:root {
  --bg: #0d1117;
  --bg-soft: #161b22;
  --card: #1c2333;
  --border: #2a3350;
  --text: #e6edf3;
  --muted: #9aa7bd;
  --brand: #5b8cff;
  --brand-2: #a55bff;
  --accent: #2fd8a8;
  --danger: #ff6b6b;
  --warn: #ffb84d;
  --radius: 14px;
  --shadow: 0 10px 40px rgba(0,0,0,.35);
  --maxw: 1080px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

/* Nav */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(13,17,23,.82);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav-inner { display: flex; align-items: center; gap: 16px; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 1.05rem; color: var(--text); }
.brand .logo {
  width: 34px; height: 34px; border-radius: 9px;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  display: grid; place-items: center; font-size: 18px; font-weight: 900; color: #fff;
}
.brand small { display:block; font-size:.66rem; color: var(--muted); font-weight:600; letter-spacing:.08em; }
.nav .spacer { flex: 1; }
.nav a.navlink { color: var(--muted); font-weight: 600; font-size: .95rem; padding: 6px 4px; }
.nav a.navlink:hover { color: var(--text); text-decoration: none; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 11px 20px; border-radius: 10px; border: 1px solid transparent;
  font-weight: 700; font-size: .95rem; cursor: pointer; transition: .15s;
  background: var(--card); color: var(--text);
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary { background: linear-gradient(135deg, var(--brand), var(--brand-2)); color: #fff; }
.btn-primary:hover { box-shadow: 0 8px 24px rgba(91,140,255,.35); }
.btn-ghost { background: transparent; border-color: var(--border); color: var(--text); }
.btn-ghost:hover { border-color: var(--brand); }
.btn-sm { padding: 6px 12px; font-size: .82rem; border-radius: 8px; }
.btn-danger { background: transparent; border-color: var(--danger); color: var(--danger); }
.btn-block { width: 100%; }
.btn:disabled { opacity:.55; cursor: not-allowed; transform:none; }

/* Hero */
.hero { padding: 84px 0 60px; position: relative; overflow: hidden; }
.hero::before {
  content:""; position:absolute; inset:-40% -20% auto -20%; height: 600px;
  background: radial-gradient(60% 60% at 30% 20%, rgba(91,140,255,.22), transparent 70%),
              radial-gradient(50% 50% at 80% 10%, rgba(165,91,255,.20), transparent 70%);
  pointer-events:none;
}
.hero .eyebrow {
  display:inline-block; font-weight:700; letter-spacing:.14em; font-size:.8rem;
  color: var(--accent); border:1px solid var(--border); padding:5px 12px; border-radius:999px;
  background: var(--bg-soft);
}
.hero h1 { font-size: clamp(2.1rem, 5vw, 3.4rem); line-height: 1.15; margin: 20px 0 10px; letter-spacing:-.01em; }
.hero h1 .grad { background: linear-gradient(120deg, var(--brand), var(--brand-2), var(--accent)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero .sub { font-size: 1.2rem; color: var(--muted); max-width: 640px; }
.hero .flow { margin-top: 20px; font-size:.95rem; color: var(--muted); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
.hero .flow b { color: var(--text); }
.hero-cta { margin-top: 30px; display: flex; gap: 12px; flex-wrap: wrap; }

/* Sections */
section.block { padding: 56px 0; border-top: 1px solid var(--border); }
.section-title { font-size: 1.8rem; margin: 0 0 6px; }
.section-desc { color: var(--muted); margin: 0 0 28px; }
.tag { color: var(--brand); font-weight: 700; letter-spacing:.1em; font-size:.8rem; }

/* Grid cards */
.grid { display: grid; gap: 18px; }
.grid.cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid.cols-4 { grid-template-columns: repeat(4, 1fr); }
.card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 22px;
}
.card h3 { margin: 0 0 8px; font-size: 1.12rem; }
.card p { margin: 0; color: var(--muted); font-size: .95rem; }
.card .num { font-size: .8rem; font-weight: 800; color: var(--brand); letter-spacing: .1em; }
.card .mins { font-size:.8rem; color: var(--accent); font-weight:700; }

/* Pricing */
.price-wrap { display:grid; grid-template-columns: repeat(2,1fr); gap:18px; }
.price {
  border:1px solid var(--border); border-radius: var(--radius); padding: 26px; background: var(--card);
}
.price.featured { border-color: var(--brand); box-shadow: var(--shadow); position: relative; }
.price.featured::after { content:"早鳥"; position:absolute; top:-11px; right:20px; background: var(--brand); color:#fff; font-size:.72rem; font-weight:800; padding:3px 10px; border-radius:999px; }
.price .amount { font-size: 2.4rem; font-weight: 900; margin: 6px 0; }
.price .amount small { font-size: 1rem; color: var(--muted); font-weight:600; }
.price ul { list-style: none; padding: 0; margin: 16px 0 0; }
.price li { padding: 6px 0 6px 26px; position: relative; color: var(--muted); font-size:.92rem; }
.price li::before { content:"✓"; position:absolute; left:0; color: var(--accent); font-weight:900; }

/* Sessions list */
.sess { display:flex; align-items:center; justify-content:space-between; gap:14px; padding:16px 18px; border:1px solid var(--border); border-radius:12px; background: var(--card); margin-bottom:10px; flex-wrap: wrap; }
.sess .meta { display:flex; gap: 20px; flex-wrap: wrap; align-items:center; }
.sess .date { font-weight:800; font-size:1.05rem; }
.sess .pill { font-size:.78rem; padding:3px 10px; border-radius:999px; background: var(--bg-soft); border:1px solid var(--border); color: var(--muted); }

/* Forms */
.auth-wrap { max-width: 440px; margin: 60px auto; padding: 0 20px; }
.auth-card { background: var(--card); border:1px solid var(--border); border-radius: var(--radius); padding: 32px; box-shadow: var(--shadow); }
.auth-card h1 { margin: 0 0 4px; font-size: 1.5rem; }
.auth-card .lead { color: var(--muted); margin: 0 0 22px; font-size:.95rem; }
.field { margin-bottom: 16px; }
.field label { display:block; font-size:.85rem; font-weight:700; margin-bottom:6px; color: var(--text); }
.field input, .field select {
  width:100%; padding:11px 13px; border-radius:10px; border:1px solid var(--border);
  background: var(--bg-soft); color: var(--text); font-size:.95rem; font-family: inherit;
}
.field input:focus, .field select:focus { outline: none; border-color: var(--brand); }
.hint { font-size:.82rem; color: var(--muted); margin-top:6px; }
.form-foot { margin-top: 18px; text-align:center; font-size:.9rem; color: var(--muted); }

/* Alerts */
.alert { padding:12px 15px; border-radius:10px; font-size:.9rem; margin-bottom:16px; display:none; }
.alert.show { display:block; }
.alert-error { background: rgba(255,107,107,.12); border:1px solid rgba(255,107,107,.4); color:#ffb0b0; }
.alert-ok { background: rgba(47,216,168,.12); border:1px solid rgba(47,216,168,.4); color: #8ff0d3; }
.alert-info { background: rgba(91,140,255,.12); border:1px solid rgba(91,140,255,.4); color:#bcd0ff; }
.alert code { background: rgba(0,0,0,.35); padding:2px 6px; border-radius:5px; word-break: break-all; }

/* Dashboard / admin */
.page { padding: 40px 0 80px; }
.page h1 { margin: 0 0 4px; }
.page .muted { color: var(--muted); }
.stat-row { display:grid; grid-template-columns: repeat(4,1fr); gap:14px; margin: 24px 0; }
.stat { background: var(--card); border:1px solid var(--border); border-radius:12px; padding:18px; }
.stat .n { font-size:2rem; font-weight:900; }
.stat .l { color: var(--muted); font-size:.85rem; }
table { width:100%; border-collapse: collapse; background: var(--card); border-radius:12px; overflow:hidden; border:1px solid var(--border); }
th, td { text-align:left; padding:12px 14px; border-bottom:1px solid var(--border); font-size:.9rem; }
th { background: var(--bg-soft); color: var(--muted); font-weight:700; font-size:.8rem; letter-spacing:.05em; }
tr:last-child td { border-bottom: none; }
.badge { font-size:.75rem; padding:3px 9px; border-radius:999px; font-weight:700; }
.badge.pending { background: rgba(255,184,77,.15); color: var(--warn); }
.badge.confirmed { background: rgba(47,216,168,.15); color: var(--accent); }
.badge.cancelled { background: rgba(255,107,107,.15); color: var(--danger); }
.tabs { display:flex; gap:8px; margin: 22px 0; flex-wrap: wrap; }
.tabs button { padding:8px 16px; border-radius:999px; border:1px solid var(--border); background: var(--card); color: var(--muted); font-weight:700; cursor:pointer; }
.tabs button.active { background: var(--brand); color:#fff; border-color: var(--brand); }
.tabpane { display:none; }
.tabpane.active { display:block; }
.table-wrap { overflow-x:auto; }

/* Footer */
footer { border-top:1px solid var(--border); padding: 30px 0; color: var(--muted); font-size:.88rem; }
.footer-inner { display:flex; justify-content:space-between; gap:16px; flex-wrap:wrap; }

@media (max-width: 820px) {
  .grid.cols-3, .grid.cols-4, .price-wrap { grid-template-columns: 1fr; }
  .grid.cols-2 { grid-template-columns: 1fr; }
  .stat-row { grid-template-columns: repeat(2,1fr); }
  .nav a.navlink.hide-sm { display: none; }
}