/* ============ 容积率与楼间距测算计算器 · 城建蓝图风 ============ */
.prc-page {
    --prc-navy: #0e2238;
    --prc-blue: #1f6feb;
    --prc-blue-d: #1457c4;
    --prc-ink: #16304b;
    --prc-paper: #f4f8fd;
    --prc-card: #ffffff;
    --prc-line: #dbe6f2;
    --prc-grid: rgba(31,111,235,.10);
    --prc-muted: #5b6b7d;
    --prc-amber: #f5a623;
    --prc-cyan: #1fb6c9;
    --prc-green: #1f9d57;
    --prc-red: #e8553b;
    --prc-shadow: 0 10px 30px rgba(14,34,56,.10);
    color: var(--prc-ink);
    font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", system-ui, sans-serif;
    max-width: 1180px;
    margin: 0 auto;
    padding: 8px 0 40px;
}
.prc-page * { box-sizing: border-box; }
.prc-page h1, .prc-page h2, .prc-page h3 { line-height: 1.25; letter-spacing: -.01em; }

/* ---------- HERO ---------- */
.prc-hero {
    position: relative;
    display: grid;
    grid-template-columns: 1.55fr .95fr;
    gap: 26px;
    background: linear-gradient(135deg, var(--prc-navy), #16395f 70%, #1d4a78);
    border-radius: 22px;
    padding: 34px 34px 30px;
    overflow: hidden;
    box-shadow: var(--prc-shadow);
}
.prc-hero-bg {
    position: absolute; inset: 0;
    background-image:
        linear-gradient(var(--prc-grid) 1px, transparent 1px),
        linear-gradient(90deg, var(--prc-grid) 1px, transparent 1px);
    background-size: 26px 26px;
    mask-image: radial-gradient(circle at 30% 20%, #000 30%, transparent 80%);
    opacity: .8;
}
.prc-hero-copy { position: relative; z-index: 1; color: #eaf2fb; }
.prc-kicker {
    display: inline-block; font-size: 12.5px; letter-spacing: .08em;
    color: #bfe0ff; background: rgba(255,255,255,.10);
    border: 1px solid rgba(255,255,255,.18);
    padding: 5px 12px; border-radius: 999px; margin-bottom: 14px;
}
.prc-hero h1 { font-size: 32px; margin: 0 0 14px; color: #fff; font-weight: 800; }
.prc-hero h1 em { font-style: normal; color: var(--prc-amber); }
.prc-lead { font-size: 15px; line-height: 1.85; color: #d6e6f6; margin: 0 0 16px; }
.prc-lead b { color: #fff; font-weight: 600; }
.prc-tags { list-style: none; display: flex; flex-wrap: wrap; gap: 8px; padding: 0; margin: 0 0 20px; }
.prc-tags li {
    font-size: 12.5px; color: #cfe2f7;
    background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.16);
    padding: 5px 11px; border-radius: 8px;
}
.prc-hero-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 12px; }
.prc-hero-note { font-size: 12.5px; color: #9fc2e6; margin: 0; }

/* buttons */
.prc-btn {
    font: inherit; font-size: 14px; font-weight: 600; cursor: pointer;
    border: 1px solid var(--prc-line); background: #fff; color: var(--prc-ink);
    padding: 10px 16px; border-radius: 10px; transition: transform .12s ease, box-shadow .12s ease, background .12s;
}
.prc-btn:hover { transform: translateY(-1px); box-shadow: 0 6px 16px rgba(14,34,56,.14); }
.prc-btn:active { transform: translateY(0); }
.prc-btn--primary { background: var(--prc-blue); border-color: var(--prc-blue); color: #fff; }
.prc-btn--primary:hover { background: var(--prc-blue-d); }
.prc-btn--ghost { background: transparent; }
.prc-btn--amber { background: var(--prc-amber); border-color: var(--prc-amber); color: #4a2c00; }

/* verdict aside */
.prc-verdict {
    position: relative; z-index: 1;
    background: rgba(255,255,255,.96); border-radius: 16px;
    padding: 18px; box-shadow: 0 12px 30px rgba(0,0,0,.25); align-self: start;
}
.prc-verdict-head { display: flex; justify-content: space-between; align-items: center; font-size: 13px; color: var(--prc-muted); }
.prc-badge { font-size: 12px; font-weight: 700; padding: 3px 9px; border-radius: 999px; background: #eaf1fb; color: var(--prc-blue); }
.prc-verdict-main { display: flex; align-items: baseline; gap: 8px; margin: 10px 0 14px; }
.prc-verdict-num { font-size: 44px; font-weight: 800; color: var(--prc-navy); font-variant-numeric: tabular-nums; line-height: 1; }
.prc-verdict-unit { font-size: 14px; color: var(--prc-muted); }
.prc-verdict-rows { display: grid; gap: 8px; }
.prc-vrow { display: flex; justify-content: space-between; font-size: 13.5px; padding: 7px 10px; background: #f3f7fc; border-radius: 8px; }
.prc-vrow b { font-variant-numeric: tabular-nums; }
.prc-verdict-bar { height: 8px; border-radius: 999px; background: #e4ecf5; margin: 12px 0 8px; overflow: hidden; }
.prc-verdict-bar i { display: block; height: 100%; background: linear-gradient(90deg, var(--prc-cyan), var(--prc-blue)); border-radius: 999px; transition: width .3s ease; }
.prc-verdict-tip { font-size: 12.5px; color: var(--prc-muted); line-height: 1.6; }

/* ---------- panels ---------- */
.prc-panel { background: var(--prc-card); border: 1px solid var(--prc-line); border-radius: 18px; padding: 24px; margin-top: 20px; box-shadow: var(--prc-shadow); }
.prc-panel-head { margin-bottom: 18px; }
.prc-step {
    display: inline-flex; align-items: center; justify-content: center;
    width: 30px; height: 30px; border-radius: 9px;
    background: var(--prc-blue); color: #fff; font-weight: 800; font-size: 13px; margin-right: 10px;
    vertical-align: middle;
}
.prc-panel-head h2 { display: inline; font-size: 20px; color: var(--prc-navy); font-weight: 800; vertical-align: middle; }
.prc-panel-head p { font-size: 13.5px; color: var(--prc-muted); line-height: 1.75; margin: 10px 0 0; }
.prc-panel-head p b { color: var(--prc-ink); font-weight: 600; }
.prc-hint { font-size: 12.5px; color: var(--prc-muted); margin: 12px 0 0; line-height: 1.6; }

/* ---------- form ---------- */
.prc-form-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.prc-field { display: flex; flex-direction: column; gap: 6px; }
.prc-label { font-size: 13px; font-weight: 600; color: var(--prc-ink); }
.prc-label small { font-weight: 400; color: var(--prc-muted); margin-left: 4px; }
.prc-input-row { display: flex; align-items: center; border: 1px solid var(--prc-line); border-radius: 10px; background: #fbfdff; overflow: hidden; }
.prc-input { flex: 1; border: 0; outline: none; background: transparent; padding: 11px 12px; font: inherit; font-size: 15px; color: var(--prc-ink); width: 100%; font-variant-numeric: tabular-nums; }
.prc-input:focus { background: #fff; }
.prc-unit { padding: 0 12px; font-size: 13px; color: var(--prc-muted); background: #eef4fb; align-self: stretch; display: flex; align-items: center; border-left: 1px solid var(--prc-line); }

/* error */
.prc-errbar { margin-top: 16px; background: #fdecea; border: 1px solid #f6c5bd; color: #b3371f; padding: 12px 16px; border-radius: 12px; font-size: 13.5px; line-height: 1.6; }
.prc-errbar[hidden] { display: none; }

/* ---------- metrics ---------- */
.prc-metrics { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.prc-metric { border: 1px solid var(--prc-line); border-radius: 14px; padding: 16px; background: #fbfdff; }
.prc-metric-top { display: flex; justify-content: space-between; align-items: center; }
.prc-metric-name { font-size: 13px; color: var(--prc-muted); }
.prc-metric-tag { font-size: 11.5px; font-weight: 700; padding: 2px 8px; border-radius: 999px; }
.prc-metric-val { font-size: 30px; font-weight: 800; color: var(--prc-navy); margin: 8px 0 4px; font-variant-numeric: tabular-nums; }
.prc-metric-val small { font-size: 14px; font-weight: 600; color: var(--prc-muted); }
.prc-metric-range { font-size: 12.5px; color: var(--prc-muted); line-height: 1.5; }
.tag-ok { background: #e3f6ec; color: var(--prc-green); }
.tag-warn { background: #fdf0d9; color: #b9791a; }
.tag-bad { background: #fde3dd; color: var(--prc-red); }

.prc-cols { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.prc-card-soft { border: 1px solid var(--prc-line); border-radius: 14px; padding: 16px; background: #fbfdff; }
.prc-card-soft h3 { margin: 0 0 12px; font-size: 15px; color: var(--prc-navy); }
.prc-facts { list-style: none; padding: 0; margin: 0; display: grid; gap: 9px; }
.prc-facts li { font-size: 13.5px; color: var(--prc-ink); line-height: 1.6; padding-left: 20px; position: relative; }
.prc-facts li::before { content: "▹"; position: absolute; left: 0; color: var(--prc-blue); }
.prc-facts li b { color: var(--prc-navy); }
.prc-premium { font-size: 15px; color: var(--prc-ink); line-height: 1.7; }
.prc-premium b { color: var(--prc-amber); font-size: 22px; }
.prc-fineprint { font-size: 12px; color: var(--prc-muted); line-height: 1.6; margin: 10px 0 0; }

/* ---------- compare ---------- */
.prc-compare-wrap { overflow-x: auto; }
.prc-compare { width: 100%; border-collapse: collapse; font-size: 13.5px; min-width: 720px; }
.prc-compare th, .prc-compare td { border: 1px solid var(--prc-line); padding: 9px 10px; text-align: center; }
.prc-compare th { background: #eef4fb; color: var(--prc-navy); font-weight: 700; }
.prc-compare input { width: 88px; border: 1px solid var(--prc-line); border-radius: 7px; padding: 6px 8px; font: inherit; font-size: 13px; text-align: center; }
.prc-compare .prc-plan-name { font-weight: 700; color: var(--prc-navy); }
.prc-compare .prc-best { background: #eafaf0; }
.prc-compare .prc-light-ok { color: var(--prc-green); font-weight: 700; }
.prc-compare .prc-light-no { color: var(--prc-red); font-weight: 700; }
.prc-actions { display: flex; flex-wrap: wrap; gap: 10px; }

/* pre / ai box */
.prc-pre { background: #0e2238; color: #d6e6f6; border-radius: 12px; padding: 16px; font-size: 13.5px; line-height: 1.8; white-space: pre-wrap; word-break: break-word; font-family: "SFMono-Regular", Consolas, "PingFang SC", monospace; }
.prc-pre--ai { min-height: 60px; }

/* ---------- faq ---------- */
.prc-faq { display: grid; gap: 10px; }
.prc-faq-item { border: 1px solid var(--prc-line); border-radius: 12px; background: #fbfdff; overflow: hidden; }
.prc-faq-item summary { cursor: pointer; padding: 14px 16px; font-weight: 600; font-size: 14.5px; color: var(--prc-navy); list-style: none; }
.prc-faq-item summary::-webkit-details-marker { display: none; }
.prc-faq-item summary::after { content: "＋"; float: right; color: var(--prc-blue); font-weight: 800; }
.prc-faq-item[open] summary::after { content: "－"; }
.prc-faq-a { padding: 0 16px 16px; font-size: 13.5px; color: var(--prc-ink); line-height: 1.8; }

/* ---------- related ---------- */
.prc-rel-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.prc-rel { display: flex; gap: 12px; align-items: center; text-decoration: none; border: 1px solid var(--prc-line); border-radius: 14px; padding: 14px; background: #fbfdff; transition: transform .12s, box-shadow .12s; }
.prc-rel:hover { transform: translateY(-2px); box-shadow: 0 8px 20px rgba(14,34,56,.12); }
.prc-rel i { font-size: 24px; }
.prc-rel b { display: block; color: var(--prc-navy); font-size: 14px; }
.prc-rel small { color: var(--prc-muted); font-size: 12px; }

/* ---------- comments ---------- */
.prc-comments { margin-top: 22px; }

/* ---------- print sheet ---------- */
.prc-sheet { display: none; }
.prc-sheet.prc-printing { display: block; padding: 20px; background: #fff; color: #111; }
.prc-sheet h2 { font-size: 18px; margin: 0 0 12px; }
.prc-sheet table { width: 100%; border-collapse: collapse; font-size: 13px; }
.prc-sheet th, .prc-sheet td { border: 1px solid #ccc; padding: 7px 8px; text-align: left; }
.prc-sheet th { background: #eef4fb; }

/* ---------- toast ---------- */
.prc-toast { position: fixed; left: 50%; bottom: 28px; transform: translateX(-50%) translateY(20px); background: var(--prc-navy); color: #fff; padding: 11px 20px; border-radius: 10px; font-size: 14px; opacity: 0; pointer-events: none; transition: opacity .2s, transform .2s; z-index: 9999; }
.prc-toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ---------- responsive ---------- */
@media (max-width: 940px) {
    .prc-hero { grid-template-columns: 1fr; }
    .prc-metrics { grid-template-columns: repeat(2, 1fr); }
    .prc-cols, .prc-rel-grid { grid-template-columns: 1fr; }
    .prc-form-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px) {
    .prc-hero { padding: 24px 18px; }
    .prc-hero h1 { font-size: 25px; }
    .prc-panel { padding: 18px 14px; }
    .prc-form-grid { grid-template-columns: 1fr; }
    .prc-metrics { grid-template-columns: 1fr; }
}

/* ============ 深色模式 ============ */
:root[data-theme="dark"] .prc-page {
    --prc-paper: #0c1a2b;
    --prc-card: #12253b;
    --prc-line: #23415f;
    --prc-ink: #e7f0fa;
    --prc-muted: #9fb3c8;
    --prc-shadow: 0 10px 30px rgba(0,0,0,.4);
}
:root[data-theme="dark"] .prc-page .prc-hero { background: linear-gradient(135deg, #0a1726, #112c47 70%, #163a5c); }
:root[data-theme="dark"] .prc-page .prc-field .prc-input-row { background: #0e2034; }
:root[data-theme="dark"] .prc-page .prc-input { color: #e7f0fa; }
:root[data-theme="dark"] .prc-page .prc-metric,
:root[data-theme="dark"] .prc-page .prc-card-soft,
:root[data-theme="dark"] .prc-page .prc-vrow,
:root[data-theme="dark"] .prc-page .prc-rel,
:root[data-theme="dark"] .prc-page .prc-faq-item { background: #0e2034; }
:root[data-theme="dark"] .prc-page .prc-verdict { background: #13283f; }
:root[data-theme="dark"] .prc-page .prc-verdict-num,
:root[data-theme="dark"] .prc-page .prc-metric-val { color: #fff; }
:root[data-theme="dark"] .prc-page .prc-btn { background: #16304b; color: #e7f0fa; border-color: #23415f; }
:root[data-theme="dark"] .prc-page .prc-btn--primary { background: var(--prc-blue); color: #fff; border-color: var(--prc-blue); }
:root[data-theme="dark"] .prc-page .prc-btn--amber { background: var(--prc-amber); color: #4a2c00; }
:root[data-theme="dark"] .prc-page .prc-compare th { background: #163251; color: #cfe2f7; }
:root[data-theme="dark"] .prc-page .prc-unit { background: #16304b; }
:root[data-theme="dark"] .prc-page .prc-pre { background: #06101c; }
:root[data-theme="dark"] .prc-page .prc-badge { background: #163251; color: #9fd0ff; }