:root {
    --ink: #101111;
    --muted: #59615e;
    --line: #dce3df;
    --paper: #fbfcfa;
    --surface: #fff;
    --green: #0c8f62;
    --coral: #e65b45;
    --gold: #d49b19;
}

* { box-sizing: border-box; }
body {
    margin: 0;
    color: var(--ink);
    background: var(--paper);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", Arial, sans-serif;
    line-height: 1.65;
}
a { color: inherit; text-decoration: none; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 13px 14px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
th { background: #eef4f1; }
input, textarea, select {
    width: 100%;
    margin-top: 7px;
    padding: 12px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #fff;
    font: inherit;
}
label { display: block; color: var(--muted); font-weight: 700; }
button, .solid-btn, .ghost-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 42px;
    padding: 0 18px;
    border: 1px solid var(--ink);
    border-radius: 8px;
    font-weight: 800;
    cursor: pointer;
}
button, .solid-btn { color: #fff; background: var(--ink); }
.ghost-btn { color: var(--ink); background: transparent; }
.large { min-height: 50px; padding: 0 24px; }
.brand { font-weight: 900; font-size: 20px; }
.brand span, .metrics strong { color: var(--green); }
.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    padding: 18px 6vw;
    background: rgba(251, 252, 250, .92);
    border-bottom: 1px solid var(--line);
    backdrop-filter: blur(14px);
}
.main-nav, .header-actions, .hero-actions, .site-footer > div:last-child {
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
}
.main-nav a { color: var(--muted); }
.hero {
    min-height: 76vh;
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(360px, 44vw);
    align-items: center;
    gap: 5vw;
    padding: 56px 6vw 36px;
}
.hero-copy h1 {
    max-width: 760px;
    margin: 0 0 18px;
    font-size: clamp(42px, 7vw, 86px);
    line-height: 1;
    letter-spacing: 0;
}
.hero-copy > p:not(.eyebrow) { max-width: 650px; color: var(--muted); font-size: 19px; }
.hero-image, .workflow img {
    width: 100%;
    aspect-ratio: 4 / 3;
    object-fit: cover;
    border: 1px solid var(--line);
    border-radius: 8px;
}
.eyebrow { color: var(--coral); font-size: 13px; font-weight: 900; text-transform: uppercase; }
.metrics { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 28px; }
.metrics span, .model-card, .feature-grid article, .stats-grid article, .api-key-box, .table-wrap, .form-panel, .auth-panel {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 8px;
}
.metrics span { padding: 12px 14px; color: var(--muted); }
.band, .workflow, .page-wrap, .auth-wrap { padding: 72px 6vw; }
.section-title, .page-head, .admin-head { max-width: 780px; margin-bottom: 30px; }
h1, h2, h3 { line-height: 1.18; letter-spacing: 0; }
.section-title h2, .page-head h1, .admin-head h1 { margin: 0; font-size: clamp(32px, 5vw, 54px); }
.feature-grid, .model-grid, .stats-grid, .doc-grid, .form-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
}
.form-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.feature-grid article, .model-card, .stats-grid article, .api-key-box, .table-wrap, .form-panel, .auth-panel { padding: 22px; }
.stats-grid article span { display: block; color: var(--muted); }
.stats-grid article strong { display: block; margin-top: 6px; font-size: 30px; }
.workflow, .two-col { display: grid; grid-template-columns: minmax(0, .9fr) minmax(0, 1fr); gap: 44px; align-items: center; }
.badge { display: inline-flex; padding: 4px 10px; border-radius: 8px; color: #fff; background: var(--green); font-size: 13px; }
.docs pre {
    overflow-x: auto;
    padding: 18px;
    border-radius: 8px;
    color: #f4f7f5;
    background: #161a18;
}
.doc-block { margin-top: 42px; }
.doc-table { overflow: hidden; border: 1px solid var(--line); border-radius: 8px; background: #fff; }
.steps { padding-left: 22px; }
.auth-wrap { min-height: 70vh; display: grid; place-items: center; }
.auth-panel { width: min(460px, 100%); }
.auth-panel label, .form-panel label { margin-top: 14px; }
.auth-panel p a { color: var(--green); font-weight: 800; }
.flash { margin: 18px 6vw 0; padding: 12px 16px; border: 1px solid #aad5be; border-radius: 8px; background: #edf8f2; }
.flash.error, .form-error { border-color: #efb0a5; color: #9c2f20; background: #fff1ef; }
.site-footer {
    display: flex;
    justify-content: space-between;
    gap: 20px;
    padding: 34px 6vw;
    color: var(--muted);
    border-top: 1px solid var(--line);
}
.api-key-box code { display: block; overflow-x: auto; padding: 14px; border-radius: 8px; background: #eef4f1; }
.wide { margin-bottom: 24px; }
.check-line { display: flex; align-items: center; gap: 8px; color: var(--ink); }
.check-line input { width: auto; margin: 0; }
.actions { display: flex; gap: 10px; align-items: center; }
.actions a { color: var(--green); font-weight: 800; }
.actions button { min-height: 34px; padding: 0 10px; }
.admin-body { display: grid; grid-template-columns: 260px minmax(0, 1fr); min-height: 100vh; }
.admin-sidebar {
    position: sticky;
    top: 0;
    height: 100vh;
    padding: 24px;
    background: #111613;
    color: #f4f7f5;
}
.admin-sidebar nav { display: grid; gap: 8px; margin: 32px 0; }
.admin-sidebar nav a {
    padding: 11px 12px;
    border-radius: 8px;
    color: #dce3df;
}
.admin-sidebar nav a:hover { background: #1f2a24; }
.admin-sidebar button { width: 100%; border-color: #334239; background: #243127; }
.admin-main { padding: 36px; min-width: 0; }
.admin-login { background: #111613; }
.admin-login .auth-panel { border-color: #26352d; }

@media (max-width: 900px) {
    .site-header, .site-footer { align-items: flex-start; flex-direction: column; }
    .hero, .workflow, .two-col, .admin-body { grid-template-columns: 1fr; }
    .hero { min-height: auto; }
    .feature-grid, .model-grid, .stats-grid, .doc-grid, .form-grid { grid-template-columns: 1fr; }
    .admin-sidebar { position: static; height: auto; }
    .admin-main { padding: 24px 6vw; }
}