:root {
  --paper: #f7f3ea;
  --paper-deep: #eee7da;
  --ink: #172135;
  --muted: #687081;
  --line: rgba(23, 33, 53, 0.13);
  --blue: #2357d9;
  --blue-deep: #173da4;
  --blue-pale: #e8efff;
  --red: #d94a3d;
  --green: #177c61;
  --white: #fffdf8;
  --shadow: 0 28px 80px rgba(38, 40, 47, 0.13);
  --radius: 24px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: radial-gradient(circle at 8% 8%, rgba(255, 255, 255, 0.9), transparent 26rem), var(--paper);
  font-family: "Segoe UI", "Noto Sans TC", system-ui, sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
body.nav-open { overflow: hidden; }
a { color: inherit; text-decoration: none; }
button { color: inherit; font: inherit; }
img { max-width: 100%; }
.wrap { width: min(1120px, calc(100% - 48px)); margin-inline: auto; }
.eyebrow { color: var(--blue); font-size: 12px; font-weight: 800; letter-spacing: 0.16em; text-transform: uppercase; }
h1, h2, h3, p { margin-top: 0; }
h1, h2, h3 { line-height: 1.15; }
h1, h2 { font-family: Georgia, "Noto Serif TC", serif; letter-spacing: -0.035em; }
.skip-link { position: fixed; left: 16px; top: -80px; z-index: 100; padding: 10px 14px; border-radius: 8px; background: var(--ink); color: white; }
.skip-link:focus { top: 16px; }

.site-header { position: relative; z-index: 20; }
.nav { min-height: 76px; display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--line); }
.brand { display: flex; align-items: center; gap: 12px; font-weight: 800; }
.brand-mark { width: 36px; height: 36px; border-radius: 11px; display: grid; place-items: center; color: white; background: var(--blue); box-shadow: 0 8px 22px rgba(35, 87, 217, 0.25); font-size: 13px; }
.nav-links { display: flex; align-items: center; gap: 28px; font-size: 14px; color: #4e5666; }
.nav-links a:hover, .footer-links a:hover, .brand-footer:hover { color: var(--blue); }
.nav-download { color: white !important; background: var(--ink); padding: 10px 17px; border-radius: 999px; font-weight: 700; }
.menu-toggle { display: none; width: 44px; height: 44px; border: 1px solid var(--line); border-radius: 11px; background: rgba(255, 255, 255, 0.65); cursor: pointer; }
.menu-toggle span, .menu-toggle::before, .menu-toggle::after { content: ""; display: block; width: 18px; height: 2px; margin: 4px auto; background: var(--ink); transition: transform 0.2s ease, opacity 0.2s ease; }
.menu-toggle[aria-expanded="true"] span { opacity: 0; }
.menu-toggle[aria-expanded="true"]::before { transform: translateY(6px) rotate(45deg); }
.menu-toggle[aria-expanded="true"]::after { transform: translateY(-6px) rotate(-45deg); }

.hero { padding: 92px 0 54px; text-align: center; }
.kicker { display: inline-flex; align-items: center; gap: 8px; padding: 7px 12px; border: 1px solid rgba(35, 87, 217, 0.2); border-radius: 999px; background: rgba(255, 255, 255, 0.55); color: var(--blue-deep); font-size: 13px; font-weight: 700; }
.kicker-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--green); }
.hero h1 { max-width: 900px; margin: 24px auto 22px; font-size: clamp(45px, 7vw, 80px); font-weight: 600; }
.hero h1 em { color: var(--blue); font-style: normal; }
.hero-copy { max-width: 740px; margin: 0 auto 31px; color: var(--muted); font-size: 19px; }
.hero-actions { display: flex; justify-content: center; gap: 12px; flex-wrap: wrap; }
.button { min-height: 52px; padding: 0 24px; border: 1px solid var(--line); border-radius: 13px; display: inline-flex; align-items: center; justify-content: center; gap: 10px; font-weight: 800; cursor: pointer; }
.button:focus-visible, a:focus-visible, button:focus-visible { outline: 3px solid rgba(35, 87, 217, 0.42); outline-offset: 3px; }
.button-primary { border-color: var(--blue); background: var(--blue); color: white; box-shadow: 0 13px 32px rgba(35, 87, 217, 0.22); }
.button-primary:hover { background: var(--blue-deep); }
.button-secondary { background: rgba(255, 255, 255, 0.62); }
.trust-row { margin: 20px auto 0; display: flex; justify-content: center; gap: 20px; flex-wrap: wrap; color: #747b89; font-size: 13px; }
.trust-row span::before { content: ""; width: 6px; height: 6px; margin-right: 7px; border-radius: 50%; display: inline-block; vertical-align: 2px; background: var(--green); }

.product-stage { padding: 24px 0 94px; }
.window { overflow: hidden; border: 1px solid rgba(23, 33, 53, 0.12); border-radius: 26px; background: #f4f6fa; box-shadow: var(--shadow); transform: perspective(1200px) rotateX(0.8deg); }
.window-top { height: 50px; padding: 0 18px; display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid #e6e9f0; background: white; color: #727a8b; font-size: 12px; }
.window-dots { display: flex; gap: 7px; }
.window-dots i { width: 9px; height: 9px; border-radius: 50%; background: #d5dae5; }
.desktop { min-height: 530px; display: grid; grid-template-columns: 184px 1fr; }
.side { padding: 23px 14px; border-right: 1px solid #e5e9f0; background: white; }
.side-logo { padding: 0 9px 22px; display: flex; align-items: center; gap: 9px; font-size: 13px; font-weight: 800; }
.side-logo b { width: 28px; height: 28px; border-radius: 9px; display: grid; place-items: center; background: var(--blue); color: white; font-size: 10px; }
.menu-item { padding: 10px 12px; margin-bottom: 4px; border-radius: 9px; color: #6c7381; font-size: 12px; }
.menu-item.active { background: var(--blue-pale); color: var(--blue); font-weight: 800; }
.desktop-main { padding: 28px 30px 32px; }
.app-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 20px; }
.app-head h3 { margin-bottom: 6px; font-size: 25px; }
.app-head p { color: #7a8290; font-size: 12px; }
.status-chip, .row-chip { padding: 7px 10px; border-radius: 999px; background: #e8f6f1; color: var(--green); font-size: 11px; font-weight: 800; }
.summary-grid { margin: 18px 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; }
.summary-card { padding: 14px; border: 1px solid #e4e8ef; border-radius: 14px; background: white; }
.summary-card small { color: #858c98; font-size: 10px; }
.summary-card strong { margin-top: 3px; display: block; font-family: Georgia, serif; font-size: 24px; }
.queue { overflow: hidden; border: 1px solid #e4e8ef; border-radius: 16px; background: white; }
.queue-head, .queue-row { display: grid; grid-template-columns: 1.7fr 0.8fr 0.8fr 0.8fr; gap: 12px; align-items: center; }
.queue-head { padding: 11px 16px; background: #f8f9fb; color: #878e9b; font-size: 10px; letter-spacing: 0.07em; text-transform: uppercase; }
.queue-row { padding: 14px 16px; border-top: 1px solid #eef0f4; font-size: 11px; }
.video-name { display: flex; align-items: center; gap: 10px; font-weight: 700; }
.thumb { width: 44px; aspect-ratio: 16 / 10; position: relative; border-radius: 6px; background: linear-gradient(135deg, #2d60d5, #8baaff); }
.thumb::after { content: ""; position: absolute; left: 18px; top: 9px; border-left: 7px solid white; border-top: 5px solid transparent; border-bottom: 5px solid transparent; }
.bar { width: 90%; height: 6px; overflow: hidden; border-radius: 10px; background: #e7eaf0; }
.bar span { height: 100%; display: block; border-radius: inherit; background: var(--blue); }
.row-chip { justify-self: start; padding: 5px 8px; font-size: 10px; }
.row-chip.wait { background: #fff4cf; color: #8b6a18; }
.result-link { color: var(--blue); font-weight: 700; }
.stage-caption { margin-top: 24px; color: #747c8a; text-align: center; font-size: 13px; }

.problem, .safe-mode, .workflow { padding: 105px 0; border-top: 1px solid var(--line); }
.split-title { display: grid; grid-template-columns: 0.8fr 1.2fr; gap: 70px; align-items: start; }
.split-title h2, .section-head h2, .workflow h2 { margin-bottom: 0; font-size: clamp(38px, 5vw, 62px); }
.split-copy { color: var(--muted); font-size: 18px; }
.split-copy strong { color: var(--ink); }
.manual-flow { margin-top: 54px; display: grid; grid-template-columns: repeat(5, 1fr); gap: 10px; }
.manual-step { min-height: 140px; padding: 19px; border: 1px solid var(--line); border-radius: 17px; background: rgba(255, 255, 255, 0.42); }
.manual-step b { margin-bottom: 30px; display: block; color: var(--red); font-size: 12px; }
.manual-step span { font-weight: 800; }

.advantages { padding: 106px 0; background: var(--ink); color: white; }
.advantages .eyebrow { color: #9fbcff; }
.section-head { margin-bottom: 46px; display: flex; justify-content: space-between; align-items: end; gap: 50px; }
.section-head h2 { max-width: 680px; }
.section-head p { max-width: 360px; margin-bottom: 5px; color: #aeb7c8; }
.advantage-grid { display: grid; grid-template-columns: repeat(12, 1fr); gap: 14px; }
.adv-card { min-height: 270px; padding: 28px; grid-column: span 4; border: 1px solid rgba(255, 255, 255, 0.12); border-radius: 19px; background: rgba(255, 255, 255, 0.045); }
.adv-card.wide { min-height: 235px; grid-column: span 6; }
.adv-number { display: flex; justify-content: space-between; color: #8e9ab0; font-size: 12px; }
.adv-icon { width: 42px; height: 42px; border: 1px solid rgba(255, 255, 255, 0.16); border-radius: 12px; display: grid; place-items: center; color: #b9cdff; font-weight: 800; }
.adv-card h3 { margin: 46px 0 12px; font-family: Georgia, "Noto Serif TC", serif; font-size: 24px; }
.adv-card.wide h3 { margin-top: 29px; }
.adv-card p { margin-bottom: 0; color: #acb4c3; font-size: 14px; }

.mode-card { overflow: hidden; display: grid; grid-template-columns: 1fr 1fr; border: 1px solid var(--line); border-radius: 25px; background: var(--white); }
.mode-copy { padding: 60px; }
.mode-copy h2 { margin: 13px 0 22px; font-size: clamp(38px, 4.7vw, 58px); }
.mode-copy p { color: var(--muted); }
.mode-points { margin-top: 28px; display: grid; gap: 15px; }
.mode-point { display: grid; grid-template-columns: 26px 1fr; gap: 11px; }
.mode-point i { width: 24px; height: 24px; border-radius: 50%; display: grid; place-items: center; background: #e9f6f1; color: var(--green); font-size: 12px; font-style: normal; font-weight: 900; }
.mode-visual { padding: 44px; display: flex; flex-direction: column; justify-content: center; background: var(--blue-pale); }
.mode-panel { padding: 24px; border: 1px solid #d8e1f8; border-radius: 17px; background: white; box-shadow: 0 20px 60px rgba(35, 87, 217, 0.12); }
.mode-panel + .mode-panel { margin-top: 14px; }
.mode-panel small { color: #7a8497; }
.mode-panel h3 { margin: 6px 0 10px; }
.mode-panel p { margin-bottom: 0; color: #657086; font-size: 13px; }

.workflow h2 { max-width: 720px; }
.steps { margin-top: 54px; border-top: 1px solid var(--line); }
.step { padding: 29px 0; display: grid; grid-template-columns: 80px 1fr 1.1fr; gap: 30px; align-items: center; border-bottom: 1px solid var(--line); }
.step-num { color: var(--blue); font-family: Georgia, serif; font-size: 24px; }
.step h3 { margin: 0; font-size: 21px; }
.step p { margin: 0; color: var(--muted); font-size: 14px; }

.download { padding: 40px 0 108px; }
.download-card { overflow: hidden; position: relative; padding: 58px; border-radius: 27px; background: var(--blue); color: white; box-shadow: 0 26px 70px rgba(35, 87, 217, 0.22); }
.download-card::after { content: ""; width: 380px; height: 380px; position: absolute; right: -100px; top: -170px; border: 70px solid rgba(255, 255, 255, 0.08); border-radius: 50%; }
.download-card h2 { max-width: 720px; margin: 13px 0 20px; font-size: clamp(38px, 5vw, 58px); }
.download-card > p { max-width: 650px; color: #d8e3ff; }
.release-box { position: relative; z-index: 1; margin-top: 32px; display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 12px; }
.release-main, .release-meta { padding: 20px; border: 1px solid rgba(255, 255, 255, 0.2); border-radius: 16px; background: rgba(255, 255, 255, 0.1); backdrop-filter: blur(10px); }
.release-main strong { margin-bottom: 5px; display: block; font-size: 18px; overflow-wrap: anywhere; }
.release-main small, .release-meta small { color: #d7e1fa; }
.release-meta code { margin-top: 6px; display: block; color: white; font-size: 10px; overflow-wrap: anywhere; }
.release-notice { position: relative; z-index: 1; margin: 18px 0 0; padding: 12px 15px; border-radius: 11px; background: rgba(9, 27, 75, 0.26); color: #e6edff; font-size: 13px; }
.download-actions { margin-top: 18px; display: flex; gap: 10px; flex-wrap: wrap; }
.download-actions .button-primary { border-color: white; background: white; color: var(--blue); box-shadow: none; }
.download-actions .button-secondary { border-color: rgba(255, 255, 255, 0.35); background: transparent; color: white; }

.site-footer { padding: 32px 0 46px; border-top: 1px solid var(--line); color: #727988; font-size: 13px; }
.footer-row { display: flex; justify-content: space-between; align-items: center; gap: 25px; }
.brand-footer { color: var(--ink); font-weight: 800; }
.footer-links { display: flex; gap: 22px; }

.legal-hero { padding: 80px 0 42px; }
.legal-hero h1 { max-width: 820px; margin: 16px 0 22px; font-size: clamp(44px, 7vw, 76px); }
.legal-hero p { max-width: 720px; color: var(--muted); font-size: 18px; }
.legal-shell { padding-bottom: 100px; display: grid; grid-template-columns: 230px minmax(0, 720px); gap: 70px; align-items: start; }
.legal-nav { position: sticky; top: 24px; padding: 19px; border: 1px solid var(--line); border-radius: 15px; background: rgba(255, 255, 255, 0.55); }
.legal-nav strong { display: block; margin-bottom: 10px; }
.legal-nav a { display: block; padding: 7px 0; color: var(--muted); font-size: 14px; }
.legal-content section { padding: 0 0 35px; margin-bottom: 35px; border-bottom: 1px solid var(--line); scroll-margin-top: 24px; }
.legal-content section:last-child { border-bottom: 0; }
.legal-content h2 { font-size: 31px; }
.legal-content h3 { margin-top: 28px; font-size: 19px; }
.legal-content p, .legal-content li { color: #535c6d; }
.legal-content li + li { margin-top: 8px; }
.legal-meta { margin-bottom: 36px; padding: 15px 18px; border-left: 4px solid var(--blue); background: var(--blue-pale); color: #45516a; font-size: 14px; }
.hash-block { padding: 14px; border-radius: 10px; display: block; background: #182237; color: #d9e4ff; font-size: 12px; overflow-wrap: anywhere; }
.update-card { margin: 25px 0; padding: 25px; border: 1px solid var(--line); border-radius: 18px; background: var(--white); }
.update-card h3 { margin-bottom: 8px; }

@media (max-width: 850px) {
  .menu-toggle { display: block; }
  .nav-links { display: none; }
  .nav-links.open { width: calc(100% - 28px); padding: 14px; position: absolute; left: 14px; top: 68px; display: grid; gap: 4px; border: 1px solid var(--line); border-radius: 14px; background: var(--white); box-shadow: var(--shadow); }
  .nav-links.open a { padding: 10px 12px; }
  .nav-download { text-align: center; }
  .desktop { grid-template-columns: 1fr; }
  .side { display: none; }
  .summary-grid { grid-template-columns: repeat(2, 1fr); }
  .split-title, .mode-card, .release-box, .legal-shell { grid-template-columns: 1fr; }
  .manual-flow { grid-template-columns: repeat(2, 1fr); }
  .adv-card, .adv-card.wide { grid-column: span 6; }
  .section-head { display: block; }
  .section-head p { margin-top: 22px; }
  .step { grid-template-columns: 55px 1fr; }
  .step p { grid-column: 2; }
  .legal-shell { gap: 25px; }
  .legal-nav { position: static; }
}

@media (max-width: 560px) {
  .wrap { width: min(100% - 28px, 1120px); }
  .nav { min-height: 64px; }
  .brand span { font-size: 14px; }
  .hero { padding: 64px 0 30px; }
  .hero h1 { font-size: 45px; }
  .hero-copy { font-size: 16px; }
  .button { width: 100%; }
  .trust-row { display: grid; gap: 5px; text-align: left; }
  .product-stage { padding-bottom: 70px; }
  .window { border-radius: 18px; transform: none; }
  .window-top span:nth-child(2) { display: none; }
  .desktop-main { padding: 20px 15px 24px; }
  .app-head { display: block; }
  .status-chip { margin-bottom: 12px; display: inline-block; }
  .summary-grid { grid-template-columns: 1fr 1fr; }
  .summary-card strong { font-size: 19px; }
  .queue-head { display: none; }
  .queue-row { grid-template-columns: 1fr; }
  .queue-row > *:not(.video-name):not(.result-link) { display: none; }
  .problem, .advantages, .safe-mode, .workflow { padding: 75px 0; }
  .split-title { gap: 22px; }
  .manual-flow { grid-template-columns: 1fr; }
  .manual-step { min-height: auto; }
  .manual-step b { margin-bottom: 12px; }
  .advantage-grid { display: block; }
  .adv-card, .adv-card.wide { min-height: auto; margin-bottom: 12px; }
  .adv-card h3, .adv-card.wide h3 { margin-top: 28px; }
  .mode-copy, .mode-visual { padding: 30px 23px; }
  .step { grid-template-columns: 42px 1fr; gap: 12px; }
  .download-card { padding: 36px 23px; }
  .footer-row { display: block; }
  .footer-links { margin-top: 14px; display: grid; grid-template-columns: 1fr 1fr; gap: 10px 16px; }
  .legal-hero { padding-top: 58px; }
  .legal-hero h1 { font-size: 44px; }
  .legal-content h2 { font-size: 27px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}