:root {
  color-scheme: light;
  --paper: #fff7e8;
  --white: #fffef9;
  --ink: #171717;
  --muted: #655f55;
  --yellow: #ffd84d;
  --blue: #5b7cfa;
  --blue-dark: #304fca;
  --coral: #ff6b6b;
  --mint: #6fd6a7;
  --lavender: #b9a7ff;
  --border: 3px solid var(--ink);
  --border-thin: 2px solid var(--ink);
  --shadow: 7px 7px 0 var(--ink);
  --shadow-sm: 4px 4px 0 var(--ink);
  --display: "Space Grotesk", "Arial Black", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-synthesis: none;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); line-height: 1.6; }
body::before {
  position: fixed; inset: 0; z-index: -1; content: ""; pointer-events: none; opacity: .25;
  background-image: radial-gradient(#171717 0.55px, transparent 0.55px);
  background-size: 9px 9px;
}
a { color: inherit; }
button, select { font: inherit; }
img { display: block; max-width: 100%; }
:focus-visible { outline: 4px solid var(--blue); outline-offset: 4px; }
.skip-link { position: fixed; z-index: 100; top: 10px; left: 10px; transform: translateY(-150%); padding: 8px 14px; border: var(--border-thin); background: var(--yellow); font-weight: 800; }
.skip-link:focus { transform: translateY(0); }
.shell { width: min(1180px, calc(100% - 40px)); margin-inline: auto; }

.site-header { position: sticky; z-index: 20; top: 0; padding: 16px 0; background: color-mix(in srgb, var(--paper) 92%, transparent); backdrop-filter: blur(12px); }
.header-inner { display: flex; align-items: center; gap: 26px; min-height: 54px; padding: 8px 10px 8px 14px; border: var(--border-thin); border-radius: 9px; background: var(--white); box-shadow: var(--shadow-sm); }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; font: 900 20px/1 var(--display); letter-spacing: -.04em; }
.brand img { width: 38px; height: 38px; }
.nav { display: flex; align-items: center; gap: 24px; margin-left: auto; }
.nav a { text-decoration: none; font-size: 14px; font-weight: 800; }
.nav a:hover { text-decoration: underline; text-decoration-thickness: 3px; text-underline-offset: 5px; }
.language-wrap { position: relative; display: inline-flex; align-items: center; }
.language-wrap::before { position: absolute; left: 12px; content: "文"; font-size: 13px; font-weight: 900; pointer-events: none; }
.language-select { min-height: 38px; padding: 0 34px 0 34px; border: var(--border-thin); border-radius: 5px; background: var(--paper); color: var(--ink); cursor: pointer; font-weight: 800; }

.hero { display: grid; grid-template-columns: 1.02fr .98fr; align-items: center; gap: clamp(44px, 7vw, 92px); min-height: 760px; padding: 86px 0 110px; }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; margin: 0 0 20px; padding: 5px 11px; border: var(--border-thin); border-radius: 999px; background: var(--mint); font: 900 12px/1.4 ui-monospace, SFMono-Regular, Consolas, monospace; letter-spacing: .06em; text-transform: uppercase; }
.eyebrow-dot { width: 9px; height: 9px; border: 2px solid var(--ink); border-radius: 50%; background: var(--white); }
h1, h2, h3 { margin-top: 0; font-family: var(--display); line-height: 1.02; letter-spacing: -.055em; }
h1 { max-width: 760px; margin-bottom: 25px; font-size: clamp(56px, 7.6vw, 100px); }
h1 .highlight { position: relative; display: inline-block; z-index: 0; }
h1 .highlight::after { position: absolute; z-index: -1; right: -5px; bottom: .07em; left: -5px; height: .26em; content: ""; background: var(--yellow); transform: rotate(-1deg); }
.hero-copy { max-width: 610px; margin: 0 0 30px; color: var(--muted); font-size: clamp(18px, 2vw, 22px); line-height: 1.55; }
.actions { display: flex; flex-wrap: wrap; gap: 15px; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 0 20px; border: var(--border-thin); border-radius: 5px; background: var(--white); box-shadow: var(--shadow-sm); text-decoration: none; font-weight: 900; transition: transform 100ms ease, box-shadow 100ms ease, background 150ms ease; }
.button:hover { background: var(--yellow); }
.button:active { transform: translate(4px, 4px); box-shadow: none; }
.button.primary { background: var(--blue); color: var(--white); }
.button.primary:hover { background: var(--lavender); color: var(--ink); }

.studio { position: relative; min-width: 0; }
.studio::before { position: absolute; z-index: -1; inset: -28px -22px 32px 30px; content: ""; border: var(--border); border-radius: 50%; background: var(--yellow); transform: rotate(-4deg); }
.studio-window { overflow: hidden; border: var(--border); border-radius: 10px; background: var(--white); box-shadow: 12px 12px 0 var(--ink); transform: rotate(1.4deg); }
.window-bar { display: flex; align-items: center; gap: 7px; min-height: 44px; padding: 0 13px; border-bottom: var(--border-thin); background: var(--lavender); }
.window-dot { width: 10px; height: 10px; border: 2px solid var(--ink); border-radius: 50%; }
.window-title { margin-left: 7px; font: 800 11px ui-monospace, SFMono-Regular, Consolas, monospace; letter-spacing: .04em; }
.window-status { margin-left: auto; padding: 2px 7px; border: 1.5px solid var(--ink); background: var(--mint); font: 800 9px ui-monospace, SFMono-Regular, Consolas, monospace; }
.studio-body { display: grid; grid-template-columns: 1fr 94px; min-height: 385px; }
.preview { position: relative; display: grid; place-items: center; overflow: hidden; min-height: 300px; border-right: var(--border-thin); background: #dbe3ff; }
.preview::before, .preview::after { position: absolute; content: ""; border: var(--border-thin); border-radius: 50%; }
.preview::before { width: 235px; height: 235px; background: var(--mint); transform: translate(40%, -30%); }
.preview::after { width: 165px; height: 165px; background: var(--yellow); transform: translate(-65%, 62%); }
.demo-card { position: relative; z-index: 2; width: 72%; padding: 22px; border: var(--border); border-radius: 7px; background: var(--white); box-shadow: var(--shadow); transform: rotate(-1deg); }
.demo-label { display: inline-block; margin-bottom: 15px; padding: 3px 8px; border: 1.5px solid var(--ink); background: var(--coral); font: 900 9px ui-monospace, SFMono-Regular, Consolas, monospace; }
.demo-line { height: 13px; margin: 8px 0; border: 1.5px solid var(--ink); background: var(--ink); }
.demo-line.short { width: 54%; }
.demo-cta { width: 74px; height: 29px; margin-top: 18px; border: var(--border-thin); border-radius: 4px; background: var(--blue); box-shadow: 3px 3px 0 var(--ink); }
.focus-frame { position: absolute; z-index: 3; width: 135px; height: 72px; border: 4px solid var(--coral); border-radius: 8px; transform: translate(42px, 72px); }
.focus-tag { position: absolute; right: -3px; bottom: -22px; padding: 1px 6px; border: 2px solid var(--ink); background: var(--coral); font: 900 9px ui-monospace, SFMono-Regular, Consolas, monospace; }
.tool-rail { display: grid; align-content: start; gap: 9px; padding: 12px; background: var(--paper); }
.tool { display: grid; place-items: center; min-height: 40px; border: var(--border-thin); border-radius: 5px; background: var(--white); box-shadow: 3px 3px 0 var(--ink); font-size: 17px; }
.tool.active { background: var(--yellow); }
.timeline { grid-column: 1 / -1; display: grid; gap: 10px; padding: 13px; border-top: var(--border-thin); background: var(--white); }
.track { position: relative; height: 20px; border: 1.5px solid var(--ink); background: repeating-linear-gradient(90deg, #dbe3ff 0 16px, var(--blue) 16px 18px); }
.track.audio { height: 15px; background: repeating-linear-gradient(90deg, var(--mint) 0 7px, var(--white) 7px 10px); }
.playhead { position: absolute; top: -7px; bottom: -24px; left: 61%; width: 3px; background: var(--coral); }
.playhead::before { position: absolute; top: -7px; left: -5px; width: 13px; height: 13px; border: 2px solid var(--ink); background: var(--coral); content: ""; transform: rotate(45deg); }
.floating-note { position: absolute; z-index: 4; right: -28px; bottom: -36px; width: 180px; padding: 12px 14px; border: var(--border-thin); background: var(--mint); box-shadow: var(--shadow-sm); font: 900 12px/1.35 var(--display); transform: rotate(-3deg); }

.trust-strip { border-block: var(--border); background: var(--ink); color: var(--white); }
.trust-items { display: grid; grid-template-columns: repeat(4, 1fr); }
.trust-item { padding: 24px 20px; text-align: center; font: 800 13px ui-monospace, SFMono-Regular, Consolas, monospace; letter-spacing: .02em; }
.trust-item + .trust-item { border-left: 2px solid var(--white); }
.trust-item strong { display: block; margin-bottom: 3px; color: var(--yellow); font: 900 21px var(--display); letter-spacing: -.03em; }

.section { padding: 120px 0; }
.section-head { display: grid; grid-template-columns: .8fr 1.2fr; gap: 50px; align-items: end; margin-bottom: 50px; }
.section h2 { margin-bottom: 0; font-size: clamp(42px, 5.2vw, 68px); }
.section-intro { max-width: 650px; margin: 0; color: var(--muted); font-size: 19px; }
.feature-grid { display: grid; grid-template-columns: repeat(12, 1fr); gap: 22px; }
.feature-card { position: relative; overflow: hidden; grid-column: span 4; min-height: 280px; padding: 28px; border: var(--border); border-radius: 7px; background: var(--white); box-shadow: var(--shadow); }
.feature-card.wide { grid-column: span 8; }
.feature-card.blue { background: #dbe3ff; }
.feature-card.yellow { background: #fff0a6; }
.feature-card.mint { background: #c9f3df; }
.feature-card.lavender { background: #e4dcff; }
.feature-index { display: inline-grid; place-items: center; width: 38px; height: 38px; margin-bottom: 35px; border: var(--border-thin); border-radius: 50%; background: var(--white); font: 900 12px ui-monospace, SFMono-Regular, Consolas, monospace; }
.feature-card h3 { margin-bottom: 14px; font-size: 29px; }
.feature-card p { max-width: 47ch; margin: 0; color: #48443d; font-size: 16px; }
.feature-stamp { position: absolute; right: -24px; top: 22px; padding: 7px 31px; border-block: 2px solid var(--ink); background: var(--coral); font: 900 10px ui-monospace, SFMono-Regular, Consolas, monospace; transform: rotate(39deg); }

.workflow { background: var(--blue); color: var(--white); border-block: var(--border); }
.workflow .eyebrow { color: var(--ink); }
.workflow .section-intro { color: #eff2ff; }
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.step { position: relative; padding: 28px; border: var(--border); border-radius: 7px; background: var(--white); color: var(--ink); box-shadow: 7px 7px 0 #101010; }
.step-number { display: inline-grid; place-items: center; width: 44px; height: 44px; margin-bottom: 36px; border: var(--border-thin); background: var(--yellow); font: 900 18px var(--display); transform: rotate(-4deg); }
.step h3 { margin-bottom: 11px; font-size: 29px; }
.step p { margin: 0; color: var(--muted); }
.step:not(:last-child)::after { position: absolute; z-index: 3; top: 38px; right: -31px; content: "→"; color: var(--yellow); font: 900 42px var(--display); -webkit-text-stroke: 2px var(--ink); }

.privacy-callout { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 40px; padding: clamp(32px, 6vw, 70px); border: var(--border); border-radius: 10px; background: var(--yellow); box-shadow: 10px 10px 0 var(--ink); }
.privacy-callout h2 { margin-bottom: 16px; max-width: 760px; }
.privacy-callout p { max-width: 720px; margin: 0; color: #49443a; font-size: 18px; }
.privacy-seal { display: grid; place-items: center; width: 145px; height: 145px; padding: 22px; border: 4px solid var(--ink); border-radius: 50%; background: var(--mint); text-align: center; font: 900 15px/1.15 var(--display); transform: rotate(7deg); }

.footer { padding: 55px 0 42px; }
.footer-inner { display: grid; grid-template-columns: 1fr auto; gap: 30px; padding-top: 30px; border-top: var(--border-thin); }
.footer-copy { max-width: 520px; margin: 12px 0 0; color: var(--muted); font-size: 14px; }
.footer-links { display: flex; gap: 24px; align-items: start; font-weight: 800; }

.privacy-hero { padding: 76px 0 54px; }
.privacy-hero h1 { max-width: 930px; margin-bottom: 22px; font-size: clamp(55px, 7vw, 92px); }
.privacy-hero-copy { max-width: 760px; margin: 0; color: var(--muted); font-size: 20px; }
.privacy-layout { display: grid; grid-template-columns: 255px minmax(0, 760px); gap: clamp(42px, 8vw, 110px); align-items: start; padding-bottom: 120px; }
.privacy-toc { position: sticky; top: 105px; padding: 22px; border: var(--border-thin); border-radius: 6px; background: var(--white); box-shadow: var(--shadow-sm); }
.privacy-toc strong { display: block; margin-bottom: 12px; font: 900 12px ui-monospace, SFMono-Regular, Consolas, monospace; text-transform: uppercase; }
.privacy-toc a { display: block; padding: 7px 0; color: var(--muted); text-decoration: none; font-size: 14px; font-weight: 700; }
.privacy-toc a:hover { color: var(--ink); text-decoration: underline; }
.policy-meta { display: inline-flex; margin-bottom: 28px; padding: 5px 10px; border: var(--border-thin); background: var(--yellow); font: 800 12px ui-monospace, SFMono-Regular, Consolas, monospace; }
.policy-section { scroll-margin-top: 110px; padding: 0 0 46px; margin-bottom: 46px; border-bottom: 2px solid var(--ink); }
.policy-section:last-child { border-bottom: 0; }
.policy-section h2 { margin-bottom: 22px; font-size: clamp(30px, 4vw, 43px); }
.policy-section p { margin: 0 0 18px; color: #403c35; font-size: 17px; }
.policy-section ul { margin: 0; padding-left: 24px; }
.policy-section li { padding-left: 6px; margin: 0 0 13px; color: #403c35; font-size: 16px; }
.policy-section li::marker { color: var(--blue); font-weight: 900; }
.policy-note { margin-top: 30px; padding: 22px; border: var(--border-thin); border-left: 10px solid var(--blue); background: var(--white); box-shadow: var(--shadow-sm); }

@media (max-width: 900px) {
  .nav a { display: none; }
  .hero { grid-template-columns: 1fr; min-height: 0; padding: 70px 0 100px; }
  .hero-content { max-width: 760px; }
  .studio { width: min(650px, 95%); margin-inline: auto; }
  .section-head { grid-template-columns: 1fr; gap: 22px; }
  .feature-card, .feature-card.wide { grid-column: span 6; }
  .steps { grid-template-columns: 1fr; }
  .step:not(:last-child)::after { top: auto; right: 30px; bottom: -39px; transform: rotate(90deg); }
  .privacy-callout { grid-template-columns: 1fr; }
  .privacy-seal { width: 118px; height: 118px; }
  .privacy-layout { grid-template-columns: 1fr; }
  .privacy-toc { position: static; display: grid; grid-template-columns: repeat(2, 1fr); gap: 0 16px; }
  .privacy-toc strong { grid-column: 1 / -1; }
}

@media (max-width: 620px) {
  .shell { width: min(100% - 24px, 1180px); }
  .site-header { padding: 10px 0; }
  .header-inner { gap: 10px; min-height: 50px; padding: 6px 7px 6px 10px; }
  .brand img { width: 34px; height: 34px; }
  .brand span { display: none; }
  .language-select { max-width: 130px; }
  .hero { padding-top: 48px; }
  h1 { font-size: clamp(50px, 16vw, 72px); }
  .hero-copy { font-size: 18px; }
  .actions { display: grid; }
  .button { width: 100%; }
  .studio::before { inset: -18px -8px 26px 15px; }
  .studio-window { box-shadow: 7px 7px 0 var(--ink); }
  .studio-body { grid-template-columns: 1fr 58px; min-height: 325px; }
  .tool-rail { gap: 7px; padding: 8px; }
  .tool { min-height: 34px; }
  .demo-card { width: 80%; padding: 15px; }
  .focus-frame { width: 110px; transform: translate(25px, 58px); }
  .floating-note { right: -3px; bottom: -62px; }
  .trust-items { grid-template-columns: repeat(2, 1fr); }
  .trust-item:nth-child(3) { border-left: 0; border-top: 2px solid var(--white); }
  .trust-item:nth-child(4) { border-top: 2px solid var(--white); }
  .section { padding: 90px 0; }
  .feature-card, .feature-card.wide { grid-column: 1 / -1; min-height: 0; }
  .privacy-callout { padding: 28px; }
  .privacy-seal { display: none; }
  .footer-inner { grid-template-columns: 1fr; }
  .footer-links { flex-wrap: wrap; }
  .privacy-hero { padding-top: 54px; }
  .privacy-toc { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}