/* ═══════════════════════════════════════════════════════════════
   Global — 全站共用基底
   ═══════════════════════════════════════════════════════════════ */

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

/* ── Design Tokens ── */
:root {
  --bg: #06080f;
  --surface: rgba(255, 255, 255, 0.035);
  --border: rgba(255, 255, 255, 0.07);
  --text: #d4dae6;
  --text2: rgba(255, 255, 255, 0.45);
  --text3: rgba(255, 255, 255, 0.25);
  --accent: #60a5fa;
  --accent2: #38bdf8;
  --green: #34d399;
  --red: #fb7185;
  --amber: #fbbf24;
  --font: 'Noto Sans TC', 'SF Pro Display', system-ui, sans-serif;
  --mono: 'JetBrains Mono', monospace;
}

/* ── Base ── */
html { font-size: 16px; }

body {
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  min-height: 100vh;
  overflow-x: hidden;
}
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background: radial-gradient(
    ellipse 80% 50% at 50% -20%,
    rgba(56, 189, 248, 0.06),
    transparent 70%
  );
  pointer-events: none;
  z-index: 0;
}

/* ── Shared Buttons ── */
.btn-primary {
  padding: 14px 44px;
  font-size: 15px;
  font-weight: 700;
  font-family: var(--font);
  border: none;
  border-radius: 12px;
  background: linear-gradient(135deg, #1d4ed8, #2563eb);
  color: #fff;
  cursor: pointer;
  box-shadow: 0 4px 24px rgba(37, 99, 235, 0.35);
  transition: transform 0.12s, box-shadow 0.12s;
}
.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 28px rgba(37, 99, 235, 0.45);
}

.btn-secondary {
  padding: 13px 32px;
  font-size: 14px;
  font-weight: 600;
  font-family: var(--font);
  border: 1px solid var(--border);
  border-radius: 11px;
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  transition: background 0.15s;
}
.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.07);
}

/* ── Back Link ── */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text3);
  text-decoration: none;
  margin-bottom: 20px;
  transition: color 0.15s;
}
.back-link:hover { color: var(--accent); }

/* ── Animation ── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}