:root {
  --bg: #0b0d12;
  --bg-2: #11141b;
  --card: #151922;
  --line: #232835;
  --text: #e6e8ee;
  --muted: #8a92a6;
  --accent: #7c9cff;
  --accent-2: #5be0c2;
  --warn: #f5b04c;
  --radius: 14px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { max-width: 1080px; margin: 0 auto; padding: 0 20px; }

/* 導覽列 */
.nav {
  position: sticky; top: 0; z-index: 10;
  background: rgba(11, 13, 18, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav .wrap { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); font-weight: 600; letter-spacing: .3px; }
.brand:hover { text-decoration: none; }
.brand svg { width: 26px; height: 26px; }
.nav-links { display: flex; gap: 22px; align-items: center; font-size: 14px; }
.nav-links a { color: var(--muted); }
.nav-links a:hover { color: var(--text); text-decoration: none; }

.btn {
  display: inline-block; padding: 9px 18px; border-radius: 10px;
  font-size: 14px; font-weight: 500; border: 1px solid var(--line);
  color: var(--text); background: var(--card); cursor: pointer;
}
.btn:hover { text-decoration: none; border-color: #36405a; }
.btn-primary { background: var(--accent); border-color: var(--accent); color: #0b0d12; }
.btn-primary:hover { background: #95afff; border-color: #95afff; }
.nav-links .btn { color: var(--text); }

/* 主視覺 */
.hero { padding: 96px 0 72px; text-align: center; position: relative; overflow: hidden; }
.hero::before {
  content: ""; position: absolute; inset: -40% -20% auto; height: 520px;
  background: radial-gradient(closest-side, rgba(124, 156, 255, .18), transparent);
  pointer-events: none;
}
.badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 5px 12px; border-radius: 999px; font-size: 13px;
  color: var(--warn); border: 1px solid rgba(245, 176, 76, .35); background: rgba(245, 176, 76, .08);
}
.badge .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--warn); animation: pulse 1.8s infinite; }
@keyframes pulse { 50% { opacity: .3; } }
.hero h1 { font-size: clamp(34px, 6vw, 56px); line-height: 1.15; margin: 22px 0 16px; letter-spacing: -.5px; }
.hero h1 span {
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero p { color: var(--muted); font-size: 18px; max-width: 640px; margin: 0 auto 32px; }
.hero .actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* 時間軸示意 */
.timeline-demo {
  margin: 56px auto 0; max-width: 820px; padding: 22px 24px;
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  text-align: left; font-family: var(--mono); font-size: 13px; color: var(--muted);
}
.timeline-demo .bar { display: flex; gap: 6px; margin-bottom: 16px; }
.timeline-demo .bar i { width: 10px; height: 10px; border-radius: 50%; background: #2c3242; display: block; }
.track { position: relative; height: 44px; margin: 8px 0 14px; }
.track::before { content: ""; position: absolute; left: 0; right: 0; top: 21px; height: 2px; background: var(--line); }
.track .snap {
  position: absolute; top: 15px; width: 14px; height: 14px; border-radius: 50%;
  background: var(--bg-2); border: 2px solid var(--accent);
}
.track .snap.now { border-color: var(--accent-2); background: var(--accent-2); box-shadow: 0 0 0 6px rgba(91, 224, 194, .15); }
.log-line { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.log-line b { color: var(--accent-2); font-weight: 500; }
.log-line em { color: var(--text); font-style: normal; }

/* 區塊 */
section { padding: 72px 0; border-top: 1px solid var(--line); }
.section-head { text-align: center; margin-bottom: 44px; }
.section-head h2 { font-size: 30px; margin: 0 0 10px; }
.section-head p { color: var(--muted); margin: 0; }

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 18px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; }
.card .ico {
  width: 40px; height: 40px; border-radius: 10px; display: grid; place-items: center;
  background: rgba(124, 156, 255, .12); color: var(--accent); margin-bottom: 14px;
}
.card h3 { margin: 0 0 8px; font-size: 17px; }
.card p { margin: 0; color: var(--muted); font-size: 14px; }

/* 開發路線 */
.roadmap { max-width: 720px; margin: 0 auto; }
.rm-item { display: grid; grid-template-columns: 120px 1fr; gap: 20px; padding: 18px 0; border-bottom: 1px dashed var(--line); }
.rm-item:last-child { border-bottom: 0; }
.rm-when { font-family: var(--mono); font-size: 13px; color: var(--muted); padding-top: 2px; }
.rm-item h4 { margin: 0 0 4px; font-size: 16px; display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.rm-item p { margin: 0; color: var(--muted); font-size: 14px; }
.tag { font-size: 12px; font-weight: 500; padding: 2px 8px; border-radius: 6px; }
.tag.done { color: var(--accent-2); background: rgba(91, 224, 194, .1); }
.tag.wip { color: var(--warn); background: rgba(245, 176, 76, .1); }
.tag.plan { color: var(--muted); background: #1c2130; }

/* 頁尾 */
footer { border-top: 1px solid var(--line); padding: 32px 0 40px; color: var(--muted); font-size: 13px; }
footer .wrap { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; }

/* 登入頁 */
.auth { min-height: calc(100vh - 60px); display: grid; place-items: center; padding: 40px 20px; }
.auth-box { width: 100%; max-width: 400px; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 32px 28px; }
.auth-box h1 { font-size: 22px; margin: 0 0 6px; }
.auth-box .sub { color: var(--muted); font-size: 14px; margin: 0 0 24px; }
.field { margin-bottom: 16px; }
.field label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 6px; }
.field input {
  width: 100%; padding: 11px 12px; border-radius: 10px; font-size: 15px;
  background: var(--bg-2); border: 1px solid var(--line); color: var(--text); font-family: var(--font);
}
.field input:focus { outline: none; border-color: var(--accent); }
.auth-box .btn { width: 100%; padding: 11px; font-size: 15px; }
.notice {
  display: none; margin-top: 16px; padding: 10px 12px; border-radius: 10px; font-size: 13px;
  color: var(--warn); background: rgba(245, 176, 76, .08); border: 1px solid rgba(245, 176, 76, .3);
}
.notice.show { display: block; }
.auth-foot { margin-top: 20px; font-size: 13px; color: var(--muted); text-align: center; }

/* 404 */
.err { min-height: calc(100vh - 60px); display: grid; place-items: center; text-align: center; padding: 40px 20px; }
.err h1 { font-family: var(--mono); font-size: 72px; margin: 0; color: var(--accent); }
.err p { color: var(--muted); }

@media (max-width: 640px) {
  .nav-links a:not(.btn) { display: none; }
  .hero { padding: 64px 0 48px; }
  .rm-item { grid-template-columns: 1fr; gap: 4px; }
}