@import url('https://fonts.googleapis.com/css2?family=Syne:wght@400;600;700;800&family=Space+Mono:wght@400;700&family=Noto+Sans+TC:wght@300;400;500;700&display=swap');

/* ── 設計系統 ── */
:root {
  --bg:        #090d13;
  --bg2:       #0e1520;
  --bg3:       #131d2b;
  --border:    rgba(56, 189, 248, 0.12);
  --border2:   rgba(56, 189, 248, 0.25);
  --sky:       #38bdf8;
  --sky-dim:   rgba(56, 189, 248, 0.15);
  --sky-glow:  rgba(56, 189, 248, 0.08);
  --amber:     #f59e0b;
  --red:       #f43f5e;
  --green:     #34d399;
  --text:      #e2e8f0;
  --text-dim:  #64748b;
  --text-mid:  #94a3b8;
  --font-head: 'Syne', 'Noto Sans TC', sans-serif;
  --font-mono: 'Space Mono', monospace;
  --font-body: 'Noto Sans TC', sans-serif;
  --radius:    10px;
  --trans:     0.22s cubic-bezier(0.4,0,0.2,1);
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  min-height: 100vh;
  overflow-x: hidden;
}

/* ── 背景網格紋路 ── */
body::before {
  content: '';
  position: fixed; inset: 0;
  background-image:
    linear-gradient(rgba(56,189,248,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(56,189,248,0.03) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: 0;
}

/* ── 導覽列 ── */
nav {
  position: sticky; top: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 clamp(1.5rem, 5vw, 4rem);
  height: 64px;
  background: rgba(9,13,19,0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}

.nav-logo {
  display: flex; align-items: center; gap: 10px;
  text-decoration: none;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.15rem;
  color: var(--sky);
  letter-spacing: 0.04em;
}
.nav-logo .logo-icon {
  width: 32px; height: 32px;
  background: var(--sky-dim);
  border: 1px solid var(--border2);
  border-radius: 8px;
  display: grid; place-items: center;
  font-size: 16px;
}

.nav-links {
  display: flex; align-items: center; gap: 0.25rem;
  list-style: none;
}
.nav-links a {
  display: block;
  padding: 0.4rem 0.85rem;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-mid);
  text-decoration: none;
  transition: color var(--trans), background var(--trans);
  letter-spacing: 0.02em;
}
.nav-links a:hover, .nav-links a.active {
  color: var(--sky);
  background: var(--sky-glow);
}

.nav-invite {
  font-family: var(--font-mono);
  font-size: 0.78rem !important;
  background: var(--sky-dim) !important;
  color: var(--sky) !important;
  border: 1px solid var(--border2);
}
.nav-invite:hover {
  background: rgba(56,189,248,0.25) !important;
}

/* ── 主要容器 ── */
main {
  position: relative; z-index: 1;
  max-width: 1100px;
  margin: 0 auto;
  padding: clamp(3rem,8vw,6rem) clamp(1.5rem,5vw,3rem);
}

/* ── 標題 ── */
h1, h2, h3 {
  font-family: var(--font-head);
  font-weight: 700;
  line-height: 1.2;
}
h1 { font-size: clamp(2.2rem, 5vw, 3.8rem); font-weight: 800; }
h2 { font-size: clamp(1.5rem, 3vw, 2.2rem); margin-bottom: 1.5rem; }
h3 { font-size: 1.1rem; margin-bottom: 0.75rem; }

.section-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--sky);
  margin-bottom: 0.75rem;
  display: flex; align-items: center; gap: 0.5rem;
}
.section-label::before {
  content: '';
  display: inline-block;
  width: 24px; height: 1px;
  background: var(--sky);
  opacity: 0.6;
}

/* ── 卡片 ── */
.card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  transition: border-color var(--trans), transform var(--trans);
}
.card:hover {
  border-color: var(--border2);
  transform: translateY(-2px);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
}

/* ── 分隔線 ── */
.divider {
  height: 1px;
  background: var(--border);
  margin: 3rem 0;
}

/* ── 徽章 ── */
.badge {
  display: inline-flex; align-items: center; gap: 0.35rem;
  padding: 0.25rem 0.7rem;
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}
.badge-sky   { background: var(--sky-dim);  color: var(--sky);   border: 1px solid rgba(56,189,248,0.3); }
.badge-green { background: rgba(52,211,153,0.12); color: var(--green); border: 1px solid rgba(52,211,153,0.3); }
.badge-amber { background: rgba(245,158,11,0.12); color: var(--amber); border: 1px solid rgba(245,158,11,0.3); }
.badge-red   { background: rgba(244,63,94,0.12);  color: var(--red);   border: 1px solid rgba(244,63,94,0.3); }

/* ── 脈動點 ── */
.pulse-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  display: inline-block;
  position: relative;
}
.pulse-dot::after {
  content: '';
  position: absolute; inset: -3px;
  border-radius: 50%;
  animation: pulse-ring 2s ease-out infinite;
}
.pulse-dot.green { background: var(--green); }
.pulse-dot.green::after { border: 1px solid var(--green); }
.pulse-dot.amber { background: var(--amber); }
.pulse-dot.amber::after { border: 1px solid var(--amber); }
.pulse-dot.red   { background: var(--red); }
.pulse-dot.red::after   { border: 1px solid var(--red); }

@keyframes pulse-ring {
  0%   { opacity: 0.8; transform: scale(1); }
  100% { opacity: 0;   transform: scale(2.2); }
}

/* ── 按鈕 ── */
.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.65rem 1.5rem;
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-decoration: none;
  border: none; cursor: pointer;
  transition: all var(--trans);
}
.btn-primary {
  background: var(--sky);
  color: var(--bg);
}
.btn-primary:hover { background: #7dd3fc; transform: translateY(-1px); }
.btn-outline {
  background: transparent;
  color: var(--sky);
  border: 1px solid var(--border2);
}
.btn-outline:hover { background: var(--sky-glow); }

/* ── 法律頁面文字 ── */
.legal-content h2 {
  font-size: 1.25rem;
  margin-top: 2.5rem;
  margin-bottom: 0.75rem;
  color: var(--sky);
}
.legal-content h2:first-child { margin-top: 0; }
.legal-content p, .legal-content li { color: var(--text-mid); margin-bottom: 0.75rem; }
.legal-content ul { padding-left: 1.5rem; }
.legal-content li { margin-bottom: 0.4rem; }
.legal-content a { color: var(--sky); }
.legal-meta {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-dim);
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

/* ── 頁尾 ── */
footer {
  position: relative; z-index: 1;
  text-align: center;
  padding: 2.5rem clamp(1.5rem,5vw,3rem);
  border-top: 1px solid var(--border);
  font-size: 0.82rem;
  color: var(--text-dim);
  font-family: var(--font-mono);
}
footer a { color: var(--sky); text-decoration: none; }
footer a:hover { text-decoration: underline; }
.footer-links { display: flex; justify-content: center; gap: 1.5rem; flex-wrap: wrap; margin-top: 0.75rem; }

/* ── 動畫 ── */
@keyframes fade-up {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}
.fade-up { animation: fade-up 0.6s ease both; }
.fade-up-1 { animation-delay: 0.1s; }
.fade-up-2 { animation-delay: 0.2s; }
.fade-up-3 { animation-delay: 0.3s; }
.fade-up-4 { animation-delay: 0.4s; }

/* ── 手機響應式 ── */
@media (max-width: 640px) {
  .nav-links { display: none; }
  .card-grid { grid-template-columns: 1fr; }
}