/* ============================================================
   1hcrypto — Design System v1.0
   加密货币财经资讯 & 模拟交易站
   Production-ready CSS Framework for Cloudflare Workers
   ============================================================ */

/* --- CSS Custom Properties --- */
:root {
  /* Brand Colors */
  --color-bg-primary: #0a0e14;
  --color-bg-secondary: #11161e;
  --color-bg-tertiary: #161c26;
  --color-bg-card: #141a24;
  --color-bg-card-hover: #1a2130;
  --color-bg-elevated: #1c2330;
  --color-bg-input: #0d1117;

  /* Accent */
  --color-accent: #d4a853;
  --color-accent-glow: rgba(212, 168, 83, 0.15);
  --color-accent-hover: #e0b963;
  --color-accent-muted: rgba(212, 168, 83, 0.08);

  /* Semantic */
  --color-positive: #34d399;
  --color-positive-bg: rgba(52, 211, 153, 0.08);
  --color-negative: #f87171;
  --color-negative-bg: rgba(248, 113, 113, 0.08);
  --color-warning: #fbbf24;
  --color-warning-bg: rgba(251, 191, 36, 0.08);
  --color-info: #60a5fa;
  --color-info-bg: rgba(96, 165, 250, 0.08);

  /* Text */
  --color-text-primary: #e6edf3;
  --color-text-secondary: #8b949e;
  --color-text-tertiary: #5c6570;
  --color-text-inverse: #0a0e14;
  --color-text-accent: #d4a853;

  /* Borders */
  --color-border-default: #21262d;
  --color-border-subtle: #1a1f2b;
  --color-border-accent: rgba(212, 168, 83, 0.25);

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', 'Consolas', monospace;
  --font-display: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Font Sizes */
  --text-xs: 0.75rem;     /* 12px */
  --text-sm: 0.8125rem;   /* 13px */
  --text-base: 0.9375rem; /* 15px */
  --text-lg: 1.0625rem;   /* 17px */
  --text-xl: 1.25rem;     /* 20px */
  --text-2xl: 1.5rem;     /* 24px */
  --text-3xl: 1.875rem;   /* 30px */
  --text-4xl: 2.5rem;     /* 40px */
  --text-5xl: 3.25rem;    /* 52px */

  /* Spacing */
  --space-1: 0.25rem;  --space-2: 0.5rem;   --space-3: 0.75rem;
  --space-4: 1rem;     --space-5: 1.25rem;   --space-6: 1.5rem;
  --space-8: 2rem;     --space-10: 2.5rem;   --space-12: 3rem;
  --space-16: 4rem;    --space-20: 5rem;     --space-24: 6rem;

  /* Layout */
  --max-width: 1280px;
  --sidebar-width: 260px;
  --header-height: 60px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 20px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
  --shadow-glow-accent: 0 0 40px rgba(212, 168, 83, 0.08);
  --shadow-glow-positive: 0 0 20px rgba(52, 211, 153, 0.06);

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Z-index */
  --z-header: 100;
  --z-overlay: 200;
  --z-modal: 300;
  --z-toast: 400;
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-text-primary);
  background: var(--color-bg-primary);
  min-height: 100vh;
  overflow-x: hidden;
}

/* Subtle noise texture overlay */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.015'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 0;
}

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

img { max-width: 100%; display: block; }
button { cursor: pointer; font-family: inherit; }
input, select, textarea { font-family: inherit; }

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
}

h1 { font-size: var(--text-5xl); font-weight: 700; letter-spacing: -0.03em; }
h2 { font-size: var(--text-3xl); }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl); }

.text-mono { font-family: var(--font-mono); }
.text-accent { color: var(--color-accent); }
.text-positive { color: var(--color-positive); }
.text-negative { color: var(--color-negative); }
.text-secondary { color: var(--color-text-secondary); }
.text-tertiary { color: var(--color-text-tertiary); }
.text-sm { font-size: var(--text-sm); }
.text-xs { font-size: var(--text-xs); }
.text-lg { font-size: var(--text-lg); }
.text-right { text-align: right; }
.text-center { text-align: center; }

/* --- Layout --- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.section {
  padding: var(--space-16) 0;
}

.section-header {
  margin-bottom: var(--space-8);
}

.section-header h2 {
  margin-bottom: var(--space-2);
}

.section-header p {
  color: var(--color-text-secondary);
  max-width: 640px;
}

.grid { display: grid; gap: var(--space-6); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.gap-2 { gap: var(--space-2); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

/* --- Header / Navigation --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  height: var(--header-height);
  background: rgba(10, 14, 20, 0.82);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--color-border-default);
}

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

.header-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-weight: 700;
  font-size: var(--text-lg);
  letter-spacing: -0.01em;
  color: var(--color-text-primary);
  text-decoration: none;
}

.header-brand .brand-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--color-accent), #b8902e);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 800;
  color: #0a0e14;
  flex-shrink: 0;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.header-nav a {
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
  white-space: nowrap;
}

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

.header-nav a.active {
  color: var(--color-accent);
  background: var(--color-accent-muted);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

/* Language Switcher */
.lang-switch {
  display: flex;
  align-items: center;
  gap: 2px;
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-sm);
  padding: 2px;
  border: 1px solid var(--color-border-default);
}

.lang-switch button {
  padding: 4px 10px;
  border: none;
  background: transparent;
  color: var(--color-text-secondary);
  font-size: var(--text-xs);
  font-weight: 500;
  border-radius: 4px;
  transition: all var(--transition-fast);
  cursor: pointer;
  white-space: nowrap;
}

.lang-switch button.active {
  background: var(--color-accent);
  color: var(--color-text-inverse);
}

.lang-switch button:hover:not(.active) {
  color: var(--color-text-primary);
  background: var(--color-bg-card-hover);
}

/* Mobile hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 4px;
  padding: 8px;
  background: none;
  border: none;
  cursor: pointer;
}

.hamburger span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-text-primary);
  border-radius: 1px;
  transition: all var(--transition-fast);
}

/* --- Cards --- */
.card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: all var(--transition-base);
}

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

.card-glow {
  box-shadow: var(--shadow-glow-accent);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-4);
}

.card-title {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* --- Metric Cards --- */
.metric-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-4);
}

.metric-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-md);
  padding: var(--space-5);
  transition: all var(--transition-base);
}

.metric-card:hover {
  background: var(--color-bg-card-hover);
  border-color: var(--color-border-accent);
}

.metric-card .metric-label {
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--space-1);
}

.metric-card .metric-value {
  font-family: var(--font-mono);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-text-primary);
  letter-spacing: -0.02em;
}

.metric-card .metric-change {
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  margin-top: var(--space-1);
}

.metric-card .metric-sub {
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  margin-top: var(--space-1);
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 10px 20px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  font-weight: 600;
  line-height: 1;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
  letter-spacing: -0.01em;
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-text-inverse);
}

.btn-primary:hover {
  background: var(--color-accent-hover);
  box-shadow: 0 0 20px var(--color-accent-glow);
}

.btn-secondary {
  background: var(--color-bg-tertiary);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border-default);
}

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

.btn-outline {
  background: transparent;
  color: var(--color-accent);
  border: 1px solid var(--color-border-accent);
}

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

.btn-ghost {
  background: transparent;
  color: var(--color-text-secondary);
}

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

.btn-sm { padding: 6px 14px; font-size: var(--text-xs); }
.btn-lg { padding: 14px 28px; font-size: var(--text-base); }

/* --- Tags / Badges --- */
.tag {
  display: inline-flex;
  align-items: center;
  padding: 2px 10px;
  border-radius: 20px;
  font-size: var(--text-xs);
  font-weight: 500;
  white-space: nowrap;
}

.tag-accent {
  background: var(--color-accent-muted);
  color: var(--color-accent);
  border: 1px solid rgba(212, 168, 83, 0.2);
}

.tag-positive {
  background: var(--color-positive-bg);
  color: var(--color-positive);
}

.tag-negative {
  background: var(--color-negative-bg);
  color: var(--color-negative);
}

.tag-neutral {
  background: var(--color-bg-tertiary);
  color: var(--color-text-secondary);
}

.tag-info {
  background: var(--color-info-bg);
  color: var(--color-info);
}

/* --- Divider --- */
.divider {
  height: 1px;
  background: var(--color-border-default);
  border: none;
  margin: 0;
}

.divider-subtle {
  background: var(--color-border-subtle);
}

/* --- Skeleton Loading --- */
.skeleton {
  background: linear-gradient(90deg, var(--color-bg-tertiary) 25%, var(--color-bg-card-hover) 50%, var(--color-bg-tertiary) 75%);
  background-size: 200% 100%;
  animation: skeleton-shimmer 1.5s ease-in-out infinite;
  border-radius: var(--radius-sm);
}

@keyframes skeleton-shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* --- News Item --- */
.news-item {
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--color-border-subtle);
  transition: all var(--transition-fast);
}

.news-item:last-child { border-bottom: none; }

.news-item:hover {
  background: var(--color-bg-card-hover);
  margin: 0 calc(-1 * var(--space-4));
  padding-left: var(--space-4);
  padding-right: var(--space-4);
  border-radius: var(--radius-sm);
}

.news-item .news-meta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-1);
}

.news-item .news-title {
  font-weight: 600;
  font-size: var(--text-base);
  margin-bottom: var(--space-1);
  line-height: 1.4;
}

.news-item .news-title a {
  color: var(--color-text-primary);
}

.news-item .news-title a:hover {
  color: var(--color-accent);
}

.news-item .news-excerpt {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.5;
}

/* --- Table --- */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

.data-table th {
  text-align: left;
  padding: var(--space-3) var(--space-4);
  font-weight: 500;
  color: var(--color-text-tertiary);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  border-bottom: 1px solid var(--color-border-default);
}

.data-table td {
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-border-subtle);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
}

.data-table tr:hover td {
  background: var(--color-bg-card-hover);
}

/* --- Chart Container --- */
.chart-container {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
}

.chart-container .chart-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-4);
}

/* --- Hero Section --- */
.hero {
  position: relative;
  padding: var(--space-20) 0 var(--space-16);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -30%;
  width: 160%;
  height: 200%;
  background: radial-gradient(ellipse at 30% 50%, rgba(212, 168, 83, 0.04) 0%, transparent 60%),
              radial-gradient(ellipse at 70% 30%, rgba(96, 165, 250, 0.03) 0%, transparent 50%);
  pointer-events: none;
}

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

.hero h1 {
  margin-bottom: var(--space-4);
}

.hero h1 .highlight {
  background: linear-gradient(135deg, var(--color-accent), #e8c97a);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  color: var(--color-text-secondary);
  font-size: var(--text-lg);
  margin-bottom: var(--space-8);
  max-width: 560px;
}

.hero-actions {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
}

/* --- Ticker Bar --- */
.ticker-bar {
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border-default);
  border-bottom: 1px solid var(--color-border-default);
  padding: var(--space-3) 0;
  overflow: hidden;
  position: relative;
}

.ticker-track {
  display: flex;
  gap: var(--space-8);
  animation: ticker-scroll 30s linear infinite;
  white-space: nowrap;
}

@keyframes ticker-scroll {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

.ticker-item {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
}

.ticker-item .ticker-symbol {
  color: var(--color-text-primary);
  font-weight: 600;
}

.ticker-item .ticker-price {
  color: var(--color-text-secondary);
}

.ticker-item .ticker-change.positive { color: var(--color-positive); }
.ticker-item .ticker-change.negative { color: var(--color-negative); }

/* --- Analysis Block --- */
.analysis-content {
  line-height: 1.8;
  color: var(--color-text-secondary);
  font-size: var(--text-base);
}

.analysis-content h3 {
  color: var(--color-text-primary);
  margin: var(--space-6) 0 var(--space-3);
  font-size: var(--text-lg);
}

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

.analysis-content p {
  margin-bottom: var(--space-4);
}

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

.analysis-content .key-level {
  display: inline-block;
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-sm);
  padding: 4px 12px;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-primary);
}

.analysis-content .key-level.support {
  border-color: rgba(52, 211, 153, 0.3);
  color: var(--color-positive);
}

.analysis-content .key-level.resistance {
  border-color: rgba(248, 113, 113, 0.3);
  color: var(--color-negative);
}

/* --- Disclaimer --- */
.disclaimer {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-4);
}

.disclaimer-icon {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-warning);
  margin-bottom: var(--space-2);
}

.disclaimer p {
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  line-height: 1.6;
}

/* --- Footer --- */
.site-footer {
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border-default);
  padding: var(--space-12) 0 var(--space-8);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-8);
  margin-bottom: var(--space-8);
}

.footer-brand p {
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
  margin-top: var(--space-3);
  max-width: 300px;
}

.footer-links h4 {
  font-size: var(--text-sm);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-4);
}

.footer-links a {
  display: block;
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
  padding: var(--space-1) 0;
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border-subtle);
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
}

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

/* --- Breadcrumb --- */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
  margin-bottom: var(--space-6);
}

.breadcrumb a { color: var(--color-text-secondary); }
.breadcrumb a:hover { color: var(--color-accent); }
.breadcrumb .separator { color: var(--color-text-tertiary); }

/* --- Search --- */
.search-box {
  position: relative;
}

.search-box input {
  width: 100%;
  padding: 10px 16px 10px 42px;
  background: var(--color-bg-input);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-sm);
  color: var(--color-text-primary);
  font-size: var(--text-sm);
  transition: all var(--transition-fast);
}

.search-box input::placeholder {
  color: var(--color-text-tertiary);
}

.search-box input:focus {
  outline: none;
  border-color: var(--color-border-accent);
  box-shadow: 0 0 0 3px var(--color-accent-muted);
}

.search-box .search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-tertiary);
  font-size: var(--text-base);
  pointer-events: none;
}

/* --- Pagination --- */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  margin-top: var(--space-8);
}

.pagination button {
  padding: 8px 14px;
  border: 1px solid var(--color-border-default);
  background: var(--color-bg-card);
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.pagination button:hover {
  background: var(--color-bg-card-hover);
  border-color: var(--color-border-accent);
  color: var(--color-text-primary);
}

.pagination button.active {
  background: var(--color-accent);
  color: var(--color-text-inverse);
  border-color: var(--color-accent);
}

/* --- Tab Navigation --- */
.tab-nav {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--color-border-default);
  margin-bottom: var(--space-6);
}

.tab-nav button {
  padding: var(--space-3) var(--space-5);
  border: none;
  background: transparent;
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  font-weight: 500;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: all var(--transition-fast);
}

.tab-nav button:hover {
  color: var(--color-text-primary);
}

.tab-nav button.active {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

/* --- Feature Grid (for referral page) --- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-6);
}

.feature-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  text-align: center;
  transition: all var(--transition-base);
}

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

.feature-card .feature-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: var(--color-accent-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-4);
  font-size: 1.5rem;
}

.feature-card h3 {
  margin-bottom: var(--space-3);
  font-size: var(--text-lg);
}

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

/* --- Step List (Knowledge Base) --- */
.step-list {
  counter-reset: step;
}

.step-item {
  counter-increment: step;
  display: flex;
  gap: var(--space-5);
  padding: var(--space-6) 0;
  border-bottom: 1px solid var(--color-border-subtle);
}

.step-item:last-child { border-bottom: none; }

.step-item .step-number {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-accent-muted);
  border: 1px solid var(--color-border-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-accent);
}

.step-item h3 {
  font-size: var(--text-base);
  margin-bottom: var(--space-1);
}

.step-item p {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* --- Toast --- */
.toast {
  position: fixed;
  top: calc(var(--header-height) + var(--space-4));
  right: var(--space-6);
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-md);
  padding: var(--space-4) var(--space-6);
  box-shadow: var(--shadow-lg);
  z-index: var(--z-toast);
  font-size: var(--text-sm);
  animation: toast-in 0.3s ease-out;
  pointer-events: all;
}

@keyframes toast-in {
  from { opacity: 0; transform: translateX(20px); }
  to { opacity: 1; transform: translateX(0); }
}

/* --- Knowledge Base Article --- */
.kb-article {
  max-width: 780px;
  margin: 0 auto;
  line-height: 1.8;
  color: var(--color-text-secondary);
}

.kb-article h2 {
  color: var(--color-text-primary);
  margin: var(--space-8) 0 var(--space-3);
}

.kb-article h3 {
  color: var(--color-text-primary);
  margin: var(--space-6) 0 var(--space-2);
}

.kb-article p {
  margin-bottom: var(--space-4);
}

.kb-article ul, .kb-article ol {
  margin-bottom: var(--space-4);
  padding-left: var(--space-6);
}

.kb-article li {
  margin-bottom: var(--space-2);
}

.kb-article .info-box {
  background: var(--color-info-bg);
  border: 1px solid rgba(96, 165, 250, 0.2);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  margin: var(--space-6) 0;
  font-size: var(--text-sm);
}

.kb-article .info-box strong {
  color: var(--color-info);
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  :root {
    --text-5xl: 2.25rem;
    --text-4xl: 1.75rem;
    --text-3xl: 1.5rem;
    --text-2xl: 1.25rem;
    --header-height: 54px;
  }

  .header-nav { display: none; }
  .header-nav.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: rgba(10, 14, 20, 0.98);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border-default);
    padding: var(--space-4);
    gap: var(--space-1);
  }

  .hamburger { display: flex; }

  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: var(--space-3); text-align: center; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .metric-grid { grid-template-columns: repeat(2, 1fr); }
  .hero { padding: var(--space-12) 0 var(--space-10); }
  .section { padding: var(--space-10) 0; }
  .container { padding: 0 var(--space-4); }
}

@media (max-width: 480px) {
  .metric-grid { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; }
}

/* ============================================================
   SPECTACULAR UI ENHANCEMENTS — 炫酷视觉层
   ============================================================ */

/* --- Glassmorphism Cards --- */
.glass-card {
  background: rgba(20, 26, 36, 0.65);
  backdrop-filter: blur(24px) saturate(140%);
  -webkit-backdrop-filter: blur(24px) saturate(140%);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
}

.glass-card:hover {
  background: rgba(26, 33, 48, 0.8);
  border-color: rgba(212, 168, 83, 0.2);
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.5), 0 0 60px rgba(212, 168, 83, 0.04);
}

/* --- Animated Gradient Border --- */
.gradient-border {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.gradient-border::before {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  background: linear-gradient(135deg, var(--color-accent), transparent 40%, transparent 60%, var(--color-accent));
  z-index: -1;
  animation: border-rotate 4s linear infinite;
  opacity: 0;
  transition: opacity var(--transition-base);
}

.gradient-border:hover::before { opacity: 1; }

@keyframes border-rotate {
  0% { filter: hue-rotate(0deg); }
  100% { filter: hue-rotate(360deg); }
}

/* --- Glow Pulse --- */
.glow-pulse {
  animation: glow-pulse 3s ease-in-out infinite;
}

@keyframes glow-pulse {
  0%, 100% { box-shadow: 0 0 20px rgba(212, 168, 83, 0.08); }
  50% { box-shadow: 0 0 40px rgba(212, 168, 83, 0.2); }
}

/* --- Floating Animation --- */
.float {
  animation: float 6s ease-in-out infinite;
}

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

/* --- Shimmer Text --- */
.shimmer-text {
  background: linear-gradient(90deg, var(--color-accent) 0%, #f0d78c 50%, var(--color-accent) 100%);
  background-size: 200% auto;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: shimmer 3s linear infinite;
}

@keyframes shimmer {
  to { background-position: 200% center; }
}

/* --- Code Box (for referral codes) --- */
.code-box {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  background: var(--color-bg-input);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-sm);
  padding: var(--space-2) var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  transition: all var(--transition-fast);
  position: relative;
}

.code-box:hover {
  border-color: var(--color-border-accent);
}

.code-box .code-text {
  flex: 1;
  color: var(--color-accent);
  font-weight: 600;
  letter-spacing: 0.04em;
  user-select: all;
  cursor: text;
}

.code-box .copy-btn {
  flex-shrink: 0;
  padding: 6px 12px;
  border: none;
  background: var(--color-bg-tertiary);
  color: var(--color-text-secondary);
  font-size: var(--text-xs);
  font-weight: 600;
  border-radius: 4px;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.code-box .copy-btn:hover {
  background: var(--color-accent-muted);
  color: var(--color-accent);
}

.code-box .copy-btn.copied {
  background: var(--color-positive-bg);
  color: var(--color-positive);
}

/* --- Exchange Grid (larger for classified layout) --- */
.exchange-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
  gap: var(--space-6);
}

.exchange-grid.tight {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

/* --- Category Section Title --- */
.category-title {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-5);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--color-border-subtle);
}

.category-title .cat-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
}

.category-title .cat-icon.exchange { background: var(--color-accent-muted); }
.category-title .cat-icon.tools { background: var(--color-info-bg); }
.category-title .cat-icon.hardware { background: var(--color-positive-bg); }

.category-title h3 {
  font-size: var(--text-lg);
  font-weight: 700;
}

.category-title .cat-count {
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  font-family: var(--font-mono);
}

/* --- Enhanced Exchange Card --- */
.exchange-card-v2 {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  position: relative;
  transition: all var(--transition-base);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.exchange-card-v2:hover {
  background: var(--color-bg-card-hover);
  border-color: var(--color-border-accent);
  box-shadow: 0 12px 48px rgba(0, 0, 0, 0.6), 0 0 80px rgba(212, 168, 83, 0.06);
  transform: translateY(-3px);
}

.exchange-card-v2.featured {
  border-color: var(--color-border-accent);
  box-shadow: 0 0 60px rgba(212, 168, 83, 0.06);
}

.exchange-card-v2 .ec-header {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
}

.exchange-card-v2 .ec-logo {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  font-weight: 800;
  flex-shrink: 0;
  position: relative;
  overflow: hidden;
}

.exchange-card-v2 .ec-logo::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.12), transparent);
  pointer-events: none;
}

.exchange-card-v2 .ec-name-area { flex: 1; min-width: 0; }

.exchange-card-v2 .ec-name {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: 2px;
}

.exchange-card-v2 .ec-subtitle {
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
}

.exchange-card-v2 .ec-badge {
  position: absolute;
  top: 0;
  right: var(--space-5);
  transform: translateY(-50%);
  background: linear-gradient(135deg, var(--color-accent), #c99530);
  color: var(--color-text-inverse);
  font-size: 11px;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: 20px;
  letter-spacing: 0.02em;
}

.exchange-card-v2 .ec-desc {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.exchange-card-v2 .ec-features {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.exchange-card-v2 .ec-feature-pill {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: var(--text-xs);
  background: var(--color-bg-tertiary);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border-subtle);
}

.exchange-card-v2 .ec-codes {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.exchange-card-v2 .ec-codes .code-row {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-xs);
}

.exchange-card-v2 .ec-codes .code-row .code-label {
  color: var(--color-text-tertiary);
  flex-shrink: 0;
  min-width: 60px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-size: 10px;
}

.exchange-card-v2 .ec-codes .code-row .code-value {
  flex: 1;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-accent);
  font-weight: 600;
  background: var(--color-bg-input);
  border: 1px solid var(--color-border-subtle);
  border-radius: 4px;
  padding: 6px 10px;
  cursor: text;
  user-select: all;
  transition: border-color var(--transition-fast);
}

.exchange-card-v2 .ec-codes .code-row .code-value:hover {
  border-color: var(--color-border-accent);
}

.exchange-card-v2 .ec-actions {
  display: flex;
  gap: var(--space-2);
}

.exchange-card-v2 .ec-actions .btn { flex: 1; }

/* --- Toast notification for copy --- */
.copy-toast {
  position: fixed;
  bottom: var(--space-8);
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-accent);
  color: var(--color-text-inverse);
  padding: 10px 24px;
  border-radius: 20px;
  font-size: var(--text-sm);
  font-weight: 600;
  z-index: var(--z-toast);
  animation: copy-toast-in 0.3s ease-out, copy-toast-out 0.3s ease-in 1.7s forwards;
  pointer-events: none;
  white-space: nowrap;
}

@keyframes copy-toast-in {
  from { opacity: 0; transform: translateX(-50%) translateY(12px); }
  to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

@keyframes copy-toast-out {
  from { opacity: 1; transform: translateX(-50%) translateY(0); }
  to { opacity: 0; transform: translateX(-50%) translateY(-8px); }
}

/* --- Stats Counter Row --- */
.stats-row {
  display: flex;
  gap: var(--space-8);
  justify-content: center;
  margin: var(--space-8) 0;
  flex-wrap: wrap;
}

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

.stat-item .stat-num {
  font-family: var(--font-mono);
  font-size: var(--text-3xl);
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-accent), #e8c97a);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-item .stat-label {
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-top: var(--space-1);
}

/* --- Hero particle background --- */
.hero-particles {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.hero-particles .particle {
  position: absolute;
  border-radius: 50%;
  background: var(--color-accent);
  opacity: 0;
  animation: particle-float linear infinite;
}

@keyframes particle-float {
  0% { opacity: 0; transform: translateY(100vh) scale(0); }
  10% { opacity: 0.6; }
  90% { opacity: 0.1; }
  100% { opacity: 0; transform: translateY(-100vh) scale(1.5); }
}

@media (max-width: 768px) {
  .exchange-grid, .exchange-grid.tight { grid-template-columns: 1fr; }
  .stats-row { gap: var(--space-4); }
  .exchange-card-v2 .ec-actions { flex-direction: column; }
}