/* ==========================================================================
   Windhawk 官方网站 - 主样式表
   设计风格：扁平现代专业
   配色：基于 Logo（黑底白鹰）+ 科技青色点缀
   ========================================================================== */

/* ---------- 1. 全局变量与重置 ---------- */
:root {
  /* 主色调 - 基于 logo */
  --color-dark: #0A0E1A;
  --color-dark-2: #0F1420;
  --color-dark-3: #1A1F2E;
  --color-dark-4: #232938;
  --color-white: #FFFFFF;

  /* 强调色 */
  --color-accent: #00D9C0;
  --color-accent-dark: #00B8A0;
  --color-accent-light: #5EEAD4;
  --color-accent-bg: rgba(0, 217, 192, 0.08);
  --color-orange: #FF6B35;
  --color-orange-dark: #E55A2B;

  /* 文字色 */
  --color-text-dark: #1A2332;
  --color-text-muted: #64748B;
  --color-text-light: #94A3B8;
  --color-text-lighter: #CBD5E1;
  --color-text-on-dark: #F1F5F9;
  --color-text-on-dark-muted: #94A3B8;

  /* 背景色 */
  --color-bg: #FFFFFF;
  --color-bg-soft: #F8FAFC;
  --color-bg-gray: #F1F5F9;
  --color-border: #E5E8EC;
  --color-border-dark: rgba(255, 255, 255, 0.08);

  /* 字体 */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI',
    'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
  --font-mono: 'JetBrains Mono', 'SFMono-Regular', Consolas, 'Liberation Mono',
    Menlo, monospace;

  /* 阴影 */
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.06);
  --shadow-lg: 0 12px 32px rgba(15, 23, 42, 0.08);
  --shadow-xl: 0 24px 64px rgba(15, 23, 42, 0.12);
  --shadow-accent: 0 8px 24px rgba(0, 217, 192, 0.25);

  /* 圆角 */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* 间距与布局 */
  --container-max: 1200px;
  --header-height: 68px;

  /* 过渡 */
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  color: var(--color-text-dark);
  background: var(--color-bg);
  overflow-x: hidden;
}

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

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

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

ul,
ol {
  list-style: none;
}

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

/* ---------- 2. 容器与布局 ---------- */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 96px 0;
}

.section-sm {
  padding: 64px 0;
}

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

.section-soft {
  background: var(--color-bg-soft);
}

.section-gray {
  background: var(--color-bg-gray);
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 56px;
}

.section-eyebrow {
  display: inline-block;
  padding: 6px 14px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: var(--color-accent-dark);
  background: var(--color-accent-bg);
  border-radius: var(--radius-full);
  margin-bottom: 16px;
}

.section-dark .section-eyebrow {
  color: var(--color-accent);
  background: rgba(0, 217, 192, 0.12);
}

.section-title {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
  color: var(--color-text-dark);
}

.section-dark .section-title {
  color: var(--color-white);
}

.section-subtitle {
  font-size: 17px;
  line-height: 1.7;
  color: var(--color-text-muted);
}

.section-dark .section-subtitle {
  color: var(--color-text-on-dark-muted);
}

/* ---------- 3. 按钮系统 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all var(--transition);
  cursor: pointer;
  white-space: nowrap;
  border: 1.5px solid transparent;
  text-decoration: none;
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-dark);
  box-shadow: var(--shadow-accent);
}

.btn-primary:hover {
  background: var(--color-accent-dark);
  color: var(--color-dark);
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(0, 217, 192, 0.35);
}

.btn-orange {
  background: var(--color-orange);
  color: var(--color-white);
  box-shadow: 0 8px 24px rgba(255, 107, 53, 0.25);
}

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

.btn-dark {
  background: var(--color-dark);
  color: var(--color-white);
}

.btn-dark:hover {
  background: var(--color-dark-3);
  color: var(--color-white);
}

.btn-outline {
  background: transparent;
  color: var(--color-text-dark);
  border-color: var(--color-border);
}

.btn-outline:hover {
  border-color: var(--color-accent);
  color: var(--color-accent-dark);
}

.btn-outline-light {
  background: transparent;
  color: var(--color-white);
  border-color: rgba(255, 255, 255, 0.25);
}

.btn-outline-light:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.btn-lg {
  padding: 16px 32px;
  font-size: 16px;
}

.btn-sm {
  padding: 8px 16px;
  font-size: 14px;
}

.btn-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

/* ---------- 4. 顶部导航 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  transition: all var(--transition);
}

.site-header.scrolled {
  box-shadow: var(--shadow-sm);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 19px;
  color: var(--color-dark);
}

.nav-brand img {
  height: 36px;
  width: auto;
}

.nav-brand-text {
  letter-spacing: -0.01em;
}

.nav-brand-text .accent {
  color: var(--color-accent-dark);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  padding: 8px 14px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text-dark);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

.nav-link:hover {
  color: var(--color-accent-dark);
  background: var(--color-accent-bg);
}

.nav-link.active {
  color: var(--color-accent-dark);
}

.nav-cta {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
}

.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--color-dark);
  border-radius: 2px;
  transition: all var(--transition);
}

.nav-toggle.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---------- 5. Hero 主视觉 ---------- */
.hero {
  position: relative;
  padding: calc(var(--header-height) + 80px) 0 96px;
  background: linear-gradient(180deg, var(--color-dark) 0%, var(--color-dark-2) 100%);
  color: var(--color-text-on-dark);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -200px;
  right: -200px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(0, 217, 192, 0.18) 0%, transparent 70%);
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -300px;
  left: -200px;
  width: 700px;
  height: 700px;
  background: radial-gradient(circle, rgba(255, 107, 53, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

.hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 56px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-accent);
  background: rgba(0, 217, 192, 0.1);
  border: 1px solid rgba(0, 217, 192, 0.25);
  border-radius: var(--radius-full);
  margin-bottom: 24px;
}

.hero-badge-dot {
  width: 8px;
  height: 8px;
  background: var(--color-accent);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--color-accent);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.hero-title {
  font-size: clamp(34px, 5.5vw, 60px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.025em;
  margin-bottom: 24px;
  color: var(--color-white);
}

.hero-title .gradient-text {
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 18px;
  line-height: 1.7;
  color: var(--color-text-on-dark-muted);
  margin-bottom: 32px;
  max-width: 540px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 48px;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  padding-top: 32px;
  border-top: 1px solid var(--color-border-dark);
}

.hero-stat-value {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-white);
  letter-spacing: -0.02em;
}

.hero-stat-value .unit {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-accent);
  margin-left: 2px;
}

.hero-stat-label {
  font-size: 13px;
  color: var(--color-text-on-dark-muted);
  margin-top: 4px;
}

.hero-visual {
  position: relative;
}

.hero-mockup {
  position: relative;
  background: var(--color-dark-3);
  border: 1px solid var(--color-border-dark);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
}

.hero-mockup-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 12px 16px;
  background: var(--color-dark-2);
  border-bottom: 1px solid var(--color-border-dark);
}

.hero-mockup-bar span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-dark-4);
}

.hero-mockup-bar span:nth-child(1) { background: #FF5F57; }
.hero-mockup-bar span:nth-child(2) { background: #FEBC2E; }
.hero-mockup-bar span:nth-child(3) { background: #28C840; }

.hero-mockup-title {
  margin-left: 12px;
  font-size: 12px;
  color: var(--color-text-on-dark-muted);
}

.hero-mockup-body {
  padding: 24px;
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 16px;
  min-height: 380px;
}

.hero-sidebar {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.hero-sidebar-item {
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  color: var(--color-text-on-dark-muted);
  display: flex;
  align-items: center;
  gap: 8px;
}

.hero-sidebar-item.active {
  background: var(--color-accent-bg);
  color: var(--color-accent);
}

.hero-sidebar-dot {
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: currentColor;
  opacity: 0.6;
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.hero-mod-card {
  padding: 14px;
  background: var(--color-dark-2);
  border: 1px solid var(--color-border-dark);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.hero-mod-info {
  flex: 1;
  min-width: 0;
}

.hero-mod-name {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-on-dark);
  margin-bottom: 2px;
}

.hero-mod-desc {
  font-size: 11px;
  color: var(--color-text-on-dark-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.hero-mod-toggle {
  width: 32px;
  height: 18px;
  background: var(--color-accent);
  border-radius: var(--radius-full);
  position: relative;
  flex-shrink: 0;
}

.hero-mod-toggle::after {
  content: '';
  position: absolute;
  top: 2px;
  right: 2px;
  width: 14px;
  height: 14px;
  background: var(--color-dark);
  border-radius: 50%;
}

.hero-mod-toggle.off {
  background: var(--color-dark-4);
}

.hero-mod-toggle.off::after {
  right: auto;
  left: 2px;
}

/* ---------- 6. 通用卡片 ---------- */
.card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: all var(--transition);
}

.card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.card-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent-bg);
  border-radius: var(--radius-md);
  margin-bottom: 20px;
  color: var(--color-accent-dark);
}

.section-dark .card-icon {
  background: rgba(0, 217, 192, 0.12);
  color: var(--color-accent);
}

.card-title {
  font-size: 19px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--color-text-dark);
  letter-spacing: -0.01em;
}

.section-dark .card-title {
  color: var(--color-white);
}

.card-text {
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text-muted);
}

.section-dark .card-text {
  color: var(--color-text-on-dark-muted);
}

/* ---------- 7. 特性网格 ---------- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

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

/* ---------- 8. 使用场景 ---------- */
.usecase-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.usecase-card {
  display: flex;
  gap: 20px;
  padding: 28px;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: all var(--transition);
}

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

.usecase-icon {
  flex-shrink: 0;
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-dark) 100%);
  border-radius: var(--radius-md);
  color: var(--color-dark);
}

.usecase-body h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--color-text-dark);
}

.usecase-body p {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--color-text-muted);
}

/* ---------- 9. 用户评价 ---------- */
.testimonial-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.testimonial-card {
  padding: 28px;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  gap: 20px;
  transition: all var(--transition);
}

.section-dark .testimonial-card {
  background: var(--color-dark-3);
  border-color: var(--color-border-dark);
}

.testimonial-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.testimonial-rating {
  display: flex;
  gap: 2px;
  color: var(--color-orange);
}

.testimonial-text {
  font-size: 15px;
  line-height: 1.75;
  color: var(--color-text-dark);
  flex: 1;
}

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

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
}

.section-dark .testimonial-author {
  border-color: var(--color-border-dark);
}

.testimonial-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-dark) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-dark);
  font-weight: 700;
  font-size: 15px;
  flex-shrink: 0;
}

.testimonial-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-dark);
}

.section-dark .testimonial-name {
  color: var(--color-white);
}

.testimonial-role {
  font-size: 13px;
  color: var(--color-text-muted);
}

.section-dark .testimonial-role {
  color: var(--color-text-on-dark-muted);
}

/* ---------- 10. 模组展示 ---------- */
.mod-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.mod-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
}

.mod-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.mod-card-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}

.mod-card-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: var(--color-accent-bg);
  color: var(--color-accent-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.mod-card-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-text-dark);
}

.mod-card-author {
  font-size: 12px;
  color: var(--color-text-muted);
}

.mod-card-desc {
  font-size: 14px;
  line-height: 1.65;
  color: var(--color-text-muted);
  margin-bottom: 16px;
  flex: 1;
}

.mod-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  border-top: 1px solid var(--color-border);
  font-size: 13px;
  color: var(--color-text-muted);
}

.mod-card-tag {
  display: inline-block;
  padding: 3px 8px;
  background: var(--color-bg-gray);
  color: var(--color-text-muted);
  border-radius: var(--radius-sm);
  font-size: 12px;
  font-weight: 500;
}

.mod-card-downloads {
  display: flex;
  align-items: center;
  gap: 4px;
  color: var(--color-text-muted);
}

/* ---------- 11. 步骤组件 ---------- */
.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  position: relative;
}

.step-card {
  position: relative;
  padding: 32px 24px;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  text-align: left;
  transition: all var(--transition);
}

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

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: var(--color-dark);
  color: var(--color-accent);
  border-radius: 50%;
  font-weight: 700;
  font-size: 16px;
  margin-bottom: 18px;
}

.step-title {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--color-text-dark);
}

.step-desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-muted);
}

/* ---------- 12. 页面通用 Hero (子页面) ---------- */
.page-hero {
  position: relative;
  padding: calc(var(--header-height) + 64px) 0 56px;
  background: linear-gradient(180deg, var(--color-dark) 0%, var(--color-dark-2) 100%);
  color: var(--color-text-on-dark);
  overflow: hidden;
}

.page-hero::before {
  content: '';
  position: absolute;
  top: -100px;
  right: -100px;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(0, 217, 192, 0.15) 0%, transparent 70%);
  pointer-events: none;
}

.page-hero-content {
  position: relative;
  z-index: 1;
  max-width: 760px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--color-text-on-dark-muted);
  margin-bottom: 20px;
}

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

.breadcrumb-sep {
  opacity: 0.5;
}

.page-hero-title {
  font-size: clamp(30px, 4.5vw, 46px);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
  color: var(--color-white);
}

.page-hero-subtitle {
  font-size: 17px;
  line-height: 1.7;
  color: var(--color-text-on-dark-muted);
  max-width: 640px;
}

/* ---------- 13. 下载弹窗 ---------- */
.download-modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(10, 14, 26, 0.78);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  z-index: 2000;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

.download-modal-overlay.active {
  opacity: 1;
  visibility: visible;
    left: 0;
  right: 0;
  top: 0;
  bottom: 0;
}
button { outline: none } 
.download-modal {
  background: var(--color-white);
  border-radius: var(--radius-xl);
  max-width: 640px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  transform: translateY(20px) scale(0.96);
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  box-shadow: var(--shadow-xl);
}

.download-modal-overlay.active .download-modal {
  transform: translateY(0) scale(1);
}

.download-modal-header {
  position: relative;
  padding: 32px 32px 24px;
  text-align: center;
  background: linear-gradient(180deg, var(--color-dark) 0%, var(--color-dark-2) 100%);
  color: var(--color-white);
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}

.download-modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  color: var(--color-white);
  transition: all var(--transition);
}

.download-modal-close:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: rotate(90deg);
}

.download-modal-title {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 8px;
}

.download-modal-subtitle {
  font-size: 14px;
  color: var(--color-text-on-dark-muted);
}

.download-modal-body {
  padding: 32px;
}

.download-qr-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 24px;
}

.download-qr-item {
  text-align: center;
  padding: 20px;
  background: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: all var(--transition);
}

.download-qr-item:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
}

.download-qr-img {
  width: 160px;
  height: 160px;
  margin: 0 auto 14px;
  display: block;
  background: white;
  padding: 8px;
  border-radius: var(--radius-md);
}

.download-qr-label {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-text-dark);
  margin-bottom: 4px;
}

.download-qr-hint {
  font-size: 12px;
  color: var(--color-text-muted);
}

.download-modal-info {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 20px;
  background: var(--color-bg-soft);
  border-radius: var(--radius-md);
  font-size: 13px;
  color: var(--color-text-muted);
}

.download-modal-info-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.download-modal-info-item strong {
  color: var(--color-text-dark);
}

/* ---------- 14. 下载中心页面 ---------- */
.download-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.download-card {
  padding: 32px;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
}

.download-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-lg);
}

.download-card.featured {
  background: var(--color-dark);
  color: var(--color-text-on-dark);
  border-color: var(--color-dark);
  position: relative;
  overflow: hidden;
}

.download-card.featured::before {
  content: '推荐';
  position: absolute;
  top: 20px;
  right: 20px;
  padding: 4px 10px;
  background: var(--color-accent);
  color: var(--color-dark);
  font-size: 12px;
  font-weight: 700;
  border-radius: var(--radius-full);
}

.download-card-platform {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}

.download-card-icon {
  width: 56px;
  height: 56px;
  background: var(--color-accent-bg);
  color: var(--color-accent-dark);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
}

.download-card.featured .download-card-icon {
  background: rgba(0, 217, 192, 0.15);
  color: var(--color-accent);
}

.download-card-name {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-text-dark);
}

.download-card.featured .download-card-name {
  color: var(--color-white);
}

.download-card-version {
  font-size: 13px;
  color: var(--color-text-muted);
}

.download-card.featured .download-card-version {
  color: var(--color-text-on-dark-muted);
}

.download-card-desc {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--color-text-muted);
  margin-bottom: 24px;
  flex: 1;
}

.download-card.featured .download-card-desc {
  color: var(--color-text-on-dark-muted);
}

.download-card-meta {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-bottom: 24px;
  padding: 16px;
  background: var(--color-bg-soft);
  border-radius: var(--radius-md);
}

.download-card.featured .download-card-meta {
  background: var(--color-dark-3);
}

.download-card-meta-item {
  font-size: 13px;
}

.download-card-meta-label {
  color: var(--color-text-muted);
  margin-bottom: 2px;
}

.download-card.featured .download-card-meta-label {
  color: var(--color-text-on-dark-muted);
}

.download-card-meta-value {
  font-weight: 600;
  color: var(--color-text-dark);
}

.download-card.featured .download-card-meta-value {
  color: var(--color-white);
}

/* ---------- 15. FAQ ---------- */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  background: var(--color-white);
  overflow: hidden;
  transition: all var(--transition);
}

.faq-item:hover {
  border-color: var(--color-accent);
}

.faq-item.active {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-sm);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 24px;
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text-dark);
  cursor: pointer;
  text-align: left;
  width: 100%;
}

.faq-icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent-dark);
  transition: transform var(--transition);
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.faq-item.active .faq-answer {
  max-height: 500px;
}

.faq-answer-inner {
  padding: 0 24px 20px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--color-text-muted);
}

/* ---------- 16. CTA Section ---------- */
.cta-section {
  background: linear-gradient(135deg, var(--color-dark) 0%, var(--color-dark-2) 100%);
  color: var(--color-white);
  padding: 80px 0;
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  top: -150px;
  right: -150px;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(0, 217, 192, 0.18) 0%, transparent 70%);
  pointer-events: none;
}

.cta-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 640px;
  margin: 0 auto;
}

.cta-title {
  font-size: clamp(28px, 4vw, 38px);
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.cta-subtitle {
  font-size: 17px;
  line-height: 1.7;
  color: var(--color-text-on-dark-muted);
  margin-bottom: 32px;
}

.cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: center;
}

/* ---------- 17. 教程页代码块 ---------- */
.code-block {
  background: var(--color-dark);
  color: var(--color-text-on-dark);
  padding: 20px 24px;
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.7;
  overflow-x: auto;
  margin: 16px 0;
}

.code-block .comment { color: var(--color-text-on-dark-muted); }
.code-block .keyword { color: var(--color-accent); }
.code-block .string { color: #FFB86B; }

.tutorial-content {
  max-width: 760px;
  margin: 0 auto;
}

.tutorial-content h2 {
  font-size: 26px;
  font-weight: 700;
  margin: 40px 0 16px;
  color: var(--color-text-dark);
  letter-spacing: -0.01em;
}

.tutorial-content h3 {
  font-size: 19px;
  font-weight: 700;
  margin: 28px 0 12px;
  color: var(--color-text-dark);
}

.tutorial-content p {
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text-dark);
  margin-bottom: 16px;
}

.tutorial-content ul,
.tutorial-content ol {
  margin: 12px 0 20px 20px;
}

.tutorial-content li {
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--color-text-dark);
  list-style: disc;
  margin-bottom: 6px;
}

.tutorial-content ol li {
  list-style: decimal;
}

.tutorial-content img {
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  margin: 16px 0;
  box-shadow: var(--shadow-sm);
}

.tutorial-tip {
  display: flex;
  gap: 14px;
  padding: 16px 20px;
  background: var(--color-accent-bg);
  border-left: 3px solid var(--color-accent);
  border-radius: var(--radius-md);
  margin: 20px 0;
}

.tutorial-tip-icon {
  flex-shrink: 0;
  color: var(--color-accent-dark);
}

.tutorial-tip-body {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--color-text-dark);
}

.tutorial-tip-body strong {
  color: var(--color-accent-dark);
}

/* ---------- 18. 关于页面 ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}

.about-text h2 {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--color-text-dark);
  letter-spacing: -0.01em;
}

.about-text p {
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text-muted);
  margin-bottom: 16px;
}

.about-visual {
  background: linear-gradient(135deg, var(--color-dark) 0%, var(--color-dark-2) 100%);
  border-radius: var(--radius-xl);
  padding: 48px;
  color: var(--color-white);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.about-visual::before {
  content: '';
  position: absolute;
  top: -100px;
  left: -100px;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(0, 217, 192, 0.2) 0%, transparent 70%);
}

.about-visual-img {
  position: relative;
  z-index: 1;
  width: 120px;
  height: 120px;
  margin: 0 auto 24px;
  background: var(--color-white);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.about-visual-title {
  position: relative;
  z-index: 1;
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 8px;
}

.about-visual-subtitle {
  position: relative;
  z-index: 1;
  font-size: 14px;
  color: var(--color-text-on-dark-muted);
}

.timeline {
  max-width: 760px;
  margin: 0 auto;
  position: relative;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 16px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-border);
}

.timeline-item {
  position: relative;
  padding-left: 56px;
  padding-bottom: 36px;
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-dot {
  position: absolute;
  left: 8px;
  top: 4px;
  width: 18px;
  height: 18px;
  background: var(--color-accent);
  border: 3px solid var(--color-white);
  border-radius: 50%;
  box-shadow: 0 0 0 2px var(--color-accent);
}

.timeline-date {
  font-size: 13px;
  font-weight: 700;
  color: var(--color-accent-dark);
  margin-bottom: 4px;
}

.timeline-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-text-dark);
  margin-bottom: 6px;
}

.timeline-desc {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--color-text-muted);
}

/* ---------- 19. 统计数字带 ---------- */
.stats-band {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  padding: 48px 0;
}

.stat-item {
  text-align: center;
}

.stat-value {
  font-size: clamp(32px, 4vw, 44px);
  font-weight: 800;
  color: var(--color-white);
  letter-spacing: -0.02em;
  line-height: 1;
}

.stat-value .accent {
  color: var(--color-accent);
}

.stat-label {
  font-size: 14px;
  color: var(--color-text-on-dark-muted);
  margin-top: 8px;
}

/* ---------- 20. 页脚 ---------- */
.site-footer {
  background: var(--color-dark);
  color: var(--color-text-on-dark-muted);
  padding: 72px 0 32px;
  position: relative;
  overflow: hidden;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
  opacity: 0.4;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 48px;
}

.footer-brand-text {
  font-size: 14px;
  line-height: 1.75;
  margin: 16px 0 20px;
  color: var(--color-text-on-dark-muted);
  max-width: 280px;
}

.footer-social {
  display: flex;
  gap: 10px;
}

.footer-social a {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-dark-3);
  border-radius: var(--radius-sm);
  color: var(--color-text-on-dark-muted);
  transition: all var(--transition);
}

.footer-social a:hover {
  background: var(--color-accent);
  color: var(--color-dark);
}

.footer-col-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 18px;
  letter-spacing: 0.02em;
}

.footer-col ul li {
  margin-bottom: 10px;
}

.footer-col ul li a {
  font-size: 14px;
  color: var(--color-text-on-dark-muted);
  transition: color var(--transition);
}

.footer-col ul li a:hover {
  color: var(--color-accent);
}

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid var(--color-border-dark);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 13px;
}

.footer-bottom-links {
  display: flex;
  gap: 20px;
}

.footer-bottom-links a:hover {
  color: var(--color-accent);
}

/* ---------- 21. 工具类 ---------- */
.text-center { text-align: center; }
.text-accent { color: var(--color-accent-dark); }
.mt-0 { margin-top: 0; }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; }
.mb-0 { margin-bottom: 0; }
.mb-8 { margin-bottom: 8px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }
.mb-32 { margin-bottom: 32px; }

.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.gap-8 { gap: 8px; }
.gap-12 { gap: 12px; }
.gap-16 { gap: 16px; }
.gap-24 { gap: 24px; }

/* ---------- 22. 滚动动画 ---------- */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- 23. 响应式 ---------- */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .hero-visual {
    max-width: 520px;
    margin: 0 auto;
  }

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

  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 768px) {
  .section {
    padding: 64px 0;
  }

  .nav-menu {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    background: var(--color-white);
    padding: 16px;
    gap: 4px;
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-lg);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition);
    max-height: calc(100vh - var(--header-height));
    overflow-y: auto;
  }

  .nav-menu.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-link {
    padding: 12px 14px;
    font-size: 16px;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-cta .btn-text {
    display: none;
  }

  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }

  .features-grid,
  .features-grid-2,
  .usecase-grid,
  .testimonial-grid,
  .mod-grid,
  .download-grid,
  .about-grid {
    grid-template-columns: 1fr;
  }

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

  .stats-band {
    grid-template-columns: 1fr 1fr;
    gap: 32px 16px;
  }

  .download-qr-grid {
    grid-template-columns: 1fr;
  }

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

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  .card,
  .usecase-card,
  .testimonial-card,
  .mod-card,
  .download-card {
    padding: 24px;
  }

  .hero-mockup-body {
    grid-template-columns: 1fr;
    min-height: auto;
  }

  .hero-sidebar {
    flex-direction: row;
    overflow-x: auto;
    gap: 6px;
  }

  .hero-sidebar-item {
    flex-shrink: 0;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

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

  .stats-band,
  .hero-stats,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .hero-actions {
    flex-direction: column;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .download-modal-body {
    padding: 20px;
  }
}