/* ========================================
   Microsoft Edge 浏览器介绍站 - 样式表
   Color: Edge Blue #0078D4 / Teal #00B7C3
   ======================================== */

/* --- CSS Variables --- */
:root {
  --primary: #0078D4;
  --primary-dark: #005a9e;
  --primary-light: #4ba0e4;
  --secondary: #00B7C3;
  --secondary-dark: #009ca6;
  --accent: #5c2d91;
  --dark: #1a1a2e;
  --dark-2: #16213e;
  --text-primary: #1a1a2e;
  --text-secondary: #4a5568;
  --text-light: #718096;
  --bg-white: #ffffff;
  --bg-light: #f0f8ff;
  --bg-light-2: #e8f4fd;
  --bg-gray: #f7fafc;
  --border: #e2e8f0;
  --border-light: #edf2f7;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 14px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 30px rgba(0,0,0,0.12);
  --shadow-xl: 0 20px 50px rgba(0,0,0,0.15);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-main: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-main);
  color: var(--text-primary);
  background: var(--bg-white);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

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

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

ul, ol {
  list-style: none;
}

/* --- Utility --- */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 72px 0;
}

.section-sm {
  padding: 48px 0;
}

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

.text-gradient {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* --- Fade-in Animation --- */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

.fade-in-left {
  opacity: 0;
  transform: translateX(-30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

.fade-in-right {
  opacity: 0;
  transform: translateX(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* --- Header / Navigation --- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-light);
  transition: var(--transition);
}

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

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.header-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.header-logo img {
  width: 32px;
  height: 32px;
}

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

.header-nav a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 4px 0;
}

.header-nav a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  border-radius: 1px;
  transition: width 0.3s ease;
}

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

.header-nav a:hover::after,
.header-nav a.active::after {
  width: 100%;
}

.header-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 20px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff !important;
  border-radius: 24px;
  font-size: 0.85rem;
  font-weight: 600;
  transition: var(--transition);
}

.header-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(0,120,212,0.35);
  color: #fff !important;
}

.header-cta::after {
  display: none !important;
}

/* Mobile menu toggle */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  background: none;
  border: none;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

/* --- Hero Section --- */
.hero {
  padding: 120px 0 60px;
  background: linear-gradient(170deg, var(--bg-light) 0%, var(--bg-white) 50%, var(--bg-light-2) 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(0,183,195,0.08) 0%, transparent 70%);
  border-radius: 50%;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(0,120,212,0.06) 0%, transparent 70%);
  border-radius: 50%;
}

.hero-inner {
  display: flex;
  align-items: center;
  gap: 48px;
  position: relative;
  z-index: 1;
}

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

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: rgba(0,120,212,0.08);
  border: 1px solid rgba(0,120,212,0.15);
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 20px;
}

.hero-badge .dot {
  width: 6px;
  height: 6px;
  background: var(--secondary);
  border-radius: 50%;
  animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero h1 {
  font-size: 2.8rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.hero h1 .highlight {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 28px;
  max-width: 520px;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 28px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  text-decoration: none;
  font-family: var(--font-main);
  line-height: 1.4;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  box-shadow: 0 4px 16px rgba(0,120,212,0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(0,120,212,0.4);
  color: #fff;
}

.btn-secondary {
  background: var(--bg-white);
  color: var(--primary);
  border: 2px solid var(--border);
}

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

.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
}

.btn-outline:hover {
  background: var(--primary);
  color: #fff;
  transform: translateY(-2px);
}

.btn-quark {
  background: linear-gradient(135deg, #6f33ff, #4a1dcc);
  color: #fff;
  box-shadow: 0 4px 16px rgba(111,51,255,0.3);
}

.btn-quark:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(111,51,255,0.4);
  color: #fff;
}

.btn-baidu {
  background: linear-gradient(135deg, #2932e1, #1a22b0);
  color: #fff;
  box-shadow: 0 4px 16px rgba(41,50,225,0.3);
}

.btn-baidu:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(41,50,225,0.4);
  color: #fff;
}

.hero-image {
  flex: 1;
  min-width: 0;
  position: relative;
}

.hero-image img {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  width: 100%;
}

.hero-image .float-badge {
  position: absolute;
  background: var(--bg-white);
  border-radius: var(--radius-md);
  padding: 10px 16px;
  box-shadow: var(--shadow-lg);
  font-size: 0.8rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
  animation: float 3s ease-in-out infinite;
}

.hero-image .float-badge.top-right {
  top: -12px;
  right: -12px;
  animation-delay: 0s;
}

.hero-image .float-badge.bottom-left {
  bottom: -12px;
  left: -12px;
  animation-delay: 1.5s;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.float-badge .badge-icon {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
}

.float-badge .badge-icon.blue { background: rgba(0,120,212,0.1); color: var(--primary); }
.float-badge .badge-icon.green { background: rgba(0,183,195,0.1); color: var(--secondary); }

/* --- Stats Bar --- */
.stats-bar {
  background: var(--bg-white);
  border-top: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
  padding: 32px 0;
}

.stat-item .stat-number {
  font-size: 2rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.stat-item .stat-label {
  font-size: 0.85rem;
  color: var(--text-light);
  margin-top: 4px;
}

/* --- Section Header --- */
.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-header .label {
  display: inline-block;
  padding: 4px 14px;
  background: rgba(0,120,212,0.08);
  color: var(--primary);
  border-radius: 16px;
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 12px;
  letter-spacing: 0.05em;
}

.section-header h2 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.section-header p {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.7;
}

/* --- Feature Cards Grid --- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg-white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  opacity: 0;
  transition: opacity 0.3s ease;
}

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

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

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  margin-bottom: 16px;
}

.feature-icon.blue { background: rgba(0,120,212,0.1); color: var(--primary); }
.feature-icon.teal { background: rgba(0,183,195,0.1); color: var(--secondary); }
.feature-icon.purple { background: rgba(92,45,145,0.1); color: var(--accent); }
.feature-icon.green { background: rgba(16,185,129,0.1); color: #10b981; }
.feature-icon.orange { background: rgba(245,158,11,0.1); color: #f59e0b; }
.feature-icon.red { background: rgba(239,68,68,0.1); color: #ef4444; }

.feature-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* --- Screenshot Gallery --- */
.gallery-section {
  background: var(--bg-light);
}

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

.gallery-item {
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
  background: var(--bg-white);
}

.gallery-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.gallery-item img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.gallery-item:hover img {
  transform: scale(1.03);
}

.gallery-item .gallery-caption {
  padding: 14px 18px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
}

.gallery-item .gallery-caption span {
  display: block;
  font-size: 0.8rem;
  color: var(--text-light);
  font-weight: 400;
  margin-top: 2px;
}

/* --- Platform Cards (Download Page) --- */
.platform-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.platform-card {
  background: var(--bg-white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 32px 28px;
  text-align: center;
  transition: var(--transition);
}

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

.platform-icon {
  font-size: 48px;
  margin-bottom: 16px;
  line-height: 1;
}

.platform-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.platform-card .version {
  font-size: 0.8rem;
  color: var(--text-light);
  margin-bottom: 16px;
}

.platform-card .btn {
  width: 100%;
  margin-bottom: 12px;
}

.platform-card .size-info {
  font-size: 0.8rem;
  color: var(--text-light);
}

/* --- System Requirements --- */
.req-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--bg-white);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.req-table th,
.req-table td {
  padding: 14px 20px;
  text-align: left;
  font-size: 0.9rem;
  border-bottom: 1px solid var(--border-light);
}

.req-table th {
  background: var(--bg-light);
  font-weight: 700;
  color: var(--text-primary);
  font-size: 0.85rem;
}

.req-table td {
  color: var(--text-secondary);
}

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

/* --- Feature Detail (Features Page) --- */
.feature-detail {
  display: flex;
  align-items: center;
  gap: 48px;
  margin-bottom: 64px;
}

.feature-detail.reverse {
  flex-direction: row-reverse;
}

.feature-detail-content {
  flex: 1;
  min-width: 0;
}

.feature-detail-content .label {
  display: inline-block;
  padding: 4px 12px;
  background: rgba(0,120,212,0.08);
  color: var(--primary);
  border-radius: 12px;
  font-size: 0.75rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.feature-detail-content h3 {
  font-size: 1.6rem;
  font-weight: 800;
  margin-bottom: 12px;
}

.feature-detail-content p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
}

.feature-detail-content ul {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.feature-detail-content ul li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.feature-detail-content ul li .check {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: rgba(0,183,195,0.1);
  color: var(--secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  flex-shrink: 0;
}

.feature-detail-image {
  flex: 1;
  min-width: 0;
}

.feature-detail-image img {
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  width: 100%;
}

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

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

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

.faq-item.active {
  border-color: var(--primary);
  box-shadow: 0 2px 12px rgba(0,120,212,0.1);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px;
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  gap: 16px;
  user-select: none;
}

.faq-question:hover {
  color: var(--primary);
}

.faq-toggle {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--bg-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  color: var(--text-light);
  transition: var(--transition);
  flex-shrink: 0;
}

.faq-item.active .faq-toggle {
  background: var(--primary);
  color: #fff;
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
}

.faq-answer-inner {
  padding: 0 24px 18px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* --- CTA Section --- */
.cta-section {
  background: linear-gradient(135deg, var(--dark) 0%, var(--dark-2) 100%);
  color: #fff;
  text-align: center;
  padding: 64px 0;
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -20%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(0,120,212,0.15) 0%, transparent 70%);
  border-radius: 50%;
}

.cta-section::after {
  content: '';
  position: absolute;
  bottom: -50%;
  right: -20%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(0,183,195,0.1) 0%, transparent 70%);
  border-radius: 50%;
}

.cta-section h2 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 12px;
  position: relative;
  z-index: 1;
}

.cta-section p {
  font-size: 1.05rem;
  color: rgba(255,255,255,0.7);
  margin-bottom: 28px;
  position: relative;
  z-index: 1;
}

.cta-section .btn {
  position: relative;
  z-index: 1;
}

.btn-white {
  background: #fff;
  color: var(--primary);
}

.btn-white:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(255,255,255,0.2);
  color: var(--primary);
}

/* --- Footer --- */
.site-footer {
  background: var(--bg-gray);
  border-top: 1px solid var(--border-light);
  padding: 40px 0 24px;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 40px;
  margin-bottom: 32px;
}

.footer-brand {
  max-width: 300px;
}

.footer-brand .logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.footer-brand .logo img {
  width: 28px;
  height: 28px;
}

.footer-brand p {
  font-size: 0.85rem;
  color: var(--text-light);
  line-height: 1.6;
}

.footer-links {
  display: flex;
  gap: 48px;
}

.footer-col h4 {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 14px;
}

.footer-col a {
  display: block;
  font-size: 0.85rem;
  color: var(--text-light);
  margin-bottom: 8px;
}

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

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

.footer-bottom p {
  font-size: 0.8rem;
  color: var(--text-light);
}

.footer-disclaimer {
  font-size: 0.78rem;
  color: var(--text-light);
  text-align: center;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px dashed var(--border);
}

/* --- Page Hero (Sub Pages) --- */
.page-hero {
  padding: 110px 0 48px;
  background: linear-gradient(170deg, var(--bg-light) 0%, var(--bg-white) 100%);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.page-hero::before {
  content: '';
  position: absolute;
  top: -40%;
  right: -15%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(0,120,212,0.06) 0%, transparent 70%);
  border-radius: 50%;
}

.page-hero h1 {
  font-size: 2.4rem;
  font-weight: 800;
  margin-bottom: 12px;
  position: relative;
  z-index: 1;
}

.page-hero p {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.7;
  position: relative;
  z-index: 1;
}

/* --- Comparison Table --- */
.comparison-section {
  background: var(--bg-light);
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--bg-white);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.comparison-table th,
.comparison-table td {
  padding: 14px 20px;
  text-align: center;
  font-size: 0.9rem;
  border-bottom: 1px solid var(--border-light);
}

.comparison-table th {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  font-weight: 700;
  font-size: 0.85rem;
}

.comparison-table th:first-child {
  text-align: left;
}

.comparison-table td:first-child {
  text-align: left;
  font-weight: 600;
  color: var(--text-primary);
}

.comparison-table td {
  color: var(--text-secondary);
}

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

.comparison-table .check-yes {
  color: #10b981;
  font-weight: 700;
}

.comparison-table .check-no {
  color: #ef4444;
}

/* --- Back to Top --- */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff;
  border: none;
  border-radius: 50%;
  font-size: 18px;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: var(--transition);
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
}

.back-to-top.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

/* --- QR Breathing Border --- */
@keyframes qr-breathe {
  0%, 100% {
    border-color: rgba(0,120,212,0.3);
    box-shadow: 0 0 6px rgba(0,120,212,0.1);
  }
  50% {
    border-color: rgba(0,183,195,0.6);
    box-shadow: 0 0 14px rgba(0,183,195,0.2);
  }
}

.qr-breathing {
  border: 3px solid rgba(0,120,212,0.3);
  border-radius: 10px;
  animation: qr-breathe 2.5s ease-in-out infinite;
  padding: 6px;
  background: #fff;
  display: inline-block;
}

.qr-breathing img {
  display: block;
  border-radius: 6px;
}

/* --- Download Modal --- */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0,0,0,0.55);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 2000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

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

.modal-box {
  background: #fff;
  border-radius: var(--radius-lg);
  max-width: 440px;
  width: 100%;
  padding: 36px 32px 28px;
  position: relative;
  box-shadow: 0 24px 60px rgba(0,0,0,0.25);
  animation: modal-enter 0.3s ease;
  text-align: center;
}

@keyframes modal-enter {
  from { opacity: 0; transform: translateY(20px) scale(0.96); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.modal-close {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 32px;
  height: 32px;
  border: none;
  background: var(--bg-light);
  border-radius: 50%;
  font-size: 18px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-light);
  transition: var(--transition);
}

.modal-close:hover {
  background: #fee2e2;
  color: #ef4444;
}

.modal-box .modal-icon {
  font-size: 36px;
  margin-bottom: 12px;
}

.modal-box h3 {
  font-size: 1.3rem;
  font-weight: 800;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.modal-box .modal-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 20px;
}

.modal-box .qr-breathing {
  margin-bottom: 16px;
}

.modal-box .modal-tip {
  font-size: 0.82rem;
  color: var(--text-light);
  line-height: 1.6;
  margin-bottom: 16px;
  padding: 12px 16px;
  background: var(--bg-light);
  border-radius: var(--radius-sm);
  text-align: left;
}

.modal-box .modal-tip strong {
  color: var(--text-primary);
}

.modal-box .modal-url {
  font-size: 0.75rem;
  color: var(--text-light);
  word-break: break-all;
  padding: 8px 12px;
  background: var(--bg-gray);
  border-radius: 6px;
  margin-bottom: 4px;
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .hero-inner {
    flex-direction: column;
    text-align: center;
  }
  .hero-desc {
    margin-left: auto;
    margin-right: auto;
  }
  .hero-actions {
    justify-content: center;
  }
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .feature-detail {
    flex-direction: column;
  }
  .feature-detail.reverse {
    flex-direction: column;
  }
  .footer-inner {
    flex-direction: column;
  }
}

@media (max-width: 768px) {
  .hero h1 {
    font-size: 2rem;
  }
  .section-header h2 {
    font-size: 1.6rem;
  }
  .page-hero h1 {
    font-size: 1.8rem;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .gallery-grid {
    grid-template-columns: 1fr;
  }
  .platform-grid {
    grid-template-columns: 1fr;
  }
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }
  .header-nav {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--bg-white);
    flex-direction: column;
    padding: 20px 24px;
    gap: 16px;
    border-bottom: 1px solid var(--border-light);
    box-shadow: var(--shadow-md);
  }
  .header-nav.open {
    display: flex;
  }
  .menu-toggle {
    display: flex;
  }
  .footer-links {
    flex-direction: column;
    gap: 24px;
  }
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
  .comparison-table {
    font-size: 0.8rem;
  }
  .comparison-table th,
  .comparison-table td {
    padding: 10px 12px;
  }
}

@media (max-width: 480px) {
  .hero {
    padding: 100px 0 40px;
  }
  .hero h1 {
    font-size: 1.7rem;
  }
  .hero-actions {
    flex-direction: column;
  }
  .hero-actions .btn {
    width: 100%;
  }
  .section {
    padding: 48px 0;
  }
  .stat-item .stat-number {
    font-size: 1.5rem;
  }
}