scrolled {
  background: rgba(14, 14, 14, 0.98);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
}
.navbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  text-decoration: none;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: 0.02em;
}
.brand img { width: 34px; height: 34px; }
.brand__text { color: #fff; }
.brand__text strong { color: var(--occt-red); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-links a {
  display: inline-block;
  padding: 8px 14px;
  color: var(--text-light-2);
  font-size: 0.95rem;
  font-weight: 500;
  border-radius: var(--r-sm);
  transition: all 0.2s ease;
}
.nav-links a:hover,
.nav-links a.is-active {
  color: #fff;
  background: rgba(255, 255, 255, 0.06);
}
.nav-cta {
  display: flex;
  align-items: center;
  gap: 12px;
}
.nav-cta .btn { padding: 9px 22px; font-size: 0.9rem; }

.nav-toggle {
  display: none;
  width: 44px; height: 44px;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--r-sm);
  cursor: pointer;
  color: #fff;
  align-items: center;
  justify-content: center;
}
.nav-toggle svg { width: 22px; height: 22px; }

/* 移动端导航 */
@media (max-width: 960px) {
  .nav-toggle { display: inline-flex; }
  .nav-links {
    position: fixed;
    top: 68px; left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    background: var(--bg-dark);
    padding: var(--space-md);
    gap: 4px;
    border-bottom: 1px solid var(--border-dark);
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: all 0.3s ease;
  }
  .nav-links.is-open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .nav-links a { padding: 12px 14px; font-size: 1rem; }
  .nav-cta .btn--ghost-light { display: none; }
}

/* ---------- 6. Hero 区 ---------- */
.hero {
  position: relative;
  background: var(--grad-hero);
  color: #fff;
  padding: 140px 0 96px;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  top: -120px; right: -120px;
  width: 520px; height: 520px;
  background: radial-gradient(circle, rgba(255, 0, 43, 0.25) 0%, transparent 70%);
  pointer-events: none;
}
.hero::after {
  content: "";
  position: absolute;
  bottom: -80px; left: -80px;
  width: 360px; height: 360px;
  background: radial-gradient(circle, rgba(255, 77, 109, 0.15) 0%, transparent 70%);
  pointer-events: none;
}
.hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: var(--space-xl);
  align-items: center;
}
.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border: 1px solid rgba(255, 0, 43, 0.4);
  background: rgba(255, 0, 43, 0.08);
  border-radius: var(--r-pill);
  font-size: 0.85rem;
  color: var(--occt-red-light);
  font-weight: 500;
  margin-bottom: var(--space-md);
}
.hero__badge .dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--occt-red);
  box-shadow: 0 0 12px var(--occt-red);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(1.4); }
}
.hero h1 {
  color: #fff;
  margin-bottom: var(--space-md);
}
.hero h1 .accent {
  background: var(--grad-primary);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero__sub {
  font-size: 1.15rem;
  color: var(--text-light-2);
  max-width: 560px;
  margin-bottom: var(--space-lg);
}
.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: var(--space-lg);
}
.hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-lg);
  padding-top: var(--space-md);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}
.hero__stat .num {
  font-family: var(--font-heading);
  font-size: 1.8rem;
  font-weight: 700;
  color: #fff;
  line-height: 1;
}
.hero__stat .num .accent { color: var(--occt-red); }
.hero__stat .label {
  font-size: 0.85rem;
  color: var(--text-light-3);
  margin-top: 4px;
}

/* Hero 右侧产品预览卡片 */
.hero__visual { position: relative; }
.hero__card {
  background: var(--grad-card-dark);
  border: 1px solid var(--border-dark);
  border-radius: var(--r-lg);
  padding: var(--space-md);
  box-shadow: var(--shadow-lg);
}
.hero__card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--border-dark);
}
.hero__card-title {
  display: flex;
  align-items: center;
  gap: 8px;
  color: #fff;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1rem;
}
.hero__card-title .dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 8px var(--success);
}
.hero__card-status {
  font-size: 0.8rem;
  color: var(--text-light-3);
  font-family: var(--font-mono);
}
.hero__metric {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin-bottom: var(--space-md);
}
.hero__metric-item {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-dark);
  border-radius: var(--r-md);
  padding: 10px 12px;
}
.hero__metric-item .k {
  font-size: 0.72rem;
  color: var(--text-light-3);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.hero__metric-item .v {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  color: #fff;
  font-weight: 600;
  margin-top: 2px;
}
.hero__metric-item .v.ok { color: var(--success); }
.hero__metric-item .v.warn { color: var(--warning); }

.hero__chart {
  height: 90px;
  background:
    linear-gradient(180deg, rgba(255, 0, 43, 0.18) 0%, rgba(255, 0, 43, 0) 100%),
    repeating-linear-gradient(90deg,
      transparent 0, transparent 22px,
      rgba(255, 255, 255, 0.04) 22px, rgba(255, 255, 255, 0.04) 23px);
  border-radius: var(--r-md);
  position: relative;
  overflow: hidden;
}
.hero__chart svg {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
}

@media (max-width: 960px) {
  .hero__inner { grid-template-columns: 1fr; }
  .hero__visual { display: none; }
  .hero { padding: 120px 0 64px; }
}

/* ---------- 7. 信任栏 ---------- */
.trustbar {
  background: var(--bg-dark-2);
  padding: var(--space-md) 0;
  border-top: 1px solid var(--border-dark);
  border-bottom: 1px solid var(--border-dark);
}
.trustbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-md);
  color: var(--text-light-2);
  font-size: 0.9rem;
}
.trustbar__label {
  font-family: var(--font-heading);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  font-size: 0.78rem;
  color: var(--text-light-3);
}
.trustbar__logos {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-lg);
  align-items: center;
}
.trustbar__logo {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text-light-2);
  opacity: 0.7;
  transition: opacity 0.2s ease;
}
.trustbar__logo:hover { opacity: 1; color: #fff; }

/* ---------- 8. 特性卡片网格 ---------- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}
.feature-grid--2 { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 960px) {
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .feature-grid, .feature-grid--2 { grid-template-columns: 1fr; }
}

.feature-card {
  background: var(--bg-light);
  border: 1px solid var(--border-light);
  border-radius: var(--r-lg);
  padding: var(--space-md);
  transition: all 0.25s ease;
  height: 100%;
}
.feature-card:hover {
  border-color: var(--occt-red);
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}
.feature-card__icon {
  width: 52px; height: 52px;
  border-radius: var(--r-md);
  background: var(--occt-red-soft);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--occt-red);
  margin-bottom: var(--space-sm);
}
.feature-card__icon svg { width: 28px; height: 28px; }
.feature-card h3 {
  font-size: 1.2rem;
  margin-bottom: 8px;
  color: var(--text-dark);
}
.feature-card p {
  color: var(--text-dark-2);
  font-size: 0.95rem;
  margin: 0;
}
.feature-card__more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: var(--space-sm);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--occt-red);
}

/* 暗色卡片 */
.section--dark .feature-card {
  background: var(--grad-card-dark);
  border-color: var(--border-dark);
}
.section--dark .feature-card h3 { color: #fff; }
.section--dark .feature-card p { color: var(--text-light-2); }

/* ---------- 9. 使用场景 ---------- */
.scenario-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}
@media (max-width: 960px) {
  .scenario-grid { grid-template-columns: 1fr; }
}
.scenario-card {
  position: relative;
  background: var(--grad-card-dark);
  border: 1px solid var(--border-dark);
  border-radius: var(--r-lg);
  overflow: hidden;
  padding: var(--space-md);
  transition: all 0.25s ease;
}
.scenario-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--grad-primary);
  opacity: 0.7;
}
.scenario-card:hover {
  transform: translateY(-4px);
  border-color: var(--occt-red-border);
  box-shadow: var(--shadow-lg);
}
.scenario-card__num {
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--occt-red);
  letter-spacing: 0.1em;
  margin-bottom: 8px;
}
.scenario-card h3 {
  color: #fff;
  font-size: 1.3rem;
  margin-bottom: 10px;
}
.scenario-card p {
  color: var(--text-light-2);
  font-size: 0.95rem;
  margin-bottom: var(--space-sm);
}
.scenario-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: var(--space-sm);
}
.scenario-card__tag {
  font-size: 0.78rem;
  padding: 4px 10px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--text-light-2);
  border-radius: var(--r-pill);
}

/* ---------- 10. 用户评价 ---------- */
.review-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}
@media (max-width: 960px) {
  .review-grid { grid-template-columns: 1fr; }
}
.review-card {
  background: var(--bg-light);
  border: 1px solid var(--border-light);
  border-radius: var(--r-lg);
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  height: 100%;
  transition: all 0.25s ease;
}
.review-card:hover {
  border-color: var(--occt-red-border);
  box-shadow: var(--shadow-md);
}
.review-card__stars {
  color: #FFB800;
  font-size: 1rem;
  letter-spacing: 2px;
  margin-bottom: var(--space-sm);
}
.review-card__text {
  color: var(--text-dark);
  font-size: 0.98rem;
  line-height: 1.7;
  flex: 1;
  margin-bottom: var(--space-md);
  position: relative;
  padding-left: 18px;
}
.review-card__text::before {
  content: "\201C";
  position: absolute;
  left: -2px; top: -8px;
  font-family: Georgia, serif;
  font-size: 2.4rem;
  color: var(--occt-red);
  line-height: 1;
  opacity: 0.6;
}
.review-card__author {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-top: var(--space-sm);
  border-top: 1px solid var(--border-light);
}
.review-card__avatar {
  width: 40px; height: 40px;
  border-radius: 50%;
  background: var(--grad-primary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1rem;
}
.review-card__name {
  font-weight: 600;
  color: var(--text-dark);
  font-size: 0.95rem;
}
.review-card__role {
  font-size: 0.82rem;
  color: var(--text-dark-3);
}

/* ---------- 11. 版本/价格卡片 ---------- */
.plan-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
}
@media (max-width: 1100px) {
  .plan-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .plan-grid { grid-template-columns: 1fr; }
}
.plan-card {
  background: var(--bg-light);
  border: 1px solid var(--border-light);
  border-radius: var(--r-lg);
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  transition: all 0.25s ease;
  position: relative;
}
.plan-card.is-featured {
  border-color: var(--occt-red);
  box-shadow: var(--shadow-red);
  transform: translateY(-6px);
}
.plan-card__badge {
  position: absolute;
  top: -12px; left: 50%;
  transform: translateX(-50%);
  background: var(--grad-primary);
  color: #fff;
  padding: 4px 14px;
  border-radius: var(--r-pill);
  font-size: 0.78rem;
  font-weight: 600;
  font-family: var(--font-heading);
  letter-spacing: 0.04em;
  white-space: nowrap;
}
.plan-card__name {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 4px;
}
.plan-card__target {
  font-size: 0.82rem;
  color: var(--text-dark-3);
  margin-bottom: var(--space-sm);
}
.plan-card__price {
  font-family: var(--font-heading);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: var(--space-sm);
}
.plan-card__price .unit {
  font-size: 0.85rem;
  color: var(--text-dark-3);
  font-weight: 500;
}
.plan-card__features {
  list-style: none;
  padding: 0;
  margin: 0 0 var(--space-md);
  flex: 1;
}
.plan-card__features li {
  font-size: 0.9rem;
  color: var(--text-dark-2);
  padding: 6px 0;
  display: flex;
  align-items: flex-start;
  gap: 8px;
}
.plan-card__features li::before {
  content: "";
  flex-shrink: 0;
  width: 16px; height: 16px;
  margin-top: 4px;
  background: var(--occt-red);
  -webkit-mask: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'><path d='M9 16.2l-3.5-3.5L4 14.2 9 19.2 20 8.2l-1.5-1.5z' fill='black'/></svg>") center / contain no-repeat;
  mask: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'><path d='M9 16.2l-3.5-3.5L4 14.2 9 19.2 20 8.2l-1.5-1.5z' fill='black'/></svg>") center / contain no-repeat;
}
.plan-card__features li.disabled {
  color: var(--text-dark-3);
  opacity: 0.5;
}
.plan-card__features li.disabled::before {
  background: var(--text-dark-3);
}

/* ---------- 12. CTA 区 ---------- */
.cta-band {
  background: var(--grad-primary);
  border-radius: var(--r-xl);
  padding: var(--space-xl) var(--space-lg);
  text-align: center;
  color: #fff;
  position: relative;
  overflow: hidden;
}
.cta-band::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 20%, rgba(255, 255, 255, 0.15) 0%, transparent 40%),
    radial-gradient(circle at 80% 80%, rgba(0, 0, 0, 0.15) 0%, transparent 40%);
}
.cta-band > * { position: relative; z-index: 1; }
.cta-band h2 { color: #fff; margin-bottom: var(--space-sm); }
.cta-band p {
  color: rgba(255, 255, 255, 0.9);
  font-size: 1.05rem;
  max-width: 600px;
  margin: 0 auto var(--space-lg);
}
.cta-band .btn--ghost-light {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.4);
  color: #fff;
}
.cta-band .btn--ghost-light:hover {
  background: rgba(255, 255, 255, 0.25);
}
.cta-band .btn--ghost-light:hover { color: #fff; }

/* ---------- 13. 下载弹窗 ---------- */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
  padding: var(--space-md);
}
.modal.is-open {
  opacity: 1;
  pointer-events: auto;
}
.modal__dialog {
  background: var(--bg-light);
  border-radius: var(--r-lg);
  max-width: 720px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  transform: translateY(20px) scale(0.98);
  transition: transform 0.25s ease;
  box-shadow: var(--shadow-lg);
}
.modal.is-open .modal__dialog {
  transform: translateY(0) scale(1);
}
.modal__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md);
  border-bottom: 1px solid var(--border-light);
}
.modal__title {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-dark);
  margin: 0;
}
.modal__close {
  width: 36px; height: 36px;
  border: none;
  background: var(--bg-light-2);
  border-radius: 50%;
  cursor: pointer;
  color: var(--text-dark-2);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  line-height: 1;
  transition: all 0.2s ease;
}
.modal__close:hover {
  background: var(--occt-red);
  color: #fff;
  transform: rotate(90deg);
}
.modal__body { padding: var(--space-md); }
.qr-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}
@media (max-width: 560px) {
  .qr-row { grid-template-columns: 1fr; }
}
.qr-block {
  text-align: center;
  padding: var(--space-md);
  border: 1px solid var(--border-light);
  border-radius: var(--r-md);
  background: var(--bg-light-2);
}
.qr-block__img {
  width: 180px; height: 180px;
  margin: 0 auto var(--space-sm);
  background: #fff;
  padding: 8px;
  border-radius: var(--r-sm);
  border: 1px solid var(--border-light);
}
.qr-block__img img { width: 100%; height: 100%; }
.qr-block__name {
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--text-dark);
  font-size: 1.05rem;
  margin-bottom: 4px;
}
.qr-block__meta {
  font-size: 0.85rem;
  color: var(--text-dark-3);
  margin-bottom: var(--space-sm);
}
.qr-block__hint {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  color: var(--occt-red);
  font-weight: 500;
}
.modal__tips {
  margin-top: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  background: var(--occt-red-soft);
  border-radius: var(--r-md);
  font-size: 0.88rem;
  color: var(--text-dark-2);
}
.modal__tips strong { color: var(--occt-red-dark); }

/* ---------- 14. 步骤区 ---------- */
.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
  counter-reset: step;
}
@media (max-width: 960px) {
  .steps { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px) {
  .steps { grid-template-columns: 1fr; }
}
.step-card {
  background: var(--bg-light);
  border: 1px solid var(--border-light);
  border-radius: var(--r-lg);
  padding: var(--space-md);
  position: relative;
  counter-increment: step;
}
.step-card::before {
  content: counter(step, decimal-leading-zero);
  display: inline-flex;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.4rem;
  color: var(--occt-red);
  background: var(--occt-red-soft);
  width: 48px; height: 48px;
  border-radius: var(--r-md);
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-sm);
}
.step-card h4 {
  font-size: 1.05rem;
  color: var(--text-dark);
  margin-bottom: 6px;
}
.step-card p {
  font-size: 0.92rem;
  color: var(--text-dark-2);
  margin: 0;
}

/* ---------- 15. 测试项详情 ---------- */
.test-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
}
.test-item {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: var(--space-md);
  padding: var(--space-md);
  background: var(--bg-light);
  border: 1px solid var(--border-light);
  border-radius: var(--r-lg);
  transition: all 0.25s ease;
}
.test-item:hover {
  border-color: var(--occt-red-border);
  box-shadow: var(--shadow-md);
}
.test-item__icon {
  width: 64px; height: 64px;
  border-radius: var(--r-md);
  background: var(--occt-red-soft);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--occt-red);
}
.test-item__icon svg { width: 32px; height: 32px; }
.test-item h3 { font-size: 1.2rem; margin-bottom: 6px; color: var(--text-dark); }
.test-item__desc {
  color: var(--text-dark-2);
  font-size: 0.95rem;
  margin-bottom: var(--space-sm);
}
.test-item__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.test-item__tag {
  font-size: 0.78rem;
  padding: 3px 10px;
  border-radius: var(--r-pill);
  background: var(--bg-light-3);
  color: var(--text-dark-2);
  font-weight: 500;
}
.test-item__tag.tag-red {
  background: var(--occt-red-soft);
  color: var(--occt-red-dark);
}
@media (max-width: 560px) {
  .test-item { grid-template-columns: 1fr; }
  .test-item__icon { width: 48px; height: 48px; }
}

/* ---------- 16. FAQ 手风琴 ---------- */
.faq-list {
  max-width: 820px;
  margin: 0 auto;
}
.faq-item {
  background: var(--bg-light);
  border: 1px solid var(--border-light);
  border-radius: var(--r-md);
  margin-bottom: var(--space-sm);
  overflow: hidden;
  transition: all 0.2s ease;
}
.faq-item.is-open {
  border-color: var(--occt-red-border);
  box-shadow: var(--shadow-sm);
}
.faq-item__q {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-sm) var(--space-md);
  cursor: pointer;
  font-weight: 600;
  color: var(--text-dark);
  font-size: 1rem;
  font-family: var(--font-heading);
  background: transparent;
  border: none;
  width: 100%;
  text-align: left;
}
.faq-item__q:hover { color: var(--occt-red); }
.faq-item__q .chev {
  width: 20px; height: 20px;
  transition: transform 0.25s ease;
  color: var(--occt-red);
  flex-shrink: 0;
}
.faq-item.is-open .faq-item__q .chev { transform: rotate(180deg); }
.faq-item__a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}
.faq-item__a-inner {
  padding: 0 var(--space-md) var(--space-md);
  color: var(--text-dark-2);
  font-size: 0.95rem;
  line-height: 1.7;
}
.faq-item.is-open .faq-item__a { max-height: 500px; }

/* ---------- 17. 系统需求表 ---------- */
.spec-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--bg-light);
  border-radius: var(--r-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-light);
}
.spec-table th, .spec-table td {
  padding: 14px var(--space-md);
  text-align: left;
  border-bottom: 1px solid var(--border-light);
}
.spec-table th {
  background: var(--bg-light-2);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-dark);
}
.spec-table tr:last-child td { border-bottom: none; }
.spec-table td {
  color: var(--text-dark-2);
  font-size: 0.95rem;
}
.spec-table td strong { color: var(--text-dark); }
.spec-table .col-key {
  width: 30%;
  font-weight: 600;
  color: var(--text-dark);
  background: var(--bg-light-2);
}

/* ---------- 18. 时间线 ---------- */
.timeline {
  position: relative;
  max-width: 860px;
  margin: 0 auto;
  padding-left: 32px;
}
.timeline::before {
  content: "";
  position: absolute;
  left: 8px; top: 8px; bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--occt-red) 0%, rgba(255, 0, 43, 0.1) 100%);
}
.timeline__item {
  position: relative;
  padding-bottom: var(--space-lg);
}
.timeline__item:last-child { padding-bottom: 0; }
.timeline__item::before {
  content: "";
  position: absolute;
  left: -28px; top: 4px;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--occt-red);
  box-shadow: 0 0 0 4px rgba(255, 0, 43, 0.18);
}
.timeline__year {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--occt-red);
  margin-bottom: 4px;
}
.timeline__title {
  font-weight: 600;
  color: var(--text-dark);
  font-size: 1.05rem;
  margin-bottom: 4px;
}
.timeline__desc {
  color: var(--text-dark-2);
  font-size: 0.95rem;
  margin: 0;
}
.section--dark .timeline__title { color: #fff; }
.section--dark .timeline__desc { color: var(--text-light-2); }

/* ---------- 19. 通用页头 ---------- */
.page-header {
  background: var(--grad-hero);
  color: #fff;
  padding: 140px 0 64px;
  position: relative;
  overflow: hidden;
}
.page-header::before {
  content: "";
  position: absolute;
  top: -80px; right: -80px;
  width: 360px; height: 360px;
  background: radial-gradient(circle, rgba(255, 0, 43, 0.18) 0%, transparent 70%);
}
.page-header__inner {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}
.page-header h1 { color: #fff; margin-bottom: var(--space-sm); }
.page-header p {
  font-size: 1.1rem;
  color: var(--text-light-2);
  margin: 0;
}
.breadcrumb {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-light-3);
  margin-bottom: var(--space-sm);
}
.breadcrumb a { color: var(--text-light-2); }
.breadcrumb a:hover { color: var(--occt-red-light); }
.breadcrumb span { color: var(--text-light-3); }

/* ---------- 20. 页脚 ---------- */
.footer {
  background: var(--bg-dark);
  color: var(--text-light-2);
  padding: var(--space-xl) 0 var(--space-md);
  border-top: 1px solid var(--border-dark);
}
.footer__top {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: var(--space-lg);
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--border-dark);
}
@media (max-width: 760px) {
  .footer__top { grid-template-columns: 1fr 1fr; gap: var(--space-md); }
}
@media (max-width: 480px) {
  .footer__top { grid-template-columns: 1fr; }
}
.footer__brand .brand { margin-bottom: var(--space-sm); }
.footer__desc {
  font-size: 0.9rem;
  color: var(--text-light-3);
  line-height: 1.7;
  max-width: 320px;
}
.footer__col h5 {
  color: #fff;
  font-family: var(--font-heading);
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: var(--space-sm);
}
.footer__col ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.footer__col li { margin-bottom: 8px; }
.footer__col a {
  color: var(--text-light-2);
  font-size: 0.9rem;
  transition: color 0.2s ease;
}
.footer__col a:hover { color: var(--occt-red); }
.footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-sm);
  font-size: 0.82rem;
  color: var(--text-light-3);
}
.footer__bottom a { color: var(--text-light-3); }
.footer__bottom a:hover { color: var(--occt-red-light); }
.footer__social {
  display: flex;
  gap: 8px;
}
.footer__social a {
  width: 36px; height: 36px;
  border-radius: var(--r-sm);
  background: var(--bg-dark-3);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--text-light-2);
  transition: all 0.2s ease;
}
.footer__social a:hover {
  background: var(--occt-red);
  color: #fff;
  transform: translateY(-2px);
}
.footer__social svg { width: 18px; height: 18px; }

/* ---------- 21. 内容文档样式 ---------- */
.prose {
  max-width: 820px;
  margin: 0 auto;
}
.prose h2 { margin-top: var(--space-xl); }
.prose h3 { margin-top: var(--space-lg); }
.prose p { font-size: 1rem; color: var(--text-dark-2); line-height: 1.85; }
.prose ul, .prose ol { color: var(--text-dark-2); }
.prose blockquote {
  border-left: 4px solid var(--occt-red);
  background: var(--occt-red-soft);
  padding: var(--space-sm) var(--space-md);
  margin: var(--space-md) 0;
  border-radius: 0 var(--r-md) var(--r-md) 0;
  color: var(--text-dark);
}
.prose blockquote p { margin: 0; }

/* ---------- 22. 通知条（顶部横幅） ---------- */
.topbanner {
  background: var(--grad-primary);
  color: #fff;
  text-align: center;
  padding: 8px var(--space-md);
  font-size: 0.88rem;
  position: relative;
  z-index: 1100;
}
.topbanner a { color: #fff; text-decoration: underline; font-weight: 600; }

/* ---------- 23. 工具类 ---------- */
.text-center { text-align: center; }
.text-red { color: var(--occt-red); }
.text-muted { color: var(--text-dark-3); }
.mt-0 { margin-top: 0; }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mb-0 { margin-bottom: 0; }
.d-none { display: none; }
.d-block { display: block; }
.d-flex { display: flex; }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.ai-center { align-items: center; }
.jc-center { justify-content: center; }
.flex-wrap { flex-wrap: wrap; }

/* ---------- 24. 滚动动画 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
  .reveal { opacity: 1; transform: none; }
  html { scroll-behavior: auto; }
}