/* 宽高比计算器 · 画幅比例尺（arc-）· 纸白 / 朱红 / 墨黑 */
.arc-page, .arc-modal, .arc-toast {
    --arc-bg: #fbf8f1; --arc-panel: #fffdf8; --arc-panel2: #f4efe4;
    --arc-ink: #26221d; --arc-sub: #756c60; --arc-line: #e7dfd1; --arc-line2: #d2c6b1;
    --arc-red: #b23a2e; --arc-red-soft: #f9e8e4; --arc-ink-soft: #34404c;
    --arc-ok: #2c6b4a; --arc-shadow: 0 12px 32px rgba(80, 60, 35, .12); --arc-shadow-sm: 0 3px 10px rgba(80, 60, 35, .08);
    --arc-radius: 4px;
    --arc-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
    --arc-font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}
.arc-page { background: var(--arc-bg); color: var(--arc-ink); padding: 0 0 60px; min-height: 60vh; font-family: var(--arc-font); font-size: 14px; line-height: 1.78; }
.arc-wrap { max-width: 1180px; margin: 0 auto; padding: 18px 18px 0; }
.arc-page .detail-breadcrumb { font-size: 12.5px; color: var(--arc-sub); margin: 8px 0 20px; }
.arc-page .detail-breadcrumb a { color: var(--arc-sub); text-decoration: none; }
.arc-page .detail-breadcrumb a:hover { color: var(--arc-red); }
.arc-page .detail-breadcrumb .current { color: var(--arc-red); font-weight: 700; }

.arc-hero { display: grid; grid-template-columns: 1.15fr .85fr; gap: 26px; align-items: stretch; margin-bottom: 22px; }
.arc-kicker { font: 700 11px var(--arc-mono); letter-spacing: 2px; color: var(--arc-red); margin-bottom: 14px; }
.arc-kicker i { display: inline-block; width: 42px; height: 1px; background: var(--arc-ink); vertical-align: middle; margin: 0 10px; }
.arc-page h1 { font-size: 39px; line-height: 1.18; font-weight: 800; margin: 0 0 14px; letter-spacing: -.4px; }
.arc-sub { font-size: 15.5px; line-height: 1.9; color: var(--arc-sub); margin: 0 0 20px; max-width: 620px; }
.arc-sub b { color: var(--arc-ink); font-weight: 700; border-bottom: 2px solid var(--arc-red); }
.arc-facts { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 18px; }
.arc-fact { background: var(--arc-panel); border: 1px solid var(--arc-line2); border-bottom: 3px solid var(--arc-ink-soft); border-radius: var(--arc-radius); padding: 9px 16px; min-width: 118px; box-shadow: var(--arc-shadow-sm); }
.arc-fact b { display: block; font: 800 20px/1.2 var(--arc-mono); }
.arc-fact span { font-size: 11.5px; color: var(--arc-sub); }
.arc-fact.hot { border-bottom-color: var(--arc-red); }
.arc-fact.hot b { color: var(--arc-red); }
.arc-film { display: flex; flex-wrap: wrap; gap: 7px; }
.arc-film-item { position: relative; border: 1px solid var(--arc-line2); background: var(--arc-panel); color: var(--arc-ink); border-radius: 3px; padding: 7px 12px 7px 30px; font: 700 12px var(--arc-mono); cursor: pointer; }
.arc-film-item::before { content: ""; position: absolute; left: 10px; top: 50%; transform: translateY(-50%); width: 12px; height: 9px; border: 1.5px solid currentColor; }
.arc-film-item.is-on { background: var(--arc-red); border-color: var(--arc-red); color: #fff; }
.arc-hero-stamp { background: var(--arc-panel); border: 1px solid var(--arc-line2); border-radius: var(--arc-radius); padding: 14px; box-shadow: var(--arc-shadow); display: flex; flex-direction: column; }
.arc-stamp-top { font: 700 10.5px var(--arc-mono); letter-spacing: 1.6px; color: var(--arc-sub); border-bottom: 1px dashed var(--arc-line2); padding-bottom: 8px; }
.arc-stamp-frame { flex: 1; min-height: 170px; display: flex; align-items: center; justify-content: center; padding: 14px; }
.arc-stamp-box { display: flex; align-items: center; justify-content: center; gap: 12px; background: repeating-linear-gradient(-45deg, #f3ece0, #f3ece0 9px, #ece2d1 9px, #ece2d1 18px); border: 2px solid var(--arc-red); color: var(--arc-red); font: 800 28px var(--arc-mono); aspect-ratio: 16 / 9; width: min(100%, 250px); }
.arc-stamp-box i { font-style: normal; font-size: 18px; opacity: .6; }
.arc-stamp-foot { font: 11px var(--arc-mono); color: var(--arc-sub); border-top: 1px dashed var(--arc-line2); padding-top: 8px; }

.arc-panel { background: var(--arc-panel); border: 1px solid var(--arc-line2); border-radius: var(--arc-radius); padding: 18px; box-shadow: var(--arc-shadow-sm); }
.arc-panel-head { display: flex; align-items: center; gap: 10px; margin-bottom: 16px; flex-wrap: wrap; }
.arc-panel-head h2 { font-size: 17px; font-weight: 800; margin: 0; }
.arc-step { font: 800 11px var(--arc-mono); color: #fff; background: var(--arc-red); padding: 5px 7px; border-radius: 2px; }
.arc-hint { font-size: 12px; color: var(--arc-sub); margin-left: auto; }
.arc-btn { border: 1px solid var(--arc-line2); background: var(--arc-panel2); color: var(--arc-ink); border-radius: 3px; padding: 8px 13px; font-size: 12.5px; cursor: pointer; font-family: inherit; }
.arc-btn:hover { border-color: var(--arc-red); color: var(--arc-red); }
.arc-btn-main { background: var(--arc-red); border-color: var(--arc-red); color: #fff; font-weight: 700; }
.arc-btn-main:hover { color: #fff; }
.arc-code-btns { margin-left: auto; display: flex; gap: 6px; flex-wrap: wrap; }

.arc-work { display: grid; grid-template-columns: 1.2fr .8fr; gap: 18px; margin-bottom: 18px; }
.arc-visual, .arc-controls { min-width: 0; }
.arc-visual-stage { min-height: 300px; background: var(--arc-panel2); border: 1px dashed var(--arc-line2); border-radius: var(--arc-radius); display: flex; align-items: center; justify-content: center; padding: 34px; }
.arc-frame { position: relative; aspect-ratio: 16 / 9; width: min(100%, 420px); background: linear-gradient(135deg, #f0e7d8, #e2d4bc); border: 2px solid var(--arc-ink-soft); display: flex; align-items: center; justify-content: center; transition: aspect-ratio .2s; }
.arc-frame-inner { text-align: center; }
.arc-frame-inner b { display: block; font: 800 26px var(--arc-mono); color: var(--arc-ink-soft); }
.arc-frame-inner small { font: 11px var(--arc-mono); color: var(--arc-sub); }
.arc-dim { position: absolute; font: 700 10.5px var(--arc-mono); color: var(--arc-red); white-space: nowrap; }
.arc-dim-w { left: 0; right: 0; bottom: -22px; text-align: center; }
.arc-dim-h { top: 0; bottom: 0; right: -26px; writing-mode: vertical-rl; display: flex; align-items: center; }
.arc-visual-note { margin-top: 30px; font-size: 12px; color: var(--arc-sub); }

.arc-mode { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 14px; }
.arc-chip { border: 1px solid var(--arc-line2); background: var(--arc-panel); color: var(--arc-sub); border-radius: 3px; padding: 6px 11px; font-size: 12px; cursor: pointer; font-family: inherit; }
.arc-chip.is-on { background: var(--arc-ink-soft); border-color: var(--arc-ink-soft); color: #fff; font-weight: 700; }
.arc-grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-bottom: 10px; }
.arc-field { display: flex; flex-direction: column; gap: 4px; min-width: 0; }
.arc-field > span { font-size: 12px; color: var(--arc-sub); }
.arc-field input, .arc-field select { width: 100%; box-sizing: border-box; border: 1px solid var(--arc-line2); background: var(--arc-panel2); color: var(--arc-ink); border-radius: 3px; padding: 8px 9px; font: 13px var(--arc-mono); }
.arc-err { margin: 10px 0 0; background: var(--arc-red-soft); color: var(--arc-red); border-radius: 3px; padding: 8px 10px; font-size: 12.5px; }
.arc-err[hidden] { display: none; }
.arc-kpis { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-top: 12px; }
.arc-kpi { background: var(--arc-panel2); border-left: 3px solid var(--arc-red); padding: 8px 10px; border-radius: 2px; }
.arc-kpi b { display: block; font: 800 15px var(--arc-mono); }
.arc-kpi span { font-size: 11px; color: var(--arc-sub); }

.arc-derive { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-bottom: 18px; }
.arc-derive-out { margin-top: 12px; font-size: 12.5px; line-height: 1.9; background: var(--arc-panel2); border-radius: 3px; padding: 12px; }
.arc-derive-out b { color: var(--arc-red); font-family: var(--arc-mono); }
.arc-table-scroll { overflow-x: auto; }
.arc-table { width: 100%; border-collapse: collapse; font-size: 12.5px; min-width: 480px; }
.arc-table th, .arc-table td { border-bottom: 1px solid var(--arc-line); padding: 8px 9px; text-align: left; }
.arc-table th { background: var(--arc-panel2); color: var(--arc-sub); font-weight: 700; }
.arc-table td input { width: 100%; min-width: 66px; box-sizing: border-box; border: 1px solid var(--arc-line2); background: var(--arc-panel2); color: var(--arc-ink); border-radius: 3px; padding: 4px 6px; font: 12px var(--arc-mono); }
.arc-table .arc-del { border: 0; background: none; color: var(--arc-red); cursor: pointer; font-size: 16px; }
.arc-empty { color: var(--arc-sub); text-align: center; padding: 16px !important; }
.arc-preset-btn { border: 0; background: none; color: var(--arc-red); cursor: pointer; font: 700 12px var(--arc-mono); padding: 0; }

.arc-modal[hidden] { display: none !important; }
.arc-modal { position: fixed; inset: 0; z-index: 9999; background: rgba(38,32,24,.6); display: flex; align-items: center; justify-content: center; padding: 20px; }
.arc-modal-card { position: relative; background: var(--arc-panel); color: var(--arc-ink); border-radius: var(--arc-radius); padding: 26px; width: min(520px, 100%); box-shadow: var(--arc-shadow); }
.arc-modal-card h2 { font-size: 19px; margin: 0 0 8px; }
.arc-modal-card p { font-size: 13px; color: var(--arc-sub); margin: 0 0 14px; }
.arc-modal-card input { width: 100%; box-sizing: border-box; border: 1px solid var(--arc-line2); border-radius: 3px; padding: 9px 10px; font: 12px var(--arc-mono); background: var(--arc-panel2); color: var(--arc-ink); margin-bottom: 12px; }
.arc-modal-x { position: absolute; right: 12px; top: 8px; border: 0; background: none; font-size: 24px; color: var(--arc-sub); cursor: pointer; line-height: 1; }
.arc-toast { position: fixed; left: 50%; bottom: 34px; transform: translateX(-50%) translateY(20px); background: var(--arc-ink-soft); color: #fff; padding: 10px 20px; border-radius: 3px; font-size: 13px; opacity: 0; pointer-events: none; transition: .22s; z-index: 10000; }
.arc-toast.is-on { opacity: 1; transform: translateX(-50%) translateY(0); }

:root[data-theme="dark"] .arc-page, :root[data-theme="dark"] .arc-modal, :root[data-theme="dark"] .arc-toast {
    --arc-bg: #171512; --arc-panel: #211d19; --arc-panel2: #2a251f;
    --arc-ink: #f0e9dc; --arc-sub: #b3a795; --arc-line: #3a332b; --arc-line2: #4e453a;
    --arc-red: #f08a7a; --arc-red-soft: #3c231f; --arc-ink-soft: #c3bdd0;
    --arc-ok: #7fd0a2; --arc-shadow: 0 12px 32px rgba(0,0,0,.5); --arc-shadow-sm: 0 3px 10px rgba(0,0,0,.4);
}
:root[data-theme="dark"] .arc-step, :root[data-theme="dark"] .arc-btn-main, :root[data-theme="dark"] .arc-chip.is-on { color: #171512; }
:root[data-theme="dark"] .arc-frame { background: linear-gradient(135deg, #3a332b, #2c261f); border-color: var(--arc-ink-soft); }
:root[data-theme="dark"] .arc-frame-inner b { color: var(--arc-ink); }
:root[data-theme="dark"] .arc-stamp-box { background: repeating-linear-gradient(-45deg, #2c261f, #2c261f 9px, #3a332b 9px, #3a332b 18px); }
:root[data-theme="dark"] .arc-toast { background: var(--arc-red); color: #171512; }

@media (max-width: 920px) { .arc-hero, .arc-work, .arc-derive { grid-template-columns: 1fr; } .arc-page h1 { font-size: 30px; } }
@media (max-width: 560px) {
    .arc-wrap { padding: 12px 12px 0; } .arc-page h1 { font-size: 26px; }
    .arc-sub { font-size: 14px; line-height: 1.8; } .arc-panel { padding: 14px; }
    .arc-grid2, .arc-kpis { grid-template-columns: 1fr; } .arc-code-btns { margin-left: 0; }
    .arc-visual-stage { padding: 22px; } .arc-dim-h { right: -18px; }
    /* grid item 默认 min-width:auto，会被内部 min-width 表格撑宽导致整页横向溢出 */
    .arc-work > *, .arc-derive > * { min-width: 0; }
    .arc-table { min-width: 0; }
}