@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

/* ── CSS 变量（深色默认） ── */
:root {
  --bg: #070d1a;
  --bg-card: rgba(15, 23, 42, 0.7);
  --bg-card-hover: rgba(30, 41, 59, 0.75);
  --bg-code: rgba(0,0,0,0.3);
  --bg-error: rgba(127,29,29,0.3);

  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #475569;
  --text-dim: #334155;
  --text-code: #64748b;

  --border: rgba(255,255,255,0.065);
  --border-hover: rgba(99,102,241,0.35);
  --border-code: rgba(255,255,255,0.05);
  --border-error: rgba(239,68,68,0.25);
  --border-section: rgba(51,65,85,0.6);

  --accent: #6366f1;
  --accent-bg: rgba(99,102,241,0.1);
  --accent-border: rgba(99,102,241,0.25);
  --accent-glow: rgba(99,102,241,0.12);
  --accent-card-before: rgba(99,102,241,0.07);

  --glow-1: rgba(99,102,241,0.13);
  --glow-2: rgba(14,165,233,0.09);

  --btn-bg: rgba(37,99,235,0.75);
  --btn-hover: rgba(59,130,246,0.9);

  --shadow: rgba(0,0,0,0.35);
  --hero-grad-from: #f1f5f9;
  --hero-grad-to: #94a3b8;
}

/* ── 浅色模式 ── */
@media (prefers-color-scheme: light) {
  :root {
    --bg: #f0f4f8;
    --bg-card: rgba(255,255,255,0.75);
    --bg-card-hover: rgba(255,255,255,0.95);
    --bg-code: rgba(0,0,0,0.04);
    --bg-error: rgba(254,226,226,0.6);

    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --text-dim: #cbd5e1;
    --text-code: #64748b;

    --border: rgba(0,0,0,0.08);
    --border-hover: rgba(99,102,241,0.45);
    --border-code: rgba(0,0,0,0.07);
    --border-error: rgba(239,68,68,0.3);
    --border-section: rgba(203,213,225,0.8);

    --accent: #6366f1;
    --accent-bg: rgba(99,102,241,0.08);
    --accent-border: rgba(99,102,241,0.3);
    --accent-glow: rgba(99,102,241,0.1);
    --accent-card-before: rgba(99,102,241,0.05);

    --glow-1: rgba(99,102,241,0.08);
    --glow-2: rgba(14,165,233,0.06);

    --btn-bg: rgba(37,99,235,0.85);
    --btn-hover: rgba(37,99,235,1);

    --shadow: rgba(0,0,0,0.1);
    --hero-grad-from: #1e293b;
    --hero-grad-to: #475569;
  }
}

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

body {
  background: var(--bg);
  color: var(--text-primary);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  transition: background 0.3s ease, color 0.3s ease;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 70% 45% at 15% -5%, var(--glow-1) 0%, transparent 65%),
    radial-gradient(ellipse 55% 40% at 85% 105%, var(--glow-2) 0%, transparent 65%);
  pointer-events: none;
  z-index: 0;
}

.container {
  position: relative;
  z-index: 1;
  max-width: 1020px;
  margin: 0 auto;
  padding: 64px 24px 96px;
}

/* ── Hero ── */
.hero {
  text-align: center;
  margin-bottom: 72px;
}

.hero-badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-bg);
  border: 1px solid var(--accent-border);
  padding: 5px 14px;
  border-radius: 99px;
  margin-bottom: 20px;
}

.hero h1 {
  font-size: 54px;
  font-weight: 700;
  letter-spacing: -2px;
  line-height: 1.1;
  background: linear-gradient(135deg, var(--hero-grad-from) 0%, var(--hero-grad-to) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 12px;
}

.hero-sub {
  color: var(--text-muted);
  font-size: 14px;
  letter-spacing: 0.3px;
}

/* ── Section ── */
.section {
  margin-bottom: 48px;
}

.section-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 1.8px;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 16px;
  padding-left: 1px;
}

.section-title::after {
  content: '';
  flex: 1;
  height: 1px;
  background: linear-gradient(to right, var(--border-section), transparent);
}

/* ── 卡片网格 ── */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
  gap: 11px;
}

.card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 18px 20px;
  border-radius: 14px;
  color: var(--text-secondary);
  font-size: 13.5px;
  font-weight: 500;
  cursor: pointer;
  transition: transform 0.2s ease, background 0.2s ease, border-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
  user-select: none;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--accent-card-before) 0%, transparent 60%);
  opacity: 0;
  transition: opacity 0.2s;
  border-radius: inherit;
}

.card:hover {
  transform: translateY(-3px);
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  color: var(--text-primary);
  box-shadow: 0 12px 32px var(--shadow), 0 0 0 1px var(--accent-glow);
}

.card:hover::before { opacity: 1; }
.card:active { transform: translateY(-1px); }

/* ── Accordion ── */
.accordion {
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.accordion-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: border-color 0.2s;
}

.accordion-item:hover {
  border-color: rgba(99,102,241,0.2);
}

.accordion-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 15px 18px;
  cursor: pointer;
  font-weight: 500;
  font-size: 13.5px;
  color: var(--text-secondary);
  transition: background 0.15s, color 0.15s;
  user-select: none;
}

.accordion-header:hover {
  background: rgba(99,102,241,0.04);
  color: var(--text-primary);
}

.arrow {
  width: 16px;
  flex-shrink: 0;
  font-size: 9px;
  color: var(--text-dim);
  transition: color 0.2s;
}

.accordion-header:hover .arrow {
  color: var(--text-secondary);
}

.accordion-content {
  display: none;
  padding: 0 18px 16px;
  border-top: 1px solid var(--border);
}

.url-box {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-top: 14px;
}

.url-box code {
  display: block;
  padding: 11px 14px;
  border-radius: 10px;
  background: var(--bg-code);
  border: 1px solid var(--border-code);
  word-break: break-all;
  font-size: 12px;
  color: var(--text-code);
  font-family: 'SF Mono', 'Fira Code', 'Fira Mono', monospace;
  line-height: 1.6;
}

.copy-btn {
  align-self: flex-end;
  border: none;
  background: var(--btn-bg);
  color: #fff;
  padding: 7px 16px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 12.5px;
  font-weight: 500;
  font-family: inherit;
  transition: background 0.15s, transform 0.1s;
}

.copy-btn:hover {
  background: var(--btn-hover);
  transform: translateY(-1px);
}

.copy-btn:active { transform: translateY(0); }

/* ── Toast ── */
@keyframes fadeout {
  0%   { opacity: 1; transform: translateX(-50%) translateY(0); }
  65%  { opacity: 1; }
  100% { opacity: 0; transform: translateX(-50%) translateY(8px); }
}

/* ── 错误提示 ── */
.error {
  padding: 18px 20px;
  border-radius: 12px;
  background: var(--bg-error);
  border: 1px solid var(--border-error);
  color: #ef4444;
  font-size: 13.5px;
}

/* ── 响应式 ── */
@media (max-width: 640px) {
  .hero h1 { font-size: 38px; letter-spacing: -1px; }
  .grid { grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 9px; }
  .container { padding: 44px 16px 64px; }
}