/* ========== 答题闯关（主题令牌化 · 大升级） ========== */
/* 全部使用 base.css 的真实主题变量，随深色/浅色及用户主题色自适应 */
.quiz-modal {
    position: fixed;
    inset: 0;
    z-index: 9999;
    display: none;
    align-items: center;
    justify-content: center;
}
.quiz-modal.show { display: flex; }
.quiz-backdrop {
    position: absolute;
    inset: 0;
    background: var(--bg-overlay, rgba(15, 23, 42, .55));
    backdrop-filter: blur(4px);
}
.quiz-card {
    position: relative;
    width: min(460px, 92vw);
    max-height: 88vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    background: var(--bg-card, #1e293b);
    border: 1px solid var(--border-color, #334155);
    border-radius: 18px;
    box-shadow: var(--shadow-xl, 0 20px 40px rgba(0, 0, 0, .7));
    animation: quizPop .24s cubic-bezier(.34, 1.3, .64, 1);
}
@keyframes quizPop {
    from { transform: translateY(14px) scale(.97); opacity: 0; }
    to { transform: translateY(0) scale(1); opacity: 1; }
}

/* 渐变 Hero 头（随主题色变化） */
.quiz-header {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 24px 22px 22px;
    border-bottom: none;
    overflow: hidden;
    background: var(--primary-gradient, linear-gradient(135deg, #2563eb, #3b82f6));
}
.quiz-header::before,
.quiz-header::after {
    content: '';
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, .16);
    filter: blur(2px);
    pointer-events: none;
}
.quiz-header::before { width: 140px; height: 140px; top: -52px; right: -36px; }
.quiz-header::after { width: 88px; height: 88px; bottom: -40px; left: -24px; background: rgba(255, 255, 255, .1); }
.quiz-title {
    position: relative;
    z-index: 1;
    font-size: 19px;
    font-weight: 800;
    letter-spacing: .5px;
    color: #fff;
    text-shadow: 0 1px 2px rgba(15, 23, 42, .18);
}
.quiz-close {
    position: relative;
    z-index: 2;
    border: none;
    background: rgba(255, 255, 255, .18);
    color: #fff;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    font-size: 17px;
    line-height: 1;
    cursor: pointer;
    transition: background .15s, transform .15s;
}
.quiz-close:hover { background: rgba(255, 255, 255, .34); transform: rotate(90deg); }
.quiz-body {
    padding: 20px;
    overflow-y: auto;
}

/* 进度条 + 圆点 */
.quiz-bar {
    height: 7px;
    border-radius: var(--radius-full, 999px);
    background: var(--bg-tertiary, #334155);
    overflow: hidden;
    margin-bottom: 14px;
}
.quiz-bar-fill {
    display: block;
    height: 100%;
    border-radius: var(--radius-full, 999px);
    background: var(--primary-gradient, linear-gradient(135deg, #2563eb, #3b82f6));
    transition: width .35s cubic-bezier(.2, .8, .2, 1);
}
.quiz-progress {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary, #cbd5e1);
}
.quiz-dots { display: flex; gap: 7px; }
.quiz-dot {
    width: 9px; height: 9px; border-radius: 50%;
    background: var(--bg-tertiary, #334155);
    transition: background .2s, box-shadow .2s, transform .2s;
}
.quiz-dot.is-done { background: var(--primary, #3b82f6); }
.quiz-dot.is-cur { background: var(--primary, #3b82f6); transform: scale(1.25); box-shadow: 0 0 0 4px var(--primary-glow, rgba(59, 130, 246, .2)); }

/* 题目 */
.quiz-q {
    position: relative;
    font-size: 16.5px;
    font-weight: 600;
    line-height: 1.55;
    color: var(--text-primary, #f1f5f9);
    margin-bottom: 18px;
    padding-left: 38px;
}
.quiz-q-no {
    position: absolute;
    left: 0; top: 1px;
    width: 28px; height: 28px;
    border-radius: 9px;
    display: grid; place-items: center;
    font-size: 13px; font-weight: 800;
    color: #fff;
    background: var(--primary-gradient, linear-gradient(135deg, #2563eb, #3b82f6));
}
.quiz-options { display: flex; flex-direction: column; gap: 12px; }
.quiz-opt {
    position: relative;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 16px;
    border: 1.5px solid var(--border-color, #334155);
    border-radius: var(--radius-lg, 12px);
    background: var(--bg-secondary, #1e293b);
    cursor: pointer;
    font-size: 14.5px;
    color: var(--text-primary, #f1f5f9);
    transition: border-color .18s, background .18s, transform .12s, box-shadow .18s;
    text-align: left;
}
.quiz-opt:hover {
    border-color: var(--primary, #3b82f6);
    box-shadow: var(--shadow-md, 0 4px 12px rgba(0, 0, 0, .5));
    transform: translateY(-2px);
}
.quiz-opt.is-selected {
    border-color: var(--primary, #3b82f6);
    background: var(--primary-glow, rgba(37, 99, 235, .15));
    box-shadow: 0 8px 22px var(--primary-glow-strong, rgba(37, 99, 235, .3));
}
.quiz-opt.is-selected::after {
    content: '✓';
    position: absolute;
    right: 14px; top: 50%;
    transform: translateY(-50%);
    font-size: 15px; font-weight: 800;
    color: var(--primary, #3b82f6);
}
.quiz-opt-badge {
    flex: none;
    width: 26px; height: 26px;
    border-radius: 50%;
    display: grid; place-items: center;
    font-size: 13px; font-weight: 700;
    background: var(--bg-tertiary, #334155);
    color: var(--text-secondary, #cbd5e1);
    transition: background .18s, color .18s;
}
.quiz-opt.is-selected .quiz-opt-badge {
    background: var(--primary-gradient, linear-gradient(135deg, #2563eb, #3b82f6));
    color: #fff;
}

/* 按钮 */
.quiz-btn {
    margin-top: 22px;
    width: 100%;
    padding: 14px;
    border: none;
    border-radius: var(--radius-lg, 12px);
    background: var(--primary-gradient, linear-gradient(135deg, #2563eb, #3b82f6));
    color: #fff;
    font-size: 15.5px;
    font-weight: 700;
    letter-spacing: .5px;
    cursor: pointer;
    box-shadow: 0 10px 24px var(--primary-glow-strong, rgba(37, 99, 235, .35));
    transition: transform .12s, box-shadow .18s, opacity .18s;
}
.quiz-btn:hover { transform: translateY(-2px); box-shadow: 0 14px 30px var(--primary-glow-strong, rgba(37, 99, 235, .4)); }
.quiz-btn:active { transform: translateY(0); }
.quiz-btn:disabled { opacity: .5; cursor: not-allowed; box-shadow: none; transform: none; }
.quiz-btn.ghost {
    background: var(--bg-tertiary, #334155);
    color: var(--text-primary, #f1f5f9);
    box-shadow: none;
}
.quiz-btn.ghost:hover { background: var(--bg-card-hover, #334155); transform: none; }

/* 起始 / 结果 */
.quiz-center { text-align: center; padding: 18px 4px 6px; }
.quiz-hero-icon {
    width: 86px; height: 86px;
    margin: 2px auto 16px;
    border-radius: 26px;
    display: grid; place-items: center;
    font-size: 44px;
    background: var(--primary-gradient, linear-gradient(135deg, #2563eb, #3b82f6));
    box-shadow: 0 14px 30px var(--primary-glow-strong, rgba(37, 99, 235, .4));
    animation: quizFloat 3s ease-in-out infinite;
}
@keyframes quizFloat { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-7px); } }
.quiz-start-title { font-size: 22px; font-weight: 800; color: var(--text-primary, #f1f5f9); margin-bottom: 8px; }
.quiz-sub { font-size: 14px; color: var(--text-secondary, #cbd5e1); margin-bottom: 6px; }
.quiz-meta {
    display: flex;
    gap: 10px;
    justify-content: center;
    margin: 16px 0 4px;
}
.quiz-meta-pill {
    flex: 1 1 0;
    max-width: 150px;
    padding: 10px 8px;
    border-radius: var(--radius-md, 8px);
    background: var(--bg-tertiary, #334155);
    border: 1px solid var(--border-color-light, transparent);
}
.quiz-meta-num { font-size: 17px; font-weight: 800; color: var(--text-primary, #f1f5f9); }
.quiz-meta-label { font-size: 12px; color: var(--text-tertiary, #94a3b8); margin-top: 2px; }
.quiz-chip {
    display: block;
    width: fit-content;
    margin: 14px auto 2px;
    padding: 6px 16px;
    border-radius: var(--radius-full, 999px);
    font-size: 13px;
    font-weight: 600;
    color: var(--primary, #3b82f6);
    background: var(--primary-glow, rgba(37, 99, 235, .15));
}
.quiz-big { font-size: 42px; margin-bottom: 10px; animation: quizPopBig .4s ease; }
@keyframes quizPopBig { from { transform: scale(.6); opacity: 0; } to { transform: scale(1); opacity: 1; } }
.quiz-score {
    font-size: 30px;
    font-weight: 800;
    background: var(--primary-gradient, linear-gradient(135deg, #2563eb, #3b82f6));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: var(--primary, #3b82f6);
    margin: 10px 0;
    animation: quizScoreIn .5s cubic-bezier(.2, .8, .2, 1);
}
@keyframes quizScoreIn { from { transform: scale(.5); opacity: 0; } to { transform: scale(1); opacity: 1; } }

/* 结果正确率环形图 */
.quiz-ring {
    width: 124px; height: 124px;
    border-radius: 50%;
    margin: 4px auto 14px;
    background: conic-gradient(var(--primary, #3b82f6) calc(var(--p, 0) * 1%), var(--bg-tertiary, #334155) 0);
    display: grid; place-items: center;
    animation: quizRingIn .6s cubic-bezier(.2, .8, .2, 1);
}
@keyframes quizRingIn { from { transform: scale(.7); opacity: 0; } to { transform: scale(1); opacity: 1; } }
.quiz-ring-inner {
    width: 94px; height: 94px;
    border-radius: 50%;
    background: var(--bg-card, #1e293b);
    display: grid;
    align-content: center;
    justify-items: center;
    box-shadow: inset 0 0 0 1px var(--border-color, #334155);
}
.quiz-ring-num { font-size: 26px; font-weight: 800; color: var(--text-primary, #f1f5f9); line-height: 1; }
.quiz-ring-label { font-size: 12px; color: var(--text-tertiary, #94a3b8); margin-top: 4px; }

.quiz-loading, .quiz-empty, .quiz-error {
    text-align: center; padding: 44px 0; color: var(--text-secondary, #cbd5e1); font-size: 14px;
}

/* 结果解析 */
.quiz-explain-item {
    position: relative;
    border: 1px solid var(--border-color, #334155);
    border-left-width: 4px;
    border-radius: var(--radius-md, 8px);
    padding: 12px 14px;
    margin-bottom: 10px;
    background: var(--bg-secondary, #1e293b);
}
.quiz-explain-item.is-right { border-color: var(--success, #22c55e); border-left-color: var(--success, #22c55e); background: var(--success-bg, rgba(34, 197, 94, .12)); }
.quiz-explain-item.is-wrong { border-color: var(--danger, #ef4444); border-left-color: var(--danger, #ef4444); background: var(--danger-bg, rgba(239, 68, 68, .12)); }
.quiz-explain-q { font-size: 14px; font-weight: 600; margin-bottom: 4px; color: var(--text-primary, #f1f5f9); }
.quiz-explain-tag { font-size: 12px; font-weight: 700; margin-bottom: 6px; }
.quiz-explain-tag.ok { color: var(--success, #16a34a); }
.quiz-explain-tag.no { color: var(--danger, #dc2626); }
.quiz-explain-text { font-size: 13px; color: var(--text-secondary, #cbd5e1); line-height: 1.55; }
.quiz-retry-note { font-size: 12px; color: var(--text-tertiary, #94a3b8); margin-top: 6px; text-align: center; }

/* 全局进场动效 */
.quiz-body > * { animation: quizIn .28s ease both; }
@keyframes quizIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }