:root {
    --blue: #0b63ce;
    --blue-strong: #084b9c;
    --blue-soft: #e8f1fc;
    --ink: #17202b;
    --ink-soft: #435365;
    --line: #cbd5e1;
    --line-strong: #94a3b8;
    --paper: #fbfcfe;
    --panel: #ffffff;
    --wash: #f2f6fa;
    --green: #176b43;
    --amber: #8a5700;
    --red: #a82a2a;
    --max: 1180px;
    --radius: 5px;
    --shadow: 0 10px 30px rgba(23, 32, 43, .08);
    --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
    --sans: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }

html { min-width: 0; scroll-behavior: smooth; }

body {
    margin: 0;
    color: var(--ink);
    background:
        linear-gradient(rgba(11, 99, 206, .045) 1px, transparent 1px),
        linear-gradient(90deg, rgba(11, 99, 206, .045) 1px, transparent 1px),
        var(--paper);
    background-size: 32px 32px;
    font: 16px/1.65 var(--sans);
    -webkit-font-smoothing: antialiased;
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    background: linear-gradient(90deg, rgba(255, 255, 255, .72), transparent 18%, transparent 82%, rgba(255, 255, 255, .72));
    z-index: -1;
}

a { color: var(--blue-strong); text-underline-offset: 3px; }
a:hover { color: var(--blue); }
button, input, select, textarea { font: inherit; }
button { cursor: pointer; }

.shell { width: min(var(--max), calc(100% - 40px)); margin: 0 auto; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
.skip-link { position: fixed; left: 12px; top: -60px; z-index: 100; padding: 9px 14px; color: #fff; background: var(--blue-strong); }
.skip-link:focus { top: 12px; }
.mono { font-family: var(--mono); letter-spacing: .02em; }
.muted { color: var(--ink-soft); }
.eyebrow { margin: 0 0 12px; color: var(--blue-strong); font: 700 12px/1.2 var(--mono); letter-spacing: .12em; text-transform: uppercase; }
.section-kicker { margin: 0 0 10px; font-size: 14px; font-weight: 700; color: var(--blue-strong); }

.site-header { position: sticky; top: 0; z-index: 20; border-bottom: 1px solid var(--line); background: rgba(251, 252, 254, .96); backdrop-filter: blur(12px); }
.header-inner { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 11px; color: var(--ink); font-weight: 800; font-size: 20px; text-decoration: none; letter-spacing: -.02em; }
.brand:hover { color: var(--ink); }
.brand-mark { display: inline-grid; place-items: center; width: 35px; height: 35px; border-radius: 5px; color: #fff; background: var(--blue); font: 800 12px/1 var(--mono); letter-spacing: -.08em; box-shadow: 4px 4px 0 rgba(11, 99, 206, .2); }
.site-nav { display: flex; align-items: center; gap: 24px; }
.site-nav a { padding: 7px 0; color: var(--ink-soft); font-size: 14px; font-weight: 650; text-decoration: none; border-bottom: 2px solid transparent; }
.site-nav a:hover, .site-nav a.active { color: var(--blue-strong); border-bottom-color: var(--blue); }
.nav-account { padding: 7px 13px !important; color: #fff !important; background: var(--blue); border: 1px solid var(--blue) !important; border-radius: var(--radius); }
.nav-account:hover, .nav-account.active { color: #fff !important; background: var(--blue-strong); }
.language-toggle, .menu-toggle { border: 1px solid var(--line-strong); border-radius: var(--radius); color: var(--ink); background: var(--panel); }
.language-toggle { min-width: 40px; padding: 7px 10px; font: 700 12px var(--mono); }
.language-toggle:hover { color: var(--blue-strong); border-color: var(--blue); }
.menu-toggle { display: none; padding: 7px 10px; }

main { min-height: 640px; }
.page { padding: 68px 0 92px; }
.page-header { max-width: 760px; margin-bottom: 40px; }
h1, h2, h3, h4 { margin: 0; line-height: 1.18; letter-spacing: -.035em; }
h1 { max-width: 860px; font-size: clamp(2.45rem, 6vw, 5.25rem); }
h2 { font-size: clamp(1.85rem, 3.6vw, 3rem); }
h3 { font-size: 1.2rem; }
h4 { font-size: 1rem; }
.lead { max-width: 690px; margin: 22px 0 0; color: var(--ink-soft); font-size: clamp(1.05rem, 2vw, 1.3rem); }
.small { font-size: 14px; }

.hero { position: relative; padding: 94px 0 78px; border-bottom: 1px solid var(--line); overflow: hidden; }
.hero::after { content: "01 / CLEAR EVIDENCE"; position: absolute; right: max(20px, calc((100% - var(--max)) / 2)); bottom: 26px; color: rgba(11, 99, 206, .38); font: 700 12px var(--mono); letter-spacing: .1em; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.18fr) minmax(300px, .82fr); gap: 62px; align-items: end; }
.hero h1 { margin-top: 8px; }
.hero h1 span { color: var(--blue); }
.hero-copy { max-width: 650px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.hero-note { display: flex; gap: 12px; align-items: center; margin-top: 28px; padding-top: 18px; border-top: 1px solid var(--line); color: var(--ink-soft); font-size: 14px; }
.signal { width: 9px; height: 9px; flex: 0 0 auto; background: var(--green); border-radius: 50%; box-shadow: 0 0 0 4px rgba(23, 107, 67, .12); }
.hero-board { position: relative; padding: 22px; border: 1px solid var(--ink); background: var(--panel); box-shadow: 14px 14px 0 var(--blue-soft); }
.board-label { display: flex; justify-content: space-between; gap: 12px; padding-bottom: 16px; border-bottom: 1px solid var(--line); color: var(--ink-soft); font: 12px var(--mono); }
.board-title { margin: 22px 0; font-size: 1.35rem; }
.board-flow { display: grid; gap: 10px; }
.board-step { display: grid; grid-template-columns: 30px 1fr auto; gap: 10px; align-items: center; padding: 12px 10px; border: 1px solid var(--line); background: var(--wash); }
.board-number { color: var(--blue-strong); font: 700 12px var(--mono); }
.board-step strong { font-size: 14px; }
.board-step span:last-child { color: var(--green); font: 700 12px var(--mono); }

.btn { display: inline-flex; justify-content: center; align-items: center; min-height: 44px; padding: 10px 17px; border: 1px solid transparent; border-radius: var(--radius); font-weight: 700; text-decoration: none; transition: background .16s ease, color .16s ease, border-color .16s ease, transform .16s ease; }
.btn:hover { transform: translateY(-1px); }
.btn-primary { color: #fff; background: var(--blue); border-color: var(--blue); }
.btn-primary:hover { color: #fff; background: var(--blue-strong); border-color: var(--blue-strong); }
.btn-secondary { color: var(--ink); background: var(--panel); border-color: var(--line-strong); }
.btn-secondary:hover { color: var(--blue-strong); border-color: var(--blue); }
.btn-quiet { color: var(--blue-strong); background: transparent; border-color: transparent; }
.btn-danger { color: #fff; background: var(--red); border-color: var(--red); }
.btn:focus-visible, .site-nav a:focus-visible, .brand:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible, summary:focus-visible, .language-toggle:focus-visible, .menu-toggle:focus-visible { outline: 3px solid rgba(11, 99, 206, .35); outline-offset: 3px; }

.section { padding: 76px 0; border-bottom: 1px solid var(--line); }
.section-heading { display: flex; justify-content: space-between; gap: 26px; align-items: end; margin-bottom: 28px; }
.section-heading > p { max-width: 480px; margin: 0; color: var(--ink-soft); }
.grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; }
.card { padding: 22px; border: 1px solid var(--line); background: rgba(255, 255, 255, .92); box-shadow: 0 2px 0 rgba(23, 32, 43, .03); }
.card:hover { border-color: var(--line-strong); }
.card p { margin: 10px 0 0; color: var(--ink-soft); }
.card-index { color: var(--blue); font: 700 12px var(--mono); }
.card-icon { display: inline-grid; place-items: center; width: 38px; height: 38px; margin-bottom: 16px; color: var(--blue-strong); border: 1px solid var(--blue); background: var(--blue-soft); font: 700 13px var(--mono); }
.proof-card { min-height: 170px; }
.proof-card h3 { margin-top: 10px; }
.proof-card p { font-size: 14px; }
.callout { padding: 22px 24px; border-left: 4px solid var(--blue); background: var(--blue-soft); }
.callout p { margin: 0; color: var(--ink); }
.workflow { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.workflow-step { min-height: 170px; padding: 19px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); background: rgba(255, 255, 255, .7); }
.workflow-step .step-num { color: var(--blue); font: 700 12px var(--mono); }
.workflow-step h3 { margin-top: 35px; font-size: 1rem; }
.workflow-step p { margin: 8px 0 0; color: var(--ink-soft); font-size: 14px; }

.product-banner { display: grid; grid-template-columns: 1fr auto; gap: 24px; align-items: center; padding: 26px; border: 1px solid var(--ink); background: var(--ink); color: #fff; }
.product-banner p { max-width: 650px; margin: 10px 0 0; color: #cbd5e1; }
.product-banner .btn-secondary { color: #fff; background: transparent; border-color: #94a3b8; }
.status { display: inline-flex; align-items: center; gap: 7px; padding: 4px 8px; border-radius: 3px; font: 700 11px var(--mono); letter-spacing: .02em; }
.status::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: currentColor; }
.status-available { color: var(--green); background: #e9f6ef; }
.status-review { color: var(--amber); background: #fff5db; }
.status-candidate { color: var(--ink-soft); background: #edf1f5; }
.feature-card { display: flex; flex-direction: column; min-height: 190px; }
.feature-meta { display: flex; flex-wrap: wrap; gap: 7px; margin-top: auto; padding-top: 18px; }
.feature-meta .mono { color: var(--ink-soft); font-size: 12px; }

.plan-card { position: relative; display: flex; flex-direction: column; min-height: 405px; }
.plan-card.is-primary { border-color: var(--blue); box-shadow: 6px 6px 0 var(--blue-soft); }
.plan-card .plan-tag { display: inline-block; margin-bottom: 17px; color: var(--blue-strong); font: 700 11px var(--mono); letter-spacing: .08em; text-transform: uppercase; }
.plan-card h3 { font-size: 1.55rem; }
.plan-card .plan-summary { min-height: 54px; }
.manual-price { display: flex; gap: 10px; align-items: baseline; margin: 20px 0 17px; padding: 14px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); color: var(--ink); font-weight: 750; }
.manual-price span { color: var(--blue-strong); font: 700 12px var(--mono); }
.plan-features { margin: 0 0 22px; padding: 0; list-style: none; color: var(--ink-soft); font-size: 14px; }
.plan-features li { padding: 4px 0; }
.plan-features li::before { content: "—"; margin-right: 8px; color: var(--blue); font-weight: 700; }
.plan-card .btn { margin-top: auto; }

.account-grid { display: grid; grid-template-columns: minmax(0, .78fr) minmax(0, 1.22fr); gap: 20px; align-items: start; }
.account-panel { padding: 26px; border: 1px solid var(--line); background: var(--panel); box-shadow: var(--shadow); }
.account-panel h2 { font-size: 1.6rem; }
.tab-row { display: flex; gap: 5px; margin: 22px 0; border-bottom: 1px solid var(--line); }
.tab { padding: 9px 12px; color: var(--ink-soft); border: 0; border-bottom: 2px solid transparent; background: transparent; font-weight: 700; }
.tab[aria-selected="true"] { color: var(--blue-strong); border-bottom-color: var(--blue); }
.form-stack { display: grid; gap: 14px; }
.field { display: grid; gap: 6px; }
.field label { color: var(--ink); font-size: 14px; font-weight: 700; }
.field input, .field select, .field textarea { width: 100%; padding: 10px 11px; color: var(--ink); border: 1px solid var(--line-strong); border-radius: var(--radius); background: #fff; }
.field input::placeholder { color: #64748b; }
.form-message { min-height: 24px; margin: 0; color: var(--red); font-size: 14px; }
.form-message.success { color: var(--green); }
.account-summary { display: grid; gap: 12px; }
.summary-row { display: flex; justify-content: space-between; gap: 18px; padding: 13px 0; border-bottom: 1px solid var(--line); }
.summary-row span:first-child { color: var(--ink-soft); }
.summary-row strong { text-align: right; }
.empty { padding: 28px; border: 1px dashed var(--line-strong); color: var(--ink-soft); background: var(--wash); }
.account-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }

.tutorial-layout { display: grid; grid-template-columns: minmax(190px, .28fr) minmax(0, .72fr); gap: 30px; align-items: start; }
.tutorial-nav { position: sticky; top: 100px; padding: 17px; border: 1px solid var(--line); background: var(--panel); }
.tutorial-nav h3 { margin-bottom: 13px; font-size: 14px; }
.tutorial-nav a { display: block; padding: 8px 0; font-size: 14px; text-decoration: none; }
.tutorial-article { min-width: 0; padding: 30px clamp(20px, 4vw, 50px); border: 1px solid var(--line); background: var(--panel); box-shadow: var(--shadow); }
.tutorial-article h1 { font-size: clamp(2rem, 4vw, 3.3rem); }
.tutorial-article h2 { margin: 35px 0 12px; font-size: 1.7rem; }
.tutorial-article h3 { margin: 25px 0 9px; }
.tutorial-article p { max-width: 75ch; color: var(--ink-soft); }
.tutorial-article pre { max-width: 100%; overflow-x: auto; padding: 17px; color: #e7eef8; background: #17202b; border-radius: 3px; font: 13px/1.6 var(--mono); }
.tutorial-article code { font-family: var(--mono); }
.tutorial-article :not(pre) > code { padding: 2px 4px; color: var(--blue-strong); background: var(--blue-soft); }
.tutorial-error { padding: 20px; border: 1px solid #efb5b5; color: var(--red); background: #fff4f4; }
.tutorial-loading { color: var(--ink-soft); }

.not-found { padding: 100px 0; text-align: center; }
.not-found h1 { margin: 0 auto; font-size: 3rem; }
.not-found p { color: var(--ink-soft); }
.noscript { margin: 25px auto; padding: 15px; color: var(--red); border: 1px solid #efb5b5; background: #fff4f4; }

.site-footer { border-top: 1px solid var(--line); background: #eef3f8; }
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr; gap: 25px; padding: 38px 0; }
.footer-brand { margin: 0 0 5px; font-weight: 800; }
.footer-grid a { display: block; width: fit-content; margin-top: 6px; font-size: 14px; }
.footer-label { margin: 0 0 9px; color: var(--ink); font: 700 12px var(--mono); letter-spacing: .08em; text-transform: uppercase; }
.footer-bottom { display: flex; justify-content: space-between; gap: 18px; padding: 15px 0 20px; color: var(--ink-soft); border-top: 1px solid var(--line); font-size: 12px; }

@media (max-width: 900px) {
    .hero-grid, .account-grid { grid-template-columns: 1fr; }
    .hero-board { max-width: 620px; }
    .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .workflow { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 700px) {
    .shell { width: min(100% - 28px, var(--max)); }
    .header-inner { min-height: 64px; }
    .menu-toggle { display: inline-block; }
    .site-nav { display: none; position: absolute; top: 63px; left: 0; right: 0; padding: 12px 14px 17px; flex-direction: column; align-items: stretch; gap: 4px; border-bottom: 1px solid var(--line); background: var(--paper); box-shadow: var(--shadow); }
    .site-nav.is-open { display: flex; }
    .site-nav a { padding: 10px 5px; border-bottom: 0; }
    .site-nav a.active { border-left: 3px solid var(--blue); padding-left: 9px; }
    .nav-account { text-align: center; }
    .language-toggle { align-self: flex-start; margin-top: 5px; }
    .page, .hero { padding-top: 52px; }
    .hero { padding-bottom: 60px; }
    .hero h1 { font-size: clamp(2.45rem, 14vw, 4rem); }
    .hero::after { right: 14px; font-size: 10px; }
    .section { padding: 56px 0; }
    .section-heading, .product-banner { display: block; }
    .section-heading > p { margin-top: 13px; }
    .product-banner .btn { margin-top: 20px; }
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
    .workflow { grid-template-columns: 1fr; }
    .workflow-step { min-height: 130px; }
    .workflow-step h3 { margin-top: 25px; }
    .tutorial-layout { grid-template-columns: 1fr; gap: 16px; }
    .tutorial-nav { position: static; }
    .tutorial-article { padding: 24px 18px; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .footer-grid > div:first-child { grid-column: 1 / -1; }
    .footer-bottom { display: block; }
    .footer-bottom .mono { display: block; margin-top: 8px; }
}

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