:root {
    --bg: #f3f5f8;
    --ink: #121826;
    --muted: #5b6573;
    --card: #ffffff;
    --line: #dce3ea;
    --accent: #1b4f72;
    --accent-soft: #2e86ab;
    --shadow: 0 10px 30px rgba(18, 32, 48, 0.06);
}

* { box-sizing: border-box; }

body {
    margin: 0;
    min-height: 100vh;
    font-family: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    color: var(--ink);
    background:
        linear-gradient(180deg, #e8eef3 0%, var(--bg) 220px);
}

.page {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.topbar, main, footer, .flash-wrap {
    width: min(1120px, calc(100% - 40px));
    margin: 0 auto;
}

body.is-narrow .topbar,
body.is-narrow main,
body.is-narrow footer,
body.is-narrow .flash-wrap {
    width: min(440px, calc(100% - 40px));
}

.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 20px 0;
    border-bottom: 1px solid var(--line);
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    color: inherit;
    text-decoration: none;
}

.mark {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    display: grid;
    place-items: center;
    color: #e8f1f6;
    background: var(--accent);
}

.brand-text {
    display: grid;
    line-height: 1.15;
}

.brand-text strong {
    font-size: 15px;
    letter-spacing: 0;
}

.brand-text small {
    color: var(--muted);
    font-size: 11px;
    letter-spacing: 0.08em;
}

.nav {
    display: flex;
    align-items: center;
    gap: 18px;
    color: var(--muted);
    font-size: 14px;
}

.nav a, .nav button {
    color: inherit;
    text-decoration: none;
    background: none;
    border: 0;
    padding: 0;
    font: inherit;
    cursor: pointer;
}

.nav a:hover, .nav button:hover, .nav a.is-active {
    color: var(--accent);
}

.nav-form { margin: 0; }

main {
    flex: 1;
    padding: 28px 0 56px;
}

.hero, .card, .panel, .auth-card, .empty, .table-wrap, .steps article, .stat {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.hero, .auth-card, .empty {
    padding: 40px;
}

.eyebrow {
    margin: 0 0 10px;
    color: var(--accent-soft);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.18em;
}

.kicker {
    margin: 0 0 10px;
    color: var(--accent);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.08em;
}

h1 {
    margin: 0 0 14px;
    font-size: clamp(32px, 5vw, 48px);
    line-height: 1.15;
    letter-spacing: -0.03em;
}

h2, h3 {
    margin: 0 0 10px;
    font-size: 18px;
}

.lead {
    max-width: 40em;
    margin: 0;
    color: var(--muted);
    font-size: 16px;
    line-height: 1.75;
}

.lead.compact, .muted, .feedback {
    color: var(--muted);
    line-height: 1.7;
}

.hero-actions, .console-head, .card-head, .pager, .filters {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 12px;
}

.hero-actions { margin-top: 24px; }

.console-head {
    justify-content: space-between;
    margin-bottom: 20px;
}

.console-head h1 {
    font-size: 28px;
    letter-spacing: -0.03em;
}

.grid-3, .stats, .detail-grid, .steps {
    display: grid;
    gap: 16px;
}

.grid-3, .steps {
    grid-template-columns: repeat(3, 1fr);
    margin: 20px 0;
}

.stats {
    grid-template-columns: repeat(4, 1fr);
    margin: 0 0 16px;
}

.detail-grid {
    grid-template-columns: 300px 1fr;
    align-items: start;
}

.card, .stat { padding: 22px; }
.panel { padding: 24px; display: grid; gap: 20px; grid-template-columns: 1fr 1fr; }
.stack { display: grid; gap: 16px; }

.steps article { padding: 22px; }
.steps span {
    display: inline-grid;
    place-items: center;
    width: 28px;
    height: 28px;
    margin-bottom: 12px;
    border-radius: 8px;
    background: #e8f1f6;
    color: var(--accent);
    font-size: 13px;
    font-weight: 700;
}

.stat span {
    display: block;
    color: var(--muted);
    font-size: 13px;
}

.stat strong {
    display: block;
    margin-top: 8px;
    font-size: 28px;
    letter-spacing: -0.04em;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 40px;
    padding: 0 16px;
    border-radius: 8px;
    border: 1px solid var(--line);
    text-decoration: none;
    color: inherit;
    background: transparent;
    cursor: pointer;
    font: inherit;
}

.btn-primary {
    color: #f4f8fb;
    border-color: transparent;
    background: var(--accent);
}

.btn-ghost { background: #fff; }

.form, .filters { display: grid; gap: 12px; }
.filters { grid-template-columns: 1fr 160px 120px auto; margin-bottom: 16px; }

label { display: grid; gap: 6px; font-size: 13px; color: var(--muted); }

input, select, textarea {
    width: 100%;
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 10px 12px;
    font: inherit;
    color: var(--ink);
    background: #fff;
}

.code-block, .bubble-body {
    margin: 0;
    overflow: auto;
    white-space: pre-wrap;
    word-break: break-word;
    font-family: Consolas, "Sarasa Mono SC", "Segoe UI Mono", monospace;
    font-size: 12.5px;
    line-height: 1.7;
}

.code-block {
    padding: 16px;
    border-radius: 10px;
    background: #15202b;
    color: #d7e6ef;
}

.code-block.small { max-height: 220px; }

.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th, .data-table td {
    padding: 13px 16px;
    text-align: left;
    border-bottom: 1px solid var(--line);
    vertical-align: top;
}

.data-table th {
    color: var(--muted);
    font-weight: 600;
    font-size: 12px;
    letter-spacing: 0.04em;
}

.row-title {
    color: inherit;
    font-weight: 600;
    text-decoration: none;
}

.row-title:hover { color: var(--accent); }

.clamp {
    max-width: 280px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.badge {
    display: inline-flex;
    padding: 3px 8px;
    border-radius: 6px;
    font-size: 12px;
    background: #e8eef3;
}

.badge-new { background: #e7f0f7; color: var(--accent); }
.badge-reviewed { background: #e7f2ea; color: #215e36; }
.badge-useful { background: #e4f4ef; color: #0f6b4c; }
.badge-archived { background: #eef0f2; color: var(--muted); }

.meta { display: grid; gap: 10px; margin: 0 0 16px; }
.meta div { display: grid; gap: 2px; }
.meta dt { color: var(--muted); font-size: 12px; }
.meta dd { margin: 0; font-size: 14px; }

.chat { display: grid; gap: 10px; }
.bubble {
    padding: 12px 14px;
    border-radius: 10px;
    background: #f6f8fb;
    border: 1px solid var(--line);
}
.bubble.role-assistant, .bubble.role-system { background: #eef4f8; }
.bubble-role {
    display: block;
    margin-bottom: 6px;
    color: var(--accent);
    font-size: 11px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.flash-wrap { padding-top: 12px; }
.flash {
    margin: 0 0 12px;
    padding: 10px 14px;
    border-radius: 8px;
    background: #e4f4ef;
}
.flash-error { background: #f8e6e4; }

.back, footer a { color: var(--muted); text-decoration: none; }
.back:hover, footer a:hover { color: var(--accent); }

footer {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 20px;
    justify-content: center;
    padding: 0 0 24px;
    color: var(--muted);
    font-size: 12px;
}

.pager { justify-content: center; margin-top: 16px; color: var(--muted); }
.pager a { color: var(--accent); text-decoration: none; }

code {
    font-family: Consolas, "Sarasa Mono SC", monospace;
    font-size: 0.92em;
    padding: 0 4px;
    border-radius: 4px;
    background: #e8eef3;
}

.docs-hero {
    margin-bottom: 24px;
}

.docs-layout {
    display: grid;
    grid-template-columns: 220px 1fr;
    gap: 28px;
    align-items: start;
}

.docs-toc {
    position: sticky;
    top: 16px;
    display: grid;
    gap: 8px;
    padding: 16px;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 12px;
}

.docs-toc p {
    margin: 0 0 4px;
    color: var(--muted);
    font-size: 12px;
    letter-spacing: 0.08em;
}

.docs-toc a {
    color: var(--ink);
    text-decoration: none;
    font-size: 13px;
    line-height: 1.4;
}

.docs-toc a:hover { color: var(--accent); }

.docs-main { display: grid; gap: 20px; }

.docs-section {
    padding: 24px;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.docs-section h2 {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px;
}

.docs-section h3 {
    margin: 18px 0 10px;
    font-size: 14px;
    color: var(--muted);
}

.docs-section .code-block { margin-top: 8px; }

.method {
    display: inline-flex;
    align-items: center;
    min-width: 58px;
    justify-content: center;
    padding: 2px 8px;
    border-radius: 6px;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.06em;
    color: #fff;
}

.method-get { background: #1f7a4d; }
.method-post { background: #1b4f72; }
.method-patch { background: #9a5b12; }
.method-delete { background: #8f2d2d; }

.status {
    display: inline-flex;
    margin-left: 8px;
    padding: 1px 6px;
    border-radius: 4px;
    background: #e4f4ef;
    color: #0f6b4c;
    font-size: 12px;
}

@media (max-width: 900px) {
    .grid-3, .stats, .detail-grid, .panel, .filters, .steps, .docs-layout {
        grid-template-columns: 1fr;
    }
    .docs-toc { position: static; }
    .hero, .auth-card, .empty { padding: 28px 20px; }
}