/* ==========================================================================
   平均数应用题练习 /tool/average-problem-drill
   视觉主题：松石暖阳 —— 松绿 + 蜜橙 + 奶油底，圆润卡片 + 条形图核心
   ========================================================================== */

.apd-page {
    --apd-cream: #fbf7ef;
    --apd-cream-2: #fffdf8;
    --apd-cream-3: #f2ead9;
    --apd-ink: #2c3a33;
    --apd-ink-2: #5a6b60;
    --apd-ink-3: #8f9c92;
    --apd-line: #ddd3bd;
    --apd-line-2: #e9e1cf;
    --apd-pine: #17786a;
    --apd-pine-2: #0e5a4e;
    --apd-pine-soft: #dff0ea;
    --apd-orange: #ef7d33;
    --apd-orange-2: #d3651d;
    --apd-orange-soft: #fdeadd;
    --apd-ok: #3d8a5f;
    --apd-ok-soft: #e2f0e6;
    --apd-err: #c04a44;
    --apd-err-soft: #f8e4e2;
    --apd-shadow: 0 14px 30px rgba(23, 120, 106, .13);
    --apd-shadow-sm: 0 4px 14px rgba(23, 120, 106, .09);
    --apd-radius: 16px;
}

:root[data-theme="dark"] .apd-page {
    --apd-cream: #202723;
    --apd-cream-2: #273029;
    --apd-cream-3: #2f3a32;
    --apd-ink: #e9efe9;
    --apd-ink-2: #aebeb2;
    --apd-ink-3: #7f8f84;
    --apd-line: #3a4a40;
    --apd-line-2: #323f37;
    --apd-pine: #5cb8a5;
    --apd-pine-2: #7ccbbc;
    --apd-pine-soft: #22352f;
    --apd-orange: #f09a5c;
    --apd-orange-2: #f5b07e;
    --apd-orange-soft: #3a2c1f;
    --apd-ok: #6cb289;
    --apd-ok-soft: #233730;
    --apd-err: #e0837b;
    --apd-err-soft: #40272a;
    --apd-shadow: 0 14px 30px rgba(0, 0, 0, .42);
    --apd-shadow-sm: 0 4px 14px rgba(0, 0, 0, .34);
}

.apd-page {
    color: var(--apd-ink);
    font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    line-height: 1.74;
    font-variant-numeric: tabular-nums;
    padding-bottom: 40px;
}

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

.apd-page h1,
.apd-page h2,
.apd-page h3 {
    font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
    font-weight: 700;
    margin: 0;
}

/* ===================== 首屏 ===================== */
.apd-hero {
    background:
        radial-gradient(circle at 14px 14px, var(--apd-cream-3) 8px, transparent 9px) 0 0 / 56px 56px,
        linear-gradient(180deg, var(--apd-cream-2), var(--apd-cream));
    border: 1px solid var(--apd-line);
    border-radius: var(--apd-radius);
    box-shadow: var(--apd-shadow);
    padding: 28px 28px 20px;
    margin-bottom: 18px;
}

.apd-hero-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 340px;
    gap: 22px;
    align-items: start;
}

.apd-kicker {
    display: inline-flex; align-items: center; gap: 6px;
    font-size: 12px; letter-spacing: 2px;
    color: var(--apd-pine-2);
    background: var(--apd-pine-soft);
    border-radius: 999px;
    padding: 4px 14px;
    margin-bottom: 10px;
    font-weight: 600;
}
.apd-kicker::before { content: "●"; color: var(--apd-orange); font-size: 9px; }

.apd-hero-copy h1 { font-size: 30px; color: var(--apd-pine-2); margin-bottom: 8px; }

.apd-lead { margin: 0 0 12px; color: var(--apd-ink-2); font-size: 14.5px; max-width: 62ch; }
.apd-lead b { color: var(--apd-pine); }

.apd-tags { list-style: none; margin: 0 0 16px; padding: 0; display: flex; flex-wrap: wrap; gap: 6px; }
.apd-tags li {
    font-size: 12px; color: var(--apd-ink-2);
    border: 1px solid var(--apd-line); background: var(--apd-cream-2);
    border-radius: 999px; padding: 2px 11px;
}

/* ---- 练习入口 ---- */
.apd-entry {
    background: var(--apd-cream-2);
    border: 1px solid var(--apd-line);
    border-radius: var(--apd-radius);
    box-shadow: var(--apd-shadow-sm);
    padding: 16px 18px 18px;
}
.apd-entry-head {
    display: flex; align-items: center; flex-wrap: wrap; gap: 8px;
    margin-bottom: 12px;
}
.apd-entry-head b { font-size: 16px; }
.apd-entry-head > span:last-child { font-size: 12.5px; color: var(--apd-ink-3); }
.apd-badge {
    font-size: 11.5px; font-weight: 700; color: #fff;
    background: var(--apd-orange); border-radius: 999px; padding: 3px 12px;
}
:root[data-theme="dark"] .apd-badge { color: #241a05; }

.apd-type-chips { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 12px; }
.apd-chip { position: relative; cursor: pointer; }
.apd-chip input { position: absolute; opacity: 0; inset: 0; }
.apd-chip span {
    display: inline-block; font-size: 13.5px; color: var(--apd-ink-2);
    border: 1.5px solid var(--apd-line); border-radius: 12px;
    padding: 6px 14px; background: var(--apd-cream);
    transition: all .15s;
}
.apd-chip input:checked + span {
    color: #fff; background: var(--apd-pine); border-color: var(--apd-pine);
    font-weight: 600;
}
:root[data-theme="dark"] .apd-chip input:checked + span { color: #10201c; }
.apd-chip input:focus-visible + span { outline: 2px solid var(--apd-orange); outline-offset: 2px; }

.apd-entry-row { display: flex; gap: 8px; margin-bottom: 12px; flex-wrap: wrap; }

.apd-select,
.apd-input {
    font: inherit; font-size: 14px; color: var(--apd-ink);
    background: var(--apd-cream); border: 1.5px solid var(--apd-line);
    border-radius: 12px; padding: 8px 12px; width: 100%;
}
.apd-select { width: auto; min-width: 180px; }
.apd-input:focus, .apd-select:focus { outline: 2px solid var(--apd-pine); border-color: var(--apd-pine); }

.apd-btn {
    font: inherit; font-size: 14px; font-weight: 600;
    border: 1.5px solid var(--apd-pine); border-radius: 12px;
    background: var(--apd-cream-2); color: var(--apd-pine);
    padding: 8px 18px; cursor: pointer; transition: all .15s;
}
.apd-btn:hover { transform: translateY(-1px); box-shadow: var(--apd-shadow-sm); }
.apd-btn--solid { background: var(--apd-pine); color: #fff; }
:root[data-theme="dark"] .apd-btn--solid { color: #10201c; }
.apd-btn--orange { background: var(--apd-orange); border-color: var(--apd-orange); color: #fff; }
:root[data-theme="dark"] .apd-btn--orange { color: #241a05; }
.apd-btn--ghost { border-color: var(--apd-line); color: var(--apd-ink-2); background: transparent; }

.apd-question {
    border: 1.5px dashed var(--apd-pine);
    background: var(--apd-pine-soft);
    border-radius: 14px; padding: 12px 14px;
}
.apd-question-meta {
    display: flex; justify-content: space-between; flex-wrap: wrap; gap: 6px;
    font-size: 12px; color: var(--apd-ink-3); margin-bottom: 6px;
}
.apd-question-meta #apdQTag {
    color: var(--apd-pine-2); font-weight: 700;
    background: var(--apd-cream-2); border-radius: 999px; padding: 1px 10px;
}
.apd-question-text { margin: 0 0 10px; font-size: 15.5px; font-weight: 600; line-height: 1.8; }
.apd-answer-row { display: flex; gap: 8px; }
.apd-answer-row .apd-input { max-width: 300px; }
.apd-answer-hint { font-size: 12px; color: var(--apd-ink-3); margin-top: 6px; }

.apd-quiz-feedback { margin-top: 10px; border-radius: 12px; padding: 9px 14px; font-size: 14px; font-weight: 600; }
.apd-quiz-feedback.apd-ok { background: var(--apd-ok-soft); color: var(--apd-ok); border: 1.5px solid var(--apd-ok); }
.apd-quiz-feedback.apd-bad { background: var(--apd-err-soft); color: var(--apd-err); border: 1.5px solid var(--apd-err); }

.apd-explain {
    margin-top: 10px; background: var(--apd-cream-2);
    border: 1.5px solid var(--apd-pine-soft); border-left: 5px solid var(--apd-pine);
    border-radius: 12px; padding: 12px 14px; font-size: 13.5px; line-height: 1.9;
}
.apd-explain h4 { margin: 0 0 6px; font-size: 13px; color: var(--apd-pine-2); }
.apd-explain ol { margin: 0; padding-left: 20px; }
.apd-explain b { color: var(--apd-pine); }

/* ---- 条形图卡 ---- */
.apd-chart {
    background: var(--apd-cream-2);
    border: 1px solid var(--apd-line);
    border-radius: var(--apd-radius);
    box-shadow: var(--apd-shadow-sm);
    overflow: hidden;
}
.apd-chart-head {
    display: flex; justify-content: space-between; align-items: baseline; gap: 6px;
    padding: 12px 16px 8px; border-bottom: 1.5px dashed var(--apd-line);
}
.apd-chart-head b { font-size: 13px; letter-spacing: 2px; color: var(--apd-pine-2); }
.apd-chart-head span { font-size: 11.5px; color: var(--apd-ink-3); }
.apd-chart-body { padding: 12px 16px 6px; }
.apd-chart-body svg { width: 100%; height: auto; display: block; }
.apd-chart-note { padding: 8px 16px 14px; font-size: 12px; color: var(--apd-ink-3); line-height: 1.7; }

/* ---- 预置 ---- */
.apd-presets { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-top: 14px; }
.apd-presets--panel { margin-top: 0; }
.apd-presets-label { font-size: 12.5px; color: var(--apd-ink-3); font-weight: 600; }
.apd-presets button {
    font: inherit; font-size: 12.5px; color: var(--apd-ink-2);
    background: var(--apd-cream-2); border: 1.5px solid var(--apd-line);
    border-radius: 999px; padding: 4px 13px; cursor: pointer; transition: all .15s;
}
.apd-presets button:hover { border-color: var(--apd-pine); color: var(--apd-pine); }

/* ===================== 校验提示 ===================== */
.apd-errbar {
    background: var(--apd-err-soft); border: 1.5px solid var(--apd-err);
    color: var(--apd-err); border-radius: 12px;
    padding: 10px 14px; font-size: 14px; font-weight: 600; margin-bottom: 16px;
}

/* ===================== 面板 ===================== */
.apd-panel {
    background: var(--apd-cream-2);
    border: 1px solid var(--apd-line);
    border-radius: var(--apd-radius);
    box-shadow: var(--apd-shadow-sm);
    padding: 20px 22px;
    margin-bottom: 18px;
}
.apd-panel-head { margin-bottom: 14px; }
.apd-panel-kicker {
    display: inline-block; font-size: 11px; letter-spacing: 3px;
    color: var(--apd-orange-2); font-weight: 700; margin-bottom: 4px;
}
.apd-panel-head h2 { font-size: 21px; margin-bottom: 6px; }
.apd-panel-head p { margin: 0; font-size: 13.5px; color: var(--apd-ink-2); max-width: 78ch; }
.apd-panel-head p b { color: var(--apd-pine); }

/* ---- 方法讲解 ---- */
.apd-method-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 12px; }
.apd-method-card {
    background: var(--apd-cream); border: 1.5px solid var(--apd-line-2);
    border-radius: 14px; padding: 14px 16px; position: relative;
}
.apd-method-no {
    display: inline-flex; align-items: center; justify-content: center;
    width: 30px; height: 30px; border-radius: 50%;
    background: var(--apd-orange); color: #fff; font-weight: 700; font-size: 15px;
    margin-bottom: 8px;
}
:root[data-theme="dark"] .apd-method-no { color: #241a05; }
.apd-method-card h3 { font-size: 15px; margin-bottom: 6px; }
.apd-method-card p { margin: 0; font-size: 13.5px; color: var(--apd-ink-2); }
.apd-method-card b { color: var(--apd-pine); }

/* ---- 战绩 ---- */
.apd-stat-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(110px, 1fr)); gap: 10px; margin-bottom: 12px; }
.apd-stat {
    background: var(--apd-cream); border: 1.5px solid var(--apd-line-2);
    border-radius: 14px; padding: 10px 14px;
    display: flex; flex-direction: column; gap: 2px;
}
.apd-stat span { font-size: 12px; color: var(--apd-ink-3); }
.apd-stat b { font-size: 22px; color: var(--apd-pine); }
.apd-stat-bar { height: 8px; background: var(--apd-cream-3); border-radius: 999px; overflow: hidden; margin-bottom: 14px; }
.apd-stat-bar-fill {
    height: 100%; border-radius: 999px;
    background: linear-gradient(90deg, var(--apd-pine), var(--apd-orange));
    transition: width .3s ease;
}

.apd-history-wrap { overflow-x: auto; }
.apd-table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
.apd-table th, .apd-table td {
    border: 1px solid var(--apd-line-2); padding: 7px 10px; text-align: left; white-space: nowrap;
}
.apd-table td.apd-wrap, .apd-table th.apd-wrap { white-space: normal; min-width: 200px; }
.apd-table th { background: var(--apd-pine-soft); color: var(--apd-pine-2); font-weight: 600; }
.apd-table .apd-empty td { text-align: center; color: var(--apd-ink-3); padding: 16px; }
.apd-mark-ok { color: var(--apd-ok); font-weight: 700; }
.apd-mark-bad { color: var(--apd-err); font-weight: 700; }

/* ---- 错题本 ---- */
.apd-batch-bar { display: flex; align-items: center; flex-wrap: wrap; gap: 8px; margin-bottom: 12px; }
.apd-batch-best { margin: 0; font-size: 13px; color: var(--apd-ink-2); }

/* ---- 导出 ---- */
.apd-pre {
    background: var(--apd-cream); border: 1.5px solid var(--apd-line-2);
    border-radius: 12px; padding: 12px 14px;
    font-family: Consolas, "Courier New", monospace; font-size: 12.5px;
    color: var(--apd-ink-2); overflow-x: auto; white-space: pre; margin: 0 0 12px;
    max-height: 220px;
}
.apd-actions { display: flex; flex-wrap: wrap; gap: 8px; }

/* ---- FAQ ---- */
.apd-faq-item {
    border: 1.5px solid var(--apd-line-2); border-radius: 14px;
    background: var(--apd-cream); margin-bottom: 10px; overflow: hidden;
}
.apd-faq-item summary {
    cursor: pointer; font-weight: 600; font-size: 14.5px;
    padding: 11px 16px; list-style: none; position: relative; padding-right: 40px;
}
.apd-faq-item summary::-webkit-details-marker { display: none; }
.apd-faq-item summary::after {
    content: "+"; position: absolute; right: 16px; top: 50%;
    transform: translateY(-50%); color: var(--apd-orange); font-weight: 700;
}
.apd-faq-item[open] summary::after { content: "−"; }
.apd-faq-a { padding: 0 16px 13px; font-size: 13.5px; color: var(--apd-ink-2); line-height: 1.9; }
.apd-faq-a b { color: var(--apd-pine); }

.apd-comments { margin-bottom: 10px; }

/* ===================== 口径说明与常见误填 ===================== */
.apd-criteria-head {
    display: flex; justify-content: space-between; align-items: baseline;
    flex-wrap: wrap; gap: 6px; margin-bottom: 12px;
}
.apd-criteria-head h2 { font-size: 18px; }
.apd-criteria-head > span { font-size: 12.5px; color: var(--apd-ink-3); }
.apd-note-table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
.apd-note-table th, .apd-note-table td {
    border-bottom: 1px solid var(--apd-line-2);
    padding: 10px 12px; text-align: left; vertical-align: top; line-height: 1.8;
}
.apd-note-table tr:last-child th, .apd-note-table tr:last-child td { border-bottom: none; }
.apd-note-table th { width: 96px; font-weight: 700; white-space: nowrap; }
.apd-note-table td { color: var(--apd-ink-2); }
.apd-note-table td b { color: var(--apd-pine); }

/* ===================== 底部信息标签页 ===================== */
.apd-tabs {
    display: flex; flex-wrap: wrap; gap: 2px;
    border-bottom: 2px solid var(--apd-line);
    margin: 22px 0 0;
}
.apd-tab {
    font: inherit; font-size: 14px; font-weight: 600;
    color: var(--apd-ink-2); background: transparent;
    border: none; border-bottom: 2px solid transparent;
    padding: 10px 16px; margin-bottom: -2px; cursor: pointer; transition: all .15s;
}
.apd-tab:hover { color: var(--apd-pine); }
.apd-tab.active { color: var(--apd-pine-2); border-bottom-color: var(--apd-orange); }
.apd-tabpane {
    display: none;
    background: var(--apd-cream-2);
    border: 1px solid var(--apd-line); border-top: none;
    border-radius: 0 0 var(--apd-radius) var(--apd-radius);
    box-shadow: var(--apd-shadow-sm);
    padding: 20px 22px;
    margin-bottom: 18px;
}
.apd-tabpane.active { display: block; }
.apd-tabpane h2 { font-size: 17px; margin: 0 0 10px; }
.apd-tabpane h2:not(:first-child) { margin-top: 18px; }
.apd-tabpane p { margin: 0 0 6px; font-size: 14px; color: var(--apd-ink-2); line-height: 2; }
.apd-tabpane p b { color: var(--apd-pine); }
.apd-tabpane ol { margin: 0; padding-left: 22px; font-size: 14px; color: var(--apd-ink-2); line-height: 2.1; }
.apd-tabpane ol b { color: var(--apd-pine); }

.apd-timeline { list-style: none; margin: 0; padding: 0; }
.apd-timeline li {
    display: flex; gap: 10px; align-items: baseline;
    padding: 10px 0; border-bottom: 1px dashed var(--apd-line-2);
    font-size: 13.5px; color: var(--apd-ink-2); line-height: 1.9;
}
.apd-timeline li:last-child { border-bottom: none; }
.apd-timeline .ver {
    flex: 0 0 auto; font-size: 11.5px; font-weight: 700;
    color: #fff; background: var(--apd-orange);
    border-radius: 999px; padding: 1px 10px;
}
:root[data-theme="dark"] .apd-timeline .ver { color: #241a05; }
.apd-timeline .date { flex: 0 0 auto; color: var(--apd-ink-3); font-size: 12.5px; }

/* ===================== 相关工具 ===================== */
.apd-related { margin-bottom: 10px; }
.apd-related h2 { font-size: 19px; margin: 0 0 12px; }
.apd-rel-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)); gap: 12px; }
.apd-rel {
    display: flex; align-items: center; gap: 10px;
    background: var(--apd-cream-2); border: 1.5px solid var(--apd-line-2);
    border-radius: 14px; padding: 12px 14px; text-decoration: none;
    transition: all .15s;
}
.apd-rel:hover { border-color: var(--apd-pine); box-shadow: var(--apd-shadow-sm); transform: translateY(-1px); }
.apd-rel .ri {
    flex: 0 0 34px; height: 34px; display: flex; align-items: center; justify-content: center;
    background: var(--apd-pine-soft); border-radius: 50%; font-size: 17px;
}
.apd-rel b { display: block; font-size: 13.5px; }
.apd-rel small { display: block; font-size: 12px; color: var(--apd-ink-3); margin-top: 2px; }

/* ===================== A4 练习卷 ===================== */
.apd-sheet { display: none; }

/* ===================== 弹窗与 toast ===================== */
.apd-overlay[hidden] { display: none; }
.apd-overlay {
    position: fixed; inset: 0; z-index: 999;
    background: rgba(28, 42, 37, .5);
    display: flex; align-items: center; justify-content: center; padding: 20px;
}
.apd-modal {
    background: var(--apd-cream-2); color: var(--apd-ink);
    border: 1px solid var(--apd-line); border-radius: 20px;
    box-shadow: var(--apd-shadow);
    max-width: 460px; width: 100%; padding: 22px 24px;
    text-align: center;
}
.apd-modal h3 { font-size: 19px; color: var(--apd-pine-2); margin-bottom: 8px; }
.apd-modal-sum { font-size: 14.5px; color: var(--apd-ink-2); line-height: 1.9; margin: 0 0 16px; text-align: left; }
.apd-modal-sum b { color: var(--apd-pine); }
.apd-modal-actions { display: flex; gap: 8px; flex-wrap: wrap; justify-content: center; }

.apd-toast {
    position: fixed; left: 50%; bottom: 34px; transform: translateX(-50%) translateY(16px);
    background: var(--apd-pine-2); color: #fff;
    font-size: 14px; font-weight: 600; padding: 10px 22px;
    border-radius: 999px; box-shadow: var(--apd-shadow);
    opacity: 0; pointer-events: none; transition: all .25s; z-index: 1000;
}
:root[data-theme="dark"] .apd-toast { background: var(--apd-orange); color: #241a05; }
.apd-toast.apd-toast--show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ===================== 响应式 ===================== */
@media (max-width: 960px) {
    .apd-hero-grid { grid-template-columns: 1fr; }
    .apd-hero { padding: 20px 16px 16px; }
    .apd-panel { padding: 16px; }
    .apd-hero-copy h1 { font-size: 25px; }
    .apd-answer-row { flex-wrap: wrap; }
    .apd-answer-row .apd-input { max-width: none; }
}

/* ===================== 打印 ===================== */
@media print {
    body * { visibility: hidden !important; }
    .apd-sheet, .apd-sheet * { visibility: visible !important; }
    .apd-sheet {
        display: block !important; position: absolute; inset: 0;
        background: #fff; color: #222; padding: 12mm; font-size: 13px;
    }
    .apd-sheet h2 { font-size: 18px; margin: 0 0 4px; }
    .apd-sheet .apd-sheet-sub { font-size: 12px; color: #555; margin-bottom: 10px; }
    .apd-sheet ol { padding-left: 22px; margin: 0; }
    .apd-sheet li { margin-bottom: 10px; line-height: 1.7; }
    .apd-sheet .apd-print-ans { color: #333; font-weight: 700; }
}