/* ============================================================
   chart-read-drill —— 「方格本统计图工坊」独立视觉系统
   米白方格纸 + 蜡笔彩色 + 墨蓝坐标轴，深色模式换石墨纸
   仅作用于 .cg 作用域；跟随站点 [data-theme="dark"]
   ============================================================ */

.cg {
    --cg-bg: #f2eee0;
    --cg-paper: #fffdf4;
    --cg-paper-2: #f8f4e6;
    --cg-grid: #e2dcc6;
    --cg-line: #ddd6c2;
    --cg-line-strong: #c3b89c;
    --cg-ink: #23303f;
    --cg-ink-soft: #55657a;
    --cg-ink-faint: #8b97a7;
    --cg-blue: #2f6fb0;
    --cg-orange: #e07a3f;
    --cg-green: #4a9463;
    --cg-purple: #7a5ea8;
    --cg-red: #cf4f4f;
    --cg-yellow: #e0ab2c;
    --cg-shadow: 0 14px 32px -20px rgba(35, 48, 63, .45);
    --cg-shadow-sm: 0 5px 14px -10px rgba(35, 48, 63, .4);
    --cg-radius: 16px;
    --cg-radius-sm: 10px;
    --cg-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    color: var(--cg-ink);
    font-family: var(--cg-sans);
    min-height: 100vh;
    padding-bottom: 10px;
    background:
        linear-gradient(rgba(255, 253, 244, .55), rgba(255, 253, 244, .55)),
        repeating-linear-gradient(0deg, var(--cg-grid) 0 1px, transparent 1px 26px),
        repeating-linear-gradient(90deg, var(--cg-grid) 0 1px, transparent 1px 26px),
        var(--cg-bg);
}

[data-theme="dark"] .cg {
    --cg-bg: #12161d;
    --cg-paper: #1b212b;
    --cg-paper-2: #212834;
    --cg-grid: #262d3a;
    --cg-line: #2c3441;
    --cg-line-strong: #3d4757;
    --cg-ink: #e9eef5;
    --cg-ink-soft: #aab6c6;
    --cg-ink-faint: #76839a;
    --cg-blue: #6ba7e0;
    --cg-orange: #f0a06a;
    --cg-green: #74c294;
    --cg-purple: #b09ae0;
    --cg-red: #ee8080;
    --cg-yellow: #f0cb63;
    --cg-shadow: 0 16px 38px -22px rgba(0, 0, 0, .85);
    --cg-shadow-sm: 0 7px 18px -12px rgba(0, 0, 0, .8);
}

/* ---------------- 面包屑 ---------------- */
.cg-crumb {
    display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
    font-size: 13px; color: var(--cg-ink-faint); margin: 0 0 14px;
}
.cg-crumb a { color: var(--cg-ink-soft); text-decoration: none; transition: color .16s; }
.cg-crumb a:hover { color: var(--cg-blue); }
.cg-crumb .sep { opacity: .55; }
.cg-crumb .cur { color: var(--cg-ink); font-weight: 600; }

/* ---------------- 首屏：练习本扉页 ---------------- */
.cg-hero {
    position: relative; overflow: hidden; border-radius: 22px; margin-bottom: 20px;
    padding: 28px 30px 26px;
    background:
        repeating-linear-gradient(90deg, transparent 0 46px, rgba(47, 111, 176, .07) 46px 47px),
        linear-gradient(160deg, #fffdf4 0%, #f7f1de 100%);
    border: 2px solid var(--cg-line-strong);
    box-shadow: var(--cg-shadow);
}
.cg-hero::after {
    content: ""; position: absolute; right: -40px; top: -60px; width: 220px; height: 220px;
    border-radius: 50%; background: radial-gradient(circle at 40% 40%, rgba(224, 122, 63, .18), transparent 70%);
    pointer-events: none;
}
.cg-hero-in { position: relative; z-index: 1; }
.cg-badge {
    display: inline-flex; align-items: center; gap: 8px; font-size: 12px; font-weight: 800;
    letter-spacing: 2px; color: var(--cg-blue);
    background: rgba(47, 111, 176, .1); border: 1.5px dashed var(--cg-blue);
    border-radius: 999px; padding: 5px 14px; margin-bottom: 13px;
}
.cg-hero h1 {
    font-size: 29px; line-height: 1.3; margin: 0 0 10px; font-weight: 800; letter-spacing: .5px;
}
.cg-hero .cg-lead { margin: 0; font-size: 14.5px; line-height: 1.85; color: var(--cg-ink-soft); max-width: 720px; }
.cg-hero .cg-lead b { color: var(--cg-blue); }
.cg-hero-tools {
    display: flex; flex-wrap: wrap; gap: 12px; align-items: flex-end; margin-top: 18px;
}
.cg-field-inline { display: flex; flex-direction: column; gap: 6px; }
.cg-field-inline > label { font-size: 12px; font-weight: 800; color: var(--cg-ink-soft); }
.cg-field-inline select, .cg-field-inline input {
    font-family: inherit; font-size: 13.5px; color: var(--cg-ink); background: var(--cg-paper);
    border: 1.5px solid var(--cg-line-strong); border-radius: 8px; padding: 7px 10px; outline: none; min-width: 116px;
}
.cg-field-inline select:focus, .cg-field-inline input:focus { border-color: var(--cg-blue); box-shadow: 0 0 0 3px rgba(47, 111, 176, .16); }
.cg-type-chips { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 14px; }
.cg-chip {
    font-size: 12.5px; font-weight: 700; cursor: pointer; font-family: inherit;
    padding: 6px 13px; border-radius: 999px;
    background: var(--cg-paper); border: 1.5px solid var(--cg-line-strong); color: var(--cg-ink-soft);
    transition: all .16s;
}
.cg-chip:hover { border-color: var(--cg-blue); color: var(--cg-blue); }
.cg-chip.on { background: var(--cg-blue); border-color: var(--cg-blue); color: #fff; }

.cg-progress {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 12px; margin-top: 18px;
}
.cg-pbox {
    background: var(--cg-paper); border: 1.5px solid var(--cg-line); border-radius: 12px;
    padding: 11px 14px; box-shadow: var(--cg-shadow-sm); color: var(--cg-ink);
}
.cg-pbox .k { font-size: 12px; color: var(--cg-ink-faint); display: block; }
.cg-pbox .v { font-size: 20px; font-weight: 800; display: block; margin-top: 3px; }
.cg-pbox .v.ok { color: var(--cg-green); }
.cg-pbox .v.bad { color: var(--cg-red); }
.cg-pbar { display: block; height: 6px; border-radius: 4px; background: var(--cg-paper-2); border: 1px solid var(--cg-line); margin-top: 9px; overflow: hidden; }
.cg-pbar i { display: block; height: 100%; background: var(--cg-green); transition: width .35s; }

/* ---------------- 按钮 ---------------- */
.cg-btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 6px;
    font-family: inherit; font-size: 13.5px; font-weight: 800; cursor: pointer;
    padding: 10px 18px; border-radius: var(--cg-radius-sm);
    border: 1.5px solid var(--cg-blue); background: var(--cg-blue); color: #fff;
    transition: transform .16s, box-shadow .16s, background .16s, color .16s; white-space: nowrap;
}
.cg-btn:hover { transform: translateY(-2px); box-shadow: 0 12px 22px -12px var(--cg-blue); }
.cg-btn:active { transform: translateY(0); }
.cg-btn--ghost { background: var(--cg-paper); color: var(--cg-ink); border-color: var(--cg-line-strong); }
.cg-btn--ghost:hover { border-color: var(--cg-blue); color: var(--cg-blue); box-shadow: none; }
.cg-btn--orange { background: var(--cg-orange); border-color: var(--cg-orange); }
.cg-btn--orange:hover { box-shadow: 0 12px 22px -12px var(--cg-orange); }
.cg-btn--green { background: var(--cg-green); border-color: var(--cg-green); }
.cg-btn--green:hover { box-shadow: 0 12px 22px -12px var(--cg-green); }
.cg-btn--red { background: var(--cg-red); border-color: var(--cg-red); }
.cg-btn--sm { padding: 7px 13px; font-size: 12.5px; border-radius: 8px; }
.cg-btn--wide { width: 100%; }
.cg-btn[disabled] { opacity: .45; cursor: not-allowed; transform: none; }

/* ---------------- 布局 ---------------- */
.cg-wrap { max-width: 1240px; margin: 0 auto; padding: 22px 20px 40px; }
.cg-card {
    background: var(--cg-paper); border: 1.5px solid var(--cg-line);
    border-radius: var(--cg-radius); padding: 20px 22px; box-shadow: var(--cg-shadow);
}
.cg-card-head { display: flex; align-items: flex-start; gap: 10px; margin-bottom: 15px; flex-wrap: wrap; }
.cg-card-head .ic {
    width: 32px; height: 32px; flex: none; border-radius: 9px; display: grid; place-items: center;
    font-size: 17px; background: rgba(47, 111, 176, .12); color: var(--cg-blue);
}
.cg-card-head h2 { font-size: 16.5px; margin: 2px 0 0; font-weight: 800; }
.cg-card-head .sub { font-size: 12px; color: var(--cg-ink-faint); margin: 4px 0 0; }
.cg-card-head .right { margin-left: auto; display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.cg-grid { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr); gap: 18px; align-items: start; }
.cg-col { display: flex; flex-direction: column; gap: 18px; min-width: 0; }

/* ---------------- 练习区 ---------------- */
.cg-qbar {
    display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
    padding: 11px 14px; border-radius: 12px; background: var(--cg-paper-2);
    border: 1.5px dashed var(--cg-line-strong); margin-bottom: 16px;
}
.cg-qbar .no { font-weight: 800; font-size: 14px; color: var(--cg-blue); }
.cg-qbar .sp { flex: 1; }
.cg-qtype {
    font-size: 11.5px; font-weight: 800; color: var(--cg-orange);
    background: rgba(224, 122, 63, .12); border-radius: 999px; padding: 3px 10px;
}
.cg-qbody { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); gap: 18px; align-items: start; }
.cg-chart-box {
    background: var(--cg-paper); border: 1.5px solid var(--cg-line-strong); border-radius: 12px;
    padding: 12px; overflow-x: auto;
}
.cg-chart-box svg { display: block; width: 100%; height: auto; min-width: 380px; }
.cg-axis { stroke: var(--cg-ink); stroke-width: 1.6; }
.cg-gridline { stroke: var(--cg-line); stroke-width: 1; stroke-dasharray: 4 4; }
.cg-lab { font-size: 12px; fill: var(--cg-ink-soft); font-family: var(--cg-sans); }
.cg-lab-strong { font-size: 12.5px; fill: var(--cg-ink); font-weight: 700; font-family: var(--cg-sans); }
.cg-val { font-size: 12px; font-weight: 700; font-family: var(--cg-sans); }
.cg-title { font-size: 14px; font-weight: 800; fill: var(--cg-ink); font-family: var(--cg-sans); }
.cg-legend { font-size: 11.5px; fill: var(--cg-ink-faint); font-family: var(--cg-sans); }

.cg-question {
    background: var(--cg-paper-2); border: 1.5px solid var(--cg-line); border-radius: 12px;
    padding: 15px 16px;
}
.cg-question .qt { font-size: 15px; font-weight: 800; line-height: 1.75; margin: 0 0 12px; }
.cg-question .qt .blank {
    display: inline-block; min-width: 62px; border-bottom: 2px solid var(--cg-blue);
    text-align: center; color: var(--cg-blue);
}
.cg-choices { display: flex; flex-direction: column; gap: 8px; margin-bottom: 13px; }
.cg-choice {
    display: flex; align-items: center; gap: 9px; cursor: pointer; font-size: 13.5px;
    padding: 9px 12px; border-radius: 9px; border: 1.5px solid var(--cg-line);
    background: var(--cg-paper); transition: all .14s;
}
.cg-choice:hover { border-color: var(--cg-blue); }
.cg-choice input { accent-color: var(--cg-blue); width: 16px; height: 16px; }
.cg-choice.picked { border-color: var(--cg-blue); background: rgba(47, 111, 176, .08); }
.cg-numin {
    width: 100%; box-sizing: border-box; font-family: inherit; font-size: 16px; font-weight: 700;
    color: var(--cg-blue); background: var(--cg-paper); border: 1.5px solid var(--cg-line-strong);
    border-radius: 9px; padding: 10px 12px; outline: none; text-align: center;
}
.cg-numin:focus { border-color: var(--cg-blue); box-shadow: 0 0 0 3px rgba(47, 111, 176, .16); }
.cg-unit { font-size: 12.5px; color: var(--cg-ink-faint); margin: 6px 0 0; text-align: center; }
.cg-judge {
    margin-top: 13px; border-radius: 10px; padding: 11px 13px; font-size: 13px; line-height: 1.8;
    display: none;
}
.cg-judge.show { display: block; }
.cg-judge.right { background: rgba(74, 148, 99, .14); border: 1px solid rgba(74, 148, 99, .4); }
.cg-judge.wrong { background: rgba(207, 79, 79, .13); border: 1px solid rgba(207, 79, 79, .38); }
.cg-judge b { color: var(--cg-ink); }
.cg-qfoot { display: flex; gap: 9px; flex-wrap: wrap; margin-top: 14px; }

/* ---------------- 制图练习 ---------------- */
.cg-draw-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 11px; }
.cg-draw-item { display: flex; flex-direction: column; gap: 5px; }
.cg-draw-item label { font-size: 12px; font-weight: 700; color: var(--cg-ink-soft); }
.cg-draw-item input {
    font-family: inherit; font-size: 14px; color: var(--cg-ink); background: var(--cg-paper-2);
    border: 1.5px solid var(--cg-line); border-radius: 8px; padding: 8px 10px; outline: none; width: 100%;
    box-sizing: border-box;
}
.cg-draw-item input:focus { border-color: var(--cg-orange); box-shadow: 0 0 0 3px rgba(224, 122, 63, .16); }
.cg-draw-err { font-size: 12.5px; color: var(--cg-red); margin: 10px 0 0; }
.cg-draw-err:empty { display: none; }

/* ---------------- 错题本 ---------------- */
.cg-wrong-list { display: flex; flex-direction: column; gap: 9px; }
.cg-wrong {
    display: flex; gap: 11px; align-items: flex-start; padding: 11px 13px;
    border-radius: 10px; border: 1px solid var(--cg-line); background: var(--cg-paper-2);
}
.cg-wrong .no {
    flex: none; width: 24px; height: 24px; border-radius: 50%; background: var(--cg-red);
    color: #fff; font-size: 12px; font-weight: 800; display: grid; place-items: center;
}
.cg-wrong .txt { font-size: 13px; line-height: 1.75; color: var(--cg-ink-soft); }
.cg-wrong .txt b { color: var(--cg-ink); }
.cg-empty { padding: 20px 10px; text-align: center; color: var(--cg-ink-faint); font-size: 13px; }

/* ---------------- 说明 ---------------- */
.cg-note {
    display: flex; gap: 9px; align-items: flex-start; border-radius: var(--cg-radius-sm);
    padding: 11px 14px; font-size: 12.5px; line-height: 1.75;
    background: rgba(224, 171, 44, .13); border: 1px solid rgba(224, 171, 44, .42);
}
.cg-note .ic { flex: none; font-size: 15px; }
.cg-note b { color: var(--cg-orange); }
.cg-hint { font-size: 12px; color: var(--cg-ink-faint); margin: 8px 0 0; line-height: 1.7; }

.cg-notes { width: 100%; border-collapse: collapse; font-size: 13px; }
.cg-notes th, .cg-notes td { padding: 11px 12px; border-bottom: 1px solid var(--cg-line); text-align: left; vertical-align: top; line-height: 1.8; }
.cg-notes th { width: 112px; white-space: nowrap; font-weight: 800; color: var(--cg-blue); background: var(--cg-paper-2); font-size: 12.5px; }
.cg-notes td { color: var(--cg-ink-soft); }
.cg-notes td b { color: var(--cg-ink); }
.cg-notes tr:last-child th, .cg-notes tr:last-child td { border-bottom: 0; }

.cg-tabs { display: flex; gap: 4px; flex-wrap: wrap; margin: 26px 0 0; border-bottom: 2px solid var(--cg-line); }
.cg-tab {
    border: 0; background: none; cursor: pointer; font-family: inherit;
    font-size: 14px; font-weight: 800; color: var(--cg-ink-faint); padding: 10px 16px; position: relative;
    transition: color .16s;
}
.cg-tab:hover { color: var(--cg-ink); }
.cg-tab.active { color: var(--cg-blue); }
.cg-tab.active::after {
    content: ""; position: absolute; left: 12px; right: 12px; bottom: -2px; height: 3px;
    background: var(--cg-blue); border-radius: 3px 3px 0 0;
}
.cg-panel {
    display: none; background: var(--cg-paper); border: 1.5px solid var(--cg-line); border-top: 0;
    border-radius: 0 0 var(--cg-radius) var(--cg-radius); padding: 22px 24px; box-shadow: var(--cg-shadow);
}
.cg-panel.active { display: block; animation: cg-fade .28s ease; }
@keyframes cg-fade { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }
.cg-panel h3 { font-size: 17px; margin: 0 0 12px; }
.cg-panel h3:not(:first-child) { margin-top: 24px; }
.cg-panel p, .cg-panel li { font-size: 13.5px; line-height: 1.95; color: var(--cg-ink-soft); margin: 0 0 10px; }
.cg-panel ol, .cg-panel ul { margin: 0; padding-left: 22px; }
.cg-panel b { color: var(--cg-ink); }
.cg-faq details { border: 1.5px solid var(--cg-line); border-radius: 10px; padding: 0 15px; margin-bottom: 9px; background: var(--cg-paper-2); }
.cg-faq summary { cursor: pointer; font-size: 13.5px; font-weight: 800; padding: 12px 0; list-style: none; }
.cg-faq summary::-webkit-details-marker { display: none; }
.cg-faq summary::after { content: "＋"; float: right; color: var(--cg-blue); font-weight: 700; }
.cg-faq details[open] summary::after { content: "－"; }
.cg-faq .a { padding: 0 0 13px; font-size: 13px; line-height: 1.9; color: var(--cg-ink-soft); }
.cg-timeline { list-style: none; padding: 0; margin: 0; }
.cg-timeline li { display: flex; gap: 12px; align-items: baseline; margin-bottom: 11px; }
.cg-timeline .ver { font-weight: 800; color: var(--cg-blue); flex: none; }
.cg-timeline .date { font-size: 12.5px; color: var(--cg-ink-faint); flex: none; width: 88px; }
.cg-timeline .txt { font-size: 13px; color: var(--cg-ink-soft); line-height: 1.8; }

.cg-rel { margin-top: 24px; }
.cg-rel h3 { font-size: 18px; margin: 0 0 13px; }
.cg-rel-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(215px, 1fr)); gap: 11px; }
.cg-rel-item {
    display: flex; align-items: center; gap: 11px; padding: 13px 15px; text-decoration: none;
    background: var(--cg-paper); border: 1.5px solid var(--cg-line); border-radius: 12px;
    color: var(--cg-ink); box-shadow: var(--cg-shadow-sm); transition: transform .16s, border-color .16s;
}
.cg-rel-item:hover { transform: translateY(-3px); border-color: var(--cg-blue); }
.cg-rel-item .ri { font-size: 21px; flex: none; }
.cg-rel-item b { display: block; font-size: 13.5px; }
.cg-rel-item small { font-size: 11.5px; color: var(--cg-ink-faint); }

/* ---------------- toast ---------------- */
.cg-toast {
    position: fixed; left: 50%; bottom: 34px; transform: translateX(-50%) translateY(16px);
    background: rgba(35, 48, 63, .94); color: #fff; font-size: 13.5px;
    padding: 11px 20px; border-radius: 999px; opacity: 0; pointer-events: none;
    transition: all .26s; z-index: 9999; box-shadow: 0 14px 32px rgba(0, 0, 0, .3);
}
.cg-toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ---------------- 统计表 ---------------- */
.cg-dtable { width: 100%; border-collapse: collapse; font-size: 13.5px; min-width: 360px; }
.cg-dtable caption { font-size: 14px; font-weight: 800; text-align: left; padding: 4px 0 10px; color: var(--cg-ink); }
.cg-dtable th, .cg-dtable td { border: 1px solid var(--cg-line-strong); padding: 9px 10px; text-align: center; }
.cg-dtable thead th { background: var(--cg-paper-2); color: var(--cg-ink); font-weight: 800; }
.cg-dtable tbody th { background: var(--cg-paper-2); text-align: left; color: var(--cg-ink-soft); font-weight: 700; }
.cg-dtable tbody td { font-weight: 700; color: var(--cg-blue); font-size: 15px; }

/* ---------------- 打印卷 ---------------- */
.cg-sheet {
    display: none;
    --cg-paper: #fffdf4; --cg-paper-2: #f8f4e6; --cg-line: #ddd6c2; --cg-line-strong: #c3b89c;
    --cg-ink: #23303f; --cg-ink-soft: #55657a; --cg-ink-faint: #8b97a7;
    --cg-blue: #2f6fb0; --cg-orange: #e07a3f; --cg-green: #4a9463;
    --cg-purple: #7a5ea8; --cg-red: #cf4f4f; --cg-yellow: #e0ab2c;
}
.cg-sheet-inner { padding: 6mm; color: #000; font-family: var(--cg-sans); }
.cg-sheet h2 { font-size: 19px; margin: 0 0 4px; text-align: center; }
.cg-sheet .sub { text-align: center; font-size: 12px; color: #555; margin-bottom: 12px; }
.cg-sheet .qitem { margin-bottom: 14px; break-inside: avoid; }
.cg-sheet .qitem .qt { font-size: 13px; line-height: 1.8; margin: 0 0 6px; }
.cg-sheet .qitem .ans { font-size: 12px; color: #333; border-top: 1px dashed #999; padding-top: 4px; }
.cg-sheet .qitem svg { max-width: 420px; width: 100%; height: auto; border: 1px solid #ddd; }
.cg-sheet .foot { font-size: 11px; color: #555; line-height: 1.7; margin-top: 10px; }

/* ---------------- 响应式 ---------------- */
@media (max-width: 980px) {
    .cg-grid, .cg-qbody { grid-template-columns: 1fr; }
    .cg-hero { padding: 24px 20px 22px; }
    .cg-hero h1 { font-size: 24px; }
    .cg-wrap { padding: 18px 14px 34px; }
}
@media (max-width: 560px) {
    .cg-card { padding: 16px 14px; }
    .cg-progress { grid-template-columns: 1fr 1fr; }
    .cg-panel { padding: 18px 16px; }
    .cg-notes th { width: auto; }
    .cg-notes tr { display: block; border-bottom: 1px solid var(--cg-line); }
    .cg-notes th, .cg-notes td { display: block; border-bottom: 0; }
}

/* ---------------- 打印 ---------------- */
@media print {
    body { background: #fff !important; }
    .cg { display: none !important; }
    .nav-header, .footer, .back-to-top, #clicaptcha-container,
    #evadeFab, .evade-fab, #navEvadeBtn, .nav-evade-btn, #navMask, .nav-mask,
    .ma-page-modal, .ma-toast-wrap, .gh-modal, .site-btt, .cg-toast { display: none !important; }
    .cg-sheet { display: block !important; }
    body.cg-print-ans .cg-sheet--paper { display: none !important; }
    body.cg-print-paper .cg-sheet--ans { display: none !important; }
    .cg-sheet-inner { padding: 0; }
    @page { size: A4; margin: 12mm; }
}