/* ═══════════════════════════════════════════════════════════════════
   最小对立对听辨 Minimal-Pair Shooter (E2) — /chs/English/MinimalPairs
   主色：橄榄绿 #4d7c0f → #65a30d。英语学习中心的卡片里这一色系还没人用，
   和 Stress Beat 的靛蓝、Preposition Pictures 的青绿、Chinglish Fixer 的
   琥珀在网格里一眼分得开。
   ═══════════════════════════════════════════════════════════════════ */

/* ── 等级选择 ─────────────────────────────────────────────────────── */
.mp-level-btn {
    border: 2px solid var(--bs-border-color);
    background: var(--bs-body-bg);
    color: var(--bs-body-color);
    border-radius: 0.5rem;
    padding: 0.4rem 0.9rem;
    font-weight: 600;
    line-height: 1.2;
    transition: background-color 0.15s, border-color 0.15s, color 0.15s;
}

.mp-level-btn:hover {
    border-color: #65a30d;
}

.mp-level-btn.active {
    background: #4d7c0f;
    border-color: #4d7c0f;
    color: #fff;
}

/* ── 播放区 ───────────────────────────────────────────────────────── */
.mp-speaker {
    font-size: clamp(2.4rem, 9vw, 3.4rem);
    color: #4d7c0f;
    line-height: 1;
}

/* ── 两个选项 ─────────────────────────────────────────────────────── */
.mp-choices {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.75rem;
    max-width: 34rem;
    margin: 0 auto;
}

.mp-choice {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.15rem;
    padding: 1rem 0.5rem;
    border: 2px solid #d9f99d;
    background: var(--bs-body-bg);
    color: var(--bs-body-color);
    border-radius: 0.75rem;
    cursor: pointer;
    transition: transform 0.1s, background-color 0.15s, border-color 0.15s;
}

.mp-choice:hover:not(:disabled) {
    border-color: #65a30d;
    transform: translateY(-2px);
}

.mp-choice:disabled {
    cursor: default;
}

.mp-choice-word {
    font-size: clamp(1.3rem, 5.5vw, 1.9rem);
    font-weight: 700;
    letter-spacing: 0.01em;
    line-height: 1.15;
}

.mp-choice-ipa {
    font-size: 0.9rem;
    opacity: 0.75;
}

.mp-choice-correct {
    background: #198754;
    border-color: #198754;
    color: #fff;
    transform: scale(1.03);
}

.mp-choice-wrong {
    background: #dc3545;
    border-color: #dc3545;
    color: #fff;
    opacity: 0.85;
}

/* ── 答案详情 ─────────────────────────────────────────────────────── */
.mp-detail-row {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: 0.5rem;
    padding: 0.2rem 0;
}

/* 念的是哪个——一眼看得出来，不用回头找。 */
.mp-detail-target .mp-detail-word::before {
    content: "🔊 ";
}

.mp-detail-word {
    font-weight: 700;
    font-size: 1.1rem;
}

.mp-detail-ipa {
    opacity: 0.8;
}

.mp-detail-meaning {
    font-size: 0.9rem;
    opacity: 0.85;
}

/* ── 复习列表 ─────────────────────────────────────────────────────── */
.mp-review-pair {
    font-weight: 700;
    letter-spacing: 0.01em;
}

/* ── 对立音参考表 ─────────────────────────────────────────────────── */
.mp-contrast-ipa {
    font-weight: 700;
    color: #4d7c0f;
    white-space: nowrap;
}

/* ── 深色模式 ─────────────────────────────────────────────────────── */
[data-bs-theme="dark"] .mp-speaker { color: #a3e635; }
[data-bs-theme="dark"] .mp-contrast-ipa { color: #a3e635; }
[data-bs-theme="dark"] .mp-choice { border-color: #4a5a2b; }
[data-bs-theme="dark"] .mp-choice:hover:not(:disabled) { border-color: #a3e635; }
[data-bs-theme="dark"] .mp-level-btn.active { background: #65a30d; border-color: #65a30d; }