/* Vibe Coding 實戰課：全站樣式。CSP 的 font-src 只允許 'self'，所以只用系統字型。顏色一律走 token。 */
:root {
  --bg: #f5f6f8;
  --surface: #ffffff;
  --surface-2: #eceef2;
  --ink: #16181d;
  --ink-2: #4a505c;
  --line: #d9dce3;
  --accent: #2a5bd7;
  --accent-ink: #ffffff;
  --accent-soft: #e4ebfb;
  --free: #0f8a5f;
  --free-soft: #def3ea;
  --warn: #9a5b00;
  --warn-soft: #fbefd9;
  --err: #b42318;
  --err-soft: #fde8e6;
  --code-bg: #16181d;
  --code-ink: #d8dee9;
  --radius: 10px;
  --font: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", system-ui, sans-serif;
  --mono: ui-monospace, "Cascadia Mono", Consolas, "Liberation Mono", monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #111318; --surface: #1a1d24; --surface-2: #232731; --ink: #e8eaef; --ink-2: #a3a9b6;
    --line: #2e333e; --accent: #7aa2ff; --accent-ink: #0d1220; --accent-soft: #1f2a44;
    --free: #4fd1a1; --free-soft: #133328; --warn: #f0b45a; --warn-soft: #3a2a10;
    --err: #ff8a80; --err-soft: #3d1a18; --code-bg: #0b0d11; --code-ink: #d8dee9;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #111318; --surface: #1a1d24; --surface-2: #232731; --ink: #e8eaef; --ink-2: #a3a9b6;
  --line: #2e333e; --accent: #7aa2ff; --accent-ink: #0d1220; --accent-soft: #1f2a44;
  --free: #4fd1a1; --free-soft: #133328; --warn: #f0b45a; --warn-soft: #3a2a10;
  --err: #ff8a80; --err-soft: #3d1a18; --code-bg: #0b0d11; --code-ink: #d8dee9;
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 16px/1.7 var(--font);
  display: flex; flex-direction: column; min-height: 100vh;
}
[hidden] { display: none !important; }
img { max-width: 100%; }
a { color: var(--accent); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
h1, h2, h3 { line-height: 1.3; text-wrap: balance; margin: 0 0 .5em; }
h1 { font-size: clamp(1.6rem, 1.2rem + 1.6vw, 2.2rem); }
h2 { font-size: 1.3rem; }
h3 { font-size: 1.05rem; }
p { margin: 0 0 .8em; }
.mono { font-family: var(--mono); font-size: .92em; }
.num { font-variant-numeric: tabular-nums; text-align: right; white-space: nowrap; }
.hint { color: var(--ink-2); font-size: .9rem; }
.pre { white-space: pre-wrap; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ---- 頁首／頁尾 ---- */
.masthead { background: var(--surface); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 5; }
.masthead-inner, .hero-inner, .page, .foot-inner { width: 100%; max-width: 1080px; margin: 0 auto; padding-inline: 16px; }
.masthead-inner { display: flex; align-items: center; justify-content: space-between; gap: 12px 20px; flex-wrap: wrap; padding-block: 12px; }
.logo { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; font-size: 1.05rem; }
.logo-mark { font-family: var(--mono); font-weight: 700; background: var(--ink); color: var(--bg); border-radius: 6px; padding: 1px 7px; font-size: .9rem; }
.site-nav { display: flex; align-items: center; gap: 4px 18px; flex-wrap: wrap; font-size: .95rem; }
.site-nav a { color: var(--ink); text-decoration: none; }
.site-nav a:hover { color: var(--accent); }
.nav-user { display: inline-flex; align-items: center; gap: 10px; color: var(--ink-2); }
.btn-link { background: none; border: 0; padding: 0; color: var(--accent); font: inherit; cursor: pointer; text-decoration: underline; text-underline-offset: 3px; }

.site-foot { margin-top: auto; border-top: 1px solid var(--line); background: var(--surface); }
.foot-inner { padding-block: 24px 32px; color: var(--ink-2); font-size: .9rem; }
.foot-inner b { color: var(--ink); display: block; margin-bottom: 4px; }

/* ---- 首頁 hero ---- */
.hero { background: var(--code-bg); color: var(--code-ink); }
.hero-inner { padding-block: 48px 52px; }
.hero h1 { color: #fff; font-size: clamp(1.8rem, 1.2rem + 2.6vw, 2.9rem); max-width: 18em; }
.hero-prompt { color: #8fb4ff; margin-bottom: 18px; }
.hero-prompt span { color: #4fd1a1; margin-right: 6px; }
.hero-lead { max-width: 40em; color: #b9c1cf; margin: 0; }

/* ---- 版面 ---- */
.page { flex: 1; padding-block: 32px 48px; display: flex; flex-direction: column; gap: 36px; }
.page.narrow { max-width: 520px; }
.block-title { font-size: 1.15rem; padding-bottom: 8px; margin-bottom: 16px; border-bottom: 2px solid var(--ink); }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; }
.notice { background: var(--accent-soft); border-radius: 8px; padding: 10px 14px; }
.empty { color: var(--ink-2); }
.errors { background: var(--err-soft); color: var(--err); border-radius: 8px; padding: 10px 14px; }
.errors ul { margin: 0; padding-left: 1.2em; }
.crumb { margin: 0; font-size: .92rem; }
.lead { font-size: 1.08rem; color: var(--ink-2); }

/* ---- 課程列表 ---- */
.course-grid { list-style: none; margin: 0; padding: 0; display: grid; gap: 16px; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }
.course-item a { display: flex; flex-direction: column; height: 100%; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; color: var(--ink); text-decoration: none; transition: border-color .15s; }
.course-item a:hover { border-color: var(--accent); }
.course-item h3 { font-size: 1.15rem; }
.course-item p { color: var(--ink-2); }
.course-meta { display: flex; align-items: baseline; flex-wrap: wrap; gap: 6px 12px; margin: auto 0 0; }
.course-price { font-weight: 700; font-size: 1.15rem; color: var(--ink); font-variant-numeric: tabular-nums; }
.badge { display: inline-block; font-size: .78rem; padding: 1px 8px; border-radius: 999px; background: var(--warn-soft); color: var(--warn); }
.badge.owned { background: var(--free-soft); color: var(--free); }

/* ---- 訂單 ---- */
.table-wrap { overflow-x: auto; }
.list { width: 100%; border-collapse: collapse; font-size: .93rem; background: var(--surface); }
.list th, .list td { padding: 10px 12px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.list th { background: var(--surface-2); font-weight: 600; white-space: nowrap; }
.list td small { display: block; color: var(--ink-2); }
.order-st { white-space: nowrap; font-weight: 600; }
.st-0 { color: var(--warn); }
.st-1 { color: var(--free); }
.st-8, .st-9 { color: var(--ink-2); }
.acts { white-space: nowrap; }
.acts > * + * { margin-left: 6px; }
.pay-info { background: var(--surface); border: 1px solid var(--line); border-left: 4px solid var(--accent); border-radius: 8px; padding: 14px 18px; margin-bottom: 16px; }
.pay-info h3 { margin-bottom: 6px; }
.report-form { margin-top: 16px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 18px; display: flex; flex-direction: column; gap: 12px; }
.row-btns { display: flex; gap: 10px; flex-wrap: wrap; }
.notes { margin: 0; padding-left: 1.2em; display: flex; flex-direction: column; gap: 6px; max-width: 46em; }

/* ---- 課程頁 ---- */
.course-layout { display: grid; gap: 32px; grid-template-columns: minmax(0, 1fr) 320px; align-items: start; }
.course-main { display: flex; flex-direction: column; gap: 32px; min-width: 0; }
.course-head h1 { margin-bottom: .3em; }
.buy-box { position: sticky; top: 76px; display: flex; flex-direction: column; gap: 12px; }
.buy-box .block-title { margin-bottom: 4px; }
.player { position: relative; width: 100%; max-width: 100%; aspect-ratio: 16 / 9; background: #000; border-radius: 8px; overflow: hidden; }
.player iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.lessons { list-style: none; counter-reset: lesson; margin: 0; padding: 0; border-top: 1px solid var(--line); }
.lesson { counter-increment: lesson; display: flex; align-items: center; gap: 12px; padding: 12px 4px; border-bottom: 1px solid var(--line); }
.lesson::before { content: counter(lesson, decimal-leading-zero); font-family: var(--mono); color: var(--ink-2); font-size: .85rem; min-width: 2ch; }
.lesson-main { flex: 1; min-width: 0; display: flex; flex-wrap: wrap; align-items: baseline; gap: 4px 10px; }
.lesson-title { font-weight: 500; }
.tag { font-size: .75rem; padding: 0 7px; border-radius: 4px; }
.lesson-free { background: var(--free-soft); color: var(--free); }
.info { width: 100%; border-collapse: collapse; font-size: .92rem; }
.info th, .info td { text-align: left; padding: 6px 0; vertical-align: top; border-bottom: 1px dashed var(--line); }
.info th { width: 3.5em; color: var(--ink-2); font-weight: 500; }
.agree { display: flex; gap: 8px; align-items: flex-start; font-size: .9rem; margin: 12px 0; }
.agree input { margin-top: .35em; flex: none; }
#cForm { display: flex; flex-direction: column; gap: 8px; }

/* ---- 表單與按鈕 ---- */
.stack { display: flex; flex-direction: column; gap: 14px; margin-top: 16px; }
label { display: flex; flex-direction: column; gap: 4px; font-size: .92rem; }
input[type="email"], input[type="password"], input[type="text"] {
  font: inherit; color: var(--ink); background: var(--bg); border: 1px solid var(--line); border-radius: 8px; padding: 9px 12px; width: 100%;
}
input:focus { border-color: var(--accent); outline: none; box-shadow: 0 0 0 3px var(--accent-soft); }
button { font: inherit; cursor: pointer; border-radius: 8px; border: 1px solid var(--accent); background: var(--accent); color: var(--accent-ink); padding: 9px 18px; font-weight: 600; }
button:hover { filter: brightness(1.08); }
button:disabled { opacity: .55; cursor: default; filter: none; }
.btn-secondary { background: transparent; color: var(--ink); border-color: var(--line); }
.btn-mini { display: inline-block; font-size: .85rem; padding: 3px 12px; font-weight: 600; text-decoration: none; border-radius: 6px; border: 1px solid var(--accent); background: transparent; color: var(--accent); }
.btn-mini:hover { background: var(--accent-soft); filter: none; }
.captcha { min-height: 65px; }
.links { display: flex; flex-wrap: wrap; gap: 6px 18px; margin: 16px 0 0; font-size: .92rem; }

@media (max-width: 820px) {
  .course-layout { grid-template-columns: minmax(0, 1fr); }
  .buy-box { position: static; }
}
@media (max-width: 480px) {
  .hero-inner { padding-block: 36px 40px; }
  .page { padding-block: 24px 36px; gap: 28px; }
  .card { padding: 16px; }
}