@font-face {
  font-family: "Geist";
  src: url("./assets/fonts/geist-sans.woff2") format("woff2");
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
}

@font-face {
  font-family: "Geist Mono";
  src: url("./assets/fonts/geist-mono.woff2") format("woff2");
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
}

:root {
  --ink: #101010;
  --blue: #0099ff;
  --white: #ffffff;
  --paper: #f4f4f4;
  --graphite: #242424;
  --slate: #6b7280;
  --stone: #898989;
  --silver: #e5e7eb;
  --font-heading: "Geist", "Microsoft YaHei UI", ui-sans-serif, system-ui, sans-serif;
  --font-ui: "Geist", "Microsoft YaHei UI", ui-sans-serif, system-ui, sans-serif;
  --font-mono: "Geist Mono", Consolas, monospace;
  --radius-card: 12px;
  --radius-input: 8px;
  --radius-pill: 9999px;
  --shadow-card: rgba(36, 36, 36, 0.05) 0 4px 8px 0;
  --shadow-hover: rgba(36, 36, 36, 0.16) 0 14px 34px -8px, rgba(36, 36, 36, 0.08) 0 6px 16px 0;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; scroll-padding-top: 88px; background: var(--paper); }
body { margin: 0; overflow-x: hidden; background: var(--paper); color: var(--graphite); font-family: var(--font-ui); font-size: 16px; line-height: 1.5; letter-spacing: -0.19px; }
button, a { font: inherit; }
button { cursor: pointer; }
a { color: inherit; text-decoration: none; }
button:focus-visible, a:focus-visible { outline: 2px solid var(--ink); outline-offset: 3px; }

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  width: calc(100% - 48px);
  max-width: 1200px;
  height: 72px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 28px;
  background: rgba(244, 244, 244, 0.94);
  backdrop-filter: blur(18px);
}
.topbar::after { content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 1px; background: var(--silver); }
.brand { display: flex; align-items: center; gap: 10px; white-space: nowrap; font-size: 15px; font-weight: 600; letter-spacing: -0.1px; }
.brand img { width: 34px; height: 34px; object-fit: contain; }
.nav-links { display: flex; align-items: center; gap: 26px; margin-left: auto; }
.nav-links a { color: var(--graphite); font-size: 15px; font-weight: 500; }
.nav-links a:hover { color: var(--blue); }
.nav-download { min-height: 40px; padding: 0 18px; border: 0; border-radius: var(--radius-input); background: var(--ink); color: var(--white); font-size: 15px; font-weight: 500; }
.nav-download:hover { background: var(--graphite); }
.menu-button { display: none; width: 38px; height: 38px; padding: 0; border: 0; border-radius: var(--radius-input); background: var(--white); box-shadow: var(--shadow-card); }
.menu-button span { display: block; width: 16px; height: 1px; margin: 5px auto; background: var(--ink); }

.hero {
  width: calc(100% - 48px);
  max-width: 1200px;
  min-height: 680px;
  margin: 0 auto;
  padding: 72px 0 88px;
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(480px, 1.08fr);
  align-items: center;
  gap: 64px;
}
.hero-copy { padding-right: 12px; }
.stamp { display: inline-flex; align-items: center; min-height: 30px; padding: 5px 14px; border-radius: var(--radius-pill); background: var(--white); color: var(--graphite); font-size: 14px; line-height: 1.4; font-weight: 500; letter-spacing: -0.1px; box-shadow: var(--shadow-card); }
.section-heading .stamp,
.compact-heading .stamp,
.horizontal-heading .stamp,
.download-copy .stamp,
.contact-copy .stamp {
  min-height: auto;
  padding: 0;
  gap: 12px;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
  color: var(--graphite);
  font-family: var(--font-heading);
  font-size: 18px;
  line-height: 1.5;
  font-weight: 600;
  letter-spacing: 0.01em;
}
.section-heading .stamp::before,
.compact-heading .stamp::before,
.horizontal-heading .stamp::before,
.download-copy .stamp::before,
.contact-copy .stamp::before {
  content: "";
  width: 30px;
  height: 2px;
  flex: 0 0 30px;
  background: var(--ink);
}
.hero h1 { max-width: 700px; margin: 26px 0; color: var(--graphite); font-family: var(--font-heading); font-size: clamp(56px, 6vw, 72px); line-height: 1.08; letter-spacing: 0.01em; font-weight: 600; }
.hero-copy > p { max-width: 590px; margin: 0; color: var(--slate); font-size: 20px; line-height: 1.5; letter-spacing: -0.2px; }
.hero-actions { display: flex; gap: 10px; margin-top: 32px; }
.primary-button, .secondary-button { min-height: 48px; padding: 0 26px; display: inline-flex; align-items: center; justify-content: center; border: 0; border-radius: var(--radius-pill); font-size: 16px; font-weight: 500; white-space: nowrap; }
.primary-button { background: var(--ink); color: var(--white); }
.primary-button:hover { background: var(--graphite); }
.secondary-button { background: var(--white); color: var(--graphite); box-shadow: var(--shadow-card); }
.secondary-button:hover { color: var(--blue); box-shadow: var(--shadow-hover); }
.version-line { display: block; margin-top: 18px; color: var(--stone); font-family: var(--font-mono); font-size: 13px; line-height: 1.4; letter-spacing: -0.24px; }

.hero-showcase { min-width: 0; overflow: hidden; border-radius: var(--radius-card); background: var(--white); box-shadow: var(--shadow-hover); }
.showcase-topbar { height: 52px; padding: 0 16px; display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--silver); }
.showcase-topbar > div { display: flex; align-items: center; gap: 8px; }
.showcase-topbar img { width: 25px; height: 25px; object-fit: contain; }
.showcase-topbar strong { font-size: 13px; font-weight: 600; }
.showcase-topbar > span { color: var(--stone); font-size: 12px; }
.showcase-layout { min-height: 430px; display: grid; grid-template-columns: 112px minmax(0, 1fr); }
.showcase-layout aside { padding: 18px 10px; display: flex; flex-direction: column; gap: 5px; background: var(--paper); }
.showcase-layout aside span, .showcase-layout aside b { padding: 8px 9px; border-radius: var(--radius-input); font-size: 12px; font-weight: 500; font-style: normal; }
.showcase-layout aside b { background: var(--ink); color: var(--white); }
.showcase-layout aside span { color: var(--stone); }
.showcase-panel { min-width: 0; padding: 24px; }
.showcase-heading { display: flex; justify-content: space-between; gap: 12px; margin-bottom: 28px; }
.showcase-heading small, .showcase-heading strong { display: block; }
.showcase-heading small { margin-bottom: 4px; color: var(--stone); font-size: 12px; }
.showcase-heading strong { font-family: var(--font-heading); font-size: 20px; font-weight: 600; letter-spacing: 0.2px; }
.showcase-heading em { align-self: flex-start; padding: 4px 9px; border-radius: var(--radius-pill); background: var(--paper); color: var(--slate); font-size: 12px; font-style: normal; }
.showcase-panel label { display: block; margin-bottom: 8px; color: var(--slate); font-size: 12px; font-weight: 500; }
.showcase-panel > p { min-height: 86px; margin: 0; padding: 13px; border-radius: var(--radius-input); background: var(--paper); color: var(--graphite); font-size: 13px; line-height: 1.5; }
.showcase-options { display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; margin-top: 14px; }
.showcase-options span, .showcase-options b, .showcase-tags span { padding: 8px 6px; border-radius: var(--radius-pill); text-align: center; font-size: 12px; font-weight: 500; }
.showcase-options span, .showcase-tags span { background: var(--paper); color: var(--slate); }
.showcase-options b { background: var(--ink); color: var(--white); }
.showcase-tags { display: flex; gap: 6px; margin-top: 8px; }
.showcase-tags span { padding-left: 12px; padding-right: 12px; }
.showcase-result { display: flex; align-items: center; gap: 16px; margin-top: 28px; padding-top: 18px; border-top: 1px solid var(--silver); }
.showcase-result button { margin-left: auto; padding: 10px 16px; border: 0; border-radius: var(--radius-input); background: var(--ink); color: var(--white); font-size: 12px; pointer-events: none; }
.showcase-wave { height: 36px; display: flex; align-items: center; gap: 3px; overflow: hidden; }
.showcase-wave i { width: 3px; height: 12px; background: var(--graphite); }
.showcase-wave i:nth-child(2n) { height: 24px; }
.showcase-wave i:nth-child(3n) { height: 32px; }
.showcase-wave i:nth-child(5n) { height: 18px; }

.section { width: calc(100% - 48px); max-width: 1200px; margin: 0 auto; padding: 96px 0; }
.section-heading { max-width: 720px; margin: 0 auto 48px; text-align: center; }
.section-heading .stamp { margin-bottom: 20px; }
.section-heading h2 { margin: 0; color: var(--graphite); font-family: var(--font-heading); font-size: clamp(46px, 5.2vw, 56px); line-height: 1.1; letter-spacing: 0.01em; font-weight: 600; }
.section-heading p { max-width: 650px; margin: 22px auto 0; color: var(--slate); font-size: 18px; line-height: 1.5; }

.feature-grid { display: grid; gap: 24px; }
.feature-card { min-width: 0; padding: 16px; display: grid; grid-template-columns: minmax(300px, 0.72fr) minmax(0, 1.28fr); align-items: stretch; gap: 20px; border-radius: var(--radius-card); background: var(--white); box-shadow: var(--shadow-card); transition: box-shadow 180ms ease, transform 180ms ease; }
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.feature-card:nth-child(even) { grid-template-columns: minmax(0, 1.28fr) minmax(300px, 0.72fr); }
.feature-card:nth-child(even) .feature-copy { order: 2; }
.feature-card:nth-child(even) .product-window { order: 1; }
.feature-copy { align-self: center; padding: 40px 32px; }
.feature-index { display: inline-flex; padding: 4px 11px; border-radius: var(--radius-pill); background: var(--paper); color: var(--graphite); font-family: var(--font-mono); font-size: 12px; font-weight: 500; }
.feature-copy h3 { margin: 26px 0 14px; color: var(--graphite); font-family: var(--font-heading); font-size: 36px; line-height: 1.2; letter-spacing: 0.01em; font-weight: 600; }
.feature-copy > p { margin: 0; color: var(--slate); font-size: 18px; line-height: 1.5; }
.feature-copy ul { display: grid; gap: 10px; margin: 24px 0 0; padding: 0; list-style: none; }
.feature-copy li { position: relative; padding-left: 20px; color: var(--graphite); font-size: 16px; line-height: 1.5; }
.feature-copy li::before { content: "✓"; position: absolute; left: 0; color: var(--slate); font-weight: 600; }

.product-window { min-height: 390px; overflow: hidden; border-radius: var(--radius-card); background: var(--paper); box-shadow: rgba(36, 36, 36, 0.04) 0 2px 6px inset; }
.window-bar { height: 50px; padding: 0 16px; display: flex; align-items: center; gap: 9px; border-bottom: 1px solid var(--silver); font-size: 13px; }
.window-bar i { width: 8px; height: 8px; border-radius: 50%; background: var(--ink); }
.window-bar span { font-weight: 500; }
.window-bar b { margin-left: auto; padding: 4px 10px; border-radius: var(--radius-pill); background: var(--white); color: var(--slate); font-size: 12px; font-weight: 500; }
.window-body { padding: 20px; }
.mock-label { display: flex; justify-content: space-between; color: var(--slate); font-size: 12px; font-weight: 500; }
.mock-label small { font-size: 12px; }
.mock-text { min-height: 86px; margin-top: 8px; padding: 13px; border-radius: var(--radius-input); background: var(--white); color: var(--graphite); font-size: 14px; line-height: 1.5; }
.mock-tabs, .mock-controls { display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; }
.mock-tabs { margin-top: 14px; }
.mock-controls { margin-top: 7px; }
.mock-tabs span, .mock-controls span { padding: 9px 6px; border-radius: var(--radius-pill); background: var(--white); color: var(--slate); text-align: center; font-size: 12px; font-weight: 500; }
.mock-tabs .active { background: var(--ink); color: var(--white); }
.mock-footer { display: flex; align-items: end; gap: 14px; margin-top: 18px; }
.mock-footer b { margin-left: auto; padding: 10px 15px; border-radius: var(--radius-input); background: var(--ink); color: var(--white); font-size: 12px; font-weight: 500; }
.mini-wave { height: 42px; display: flex; align-items: center; gap: 2px; overflow: hidden; }
.mini-wave i { width: 2px; flex: 0 0 2px; background: var(--graphite); }

.subtitle-window { padding-bottom: 16px; }
.audio-file { margin: 18px; padding: 12px; display: flex; align-items: center; gap: 11px; border-radius: var(--radius-input); background: var(--white); }
.play-symbol { width: 36px; height: 36px; display: grid; place-items: center; border-radius: 50%; background: var(--ink); color: var(--white); font-size: 12px; }
.audio-file div { min-width: 0; }
.audio-file strong, .audio-file small { display: block; }
.audio-file strong { font-size: 14px; font-weight: 500; }
.audio-file small { margin-top: 3px; color: var(--stone); font-size: 12px; }
.audio-file em { margin-left: auto; color: var(--stone); font-style: normal; }
.transcript-list { margin: 0 18px; overflow: hidden; border-radius: var(--radius-input); background: var(--white); }
.transcript-list > div { display: grid; grid-template-columns: 78px 1fr; gap: 10px; padding: 13px; border-top: 1px solid var(--silver); }
.transcript-list > div:first-child { border-top: 0; }
.transcript-list time { color: var(--stone); font-family: var(--font-mono); font-size: 12px; }
.transcript-list p { margin: 0; color: var(--graphite); font-size: 14px; line-height: 1.5; }
.export-row { display: flex; justify-content: flex-end; gap: 7px; margin: 16px 18px 0; }
.export-row span, .export-row b { padding: 9px 14px; border-radius: var(--radius-pill); font-size: 12px; font-weight: 500; }
.export-row span { background: var(--white); color: var(--graphite); }
.export-row b { background: var(--ink); color: var(--white); }

.scenes-section { display: block; }
.compact-heading { max-width: 650px; margin: 0 auto 48px; text-align: center; }
.compact-heading .stamp { margin-bottom: 20px; }
.compact-heading h2 { position: static; }
.scene-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.scene-list article { min-height: 190px; padding: 24px; display: flex; flex-direction: column; border-radius: var(--radius-card); background: var(--white); box-shadow: var(--shadow-card); transition: transform 180ms ease, box-shadow 180ms ease; }
.scene-list article:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.scene-list article > span { color: var(--stone); font-family: var(--font-mono); font-size: 12px; }
.scene-list h3 { margin: auto 0 10px; color: var(--graphite); font-family: var(--font-heading); font-size: 24px; line-height: 1.3; letter-spacing: 0.01em; font-weight: 600; }
.scene-list p { margin: 0; color: var(--slate); font-size: 16px; line-height: 1.5; }

.horizontal-heading { max-width: 760px; }
.horizontal-heading > div { display: contents; }
.horizontal-heading .stamp { margin-bottom: 20px; }
.horizontal-heading h2 { font-size: clamp(46px, 5.2vw, 56px); }
.requirement-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.requirement-grid article { min-height: 210px; padding: 24px; display: flex; flex-direction: column; border-radius: var(--radius-card); background: var(--white); box-shadow: var(--shadow-card); transition: transform 180ms ease, box-shadow 180ms ease; }
.requirement-grid article:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.requirement-grid article > span { color: var(--stone); font-family: var(--font-mono); font-size: 12px; }
.requirement-grid h3 { margin: auto 0 10px; color: var(--graphite); font-family: var(--font-heading); font-size: 24px; line-height: 1.3; letter-spacing: 0.01em; font-weight: 600; }
.requirement-grid p { margin: 0; color: var(--slate); font-size: 16px; line-height: 1.5; }

.download-section { padding-top: 64px; padding-bottom: 64px; }
.download-card { min-height: 370px; padding: 48px; display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 64px; align-items: center; border-radius: var(--radius-card); background: var(--white); box-shadow: var(--shadow-card); transition: transform 180ms ease, box-shadow 180ms ease; }
.download-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.download-copy h2 { max-width: 700px; margin: 26px 0 18px; color: var(--graphite); font-family: var(--font-heading); font-size: clamp(46px, 5.2vw, 56px); line-height: 1.1; letter-spacing: 0.01em; font-weight: 600; }
.download-copy p { max-width: 620px; margin: 0; color: var(--slate); font-size: 18px; line-height: 1.5; }
.download-action { padding: 24px; border-radius: var(--radius-card); background: var(--paper); }
.download-action > div { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 28px; }
.download-action span, .download-action small { color: var(--stone); font-size: 12px; }
.download-action strong { font-family: var(--font-mono); font-size: 24px; line-height: 1.3; font-weight: 600; }
.download-action button { width: 100%; }
.download-action small { display: block; margin-top: 12px; text-align: center; line-height: 1.5; }

.contact-section { padding: 48px; display: grid; grid-template-columns: minmax(0, 1fr) 340px; gap: 72px; align-items: center; border-radius: var(--radius-card); background: var(--white); box-shadow: var(--shadow-card); transition: transform 180ms ease, box-shadow 180ms ease; }
.contact-section:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.contact-copy h2 { max-width: 690px; margin: 26px 0 18px; color: var(--graphite); font-family: var(--font-heading); font-size: clamp(46px, 5.2vw, 56px); line-height: 1.1; letter-spacing: 0.01em; font-weight: 600; }
.contact-copy > p { max-width: 620px; margin: 0; color: var(--slate); font-size: 18px; line-height: 1.5; }
.group-number { max-width: 420px; margin-top: 28px; padding: 14px 18px; display: flex; align-items: baseline; justify-content: space-between; border-radius: var(--radius-pill); background: var(--paper); }
.group-number span { color: var(--slate); font-size: 16px; }
.group-number strong { font-family: var(--font-mono); font-size: 20px; font-weight: 600; }
.qr-card { padding: 12px; border-radius: var(--radius-card); background: var(--paper); }
.qr-card img { width: 100%; aspect-ratio: 1 / 1.17; display: block; object-fit: cover; object-position: center 34%; border-radius: var(--radius-input); }
.qr-card > div { padding: 14px 5px 4px; }
.qr-card strong, .qr-card span { display: block; }
.qr-card strong { font-size: 16px; font-weight: 600; }
.qr-card span { margin-top: 4px; color: var(--stone); font-size: 14px; }

footer { width: calc(100% - 48px); max-width: 1200px; margin: 88px auto 0; padding: 32px 0 40px; border-top: 1px solid var(--silver); }
.footer-top, .footer-bottom { display: flex; align-items: center; justify-content: space-between; gap: 32px; }
.footer-top p { max-width: 660px; margin: 0; color: var(--slate); font-size: 14px; line-height: 1.5; text-align: right; }
.footer-bottom { margin-top: 28px; color: var(--stone); font-family: var(--font-mono); font-size: 13px; line-height: 1.5; }
.footer-bottom a { color: var(--blue); }
.notice { position: fixed; z-index: 40; left: 50%; bottom: 24px; transform: translateX(-50%); min-width: 240px; padding: 12px 18px; border-radius: var(--radius-pill); background: var(--ink); color: var(--white); box-shadow: var(--shadow-hover); text-align: center; font-size: 14px; font-weight: 500; }

@media (max-width: 1080px) {
  .hero { grid-template-columns: minmax(0, 0.8fr) minmax(430px, 1.2fr); gap: 40px; }
  .section, footer { width: calc(100% - 64px); }
  .requirement-grid { grid-template-columns: 1fr 1fr; }
  .requirement-grid article { min-height: 180px; }
}

@media (max-width: 900px) {
  .topbar { width: calc(100% - 32px); }
  .nav-download { margin-left: auto; }
  .menu-button { display: block; }
  .nav-links { position: absolute; top: 62px; left: 0; right: 0; display: none; flex-direction: column; align-items: stretch; gap: 0; padding: 8px; border-radius: var(--radius-card); background: var(--white); box-shadow: var(--shadow-hover); }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 11px 12px; border-radius: var(--radius-input); }
  .nav-links a:hover { background: var(--paper); }
  .hero { width: calc(100% - 48px); min-height: auto; padding: 56px 0 72px; grid-template-columns: 1fr; gap: 48px; }
  .hero-copy { max-width: 680px; padding: 0; }
  .hero-showcase { max-width: 680px; }
  .feature-card, .feature-card:nth-child(even) { grid-template-columns: 1fr; }
  .feature-card:nth-child(even) .feature-copy, .feature-card:nth-child(even) .product-window { order: initial; }
  .feature-copy { padding: 32px 24px; }
  .scene-list { grid-template-columns: 1fr 1fr; }
  .download-card { grid-template-columns: 1fr; gap: 36px; }
  .download-action { max-width: 420px; }
  .contact-section { grid-template-columns: 1fr; gap: 40px; }
  .qr-card { max-width: 340px; }
}

@media (max-width: 600px) {
  html { scroll-padding-top: 78px; }
  .topbar { width: calc(100% - 24px); height: 64px; gap: 8px; }
  .brand { font-size: 14px; }
  .brand img { width: 30px; height: 30px; }
  .nav-download { min-height: 36px; padding: 0 12px; font-size: 12px; }
  .menu-button { width: 36px; height: 36px; }
  .nav-links { top: 58px; }
  .hero { width: calc(100% - 32px); padding: 48px 0 64px; gap: 36px; }
  .hero h1 { font-size: 48px; }
  .hero-copy > p { font-size: 17px; }
  .hero-actions { flex-direction: column; margin-top: 28px; }
  .hero-actions > * { width: 100%; }
  .showcase-layout { min-height: 400px; grid-template-columns: 1fr; }
  .showcase-layout aside { display: none; }
  .showcase-panel { padding: 18px; }
  .showcase-options span, .showcase-options b { padding-left: 3px; padding-right: 3px; }
  .section { width: calc(100% - 32px); padding: 72px 0; }
  .section-heading { margin-bottom: 36px; }
  .section-heading h2, .compact-heading h2, .horizontal-heading h2, .contact-copy h2 { font-size: 40px; }
  .feature-card { padding: 8px; gap: 8px; }
  .feature-copy { padding: 24px 16px; }
  .feature-copy h3 { font-size: 28px; }
  .product-window { min-height: 360px; }
  .scene-list { grid-template-columns: 1fr; }
  .scene-list article { min-height: 166px; }
  .requirement-grid { grid-template-columns: 1fr; }
  .requirement-grid article { min-height: 164px; }
  .download-section { width: calc(100% - 16px); }
  .download-card { padding: 28px 20px; }
  .download-copy h2 { font-size: 40px; }
  .contact-section { width: calc(100% - 16px); padding: 28px 20px; }
  footer { width: calc(100% - 32px); margin-top: 64px; }
  .footer-top, .footer-bottom { align-items: flex-start; flex-direction: column; }
  .footer-top p { text-align: left; }
  .footer-bottom { gap: 12px; }
}