/* ============================================
   Stats 官方网站 - 共享样式表
   配色：深色科技风，呼应 Logo
   - 主背景 #1A1A1A
   - 卡片 #232323 / #2A2A2A
   - 强调蓝 #3983F6 (Logo 蓝)
   - 强调橙 #ED5645 (Logo 橙)
   - 文字主 #F5F7FA / 次 #A8B0BD
   ============================================ */

/* CSS 变量 */
:root {
  --bg-primary: #1A1A1A;
  --bg-secondary: #232323;
  --bg-tertiary: #2A2A2A;
  --bg-elevated: #303030;
  --bg-hover: #383838;

  --accent-blue: #3983F6;
  --accent-blue-hover: #5A9BFF;
  --accent-blue-soft: rgba(57, 131, 246, 0.12);
  --accent-orange: #ED5645;
  --accent-orange-soft: rgba(237, 86, 69, 0.12);

  --text-primary: #F5F7FA;
  --text-secondary: #A8B0BD;
  --text-muted: #6B7280;

  --border-color: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.16);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 32px rgba(57, 131, 246, 0.25);

  --container-max: 1200px;
  --header-height: 64px;

  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC",
    "Helvetica Neue", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans SC",
    sans-serif;
  --font-mono: "SF Mono", "JetBrains Mono", "Fira Code", Menlo, Monaco, Consolas, monospace;

  --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

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

ul,
ol {
  list-style: none;
}

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

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

.section {
  padding: 96px 0;
  position: relative;
}

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

.section-title {
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
  line-height: 1.2;
}

.section-subtitle {
  font-size: 18px;
  color: var(--text-secondary);
  max-width: 640px;
  margin-bottom: 56px;
}

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

.text-center .section-subtitle {
  margin-left: auto;
  margin-right: auto;
}

.eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-blue);
  padding: 6px 14px;
  background: var(--accent-blue-soft);
  border-radius: 999px;
  margin-bottom: 20px;
}

/* ============== Header ============== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background: rgba(26, 26, 26, 0.85);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--border-color);
}

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

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.brand img {
  width: 40px;
  height: 40px;
  border-radius: 7px;
}

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

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

.main-nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.main-nav a {
  font-size: 15px;
  color: var(--text-secondary);
  font-weight: 500;
  position: relative;
  padding: 4px 0;
}

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

.main-nav a.active::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -4px;
  height: 2px;
  background: var(--accent-blue);
  border-radius: 1px;
}

.header-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 18px;
  font-size: 14px;
  font-weight: 600;
  background: var(--accent-blue);
  color: #fff;
  border-radius: var(--radius-md);
  transition: background var(--transition), transform var(--transition);
}

.header-cta:hover {
  background: var(--accent-blue-hover);
  color: #fff;
  transform: translateY(-1px);
}

.menu-toggle {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
}

.menu-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text-primary);
  position: relative;
  transition: var(--transition);
}

.menu-toggle span::before,
.menu-toggle span::after {
  content: "";
  position: absolute;
  left: 0;
  width: 20px;
  height: 2px;
  background: var(--text-primary);
  transition: var(--transition);
}

.menu-toggle span::before {
  top: -6px;
}

.menu-toggle span::after {
  top: 6px;
}

.menu-toggle.open span {
  background: transparent;
}

.menu-toggle.open span::before {
  top: 0;
  transform: rotate(45deg);
}

.menu-toggle.open span::after {
  top: 0;
  transform: rotate(-45deg);
}

/* ============== Buttons ============== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 600;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  transition: all var(--transition);
  cursor: pointer;
  white-space: nowrap;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--accent-blue);
  color: #fff;
  box-shadow: 0 4px 14px rgba(57, 131, 246, 0.35);
}

.btn-primary:hover {
  background: var(--accent-blue-hover);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(57, 131, 246, 0.45);
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border-color: var(--border-strong);
}

.btn-secondary:hover {
  background: var(--bg-elevated);
  color: var(--text-primary);
  border-color: var(--accent-blue);
}

.btn-ghost {
  background: transparent;
  color: var(--text-primary);
  border-color: var(--border-strong);
}

.btn-ghost:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.btn-lg {
  font-size: 16px;
  padding: 14px 32px;
}

.btn .icon {
  width: 18px;
  height: 18px;
}

/* ============== Hero ============== */
.hero {
  position: relative;
  padding: 96px 0 80px;
  overflow: hidden;
}

.hero-bg-glow {
  position: absolute;
  top: -200px;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 600px;
  background: radial-gradient(
    ellipse at center,
    rgba(57, 131, 246, 0.18) 0%,
    rgba(57, 131, 246, 0) 60%
  );
  pointer-events: none;
  z-index: 0;
}

.hero-bg-glow.orange {
  top: auto;
  bottom: -200px;
  left: 20%;
  background: radial-gradient(
    ellipse at center,
    rgba(237, 86, 69, 0.12) 0%,
    rgba(237, 86, 69, 0) 60%
  );
}

.hero-inner {
  position: relative;
  z-index: 1;
  text-align: center;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--text-secondary);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  padding: 6px 14px;
  border-radius: 999px;
  margin-bottom: 24px;
}

.hero-eyebrow .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-orange);
  box-shadow: 0 0 12px var(--accent-orange);
}

.hero h1 {
  font-size: clamp(40px, 6vw, 72px);
  font-weight: 800;
  letter-spacing: -0.035em;
  line-height: 1.05;
  margin-bottom: 24px;
  background: linear-gradient(180deg, #ffffff 0%, #B8C5D6 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero h1 .accent {
  background: linear-gradient(135deg, var(--accent-blue) 0%, var(--accent-orange) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p.lead {
  font-size: clamp(17px, 2vw, 20px);
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto 40px;
  line-height: 1.6;
}

.hero-cta-group {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 56px;
}

.hero-stats {
  display: flex;
  gap: 48px;
  justify-content: center;
  flex-wrap: wrap;
  padding: 24px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  max-width: 720px;
  margin: 0 auto;
}

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

.hero-stat-num {
  font-size: 32px;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.hero-stat-num .unit {
  color: var(--accent-blue);
}

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

/* ============== Hero Preview (Mockup) ============== */
.hero-preview {
  margin-top: 72px;
  position: relative;
}

.menubar-mock {
  max-width: 920px;
  margin: 0 auto;
  background: linear-gradient(180deg, #2A2A2A 0%, #232323 100%);
  border: 1px solid var(--border-strong);
  border-radius: 14px 14px 0 0;
  padding: 10px 18px;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 18px;
  font-size: 13px;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
  box-shadow: var(--shadow-md);
}

.menubar-mock .mb-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.menubar-mock .mb-icon {
  width: 14px;
  height: 14px;
  border-radius: 3px;
  display: inline-block;
}

.menubar-mock .mb-bar {
  width: 22px;
  height: 8px;
  background: var(--bg-elevated);
  border-radius: 2px;
  overflow: hidden;
  position: relative;
}

.menubar-mock .mb-bar::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  background: var(--accent-blue);
  width: var(--w, 50%);
  border-radius: 2px;
}

.menubar-mock .mb-bar.orange::after {
  background: var(--accent-orange);
}

.menubar-mock .battery {
  display: inline-block;
  width: 22px;
  height: 11px;
  border: 1px solid var(--text-secondary);
  border-radius: 3px;
  position: relative;
  padding: 1px;
}

.menubar-mock .battery::after {
  content: "";
  position: absolute;
  right: -3px;
  top: 3px;
  width: 2px;
  height: 5px;
  background: var(--text-secondary);
  border-radius: 0 1px 1px 0;
}

.menubar-mock .battery span {
  display: block;
  width: 75%;
  height: 100%;
  background: var(--accent-blue);
  border-radius: 1px;
}

.preview-window {
  max-width: 920px;
  margin: 0 auto;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-top: none;
  border-radius: 0 0 14px 14px;
  padding: 32px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  box-shadow: var(--shadow-lg);
}

.preview-card {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 18px;
}

.preview-card-title {
  font-size: 12px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.preview-card-value {
  font-size: 28px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
  font-variant-numeric: tabular-nums;
}

.preview-card-value .unit {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  margin-left: 4px;
}

.spark {
  height: 32px;
  display: flex;
  align-items: flex-end;
  gap: 3px;
}

.spark span {
  flex: 1;
  background: var(--accent-blue);
  border-radius: 1px;
  opacity: 0.8;
}

.spark.orange span {
  background: var(--accent-orange);
}

/* ============== Features Grid ============== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}

.feature-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent-blue), transparent);
  opacity: 0;
  transition: opacity var(--transition);
}

.feature-card:hover {
  border-color: var(--border-strong);
  transform: translateY(-4px);
  background: var(--bg-tertiary);
}

.feature-card:hover::before {
  opacity: 1;
}

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

.feature-icon.orange {
  background: var(--accent-orange-soft);
  color: var(--accent-orange);
}

.feature-card h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 10px;
  letter-spacing: -0.01em;
}

.feature-card p {
  font-size: 14.5px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ============== Scenarios (Use Cases) ============== */
.scenario-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}

.scenario-card {
  background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  position: relative;
  overflow: hidden;
  transition: all var(--transition);
}

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

.scenario-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 999px;
  margin-bottom: 16px;
  background: var(--accent-blue-soft);
  color: var(--accent-blue);
}

.scenario-card.dev .scenario-tag {
  background: var(--accent-blue-soft);
  color: var(--accent-blue);
}

.scenario-card.design .scenario-tag {
  background: var(--accent-orange-soft);
  color: var(--accent-orange);
}

.scenario-card.video .scenario-tag {
  background: rgba(168, 85, 247, 0.12);
  color: #c084fc;
}

.scenario-card.data .scenario-tag {
  background: rgba(34, 197, 94, 0.12);
  color: #4ade80;
}

.scenario-card h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 10px;
}

.scenario-card p {
  font-size: 14.5px;
  color: var(--text-secondary);
  margin-bottom: 18px;
  line-height: 1.6;
}

.scenario-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.scenario-list li {
  font-size: 13.5px;
  color: var(--text-secondary);
  padding-left: 22px;
  position: relative;
}

.scenario-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent-blue);
  opacity: 0.7;
}

.scenario-card.design .scenario-list li::before {
  background: var(--accent-orange);
}

.scenario-card.video .scenario-list li::before {
  background: #c084fc;
}

.scenario-card.data .scenario-list li::before {
  background: #4ade80;
}

/* ============== Testimonials ============== */
.testimonial-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 20px;
}

.testimonial-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  transition: all var(--transition);
}

.testimonial-card:hover {
  border-color: var(--border-strong);
  background: var(--bg-tertiary);
}

.testimonial-stars {
  display: flex;
  gap: 2px;
  color: #fbbf24;
  font-size: 16px;
  letter-spacing: 2px;
}

.testimonial-text {
  font-size: 15px;
  color: var(--text-primary);
  line-height: 1.65;
  flex: 1;
}

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

.testimonial-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-orange));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 600;
  font-size: 15px;
  flex-shrink: 0;
}

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

.testimonial-role {
  font-size: 12.5px;
  color: var(--text-secondary);
}

/* ============== Download CTA ============== */
.cta-banner {
  background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 64px 48px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-banner::before {
  content: "";
  position: absolute;
  top: -50%;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(57, 131, 246, 0.18) 0%, transparent 60%);
  pointer-events: none;
}

.cta-banner > * {
  position: relative;
  z-index: 1;
}

.cta-banner h2 {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.cta-banner p {
  font-size: 17px;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto 32px;
}

.cta-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ============== Footer ============== */
.site-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 64px 0 32px;
  margin-top: 64px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand .brand {
  margin-bottom: 16px;
}

.footer-brand p {
  font-size: 14px;
  color: var(--text-secondary);
  max-width: 280px;
  line-height: 1.6;
}

.footer-col h4 {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 18px;
  letter-spacing: 0.02em;
}

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

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

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

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

.footer-bottom a {
  color: var(--text-muted);
}

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

.footer-social {
  display: flex;
  gap: 12px;
}

.footer-social a {
  width: 32px;
  height: 32px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
}

.footer-social a:hover {
  background: var(--accent-blue);
  color: #fff;
  border-color: var(--accent-blue);
}

/* ============== Download Modal ============== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 24px;
  opacity: 0;
  transition: opacity var(--transition);
}

.modal-overlay.open {
  display: flex;
  opacity: 1;
}

.modal {
  background: var(--bg-secondary);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-xl);
  max-width: 640px;
  width: 100%;
  padding: 40px;
  position: relative;
  box-shadow: var(--shadow-lg);
  transform: translateY(20px) scale(0.98);
  transition: transform var(--transition);
  max-height: 90vh;
  overflow-y: auto;
}

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

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--bg-tertiary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  color: var(--text-secondary);
  transition: all var(--transition);
}

.modal-close:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.modal-logo {
  width: 56px;
  height: 56px;
  border-radius: 12px;
  margin-bottom: 18px;
}

.modal h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 8px;
}

.modal p.modal-desc {
  font-size: 14.5px;
  color: var(--text-secondary);
  margin-bottom: 28px;
  line-height: 1.6;
}

.qr-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 28px;
}

.qr-card {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px;
  text-align: center;
  transition: all var(--transition);
}

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

.qr-card img {
  width: 140px;
  height: 140px;
  margin: 0 auto 12px;
  background: #fff;
  padding: 8px;
  border-radius: var(--radius-sm);
}

.qr-card-title {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 4px;
}

.qr-card-desc {
  font-size: 12.5px;
  color: var(--text-secondary);
  line-height: 1.5;
}

.modal-meta {
  display: flex;
  justify-content: center;
  gap: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--border-color);
  font-size: 13px;
  color: var(--text-secondary);
  flex-wrap: wrap;
}

.modal-meta strong {
  color: var(--text-primary);
  font-weight: 600;
}

/* ============== Breadcrumb ============== */
.breadcrumb {
  padding: 28px 0 0;
  font-size: 13px;
  color: var(--text-secondary);
}

.breadcrumb ol {
  display: flex;
  align-items: center;
  gap: 8px;
}

.breadcrumb li::after {
  content: "/";
  margin-left: 8px;
  color: var(--text-muted);
}

.breadcrumb li:last-child::after {
  content: "";
}

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

/* ============== Page Header ============== */
.page-header {
  padding: 56px 0 40px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.page-header .hero-bg-glow {
  top: -100px;
}

.page-header h1 {
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
  line-height: 1.1;
}

.page-header p {
  font-size: 18px;
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto;
  line-height: 1.6;
}

/* ============== Detailed Feature Sections ============== */
.feature-detail {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
  margin-bottom: 96px;
}

.feature-detail:last-child {
  margin-bottom: 0;
}

.feature-detail.reverse .feature-detail-content {
  order: 2;
}

.feature-detail-content h3 {
  font-size: 30px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.feature-detail-content p {
  font-size: 16px;
  color: var(--text-secondary);
  margin-bottom: 20px;
  line-height: 1.7;
}

.feature-detail-content ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 24px;
}

.feature-detail-content li {
  font-size: 14.5px;
  color: var(--text-secondary);
  padding-left: 28px;
  position: relative;
}

.feature-detail-content li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 0;
  width: 20px;
  height: 20px;
  background: var(--accent-blue-soft);
  color: var(--accent-blue);
  border-radius: 50%;
  font-size: 12px;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.feature-detail-visual {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  min-height: 320px;
  position: relative;
  overflow: hidden;
}

/* Visualizations */
.metric-display {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.metric-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.metric-row .label {
  font-size: 13px;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.metric-row .label-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-blue);
}

.metric-row .value {
  font-size: 18px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--text-primary);
}

.metric-row .value .unit {
  font-size: 12px;
  color: var(--text-secondary);
  margin-left: 4px;
  font-weight: 500;
}

.metric-bar {
  height: 6px;
  background: var(--bg-elevated);
  border-radius: 3px;
  overflow: hidden;
  margin-top: 6px;
}

.metric-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-blue), var(--accent-blue-hover));
  border-radius: 3px;
  transition: width 0.6s ease;
}

.metric-bar-fill.orange {
  background: linear-gradient(90deg, var(--accent-orange), #ff7a6b);
}

/* ============== Download Page ============== */
.download-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 56px;
}

.download-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: all var(--transition);
}

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

.download-card.recommended {
  border-color: var(--accent-blue);
  background: linear-gradient(180deg, rgba(57, 131, 246, 0.06) 0%, var(--bg-secondary) 100%);
}

.download-card-badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  padding: 3px 10px;
  background: var(--accent-blue);
  color: #fff;
  border-radius: 999px;
  letter-spacing: 0.05em;
  margin-bottom: 16px;
}

.download-card h3 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 8px;
}

.download-card .desc {
  font-size: 14.5px;
  color: var(--text-secondary);
  margin-bottom: 20px;
  line-height: 1.6;
}

.download-card .cmd {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  font-family: var(--font-mono);
  font-size: 13.5px;
  color: var(--text-primary);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.download-card .cmd code {
  flex: 1;
  overflow-x: auto;
  white-space: nowrap;
}

.copy-btn {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  font-size: 12px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition);
  flex-shrink: 0;
}

.copy-btn:hover {
  background: var(--accent-blue);
  color: #fff;
  border-color: var(--accent-blue);
}

.download-card .meta-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 24px;
}

.download-card .meta-list li {
  font-size: 13.5px;
  color: var(--text-secondary);
  padding-left: 22px;
  position: relative;
}

.download-card .meta-list li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--accent-blue);
}

.sys-requirements {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px;
  margin-bottom: 56px;
}

.sys-requirements h3 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 24px;
}

.req-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}

.req-item {
  padding: 18px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.req-item .req-label {
  font-size: 12.5px;
  color: var(--text-secondary);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.req-item .req-value {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
}

.install-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
  counter-reset: step;
}

.install-step {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  position: relative;
  counter-increment: step;
}

.install-step::before {
  content: counter(step);
  position: absolute;
  top: 24px;
  right: 24px;
  width: 32px;
  height: 32px;
  background: var(--accent-blue-soft);
  color: var(--accent-blue);
  border-radius: 50%;
  font-size: 16px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.install-step h4 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 10px;
  padding-right: 40px;
}

.install-step p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ============== FAQ ============== */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition);
}

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

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

.faq-question .toggle {
  font-size: 20px;
  color: var(--accent-blue);
  transition: transform var(--transition);
  flex-shrink: 0;
}

.faq-item.open .faq-question .toggle {
  transform: rotate(45deg);
}

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

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

.faq-answer-inner {
  padding: 0 24px 22px;
  font-size: 14.5px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ============== About Page ============== */
.about-hero-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 48px;
  align-items: center;
  margin-bottom: 80px;
}

.about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.about-stat-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  text-align: center;
}

.about-stat-card .num {
  font-size: 36px;
  font-weight: 800;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-orange));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 6px;
}

.about-stat-card .label {
  font-size: 13px;
  color: var(--text-secondary);
}

.value-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

.value-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
}

.value-card .icon-wrap {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: var(--accent-blue-soft);
  color: var(--accent-blue);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}

.value-card h4 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 10px;
}

.value-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.timeline {
  position: relative;
  padding-left: 32px;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 4px;
  bottom: 4px;
  width: 2px;
  background: var(--border-strong);
}

.timeline-item {
  position: relative;
  padding-bottom: 32px;
}

.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(--accent-blue);
  box-shadow: 0 0 0 4px var(--bg-primary), 0 0 0 5px var(--accent-blue);
}

.timeline-date {
  font-size: 12.5px;
  color: var(--accent-blue);
  font-weight: 600;
  letter-spacing: 0.04em;
  margin-bottom: 4px;
}

.timeline-title {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 6px;
}

.timeline-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.contribution-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}

.contribution-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  text-align: center;
  transition: all var(--transition);
}

.contribution-card:hover {
  border-color: var(--accent-blue);
  transform: translateY(-4px);
}

.contribution-card .icon-wrap {
  width: 48px;
  height: 48px;
  margin: 0 auto 16px;
  background: var(--accent-blue-soft);
  color: var(--accent-blue);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.contribution-card h4 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 8px;
}

.contribution-card p {
  font-size: 13.5px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 14px;
}

.contribution-card a {
  font-size: 13.5px;
  font-weight: 600;
  color: var(--accent-blue);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.contribution-card a:hover {
  color: var(--accent-blue-hover);
}

/* ============== Animations ============== */
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-up {
  animation: fadeUp 0.6s ease both;
}

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

.pulse {
  animation: pulse 2s ease-in-out infinite;
}

/* ============== Responsive ============== */
@media (max-width: 960px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

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

  .feature-detail {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .feature-detail.reverse .feature-detail-content {
    order: 0;
  }

  .about-hero-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}

@media (max-width: 720px) {
  .main-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    flex-direction: column;
    align-items: flex-start;
    padding: 16px 24px;
    gap: 4px;
    transform: translateY(-200%);
    transition: transform var(--transition);
    box-shadow: var(--shadow-md);
  }

  .main-nav.open {
    transform: translateY(0);
  }

  .main-nav a {
    width: 100%;
    padding: 12px 0;
  }

  .header-cta {
    display: none;
  }

  .menu-toggle {
    display: inline-flex;
  }

  .section {
    padding: 64px 0;
  }

  .hero {
    padding: 48px 0 56px;
  }

  .hero-stats {
    gap: 24px;
    padding: 20px;
  }

  .hero-stat-num {
    font-size: 26px;
  }

  .preview-window {
    grid-template-columns: 1fr;
    padding: 20px;
  }

  .menubar-mock {
    overflow-x: auto;
    justify-content: flex-start;
  }

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

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

  .modal {
    padding: 28px 20px;
  }

  .cta-banner {
    padding: 40px 24px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

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

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  html {
    scroll-behavior: auto;
  }
}

/* Focus states */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent-blue);
  outline-offset: 2px;
  border-radius: 4px;
}

/* Skip to content link for accessibility */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent-blue);
  color: #fff;
  padding: 12px 18px;
  z-index: 2000;
  border-radius: 0 0 var(--radius-md) 0;
}

.skip-link:focus {
  left: 0;
}