/* ============================================================
   birth-certificate-guide · 出生医学证明办理指南
   官方证件办理指南风（bcg-）：政务蓝 + 朱红 + 米色 + 墨黑
   ============================================================ */
.bcg-page {
    --bcg-blue: #2b5fa7;
    --bcg-blue-deep: #1a3d72;
    --bcg-blue-soft: rgba(43, 95, 167, 0.12);
    --bcg-red: #c83c23;
    --bcg-red-deep: #8b2816;
    --bcg-red-soft: rgba(200, 60, 35, 0.12);
    --bcg-beige: #f7f1e4;
    --bcg-paper: #ffffff;
    --bcg-paper-deep: #fdf9f0;
    --bcg-ink: #1a1a1a;
    --bcg-muted: #6b6658;
    --bcg-line: #e4ddcf;
    --bcg-line-strong: #c6bca6;
    --bcg-shadow: 0 8px 24px rgba(26, 61, 114, 0.08);
    color: var(--bcg-ink);
    font-size: 15px; line-height: 1.75;
}

[data-theme="dark"] .bcg-page {
    --bcg-blue: #5b8cd4;
    --bcg-blue-deep: #94b4ec;
    --bcg-blue-soft: rgba(91, 140, 212, 0.16);
    --bcg-red: #e06c57;
    --bcg-red-deep: #f09a87;
    --bcg-red-soft: rgba(224, 108, 87, 0.16);
    --bcg-beige: #1f1d18;
    --bcg-paper: #222222;
    --bcg-paper-deep: #2a2a26;
    --bcg-ink: #e8e4dc;
    --bcg-muted: #a0998a;
    --bcg-line: #38352c;
    --bcg-line-strong: #4a473c;
    --bcg-shadow: 0 8px 24px rgba(0, 0, 0, 0.45);
}

.bcg-page h1, .bcg-page h2, .bcg-page h3 { line-height: 1.35; }
.bcg-page b, .bcg-page strong { color: var(--bcg-blue-deep); }

/* Hero */
.bcg-hero {
    display: grid;
    grid-template-columns: minmax(0, 1.4fr) minmax(220px, 0.8fr) minmax(220px, 0.7fr);
    gap: 22px 28px;
    align-items: center;
    padding: 30px 32px 26px;
    margin-bottom: 26px;
    border: 1px solid var(--bcg-line);
    border-radius: 24px;
    background:
        radial-gradient(90% 120% at 100% 0%, var(--bcg-red-soft), transparent 55%),
        radial-gradient(70% 100% at 0% 100%, var(--bcg-blue-soft), transparent 55%),
        var(--bcg-paper);
    box-shadow: var(--bcg-shadow);
}
.bcg-kicker { display: inline-block; padding: 5px 14px; margin-bottom: 12px; border-radius: 8px; background: var(--bcg-blue-soft); color: var(--bcg-blue-deep); font-size: 12px; font-weight: 800; letter-spacing: 0.14em; }
.bcg-hero h1 { margin: 0 0 10px; font-size: clamp(26px, 3.4vw, 38px); font-weight: 900; }
.bcg-hero-sub { margin: 0 0 14px; max-width: 60ch; color: var(--bcg-muted); font-size: 15px; }
.bcg-hero-chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 0; padding: 0; list-style: none; }
.bcg-hero-chips li { padding: 5px 13px; border-radius: 999px; border: 1px solid var(--bcg-line-strong); background: var(--bcg-paper-deep); color: var(--bcg-muted); font-size: 12px; font-weight: 700; }

/* Document visual (unique A4 birth cert) */
.bcg-hero-doc { display: grid; place-items: center; }
.bcg-doc-paper {
    width: 220px; height: 160px;
    background: var(--bcg-paper-deep);
    border: 1px solid var(--bcg-line-strong);
    border-radius: 4px;
    padding: 14px 16px;
    position: relative;
    box-shadow:
        0 2px 6px rgba(0,0,0,0.08),
        0 8px 24px rgba(43,95,167,0.15);
    transform: rotate(-2deg);
}
.bcg-doc-stamp { font-size: 14px; font-weight: 900; color: var(--bcg-blue-deep); letter-spacing: 0.12em; text-align: center; border-bottom: 2px solid var(--bcg-blue); padding-bottom: 6px; margin-bottom: 12px; }
.bcg-doc-seal {
    position: absolute; bottom: 14px; right: 14px;
    width: 48px; height: 48px; border: 2px solid var(--bcg-red); border-radius: 50%;
    opacity: 0.6;
}
.bcg-doc-seal::after { content: '专用章'; position: absolute; inset: 0; display: grid; place-items: center; font-size: 9px; font-weight: 800; color: var(--bcg-red); letter-spacing: 0.1em; transform: rotate(-15deg); }
.bcg-doc-lines { display: grid; gap: 8px; }
.bcg-doc-line { height: 8px; background: var(--bcg-line); border-radius: 2px; }
.bcg-doc-line.bcg-line-short { width: 60%; }

.bcg-hero-readout { display: grid; gap: 5px; padding: 18px 20px; border: 1px solid var(--bcg-line-strong); border-radius: 14px; border-top: 4px solid var(--bcg-red); background: var(--bcg-paper-deep); }
.bcg-readout-label { font-size: 11px; font-weight: 800; letter-spacing: 0.14em; color: var(--bcg-muted); text-transform: uppercase; }
.bcg-readout-num { font-size: 22px; font-weight: 900; line-height: 1.3; color: var(--bcg-blue-deep); font-variant-numeric: tabular-nums; }
.bcg-readout-avg { font-size: 13px; font-weight: 700; color: var(--bcg-muted); }

/* Tab nav */
.bcg-nav { display: flex; gap: 6px; margin-bottom: 22px; padding: 6px; border: 1px solid var(--bcg-line-strong); border-radius: 14px; background: var(--bcg-paper-deep); overflow-x: auto; }
.bcg-nav-btn { padding: 10px 18px; border: none; border-radius: 10px; background: transparent; color: var(--bcg-muted); font-size: 13px; font-weight: 800; cursor: pointer; transition: background 0.15s ease, color 0.15s ease; white-space: nowrap; }
.bcg-nav-btn:hover { color: var(--bcg-blue-deep); }
.bcg-nav-btn.is-active { background: var(--bcg-blue-deep); color: #fff; box-shadow: 0 2px 8px rgba(26,61,114,0.25); }

/* Flow cards */
.bcg-flows { margin-bottom: 26px; }
.bcg-flow-card { padding: 22px 24px; border: 1px solid var(--bcg-line); border-radius: 18px; background: var(--bcg-paper); box-shadow: var(--bcg-shadow); display: none; }
.bcg-flow-card.is-active { display: block; }
.bcg-flow-head { margin-bottom: 18px; padding-bottom: 14px; border-bottom: 2px solid var(--bcg-blue); }
.bcg-flow-head h3 { margin: 0 0 4px; font-size: 20px; font-weight: 900; }
.bcg-flow-head p { margin: 0; font-size: 13.5px; color: var(--bcg-muted); }

.bcg-flow-body { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.bcg-flow-body h4 { margin: 0 0 8px; font-size: 14px; font-weight: 900; color: var(--bcg-blue-deep); }
.bcg-flow-body ul { margin: 0; padding-left: 18px; font-size: 13px; color: var(--bcg-muted); line-height: 1.9; }
.bcg-flow-body li b { color: var(--bcg-red-deep); }

.bcg-flow-steps { margin-top: 16px; padding: 16px; border-radius: 12px; background: var(--bcg-paper-deep); }
.bcg-flow-steps h4 { margin: 0 0 12px; font-size: 14px; font-weight: 900; color: var(--bcg-blue-deep); }
.bcg-step-list { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 10px; }
.bcg-step-item { display: flex; gap: 10px; align-items: flex-start; padding: 10px 12px; border-radius: 8px; background: var(--bcg-paper); border: 1px solid var(--bcg-line); }
.bcg-step-no { flex: none; width: 24px; height: 24px; display: grid; place-items: center; border-radius: 50%; background: var(--bcg-blue-deep); color: #fff; font-size: 12px; font-weight: 900; }
.bcg-step-text { font-size: 12.5px; color: var(--bcg-muted); line-height: 1.6; }

.bcg-note { padding: 12px 14px; margin-top: 14px; border-radius: 8px; background: var(--bcg-blue-soft); border-left: 4px solid var(--bcg-blue); font-size: 13px; color: var(--bcg-blue-deep); font-weight: 600; line-height: 1.8; }
.bcg-note.is-warn { background: var(--bcg-red-soft); border-left-color: var(--bcg-red); color: var(--bcg-red-deep); }

/* Section head */
.bcg-section-head { margin-bottom: 16px; }
.bcg-section-kicker { font-size: 11px; font-weight: 900; letter-spacing: 0.18em; color: var(--bcg-blue-deep); }
.bcg-section-head h2 { margin: 4px 0 4px; font-size: 22px; font-weight: 900; }

/* Checklist tool */
.bcg-checklist-tool { margin-bottom: 26px; padding: 22px 24px; border-radius: 18px; background: var(--bcg-paper); border: 1px solid var(--bcg-line); box-shadow: var(--bcg-shadow); }
.bcg-tool-card { padding: 16px; border-radius: 12px; background: var(--bcg-paper-deep); border: 1px solid var(--bcg-line); }
.bcg-tool-row { display: flex; gap: 14px; align-items: center; margin-bottom: 12px; }
.bcg-tool-label { flex: none; width: 140px; font-size: 13px; font-weight: 800; color: var(--bcg-muted); }
.bcg-select-wrap { flex: 1; position: relative; }
.bcg-input { width: 100%; padding: 10px 12px; border: 1.5px solid var(--bcg-line-strong); border-radius: 10px; background: var(--bcg-paper); color: var(--bcg-ink); font-size: 14px; font-weight: 600; outline: none; transition: border-color 0.15s ease; }
.bcg-input:focus { border-color: var(--bcg-blue); box-shadow: 0 0 0 3px rgba(43,95,167,0.15); }
select.bcg-input { padding-right: 28px; appearance: none; background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'><path d='M1 1l5 5 5-5' stroke='%236b6658' stroke-width='1.5' fill='none' stroke-linecap='round'/></svg>"); background-repeat: no-repeat; background-position: right 10px center; }
.bcg-actions { display: flex; gap: 10px; margin-top: 10px; }
.bcg-btn { padding: 10px 22px; border: 1.5px solid var(--bcg-line-strong); border-radius: 10px; background: var(--bcg-paper); color: var(--bcg-ink); font-size: 13.5px; font-weight: 800; cursor: pointer; transition: transform 0.12s ease, border-color 0.12s ease; }
.bcg-btn:hover { transform: translateY(-1px); border-color: var(--bcg-blue); }
.bcg-btn--primary { border: none; background: var(--bcg-blue-deep); color: #fff; box-shadow: 0 4px 14px rgba(26,61,114,0.3); }

.bcg-checklist { margin-top: 14px; padding: 16px; border-radius: 10px; background: var(--bcg-paper); border: 2px dashed var(--bcg-blue); }
.bcg-checklist h4 { margin: 0 0 10px; font-size: 14px; font-weight: 900; color: var(--bcg-blue-deep); }
.bcg-checklist h5 { margin: 12px 0 6px; font-size: 12.5px; font-weight: 800; color: var(--bcg-muted); letter-spacing: 0.04em; text-transform: uppercase; }
.bcg-checklist ul { margin: 0; padding-left: 18px; font-size: 13px; color: var(--bcg-ink); line-height: 1.9; }
.bcg-checklist ul li { margin-bottom: 2px; }

/* Relation */
.bcg-relation { margin-bottom: 26px; }
.bcg-relation-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.bcg-rel-item { padding: 18px; border: 1px solid var(--bcg-line); border-radius: 14px; background: var(--bcg-paper); box-shadow: var(--bcg-shadow); }
.bcg-rel-item h3 { margin: 0 0 8px; font-size: 15px; font-weight: 900; color: var(--bcg-blue-deep); }
.bcg-rel-item p, .bcg-rel-item ul { margin: 0; font-size: 13px; color: var(--bcg-muted); line-height: 1.8; }
.bcg-rel-item ul { padding-left: 18px; }

/* Timeline */
.bcg-timeline { margin-bottom: 26px; padding: 22px 24px; border: 1px solid var(--bcg-line); border-radius: 18px; background: var(--bcg-paper); box-shadow: var(--bcg-shadow); }
.bcg-timeline-list { position: relative; padding-left: 110px; }
.bcg-timeline-list::before { content: ''; position: absolute; left: 40px; top: 0; bottom: 0; width: 2px; background: var(--bcg-line-strong); }
.bcg-tl-item { position: relative; padding: 8px 0 18px 20px; }
.bcg-tl-item::before { content: ''; position: absolute; left: -72px; top: 14px; width: 12px; height: 12px; border-radius: 50%; background: var(--bcg-blue-deep); border: 3px solid var(--bcg-paper); box-shadow: 0 0 0 2px var(--bcg-line-strong); }
.bcg-tl-time { position: absolute; left: -92px; top: 12px; font-size: 11px; font-weight: 900; color: var(--bcg-red); white-space: nowrap; }
.bcg-tl-time b { color: var(--bcg-blue-deep); }
.bcg-tl-body h4 { margin: 0 0 2px; font-size: 14px; font-weight: 900; }
.bcg-tl-body p { margin: 0; font-size: 12.5px; color: var(--bcg-muted); }

/* Warnings */
.bcg-warnings { margin-bottom: 26px; padding: 22px 24px; border-radius: 18px; background: var(--bcg-red-soft); border: 1px solid rgba(200, 60, 35, 0.25); }
.bcg-warn-list { margin: 10px 0 0; padding-left: 20px; font-size: 13px; color: var(--bcg-red-deep); line-height: 2; }

/* FAQ */
.bcg-faq { margin-bottom: 26px; }

/* Top */
.bcg-top { position: fixed; right: 26px; bottom: 30px; width: 42px; height: 42px; display: grid; place-items: center; border: 1px solid var(--bcg-line-strong); border-radius: 10px; background: var(--bcg-paper); color: var(--bcg-blue-deep); font-size: 17px; font-weight: 900; cursor: pointer; box-shadow: var(--bcg-shadow); opacity: 0; pointer-events: none; transition: opacity 0.25s ease, transform 0.15s ease; z-index: 60; }
.bcg-top.is-show { opacity: 1; pointer-events: auto; }
.bcg-top:hover { transform: translateY(-2px); }

/* Responsive */
@media (max-width: 1080px) {
    .bcg-hero { grid-template-columns: minmax(0, 1fr); }
    .bcg-hero-doc { display: none; }
    .bcg-flow-body { grid-template-columns: minmax(0, 1fr); }
    .bcg-relation-grid { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 640px) {
    .bcg-nav { flex-wrap: wrap; }
    .bcg-timeline-list { padding-left: 80px; }
    .bcg-tl-time { left: -72px; font-size: 10px; }
}