/* ============================================================
   829 数据工程基础 · 闯关刷题系统 样式表
   主题：深空神经网络 + 霓虹发光
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --bg: #070b17;
    --bg-2: #0c1428;
    --panel: rgba(17, 26, 48, 0.92);
    --line: rgba(120, 170, 255, 0.16);
    --txt: #dce9ff;
    --txt-dim: #8aa0c4;
    --cyan: #38bdf8;
    --purple: #a78bfa;
    --green: #34d399;
    --amber: #f59e0b;
    --rose: #fb7185;
    --gold: #c084fc;
}

html, body { height: 100%; }

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    background:
        radial-gradient(1200px 600px at 15% -10%, rgba(56, 189, 248, 0.14), transparent 60%),
        radial-gradient(900px 500px at 90% 10%, rgba(167, 139, 250, 0.13), transparent 60%),
        var(--bg);
    color: var(--txt);
    font-size: 15px;
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
}
body.no-scroll { overflow: hidden; }
button { font-family: inherit; cursor: pointer; }
ul { list-style: none; }

/* ================= HUD ================= */
.hud {
    position: sticky; top: 0; z-index: 60;
    display: flex; align-items: center; gap: 20px;
    padding: 12px 22px;
    background: linear-gradient(180deg, rgba(9, 14, 28, 0.96), rgba(9, 14, 28, 0.82));
    border-bottom: 1px solid var(--line);
    backdrop-filter: blur(12px);
    flex-wrap: wrap;
}
.hud-left { display: flex; align-items: center; gap: 14px; min-width: 280px; }
.avatar {
    width: 58px; height: 58px; border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-weight: 800; font-size: 14px; color: #fff;
    background:
        conic-gradient(var(--gold) 0deg var(--p, 0deg), rgba(255,255,255,0.08) var(--p, 0deg) 360deg);
    box-shadow: 0 0 18px rgba(168, 85, 247, 0.3);
    position: relative; flex: 0 0 auto;
}
.avatar::after {
    content: ''; position: absolute; inset: 4px; border-radius: 50%;
    background: radial-gradient(circle at 35% 25%, #1b2b4d, #0a1122);
    border: 1px solid rgba(255,255,255,0.1);
}
.avatar span { position: relative; z-index: 1; }
.hud-xp { flex: 1 1 180px; min-width: 160px; }
.hud-xp-top { display: flex; justify-content: space-between; font-size: 12px; color: var(--txt-dim); }
.hud-xp-top b { color: var(--gold); font-variant-numeric: tabular-nums; }
.xp-bar {
    height: 9px; margin-top: 5px; border-radius: 99px; overflow: hidden;
    background: rgba(255,255,255,0.08); box-shadow: inset 0 0 6px rgba(0,0,0,0.5);
}
.xp-fill {
    height: 100%; width: 0%;
    background: linear-gradient(90deg, #7c3aed, #a855f7, #ddd6fe);
    box-shadow: 0 0 12px rgba(168, 85, 247, 0.6);
    transition: width 0.45s cubic-bezier(.2,.8,.2,1);
}
.hud-stats { display: flex; gap: 18px; flex-wrap: wrap; }
.hud-stats .stat { display: flex; flex-direction: column; align-items: center; min-width: 72px; }
.hud-stats .stat span { font-size: 11px; color: var(--txt-dim); }
.hud-stats .stat b { font-size: 17px; font-variant-numeric: tabular-nums; }
.hud-stats .stat.warn b { color: var(--rose); }
.hud-right { display: flex; gap: 8px; margin-left: auto; }

.btn {
    border: 1px solid var(--line);
    background: rgba(255,255,255,0.05);
    color: var(--txt); border-radius: 10px;
    padding: 9px 16px; font-size: 13px; font-weight: 600;
    transition: all 0.18s;
}
.btn:hover { background: rgba(255,255,255,0.12); transform: translateY(-1px); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }
.btn-primary {
    background: linear-gradient(135deg, #2563eb, #38bdf8);
    border-color: transparent; color: #04101f;
    box-shadow: 0 6px 18px rgba(56, 189, 248, 0.28);
}
.btn-primary:hover { background: linear-gradient(135deg, #3b82f6, #7dd3fc); }
.btn-ghost { background: rgba(255,255,255,0.04); }
.btn-ghost.danger:hover { background: rgba(251, 113, 133, 0.18); border-color: rgba(251,113,133,0.5); }
.btn-ok { background: linear-gradient(135deg, #059669, #34d399); border-color: transparent; color: #04140d; }
.btn-no { background: linear-gradient(135deg, #9f1239, #fb7185); border-color: transparent; color: #fff; }
.btn-mini { padding: 5px 11px; font-size: 12px; border-radius: 8px; }
.btn-block { width: 100%; margin-top: 14px; padding: 13px; font-size: 15px; }

/* ================= 图例 ================= */
.legend {
    display: flex; gap: 26px; flex-wrap: wrap;
    padding: 10px 22px; font-size: 12px; color: var(--txt-dim);
    border-bottom: 1px solid rgba(120,170,255,0.08);
}
.legend-group { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.legend-title { color: #6f86a8; font-weight: 700; }
.lg-item { display: inline-flex; align-items: center; gap: 5px; }
.lg-item i { width: 10px; height: 10px; border-radius: 3px; display: inline-block; }
.lg-item i.dot { border-radius: 50%; }
.lg-item i.locked { background: #33405c; }
.lg-item i.unlocked { background: var(--cyan); box-shadow: 0 0 8px var(--cyan); }
.lg-item i.cleared { background: var(--green); box-shadow: 0 0 8px var(--green); }
.lg-item i.boss { background: var(--rose); box-shadow: 0 0 8px var(--rose); }
/* 考点掌握度图例：与热力图、地图外圈用同一套配色 */
.lg-item i.m0 { background: #33405c; }
.lg-item i.m1 { background: var(--rose); box-shadow: 0 0 8px var(--rose); }
.lg-item i.m2 { background: var(--amber); box-shadow: 0 0 8px var(--amber); }
.lg-item i.m3 { background: var(--green); box-shadow: 0 0 8px var(--green); }
.legend-group.hint { margin-left: auto; }

/* ================= 地图 ================= */
.map-scroll { overflow: auto; padding: 8px 0 40px; }
.map-inner { position: relative; margin: 0 auto; min-width: 1160px; }

.map-bg {
    position: absolute; inset: 0;
    background-image:
        linear-gradient(rgba(120, 170, 255, 0.045) 1px, transparent 1px),
        linear-gradient(90deg, rgba(120, 170, 255, 0.045) 1px, transparent 1px);
    background-size: 44px 44px;
    pointer-events: none;
}
.tier-col {
    position: absolute; top: 0; bottom: 0;
    border-left: 1px dashed rgba(120, 170, 255, 0.12);
    border-right: 1px dashed rgba(120, 170, 255, 0.06);
    background: linear-gradient(180deg, color-mix(in srgb, var(--tc) 9%, transparent), transparent 55%);
    border-radius: 18px;
}
.tier-title {
    position: absolute; top: 18px; left: 0; right: 0; text-align: center;
    font-size: 15px; font-weight: 800; letter-spacing: 3px; color: var(--tc);
    text-shadow: 0 0 16px color-mix(in srgb, var(--tc) 60%, transparent);
}
.tier-desc {
    position: absolute; top: 46px; left: 22px; right: 22px; text-align: center;
    font-size: 11.5px; color: var(--txt-dim); line-height: 1.5;
}

/* ---------- 章分组带：把 69 个球按教材章切成一目了然的段 ---------- */
.chap-band {
    position: absolute; pointer-events: none;
    border-top: 1px dashed color-mix(in srgb, var(--tc) 30%, transparent);
    border-radius: 14px;
    background: linear-gradient(180deg, color-mix(in srgb, var(--tc) 6%, transparent), transparent 46%);
}
.chap-tag {
    position: absolute; top: 8px; left: 12px; white-space: nowrap;
    padding: 1px 9px; border-radius: 99px;
    font-size: 11px; font-weight: 700; letter-spacing: 0.5px;
    color: var(--tc);
    background: rgba(7, 11, 23, 0.88);
    border: 1px solid color-mix(in srgb, var(--tc) 30%, transparent);
}

.edges { position: absolute; inset: 0; pointer-events: none; overflow: visible; }
.edge { fill: none; stroke-width: 1.6; opacity: 0.32; }
.edge-locked { stroke-dasharray: 5 7; opacity: 0.16; }
.edge-done { opacity: 0.45; stroke-width: 2.2; }
.edge-active {
    opacity: 0.9; stroke-width: 2.6;
    stroke-dasharray: 9 9;
    animation: flow 1s linear infinite;
    filter: drop-shadow(0 0 6px currentColor);
}
@keyframes flow { to { stroke-dashoffset: -36; } }

/* ---------- 节点 ---------- */
.nodes { position: absolute; inset: 0; }
.node {
    position: absolute; transform: translate(-50%, -50%);
    width: 112px;
    text-align: center; cursor: pointer; user-select: none;
    transition: transform 0.18s;
}
.node:hover { transform: translate(-50%, -50%) scale(1.07); z-index: 5; }
.node-core {
    position: relative; margin: 0 auto;
    width: var(--size); height: var(--size); border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    background: radial-gradient(circle at 34% 28%, color-mix(in srgb, var(--color) 55%, #0b1220), #0a1122 72%);
    border: 2px solid color-mix(in srgb, var(--color) 70%, transparent);
    box-shadow: 0 0 20px color-mix(in srgb, var(--color) 35%, transparent), inset 0 0 18px rgba(0,0,0,0.6);
}
.node-icon { font-size: calc(var(--size) * 0.42); line-height: 1; filter: drop-shadow(0 0 6px rgba(0,0,0,0.6)); }
.node-crown {
    position: absolute; right: -6px; top: -6px;
    width: 24px; height: 24px; border-radius: 50%;
    background: linear-gradient(135deg, #059669, #34d399);
    color: #052e21; font-size: 13px; font-weight: 900; line-height: 24px;
    box-shadow: 0 0 12px rgba(52, 211, 153, 0.7);
}
.node-ring {
    position: absolute; inset: -9px; border-radius: 50%;
    border: 1px solid color-mix(in srgb, var(--color) 35%, transparent);
    opacity: 0; transition: opacity 0.25s;
}
.node.unlocked .node-ring { opacity: 1; animation: pulse 2.6s ease-in-out infinite; }
@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 0.55; }
    50% { transform: scale(1.08); opacity: 1; }
}
.node-label {
    margin-top: 7px; font-size: 12px; font-weight: 700; color: var(--txt);
    text-shadow: 0 2px 8px #000;
    /* 名字必须单行省略：换行会让节点纵向变高，69 个节点交错时就会压到相邻节点的球 */
    white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
/* 占比与掌握度并排一行，省掉一整行高度（原来两行会让节点栈高出 20px） */
.node-foot {
    display: flex; align-items: center; justify-content: center; gap: 5px;
    margin-top: 3px;
}
.node-meta { font-size: 10px; color: var(--txt-dim); white-space: nowrap; }

/* ---- 地图节点上的掌握度 ---- */
.node-mast {
    display: inline-block; padding: 1px 6px;
    font-size: 10px; font-weight: 700; border-radius: 999px;
    font-variant-numeric: tabular-nums; white-space: nowrap;
}
.node-mast.m0 { color: #7b8aa8; background: rgba(255, 255, 255, 0.05); }
.node-mast.m1 { color: #ffd3da; background: rgba(251, 113, 133, 0.22); border: 1px solid rgba(251, 113, 133, 0.5); }
.node-mast.m2 { color: #ffe8bd; background: rgba(245, 158, 11, 0.22); border: 1px solid rgba(245, 158, 11, 0.5); }
.node-mast.m3 { color: #c9f8e5; background: rgba(52, 211, 153, 0.22); border: 1px solid rgba(52, 211, 153, 0.55); }
/* 题库建设中的考点：灰色虚线 + 标签写「建设中」，一眼区别于「未解锁」 */
.node.wip .node-core { filter: grayscale(0.9); opacity: 0.4; border-style: dashed; box-shadow: none; }
.node.wip .node-label { color: #6b7a96; }
.node.wip .node-meta { opacity: 0.5; }
.node.wip .node-ring { opacity: 0 !important; animation: none !important; }
.node-mast.wip { color: #8b98b0; background: rgba(255, 255, 255, 0.05); border: 1px dashed rgba(255, 255, 255, 0.22); }
/* 外圈颜色跟着掌握度走：红=薄弱 黄=一般 绿=扎实 */
.node.m1 .node-ring { border-color: rgba(251, 113, 133, 0.9); border-width: 2px; }
.node.m2 .node-ring { border-color: rgba(245, 158, 11, 0.9); border-width: 2px; }
.node.m3 .node-ring { border-color: rgba(52, 211, 153, 0.95); border-width: 2px; }

.node.locked { cursor: not-allowed; }
.node.locked .node-core {
    filter: grayscale(1); opacity: 0.5;
    border-color: rgba(140,160,190,0.28);
    box-shadow: none;
}
.node.locked .node-label { color: #66799a; }
.node.cleared .node-core {
    border-color: var(--green);
    box-shadow: 0 0 22px rgba(52, 211, 153, 0.45), inset 0 0 18px rgba(0,0,0,0.5);
}
.node.boss .node-core { animation: bossGlow 2.2s ease-in-out infinite; }
@keyframes bossGlow {
    0%, 100% { box-shadow: 0 0 22px rgba(251, 113, 133, 0.4), inset 0 0 18px rgba(0,0,0,0.6); }
    50% { box-shadow: 0 0 38px rgba(251, 113, 133, 0.8), inset 0 0 18px rgba(0,0,0,0.6); }
}

/* ================= 悬浮提示 ================= */
.tip {
    position: fixed; z-index: 200; max-width: 300px;
    padding: 11px 14px; border-radius: 12px; font-size: 12.5px;
    background: rgba(12, 20, 40, 0.97);
    border: 1px solid rgba(120,170,255,0.28);
    box-shadow: 0 12px 34px rgba(0,0,0,0.6);
    opacity: 0; pointer-events: none; transform: translateY(6px);
    transition: opacity 0.15s, transform 0.15s;
}
.tip.show { opacity: 1; transform: translateY(0); }
.tip-title { font-weight: 800; margin-bottom: 5px; font-size: 13.5px; }
.tip-row { color: var(--txt-dim); }
.tip-row b { color: var(--txt); }
.tip-row .ok { color: var(--green); }
.tip-row .no { color: var(--rose); }
.tip-chap { color: var(--purple); font-size: 12px; }

/* ================= 关卡简报弹窗 ================= */
.modal-mask {
    position: fixed; inset: 0; z-index: 150;
    display: none; align-items: center; justify-content: center;
    background: rgba(4, 8, 18, 0.78); backdrop-filter: blur(6px);
    padding: 20px;
}
.modal-mask.show { display: flex; }
.modal-wrap { position: relative; width: 100%; max-width: 560px; max-height: 88vh; }
.modal-close {
    position: absolute; right: -6px; top: -6px; z-index: 3;
    width: 34px; height: 34px; border-radius: 50%;
    background: rgba(20,30,55,0.95); border: 1px solid var(--line);
    color: var(--txt); font-size: 15px;
}
.modal-card {
    background: var(--panel); border: 1px solid rgba(120,170,255,0.22);
    border-radius: 18px; padding: 24px; overflow-y: auto; max-height: 88vh;
    box-shadow: 0 30px 70px rgba(0,0,0,0.6);
    animation: pop 0.22s ease-out;
}
@keyframes pop { from { transform: scale(0.94); opacity: 0; } to { transform: scale(1); opacity: 1; } }
.nd-head { display: flex; gap: 14px; align-items: center; }
.nd-icon {
    width: 54px; height: 54px; border-radius: 16px; flex: 0 0 auto;
    display: flex; align-items: center; justify-content: center; font-size: 26px;
    background: color-mix(in srgb, var(--color) 18%, transparent);
    border: 1px solid color-mix(in srgb, var(--color) 50%, transparent);
}
.nd-name { font-size: 19px; font-weight: 800; }
.nd-sub { font-size: 12px; color: var(--txt-dim); }
.nd-desc { margin-top: 14px; color: #b9cbe8; font-size: 13.5px; }
.nd-block { margin-top: 16px; }
.nd-block-title { font-size: 13px; font-weight: 800; color: var(--cyan); margin-bottom: 7px; }
.nd-block ul li {
    font-size: 13px; color: #b9cbe8; padding-left: 16px; position: relative; margin-bottom: 3px;
}
.nd-block ul li::before { content: '◆'; position: absolute; left: 0; color: var(--purple); font-size: 9px; top: 5px; }
.nd-source { font-size: 12.5px; color: var(--txt-dim); }

/* ================= 战斗界面 ================= */
.battle-mask {
    position: fixed; inset: 0; z-index: 160;
    display: none; align-items: center; justify-content: center;
    background: rgba(3, 6, 14, 0.86); backdrop-filter: blur(8px); padding: 16px;
}
.battle-mask.show { display: flex; }
.battle-panel {
    width: 100%; max-width: 880px; max-height: 92vh;
    display: flex; flex-direction: column;
    background: linear-gradient(180deg, rgba(14, 22, 42, 0.98), rgba(9, 15, 30, 0.99));
    border: 1px solid rgba(120,170,255,0.22);
    border-radius: 20px; overflow: hidden;
    box-shadow: 0 30px 80px rgba(0,0,0,0.7);
    animation: pop 0.2s ease-out;
}
.battle-head {
    display: flex; align-items: center; justify-content: space-between; gap: 14px;
    padding: 14px 20px; border-bottom: 1px solid var(--line);
    background: linear-gradient(90deg, rgba(251,113,133,0.10), transparent 55%);
    flex-wrap: wrap;
}
.monster { display: flex; align-items: center; gap: 12px; flex: 1 1 320px; }
.monster-icon { font-size: 34px; line-height: 1; filter: drop-shadow(0 0 10px rgba(251,113,133,0.6)); }
.monster-info { flex: 1; min-width: 0; }
.monster-name { font-size: 14px; font-weight: 800; margin-bottom: 4px; }
.hp-bar { height: 10px; border-radius: 99px; background: rgba(255,255,255,0.08); overflow: hidden; }
.hp-fill {
    height: 100%; width: 100%;
    background: linear-gradient(90deg, #ef4444, #fb7185);
    box-shadow: 0 0 12px rgba(251,113,133,0.7);
    transition: width 0.4s cubic-bezier(.2,.8,.2,1);
}
.hp-fill.low { background: linear-gradient(90deg, #b91c1c, #f97316); }
.hp-text { font-size: 11.5px; color: var(--txt-dim); margin-top: 3px; }
.battle-meta { display: flex; align-items: center; gap: 12px; }
.q-progress { font-size: 13px; color: var(--txt-dim); font-variant-numeric: tabular-nums; }
.combo-badge {
    display: none; padding: 4px 12px; border-radius: 99px; font-size: 13px; font-weight: 800;
    background: linear-gradient(135deg, #f59e0b, #fb7185); color: #1a0b02;
    box-shadow: 0 0 16px rgba(251, 113, 133, 0.7);
    animation: pop 0.2s;
}
.combo-badge.show { display: inline-block; }
.battle-close {
    width: 34px; height: 34px; border-radius: 50%;
    background: rgba(255,255,255,0.06); border: 1px solid var(--line);
    color: var(--txt); font-size: 15px;
}
.battle-close:hover { background: rgba(251,113,133,0.2); }

.battle-body { flex: 1; overflow-y: auto; padding: 20px; }
.q-card { animation: pop 0.18s ease-out; }
.q-tags { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 14px; }
.tag {
    font-size: 11.5px; padding: 3px 10px; border-radius: 99px;
    background: rgba(255,255,255,0.07); color: var(--txt-dim);
    border: 1px solid rgba(255,255,255,0.08);
}
.tag-type { background: rgba(56,189,248,0.16); color: #7dd3fc; border-color: rgba(56,189,248,0.35); }
.tag-level.lv1 { background: rgba(56,189,248,0.14); color: #7dd3fc; }
.tag-level.lv2 { background: rgba(167,139,250,0.16); color: #c4b5fd; }
.tag-level.lv3 { background: rgba(251,113,133,0.16); color: #fda4af; }
.tag-score { background: rgba(52,211,153,0.14); color: #6ee7b7; }
.tag-xp { background: rgba(168,85,247,0.16); color: #ddd6fe; }
/* 难度分级（题目质量增强）：基础 / 真题 / 拔高 */
.tag-diff { font-weight: 800; letter-spacing: 0.5px; }
.tag-diff.d-basic { background: rgba(52,211,153,0.14); color: #6ee7b7; border-color: rgba(52,211,153,0.4); }
.tag-diff.d-exam { background: rgba(245,158,11,0.16); color: #fcd34d; border-color: rgba(245,158,11,0.45); }
.tag-diff.d-hard { background: rgba(251,113,133,0.16); color: #fda4af; border-color: rgba(251,113,133,0.45); }

.q-stem { font-size: 15.5px; line-height: 1.85; color: #e8f1ff; }
.inline-code {
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
    background: rgba(56,189,248,0.13); color: #7dd3fc;
    padding: 1px 6px; border-radius: 5px; font-size: 13.5px;
}
.code-block {
    margin: 12px 0; padding: 14px 16px; overflow-x: auto;
    background: #050a14; border: 1px solid rgba(120,170,255,0.18);
    border-radius: 10px; font-size: 13px; line-height: 1.7;
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
    color: #a5d8ff; white-space: pre;
}

.q-options { margin-top: 16px; display: flex; flex-direction: column; gap: 10px; }
.opt {
    display: flex; gap: 12px; align-items: flex-start; text-align: left;
    padding: 13px 16px; border-radius: 12px; font-size: 14.5px;
    background: rgba(255,255,255,0.04); border: 1px solid rgba(120,170,255,0.16);
    color: var(--txt); transition: all 0.16s;
}
.opt:hover:not(:disabled) { background: rgba(56,189,248,0.12); border-color: rgba(56,189,248,0.5); transform: translateX(3px); }
.opt:disabled { cursor: default; }
.opt-key {
    flex: 0 0 auto; width: 24px; height: 24px; border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    background: rgba(255,255,255,0.09); font-weight: 800; font-size: 12.5px;
}
.opt.right { background: rgba(52,211,153,0.16); border-color: var(--green); }
.opt.right .opt-key { background: var(--green); color: #04140d; }
.opt.wrong { background: rgba(251,113,133,0.16); border-color: var(--rose); }
.opt.wrong .opt-key { background: var(--rose); color: #2a060c; }

.q-input {
    width: 100%; margin-top: 16px; padding: 13px 15px; resize: vertical;
    background: #050a14; color: #e8f1ff; font-size: 14px; line-height: 1.7;
    border: 1px solid rgba(120,170,255,0.22); border-radius: 12px;
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}
.q-input:focus { outline: none; border-color: var(--cyan); box-shadow: 0 0 0 3px rgba(56,189,248,0.18); }
.shake { animation: shake 0.4s; border-color: var(--rose) !important; }
@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-6px); }
    75% { transform: translateX(6px); }
}

.q-feedback { margin-top: 18px; }

/* ---- 超宽公式兜底 ----
   行间公式（\[...\]）KaTeX 会渲染成 white-space:nowrap 的块，
   公式一长就会撑破卡片、甚至把整页推出横向滚动条。
   这里允许公式块自己横向滚动，宽度不够时用户左右拖动即可。 */
.q-stem .katex-display,
.q-options .katex-display,
.fb-analysis .katex-display,
.fb-answer .katex-display,
.ai-text .katex-display {
    overflow-x: auto; overflow-y: hidden;
    padding: 3px 0;
}
/* 行内公式过长时允许在公式内部断行，避免撑破题干 */
.q-stem .katex, .fb-analysis .katex, .fb-answer .katex, .ai-text .katex { white-space: normal; }

/* ---- 考点讲解外链（题目卡片里的视频/搜索入口） ---- */
.q-links {
    margin-top: 16px; padding: 11px 13px; border-radius: 12px;
    background: rgba(8, 14, 30, 0.55);
    border: 1px solid rgba(120, 170, 255, 0.18);
}
.q-links-head { font-size: 12px; color: var(--txt-dim); margin-bottom: 8px; }
.q-links-body { display: flex; flex-wrap: wrap; gap: 7px; }
.ql-chip {
    display: inline-flex; align-items: center; gap: 5px; max-width: 100%;
    font-size: 12px; line-height: 1.45; text-decoration: none;
    padding: 5px 10px; border-radius: 999px;
    color: #cfe2ff; background: rgba(56, 189, 248, 0.10);
    border: 1px solid rgba(56, 189, 248, 0.30);
    transition: background 0.15s, border-color 0.15s, transform 0.15s;
}
.ql-chip:hover { background: rgba(56, 189, 248, 0.22); border-color: rgba(56, 189, 248, 0.6); transform: translateY(-1px); }
.ql-chip.ql-search { color: var(--txt-dim); background: transparent; border-color: var(--line); }
.ql-chip.ql-search:hover { color: var(--txt); border-color: rgba(120, 170, 255, 0.5); }
.fb { padding: 16px; border-radius: 14px; border: 1px solid; animation: pop 0.2s; }
.fb-ok { background: rgba(52,211,153,0.09); border-color: rgba(52,211,153,0.45); }
.fb-no { background: rgba(251,113,133,0.09); border-color: rgba(251,113,133,0.45); }
.fb-pending { background: rgba(56,189,248,0.07); border-color: rgba(56,189,248,0.35); }
.fb-title { font-weight: 800; font-size: 14px; margin: 8px 0 6px; }
.fb-title:first-child { margin-top: 0; }
.fb-note, .fb-note-inline { font-size: 12.5px; color: var(--amber); }
.fb-answer { font-size: 14px; color: #e8f1ff; }
.fb-analysis { font-size: 13.5px; color: #b9cbe8; }
.fb-source { margin-top: 10px; font-size: 12px; color: var(--purple); }
.fb-keys { margin: 4px 0 0; }
.fb-keys li { font-size: 13px; color: #b9cbe8; padding-left: 16px; position: relative; margin-bottom: 3px; }
.fb-keys li::before { content: '✔'; position: absolute; left: 0; color: var(--green); font-size: 11px; }

/* ---------- 题目质量增强：踩分技巧 / 干扰项批驳 / 同类变式 ---------- */
.fb-tips {
    margin: 8px 0 2px; padding: 9px 12px;
    font-size: 13px; line-height: 1.7; color: #ffe8bd;
    background: rgba(245, 158, 11, 0.10);
    border-left: 3px solid rgba(245, 158, 11, 0.7);
    border-radius: 0 8px 8px 0;
}
.fb-opts { margin: 4px 0 0; }
.fb-opts li {
    padding: 6px 10px 6px 30px; margin-bottom: 5px; position: relative;
    font-size: 13px; line-height: 1.7; border-radius: 8px;
}
.fb-opts li.on-right { background: rgba(52, 211, 153, 0.10); color: #c9f8e5; }
.fb-opts li.on-wrong { background: rgba(251, 113, 133, 0.09); color: #ffd3da; }
.fb-opts .on-key {
    position: absolute; left: 7px; top: 6px;
    width: 17px; height: 17px; line-height: 17px; text-align: center;
    border-radius: 5px; font-size: 11px; font-weight: 800;
    background: rgba(255, 255, 255, 0.12); color: #e8f1ff;
}
.fb-opts .on-txt { display: block; }
.fb-opts .on-why { display: block; margin-top: 3px; font-size: 12.5px; opacity: 0.92; }
.fb-variants { margin: 4px 0 0; }
.fb-variants li {
    padding: 8px 11px; margin-bottom: 6px;
    background: rgba(56, 189, 248, 0.07);
    border: 1px dashed rgba(56, 189, 248, 0.32);
    border-radius: 8px;
}
.fb-variants .va-stem { font-size: 13.5px; color: #dce9ff; line-height: 1.75; }
.fb-variants .va-hint { margin-top: 4px; font-size: 12.5px; color: var(--txt-dim); }

.self-judge { display: flex; gap: 10px; margin-top: 16px; }
.self-result { margin-bottom: 10px; }

.battle-foot {
    display: flex; align-items: center; gap: 12px; justify-content: flex-end;
    padding: 14px 20px; border-top: 1px solid var(--line);
    background: rgba(6, 11, 22, 0.7); flex-wrap: wrap;
}
.foot-hint { margin-right: auto; font-size: 12px; color: var(--txt-dim); }

/* ================= 结算 ================= */
.settle { text-align: center; padding: 12px 4px; }
.settle-icon { font-size: 60px; line-height: 1; animation: pop 0.3s; }
.settle-title { font-size: 24px; font-weight: 900; margin-top: 8px; letter-spacing: 2px; }
.settle.win .settle-title { color: var(--gold); text-shadow: 0 0 22px rgba(168,85,247,0.5); }
.settle.lose .settle-title { color: var(--rose); }
.settle-sub { color: var(--txt-dim); font-size: 13px; }
.settle-grid {
    display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin: 22px 0;
}
.sg {
    background: rgba(255,255,255,0.04); border: 1px solid var(--line);
    border-radius: 12px; padding: 12px 6px;
}
.sg b { display: block; font-size: 20px; color: var(--cyan); font-variant-numeric: tabular-nums; }
.sg span { font-size: 11.5px; color: var(--txt-dim); }
.settle-row { display: flex; justify-content: space-between; padding: 8px 4px; border-bottom: 1px dashed rgba(120,170,255,0.14); font-size: 14px; }
.settle-row b { color: var(--gold); }
.settle-row.hl { color: var(--green); border: none; }
.settle-note { margin-top: 12px; font-size: 13px; color: var(--amber); }
.unlock-box, .ach-box {
    margin-top: 16px; padding: 14px; border-radius: 12px; text-align: left;
    background: rgba(56,189,248,0.07); border: 1px solid rgba(56,189,248,0.28);
}
.ach-box { background: rgba(168,85,247,0.07); border-color: rgba(168,85,247,0.3); margin-top: 10px; }
.ub-title { font-size: 13px; font-weight: 800; color: var(--cyan); margin-bottom: 6px; }
.ach-box .ub-title { color: var(--gold); }
.ub-item { font-size: 13px; color: #cfe0fb; padding: 3px 0; }
.ach-desc { color: var(--txt-dim); font-size: 12px; }

/* ================= 侧栏面板 ================= */
.panel-mask {
    position: fixed; inset: 0; z-index: 170; background: rgba(4,8,18,0.6);
    display: none;
}
.panel-mask.show { display: block; }
.panel {
    position: fixed; top: 0; right: 0; bottom: 0; width: min(460px, 94vw);
    z-index: 180; background: linear-gradient(180deg, #0d1730, #080e1e);
    border-left: 1px solid rgba(120,170,255,0.22);
    transform: translateX(102%); transition: transform 0.28s cubic-bezier(.2,.8,.2,1);
    display: flex; flex-direction: column;
    box-shadow: -20px 0 60px rgba(0,0,0,0.6);
}
.panel.show { transform: translateX(0); }
.panel-head {
    display: flex; align-items: center; gap: 10px;
    padding: 14px 16px; border-bottom: 1px solid var(--line);
}
.panel-tabs { display: flex; gap: 6px; flex: 1; }
.panel-tab {
    flex: 1; padding: 9px 8px; border-radius: 10px; font-size: 12.5px; font-weight: 700;
    background: rgba(255,255,255,0.05); border: 1px solid transparent; color: var(--txt-dim);
}
.panel-tab.active { background: rgba(56,189,248,0.16); color: #fff; border-color: rgba(56,189,248,0.45); }
.panel-body { flex: 1; overflow-y: auto; padding: 16px; }
.panel-view { display: none; }
.panel-view.active { display: block; }

.ach { display: flex; align-items: center; gap: 12px; padding: 11px; border-radius: 12px; margin-bottom: 8px; background: rgba(255,255,255,0.03); border: 1px solid rgba(120,170,255,0.1); }
.ach.got { background: linear-gradient(90deg, rgba(168,85,247,0.12), rgba(255,255,255,0.03)); border-color: rgba(168,85,247,0.35); }
.ach-icon { font-size: 24px; width: 34px; text-align: center; }
.ach.got .ach-icon { filter: drop-shadow(0 0 8px rgba(168,85,247,0.6)); }
.ach-body { flex: 1; }
.ach-name { font-size: 13.5px; font-weight: 800; }
.ach.got .ach-name { color: var(--gold); }
.ach-desc { font-size: 11.5px; color: var(--txt-dim); }
.ach-date { font-size: 11px; color: var(--txt-dim); }
.empty { text-align: center; padding: 60px 20px; color: var(--txt-dim); font-size: 14px; }

.wrong-bar { display: flex; align-items: center; gap: 8px; margin-bottom: 12px; font-size: 12.5px; color: var(--txt-dim); flex-wrap: wrap; }
.wrong-bar span { margin-right: auto; }
.wrong-item { padding: 13px; border-radius: 12px; margin-bottom: 10px; background: rgba(251,113,133,0.06); border: 1px solid rgba(251,113,133,0.24); }
.wi-head { display: flex; justify-content: space-between; font-size: 12px; margin-bottom: 6px; }
.wi-node { color: #fda4af; font-weight: 700; }
.wi-times { color: var(--txt-dim); }
.wi-stem { font-size: 12.5px; color: #cfe0fb; line-height: 1.6; }
.wi-src { font-size: 11px; color: var(--purple); margin-top: 6px; }
.wi-actions { display: flex; gap: 8px; margin-top: 10px; }

.stat-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; margin-bottom: 18px; }
.stat-cell { background: rgba(255,255,255,0.04); border: 1px solid var(--line); border-radius: 12px; padding: 12px; }
.stat-cell span { display: block; font-size: 11.5px; color: var(--txt-dim); }
.stat-cell b { font-size: 19px; color: var(--cyan); font-variant-numeric: tabular-nums; }

/* ================= 考点掌握度热力图 ================= */
.stats-block { margin-bottom: 18px; }
.hm-summary {
    display: flex; flex-wrap: wrap; align-items: center; gap: 8px;
    margin-bottom: 10px; font-size: 12px; color: var(--txt-dim);
}
.hm-s { padding: 3px 9px; border-radius: 999px; font-weight: 700; }
.hm-s b { font-variant-numeric: tabular-nums; }
.hm-s.m0 { background: rgba(255, 255, 255, 0.05); color: #93a2bd; }
.hm-s.m1 { background: rgba(251, 113, 133, 0.16); color: #ffb3bf; }
.hm-s.m2 { background: rgba(245, 158, 11, 0.16); color: #ffd98a; }
.hm-s.m3 { background: rgba(52, 211, 153, 0.16); color: #7ee7bb; }
.hm-hint { margin-left: auto; font-size: 11px; }
.hm-weak { margin-bottom: 10px; font-size: 12px; color: var(--txt-dim); }
.hm-link {
    font: inherit; font-size: 12px; cursor: pointer; margin-left: 6px;
    padding: 3px 9px; border-radius: 999px;
    color: #ffd3da; background: rgba(251, 113, 133, 0.12);
    border: 1px solid rgba(251, 113, 133, 0.4);
}
.hm-link:hover { background: rgba(251, 113, 133, 0.25); }
.hm-wrap { display: flex; flex-direction: column; gap: 10px; }
/* 章分组：69 个考点按「模块 → 章」二级排列，否则格子会糊成一片 */
.hm-chap { margin-bottom: 10px; }
.hm-chap-title {
    font-size: 11px; font-weight: 700; color: #7d8fb0;
    margin-bottom: 6px; padding-left: 2px; letter-spacing: 0.3px;
}
.hm-group-title { font-size: 11.5px; color: var(--txt-dim); margin-bottom: 6px; display: flex; align-items: center; gap: 6px; }
.hm-group-title i { width: 8px; height: 8px; border-radius: 50%; display: inline-block; }
.hm-cells { display: grid; grid-template-columns: repeat(auto-fill, minmax(96px, 1fr)); gap: 7px; }
.hm-cell {
    display: flex; flex-direction: column; align-items: flex-start; gap: 2px;
    font: inherit; cursor: pointer; text-align: left;
    padding: 7px 9px; border-radius: 10px; border: 1px solid;
    transition: transform 0.14s, filter 0.14s;
}
.hm-cell:hover { transform: translateY(-2px); filter: brightness(1.25); }
.hm-cell .hm-name { font-size: 11px; line-height: 1.3; opacity: 0.9; }
.hm-cell .hm-pct { font-size: 15px; font-weight: 900; font-variant-numeric: tabular-nums; }
.hm-cell.m0 { color: #93a2bd; background: rgba(255, 255, 255, 0.04); border-color: rgba(255, 255, 255, 0.1); }
.hm-cell.m1 { color: #ffb3bf; background: rgba(251, 113, 133, 0.12); border-color: rgba(251, 113, 133, 0.42); }
.hm-cell.m2 { color: #ffd98a; background: rgba(245, 158, 11, 0.12); border-color: rgba(245, 158, 11, 0.42); }
.hm-cell.m3 { color: #7ee7bb; background: rgba(52, 211, 153, 0.12); border-color: rgba(52, 211, 153, 0.45); }
.hm-cell.wip { opacity: 0.42; border-style: dashed; }


/* ================= 成就稀有度 ================= */
.ach-head {
    display: flex; flex-wrap: wrap; align-items: center; gap: 8px;
    margin-bottom: 12px; font-size: 12.5px; color: var(--txt-dim);
}
.ach-head b { color: var(--gold); font-size: 15px; font-variant-numeric: tabular-nums; }
.ach-tally { padding: 3px 9px; border-radius: 999px; font-size: 11.5px; font-weight: 700; border: 1px solid; }
.ach-rarity { padding: 1px 7px; border-radius: 999px; font-size: 10.5px; font-weight: 700; border: 1px solid; }
.ach-hidden-tag { padding: 1px 7px; border-radius: 999px; font-size: 10.5px; color: #ddd; background: rgba(255,255,255,0.12); }
.r-common, .ach-tally.r-common, .ach-rarity.r-common { color: #a9b8d4; background: rgba(255,255,255,0.06); border-color: rgba(255,255,255,0.14); }
.r-rare, .ach-tally.r-rare, .ach-rarity.r-rare { color: #c4b5fd; background: rgba(139,92,246,0.16); border-color: rgba(139,92,246,0.5); }
.r-epic, .ach-tally.r-epic, .ach-rarity.r-epic { color: #ffc48a; background: rgba(249,115,22,0.16); border-color: rgba(249,115,22,0.5); }
.r-legend, .ach-tally.r-legend, .ach-rarity.r-legend { color: #ddd6fe; background: rgba(168,85,247,0.18); border-color: rgba(168,85,247,0.6); }
.ach.r-legend.got { border-color: rgba(168,85,247,0.6); }
.ach.r-epic.got { border-color: rgba(249,115,22,0.5); }
.ach-list { display: block; }

/* ================= 破纪录提示 ================= */
.settle-row.rec { color: var(--gold); font-weight: 800; border-bottom-style: solid; border-bottom-color: rgba(168,85,247,0.35); }
.settle-row.rec .rec-old { margin-left: 8px; font-size: 12px; font-weight: 400; opacity: 0.75; }
.rec-up { color: var(--green); font-size: 12.5px; }
.rec-down { color: var(--rose); font-size: 12.5px; }
.rec-eq { color: var(--txt-dim); font-size: 12.5px; }
.play-tips { font-size: 12.5px; color: #b9cbe8; }
.play-tips ul li { padding-left: 16px; position: relative; margin-bottom: 7px; }
.play-tips ul li::before { content: '▸'; position: absolute; left: 0; color: var(--cyan); }
.play-tips b { color: var(--gold); }

/* ================= Toast / 飘字 ================= */
#toastWrap { position: fixed; top: 78px; left: 50%; transform: translateX(-50%); z-index: 300; display: flex; flex-direction: column; gap: 8px; align-items: center; pointer-events: none; }
.toast {
    padding: 11px 20px; border-radius: 99px; font-size: 13.5px; font-weight: 700;
    background: rgba(14,22,42,0.97); border: 1px solid rgba(120,170,255,0.35);
    color: #fff; box-shadow: 0 10px 30px rgba(0,0,0,0.55);
    opacity: 0; transform: translateY(-10px); transition: all 0.25s;
}
.toast.in { opacity: 1; transform: translateY(0); }
.toast.lvup { background: linear-gradient(135deg, #7c3aed, #a855f7); color: #2a1a02; border-color: transparent; }
.toast.ach { background: linear-gradient(135deg, #7c3aed, #38bdf8); color: #fff; border-color: transparent; }
.toast.rec { background: linear-gradient(135deg, #6d28d9, #c4b5fd); color: #2a1a02; border-color: transparent; }

.xp-float {
    position: fixed; left: 50%; top: 42%; transform: translateX(-50%);
    z-index: 250; font-size: 26px; font-weight: 900; pointer-events: none;
    animation: floatUp 1.1s ease-out forwards;
}
.xp-float.plus { color: var(--gold); text-shadow: 0 0 20px rgba(168,85,247,0.8); }
.xp-float.minus { font-size: 16px; color: var(--rose); text-shadow: 0 0 16px rgba(251,113,133,0.7); }
@keyframes floatUp {
    0% { opacity: 0; transform: translate(-50%, 20px) scale(0.8); }
    25% { opacity: 1; transform: translate(-50%, 0) scale(1.12); }
    100% { opacity: 0; transform: translate(-50%, -70px) scale(1); }
}

/* ================= 响应式 ================= */
@media (max-width: 860px) {
    .hud { gap: 12px; padding: 10px 14px; }
    .hud-stats { width: 100%; justify-content: space-between; gap: 8px; }
    .hud-stats .stat { min-width: 60px; }
    .hud-right { width: 100%; }
    .hud-right .btn { flex: 1; }
    .legend { gap: 14px; padding: 10px 14px; }
    .legend-group.hint { margin-left: 0; }
    .map-scroll { padding-bottom: 80px; }
    .battle-body { padding: 14px; }
    .settle-grid { grid-template-columns: repeat(2, 1fr); }
    .q-stem { font-size: 14.5px; }
    .battle-foot { justify-content: stretch; }
    .battle-foot .btn { flex: 1; }
    .foot-hint { width: 100%; margin: 0 0 4px; text-align: center; }
}