/* ==========================================================================
   几何最大面积训练器 /tool/geo-max-area-drill
   视觉主题：工程图纸 —— 石墨黑 + 荧光青 + 银白
   ========================================================================== */

.gma-page {
    --gma-silver: #f2f4f5;
    --gma-silver-2: #ffffff;
    --gma-silver-3: #e7ebed;
    --gma-ink: #1f2429;
    --gma-ink-2: #4b555d;
    --gma-ink-3: #7e8992;
    --gma-line: #d2dade;
    --gma-line-2: #e4e8ea;
    --gma-cyan: #0e9c96;
    --gma-cyan-2: #0a7d78;
    --gma-cyan-soft: #d8f0ee;
    --gma-graphite: #1f2429;
    --gma-graphite-2: #2f363d;
    --gma-graphite-soft: #e3e7e9;
    --gma-orange: #dd7736;
    --gma-orange-soft: #fbe9db;
    --gma-ok: #0e9c96;
    --gma-warn: #b8791b;
    --gma-err: #c2413a;
    --gma-shadow: 0 12px 30px rgba(31, 36, 41, .14);
    --gma-shadow-sm: 0 4px 14px rgba(31, 36, 41, .1);
    --gma-radius: 4px;
}

:root[data-theme="dark"] .gma-page {
    --gma-silver: #1b1f23;
    --gma-silver-2: #22272c;
    --gma-silver-3: #2b3137;
    --gma-ink: #e8edf0;
    --gma-ink-2: #aab4bb;
    --gma-ink-3: #7c868d;
    --gma-line: #333b42;
    --gma-line-2: #2c3339;
    --gma-cyan: #35d6cd;
    --gma-cyan-2: #5ee2da;
    --gma-cyan-soft: #12312f;
    --gma-graphite: #d7dde1;
    --gma-graphite-2: #eaf0f3;
    --gma-graphite-soft: #2a3137;
    --gma-orange: #f0995c;
    --gma-orange-soft: #3a2a1d;
    --gma-ok: #35d6cd;
    --gma-warn: #d9a44f;
    --gma-err: #e07a72;
    --gma-shadow: 0 12px 30px rgba(0, 0, 0, .4);
    --gma-shadow-sm: 0 4px 14px rgba(0, 0, 0, .34);
}

.gma-page {
    color: var(--gma-ink);
    font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    line-height: 1.7;
    font-variant-numeric: tabular-nums;
    padding-bottom: 40px;
}

.gma-page * { box-sizing: border-box; }

.gma-page h1,
.gma-page h2,
.gma-page h3 {
    font-family: "DIN Alternate", "Bahnschrift", "PingFang SC", Arial, sans-serif;
    margin: 0;
    letter-spacing: .5px;
}

/* ===================== 首屏 ===================== */
.gma-hero {
    background:
        linear-gradient(rgba(14, 156, 150, .07) 1px, transparent 1px) 0 0 / 100% 24px,
        linear-gradient(90deg, rgba(14, 156, 150, .07) 1px, transparent 1px) 0 0 / 24px 100%,
        linear-gradient(180deg, var(--gma-silver-2), var(--gma-silver));
    border: 1px solid var(--gma-line);
    border-radius: var(--gma-radius);
    box-shadow: var(--gma-shadow);
    padding: 28px 28px 22px;
    margin-bottom: 20px;
    position: relative;
}

.gma-hero::before {
    content: "";
    position: absolute;
    inset: 0 0 auto 0;
    height: 4px;
    background: repeating-linear-gradient(90deg, var(--gma-cyan) 0 18px, var(--gma-graphite) 18px 36px);
}

.gma-hero-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 320px;
    gap: 24px;
    align-items: start;
}

.gma-kicker {
    display: inline-block;
    font-size: 11.5px;
    letter-spacing: 3px;
    color: var(--gma-cyan-2);
    border: 1px solid var(--gma-cyan);
    border-radius: 2px;
    padding: 2px 12px;
    background: var(--gma-cyan-soft);
    margin-bottom: 10px;
}

.gma-hero-copy h1 { font-size: 30px; color: var(--gma-graphite); margin-bottom: 8px; }
.gma-lead { margin: 0 0 12px; color: var(--gma-ink-2); font-size: 14.5px; max-width: 62ch; }
.gma-lead b { color: var(--gma-cyan-2); }

.gma-tags { list-style: none; margin: 0 0 16px; padding: 0; display: flex; flex-wrap: wrap; gap: 6px; }

.gma-tags li {
    font-size: 12px;
    color: var(--gma-ink-2);
    background: var(--gma-silver-3);
    border: 1px solid var(--gma-line-2);
    border-radius: 2px;
    padding: 2px 10px;
}

/* ===================== 操作入口 ===================== */
.gma-entry {
    background: var(--gma-silver-2);
    border: 1px solid var(--gma-line);
    border-left: 4px solid var(--gma-cyan);
    border-radius: var(--gma-radius);
    padding: 18px 18px 16px;
    box-shadow: var(--gma-shadow-sm);
}

.gma-entry-head {
    display: flex;
    align-items: baseline;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 13px;
    padding-bottom: 9px;
    border-bottom: 1px dashed var(--gma-line);
}

.gma-entry-head b { font-size: 15px; color: var(--gma-cyan-2); }
.gma-entry-head span { font-size: 12.5px; color: var(--gma-ink-3); }

.gma-chip-row { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 12px; }
.gma-chip { position: relative; cursor: pointer; }
.gma-chip input { position: absolute; opacity: 0; width: 0; height: 0; }

.gma-chip-box {
    display: block;
    padding: 7px 14px;
    border: 1px solid var(--gma-line);
    border-radius: 2px;
    background: var(--gma-silver);
    font-size: 13.5px;
    color: var(--gma-ink-2);
    transition: all .16s ease;
}

.gma-chip input:checked + .gma-chip-box {
    background: var(--gma-graphite);
    border-color: var(--gma-graphite);
    color: #fff;
}

:root[data-theme="dark"] .gma-page .gma-chip input:checked + .gma-chip-box { color: var(--gma-graphite); }
.gma-chip input:focus-visible + .gma-chip-box { outline: 2px solid var(--gma-cyan); outline-offset: 2px; }

.gma-mode-hint { font-size: 12px; color: var(--gma-ink-3); margin: 0 0 12px; }

.gma-field { display: flex; flex-direction: column; gap: 3px; }
.gma-label { font-size: 12.5px; color: var(--gma-ink-2); display: flex; align-items: baseline; gap: 4px; }
.gma-label .gma-unit { font-size: 11px; color: var(--gma-ink-3); }

.gma-input {
    width: 100%;
    padding: 8px 11px;
    border: 1px solid var(--gma-line);
    border-radius: 2px;
    background: var(--gma-silver);
    color: var(--gma-ink);
    font-size: 15px;
    font-family: "DIN Alternate", Consolas, monospace;
    font-variant-numeric: tabular-nums;
    transition: border-color .16s ease, box-shadow .16s ease;
}

.gma-input:focus {
    outline: none;
    border-color: var(--gma-cyan);
    box-shadow: 0 0 0 3px rgba(14, 156, 150, .16);
}

.gma-input.is-bad { border-color: var(--gma-err); background: rgba(194, 65, 58, .06); }

.gma-input-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 12px;
    margin-bottom: 12px;
}

.gma-err-tip { font-size: 11.5px; color: var(--gma-err); min-height: 15px; line-height: 1.35; }
.gma-err-tip.is-warn { color: var(--gma-warn); }

.gma-formula {
    background: var(--gma-graphite);
    color: #d8f0ee;
    border-radius: 2px;
    padding: 10px 14px;
    font-size: 12.5px;
    line-height: 1.7;
    margin-top: 12px;
    font-family: Consolas, "Courier New", monospace;
}

:root[data-theme="dark"] .gma-page .gma-formula { color: var(--gma-graphite); }

.gma-why {
    margin-top: 12px;
    background: var(--gma-silver-3);
    border: 1px solid var(--gma-line-2);
    border-radius: 2px;
    padding: 12px 14px;
}

.gma-why h3 { font-size: 13.5px; color: var(--gma-graphite); margin-bottom: 6px; }
.gma-why ul { margin: 0; padding-left: 18px; font-size: 12.5px; color: var(--gma-ink-2); }
.gma-why li { margin-bottom: 2px; }

/* ===================== 右侧仪表 ===================== */
.gma-side { display: flex; flex-direction: column; gap: 12px; }

.gma-gauge {
    background: var(--gma-graphite);
    border: 1px solid var(--gma-graphite);
    border-radius: var(--gma-radius);
    overflow: hidden;
    box-shadow: var(--gma-shadow-sm);
}

.gma-gauge-head {
    background: var(--gma-cyan);
    color: #04211f;
    font-size: 12.5px;
    letter-spacing: 3px;
    text-align: center;
    padding: 7px;
    font-weight: 700;
}

.gma-gauge-body { padding: 14px 16px 16px; }

.gma-gauge-main {
    text-align: center;
    padding-bottom: 12px;
    margin-bottom: 10px;
    border-bottom: 1px dashed rgba(255, 255, 255, .22);
}

.gma-gauge-label { font-size: 12px; color: rgba(255, 255, 255, .62); display: block; }

.gma-gauge-value {
    font-size: 30px;
    color: #45e0d6;
    font-family: "DIN Alternate", "Arial Narrow", Arial, sans-serif;
    letter-spacing: .5px;
    line-height: 1.25;
}

.gma-gauge-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 7px 10px; }

.gma-gauge-item {
    background: rgba(255, 255, 255, .07);
    border: 1px solid rgba(255, 255, 255, .12);
    border-radius: 2px;
    padding: 6px 9px;
}

.gma-gauge-item span { display: block; font-size: 11px; color: rgba(255, 255, 255, .6); }
.gma-gauge-item b { display: block; font-size: 14.5px; color: #fff; word-break: break-all; }

:root[data-theme="dark"] .gma-page .gma-gauge { background: var(--gma-graphite-soft); border-color: var(--gma-line); }
:root[data-theme="dark"] .gma-page .gma-gauge-value { color: var(--gma-cyan-2); }
:root[data-theme="dark"] .gma-page .gma-gauge-label { color: var(--gma-ink-3); }
:root[data-theme="dark"] .gma-page .gma-gauge-main { border-bottom-color: var(--gma-line); }
:root[data-theme="dark"] .gma-page .gma-gauge-item { background: var(--gma-silver-3); border-color: var(--gma-line); }
:root[data-theme="dark"] .gma-page .gma-gauge-item span { color: var(--gma-ink-3); }
:root[data-theme="dark"] .gma-page .gma-gauge-item b { color: var(--gma-ink); }

/* ===================== 预置 ===================== */
.gma-presets {
    margin-top: 16px;
    padding-top: 12px;
    border-top: 1px dashed var(--gma-line);
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.gma-presets-label { font-size: 12.5px; color: var(--gma-ink-3); margin-right: 2px; }

.gma-presets button {
    font-family: inherit;
    font-size: 12.5px;
    color: var(--gma-ink-2);
    background: var(--gma-silver);
    border: 1px solid var(--gma-line);
    border-radius: 2px;
    padding: 4px 13px;
    cursor: pointer;
    transition: all .16s ease;
}

.gma-presets button:hover { border-color: var(--gma-cyan); color: var(--gma-cyan-2); background: var(--gma-cyan-soft); }

/* ===================== 错误条 ===================== */
.gma-errbar {
    background: rgba(194, 65, 58, .08);
    border: 1px solid var(--gma-err);
    border-left-width: 4px;
    border-radius: var(--gma-radius);
    padding: 12px 16px;
    margin-bottom: 18px;
    font-size: 13px;
    color: var(--gma-err);
}

.gma-errbar b { display: block; margin-bottom: 4px; }
.gma-errbar ul { margin: 0; padding-left: 18px; }
.gma-errbar li { margin-bottom: 2px; }
.gma-errbar .gma-warn-title { color: var(--gma-warn); margin-top: 6px; }

.gma-errbar.is-warn {
    background: rgba(184, 121, 27, .07);
    border-color: var(--gma-warn);
    color: var(--gma-warn);
}

.gma-errbar.is-warn .gma-warn-title { color: var(--gma-warn); margin-top: 0; }

/* ===================== 结果面板 ===================== */
.gma-result { display: flex; flex-direction: column; gap: 18px; }

.gma-panel {
    background: var(--gma-silver-2);
    border: 1px solid var(--gma-line);
    border-radius: var(--gma-radius);
    padding: 20px 22px;
    box-shadow: var(--gma-shadow-sm);
    position: relative;
}

.gma-panel::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--gma-cyan), var(--gma-orange));
}

.gma-panel-head { margin-bottom: 14px; }

.gma-panel-kicker {
    display: inline-block;
    font-size: 11.5px;
    letter-spacing: 2px;
    color: var(--gma-cyan-2);
    border: 1px solid var(--gma-cyan);
    border-radius: 2px;
    padding: 1px 9px;
    margin-bottom: 6px;
}

.gma-panel-head h2 { font-size: 19px; color: var(--gma-graphite); }
.gma-panel-head p { margin: 4px 0 0; font-size: 13px; color: var(--gma-ink-2); }

.gma-table-wrap { overflow-x: auto; }

.gma-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13.5px;
    min-width: 520px;
}

.gma-table th,
.gma-table td { border: 1px solid var(--gma-line-2); padding: 9px 11px; text-align: left; }

.gma-table th { background: var(--gma-graphite-soft); color: var(--gma-ink); font-size: 12.5px; font-weight: 600; }

.gma-num { text-align: right !important; color: var(--gma-cyan-2); font-weight: 600; }

.gma-empty { text-align: center !important; color: var(--gma-ink-3); padding: 18px 8px !important; }

.gma-ops button {
    font-family: inherit;
    font-size: 12px;
    color: var(--gma-ink-2);
    background: var(--gma-silver);
    border: 1px solid var(--gma-line);
    border-radius: 2px;
    padding: 2px 9px;
    margin-right: 5px;
    cursor: pointer;
}

.gma-ops button:hover { border-color: var(--gma-cyan); color: var(--gma-cyan-2); }

/* ===================== 训练器 ===================== */
.gma-quiz-card {
    background: var(--gma-graphite-soft);
    border: 1px solid var(--gma-line);
    border-left: 4px solid var(--gma-orange);
    border-radius: var(--gma-radius);
    padding: 16px 18px;
}

.gma-quiz-bar { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 12px; }
.gma-quiz-bar .gma-input { width: auto; min-width: 120px; }

.gma-quiz-text {
    font-size: 16px;
    color: var(--gma-ink);
    background: var(--gma-silver-2);
    border: 1px solid var(--gma-line);
    border-radius: 2px;
    padding: 13px 16px;
    white-space: pre-line;
    margin-bottom: 12px;
}

.gma-quiz-answer-row { display: flex; align-items: flex-end; gap: 10px; flex-wrap: wrap; }
.gma-quiz-answer-row .gma-input { max-width: 220px; }

.gma-quiz-feedback {
    margin-top: 12px;
    border: 1px solid var(--gma-line);
    border-left: 3px solid var(--gma-line);
    border-radius: 2px;
    padding: 10px 14px;
    font-size: 13.5px;
    background: var(--gma-silver-2);
    color: var(--gma-ink-2);
}

.gma-quiz-feedback.is-ok { border-left-color: var(--gma-cyan); color: var(--gma-ok); }
.gma-quiz-feedback.is-bad { border-left-color: var(--gma-err); color: var(--gma-err); }

.gma-quiz-answer { margin-top: 12px; }
.gma-quiz-tip { font-size: 13px; color: var(--gma-ink-2); margin: 0; line-height: 1.8; }
.gma-quiz-tip b { color: var(--gma-cyan-2); font-size: 15px; }

/* ===================== 按钮 ===================== */
.gma-btn {
    font-family: inherit;
    font-size: 13.5px;
    padding: 8px 18px;
    border-radius: 2px;
    border: 1px solid var(--gma-graphite);
    background: var(--gma-graphite);
    color: #fff;
    cursor: pointer;
    transition: all .16s ease;
}

.gma-btn:hover { background: var(--gma-cyan); border-color: var(--gma-cyan); color: #04211f; }

.gma-btn--cyan { background: var(--gma-cyan); border-color: var(--gma-cyan); color: #04211f; }
.gma-btn--cyan:hover { background: var(--gma-cyan-2); border-color: var(--gma-cyan-2); color: #04211f; }

.gma-btn--ghost { background: transparent; color: var(--gma-ink-2); border-color: var(--gma-line); }
.gma-btn--ghost:hover { background: var(--gma-cyan-soft); color: var(--gma-cyan-2); border-color: var(--gma-cyan); }

.gma-actions { display: flex; gap: 9px; flex-wrap: wrap; margin-top: 14px; }
.gma-batch-bar { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; margin-bottom: 12px; }
.gma-batch-best { margin: 0; font-size: 13px; color: var(--gma-ink-2); }
.gma-batch-best b { color: var(--gma-cyan-2); }

/* ===================== CSV / FAQ / 留言 ===================== */
.gma-pre {
    background: var(--gma-silver);
    border: 1px solid var(--gma-line);
    border-radius: 2px;
    padding: 14px 16px;
    font-size: 12px;
    line-height: 1.85;
    color: var(--gma-ink-2);
    overflow-x: auto;
    white-space: pre;
    margin: 0;
    font-family: Consolas, "Courier New", monospace;
}

.gma-faq-item {
    border: 1px solid var(--gma-line-2);
    border-radius: 2px;
    margin-bottom: 8px;
    background: var(--gma-silver);
    overflow: hidden;
}

.gma-faq-item summary {
    cursor: pointer;
    padding: 11px 16px;
    font-size: 14px;
    color: var(--gma-graphite);
    font-weight: 600;
    list-style: none;
}

.gma-faq-item summary::-webkit-details-marker { display: none; }
.gma-faq-item summary::before { content: "▸ "; color: var(--gma-cyan); }
.gma-faq-item[open] summary::before { content: "▾ "; }

.gma-faq-a {
    padding: 10px 16px 13px 34px;
    font-size: 13.5px;
    color: var(--gma-ink-2);
    border-top: 1px dashed var(--gma-line-2);
}

.gma-faq-a b { color: var(--gma-cyan-2); }

.gma-comments { margin-top: 4px; }

/* ===================== Toast ===================== */
.gma-toast {
    position: fixed;
    left: 50%;
    bottom: 28px;
    transform: translateY(8px);
    opacity: 0;
    pointer-events: none;
    z-index: 9999;
    background: var(--gma-graphite);
    color: #fff;
    font-size: 13.5px;
    padding: 9px 20px;
    border-radius: 2px;
    box-shadow: var(--gma-shadow);
    transition: opacity .22s ease, transform .22s ease;
}

.gma-toast.is-error { background: var(--gma-err); }

:root[data-theme="dark"] .gma-page .gma-toast { background: #3a4249; }

/* ===================== A4 几何单 ===================== */
.gma-sheet { display: none; }

@media print {
    body * { visibility: hidden !important; }
    .gma-sheet, .gma-sheet * { visibility: visible !important; }
    .gma-sheet {
        display: block !important;
        position: absolute;
        inset: 0;
        padding: 16mm 14mm;
        background: #fff;
        color: #111;
    }
}

.gma-sheet-title {
    font-size: 22px;
    text-align: center;
    letter-spacing: 4px;
    color: #111;
    padding-bottom: 8px;
    border-bottom: 2px solid #111;
}

.gma-sheet-sub { text-align: center; font-size: 12px; color: #555; padding: 6px 0 12px; }

.gma-sheet-table { width: 100%; border-collapse: collapse; font-size: 13px; }

.gma-sheet-table th,
.gma-sheet-table td { border: 1px solid #444; padding: 7px 9px; text-align: left; }

.gma-sheet-table th { background: #eee; }
.gma-sheet-num { text-align: right; }

.gma-sheet-note { font-size: 11.5px; color: #555; margin-top: 10px; line-height: 1.7; }

.gma-sheet-sign {
    display: flex;
    justify-content: space-between;
    gap: 20px;
    margin-top: 30px;
    font-size: 13px;
    color: #333;
}

/* ===================== 响应式 ===================== */
@media (max-width: 1000px) {
    .gma-hero-grid { grid-template-columns: 1fr; }
    .gma-side { flex-direction: row; flex-wrap: wrap; }
    .gma-gauge { flex: 1 1 300px; }
}

@media (max-width: 720px) {
    .gma-hero { padding: 20px 15px 16px; }
    .gma-hero-copy h1 { font-size: 24px; }
    .gma-panel { padding: 16px 14px; }
    .gma-side { flex-direction: column; }
    .gma-gauge-value { font-size: 26px; }
}