/* ============================================================
   竖式计算练习卡 · 纸张 / 墨绿风格
   ============================================================ */

.vc-app {
    --vc-bg: #f4f0e6;
    --vc-card: #fffdf8;
    --vc-ink: #1d2a25;
    --vc-ink-2: #45554d;
    --vc-muted: #7b8a81;
    --vc-line: #e3dccd;
    --vc-line-strong: #cfc6b3;
    --vc-accent: #1f6f5c;
    --vc-accent-ink: #14513f;
    --vc-accent-soft: #e4f1ec;
    --vc-warm: #c2410c;
    --vc-desk: #ece5d6;
    --vc-shadow: 0 12px 32px rgba(42, 55, 47, .09);
    --vc-serif: "Noto Serif SC", "Songti SC", "SimSun", "STSong", serif;

    background:
        radial-gradient(circle at 18% 0%, rgba(31, 111, 92, .07), transparent 34%),
        radial-gradient(circle at 88% 12%, rgba(194, 65, 12, .05), transparent 30%),
        var(--vc-bg);
    color: var(--vc-ink);
    padding-bottom: 64px;
}

[data-theme="dark"] .vc-app {
    --vc-bg: #0d1310;
    --vc-card: #141d18;
    --vc-ink: #e9e5d9;
    --vc-ink-2: #b9b6a9;
    --vc-muted: #8a887c;
    --vc-line: #28332c;
    --vc-line-strong: #3a473f;
    --vc-accent: #63c9ab;
    --vc-accent-ink: #9ee4cf;
    --vc-accent-soft: #16322a;
    --vc-warm: #f08a5d;
    --vc-desk: #0a100d;
    --vc-shadow: 0 16px 40px rgba(0, 0, 0, .45);
    background:
        radial-gradient(circle at 15% 0%, rgba(99, 201, 171, .08), transparent 36%),
        radial-gradient(circle at 90% 10%, rgba(240, 138, 93, .05), transparent 30%),
        var(--vc-bg);
}

.vc-app .container { max-width: 1240px; }

/* ---------- 首屏 ---------- */
.vc-hero {
    display: grid;
    grid-template-columns: minmax(0, 1.35fr) 300px;
    gap: 32px;
    align-items: center;
    padding: 10px 0 28px;
}

.vc-kicker {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 12px;
    border: 1px solid var(--vc-line-strong);
    border-radius: 999px;
    background: var(--vc-card);
    color: var(--vc-accent-ink);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: .5px;
}

.vc-hero h1 {
    margin: 14px 0 10px;
    font-family: var(--vc-serif);
    font-size: clamp(30px, 4.4vw, 46px);
    font-weight: 800;
    letter-spacing: -.02em;
    line-height: 1.15;
    color: var(--vc-ink);
}
.vc-hero h1 em {
    font-style: normal;
    color: var(--vc-accent);
    background: linear-gradient(transparent 62%, var(--vc-accent-soft) 62%);
    padding: 0 2px;
}

.vc-hero p {
    max-width: 640px;
    margin: 0;
    font-size: 15.5px;
    line-height: 1.85;
    color: var(--vc-ink-2);
}
.vc-hero p b { color: var(--vc-ink); }

.vc-points {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 18px;
    margin: 18px 0 0;
    padding: 0;
    list-style: none;
}
.vc-points li {
    position: relative;
    padding-left: 18px;
    font-size: 12.5px;
    font-weight: 600;
    color: var(--vc-ink-2);
}
.vc-points li::before {
    content: "";
    position: absolute;
    left: 2px; top: 7px;
    width: 6px; height: 6px;
    border-radius: 2px;
    background: var(--vc-accent);
    transform: rotate(45deg);
}

.vc-hero-sample {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    padding: 22px 18px;
    border: 1px solid var(--vc-line);
    border-radius: 20px;
    background: var(--vc-card);
    box-shadow: var(--vc-shadow);
    transform: rotate(1.2deg);
}
.vc-mini {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 16px 20px;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 6px 18px rgba(0, 0, 0, .1);
}
.vc-mini-label {
    font-size: 11.5px;
    font-weight: 700;
    letter-spacing: 1px;
    color: var(--vc-muted);
}

/* ---------- 工作区 ---------- */
.vc-work {
    display: grid;
    grid-template-columns: 372px minmax(0, 1fr);
    gap: 22px;
    align-items: start;
}

.vc-panel {
    background: var(--vc-card);
    border: 1px solid var(--vc-line);
    border-radius: 20px;
    box-shadow: var(--vc-shadow);
}

.vc-controls {
    position: sticky;
    top: 82px;
    padding: 6px 20px 18px;
}

.vc-step {
    display: grid;
    grid-template-columns: 34px minmax(0, 1fr);
    gap: 12px;
    padding: 18px 0;
}
.vc-step + .vc-step { border-top: 1px dashed var(--vc-line); }

.vc-step-no {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px; height: 28px;
    margin-top: 2px;
    border-radius: 9px;
    background: var(--vc-accent-soft);
    color: var(--vc-accent-ink);
    font-size: 12px;
    font-weight: 800;
    font-family: Georgia, serif;
}

.vc-step-body h2 {
    margin: 0 0 12px;
    font-family: var(--vc-serif);
    font-size: 16px;
    font-weight: 800;
    color: var(--vc-ink);
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 6px;
}
.vc-sub { font-size: 11px; font-weight: 600; color: var(--vc-muted); }

.vc-row {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}
.vc-row select,
.vc-field input,
.vc-step textarea,
.vc-step input[type="text"] {
    width: 100%;
    min-width: 0;
    padding: 9px 11px;
    border: 1px solid var(--vc-line-strong);
    border-radius: 10px;
    background: var(--vc-bg);
    color: var(--vc-ink);
    font-family: inherit;
    font-size: 13px;
    line-height: 1.4;
    outline: none;
    transition: border-color .15s, box-shadow .15s;
}
.vc-row select { width: auto; flex: 1; min-width: 96px; }
.vc-row select:focus,
.vc-step textarea:focus,
.vc-step input:focus {
    border-color: var(--vc-accent);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--vc-accent) 18%, transparent);
}
.vc-step textarea { resize: vertical; min-height: 84px; }

.vc-label {
    flex: none;
    font-size: 12px;
    font-weight: 700;
    color: var(--vc-muted);
}

.vc-meta {
    display: flex;
    justify-content: space-between;
    gap: 10px;
    margin: 10px 0 0;
    font-size: 11.5px;
    color: var(--vc-muted);
}

.vc-chips {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 6px;
    max-height: 262px;
    overflow-y: auto;
    margin-top: 9px;
    padding: 2px 4px 4px 2px;
    scrollbar-width: thin;
}
.vc-chip {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1px;
    padding: 6px 2px;
    border: 1px solid var(--vc-line);
    border-radius: 9px;
    background: transparent;
    color: var(--vc-ink-2);
    font-family: inherit;
    font-size: 13px;
    font-weight: 700;
    cursor: pointer;
    transition: all .14s;
}
.vc-chip i {
    font-style: normal;
    font-family: "Segoe UI", "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
    font-size: 9.5px;
    font-weight: 400;
    color: var(--vc-muted);
    letter-spacing: .2px;
    white-space: nowrap;
}
.vc-chip:hover { border-color: var(--vc-accent); }
.vc-chip.on {
    border-color: var(--vc-accent);
    background: var(--vc-accent-soft);
    color: var(--vc-accent-ink);
}
.vc-chip.on i { color: var(--vc-accent); }

.vc-row-actions { margin-top: 10px; }
.vc-link {
    padding: 0;
    border: 0;
    background: none;
    color: var(--vc-accent);
    font-family: inherit;
    font-size: 12px;
    font-weight: 700;
    cursor: pointer;
    text-decoration: underline;
    text-underline-offset: 3px;
}
.vc-link:hover { color: var(--vc-warm); }

.vc-tip {
    margin: 10px 0 0;
    font-size: 11.5px;
    line-height: 1.65;
    color: var(--vc-muted);
}

.vc-field { margin-bottom: 11px; }
.vc-field:last-child { margin-bottom: 0; }
.vc-field > .vc-label { display: block; margin-bottom: 6px; }

.vc-seg {
    display: flex;
    padding: 3px;
    border-radius: 10px;
    background: var(--vc-bg);
    border: 1px solid var(--vc-line);
    gap: 3px;
}
.vc-seg button {
    flex: 1;
    padding: 6px 4px;
    border: 0;
    border-radius: 7px;
    background: transparent;
    color: var(--vc-ink-2);
    font-family: inherit;
    font-size: 12px;
    font-weight: 700;
    cursor: pointer;
    transition: all .14s;
}
.vc-seg button.on {
    background: var(--vc-card);
    color: var(--vc-accent-ink);
    box-shadow: 0 1px 4px rgba(30, 45, 38, .12);
}

.vc-switches {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 16px;
    margin-top: 4px;
}
.vc-check {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    font-weight: 600;
    color: var(--vc-ink-2);
    cursor: pointer;
}
.vc-check input { accent-color: var(--vc-accent); width: 15px; height: 15px; }

.vc-status {
    min-height: 18px;
    margin: 8px 0 0;
    font-size: 11.5px;
    line-height: 1.6;
    color: var(--vc-muted);
}
.vc-status.ok { color: var(--vc-accent); }
.vc-status.warn { color: #b45309; }
.vc-status.bad { color: #dc2626; }
[data-theme="dark"] .vc-status.warn { color: #fbbf24; }
[data-theme="dark"] .vc-status.bad { color: #f87171; }

.vc-ai {
    border-radius: 14px;
    margin: 4px 0;
    padding: 14px 12px;
    background: var(--vc-accent-soft);
    border: 1px dashed color-mix(in srgb, var(--vc-accent) 40%, transparent);
}
.vc-ai .vc-step-no { background: var(--vc-card); }
.vc-ai .vc-step-body h2 { margin-bottom: 8px; }
.vc-ai input { margin-bottom: 8px; background: var(--vc-card); }
.vc-beta {
    padding: 1px 6px;
    border-radius: 999px;
    background: var(--vc-warm);
    color: #fff;
    font-family: inherit;
    font-size: 9px;
    letter-spacing: .5px;
}

.vc-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 14px;
    border: 1px solid transparent;
    border-radius: 11px;
    background: var(--vc-accent);
    color: #fff;
    font-family: inherit;
    font-size: 13px;
    font-weight: 800;
    cursor: pointer;
    transition: transform .1s, filter .15s, background .15s;
}
.vc-btn:hover { filter: brightness(1.06); }
.vc-btn:active { transform: translateY(1px); }
.vc-btn:disabled { opacity: .55; cursor: not-allowed; }
.vc-btn-ghost {
    background: transparent;
    border-color: var(--vc-line-strong);
    color: var(--vc-ink-2);
}
.vc-btn-main { width: 100%; padding: 12px 14px; font-size: 14px; }

.vc-actions {
    display: grid;
    gap: 8px;
    padding-top: 16px;
    border-top: 1px solid var(--vc-line);
}

/* ---------- 预览桌面 ---------- */
.vc-desk {
    min-width: 0;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    border-radius: 22px;
    background:
        radial-gradient(circle, rgba(120, 113, 92, .18) 1px, transparent 1px) 0 0 / 18px 18px,
        var(--vc-desk);
    border: 1px solid var(--vc-line);
    padding: 16px;
}
[data-theme="dark"] .vc-desk {
    background:
        radial-gradient(circle, rgba(255, 255, 255, .06) 1px, transparent 1px) 0 0 / 18px 18px,
        var(--vc-desk);
}

.vc-desk-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 2px 4px 12px;
}
.vc-desk-title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    font-weight: 800;
    color: var(--vc-ink-2);
}
.vc-desk-title span {
    padding: 2px 8px;
    border-radius: 999px;
    background: var(--vc-card);
    border: 1px solid var(--vc-line);
    font-size: 11px;
    font-weight: 700;
    color: var(--vc-muted);
}
.vc-desk-head .vc-btn { padding: 8px 12px; font-size: 12px; }
.vc-scroll-hint {
    display: none;
    font-style: normal;
    font-size: 10.5px;
    font-weight: 600;
    color: var(--vc-muted);
}
/* 只有在纸张确实宽于可视区（缩放已到下限）时才提示左右滑动 */
.vc-desk.is-scrollable .vc-scroll-hint { display: inline; }

.vc-pages {
    --vc-scale: .62;
    padding: 4px 0 10px;
}

.vc-sheet-wrap {
    position: relative;
    margin: 0 auto 20px;
    overflow: hidden;
    border-radius: 3px;
    box-shadow: 0 18px 44px rgba(23, 32, 27, .22);
}
[data-theme="dark"] .vc-sheet-wrap { box-shadow: 0 18px 44px rgba(0, 0, 0, .55); }

.vc-sheet {
    box-sizing: border-box;
    width: 794px;
    height: 1123px;
    padding: 13mm;
    transform: scale(var(--vc-scale));
    transform-origin: top left;
    background: #fff;
    color: #0f172a;
    font-family: "Songti SC", "SimSun", "Noto Serif SC", serif;
    display: flex;
    flex-direction: column;
}

.vc-sheet-head {
    text-align: center;
    padding-bottom: 6mm;
    border-bottom: 1px solid #cbd5e1;
}
.vc-sheet-head h2 {
    margin: 0 0 2.5mm;
    font-family: "Songti SC", "SimSun", "Noto Serif SC", serif;
    font-size: 20pt;
    font-weight: 700;
    letter-spacing: 4px;
    color: #111827;
}
.vc-sheet-head h2.ans-title { letter-spacing: 2px; }
.vc-sheet-head p {
    margin: 0;
    font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
    font-size: 9pt;
    color: #64748b;
    letter-spacing: .5px;
}

.vc-fields {
    display: flex;
    justify-content: space-between;
    gap: 8mm;
    margin-top: 5mm;
    font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
    font-size: 10pt;
    color: #334155;
}
.vc-fields span {
    display: inline-flex;
    align-items: flex-end;
    gap: 4px;
    flex: 1;
    white-space: nowrap;
}
.vc-fields i {
    flex: 1;
    height: 5mm;
    border-bottom: 1px solid #94a3b8;
}

.vc-grid {
    flex: 1;
    display: grid;
    grid-template-columns: repeat(var(--vc-per-row), minmax(0, 1fr));
    gap: 4mm 3mm;
    align-content: start;
    padding-top: 7mm;
}
.vc-grid.is-sm { gap: 3mm; }

.vc-item {
    display: flex;
    justify-content: center;
    align-items: flex-end;
    min-width: 0;
    break-inside: avoid;
}
.vc-word {
    display: inline-flex;
    align-items: flex-end;
    gap: 1.5mm;
}
.vc-ch {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1mm;
}
.vc-py {
    height: 5mm;
    font-family: "Segoe UI", "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
    font-size: 8.5pt;
    line-height: 5mm;
    letter-spacing: .2px;
    color: #334155;
    white-space: nowrap;
}
.vc-cell {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    box-sizing: border-box;
    width: var(--vc-cell);
    height: var(--vc-cell);
    border: 1px solid #475569;
    background: #fff;
}
.vc-cell::before,
.vc-cell::after {
    content: "";
    position: absolute;
    border-color: #cbd5e1;
    border-style: dashed;
    border-width: 0;
    pointer-events: none;
}
.vc-cell::before { left: 0; right: 0; top: 50%; border-top-width: 1px; }
.vc-cell::after { top: 0; bottom: 0; left: 50%; border-left-width: 1px; }

.vc-cell b {
    font-family: KaiTi, STKaiti, "Kaiti SC", "Songti SC", serif;
    font-size: calc(var(--vc-cell) * .62);
    font-weight: 400;
    line-height: 1;
    color: #111827;
    transform: translateY(1px);
}

.vc-sheet-ans .vc-grid { padding-top: 9mm; }
.vc-sheet-ans .vc-cell { border-color: #94a3b8; }

.vc-sheet-foot {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 4mm;
    padding-top: 3mm;
    border-top: 1px solid #e2e8f0;
    font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
    font-size: 8pt;
    color: #94a3b8;
}
.vc-sheet-foot span { letter-spacing: .5px; }

.vc-empty {
    margin: 40px auto;
    max-width: 460px;
    padding: 34px 24px;
    text-align: center;
    border: 1px dashed var(--vc-line-strong);
    border-radius: 16px;
    background: color-mix(in srgb, var(--vc-card) 75%, transparent);
    color: var(--vc-muted);
}
.vc-empty strong {
    display: block;
    margin-bottom: 6px;
    font-family: var(--vc-serif);
    font-size: 16px;
    color: var(--vc-ink-2);
}
.vc-empty p { margin: 0; font-size: 12.5px; line-height: 1.7; }

/* ---------- 内容区 ---------- */
.vc-content {
    margin-top: 40px;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
}
.vc-note {
    padding: 22px 24px;
    border: 1px solid var(--vc-line);
    border-radius: 18px;
    background: var(--vc-card);
}
.vc-note h2 {
    margin: 0 0 12px;
    font-family: var(--vc-serif);
    font-size: 18px;
    font-weight: 800;
    color: var(--vc-ink);
}
.vc-note h3 {
    margin: 14px 0 6px;
    font-size: 13px;
    font-weight: 800;
    color: var(--vc-ink-2);
}
.vc-note p, .vc-note li {
    font-size: 13px;
    line-height: 1.85;
    color: var(--vc-ink-2);
}
.vc-note p { margin: 0 0 8px; }
.vc-note ul, .vc-note ol { margin: 0; padding-left: 20px; }
.vc-note li { margin-bottom: 5px; }
.vc-note b { color: var(--vc-ink); }
.vc-note .vc-warm { color: var(--vc-warm); }

.vc-steps {
    display: grid;
    gap: 10px;
    margin: 0;
    padding: 0;
    list-style: none;
    counter-reset: pwstep;
}
.vc-steps li {
    position: relative;
    padding-left: 34px;
    font-size: 13px;
    line-height: 1.75;
    color: var(--vc-ink-2);
    counter-increment: pwstep;
}
.vc-steps li::before {
    content: counter(pwstep);
    position: absolute;
    left: 0; top: 1px;
    width: 22px; height: 22px;
    border-radius: 7px;
    background: var(--vc-accent-soft);
    color: var(--vc-accent-ink);
    font-size: 11px;
    font-weight: 800;
    line-height: 22px;
    text-align: center;
}

.vc-faq details {
    border-top: 1px dashed var(--vc-line);
    padding: 10px 0;
}
.vc-faq details:first-of-type { border-top: 0; }
.vc-faq summary {
    cursor: pointer;
    font-size: 13.5px;
    font-weight: 800;
    color: var(--vc-ink-2);
    list-style: none;
    display: flex;
    justify-content: space-between;
    gap: 10px;
}
.vc-faq summary::-webkit-details-marker { display: none; }
.vc-faq summary::after {
    content: "+";
    color: var(--vc-accent);
    font-size: 16px;
    font-weight: 700;
}
.vc-faq details[open] summary::after { content: "−"; }
.vc-faq details p { margin: 8px 0 0; font-size: 12.5px; color: var(--vc-muted); }

.vc-links {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 4px;
}
.vc-links a {
    padding: 6px 11px;
    border: 1px solid var(--vc-line);
    border-radius: 999px;
    background: var(--vc-bg);
    color: var(--vc-ink-2);
    font-size: 12px;
    font-weight: 700;
    text-decoration: none;
}
.vc-links a:hover { border-color: var(--vc-accent); color: var(--vc-accent); }

/* ---------- 响应式 ---------- */
@media (max-width: 1080px) {
    .vc-work { grid-template-columns: 330px minmax(0, 1fr); }
    .vc-hero { grid-template-columns: minmax(0, 1fr) 250px; }
}

@media (max-width: 920px) {
    .vc-hero { grid-template-columns: minmax(0, 1fr); gap: 18px; }
    .vc-hero-sample { display: none; }
    .vc-work { grid-template-columns: minmax(0, 1fr); }
    .vc-controls { position: static; }
    .vc-content { grid-template-columns: minmax(0, 1fr); }
    .vc-chips { grid-template-columns: repeat(4, minmax(0, 1fr)); max-height: 150px; }
    .vc-desk { padding: 10px; }
}

@media (max-width: 560px) {
    .vc-app { padding-bottom: 40px; }
    .vc-hero { padding-top: 0; }
    .vc-hero h1 { font-size: 30px; }
    .vc-hero p { font-size: 14px; }
    .vc-controls { padding: 2px 14px 14px; }
    .vc-chips { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .vc-chip { font-size: 12.5px; }
    .vc-desk-head { flex-wrap: wrap; }
    .vc-sheet-wrap { border-radius: 2px; }
}

/* ---------- 卷内排版：竖式 ---------- */
.vc-sheet-body {
    flex: 1;
    min-height: 0;
    overflow: hidden;
}

.vc-grid {
    --vc-cell: 5.6mm;
    --vc-digit: 9mm;
    --vc-cell-h: 9mm;
    --vc-partial-h: 7mm;
    display: grid;
    grid-template-columns: repeat(var(--vc-cols, 2), minmax(0, 1fr));
    gap: 5mm 6mm;
    align-content: start;
    padding: 9mm 2mm 0;
}
.vc-sheet.is-lg .vc-grid {
    --vc-cell: 7mm;
    --vc-digit: 11mm;
    --vc-cell-h: 12mm;
    --vc-partial-h: 8.5mm;
    gap: 6mm 6mm;
}
.vc-sheet.is-sm .vc-grid {
    --vc-cell: 4.6mm;
    --vc-digit: 7.5mm;
    --vc-cell-h: 7mm;
    --vc-partial-h: 5.5mm;
    gap: 4mm 5mm;
    padding-top: 7mm;
}

.vc-prob {
    position: relative;
    min-width: 0;
    break-inside: avoid;
    display: flex;
    justify-content: center;
}
.vc-no {
    position: absolute;
    left: 0;
    top: 0;
    font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
    font-size: 8.5pt;
    color: #94a3b8;
}

/* 数字格：等宽右对齐，保证数位对齐 */
.vc-col {
    display: flex;
    flex-direction: column;
    gap: 1.2mm;
}
.vc-srow {
    display: flex;
    justify-content: flex-end;
    align-items: flex-end;
}
.vc-srow i {
    font-family: "Segoe UI", "Microsoft YaHei", Arial, sans-serif;
    font-style: normal;
    font-weight: 600;
    font-size: var(--vc-digit);
    line-height: 1;
    width: var(--vc-cell);
    height: var(--vc-cell-h);
    display: flex;
    align-items: flex-end;
    justify-content: center;
    padding-bottom: .8mm;
    box-sizing: border-box;
    color: #111827;
}
.vc-srow .op {
    font-family: "Segoe UI", "Microsoft YaHei", Arial, sans-serif;
    font-size: calc(var(--vc-digit) * .72);
    font-weight: 700;
    line-height: 1;
    width: 7mm;
    padding-bottom: .8mm;
    text-align: center;
    color: #334155;
}
/* 第二个数的下面画横线 */
.vc-srow.rule { min-height: 2mm; }
.vc-srow.rule i {
    height: 2mm;
    border-bottom: 1.5px solid #111827;
}
/* 乘法的部分积层：稍小一号 */
.vc-srow.partial i {
    height: var(--vc-partial-h);
    font-size: calc(var(--vc-digit) * .8);
}
/* 练习卷上待填的格子：虚线占位 */
.vc-srow i.w {
    border-bottom: 1px dashed #b9c4d2;
}
.vc-srow.ans i.w { border-bottom-color: #cbd5e1; }

/* 除法竖式：商在框顶，除数在框左；整体紧凑居中 */
.vc-divwrap {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    width: max-content;
    max-width: 100%;
    padding-left: 7mm;
}
.vc-srow.qrow { margin-bottom: .8mm; }
.vc-srow.qrow i { height: 8mm; }
.vc-srow.qrow i.w {
    border: 1px dashed #b9c4d2;
    border-radius: 1mm;
    background: #f8fafc;
}
.vc-drow { display: flex; align-items: center; }
.vc-dsr {
    font-family: "Segoe UI", "Microsoft YaHei", Arial, sans-serif;
    font-size: var(--vc-digit);
    font-weight: 600;
    line-height: 1;
    padding: 0 2.6mm 0 0;
    color: #111827;
}
.vc-dnd {
    display: flex;
    justify-content: flex-end;
    border-top: 1.5px solid #111827;
    border-left: 1.5px solid #111827;
    border-radius: 0 .8mm 0 0;
    padding: 1mm 1.2mm 0;
    min-height: calc(var(--vc-cell-h) + 1mm);
    box-sizing: content-box;
}
.vc-dnd i {
    font-family: "Segoe UI", "Microsoft YaHei", Arial, sans-serif;
    font-style: normal;
    font-weight: 600;
    font-size: var(--vc-digit);
    line-height: 1;
    width: var(--vc-cell);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #111827;
}
.vc-work {
    align-self: stretch;
    height: calc(var(--vc-cell-h) * 1.5);
}
.vc-rem {
    margin: 0;
    font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
    font-size: 8pt;
    color: #334155;
}

/* 首屏小样：一道迷你竖式 */
.vc-mini-rows {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 3px;
    min-width: 74px;
}
.vc-mini-rows i {
    font-style: normal;
    font-weight: 700;
    font-family: "Segoe UI", Consolas, "Microsoft YaHei", Arial, sans-serif;
    font-size: 17px;
    line-height: 1.25;
    letter-spacing: 3px;
    text-align: right;
    color: #111827;
}
.vc-mini-rows i.op { color: #334155; }
.vc-mini-rows i.r {
    border-top: 1.5px solid #111827;
    padding-top: 3px;
    min-width: 100%;
}

.vc-seg-5 button { padding: 7px 5px; font-size: 11.5px; }

/* 卷型下方的二级设置（进位退位 / 除法余数 / AI 出题）与上面的选择隔开一点 */
#vcCarryField, #vcRemField, #vcAiField { margin-top: 14px; }

/* AI 出题行 */
.vc-airow {
    display: flex;
    gap: 8px;
}
.vc-airow input {
    flex: 1;
    min-width: 0;
    padding: 9px 12px;
    border: 1px solid #d7dee8;
    border-radius: 8px;
    font-size: 13px;
    font-family: inherit;
    color: #1f2937;
    background: #fff;
}
.vc-airow input:focus {
    outline: none;
    border-color: #0f766e;
    box-shadow: 0 0 0 3px rgba(15, 118, 110, .12);
}
.vc-btn-ai {
    flex: 0 0 auto;
    border: 1px solid #0f766e;
    background: #ecfdf5;
    color: #0f766e;
    font-weight: 700;
    padding: 0 14px;
    border-radius: 8px;
    font-size: 12.5px;
    cursor: pointer;
    white-space: nowrap;
}
.vc-btn-ai:hover:not(:disabled) { background: #d1fae5; }
.vc-btn-ai:disabled { opacity: .55; cursor: wait; }
#vcAiMsg.is-err { color: #b91c1c; }

/* ---------- 打印 ---------- */
@media print {
    @page { size: A4; margin: 0; }

    html, body {
        background: #fff !important;
        margin: 0 !important;
        padding: 0 !important;
    }
    body > *:not(.vc-app) { display: none !important; }

    .vc-app {
        position: static !important;
        width: 100% !important;
        padding: 0 !important;
        margin: 0 !important;
        background: #fff !important;
        color: #000 !important;
    }
    .vc-app .container,
    .vc-work,
    .vc-desk,
    .vc-pages {
        display: block !important;
        width: auto !important;
        max-width: none !important;
        height: auto !important;
        margin: 0 !important;
        padding: 0 !important;
        border: 0 !important;
        background: #fff !important;
        box-shadow: none !important;
        border-radius: 0 !important;
    }
    .vc-hero,
    .vc-controls,
    .vc-desk-head,
    .vc-content,
    .vc-noprint,
    .detail-breadcrumb,
    .back-to-top {
        display: none !important;
    }

    .vc-sheet-wrap {
        width: auto !important;
        height: auto !important;
        margin: 0 !important;
        border-radius: 0 !important;
        box-shadow: none !important;
        overflow: visible !important;
        page-break-after: always;
        break-after: page;
    }
    .vc-sheet-wrap:last-child { page-break-after: auto; break-after: auto; }

    .vc-sheet {
        width: 210mm !important;
        height: 296.6mm !important;
        overflow: hidden !important;
        transform: none !important;
        box-shadow: none !important;
        border-radius: 0 !important;
        margin: 0 !important;
        page-break-inside: avoid;
        break-inside: avoid;
    }

    .vc-sheet-head h2, .vc-sheet-head p, .vc-fields { color: #000 !important; }
    .vc-sheet-foot { color: #6b7280 !important; }

    /* 打印时线条加深，虚线格子改实线更清晰 */
    .vc-srow.rule i { border-bottom-color: #000 !important; }
    .vc-srow i.w { border-bottom: 1px solid #9ca3af !important; }
    .vc-srow i, .vc-srow .op, .vc-dsr, .vc-dnd i { color: #000 !important; }
    .vc-dnd { border-color: #000 !important; }
    .vc-no { color: #6b7280 !important; }
    .vc-rem { color: #000 !important; }
}