/* 双语幕 Twinsub · 站点样式：克制、工具感，深浅色都可读 */
:root {
  --bg: #F5F4F0; --bg-2: #ECEAE4; --line: #D9D6CC;
  --ink: #16181B; --ink-2: #454A50; --ink-soft: #7A7F85;
  --accent: #0E7C66; --accent-ink: #0A5C4C;
  --screen: #1A1D21; --cue-zh: #F4F5F6; --cue-en: #A9B0B7;
  --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #141517; --bg-2: #1C1E21; --line: #2E3237; --ink: #ECEDEE; --ink-2: #B4B9BE; --ink-soft: #7F858B; --accent: #3FBF9F; --accent-ink: #5FD3B6; --screen: #0B0C0E; }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; overflow-x: clip; }
body { margin: 0; background: var(--bg); color: var(--ink); font-family: var(--sans); line-height: 1.75; -webkit-font-smoothing: antialiased; overflow-x: clip; }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent-ink); text-underline-offset: 3px; }
h1, h2, h3 { line-height: 1.3; margin: 0; font-weight: 700; }
code { font-family: var(--mono); font-size: .92em; background: var(--bg-2); padding: 1px 6px; border-radius: 5px; overflow-wrap: anywhere; }
.wrap { max-width: 1040px; margin: 0 auto; padding: 0 22px; }

.nav { display: flex; align-items: center; justify-content: space-between; padding-top: 18px; padding-bottom: 18px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); font-weight: 700; font-size: 18px; letter-spacing: .04em; }
.brand img { width: 30px; height: 30px; border-radius: 7px; }
.brand small { font-weight: 400; font-size: 12px; color: var(--ink-soft); letter-spacing: .1em; }
.nav-links { display: flex; gap: 20px; font-size: 14px; }
.nav-links a { text-decoration: none; color: var(--ink-2); }
.nav-links a:hover { color: var(--accent-ink); }

.hero { display: grid; gap: 30px; padding: 22px 0 52px; }
.eyebrow { display: inline-flex; align-items: center; gap: 9px; font-size: 13px; letter-spacing: .12em; color: var(--ink-soft); margin: 0 0 12px; }
.eyebrow i { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); display: inline-block; }
.hero h1 { font-size: clamp(40px, 11vw, 60px); letter-spacing: .06em; line-height: 1.1; }
.lede { font-size: 18px; color: var(--ink-2); margin: 16px 0 0; max-width: 26em; }
.facts { list-style: none; margin: 20px 0 0; padding: 0; display: grid; gap: 6px; font-size: 15px; color: var(--ink-2); }
.facts li { padding-left: 18px; position: relative; }
.facts li::before { content: ""; position: absolute; left: 0; top: .78em; width: 8px; height: 2px; background: var(--accent); }
.soon { display: inline-flex; flex-direction: column; margin-top: 24px; padding: 10px 18px 11px; border: 1px solid var(--ink); border-radius: 10px; line-height: 1.4; }
.soon b { font-size: 16px; }
.soon span { font-size: 12px; color: var(--ink-soft); }
.mail-line { font-size: 14px; color: var(--ink-soft); margin: 14px 0 0; }

/* 视频画面示意：纯 CSS 合成，不含任何真实画面 */
.player { margin: 0; }
.screen { position: relative; aspect-ratio: 16 / 9; border-radius: 12px 12px 0 0; overflow: hidden; background: var(--screen);
  background-image: linear-gradient(135deg, rgba(255,255,255,.03) 0 50%, rgba(255,255,255,0) 50%), radial-gradient(ellipse at 30% 25%, rgba(14,124,102,.28), rgba(14,124,102,0) 60%); }
.mark { position: absolute; left: 16px; top: 14px; display: flex; gap: 6px; }
.mark i { width: 9px; height: 9px; border-radius: 50%; background: rgba(255,255,255,.16); }
.subs { position: absolute; left: 0; right: 0; bottom: 7%; display: grid; justify-items: center; padding: 0 5%; min-height: 4.4em; }
.cue { grid-area: 1 / 1; display: none; text-align: center; }
.cue.on { display: block; }
.cue .zh { display: block; color: var(--cue-zh); font-size: clamp(14px, 3.6vw, 24px); font-weight: 600; line-height: 1.4; text-shadow: 0 1px 3px rgba(0,0,0,.6); }
.cue .en { display: block; color: var(--cue-en); font-size: clamp(11px, 2.7vw, 17px); line-height: 1.35; margin-top: 3px; text-shadow: 0 1px 3px rgba(0,0,0,.6); }
.bar { display: flex; align-items: center; gap: 12px; background: #24282D; border-radius: 0 0 12px 12px; padding: 9px 14px; color: #A9B0B7; font: 12px var(--mono); }
.play { width: 0; height: 0; border-left: 9px solid #D5D9DD; border-top: 6px solid transparent; border-bottom: 6px solid transparent; }
.track { flex: 1; height: 3px; background: rgba(255,255,255,.14); border-radius: 2px; overflow: hidden; }
.track b { display: block; height: 100%; width: 16%; background: var(--accent); transition: width .4s; }
figcaption { font-size: 12px; color: var(--ink-soft); margin-top: 8px; }

.block { padding: 44px 0; border-top: 1px solid var(--line); }
.block h2, .doc h2 { font-size: 24px; letter-spacing: .02em; }
.block .sub, .doc .sub { color: var(--ink-soft); font-size: 14px; margin: 8px 0 0; }
.srt { margin: 20px 0 0; padding: 18px 20px; background: var(--bg-2); border: 1px solid var(--line); border-radius: 10px; font: 13px/1.65 var(--mono); color: var(--ink-2); white-space: pre-wrap; overflow-wrap: anywhere; }
.steps { list-style: none; counter-reset: s; margin: 22px 0 0; padding: 0; display: grid; gap: 14px; }
.steps li { counter-increment: s; display: grid; grid-template-columns: 34px 1fr; column-gap: 12px; }
.steps li::before { content: counter(s); grid-row: 1 / 3; width: 28px; height: 28px; border: 1px solid var(--accent); color: var(--accent-ink); border-radius: 50%; display: grid; place-items: center; font: 600 14px var(--mono); }
.steps b { font-size: 17px; }
.steps span { color: var(--ink-2); font-size: 15px; }
.cards { display: grid; gap: 14px; margin-top: 22px; }
.cards > div { border: 1px solid var(--line); border-radius: 12px; padding: 18px 20px; background: var(--bg-2); }
.cards h3 { font-size: 17px; }
.cards p { margin: 6px 0 0; color: var(--ink-2); font-size: 15px; }
.price { display: grid; gap: 12px; margin-top: 22px; }
.price > div { border: 1px solid var(--line); border-radius: 12px; padding: 16px 20px; display: grid; gap: 2px; }
.price > div:last-child { border-color: var(--accent); }
.price b { font-size: 22px; }
.price span { color: var(--ink-2); font-size: 14px; }
.note { color: var(--ink-soft); font-size: 14px; margin: 14px 0 0; }
.final p { color: var(--ink-2); margin: 8px 0 0; }

.doc { padding: 20px 0 50px; max-width: 720px; }
.doc h1 { font-size: 34px; }
.doc h2 { margin-top: 30px; font-size: 20px; }
.doc p { color: var(--ink-2); margin: 10px 0 0; }
.faq { margin-top: 22px; border-top: 1px solid var(--line); }
details { border-bottom: 1px solid var(--line); padding: 14px 0; }
summary { cursor: pointer; font-weight: 600; font-size: 16px; list-style: none; position: relative; padding-right: 26px; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; position: absolute; right: 2px; top: 0; font: 400 20px var(--mono); color: var(--ink-soft); }
details[open] summary::after { content: "−"; }

.foot { padding-top: 26px; padding-bottom: 40px; border-top: 1px solid var(--line); color: var(--ink-soft); font-size: 13px; }
.foot-links { display: flex; flex-wrap: wrap; gap: 6px 20px; }
.foot-links a { color: var(--ink-2); }
.foot p { margin: 12px 0 0; }

@media (min-width: 820px) {
  .hero { grid-template-columns: 1fr 1.08fr; align-items: center; gap: 44px; padding: 40px 0 70px; }
  .cards { grid-template-columns: repeat(3, 1fr); }
  .price { grid-template-columns: 1fr 1fr; }
  .steps { grid-template-columns: repeat(3, 1fr); }
}

/* 内容页（指南 / 用途 / 对比） */
.art { max-width: 760px; }
.art h1 { font-size: clamp(26px, 6vw, 34px); }
.art .lede { font-size: 17px; margin: 14px 0 0; max-width: none; }
.art h2 { margin-top: 36px; font-size: 22px; }
.art h3 { margin-top: 22px; font-size: 18px; }
.art p, .art li { color: var(--ink-2); }
.art ul { padding-left: 1.3em; margin: 10px 0 0; }
.art li { margin: 6px 0; }
.art .steps { margin-top: 16px; }
.art .steps li { margin: 0; }
.crumbs { font-size: 13px; color: var(--ink-soft); margin-bottom: 14px; }
.crumbs a { color: var(--ink-soft); }
.fig { margin: 22px 0 0; }
.fig img { width: 100%; height: auto; border-radius: 12px; }
.tbl { margin-top: 16px; overflow-x: auto; border: 1px solid var(--line); border-radius: 10px; }
.tbl table { border-collapse: collapse; width: 100%; min-width: 560px; font-size: 14px; }
.tbl th, .tbl td { text-align: left; vertical-align: top; padding: 10px 12px; border-bottom: 1px solid var(--line); color: var(--ink-2); line-height: 1.6; }
.tbl thead th { background: var(--bg-2); color: var(--ink); font-size: 14px; }
.tbl tbody th { color: var(--ink); font-weight: 600; white-space: nowrap; }
.tbl tbody th.n { font-weight: 400; color: var(--ink-2); white-space: normal; }
.tbl tr:last-child th, .tbl tr:last-child td { border-bottom: 0; }
.cta-box { margin-top: 30px; padding: 16px 20px; border: 1px solid var(--accent); border-radius: 12px; display: grid; gap: 4px; }
.cta-box span { color: var(--ink-2); font-size: 14px; }
.related { margin-top: 40px; padding-top: 6px; border-top: 1px solid var(--line); }
.related h2 { font-size: 18px; margin-top: 18px; }
.src { font-size: 13px; overflow-wrap: anywhere; }
.linklist { list-style: none; padding: 0; margin: 16px 0 0; display: grid; gap: 4px; }
.linklist li { display: flex; justify-content: space-between; gap: 12px; padding: 10px 0; border-bottom: 1px solid var(--line); }
.linklist small { color: var(--ink-soft); white-space: nowrap; }
.cardlist { list-style: none; padding: 0 !important; display: grid; gap: 12px; }
.cardlist a { display: block; text-decoration: none; border: 1px solid var(--line); border-radius: 12px; padding: 14px 18px; background: var(--bg-2); }
.cardlist b { display: block; color: var(--ink); font-size: 16px; }
.cardlist span { display: block; color: var(--ink-2); font-size: 14px; margin-top: 4px; }
.foot-pages { line-height: 2; }
.foot-pages a { color: var(--ink-soft); }
.shot { width: 100%; border-radius: 12px; }
.block .faq p { color: var(--ink-2); margin: 10px 0 0; font-size: 15px; }