/* SUPERIOR PDR 卓越學院 — 沿用官網品牌色系 */
:root {
  --bg: #07080b;
  --bg-elev: #0d1014;
  --bg-card: #11151b;
  --line: #1d2230;
  --line-bright: #2a3142;
  --ink: #f3f5f8;
  --ink-dim: #9aa3b2;
  --ink-mute: #5e6675;
  --accent: #ff2a3d;
  --gold: #d4a45a;
  --ok: #35c46b;
  --radius: 14px;
  --font: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button, input, select, textarea { font-family: inherit; font-size: inherit; }

/* ── 版頭 ── */
.topbar {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; gap: 16px;
  padding: 14px 24px;
  background: rgba(7, 8, 11, .88);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: baseline; gap: 10px; font-weight: 800; letter-spacing: .04em; }
.brand b { color: var(--accent); }
.brand span { font-size: 12px; color: var(--ink-mute); letter-spacing: .18em; }
.topbar .spacer { flex: 1; }
.topbar nav { display: flex; gap: 18px; font-size: 14px; color: var(--ink-dim); }
.topbar nav a:hover, .topbar nav a.on { color: var(--ink); }

.wrap { max-width: 1180px; margin: 0 auto; padding: 32px 24px 80px; }
.page-title { font-size: 26px; font-weight: 800; margin: 0 0 6px; letter-spacing: .02em; }
.page-sub { color: var(--ink-dim); font-size: 14px; margin: 0 0 28px; }

/* ── 卡片 ── */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 20px; }
.card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color .18s, transform .18s;
}
.card:hover { border-color: var(--line-bright); transform: translateY(-2px); }
.card .thumb {
  aspect-ratio: 16 / 9; background: #0a0c10 center/cover no-repeat;
  display: flex; align-items: center; justify-content: center;
  color: var(--ink-mute); font-size: 13px; border-bottom: 1px solid var(--line);
}
.card .body { padding: 16px 18px 18px; }
.card h3 { margin: 0 0 4px; font-size: 17px; font-weight: 700; }
.card .meta { font-size: 12.5px; color: var(--ink-mute); display: flex; gap: 12px; flex-wrap: wrap; }
.card p { font-size: 13.5px; color: var(--ink-dim); margin: 10px 0 0; }

.bar { height: 4px; background: var(--line); border-radius: 99px; overflow: hidden; margin-top: 14px; }
.bar i { display: block; height: 100%; background: linear-gradient(90deg, var(--accent), var(--gold)); }

/* ── 單元列表 ── */
.lesson-list { border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.lesson {
  display: flex; align-items: center; gap: 16px;
  padding: 14px 18px; border-bottom: 1px solid var(--line);
  background: var(--bg-card); transition: background .15s;
}
.lesson:last-child { border-bottom: 0; }
.lesson:hover { background: #151a22; }
.lesson .num {
  width: 30px; height: 30px; flex: none; border-radius: 8px;
  display: grid; place-items: center; font-size: 13px; font-weight: 700;
  background: #0a0c10; border: 1px solid var(--line); color: var(--ink-dim);
}
.lesson.done .num { background: rgba(53,196,107,.12); border-color: rgba(53,196,107,.4); color: var(--ok); }
.lesson .info { flex: 1; min-width: 0; }
.lesson .info b { display: block; font-weight: 600; font-size: 15px; }
.lesson .info small { color: var(--ink-mute); font-size: 12.5px; }
.lesson .dur { color: var(--ink-mute); font-size: 13px; font-variant-numeric: tabular-nums; }

/* ── 按鈕 / 表單 ── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 18px; border-radius: 10px; cursor: pointer;
  border: 1px solid var(--line-bright); background: var(--bg-elev); color: var(--ink);
  font-weight: 600; font-size: 14px; transition: .15s;
}
.btn:hover { border-color: var(--ink-mute); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover { filter: brightness(1.1); }
.btn.ghost { background: transparent; }
.btn.sm { padding: 6px 12px; font-size: 13px; border-radius: 8px; }
.btn.danger { color: #ff7b86; border-color: #45222a; }
.btn:disabled { opacity: .5; cursor: not-allowed; }

label { display: block; font-size: 13px; color: var(--ink-dim); margin: 0 0 6px; }
input, select, textarea {
  width: 100%; padding: 11px 13px; border-radius: 10px;
  background: #0a0c10; border: 1px solid var(--line); color: var(--ink); outline: none;
}
input:focus, select:focus, textarea:focus { border-color: var(--line-bright); }
.field { margin-bottom: 16px; }
.row { display: flex; gap: 12px; flex-wrap: wrap; }
.row > * { flex: 1; min-width: 160px; }

.notice { padding: 12px 15px; border-radius: 10px; font-size: 14px; margin-bottom: 18px; }
.notice.err { background: rgba(255,42,61,.1); border: 1px solid rgba(255,42,61,.3); color: #ff9aa4; }
.notice.ok { background: rgba(53,196,107,.1); border: 1px solid rgba(53,196,107,.3); color: #7fe0a4; }
.notice.warn { background: rgba(212,164,90,.1); border: 1px solid rgba(212,164,90,.3); color: var(--gold); }

.empty { text-align: center; padding: 70px 20px; color: var(--ink-mute); }

/* ── 登入頁 ── */
.auth-shell { min-height: 100vh; display: grid; place-items: center; padding: 24px; }
.auth-box { width: 100%; max-width: 400px; }
.auth-box .logo { text-align: center; margin-bottom: 30px; }
.auth-box .logo h1 { font-size: 22px; margin: 0 0 6px; letter-spacing: .06em; }
.auth-box .logo h1 b { color: var(--accent); }
.auth-box .logo p { color: var(--ink-mute); font-size: 12px; letter-spacing: .2em; margin: 0; }
.auth-card { background: var(--bg-card); border: 1px solid var(--line); border-radius: 16px; padding: 28px; }
.auth-foot { text-align: center; color: var(--ink-mute); font-size: 12.5px; margin-top: 22px; line-height: 1.8; }

/* ── 播放頁 ── */
.player-shell { max-width: 1180px; margin: 0 auto; padding: 24px; }
.stage {
  position: relative; aspect-ratio: 16 / 9; background: #000;
  border-radius: var(--radius); overflow: hidden; border: 1px solid var(--line);
}
.stage iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
/* 個人化浮水印：飄移、不擋操作、無法從畫面剝離 */
/* 亮畫面也要讀得出來，否則等於沒有浮水印：淡色膠囊底 + 描邊 */
.wm {
  position: absolute; pointer-events: none; z-index: 9;
  padding: 7px 12px; border-radius: 8px;
  background: rgba(0, 0, 0, .34);
  font-size: 13px; line-height: 1.4; letter-spacing: .03em;
  color: rgba(255, 255, 255, .78);
  text-shadow: 0 0 3px rgba(0,0,0,.95), 0 1px 5px rgba(0,0,0,.85);
  transition: left 1.4s ease-in-out, top 1.4s ease-in-out;
  user-select: none; white-space: nowrap;
}
.wm b { display: block; font-weight: 700; font-size: 14px; color: rgba(255,255,255,.92); }
.wm small { display: block; font-size: 11px; opacity: .82; }
.player-meta { display: flex; align-items: flex-start; gap: 20px; margin-top: 22px; flex-wrap: wrap; }
.player-meta h2 { margin: 0 0 4px; font-size: 20px; }
.player-meta .crumb { color: var(--ink-mute); font-size: 13px; }

/* ── 表格（後台） ── */
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { padding: 11px 12px; text-align: left; border-bottom: 1px solid var(--line); }
th { color: var(--ink-mute); font-weight: 600; font-size: 12.5px; letter-spacing: .05em; }
td .btn.sm { margin-right: 4px; }
tbody tr:hover { background: #0f1319; }

.tabs { display: flex; gap: 6px; border-bottom: 1px solid var(--line); margin-bottom: 26px; flex-wrap: wrap; }
.tabs button {
  padding: 10px 16px; background: none; border: 0; border-bottom: 2px solid transparent;
  color: var(--ink-mute); cursor: pointer; font-weight: 600; font-size: 14px;
}
.tabs button.on { color: var(--ink); border-bottom-color: var(--accent); }

.pill { display: inline-block; padding: 2px 9px; border-radius: 99px; font-size: 11.5px; font-weight: 600; }
.pill.on { background: rgba(53,196,107,.14); color: var(--ok); }
.pill.off { background: rgba(255,42,61,.12); color: #ff8a95; }
.pill.gold { background: rgba(212,164,90,.14); color: var(--gold); }

.stat-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 14px; margin-bottom: 28px; }
.stat { background: var(--bg-card); border: 1px solid var(--line); border-radius: 12px; padding: 16px 18px; }
.stat b { display: block; font-size: 26px; font-weight: 800; font-variant-numeric: tabular-nums; }
.stat span { font-size: 12.5px; color: var(--ink-mute); }

dialog {
  border: 1px solid var(--line); background: var(--bg-card); color: var(--ink);
  border-radius: 16px; padding: 26px; max-width: 560px; width: calc(100% - 40px);
}
dialog::backdrop { background: rgba(0,0,0,.7); }
dialog h3 { margin: 0 0 18px; font-size: 18px; }
.dialog-foot { display: flex; justify-content: flex-end; gap: 10px; margin-top: 22px; }

.scroll-x { overflow-x: auto; }

@media (max-width: 620px) {
  .wrap, .player-shell { padding: 20px 16px 60px; }
  .topbar { padding: 12px 16px; gap: 10px; }
  .topbar nav { font-size: 13px; gap: 12px; }
  .brand span { display: none; }
}