/* ===== 消防水池 · 图纸剖面工作台 ===== */
.fwt-sheet {
    --ink: #16324a;
    --ink-soft: #5b7185;
    --paper: #f8f6f0;
    --line: #b9c7d4;
    --blue: #0f4c81;
    --dim: #b45309;
    background:
        linear-gradient(0deg, rgba(15, 76, 129, .035) 1px, transparent 1px) 0 0 / 20px 20px,
        linear-gradient(90deg, rgba(15, 76, 129, .035) 1px, transparent 1px) 0 0 / 20px 20px,
        var(--paper);
    border: 1px solid #c9d3dd;
    border-radius: 4px;
    margin-bottom: 26px;
    box-shadow: 0 1px 0 #fff inset, 0 14px 40px rgba(22, 50, 74, .10);
}
.fwt-frame { padding: 22px 22px 6px; }

.fwt-titleblock {
    display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap;
    border-bottom: 2px solid var(--ink); padding-bottom: 14px; margin-bottom: 20px;
}
.fwt-tb-kicker {
    display: inline-block; font-size: 11px; letter-spacing: .14em; text-transform: uppercase;
    color: var(--blue); background: rgba(15, 76, 129, .08); padding: 3px 8px; margin-bottom: 8px;
}
.fwt-titleblock h1 { font-size: 23px; line-height: 1.25; color: var(--ink); margin: 0 0 6px; letter-spacing: .01em; }
.fwt-titleblock p { margin: 0; font-size: 13px; color: var(--ink-soft); }
.fwt-tb-meta { display: flex; gap: 0; margin: 0; border: 1px solid var(--ink); align-self: flex-start; }
.fwt-tb-meta > div { padding: 6px 12px; border-left: 1px solid var(--line); }
.fwt-tb-meta > div:first-child { border-left: 0; }
.fwt-tb-meta dt { font-size: 10px; color: var(--ink-soft); letter-spacing: .08em; }
.fwt-tb-meta dd { margin: 2px 0 0; font-size: 12px; color: var(--ink); font-family: ui-monospace, SFMono-Regular, Consolas, monospace; }

.fwt-work { display: grid; grid-template-columns: 236px minmax(0, 1fr) 300px; gap: 20px; align-items: start; }

/* 参数区 */
.fwt-presets { display: flex; flex-wrap: wrap; gap: 5px; margin-bottom: 14px; }
.fwt-preset {
    font: inherit; font-size: 11px; cursor: pointer; padding: 4px 8px;
    border: 1px solid var(--line); background: #fff; color: var(--ink-soft);
    border-radius: 2px; transition: all .15s;
}
.fwt-preset:hover { border-color: var(--blue); color: var(--blue); }
.fwt-preset.is-on { background: var(--blue); border-color: var(--blue); color: #fff; }

.fwt-group { border: 0; border-top: 1px solid var(--ink); margin: 0 0 16px; padding: 10px 0 0; }
.fwt-group legend {
    font-size: 11px; font-weight: 700; letter-spacing: .06em; color: var(--blue);
    padding: 0 6px 0 0; margin-left: -2px;
}
.fwt-row { display: flex; align-items: center; justify-content: space-between; gap: 8px; padding: 4px 0; }
.fwt-row > span { font-size: 12px; color: var(--ink-soft); display: flex; align-items: baseline; gap: 3px; }
.fwt-row em { font-style: normal; font-size: 10px; color: #94a3b8; }
.fwt-row input, .fwt-row select {
    width: 104px; font: inherit; font-size: 13px; text-align: right;
    padding: 5px 6px; border: 1px solid var(--line); border-radius: 2px;
    background: #fff; color: var(--ink); font-variant-numeric: tabular-nums;
}
.fwt-row select { text-align: left; width: 128px; }
.fwt-row input:focus, .fwt-row select:focus { outline: 2px solid rgba(15, 76, 129, .35); outline-offset: 1px; border-color: var(--blue); }
.fwt-row input.is-bad { border-color: #dc2626; background: #fef2f2; }

/* 画布 */
.fwt-canvas { border: 1px solid var(--line); background: #fff; }
.fwt-canvas-head {
    display: flex; justify-content: space-between; align-items: center;
    padding: 8px 12px; border-bottom: 1px solid var(--line);
    font-size: 11px; color: var(--ink-soft); letter-spacing: .05em;
}
.fwt-scale b { color: var(--ink); font-family: ui-monospace, monospace; }
.fwt-svg { display: block; width: 100%; height: auto; }
.fwt-canvas-foot {
    display: flex; gap: 16px; padding: 8px 12px; border-top: 1px solid var(--line);
    font-size: 11px; color: var(--ink-soft);
}
.fwt-dot { width: 8px; height: 8px; display: inline-block; margin-right: 5px; border-radius: 1px; }
.fwt-dot--hyd { background: #0f4c81; }
.fwt-dot--spr { background: #38bdf8; }
.fwt-dot--refill { background: #86efac; }

/* 结果区 */
.fwt-big {
    border: 1px solid var(--ink); padding: 12px 14px; margin-bottom: 12px;
    display: grid; grid-template-columns: 1fr auto; align-items: end; gap: 2px 6px;
    background: #fff;
}
.fwt-big span { grid-column: 1 / -1; font-size: 11px; color: var(--ink-soft); letter-spacing: .08em; }
.fwt-big strong {
    font-size: 34px; line-height: 1; color: var(--blue);
    font-family: ui-monospace, SFMono-Regular, Consolas, monospace; font-weight: 700;
    font-variant-numeric: tabular-nums;
}
.fwt-big em { font-style: normal; font-size: 12px; color: var(--ink-soft); padding-bottom: 3px; }

.fwt-table { width: 100%; border-collapse: collapse; font-size: 12px; margin-bottom: 12px; }
.fwt-table th, .fwt-table td { padding: 6px 6px; border-bottom: 1px dashed #dbe3ea; text-align: left; }
.fwt-table th { font-weight: 400; color: var(--ink-soft); }
.fwt-table td { text-align: right; color: var(--ink); font-variant-numeric: tabular-nums; font-family: ui-monospace, monospace; }
.fwt-table tr.is-key th { color: var(--blue); font-weight: 700; }
.fwt-table tr.is-key td { color: var(--blue); font-weight: 700; border-bottom: 1px solid var(--blue); }

.fwt-judge {
    border-left: 4px solid #94a3b8; background: #f1f5f9; padding: 9px 12px;
    display: flex; flex-direction: column; gap: 2px; margin-bottom: 12px;
}
.fwt-judge b { font-size: 13px; color: #334155; }
.fwt-judge span { font-size: 11px; color: #64748b; line-height: 1.5; }
.fwt-judge.is-ok { border-color: #15803d; background: #f0fdf4; }
.fwt-judge.is-ok b { color: #14532d; }
.fwt-judge.is-warn { border-color: #b45309; background: #fffbeb; }
.fwt-judge.is-warn b { color: #92400e; }
.fwt-judge.is-bad { border-color: #b91c1c; background: #fef2f2; }
.fwt-judge.is-bad b { color: #991b1b; }

.fwt-actions { display: flex; gap: 6px; margin-bottom: 12px; }
.fwt-btn {
    flex: 1; font: inherit; font-size: 12px; padding: 8px 10px; cursor: pointer;
    background: var(--blue); color: #fff; border: 1px solid var(--blue); border-radius: 2px;
}
.fwt-btn:hover { background: #0b3a63; }
.fwt-btn--ghost { background: #fff; color: var(--ink-soft); border-color: var(--line); }
.fwt-btn--ghost:hover { background: #f1f5f9; color: var(--ink); }
.fwt-btn:focus-visible { outline: 2px solid #b45309; outline-offset: 2px; }

.fwt-process { border-top: 1px solid var(--line); padding-top: 8px; }
.fwt-process summary { font-size: 11px; color: var(--ink-soft); cursor: pointer; letter-spacing: .05em; }
.fwt-process pre {
    margin: 8px 0 0; padding: 10px; background: #0f2233; color: #d7e6f2;
    font-size: 11.5px; line-height: 1.65; border-radius: 2px; overflow-x: auto;
    font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
}

.fwt-basis { border-top: 2px solid var(--ink); margin-top: 20px; padding: 14px 0 8px; }
.fwt-basis h2 { font-size: 13px; color: var(--ink); margin: 0 0 8px; letter-spacing: .05em; }
.fwt-basis ul { margin: 0; padding-left: 18px; }
.fwt-basis li { font-size: 12px; color: var(--ink-soft); line-height: 1.75; margin-bottom: 3px; }
.fwt-basis code { background: rgba(15, 76, 129, .07); padding: 1px 4px; color: var(--blue); font-size: 11.5px; }
.fwt-basis sub { font-size: 9px; }

.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;
}

@media (max-width: 1080px) {
    .fwt-work { grid-template-columns: 210px minmax(0, 1fr); }
    .fwt-calc { grid-column: 1 / -1; display: grid; grid-template-columns: 1fr 1fr; gap: 0 20px; align-items: start; }
    .fwt-big { grid-column: 1 / -1; }
    .fwt-actions { grid-column: 1 / -1; }
    .fwt-process { grid-column: 1 / -1; }
}
@media (max-width: 760px) {
    .fwt-frame { padding: 16px 14px 4px; }
    .fwt-work { grid-template-columns: 1fr; gap: 16px; }
    .fwt-calc { display: block; }
    .fwt-row input, .fwt-row select { width: 46%; }
    .fwt-titleblock h1 { font-size: 20px; }
    .fwt-tb-meta { width: 100%; }
    .fwt-tb-meta > div { flex: 1; padding: 6px 8px; }
    .fwt-big strong { font-size: 30px; }
}

/* 深色模式 */
[data-theme="dark"] .fwt-sheet {
    --ink: #dbeafe;
    --ink-soft: #94a3b8;
    --paper: #0b1220;
    --line: #2b3b4d;
    background:
        linear-gradient(0deg, rgba(148, 197, 255, .045) 1px, transparent 1px) 0 0 / 20px 20px,
        linear-gradient(90deg, rgba(148, 197, 255, .045) 1px, transparent 1px) 0 0 / 20px 20px,
        var(--paper);
    border-color: #26364a;
    box-shadow: none;
}
[data-theme="dark"] .fwt-tb-kicker { background: rgba(96, 165, 250, .15); color: #93c5fd; }
[data-theme="dark"] .fwt-tb-meta { border-color: #3b4d63; }
[data-theme="dark"] .fwt-preset { background: #101a29; border-color: #2b3b4d; color: #94a3b8; }
[data-theme="dark"] .fwt-preset.is-on { background: #1d4ed8; border-color: #1d4ed8; color: #fff; }
[data-theme="dark"] .fwt-row input, [data-theme="dark"] .fwt-row select {
    background: #0f1a2a; color: #e2e8f0; border-color: #2b3b4d;
}
[data-theme="dark"] .fwt-row input.is-bad { background: #3b1219; border-color: #ef4444; }
[data-theme="dark"] .fwt-canvas { background: #0d1624; border-color: #2b3b4d; }
[data-theme="dark"] .fwt-canvas-head, [data-theme="dark"] .fwt-canvas-foot { border-color: #2b3b4d; }
[data-theme="dark"] .fwt-svg rect[fill="#e8eef4"] { fill: #16243a; }
[data-theme="dark"] .fwt-svg text[fill="#334155"] { fill: #cbd5e1; }
[data-theme="dark"] .fwt-svg text[fill="#64748b"] { fill: #94a3b8; }
[data-theme="dark"] .fwt-big { background: #0f1a2a; border-color: #3b4d63; }
[data-theme="dark"] .fwt-big strong { color: #7dd3fc; }
[data-theme="dark"] .fwt-table th, [data-theme="dark"] .fwt-table td { border-bottom-color: #22303f; }
[data-theme="dark"] .fwt-table td { color: #e2e8f0; }
[data-theme="dark"] .fwt-table tr.is-key th, [data-theme="dark"] .fwt-table tr.is-key td { color: #7dd3fc; border-bottom-color: #38bdf8; }
[data-theme="dark"] .fwt-judge { background: rgba(148, 163, 184, .08); }
[data-theme="dark"] .fwt-judge b { color: #cbd5e1; }
[data-theme="dark"] .fwt-judge.is-ok { background: rgba(21, 128, 61, .16); }
[data-theme="dark"] .fwt-judge.is-ok b { color: #86efac; }
[data-theme="dark"] .fwt-judge.is-warn { background: rgba(180, 83, 9, .18); }
[data-theme="dark"] .fwt-judge.is-warn b { color: #fcd34d; }
[data-theme="dark"] .fwt-judge.is-bad { background: rgba(185, 28, 28, .18); }
[data-theme="dark"] .fwt-judge.is-bad b { color: #fca5a5; }
[data-theme="dark"] .fwt-btn--ghost { background: transparent; color: #94a3b8; border-color: #2b3b4d; }
[data-theme="dark"] .fwt-btn--ghost:hover { background: rgba(255,255,255,.06); color: #e2e8f0; }
[data-theme="dark"] .fwt-process pre { background: #060d17; }
[data-theme="dark"] .fwt-basis code { background: rgba(96, 165, 250, .12); color: #93c5fd; }