/* ============================================================
   A6 Payment — 2026 FinTech Design System
   ============================================================ */

/* ----- CSS Variables ----- */
:root {
  --color-primary: #2563eb;
  --color-primary-light: #3b82f6;
  --color-primary-dark: #1d4ed8;
  --color-accent: #06b6d4;
  --color-accent-dark: #0891b2;
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-danger: #ef4444;
  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-surface-hover: #f1f5f9;
  --color-text: #0f172a;
  --color-text-secondary: #475569;
  --color-text-muted: #94a3b8;
  --color-border: #e2e8f0;
  --color-border-light: #f1f5f9;

  --gradient-primary: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
  --gradient-hero: linear-gradient(160deg, #0f172a 0%, #1e293b 40%, #0f172a 100%);
  --gradient-accent: linear-gradient(135deg, #06b6d4 0%, #3b82f6 100%);
  --gradient-card: linear-gradient(145deg, rgba(255,255,255,0.9) 0%, rgba(255,255,255,0.7) 100%);

  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.05), 0 2px 4px rgba(0,0,0,0.04);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.08), 0 4px 8px rgba(0,0,0,0.04);
  --shadow-xl: 0 20px 50px rgba(0,0,0,0.12), 0 8px 16px rgba(0,0,0,0.06);
  --shadow-glow: 0 0 40px rgba(37,99,235,0.15);

  --transition-fast: 150ms ease;
  --transition: 250ms ease;
  --transition-slow: 400ms ease;

  --font-sans: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', 'Noto Sans', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Cascadia Code', Consolas, 'Liberation Mono', monospace;

  --max-width: 1200px;
  --header-height: 64px;
}

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

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

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

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

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

code, pre {
  font-family: var(--font-mono);
}

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

/* ----- Navbar ----- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  transition: all var(--transition);
}

.navbar.scrolled {
  background: rgba(15, 23, 42, 0.95);
  box-shadow: 0 1px 3px rgba(0,0,0,0.3);
}

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

.navbar-brand {
  font-size: 1.35rem;
  font-weight: 700;
  color: #fff !important;
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 10px;
}

.navbar-brand .brand-icon {
  width: 32px;
  height: 32px;
  background: var(--gradient-primary);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
}

.navbar-links {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}

.navbar-links a {
  color: rgba(255,255,255,0.75);
  padding: 8px 16px;
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  font-weight: 500;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.navbar-links a:hover {
  color: #fff;
  background: rgba(255,255,255,0.08);
}

.navbar-links .btn-outline {
  border: 1px solid rgba(255,255,255,0.25);
  padding: 7px 18px;
}

.navbar-links .btn-outline:hover {
  border-color: rgba(255,255,255,0.5);
  background: rgba(255,255,255,0.1);
}

.navbar-links .btn-primary-nav {
  background: var(--gradient-primary);
  color: #fff !important;
  padding: 7px 18px;
  font-weight: 600;
}

.navbar-links .btn-primary-nav:hover {
  box-shadow: 0 0 20px rgba(37,99,235,0.4);
  transform: translateY(-1px);
}

.navbar-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  z-index: 1001;
}

.navbar-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: all var(--transition-fast);
}

.navbar-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.navbar-toggle.active span:nth-child(2) { opacity: 0; }
.navbar-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 768px) {
  .navbar-toggle { display: flex; }

  .navbar-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: rgba(15,23,42,0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 80px 24px 24px;
    gap: 2px;
    transition: right var(--transition);
    border-left: 1px solid rgba(255,255,255,0.06);
  }

  .navbar-links.active { right: 0; }

  .navbar-links a {
    width: 100%;
    padding: 12px 16px;
    font-size: 1rem;
  }
}

/* ----- Hero ----- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: var(--gradient-hero);
  overflow: hidden;
  padding: 120px 0 80px;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% -10%, rgba(37,99,235,0.12) 0%, transparent 60%),
    radial-gradient(ellipse 50% 50% at 80% 50%, rgba(124,58,237,0.08) 0%, transparent 50%),
    radial-gradient(ellipse 50% 50% at 20% 80%, rgba(6,182,212,0.06) 0%, transparent 50%);
  pointer-events: none;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.015) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.015) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 0%, black 20%, transparent 70%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(37,99,235,0.15);
  border: 1px solid rgba(37,99,235,0.3);
  color: #93c5fd;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 28px;
}

.hero-badge .dot {
  width: 8px;
  height: 8px;
  background: #22c55e;
  border-radius: 50%;
  animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; box-shadow: 0 0 0 0 rgba(34,197,94,0.6); }
  50% { opacity: 0.8; box-shadow: 0 0 0 8px rgba(34,197,94,0); }
}

.hero h1 {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 800;
  color: #fff;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
}

.hero h1 .gradient-text {
  background: linear-gradient(135deg, #60a5fa 0%, #a78bfa 50%, #22d3ee 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: rgba(255,255,255,0.6);
  max-width: 560px;
  margin: 0 auto 40px;
  line-height: 1.7;
}

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

/* ----- Buttons ----- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-full);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
  white-space: nowrap;
  text-decoration: none;
}

.btn-primary {
  background: var(--gradient-primary);
  color: #fff !important;
  box-shadow: 0 4px 15px rgba(37,99,235,0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(37,99,235,0.45);
}

.btn-outline {
  background: transparent;
  border: 1.5px solid rgba(255,255,255,0.25);
  color: #fff !important;
}

.btn-outline:hover {
  background: rgba(255,255,255,0.06);
  border-color: rgba(255,255,255,0.5);
}

.btn-lg {
  padding: 15px 36px;
  font-size: 1.05rem;
}

.btn-accent {
  background: var(--gradient-accent);
  color: #fff !important;
  box-shadow: 0 4px 15px rgba(6,182,212,0.3);
}

/* ----- Stats Row ----- */
.hero-stats {
  display: flex;
  gap: 48px;
  justify-content: center;
  margin-top: 56px;
  flex-wrap: wrap;
}

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

.hero-stat-value {
  font-size: 2rem;
  font-weight: 800;
  color: #fff;
  letter-spacing: -0.02em;
}

.hero-stat-label {
  font-size: 0.8rem;
  color: rgba(255,255,255,0.45);
  margin-top: 4px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ----- Sections ----- */
.section {
  padding: 100px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-label {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-primary);
  background: rgba(37,99,235,0.08);
  padding: 5px 14px;
  border-radius: var(--radius-full);
  margin-bottom: 16px;
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--color-text);
  margin-bottom: 12px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--color-text-secondary);
  max-width: 560px;
  margin: 0 auto;
}

/* ----- Channel Grid ----- */
.channel-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: stretch;
  gap: 16px;
  max-width: 980px;
  margin: 0 auto;
  padding: 0;
}

.channel-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px 16px;
  text-align: center;
  cursor: default;
  transition: all var(--transition);
  width: 148px;
  flex: 0 0 148px;
  box-sizing: border-box;
}

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

.channel-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 10px;
  font-size: 1.5rem;
  font-weight: 700;
  color: #fff;
}

.channel-name {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text);
}

/* ----- Feature Cards ----- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.feature-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity var(--transition);
}

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

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

.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 1.4rem;
}

.feature-icon.blue { background: rgba(37,99,235,0.1); color: #2563eb; }
.feature-icon.teal { background: rgba(6,182,212,0.1); color: #06b6d4; }
.feature-icon.green { background: rgba(16,185,129,0.1); color: #10b981; }
.feature-icon.purple { background: rgba(124,58,237,0.1); color: #7c3aed; }
.feature-icon.amber { background: rgba(245,158,11,0.1); color: #f59e0b; }
.feature-icon.rose { background: rgba(239,68,68,0.1); color: #ef4444; }
.feature-icon.cyan { background: rgba(6,182,212,0.1); color: #0891b2; }
.feature-icon.indigo { background: rgba(99,102,241,0.1); color: #6366f1; }

.feature-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--color-text);
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.65;
}

/* ----- Stats Section ----- */
.stats-section {
  background: var(--gradient-hero);
  position: relative;
  overflow: hidden;
}

.stats-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle at 30% 50%, rgba(37,99,235,0.08) 0%, transparent 50%),
                    radial-gradient(circle at 70% 50%, rgba(6,182,212,0.06) 0%, transparent 50%);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 32px;
  position: relative;
  z-index: 1;
}

.stat-card {
  text-align: center;
  padding: 32px 20px;
  border-radius: var(--radius-lg);
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.06);
  transition: all var(--transition);
}

.stat-card:hover {
  background: rgba(255,255,255,0.06);
  border-color: rgba(255,255,255,0.12);
}

.stat-value {
  font-size: 2.5rem;
  font-weight: 800;
  background: linear-gradient(135deg, #60a5fa, #a78bfa);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.stat-label {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.5);
  margin-top: 8px;
  font-weight: 500;
}

/* ----- Steps ----- */
.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
}

.step-card {
  text-align: center;
  padding: 36px 24px;
  position: relative;
}

.step-number {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--gradient-primary);
  color: #fff;
  font-size: 1.3rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  box-shadow: 0 8px 25px rgba(37,99,235,0.3);
}

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

.step-card p {
  font-size: 0.88rem;
  color: var(--color-text-secondary);
}

.step-connector {
  display: none;
}

@media (min-width: 769px) {
  .step-card {
    position: relative;
  }
  .step-card:not(:last-child)::after {
    content: '';
    position: absolute;
    top: 64px;
    right: -20px;
    width: 40px;
    height: 2px;
    background: var(--color-border);
    border-radius: 2px;
  }
}

/* ----- CTA Section ----- */
.cta-section {
  background: var(--gradient-hero);
  position: relative;
  overflow: hidden;
  text-align: center;
}

.cta-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 50% 50% at 50% 0%, rgba(37,99,235,0.15) 0%, transparent 60%),
    radial-gradient(ellipse 50% 50% at 50% 100%, rgba(124,58,237,0.1) 0%, transparent 60%);
}

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

.cta-content h2 {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 800;
  color: #fff;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.cta-content p {
  color: rgba(255,255,255,0.6);
  font-size: 1.05rem;
  margin-bottom: 36px;
}

/* ----- Footer ----- */
.footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 48px 0 32px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 40px;
}

@media (max-width: 768px) {
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
}

.footer-brand {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 12px;
}

.footer-desc {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  max-width: 320px;
}

.footer h4 {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
  margin-bottom: 16px;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  border-top: 1px solid var(--color-border-light);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* ----- Page Header (non-index pages) ----- */
.page-header {
  background: var(--gradient-hero);
  padding: 100px 0 56px;
  text-align: center;
}

.page-header h1 {
  font-size: 2rem;
  font-weight: 800;
  color: #fff;
  letter-spacing: -0.02em;
}

.page-header .breadcrumb {
  display: flex;
  gap: 8px;
  justify-content: center;
  margin-top: 12px;
  list-style: none;
  font-size: 0.88rem;
  color: rgba(255,255,255,0.5);
}

.page-header .breadcrumb a {
  color: rgba(255,255,255,0.6);
}

.page-header .breadcrumb a:hover { color: #fff; }

.page-header .breadcrumb .sep { color: rgba(255,255,255,0.3); }

/* ----- Content Area ----- */
.content-area {
  padding: 56px 0;
}

.content-area .container {
  max-width: 860px;
}

/* ----- Agreement Content ----- */
.agreement-content {
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--color-text);
}

.agreement-content h4 {
  font-size: 1.1rem;
  font-weight: 700;
  margin: 32px 0 12px;
  color: var(--color-text);
}

.agreement-content p {
  margin-bottom: 12px;
}

.agreement-content strong {
  color: var(--color-text);
}

/* ----- Doc Layout ----- */
.doc-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 48px;
  align-items: start;
}

@media (max-width: 768px) {
  .doc-layout { grid-template-columns: 1fr; }
}

.doc-sidebar {
  position: sticky;
  top: 88px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
}

.doc-sidebar ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.doc-sidebar a {
  display: block;
  padding: 8px 12px;
  font-size: 0.88rem;
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.doc-sidebar a:hover {
  background: var(--color-surface-hover);
  color: var(--color-text);
}

.doc-sidebar hr {
  margin: 12px 0;
  border: none;
  border-top: 1px solid var(--color-border-light);
}

.doc-content {
  min-width: 0;
}

.doc-content h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin: 40px 0 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-border-light);
}

.doc-content h3:first-child { margin-top: 0; }

.doc-content p {
  margin-bottom: 12px;
  font-size: 0.93rem;
  color: var(--color-text-secondary);
  line-height: 1.75;
}

.doc-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0 28px;
  font-size: 0.88rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}

.doc-content th {
  background: var(--color-surface-hover);
  padding: 10px 14px;
  text-align: left;
  font-weight: 700;
  font-size: 0.82rem;
  color: var(--color-text);
  border-bottom: 2px solid var(--color-border);
}

.doc-content td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--color-border-light);
  color: var(--color-text-secondary);
}

.doc-content tr:last-child td { border-bottom: none; }

.doc-content code {
  background: var(--color-surface-hover);
  padding: 2px 7px;
  border-radius: 4px;
  font-size: 0.85em;
  color: #e11d48;
}

.doc-content pre {
  background: var(--color-surface-hover);
  padding: 16px;
  border-radius: var(--radius);
  overflow-x: auto;
  font-size: 0.85rem;
  line-height: 1.7;
  margin: 16px 0;
}

.doc-content pre code {
  background: none;
  padding: 0;
  color: var(--color-text);
}

.doc-content blockquote {
  background: rgba(245,158,11,0.06);
  border-left: 3px solid var(--color-warning);
  padding: 14px 18px;
  margin: 20px 0;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 0.9rem;
  color: var(--color-text-secondary);
}

/* ----- Pay Result Pages ----- */
.pay-result {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg);
  padding: 24px;
}

.pay-result-card {
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  padding: 56px 40px 40px;
  text-align: center;
  max-width: 380px;
  width: 100%;
  box-shadow: var(--shadow-xl);
}

.pay-icon {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 24px;
  font-size: 2rem;
  animation: scale-in 0.4s ease;
}

@keyframes scale-in {
  0% { transform: scale(0); opacity: 0; }
  60% { transform: scale(1.1); }
  100% { transform: scale(1); opacity: 1; }
}

.pay-icon.success {
  background: rgba(16,185,129,0.1);
  color: #10b981;
}

.pay-icon.error {
  background: rgba(239,68,68,0.1);
  color: #ef4444;
}

.pay-icon svg {
  width: 36px;
  height: 36px;
}

.pay-result-card h2 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.pay-result-card .pay-msg {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  margin-bottom: 32px;
}

.pay-result-card .btn {
  width: 100%;
  justify-content: center;
  margin-bottom: 10px;
}

/* ----- WX Tutorial Page ----- */
.wx-tutorial {
  max-width: 740px;
  margin: 0 auto;
  font-size: 0.95rem;
  line-height: 1.8;
}

.wx-tutorial h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.wx-tutorial img {
  border-radius: var(--radius);
  margin: 16px 0;
}

.wx-tutorial .back-btn {
  display: block;
  width: 100%;
  margin-top: 24px;
}

/* ----- Mobile Nav Overlay ----- */
.nav-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 999;
}

.nav-overlay.active { display: block; }

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

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

/* ----- Dark Mode ----- */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #0b1120;
    --color-surface: #131c31;
    --color-surface-hover: #1a2744;
    --color-text: #e2e8f0;
    --color-text-secondary: #94a3b8;
    --color-text-muted: #64748b;
    --color-border: #1e2d4a;
    --color-border-light: #18243e;
  }

  .navbar {
    background: rgba(11,17,32,0.85);
    border-bottom-color: rgba(255,255,255,0.04);
  }

  .navbar.scrolled {
    background: rgba(11,17,32,0.95);
  }

  .channel-card { background: var(--color-surface); }
  .feature-card { background: var(--color-surface); }

  .doc-content code {
    background: rgba(255,255,255,0.06);
    color: #fb7185;
  }
}

/* ----- Utility ----- */
.text-center { text-align: center; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }