/* ============================================================
 * learning-tablet-worth-calc.css —— 学习机与家教机值不值计算器
 * 主题：「书房台灯」——靛蓝书脊 + 琥珀灯光 + 米纸质感
 * 与工具1（童趣科技风）完全错开；组件底座用 neo.css
 * ============================================================ */

.ltw-page {
    --neo-accent: #4338ca;
    --neo-accent-2: #6366f1;
    --neo-grad: linear-gradient(135deg, #6366f1 0%, #4338ca 52%, #1e1b4b 100%);
    --neo-bg: #f6f3ec;

    --ltw-ink: #1e1b4b;
    --ltw-amber: #b45309;
    --ltw-amber-soft: #fef3c7;
    --ltw-green: #047857;
    --ltw-green-soft: #d1fae5;
    --ltw-red: #be123c;
    --ltw-red-soft: #ffe4e6;
    --ltw-line: rgba(67, 56, 202, 0.16);
    --ltw-soft: rgba(67, 56, 202, 0.055);
    --ltw-soft2: rgba(67, 56, 202, 0.12);
    --ltw-serif: "Songti SC", "STSong", Georgia, "Times New Roman", serif;
    --ltw-num: "DIN Alternate", "Bahnschrift", "Helvetica Neue", Arial, sans-serif;
}

[data-theme="dark"] .ltw-page {
    --neo-accent: #a5b4fc;
    --neo-accent-2: #c7d2fe;
    --neo-grad: linear-gradient(135deg, #1e1b4b 0%, #3730a3 50%, #6366f1 100%);
    --neo-bg: #0f1117;

    --ltw-ink: #e0e7ff;
    --ltw-amber: #fbbf24;
    --ltw-amber-soft: rgba(251, 191, 36, 0.14);
    --ltw-green: #34d399;
    --ltw-green-soft: rgba(52, 211, 153, 0.14);
    --ltw-red: #fb7185;
    --ltw-red-soft: rgba(251, 113, 133, 0.14);
    --ltw-line: rgba(165, 180, 252, 0.22);
    --ltw-soft: rgba(165, 180, 252, 0.07);
    --ltw-soft2: rgba(165, 180, 252, 0.14);
}

/* ---------- Hero：台灯下的书桌 ---------- */
.ltw-hero {
    position: relative;
    overflow: hidden;
    border-radius: 22px;
    padding: 28px 30px 24px;
    color: #fff;
    background:
        radial-gradient(420px 220px at 82% -10%, rgba(251, 191, 36, .35), transparent 70%),
        linear-gradient(135deg, #312e81 0%, #4338ca 52%, #1e1b4b 100%);
    box-shadow: var(--neo-shadow-lg);
    margin-bottom: 18px;
}
.ltw-hero::after {
    content: "";
    position: absolute;
    right: 34px; top: 22px;
    width: 128px; height: 128px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(253, 230, 138, .5), rgba(253, 230, 138, 0) 68%);
    pointer-events: none;
}
.ltw-hero-head { display: flex; align-items: flex-start; gap: 18px; position: relative; z-index: 1; }
.ltw-lamp {
    width: 64px; height: 64px; flex: none;
    display: grid; place-items: center;
    border-radius: 18px;
    background: rgba(255, 255, 255, .12);
    border: 1px solid rgba(255, 255, 255, .24);
}
.ltw-lamp svg { width: 42px; height: 42px; }
.ltw-hero h1 {
    font-family: var(--ltw-serif);
    font-size: 27px; font-weight: 700; margin: 0 0 8px;
    letter-spacing: 1px; color: #fff;
}
.ltw-hero p { margin: 0; font-size: 14px; line-height: 1.8; color: rgba(255, 255, 255, .9); max-width: 780px; }
.ltw-hero p b { color: #fde68a; font-weight: 700; }
.ltw-hero-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; position: relative; z-index: 1; }
.ltw-hero-tags span {
    font-size: 12px; padding: 4px 12px; border-radius: 8px;
    background: rgba(255, 255, 255, .12);
    border: 1px solid rgba(255, 255, 255, .22);
    color: #f1f5f9;
}

/* ---------- 账本布局 ---------- */
.ltw-book { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); gap: 18px; align-items: start; }
.ltw-col { display: flex; flex-direction: column; gap: 16px; min-width: 0; }

.ltw-card {
    background: var(--neo-surface);
    border: 1px solid var(--ltw-line);
    border-radius: 16px;
    padding: 20px 22px;
    box-shadow: var(--neo-shadow);
    backdrop-filter: blur(10px);
    min-width: 0;
}
.ltw-card > h2 {
    display: flex; align-items: center; gap: 9px;
    font-family: var(--ltw-serif);
    font-size: 16px; font-weight: 700; margin: 0 0 6px;
    padding-bottom: 10px; border-bottom: 1px solid var(--ltw-line);
}
.ltw-card > h2 .sub { margin-left: auto; font-family: inherit; font-size: 11.5px; font-weight: 500; color: var(--neo-text-faint); }
.ltw-card > .lead { font-size: 12.5px; color: var(--neo-text-soft); line-height: 1.75; margin: 10px 0 0; }

/* 设备类型磁贴 */
.ltw-devs { display: grid; grid-template-columns: repeat(auto-fit, minmax(108px, 1fr)); gap: 8px; }
.ltw-dev {
    border: 1.5px solid var(--ltw-line);
    background: var(--neo-surface-solid);
    border-radius: 12px;
    padding: 10px 8px;
    cursor: pointer;
    font-family: inherit;
    text-align: center;
    transition: all .18s;
}
.ltw-dev .d1 { display: block; font-size: 20px; }
.ltw-dev .d2 { display: block; font-size: 12.5px; font-weight: 700; margin-top: 3px; color: var(--neo-text); }
.ltw-dev .d3 { display: block; font-size: 10.5px; color: var(--neo-text-faint); margin-top: 2px; }
.ltw-dev:hover { border-color: var(--neo-accent); transform: translateY(-2px); }
.ltw-dev.on {
    border-color: var(--neo-accent);
    background: var(--ltw-soft2);
    box-shadow: 0 8px 20px -12px var(--neo-accent);
}
[data-theme="dark"] .ltw-dev.on { background: rgba(165, 180, 252, .14); }

/* 结论牌 */
.ltw-verdict {
    border-radius: 16px;
    padding: 18px 20px;
    border: 1px solid var(--ltw-line);
    background: var(--ltw-soft);
}
.ltw-verdict.v-good { border-color: rgba(4, 120, 87, .38); background: var(--ltw-green-soft); }
.ltw-verdict.v-warn { border-color: rgba(180, 83, 9, .38); background: var(--ltw-amber-soft); }
.ltw-verdict.v-bad { border-color: rgba(190, 18, 60, .38); background: var(--ltw-red-soft); }
.ltw-verdict .vd-label { font-size: 12px; color: var(--neo-text-faint); letter-spacing: 2px; }
.ltw-verdict .vd-main {
    font-family: var(--ltw-serif);
    font-size: 29px; font-weight: 700; line-height: 1.3; margin: 4px 0 6px;
}
.ltw-verdict.v-good .vd-main { color: var(--ltw-green); }
.ltw-verdict.v-warn .vd-main { color: var(--ltw-amber); }
.ltw-verdict.v-bad .vd-main { color: var(--ltw-red); }
.ltw-verdict .vd-sub { font-size: 13px; line-height: 1.8; color: var(--neo-text-soft); }
.ltw-verdict .vd-sub b { color: var(--neo-text); }

/* 关键数字 */
.ltw-nums { display: grid; grid-template-columns: repeat(auto-fit, minmax(128px, 1fr)); gap: 10px; margin-top: 14px; }
.ltw-num {
    background: var(--neo-surface-solid);
    border: 1px solid var(--ltw-line);
    border-radius: 12px; padding: 12px 14px;
}
[data-theme="dark"] .ltw-num { background: rgba(255, 255, 255, .04); }
.ltw-num .k { font-size: 11.5px; color: var(--neo-text-faint); }
.ltw-num .v { font-family: var(--ltw-num); font-size: 20px; font-weight: 700; margin-top: 3px; letter-spacing: .5px; }
.ltw-num .v.good { color: var(--ltw-green); }
.ltw-num .v.warn { color: var(--ltw-amber); }
.ltw-num .v.bad { color: var(--ltw-red); }

/* 每课时成本拆解条 */
.ltw-split-bar {
    display: flex; height: 24px; border-radius: 8px; overflow: hidden;
    border: 1px solid var(--ltw-line); background: var(--ltw-soft);
}
.ltw-split-bar i { display: block; height: 100%; }
.ltw-split-bar .s-buy { background: var(--neo-accent); }
.ltw-split-bar .s-pack { background: var(--ltw-amber); }
.ltw-split-bar .s-serv { background: var(--ltw-green); }
.ltw-legend { display: flex; flex-wrap: wrap; gap: 8px 16px; margin-top: 9px; font-size: 11.5px; color: var(--neo-text-soft); }
.ltw-legend .lg { display: inline-flex; align-items: center; gap: 5px; }
.ltw-legend .lg i { width: 10px; height: 10px; border-radius: 3px; display: inline-block; }

/* 替代方案对比条 */
.ltw-bars { display: flex; flex-direction: column; gap: 11px; margin-top: 4px; }
.ltw-bar-row { display: grid; grid-template-columns: 108px 1fr 84px; gap: 10px; align-items: center; }
.ltw-bar-row .bn { font-size: 12.5px; color: var(--neo-text-soft); }
.ltw-bar-row .bt { height: 16px; border-radius: 6px; background: var(--ltw-soft2); overflow: hidden; }
.ltw-bar-row .bt i { display: block; height: 100%; border-radius: 6px; background: var(--ltw-amber); transition: width .5s cubic-bezier(.22,1,.36,1); }
.ltw-bar-row.dev .bt i { background: var(--neo-grad); }
.ltw-bar-row .bv { font-family: var(--ltw-num); font-size: 13px; font-weight: 700; text-align: right; }
.ltw-bar-row.best .bv { color: var(--ltw-green); }

/* 回本条件 */
.ltw-back {
    border: 1px dashed var(--ltw-line);
    border-radius: 12px; padding: 13px 15px;
    font-size: 13px; line-height: 1.85; color: var(--neo-text-soft);
    background: var(--ltw-soft);
}
.ltw-back b { color: var(--neo-text); font-family: var(--ltw-num); font-size: 14px; }
.ltw-back.alert { border-style: solid; border-color: rgba(190, 18, 60, .38); background: var(--ltw-red-soft); }
.ltw-back.alert b { color: var(--ltw-red); }

/* 敏感性表 */
.ltw-table-wrap { overflow-x: auto; }
.ltw-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.ltw-table th, .ltw-table td { padding: 9px 11px; text-align: left; border-bottom: 1px solid var(--ltw-line); white-space: nowrap; }
.ltw-table th { font-size: 11.5px; color: var(--neo-text-faint); font-weight: 600; }
.ltw-table td { font-variant-numeric: tabular-nums; }
.ltw-table td.hl { background: var(--ltw-soft2); font-weight: 700; }
.ltw-table .good { color: var(--ltw-green); font-weight: 700; }
.ltw-table .warn { color: var(--ltw-amber); font-weight: 700; }
.ltw-table .bad { color: var(--ltw-red); font-weight: 700; }

/* 批量对比表 */
.ltw-cmp input, .ltw-cmp select {
    width: 100%; padding: 7px 9px; font-size: 12.5px; font-family: inherit;
    color: var(--neo-text); background: var(--neo-surface-solid);
    border: 1.5px solid var(--ltw-line); border-radius: 9px; outline: none;
}
.ltw-cmp input:focus, .ltw-cmp select:focus { border-color: var(--neo-accent); }
.ltw-cmp .del {
    width: 26px; height: 26px; border: 1px solid var(--ltw-line); border-radius: 8px; cursor: pointer;
    background: var(--neo-surface-solid); color: var(--ltw-red); font-size: 13px; font-weight: 700;
}
.ltw-cmp .del:hover { background: var(--ltw-red); color: #fff; }
.ltw-cmp .cmp-best { color: var(--ltw-green); font-weight: 800; }
.ltw-cmp .cmp-label.good { color: var(--ltw-green); font-weight: 700; }
.ltw-cmp .cmp-label.warn { color: var(--ltw-amber); font-weight: 700; }
.ltw-cmp .cmp-label.bad { color: var(--ltw-red); font-weight: 700; }

/* 口径表 */
.ltw-note-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.ltw-note-table th, .ltw-note-table td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--ltw-line); vertical-align: top; line-height: 1.8; }
.ltw-note-table th { width: 118px; color: var(--neo-text); white-space: nowrap; font-weight: 700; }
.ltw-note-table td { color: var(--neo-text-soft); }
.ltw-note-table td b { color: var(--neo-text); }

.ltw-actions { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 14px; }
.ltw-actions .neo-btn { flex: 1; min-width: 106px; }

.ltw-hint { margin-top: 12px; font-size: 12.5px; line-height: 1.8; color: var(--neo-text-soft); border-left: 3px solid var(--ltw-amber); padding-left: 11px; }
.ltw-hint b { color: var(--neo-text); }

.ltw-empty { padding: 22px 14px; text-align: center; font-size: 13px; color: var(--neo-text-faint); border: 1.5px dashed var(--ltw-line); border-radius: 12px; }

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
    .ltw-book { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
    .ltw-hero { padding: 20px 16px; }
    .ltw-hero h1 { font-size: 21px; }
    .ltw-card { padding: 16px 14px; }
    .ltw-bar-row { grid-template-columns: 88px 1fr 70px; }
    .ltw-lamp { width: 50px; height: 50px; }
}

/* ---------- A4 决策单 ---------- */
.ltw-sheet { display: none; }

@media print {
    @page { margin: 14mm; }
    body * { visibility: hidden !important; }
    .ltw-sheet, .ltw-sheet * { visibility: visible !important; }
    .ltw-sheet {
        display: block !important;
        position: absolute !important;
        top: 0 !important; left: 0 !important;
        width: 100% !important; padding: 0 !important; margin: 0 !important;
        color: #000 !important; background: #fff !important; font-size: 12px; line-height: 1.7;
    }
    .ltw-sheet h1 { font-size: 20px; margin: 0 0 4px; }
    .ltw-sheet h2 { font-size: 14px; margin: 16px 0 6px; }
    .ltw-sheet .meta { font-size: 11px; color: #444; margin-bottom: 10px; }
    .ltw-sheet table { width: 100%; border-collapse: collapse; margin-bottom: 10px; }
    .ltw-sheet th, .ltw-sheet td { border: 1px solid #999; padding: 5px 8px; text-align: left; }
    .ltw-sheet th { background: #eee; }
    .ltw-sheet .foot { font-size: 10.5px; color: #555; border-top: 1px solid #999; padding-top: 8px; }
}