/* JT Live Studio 官網：深色底、粉紅→紫→青的極光漸層 */
:root {
  --bg: #07070d;
  --bg-2: #0e0e18;
  --card: rgba(255, 255, 255, .045);
  --card-solid: #13131f;
  --line: rgba(255, 255, 255, .09);
  --text: #f3f2fb;
  --muted: #a7a5bd;
  --pink: #ff2d78;
  --violet: #8b5cf6;
  --cyan: #22e3f0;
  --gold: #ffd166;
  --grad: linear-gradient(115deg, var(--pink), var(--violet) 52%, var(--cyan));
  --radius: 20px;
  --font: "Noto Sans TC", -apple-system, BlinkMacSystemFont, "PingFang TC", "Microsoft JhengHei", sans-serif;
  --display: "Outfit", "Noto Sans TC", sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--bg); color: var(--text); font: 16px/1.75 var(--font);
  -webkit-font-smoothing: antialiased; overflow-x: hidden;
}
/* 背景的極光 */
body::before {
  content: ""; position: fixed; inset: -20% -10% auto; height: 90vh; z-index: -1; pointer-events: none;
  background:
    radial-gradient(40% 50% at 20% 30%, rgba(255, 45, 120, .22), transparent 70%),
    radial-gradient(35% 45% at 75% 20%, rgba(139, 92, 246, .22), transparent 70%),
    radial-gradient(30% 40% at 55% 70%, rgba(34, 227, 240, .12), transparent 70%);
  filter: blur(20px);
}
a { color: var(--cyan); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; display: block; }
.wrap { width: min(1160px, 100% - 32px); margin: 0 auto; }
.grad-text { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }

/* ---------- 頁首 ---------- */
.nav { position: sticky; top: 0; z-index: 20; backdrop-filter: blur(14px); background: rgba(7, 7, 13, .72); border-bottom: 1px solid var(--line); }
.nav .wrap { display: flex; align-items: center; gap: 28px; height: 68px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); font: 800 19px var(--display); letter-spacing: .3px; }
.brand:hover { text-decoration: none; }
.logo { width: 34px; height: 34px; border-radius: 10px; background: var(--grad); display: grid; place-items: center; font: 900 15px var(--display); color: #fff; box-shadow: 0 6px 20px rgba(255, 45, 120, .35); }
.nav-links { display: flex; gap: 22px; margin-left: auto; font-size: 15px; }
.nav-links a { color: var(--muted); }
.nav-links a:hover, .nav-links a.on { color: var(--text); text-decoration: none; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px; height: 46px; padding: 0 22px; border-radius: 999px;
  font-weight: 700; font-size: 15px; color: #fff; background: rgba(255, 255, 255, .08); border: 1px solid var(--line); cursor: pointer; white-space: nowrap;
}
.btn:hover { text-decoration: none; background: rgba(255, 255, 255, .13); }
.btn.primary { background: var(--grad); border: 0; box-shadow: 0 10px 30px rgba(255, 45, 120, .3); }
.btn.primary:hover { filter: brightness(1.08); }
.btn.small { height: 38px; padding: 0 16px; font-size: 14px; }
.menu-toggle { display: none; margin-left: auto; background: none; border: 0; color: var(--text); font-size: 26px; cursor: pointer; }

/* ---------- 首頁 ---------- */
.hero { padding: 84px 0 40px; text-align: center; }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; padding: 6px 14px; border-radius: 999px; border: 1px solid var(--line); background: var(--card); color: var(--muted); font-size: 14px; }
.eyebrow b { color: var(--text); }
.hero h1 { font: 900 clamp(28px, 6.4vw, 72px)/1.18 var(--display); margin: 22px auto 18px; max-width: 900px; letter-spacing: -.5px; }
.hero p.lead { font-size: clamp(16px, 2vw, 20px); color: var(--muted); max-width: 720px; margin: 0 auto 30px; }
.hero .cta { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.hero .meta { display: flex; gap: 22px; justify-content: center; flex-wrap: wrap; margin-top: 22px; color: var(--muted); font-size: 14px; }
.hero .meta span::before { content: "✓ "; color: var(--cyan); }
.shot { margin: 56px auto 0; border-radius: 18px; overflow: hidden; border: 1px solid var(--line); box-shadow: 0 40px 120px rgba(139, 92, 246, .25), 0 0 0 1px rgba(255, 255, 255, .03); }

.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin: 64px auto 0; }
.stat { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; text-align: center; }
.stat b { display: block; font: 900 34px var(--display); }
.stat span { color: var(--muted); font-size: 14px; }

section { padding: 96px 0 0; }
.section-head { text-align: center; max-width: 760px; margin: 0 auto 48px; }
.section-head .kicker { color: var(--pink); font-weight: 800; letter-spacing: 2px; font-size: 13px; }
.section-head h2 { font: 900 clamp(28px, 4vw, 44px)/1.2 var(--display); margin: 10px 0 14px; }
.section-head p { color: var(--muted); margin: 0; }

.feature { display: grid; grid-template-columns: 1fr 1.1fr; gap: 56px; align-items: center; margin-bottom: 96px; }
.feature.flip .feature-text { order: 2; }
.feature-text .num { font: 900 15px var(--display); color: var(--violet); letter-spacing: 2px; }
.feature-text h3 { font: 900 clamp(26px, 3.2vw, 36px)/1.25 var(--display); margin: 8px 0 14px; }
.feature-text p { color: var(--muted); margin: 0 0 18px; }
.feature-text ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.feature-text li { padding-left: 28px; position: relative; }
.feature-text li::before { content: ""; position: absolute; left: 0; top: .55em; width: 16px; height: 16px; border-radius: 6px; background: var(--grad); opacity: .9; }
.feature-media { position: relative; }
.feature-media .frame { border-radius: 18px; overflow: hidden; border: 1px solid var(--line); background: var(--bg-2); box-shadow: 0 30px 80px rgba(0, 0, 0, .45); }
.feature-media .pair { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; align-items: end; }
/* 大圖＋角落小圖 */
.inset-wrap { padding: 0 0 48px 48px; }
.inset-wrap .inset { position: absolute; left: 0; bottom: 0; width: 38%; box-shadow: 0 24px 60px rgba(0, 0, 0, .6), 0 0 0 1px rgba(255, 255, 255, .08); }
.inset-wrap .inset.tall { width: 30%; }
.tag { position: absolute; top: -14px; right: 18px; padding: 6px 12px; border-radius: 999px; background: var(--grad); font-weight: 800; font-size: 13px; box-shadow: 0 8px 24px rgba(255, 45, 120, .35); }

.grid-cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.mini { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; transition: transform .2s, border-color .2s; }
.mini:hover { transform: translateY(-3px); border-color: rgba(255, 255, 255, .18); }
.mini .ico { font-size: 26px; }
.mini h4 { margin: 10px 0 6px; font-size: 17px; }
.mini p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.65; }

.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; counter-reset: step; }
.step { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 28px 24px; counter-increment: step; }
.step::before { content: counter(step, decimal-leading-zero); font: 900 40px var(--display); background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.step h4 { margin: 6px 0 8px; font-size: 19px; }
.step p { margin: 0; color: var(--muted); font-size: 15px; }

.cta-band { margin-top: 96px; padding: 56px 32px; border-radius: 28px; text-align: center; background: linear-gradient(120deg, rgba(255, 45, 120, .18), rgba(139, 92, 246, .18), rgba(34, 227, 240, .12)); border: 1px solid var(--line); }
.cta-band h2 { font: 900 clamp(26px, 3.6vw, 40px)/1.25 var(--display); margin: 0 0 12px; }
.cta-band p { color: var(--muted); margin: 0 0 24px; }

/* ---------- 方案 ---------- */
.plans { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.plan { position: relative; display: flex; flex-direction: column; background: var(--card-solid); border: 1px solid var(--line); border-radius: 24px; padding: 26px 22px; text-align: left; color: inherit; font: inherit; }
button.plan { cursor: pointer; }
.plan.hot { border: 0; background: linear-gradient(var(--card-solid), var(--card-solid)) padding-box, var(--grad) border-box; border: 2px solid transparent; }
.plan.on { box-shadow: 0 0 0 2px var(--cyan), 0 20px 50px rgba(34, 227, 240, .15); }
.plan .badge { position: absolute; top: -12px; left: 22px; padding: 4px 12px; border-radius: 999px; background: var(--grad); font-size: 12px; font-weight: 800; }
.plan h3 { margin: 0; font-size: 18px; }
.plan .price { font: 900 38px/1.1 var(--display); margin: 12px 0 2px; }
.plan .price small { font: 600 15px var(--font); color: var(--muted); }
.plan .sub { color: var(--muted); font-size: 14px; min-height: 2.6em; }
.plan ul { list-style: none; padding: 0; margin: 16px 0 0; display: grid; gap: 8px; font-size: 14px; }
.plan li::before { content: "✓"; color: var(--cyan); font-weight: 900; margin-right: 8px; }
.plan li.no { color: var(--muted); }
.plan li.no::before { content: "–"; color: var(--muted); }
.save { display: inline-block; margin-left: 6px; padding: 1px 8px; border-radius: 999px; background: rgba(255, 209, 102, .15); color: var(--gold); font-size: 12px; font-weight: 800; }

.buy { max-width: 620px; margin: 40px auto 0; background: var(--card-solid); border: 1px solid var(--line); border-radius: 24px; padding: 28px; }
.buy h3 { margin: 0 0 4px; }
.buy label { display: block; font-size: 14px; margin: 16px 0 6px; color: var(--muted); }
.buy input { width: 100%; height: 50px; padding: 0 16px; border-radius: 14px; border: 1px solid var(--line); background: var(--bg-2); color: var(--text); font: inherit; }
.buy input:focus { outline: 2px solid var(--violet); border-color: transparent; }
.buy .btn { width: 100%; margin-top: 22px; height: 54px; font-size: 17px; }
.buy .err { color: #ff8aa8; min-height: 1.6em; margin-top: 10px; font-size: 14px; }
.buy .pay-note { color: var(--muted); font-size: 13px; margin-top: 8px; }

table.compare { width: 100%; border-collapse: collapse; margin-top: 18px; font-size: 15px; }
.compare th, .compare td { padding: 14px 12px; border-bottom: 1px solid var(--line); text-align: center; }
.compare th:first-child, .compare td:first-child { text-align: left; color: var(--muted); }
.compare thead th { font-size: 14px; color: var(--muted); }
.compare .y { color: var(--cyan); font-weight: 800; }

/* ---------- 內文頁（說明書、常見問題、條款） ---------- */
.doc { display: grid; grid-template-columns: 220px 1fr; gap: 48px; padding: 56px 0 0; }
.doc nav { position: sticky; top: 92px; align-self: start; display: grid; gap: 4px; font-size: 14px; }
.doc nav a { color: var(--muted); padding: 6px 12px; border-radius: 10px; }
.doc nav a:hover { background: var(--card); color: var(--text); text-decoration: none; }
.doc article { max-width: 760px; }
.doc h1 { font: 900 clamp(30px, 4vw, 42px)/1.2 var(--display); margin: 0 0 12px; }
.doc h2 { font: 800 24px/1.35 var(--display); margin: 48px 0 12px; padding-top: 12px; }
.doc h3 { font-size: 18px; margin: 28px 0 8px; }
.doc p, .doc li { color: #d6d4e6; }
.doc ol, .doc ul { padding-left: 22px; }
.doc li { margin: 6px 0; }
.doc code { background: rgba(255, 255, 255, .08); padding: 2px 7px; border-radius: 6px; font-size: .92em; }
.doc .note { background: var(--card); border: 1px solid var(--line); border-left: 4px solid var(--violet); border-radius: 12px; padding: 14px 18px; margin: 18px 0; }
.doc .warn { border-left-color: var(--gold); }
.doc figure { margin: 18px 0; border-radius: 14px; overflow: hidden; border: 1px solid var(--line); }
.doc .updated { color: var(--muted); font-size: 14px; }
details.qa { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 4px 20px; margin: 10px 0; }
details.qa summary { cursor: pointer; padding: 14px 0; font-weight: 700; list-style: none; }
details.qa summary::after { content: "＋"; float: right; color: var(--muted); }
details.qa[open] summary::after { content: "－"; }
details.qa p { margin: 0 0 16px; }

/* ---------- 頁尾 ---------- */
footer { margin-top: 110px; border-top: 1px solid var(--line); padding: 48px 0 40px; color: var(--muted); font-size: 14px; }
footer .cols { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 28px; }
footer h5 { color: var(--text); margin: 0 0 10px; font-size: 14px; }
footer a { color: var(--muted); display: block; margin: 6px 0; }
footer a:hover { color: var(--text); }
footer .legal { margin-top: 34px; padding-top: 20px; border-top: 1px solid var(--line); font-size: 13px; }

/* 進場動畫 */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1; transform: none; transition: none; } html { scroll-behavior: auto; } }

/* ---------- 手機 ---------- */
@media (max-width: 900px) {
  .nav-links { display: none; position: absolute; top: 68px; left: 0; right: 0; flex-direction: column; gap: 0; background: var(--bg-2); border-bottom: 1px solid var(--line); padding: 8px 16px 16px; }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 10px 0; }
  .menu-toggle { display: block; }
  .nav .btn.primary { display: none; }
  .stats, .grid-cards, .plans { grid-template-columns: 1fr 1fr; }
  .feature { grid-template-columns: 1fr; gap: 28px; margin-bottom: 72px; }
  .feature.flip .feature-text { order: 0; }
  .steps { grid-template-columns: 1fr; }
  .doc { grid-template-columns: 1fr; }
  .doc nav { position: static; display: flex; flex-wrap: wrap; }
  footer .cols { grid-template-columns: 1fr 1fr; }
  .compare { font-size: 13px; }
}
@media (max-width: 520px) {
  .hero h1 br { display: none; }
  .hero h1 .grad-text { display: block; }
  .inset-wrap { padding: 0 0 36px 24px; }
  .stats, .grid-cards, .plans { grid-template-columns: 1fr; }
  .feature-media .pair { grid-template-columns: 1fr; }
}