/* =========================================================
   嘟嘟加速器 / Dudu VPN Website v1.0.0
   Local-only assets. No external CSS, JavaScript, or fonts.
   ========================================================= */

:root {
    --orange-700: #b94f16;
    --orange-600: #cf5e1d;
    --orange-500: #e1732e;
    --orange-300: #f2a56c;
    --orange-100: #fff0e3;
    --ink-950: #171717;
    --ink-900: #222222;
    --ink-800: #303030;
    --ink-700: #454545;
    --ink-600: #626262;
    --ink-500: #7a7a7a;
    --ink-300: #b6b3ae;
    --line: #dfdcd6;
    --line-strong: #cac5bd;
    --paper: #fbfaf7;
    --paper-2: #f5f2ec;
    --paper-3: #ede8df;
    --white: #ffffff;
    --success: #536b4d;
    --danger: #9a3c2a;

    --shadow-sm: 0 8px 24px rgba(23, 23, 23, .06);
    --shadow-md: 0 22px 70px rgba(23, 23, 23, .10);
    --shadow-orange: 0 18px 50px rgba(207, 94, 29, .18);

    --radius-xs: 8px;
    --radius-sm: 14px;
    --radius-md: 22px;
    --radius-lg: 34px;
    --radius-pill: 999px;

    --container: 1180px;
    --gutter: clamp(18px, 3vw, 34px);
    --section: clamp(76px, 9vw, 128px);
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 92px; }
body {
    margin: 0;
    min-width: 320px;
    background: var(--paper);
    color: var(--ink-950);
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}
body.menu-open { overflow: hidden; }
::selection { background: var(--orange-300); color: var(--ink-950); }
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; }
button { color: inherit; }
h1, h2, h3, h4, p, ul, ol, blockquote { margin-top: 0; }
h1, h2, h3, h4 { letter-spacing: -.03em; line-height: 1.14; }
p:last-child { margin-bottom: 0; }

.skip-link {
    position: fixed;
    left: 18px;
    top: -80px;
    z-index: 999;
    padding: 10px 16px;
    border-radius: 8px;
    background: var(--ink-950);
    color: var(--white);
    transition: top .2s ease;
}
.skip-link:focus { top: 14px; }

.container { width: min(100% - (var(--gutter) * 2), var(--container)); margin-inline: auto; }
.section { padding-block: var(--section); }
.section--tight { padding-block: clamp(54px, 7vw, 88px); }
.section--paper-2 { background: var(--paper-2); }
.section--ink { background: var(--ink-950); color: var(--white); }
.section--orange { background: var(--orange-600); color: var(--white); }

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 9px;
    margin-bottom: 18px;
    color: var(--orange-700);
    font-size: 12px;
    font-weight: 750;
    letter-spacing: .18em;
    text-transform: uppercase;
}
.eyebrow::before { content: ""; width: 26px; height: 1px; background: currentColor; }
.section--ink .eyebrow, .section--orange .eyebrow { color: #ffd7ba; }

.section-heading { max-width: 760px; margin-bottom: clamp(38px, 5vw, 64px); }
.section-heading--center { margin-inline: auto; text-align: center; }
.section-heading--center .eyebrow { justify-content: center; }
.section-heading h2 {
    margin-bottom: 18px;
    font-size: clamp(34px, 4.8vw, 58px);
    font-weight: 720;
}
.section-heading p { max-width: 650px; color: var(--ink-600); font-size: clamp(16px, 2vw, 19px); }
.section-heading--center p { margin-inline: auto; }
.section--ink .section-heading p, .section--orange .section-heading p { color: rgba(255,255,255,.7); }

.muted { color: var(--ink-600); }
.text-orange { color: var(--orange-600); }
.small { font-size: 13px; }
.visually-hidden {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    margin: -1px !important;
    overflow: hidden !important;
    clip: rect(0, 0, 0, 0) !important;
    white-space: nowrap !important;
    border: 0 !important;
}

/* Header */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid rgba(223, 220, 214, .82);
    background: rgba(251, 250, 247, .88);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
}
.header-inner { min-height: 78px; display: flex; align-items: center; gap: 28px; }
.brand { display: inline-flex; align-items: center; gap: 11px; flex: 0 0 auto; }
.brand-mark { width: 38px; height: 38px; }
.brand-copy { display: grid; line-height: 1.05; }
.brand-copy strong { font-size: 17px; letter-spacing: -.02em; }
.brand-copy span { margin-top: 4px; color: var(--ink-500); font-size: 10px; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; }
.site-nav { display: flex; align-items: center; gap: 27px; margin-left: auto; }
.site-nav a { position: relative; padding-block: 26px; color: var(--ink-600); font-size: 14px; font-weight: 650; }
.site-nav a::after { content: ""; position: absolute; left: 0; right: 0; bottom: 18px; height: 2px; border-radius: 2px; background: var(--orange-600); transform: scaleX(0); transition: transform .22s ease; }
.site-nav a:hover, .site-nav a.is-active { color: var(--ink-950); }
.site-nav a:hover::after, .site-nav a.is-active::after { transform: scaleX(1); }
.header-actions { display: flex; align-items: center; gap: 10px; }
.lang-switch {
    min-width: 72px;
    height: 42px;
    padding: 0 13px;
    border: 1px solid var(--line);
    border-radius: var(--radius-pill);
    background: var(--white);
    color: var(--ink-700);
    cursor: pointer;
    font-size: 13px;
    font-weight: 700;
}
.lang-switch:hover { border-color: var(--orange-300); }
.menu-toggle {
    display: none;
    width: 42px;
    height: 42px;
    border: 1px solid var(--line);
    border-radius: 50%;
    background: var(--white);
    cursor: pointer;
}
.menu-toggle i, .menu-toggle i::before, .menu-toggle i::after {
    position: relative;
    display: block;
    width: 18px;
    height: 1.5px;
    margin: auto;
    border-radius: 2px;
    background: var(--ink-950);
    transition: transform .25s ease, opacity .25s ease;
}
.menu-toggle i::before, .menu-toggle i::after { content: ""; position: absolute; left: 0; }
.menu-toggle i::before { top: -6px; }
.menu-toggle i::after { top: 6px; }
.menu-open .menu-toggle i { background: transparent; }
.menu-open .menu-toggle i::before { top: 0; transform: rotate(45deg); }
.menu-open .menu-toggle i::after { top: 0; transform: rotate(-45deg); }

/* Buttons */
.btn {
    min-height: 48px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 0 22px;
    border: 1px solid transparent;
    border-radius: var(--radius-pill);
    cursor: pointer;
    font-size: 14px;
    font-weight: 750;
    letter-spacing: -.01em;
    transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease, background .18s ease;
}
.btn:hover { transform: translateY(-2px); }
.btn--dark { background: var(--ink-950); color: var(--white); box-shadow: 0 12px 28px rgba(23,23,23,.14); }
.btn--dark:hover { background: var(--ink-800); box-shadow: 0 18px 36px rgba(23,23,23,.2); }
.btn--orange { background: var(--orange-600); color: var(--white); box-shadow: var(--shadow-orange); }
.btn--orange:hover { background: var(--orange-700); }
.btn--light { background: var(--white); color: var(--ink-950); border-color: var(--line); }
.btn--light:hover { border-color: var(--ink-300); box-shadow: var(--shadow-sm); }
.btn--outline { background: transparent; color: var(--ink-950); border-color: var(--line-strong); }
.btn--outline:hover { background: var(--white); border-color: var(--ink-950); }
.btn--white { background: var(--white); color: var(--ink-950); }
.btn--white-outline { color: var(--white); border-color: rgba(255,255,255,.32); }
.btn--white-outline:hover { background: rgba(255,255,255,.08); border-color: rgba(255,255,255,.65); }
.btn--sm { min-height: 42px; padding-inline: 17px; font-size: 13px; }
.btn--lg { min-height: 56px; padding-inline: 29px; font-size: 15px; }
.btn svg { width: 17px; height: 17px; }
.btn[aria-disabled="true"] { pointer-events: none; opacity: .55; box-shadow: none; }

/* Home hero */
.hero { position: relative; overflow: hidden; padding: clamp(74px, 8vw, 116px) 0 clamp(78px, 9vw, 128px); }
.hero::before {
    content: "";
    position: absolute;
    width: min(58vw, 760px);
    height: min(58vw, 760px);
    right: -26vw;
    top: -36%;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(225,115,46,.18) 0, rgba(225,115,46,.05) 42%, transparent 71%);
    pointer-events: none;
}
.hero-grid { position: relative; display: grid; grid-template-columns: minmax(0, .93fr) minmax(480px, 1.07fr); align-items: center; gap: clamp(42px, 7vw, 94px); }
.hero-copy { position: relative; z-index: 2; }
.hero-kicker { display: inline-flex; align-items: center; gap: 9px; margin-bottom: 24px; padding: 8px 13px 8px 9px; border: 1px solid #eddbce; border-radius: var(--radius-pill); background: rgba(255,255,255,.72); color: var(--ink-700); font-size: 12px; font-weight: 700; }
.hero-kicker::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--orange-600); box-shadow: 0 0 0 5px var(--orange-100); }
.hero h1 { max-width: 680px; margin-bottom: 24px; font-size: clamp(48px, 6.7vw, 82px); font-weight: 760; letter-spacing: -.065em; }
.hero h1 em { color: var(--orange-600); font-style: normal; }
.hero-lead { max-width: 610px; margin-bottom: 30px; color: var(--ink-600); font-size: clamp(17px, 2.2vw, 20px); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 36px; }
.hero-notes { display: flex; flex-wrap: wrap; gap: 12px 24px; padding: 0; margin: 0; list-style: none; }
.hero-notes li { display: flex; align-items: center; gap: 8px; color: var(--ink-600); font-size: 13px; font-weight: 600; }
.hero-notes li::before { content: "✓"; display: grid; place-items: center; width: 20px; height: 20px; border-radius: 50%; background: var(--orange-100); color: var(--orange-700); font-size: 11px; font-weight: 900; }
.hero-art { position: relative; min-height: 590px; }
.hero-art > img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: contain; filter: drop-shadow(0 40px 60px rgba(23,23,23,.12)); }
.hero-caption { position: absolute; left: -18px; bottom: 34px; max-width: 260px; padding: 18px 20px; border: 1px solid rgba(223,220,214,.9); border-radius: 18px; background: rgba(255,255,255,.9); box-shadow: var(--shadow-sm); backdrop-filter: blur(14px); }
.hero-caption strong { display: block; margin-bottom: 4px; font-size: 14px; }
.hero-caption span { color: var(--ink-500); font-size: 12px; }

.trust-strip { border-block: 1px solid var(--line); background: var(--white); }
.trust-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.trust-item { position: relative; padding: 27px 24px; }
.trust-item + .trust-item::before { content: ""; position: absolute; top: 22%; bottom: 22%; left: 0; width: 1px; background: var(--line); }
.trust-item strong { display: block; margin-bottom: 3px; font-size: 15px; }
.trust-item span { color: var(--ink-500); font-size: 13px; }

/* Feature bento */
.bento { display: grid; grid-template-columns: repeat(12, 1fr); gap: 18px; }
.bento-card { position: relative; overflow: hidden; min-height: 290px; padding: clamp(26px, 3vw, 38px); border: 1px solid var(--line); border-radius: var(--radius-md); background: var(--white); box-shadow: 0 1px 0 rgba(255,255,255,.8) inset; transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease; }
.bento-card:hover { transform: translateY(-4px); border-color: var(--orange-300); box-shadow: var(--shadow-sm); }
.bento-card--wide { grid-column: span 7; }
.bento-card--narrow { grid-column: span 5; }
.bento-card--third { grid-column: span 4; min-height: 260px; }
.bento-card--orange { background: var(--orange-600); color: var(--white); border-color: transparent; }
.bento-card--ink { background: var(--ink-950); color: var(--white); border-color: transparent; }
.bento-index { display: inline-flex; align-items: center; justify-content: center; width: 34px; height: 34px; margin-bottom: 48px; border: 1px solid var(--line); border-radius: 50%; color: var(--ink-500); font-size: 11px; font-weight: 800; }
.bento-card--orange .bento-index, .bento-card--ink .bento-index { border-color: rgba(255,255,255,.26); color: rgba(255,255,255,.7); }
.bento-card h3 { max-width: 430px; margin-bottom: 13px; font-size: clamp(23px, 2.5vw, 32px); }
.bento-card p { max-width: 500px; color: var(--ink-600); }
.bento-card--orange p, .bento-card--ink p { color: rgba(255,255,255,.7); }
.bento-art { position: absolute; right: -4%; bottom: -2%; width: 43%; max-height: 72%; object-fit: contain; }
.bento-card--third .bento-index { margin-bottom: 35px; }
.bento-card--third h3 { font-size: 23px; }
.bento-card--third p { font-size: 14px; }

/* Editorial split */
.editorial-grid { display: grid; grid-template-columns: minmax(0, .9fr) minmax(480px, 1.1fr); gap: clamp(42px, 8vw, 108px); align-items: center; }
.editorial-grid--reverse .editorial-copy { order: 2; }
.editorial-grid--reverse .editorial-visual { order: 1; }
.editorial-copy h2 { margin-bottom: 22px; font-size: clamp(38px, 5vw, 62px); }
.editorial-copy > p { color: var(--ink-600); font-size: 18px; }
.check-list { display: grid; gap: 18px; padding: 0; margin: 34px 0 0; list-style: none; }
.check-list li { display: grid; grid-template-columns: 34px 1fr; gap: 14px; align-items: start; }
.check-list i { display: grid; place-items: center; width: 30px; height: 30px; border-radius: 50%; background: var(--orange-100); color: var(--orange-700); font-style: normal; font-size: 12px; font-weight: 900; }
.check-list strong { display: block; margin-bottom: 4px; }
.check-list span { color: var(--ink-600); font-size: 14px; }
.editorial-visual { position: relative; min-height: 520px; border-radius: var(--radius-lg); background: var(--paper-2); overflow: hidden; }
.editorial-visual img { width: 100%; height: 100%; min-height: 520px; object-fit: cover; }
.editorial-note { position: absolute; right: 24px; bottom: 24px; max-width: 265px; padding: 18px; border-radius: 16px; background: rgba(23,23,23,.9); color: var(--white); box-shadow: var(--shadow-md); }
.editorial-note strong { display: block; margin-bottom: 5px; font-size: 14px; }
.editorial-note span { color: rgba(255,255,255,.66); font-size: 12px; }

/* Use cases */
.case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.case-card { overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius-md); background: var(--white); transition: transform .22s ease, box-shadow .22s ease; }
.case-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-sm); }
.case-visual { aspect-ratio: 1.35 / 1; overflow: hidden; background: var(--paper-2); }
.case-visual img { width: 100%; height: 100%; object-fit: cover; transition: transform .45s ease; }
.case-card:hover .case-visual img { transform: scale(1.025); }
.case-body { padding: 28px; }
.case-number { display: block; margin-bottom: 24px; color: var(--orange-600); font-size: 11px; font-weight: 850; letter-spacing: .14em; }
.case-body h3 { margin-bottom: 11px; font-size: 23px; }
.case-body p { color: var(--ink-600); font-size: 14px; }

/* Platforms */
.platform-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.platform-card { display: grid; gap: 24px; min-height: 210px; padding: 28px; border: 1px solid var(--line); border-radius: var(--radius-md); background: var(--white); transition: transform .2s ease, border-color .2s ease; }
.platform-card:hover { transform: translateY(-4px); border-color: var(--orange-300); }
.platform-card img { width: 46px; height: 46px; }
.platform-card h3 { margin-bottom: 4px; font-size: 21px; }
.platform-card p { color: var(--ink-500); font-size: 13px; }
.platform-card .status { align-self: end; display: inline-flex; width: fit-content; padding: 5px 10px; border-radius: var(--radius-pill); background: var(--paper-2); color: var(--ink-600); font-size: 11px; font-weight: 750; }

/* FAQ */
.faq-list { max-width: 900px; margin: 0 auto; border-top: 1px solid var(--line); }
.faq-item { border-bottom: 1px solid var(--line); }
.faq-question { width: 100%; display: grid; grid-template-columns: 1fr 34px; gap: 18px; align-items: center; padding: 25px 0; border: 0; background: transparent; text-align: left; cursor: pointer; }
.faq-question span:first-child { font-size: clamp(17px, 2vw, 20px); font-weight: 700; letter-spacing: -.02em; }
.faq-plus { position: relative; width: 32px; height: 32px; border: 1px solid var(--line); border-radius: 50%; background: var(--white); }
.faq-plus::before, .faq-plus::after { content: ""; position: absolute; left: 9px; right: 9px; top: 15px; height: 1.5px; background: var(--ink-950); transition: transform .22s ease; }
.faq-plus::after { transform: rotate(90deg); }
.faq-item.is-open .faq-plus { border-color: var(--orange-300); background: var(--orange-100); }
.faq-item.is-open .faq-plus::after { transform: rotate(0); }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height .32s ease; }
.faq-answer-inner { padding: 0 54px 26px 0; color: var(--ink-600); }
.faq-answer-inner a { color: var(--orange-700); text-decoration: underline; text-underline-offset: 3px; }
.faq-search-wrap { max-width: 760px; margin: 0 auto 34px; }
.faq-search { width: 100%; height: 56px; padding: 0 22px; border: 1px solid var(--line); border-radius: var(--radius-pill); background: var(--white); color: var(--ink-950); outline: none; }
.faq-search:focus { border-color: var(--orange-500); box-shadow: 0 0 0 4px rgba(225,115,46,.11); }
.faq-empty { display: none; padding: 38px; border: 1px dashed var(--line-strong); border-radius: var(--radius-md); text-align: center; color: var(--ink-500); }

/* CTA */
.cta-panel { position: relative; overflow: hidden; display: grid; grid-template-columns: 1fr auto; gap: 42px; align-items: center; padding: clamp(36px, 6vw, 70px); border-radius: var(--radius-lg); background: var(--ink-950); color: var(--white); }
.cta-panel::after { content: ""; position: absolute; right: -90px; top: -130px; width: 360px; height: 360px; border-radius: 50%; border: 62px solid rgba(225,115,46,.24); }
.cta-copy { position: relative; z-index: 1; max-width: 700px; }
.cta-copy h2 { margin-bottom: 14px; font-size: clamp(34px, 4.7vw, 58px); }
.cta-copy p { color: rgba(255,255,255,.66); font-size: 17px; }
.cta-actions { position: relative; z-index: 1; display: flex; flex-wrap: wrap; gap: 10px; justify-content: flex-end; }

/* Inner page hero */
.page-hero { position: relative; overflow: hidden; padding: clamp(72px, 8vw, 112px) 0 clamp(56px, 7vw, 86px); border-bottom: 1px solid var(--line); }
.page-hero::after { content: ""; position: absolute; right: -120px; bottom: -210px; width: 480px; height: 480px; border: 74px solid rgba(225,115,46,.1); border-radius: 50%; }
.page-hero .container { position: relative; z-index: 1; }
.page-hero h1 { max-width: 900px; margin-bottom: 20px; font-size: clamp(48px, 7vw, 82px); }
.page-hero p { max-width: 720px; color: var(--ink-600); font-size: clamp(17px, 2.2vw, 20px); }
.breadcrumb { display: flex; flex-wrap: wrap; gap: 9px; align-items: center; margin-bottom: 26px; color: var(--ink-500); font-size: 12px; font-weight: 650; }
.breadcrumb a:hover { color: var(--orange-700); }
.breadcrumb i { font-style: normal; color: var(--ink-300); }

/* Download */
.download-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.download-card { position: relative; overflow: hidden; display: grid; grid-template-columns: 1fr 140px; min-height: 280px; padding: 34px; border: 1px solid var(--line); border-radius: var(--radius-md); background: var(--white); }
.download-card::after { content: ""; position: absolute; right: -90px; bottom: -110px; width: 250px; height: 250px; border: 44px solid var(--orange-100); border-radius: 50%; }
.download-content { position: relative; z-index: 1; }
.download-icon { width: 50px; height: 50px; margin-bottom: 32px; }
.download-card h2 { margin-bottom: 8px; font-size: 30px; }
.download-card p { min-height: 50px; color: var(--ink-500); font-size: 13px; }
.download-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 23px; }
.download-art { position: relative; z-index: 1; align-self: center; width: 120px; }
.download-tip { margin-top: 20px; padding: 18px 20px; border-left: 3px solid var(--orange-500); border-radius: 0 12px 12px 0; background: var(--orange-100); color: var(--ink-700); font-size: 13px; }
.steps { counter-reset: steps; display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.step { position: relative; min-height: 230px; padding: 30px 26px; border-top: 1px solid var(--line-strong); }
.step::before { counter-increment: steps; content: "0" counter(steps); display: block; margin-bottom: 52px; color: var(--orange-600); font-size: 12px; font-weight: 850; letter-spacing: .12em; }
.step h3 { margin-bottom: 10px; font-size: 21px; }
.step p { color: var(--ink-600); font-size: 13px; }

/* About */
.about-intro { display: grid; grid-template-columns: .7fr 1.3fr; gap: clamp(36px, 8vw, 120px); align-items: start; }
.about-intro h2 { font-size: clamp(38px, 5vw, 62px); }
.about-intro p { color: var(--ink-600); font-size: 18px; }
.value-grid { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.value-item { position: relative; padding: 38px 28px; }
.value-item + .value-item::before { content: ""; position: absolute; left: 0; top: 25px; bottom: 25px; width: 1px; background: var(--line); }
.value-item span { display: block; margin-bottom: 45px; color: var(--orange-600); font-size: 11px; font-weight: 850; letter-spacing: .14em; }
.value-item h3 { margin-bottom: 10px; font-size: 21px; }
.value-item p { color: var(--ink-600); font-size: 13px; }
.story-card { display: grid; grid-template-columns: 1.05fr .95fr; overflow: hidden; border-radius: var(--radius-lg); background: var(--ink-950); color: var(--white); }
.story-copy { padding: clamp(38px, 6vw, 72px); }
.story-copy h2 { margin-bottom: 24px; font-size: clamp(36px, 5vw, 58px); }
.story-copy p { color: rgba(255,255,255,.68); font-size: 16px; }
.story-visual { min-height: 500px; background: var(--orange-600); }
.story-visual img { width: 100%; height: 100%; object-fit: cover; }
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.contact-card { padding: 30px; border: 1px solid var(--line); border-radius: var(--radius-md); background: var(--white); }
.contact-card small { display: block; margin-bottom: 34px; color: var(--ink-500); font-size: 11px; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
.contact-card h3 { margin-bottom: 8px; font-size: 22px; }
.contact-card a { color: var(--orange-700); word-break: break-word; }

/* Legal */
.legal-hero { padding: clamp(58px, 7vw, 90px) 0 48px; border-bottom: 1px solid var(--line); }
.legal-hero h1 { margin-bottom: 18px; font-size: clamp(42px, 6vw, 68px); }
.legal-meta { display: flex; flex-wrap: wrap; gap: 8px 18px; color: var(--ink-500); font-size: 13px; }
.legal-shell { display: grid; grid-template-columns: 250px minmax(0, 760px); justify-content: space-between; gap: clamp(44px, 8vw, 120px); padding-block: clamp(52px, 7vw, 92px); }
.legal-toc { position: sticky; top: 108px; align-self: start; }
.legal-toc strong { display: block; margin-bottom: 16px; font-size: 12px; letter-spacing: .13em; text-transform: uppercase; }
.legal-toc nav { display: grid; gap: 7px; }
.legal-toc a { padding: 7px 0; color: var(--ink-500); font-size: 13px; }
.legal-toc a:hover { color: var(--orange-700); }
.legal-content { min-width: 0; }
.legal-content .legal-notice { margin-bottom: 34px; padding: 20px 22px; border-left: 3px solid var(--orange-600); background: var(--orange-100); color: var(--ink-700); font-size: 14px; }
.legal-section { scroll-margin-top: 110px; padding-bottom: 36px; margin-bottom: 36px; border-bottom: 1px solid var(--line); }
.legal-section:last-child { border-bottom: 0; }
.legal-section h2 { margin-bottom: 18px; font-size: 26px; }
.legal-section h3 { margin: 25px 0 10px; font-size: 18px; }
.legal-section p, .legal-section li { color: var(--ink-700); font-size: 15px; }
.legal-section ul, .legal-section ol { padding-left: 21px; }
.legal-section li + li { margin-top: 8px; }
.legal-section a { color: var(--orange-700); text-decoration: underline; text-underline-offset: 3px; }
.legal-table-wrap { overflow-x: auto; margin: 24px 0; border: 1px solid var(--line); border-radius: 14px; }
.legal-table { width: 100%; min-width: 720px; border-collapse: collapse; background: var(--white); }
.legal-table th, .legal-table td { padding: 15px 16px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; font-size: 13px; }
.legal-table th { background: var(--paper-2); color: var(--ink-950); font-weight: 750; }
.legal-table td { color: var(--ink-700); }
.legal-table tr:last-child td { border-bottom: 0; }
.legal-language-note { display: none; }
[data-language-block] { display: none; }
html[data-lang="zh"] [data-language-block="zh"], html[data-lang="en"] [data-language-block="en"] { display: contents; }

/* Footer */
.site-footer { margin-top: 0; border-top: 1px solid var(--line); background: var(--paper-2); }
.footer-main { display: grid; grid-template-columns: 1.25fr repeat(3, .75fr); gap: clamp(34px, 6vw, 80px); padding: 64px 0 48px; }
.footer-brand p { max-width: 370px; margin-top: 20px; color: var(--ink-600); font-size: 14px; }
.footer-company { margin-top: 22px; color: var(--ink-500); font-size: 12px; }
.footer-col h4 { margin-bottom: 18px; font-size: 13px; letter-spacing: .08em; text-transform: uppercase; }
.footer-col ul { display: grid; gap: 10px; padding: 0; margin: 0; list-style: none; }
.footer-col a { color: var(--ink-600); font-size: 13px; }
.footer-col a:hover { color: var(--orange-700); }
.footer-bottom { display: flex; justify-content: space-between; gap: 24px; padding: 20px 0 28px; border-top: 1px solid var(--line); color: var(--ink-500); font-size: 12px; }
.footer-bottom a { color: var(--ink-700); }

/* Toast */
.toast { position: fixed; left: 50%; bottom: 26px; z-index: 300; transform: translate(-50%, 30px); max-width: min(90vw, 560px); padding: 13px 18px; border-radius: var(--radius-pill); background: var(--ink-950); color: var(--white); box-shadow: var(--shadow-md); opacity: 0; pointer-events: none; transition: opacity .25s ease, transform .25s ease; font-size: 13px; }
.toast.is-visible { opacity: 1; transform: translate(-50%, 0); }

/* Responsive */
@media (max-width: 1040px) {
    .hero-grid, .editorial-grid { grid-template-columns: 1fr; }
    .hero-art { min-height: 540px; max-width: 720px; width: 100%; margin: 0 auto; }
    .hero-caption { left: 7%; }
    .editorial-grid--reverse .editorial-copy, .editorial-grid--reverse .editorial-visual { order: initial; }
    .bento-card--wide, .bento-card--narrow { grid-column: span 6; }
    .bento-card--third { grid-column: span 4; }
    .platform-grid { grid-template-columns: repeat(2, 1fr); }
    .steps { grid-template-columns: repeat(2, 1fr); }
    .value-grid { grid-template-columns: repeat(2, 1fr); }
    .value-item:nth-child(3)::before { display: none; }
    .value-item:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
    .legal-shell { grid-template-columns: 210px minmax(0, 1fr); gap: 54px; }
    .footer-main { grid-template-columns: 1.3fr repeat(3, 1fr); gap: 32px; }
}

@media (max-width: 840px) {
    .site-nav {
        position: fixed;
        inset: 78px 0 auto;
        display: grid;
        gap: 0;
        max-height: 0;
        overflow: hidden;
        padding-inline: var(--gutter);
        border-bottom: 1px solid transparent;
        background: rgba(251,250,247,.98);
        transition: max-height .3s ease, padding .3s ease, border-color .3s ease;
    }
    .menu-open .site-nav { max-height: 420px; padding-block: 12px 24px; border-color: var(--line); }
    .site-nav a { padding: 13px 0; font-size: 16px; }
    .site-nav a::after { bottom: 8px; right: auto; width: 34px; }
    .header-actions .btn { display: none; }
    .menu-toggle { display: inline-grid; }
    .trust-grid { grid-template-columns: repeat(2, 1fr); }
    .trust-item:nth-child(3)::before { display: none; }
    .trust-item:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
    .bento-card--wide, .bento-card--narrow, .bento-card--third { grid-column: span 6; }
    .case-grid { grid-template-columns: 1fr; }
    .download-grid { grid-template-columns: 1fr; }
    .about-intro { grid-template-columns: 1fr; }
    .story-card { grid-template-columns: 1fr; }
    .story-visual { min-height: 390px; }
    .cta-panel { grid-template-columns: 1fr; }
    .cta-actions { justify-content: flex-start; }
    .legal-shell { grid-template-columns: 1fr; }
    .legal-toc { position: static; padding: 18px 20px; border: 1px solid var(--line); border-radius: 14px; background: var(--white); }
    .legal-toc nav { grid-template-columns: repeat(2, 1fr); }
    .footer-main { grid-template-columns: 1fr 1fr; }
    .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 620px) {
    :root { --gutter: 18px; }
    .header-inner { min-height: 70px; }
    .brand-copy span { display: none; }
    .brand-mark { width: 34px; height: 34px; }
    .site-nav { inset-block-start: 70px; }
    .lang-switch { min-width: 64px; height: 38px; padding-inline: 10px; }
    .menu-toggle { width: 38px; height: 38px; }
    .hero { padding-top: 58px; }
    .hero h1 { font-size: clamp(45px, 14vw, 64px); }
    .hero-actions .btn { width: 100%; }
    .hero-art { min-height: 390px; }
    .hero-caption { left: 2px; right: 2px; bottom: 0; max-width: none; }
    .trust-grid { grid-template-columns: 1fr; }
    .trust-item + .trust-item::before { display: none; }
    .trust-item:nth-child(-n+3) { border-bottom: 1px solid var(--line); }
    .bento { grid-template-columns: 1fr; }
    .bento-card--wide, .bento-card--narrow, .bento-card--third { grid-column: auto; min-height: 270px; }
    .bento-art { width: 42%; opacity: .76; }
    .editorial-visual, .editorial-visual img { min-height: 390px; }
    .platform-grid { grid-template-columns: 1fr; }
    .faq-answer-inner { padding-right: 0; }
    .cta-actions .btn { width: 100%; }
    .download-card { grid-template-columns: 1fr; }
    .download-art { display: none; }
    .steps { grid-template-columns: 1fr; }
    .step { min-height: auto; }
    .step::before { margin-bottom: 30px; }
    .value-grid { grid-template-columns: 1fr; }
    .value-item + .value-item::before { display: none; }
    .value-item:nth-child(-n+3) { border-bottom: 1px solid var(--line); }
    .contact-grid { grid-template-columns: 1fr; }
    .legal-toc nav { grid-template-columns: 1fr; }
    .footer-main { grid-template-columns: 1fr; }
    .footer-brand { grid-column: auto; }
    .footer-bottom { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; animation: none !important; }
}

@media print {
    .site-header, .site-footer, .legal-toc, .btn, .toast { display: none !important; }
    body { background: #fff; color: #000; font-size: 11pt; }
    .legal-shell { display: block; padding: 0; }
    .legal-section { break-inside: avoid; }
    .legal-content { max-width: none; }
}