/* ==========================================================================
   简易方程与解方程练习 /tool/simple-equation-drill
   视觉主题：天平实验室 —— 深紫 #5b21b6 + 青柠 #65a30d
   （独立色系与独立骨架：单栏推导流水线 + 天平 SVG 舞台 + 实验记录式步骤流）
   ========================================================================== */

.sed-page {
    --sed-bg: #f5f3fb;
    --sed-panel: #ffffff;
    --sed-panel-2: #faf8ff;
    --sed-panel-3: #eee9f8;
    --sed-ink: #221a38;
    --sed-ink-2: #554c6e;
    --sed-ink-3: #8f88a6;
    --sed-line: #e4dff1;
    --sed-line-2: #cec6e2;
    --sed-purple: #5b21b6;
    --sed-purple-2: #45178f;
    --sed-purple-soft: #ede8fb;
    --sed-lime: #65a30d;
    --sed-lime-2: #4d7c0b;
    --sed-lime-soft: #ecf6dd;
    --sed-red: #b91c1c;
    --sed-red-soft: #fbeaea;
    --sed-shadow: 0 16px 38px rgba(46, 26, 86, .13);
    --sed-shadow-sm: 0 3px 12px rgba(46, 26, 86, .08);
    --sed-radius: 18px;
    color: var(--sed-ink);
    font-family: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    font-size: 15px;
    line-height: 1.78;
    font-variant-numeric: tabular-nums;
    padding-bottom: 56px;
}

:root[data-theme="dark"] .sed-page {
    --sed-bg: #0d0a18;
    --sed-panel: #171227;
    --sed-panel-2: #1d1730;
    --sed-panel-3: #261e3d;
    --sed-ink: #ece8f7;
    --sed-ink-2: #b3a9cf;
    --sed-ink-3: #7d739b;
    --sed-line: #2c2444;
    --sed-line-2: #3d3160;
    --sed-purple: #a78bfa;
    --sed-purple-2: #c4b0fd;
    --sed-purple-soft: #241a44;
    --sed-lime: #a3e635;
    --sed-lime-2: #bef264;
    --sed-lime-soft: #23310f;
    --sed-red: #f08b8b;
    --sed-red-soft: #37191b;
    --sed-shadow: 0 16px 38px rgba(0, 0, 0, .5);
    --sed-shadow-sm: 0 3px 12px rgba(0, 0, 0, .4);
}

.sed-page * { box-sizing: border-box; }
.sed-page h1, .sed-page h2, .sed-page h3 { font-family: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", sans-serif; margin: 0; }
.sed-alg { font-family: "SFMono-Regular", Consolas, Monaco, monospace; font-weight: 700; letter-spacing: -.2px; }

/* ===================== 首屏 ===================== */
.sed-hero {
    position: relative; overflow: hidden; border-radius: 24px; border: 1px solid var(--sed-line);
    background:
        radial-gradient(720px 300px at 6% -12%, color-mix(in srgb, var(--sed-purple) 14%, transparent), transparent 62%),
        radial-gradient(600px 280px at 96% 0%, color-mix(in srgb, var(--sed-lime) 15%, transparent), transparent 60%),
        linear-gradient(180deg, var(--sed-panel-2), var(--sed-panel));
    box-shadow: var(--sed-shadow); padding: 32px 34px 28px; margin-bottom: 20px;
}
.sed-hero-grid { display: grid; grid-template-columns: minmax(0, 1fr) 336px; gap: 28px; align-items: start; }
.sed-kicker {
    display: inline-flex; align-items: center; gap: 8px; font-size: 12px; font-weight: 800; letter-spacing: 2px;
    color: var(--sed-purple); background: var(--sed-purple-soft);
    border: 1px solid color-mix(in srgb, var(--sed-purple) 26%, transparent);
    border-radius: 999px; padding: 5px 14px; margin-bottom: 13px;
}
.sed-hero h1 { font-size: 33px; line-height: 1.25; letter-spacing: -.7px; margin-bottom: 11px; }
.sed-hero h1 em { font-style: normal; color: var(--sed-lime-2); }
.sed-lead { margin: 0 0 15px; font-size: 15.5px; line-height: 1.95; color: var(--sed-ink-2); max-width: 62ch; }
.sed-lead b { color: var(--sed-ink); }
.sed-points { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 9px; }
.sed-points li {
    display: flex; gap: 8px; align-items: flex-start; font-size: 13px; line-height: 1.7; color: var(--sed-ink-2);
    background: var(--sed-panel); border: 1px solid var(--sed-line); border-radius: 12px; padding: 10px 13px; font-weight: 600;
}
.sed-points li i { font-style: normal; color: var(--sed-lime-2); font-weight: 800; }

.sed-menu { background: var(--sed-panel); border: 1px solid var(--sed-line-2); border-radius: 16px; box-shadow: var(--sed-shadow-sm); overflow: hidden; }
.sed-menu-head { padding: 10px 16px; font-size: 12.5px; font-weight: 800; letter-spacing: 1.5px; color: #fff; background: linear-gradient(135deg, var(--sed-purple), var(--sed-purple-2)); }
:root[data-theme="dark"] .sed-menu-head { color: #0e0820; }
.sed-menu-body { padding: 13px 14px 15px; display: grid; gap: 9px; }
.sed-mi {
    display: flex; align-items: center; gap: 10px; width: 100%; text-align: left; cursor: pointer; font-family: inherit;
    border: 1px solid var(--sed-line-2); background: var(--sed-panel-2); color: var(--sed-ink);
    border-radius: 12px; padding: 10px 12px; transition: .16s;
}
.sed-mi:hover { border-color: var(--sed-lime); transform: translateX(2px); }
.sed-mi .mi { flex: 0 0 30px; width: 30px; height: 30px; border-radius: 9px; display: grid; place-items: center; font-size: 14px; background: var(--sed-lime-soft); }
.sed-mi b { display: block; font-size: 13.5px; }
.sed-mi small { display: block; font-size: 11.5px; color: var(--sed-ink-3); line-height: 1.6; }
.sed-menu-foot { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.sed-menu-foot button {
    border: 1px solid var(--sed-line-2); background: var(--sed-panel-2); color: var(--sed-ink-2);
    border-radius: 10px; padding: 9px 8px; font-size: 13px; font-weight: 700; font-family: inherit; cursor: pointer; transition: .16s;
}
.sed-menu-foot button:hover { border-color: var(--sed-purple); color: var(--sed-purple); }
.sed-menu-foot button.primary { background: linear-gradient(135deg, var(--sed-purple), var(--sed-purple-2)); border-color: transparent; color: #fff; }
:root[data-theme="dark"] .sed-menu-foot button.primary { color: #0e0820; }

/* ===================== 流水线 ===================== */
.sed-flow { max-width: 900px; margin: 0 auto 22px; }
.sed-card {
    background: var(--sed-panel); border: 1px solid var(--sed-line); border-radius: var(--sed-radius);
    box-shadow: var(--sed-shadow-sm); margin-bottom: 18px; overflow: hidden;
}
.sed-card-head { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; padding: 12px 22px; background: var(--sed-panel-2); border-bottom: 1px solid var(--sed-line); }
.sed-card-head .k { font-size: 11.5px; font-weight: 800; letter-spacing: 1.8px; color: var(--sed-purple); }
.sed-card-head .sp { margin-left: auto; font-size: 12px; color: var(--sed-ink-3); font-weight: 700; }
.sed-card-body { padding: 18px 24px 22px; }

.sed-question { font-size: 18px; line-height: 2.05; color: var(--sed-ink); text-align: center; }
.sed-question b { color: var(--sed-purple); font-weight: 800; }
.sed-eq {
    display: inline-block; margin-top: 12px; font-family: "SFMono-Regular", Consolas, monospace;
    font-size: 26px; font-weight: 800; color: var(--sed-purple); background: var(--sed-purple-soft);
    border: 1px dashed color-mix(in srgb, var(--sed-purple) 36%, transparent);
    border-radius: 12px; padding: 8px 22px; letter-spacing: 1px;
}

/* 天平舞台 */
.sed-stage { padding: 10px 20px 4px; text-align: center; }
.sed-stage svg { display: block; width: 100%; max-width: 620px; height: auto; margin: 0 auto; }
.sed-beam { stroke: var(--sed-purple); stroke-width: 4; stroke-linecap: round; }
.sed-fulcrum { fill: var(--sed-lime); }
.sed-stand { stroke: var(--sed-line-2); stroke-width: 3; stroke-linecap: round; }
.sed-pan { fill: var(--sed-panel-2); stroke: var(--sed-purple); stroke-width: 2; }
.sed-pan--right { stroke: var(--sed-lime); }
.sed-rope { stroke: var(--sed-ink-3); stroke-width: 1.8; opacity: .75; }
.sed-needle { stroke: var(--sed-red); stroke-width: 2.4; stroke-linecap: round; }
.sed-block { font-size: 17px; font-weight: 800; fill: var(--sed-ink); font-family: "SFMono-Regular", Consolas, monospace; }
.sed-block--right { fill: var(--sed-lime-2); }
.sed-bx { fill: var(--sed-panel-2); stroke: var(--sed-purple); stroke-width: 2; }
.sed-bx--right { stroke: var(--sed-lime); fill: var(--sed-lime-soft); }
.sed-bx--x { fill: var(--sed-purple-soft); }
.sed-plabel { font-size: 12px; fill: var(--sed-ink-3); }
.sed-balance-note { font-size: 12.5px; fill: var(--sed-purple); font-weight: 700; }
.sed-balance-note.ok { fill: var(--sed-lime-2); }

/* 推导阶梯 */
.sed-steps { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.sed-step {
    display: grid; grid-template-columns: 30px minmax(0, 1fr); gap: 12px; align-items: start;
    border: 1px solid var(--sed-line); border-radius: 13px; background: var(--sed-panel-2); padding: 12px 14px;
}
.sed-step .sn {
    width: 30px; height: 30px; border-radius: 10px; display: grid; place-items: center;
    font-size: 13px; font-weight: 800; color: #fff; background: var(--sed-purple);
}
:root[data-theme="dark"] .sed-step .sn { color: #0e0820; }
.sed-step.final .sn { background: var(--sed-lime); color: #10240a; }
.sed-step .sc { font-size: 13.5px; line-height: 1.95; color: var(--sed-ink-2); }
.sed-step .sc b { color: var(--sed-ink); }
.sed-step .sc .f { font-family: "SFMono-Regular", Consolas, monospace; font-weight: 800; color: var(--sed-purple); }
.sed-step .sc .why { display: block; margin-top: 3px; font-size: 12px; color: var(--sed-ink-3); }

/* 作答区 */
.sed-answer { display: flex; gap: 12px; align-items: flex-end; flex-wrap: wrap; justify-content: center; }
.sed-field { flex: 0 1 250px; min-width: 170px; }
.sed-label { display: block; font-size: 12px; font-weight: 800; color: var(--sed-ink-3); margin-bottom: 6px; }
.sed-input {
    width: 100%; padding: 12px 14px; border: 1px solid var(--sed-line-2); border-radius: 11px;
    background: var(--sed-panel-2); color: var(--sed-ink); font-size: 19px; font-weight: 800;
    font-family: "SFMono-Regular", Consolas, monospace; text-align: center; transition: border-color .16s, box-shadow .16s;
}
.sed-input:focus { outline: none; border-color: var(--sed-purple); box-shadow: 0 0 0 3px var(--sed-purple-soft); }
.sed-input.ok { border-color: var(--sed-lime); background: var(--sed-lime-soft); }
.sed-input.no { border-color: var(--sed-red); background: var(--sed-red-soft); }
.sed-ans-tip { flex: 1 1 100%; text-align: center; font-size: 12px; color: var(--sed-ink-3); margin: 0; }

.sed-btn {
    border: 1px solid var(--sed-line-2); background: var(--sed-panel-2); color: var(--sed-ink);
    padding: 11px 18px; border-radius: 11px; font-size: 14px; font-weight: 700; font-family: inherit; cursor: pointer;
    transition: transform .14s, border-color .16s;
}
.sed-btn:hover { transform: translateY(-1px); border-color: var(--sed-purple); }
.sed-btn--primary { background: linear-gradient(135deg, var(--sed-purple), var(--sed-purple-2)); border-color: transparent; color: #fff; box-shadow: 0 6px 18px rgba(91, 33, 182, .26); }
:root[data-theme="dark"] .sed-btn--primary { color: #0e0820; }
.sed-btn--lime { background: linear-gradient(135deg, var(--sed-lime), var(--sed-lime-2)); border-color: transparent; color: #fff; box-shadow: 0 6px 18px rgba(101, 163, 13, .26); }
:root[data-theme="dark"] .sed-btn--lime { color: #10240a; }
.sed-btn--sm { padding: 7px 13px; font-size: 13px; border-radius: 9px; }
.sed-btn:disabled { opacity: .5; cursor: not-allowed; transform: none; }

.sed-hints { margin-top: 16px; border: 1px dashed var(--sed-line-2); border-radius: 13px; background: var(--sed-panel-2); overflow: hidden; }
.sed-hints-head { padding: 9px 14px; font-size: 12.5px; font-weight: 800; color: var(--sed-purple); background: var(--sed-purple-soft); }
.sed-hints ol { list-style: none; margin: 0; padding: 0; }
.sed-hints li { display: flex; gap: 9px; padding: 10px 14px; font-size: 13.5px; line-height: 1.9; color: var(--sed-ink-2); border-bottom: 1px dashed var(--sed-line); }
.sed-hints li:last-child { border-bottom: none; }
.sed-hints li .no { flex: 0 0 21px; width: 21px; height: 21px; border-radius: 7px; background: var(--sed-panel); color: var(--sed-purple); font-size: 11.5px; font-weight: 800; display: grid; place-items: center; margin-top: 3px; }
.sed-hints li b { color: var(--sed-ink); }

.sed-feedback { margin-top: 16px; border-radius: 13px; border: 1px solid var(--sed-line); background: var(--sed-panel-2); padding: 15px 17px; display: none; }
.sed-feedback.show { display: block; animation: sedFade .22s ease; }
@keyframes sedFade { from { opacity: 0; transform: translateY(-6px); } to { opacity: 1; transform: none; } }
.sed-feedback.ok { border-color: var(--sed-lime); background: var(--sed-lime-soft); }
.sed-feedback.no { border-color: var(--sed-red); background: var(--sed-red-soft); }
.sed-fb-head { display: flex; align-items: center; gap: 10px; font-size: 15.5px; font-weight: 800; margin-bottom: 9px; }
.sed-feedback.ok .sed-fb-head { color: var(--sed-lime-2); }
.sed-feedback.no .sed-fb-head { color: var(--sed-red); }
.sed-fb-body { font-size: 13.5px; line-height: 1.95; color: var(--sed-ink-2); }
.sed-fb-body b { color: var(--sed-ink); }
.sed-fb-body .k { display: inline-block; background: rgba(255, 255, 255, .6); border-radius: 6px; padding: 1px 7px; font-weight: 800; color: var(--sed-ink); font-family: "SFMono-Regular", Consolas, monospace; }
.sed-check { margin-top: 9px; border: 1px solid var(--sed-line); border-radius: 11px; background: var(--sed-panel); padding: 11px 13px; font-size: 12.5px; line-height: 1.9; color: var(--sed-ink-2); }
.sed-check b { color: var(--sed-lime-2); }

/* ===================== 数据带 ===================== */
.sed-band { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; margin-bottom: 22px; }
.sed-tile { background: var(--sed-panel); border: 1px solid var(--sed-line); border-radius: 16px; box-shadow: var(--sed-shadow-sm); overflow: hidden; }
.sed-tile > header { padding: 11px 16px; background: var(--sed-panel-2); border-bottom: 1px solid var(--sed-line); font-size: 14px; font-weight: 800; display: flex; align-items: center; gap: 8px; }
.sed-tile > header .note { margin-left: auto; font-size: 11.5px; color: var(--sed-ink-3); font-weight: 600; }
.sed-tile-body { padding: 14px 16px 16px; }

.sed-ring-row { display: flex; align-items: center; gap: 14px; }
.sed-ring { position: relative; width: 76px; height: 76px; flex: 0 0 auto; }
.sed-ring svg { transform: rotate(-90deg); display: block; }
.sed-ring .val { position: absolute; inset: 0; display: grid; place-items: center; font-size: 19px; font-weight: 800; color: var(--sed-purple); }
.sed-score-meta { font-size: 13px; color: var(--sed-ink-2); line-height: 1.85; }
.sed-score-meta b { color: var(--sed-ink); font-size: 15px; }

.sed-type-row { display: flex; align-items: center; gap: 9px; padding: 6px 0; font-size: 13px; }
.sed-type-row .nm { flex: 0 0 96px; color: var(--sed-ink-2); font-weight: 700; }
.sed-type-row .track { flex: 1 1 auto; height: 8px; border-radius: 999px; background: var(--sed-panel-3); overflow: hidden; }
.sed-type-row .track i { display: block; height: 100%; border-radius: 999px; background: linear-gradient(90deg, var(--sed-purple), var(--sed-lime)); }
.sed-type-row .track i.low { background: linear-gradient(90deg, var(--sed-red), var(--sed-gold, #b45309)); }
.sed-type-row .pv { flex: 0 0 52px; text-align: right; font-weight: 800; font-size: 12.5px; }

.sed-wrong-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; max-height: 260px; overflow: auto; }
.sed-wrong-item { border: 1px solid var(--sed-line); background: var(--sed-panel-2); border-radius: 10px; padding: 9px 11px; font-size: 12.5px; line-height: 1.7; }
.sed-wrong-item .q { color: var(--sed-ink); font-weight: 700; margin-bottom: 3px; }
.sed-wrong-item .a { color: var(--sed-ink-3); }
.sed-wrong-item .a b { color: var(--sed-lime-2); }
.sed-empty { font-size: 13px; color: var(--sed-ink-3); line-height: 1.85; }

/* ===================== 面板 / 表格 ===================== */
.sed-panel2 { background: var(--sed-panel); border: 1px solid var(--sed-line); border-radius: var(--sed-radius); box-shadow: var(--sed-shadow-sm); margin-bottom: 22px; overflow: hidden; }
.sed-panel2-head { padding: 15px 22px 13px; border-bottom: 1px solid var(--sed-line); background: var(--sed-panel-2); }
.sed-panel2-head .k { font-size: 11.5px; font-weight: 800; letter-spacing: 2px; color: var(--sed-purple); }
.sed-panel2-head h2 { font-size: 19px; margin: 3px 0 4px; }
.sed-panel2-head p { margin: 0; font-size: 13px; color: var(--sed-ink-3); line-height: 1.8; }
.sed-panel2-body { padding: 18px 22px 22px; }

.sed-csv-scroll { overflow-x: auto; border: 1px solid var(--sed-line); border-radius: 12px; background: var(--sed-panel-2); }
.sed-csv-table { width: 100%; border-collapse: collapse; font-size: 12.5px; min-width: 700px; }
.sed-csv-table th { text-align: left; font-size: 11.5px; font-weight: 800; color: var(--sed-ink-3); padding: 9px 11px; background: var(--sed-panel-3); border-bottom: 1px solid var(--sed-line-2); white-space: nowrap; }
.sed-csv-table td { padding: 8px 11px; border-bottom: 1px dashed var(--sed-line); color: var(--sed-ink-2); white-space: nowrap; vertical-align: top; }
.sed-csv-table td.wrap { white-space: normal; min-width: 270px; max-width: 380px; line-height: 1.75; }
.sed-csv-table tr:last-child td { border-bottom: none; }
.sed-csv-table td:first-child { color: var(--sed-ink); font-weight: 800; }
.sed-csv-table td.ok { color: var(--sed-lime-2); font-weight: 800; }
.sed-csv-table td.no { color: var(--sed-red); font-weight: 800; }
.sed-csv-more { margin: 10px 0 0; font-size: 12.5px; color: var(--sed-ink-3); line-height: 1.8; }
.sed-csv-more b { color: var(--sed-purple); }
.sed-export-tip { margin: 14px 0 0; font-size: 12.5px; line-height: 1.9; color: var(--sed-ink-3); background: var(--sed-panel-2); border: 1px dashed var(--sed-line-2); border-radius: 12px; padding: 11px 14px; }

.sed-note-table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
.sed-note-table th, .sed-note-table td { text-align: left; padding: 11px 12px; border-bottom: 1px solid var(--sed-line); vertical-align: top; line-height: 1.85; }
.sed-note-table th { width: 110px; color: var(--sed-ink); font-weight: 800; white-space: nowrap; }
.sed-note-table td { color: var(--sed-ink-2); }
.sed-note-table td b { color: var(--sed-ink); }
.sed-note-table tr:last-child th, .sed-note-table tr:last-child td { border-bottom: none; }

/* ===================== 底部标签页 ===================== */
.sed-tabs { display: flex; gap: 4px; margin: 26px 0 14px; border-bottom: 1px solid var(--sed-line); flex-wrap: wrap; }
.sed-tab { border: 0; background: none; cursor: pointer; font-family: inherit; font-size: 14px; font-weight: 700; color: var(--sed-ink-3); padding: 10px 16px; position: relative; transition: color .18s; }
.sed-tab:hover { color: var(--sed-purple); }
.sed-tab.active { color: var(--sed-purple); }
.sed-tab.active::after { content: ""; position: absolute; left: 12px; right: 12px; bottom: -1px; height: 3px; border-radius: 3px 3px 0 0; background: linear-gradient(90deg, var(--sed-purple), var(--sed-lime)); }
.sed-tabpane { display: none; background: var(--sed-panel); border: 1px solid var(--sed-line); border-radius: var(--sed-radius); padding: 24px 26px; box-shadow: var(--sed-shadow-sm); }
.sed-tabpane.active { display: block; animation: sedFade .26s ease; }
.sed-tabpane h2 { font-size: 17px; margin: 0 0 12px; }
.sed-tabpane h2:not(:first-child) { margin-top: 24px; }
.sed-tabpane p, .sed-tabpane li { font-size: 14px; line-height: 1.95; color: var(--sed-ink-2); }
.sed-tabpane p b, .sed-tabpane li b { color: var(--sed-ink); }
.sed-tabpane ol { padding-left: 20px; margin: 0; }
.sed-timeline { list-style: none; padding: 0; margin: 0; }
.sed-timeline li { display: flex; gap: 12px; align-items: baseline; margin-bottom: 12px; }
.sed-timeline .ver { font-weight: 800; color: var(--sed-purple); flex: none; }
.sed-timeline .date { color: var(--sed-ink-3); font-size: 12.5px; flex: none; width: 86px; }
.sed-timeline .txt { font-size: 13.5px; line-height: 1.8; color: var(--sed-ink-2); }
.sed-faq details { border: 1px solid var(--sed-line); border-radius: 12px; padding: 0 16px; margin-bottom: 10px; background: var(--sed-panel-2); }
.sed-faq summary { cursor: pointer; font-size: 14px; font-weight: 700; padding: 13px 0; list-style: none; color: var(--sed-ink); }
.sed-faq summary::-webkit-details-marker { display: none; }
.sed-faq summary::after { content: "＋"; float: right; color: var(--sed-purple); font-weight: 800; }
.sed-faq details[open] summary::after { content: "－"; }
.sed-faq .a { padding: 0 0 14px; font-size: 13.5px; line-height: 1.95; color: var(--sed-ink-2); }
.sed-faq .a b { color: var(--sed-ink); }

.sed-related { margin-top: 26px; }
.sed-related h2 { font-size: 18px; margin-bottom: 14px; }
.sed-rel-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px; }
.sed-rel { display: flex; align-items: center; gap: 11px; padding: 14px 16px; background: var(--sed-panel); border: 1px solid var(--sed-line); border-radius: 14px; text-decoration: none; color: var(--sed-ink); box-shadow: var(--sed-shadow-sm); transition: transform .18s, border-color .18s; }
.sed-rel:hover { transform: translateY(-3px); border-color: var(--sed-purple); }
.sed-rel .ri { font-size: 22px; }
.sed-rel b { font-size: 14px; display: block; }
.sed-rel small { font-size: 12px; color: var(--sed-ink-3); }
.sed-foot { margin: 26px 0 0; text-align: center; font-size: 12.5px; color: var(--sed-ink-3); line-height: 1.9; }

.sed-toast {
    position: fixed; left: 50%; bottom: 30px; transform: translate(-50%, 12px);
    background: rgba(34, 20, 62, .95); color: #efe9fb; padding: 11px 20px; border-radius: 12px;
    font-size: 14px; box-shadow: 0 10px 28px rgba(0, 0, 0, .3); opacity: 0; pointer-events: none;
    transition: .22s; z-index: 99998; max-width: 88vw; text-align: center;
}
.sed-toast.show { opacity: 1; transform: translate(-50%, 0); }

/* ===================== 响应式 ===================== */
@media (max-width: 1080px) {
    .sed-hero-grid { grid-template-columns: 1fr; }
}
@media (max-width: 700px) {
    .sed-hero { padding: 24px 18px 22px; }
    .sed-hero h1 { font-size: 25px; }
    .sed-card-body { padding: 15px 16px 18px; }
    .sed-question { font-size: 16px; }
    .sed-eq { font-size: 21px; padding: 7px 16px; }
    .sed-panel2-body { padding: 14px 16px 18px; }
    .sed-tabpane { padding: 18px 16px; }
}

/* ===================== 打印 ===================== */
.sed-print-only { display: none; }
@media print {
    @page { size: A4 portrait; margin: 12mm 10mm; }
    .sed-page { background: #fff !important; }
    .sed-hero, .sed-panel2, .sed-band, .sed-toast, .sed-foot, .sed-tabs, .sed-tabpane, .sed-flow { display: none !important; }
    .sed-print-only { display: block !important; }
    .sed-flow { max-width: none; }
    .sed-card { border: none; box-shadow: none; }
    .sed-print-head { display: block !important; text-align: center; margin-bottom: 5mm; font-size: 15px; font-weight: 800; }
    .sed-print-head small { display: block; font-size: 11px; font-weight: 600; color: #555; margin-top: 2mm; }
    .sed-sheet-item { break-inside: avoid; page-break-inside: avoid; border-bottom: 1px solid #ccc; padding: 3mm 0; }
    .sed-sheet-item .qq { font-size: 13px; color: #111; }
    .sed-sheet-item .aa { font-size: 12px; color: #555; margin-top: 1mm; }
}