/* ============================================
   FluentMaster - Challenge, SM-2 & New Features CSS
   ============================================ */

/* ===== Challenge Mode ===== */
.challenge-container { padding: 20px; }
.challenge-container h2 { margin-bottom: 4px; }
.challenge-modes { display: flex; flex-direction: column; gap: 12px; margin-top: 16px; }

.challenge-leaderboard {
    margin-top: 24px;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 16px;
    border: 1px solid var(--border);
}
.challenge-leaderboard h3 { margin-bottom: 12px; font-size: 1rem; }
.lb-item {
    display: flex; justify-content: space-between; align-items: center;
    padding: 10px 0;
    border-bottom: 1px solid var(--border);
}
.lb-item:last-child { border-bottom: none; }
.lb-item strong { color: var(--primary); font-family: var(--font-display); }

.challenge-active-container { padding: 0; height: 100%; display: flex; flex-direction: column; }
.challenge-top-bar {
    display: flex; align-items: center; justify-content: space-between;
    padding: 12px 16px;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
}
.challenge-timer {
    font-size: 1.8rem; font-weight: 900; font-family: var(--font-display);
    color: var(--primary);
    min-width: 50px; text-align: center;
}
.challenge-score-display {
    display: flex; align-items: center; gap: 6px;
    font-weight: 700;
}
.challenge-area {
    flex: 1; padding: 20px; display: flex; flex-direction: column;
    align-items: center; justify-content: center;
}
.challenge-question {
    font-size: 1.2rem; font-weight: 600; text-align: center;
    margin-bottom: 20px; line-height: 1.5;
}
.challenge-options {
    display: flex; flex-direction: column; gap: 10px; width: 100%; max-width: 400px;
}

/* ===== Spaced Repetition ===== */
.sr-container { padding: 20px; }
.sr-container h2 { margin-bottom: 4px; }
.sr-stats-bar {
    display: grid; grid-template-columns: repeat(4, 1fr);
    gap: 8px; margin: 16px 0;
}
.sr-stat {
    text-align: center; background: var(--bg-card);
    padding: 12px 6px; border-radius: var(--radius);
    border: 1px solid var(--border);
}
.sr-stat strong {
    display: block; font-size: 1.3rem; font-family: var(--font-display);
    color: var(--primary);
}
.sr-stat span { font-size: 0.7rem; color: var(--text-secondary); }

.sr-due-card {
    text-align: center; margin-top: 20px;
    background: linear-gradient(135deg, rgba(108,99,255,0.05), rgba(139,92,246,0.08));
    border: 1px solid rgba(108,99,255,0.2);
    border-radius: var(--radius-lg);
    padding: 24px 16px;
}
.sr-due-count {
    font-size: 1rem; margin-bottom: 16px; color: var(--text-secondary);
}
.sr-due-count span:first-child {
    font-size: 2rem; font-weight: 900; font-family: var(--font-display);
    color: var(--primary); display: block; margin-bottom: 4px;
}

.sr-active-container { padding: 0; height: 100%; display: flex; flex-direction: column; }
.sr-top-bar {
    display: flex; align-items: center; justify-content: space-between;
    padding: 12px 16px;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
}
.sr-top-bar span { font-weight: 600; font-size: 0.9rem; }

.sr-card-area {
    flex: 1; display: flex; align-items: center; justify-content: center;
    padding: 20px;
}

.sr-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl, 16px);
    padding: 32px 24px;
    text-align: center;
    width: 100%; max-width: 380px;
    box-shadow: var(--shadow-lg);
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    min-height: 240px;
    display: flex; flex-direction: column; justify-content: center;
}
.sr-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-xl); }
.sr-card.flipped { cursor: default; }

.sr-word { font-size: 1.8rem; font-weight: 800; font-family: var(--font-display); margin-bottom: 8px; }
.sr-phonetic { font-size: 0.9rem; color: var(--text-secondary); font-style: italic; margin-bottom: 8px; }
.sr-translation { font-size: 1.3rem; color: var(--primary); margin: 12px 0; }
.sr-example { font-size: 0.85rem; color: var(--text-secondary); font-style: italic; margin-bottom: 16px; }

.sr-listen-btn { margin: 12px auto; }

.sr-grade-btns {
    display: grid; grid-template-columns: repeat(4, 1fr);
    gap: 8px; margin-top: 16px;
}
.sr-grade-btn {
    display: flex; flex-direction: column; align-items: center; gap: 4px;
    padding: 10px 6px; border: 2px solid var(--border); border-radius: var(--radius);
    background: var(--bg); cursor: pointer; font-size: 0.7rem; font-weight: 600;
    transition: all 0.2s;
}
.sr-grade-btn i { font-size: 1rem; }
.sr-grade-btn.again { border-color: #EF4444; color: #EF4444; }
.sr-grade-btn.again:hover { background: rgba(239,68,68,0.1); }
.sr-grade-btn.hard { border-color: #F59E0B; color: #F59E0B; }
.sr-grade-btn.hard:hover { background: rgba(245,158,11,0.1); }
.sr-grade-btn.good { border-color: #10B981; color: #10B981; }
.sr-grade-btn.good:hover { background: rgba(16,185,129,0.1); }
.sr-grade-btn.easy { border-color: #6C63FF; color: #6C63FF; }
.sr-grade-btn.easy:hover { background: rgba(108,99,255,0.1); }

/* ===== Notification settings ===== */
.setting-item select {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg-card);
    color: var(--text);
    font-size: 0.9rem;
}

/* ===== Dark mode overrides for new elements ===== */
.dark-mode .sr-card { background: var(--bg-card); border-color: var(--border); }
.dark-mode .sr-grade-btn { background: var(--bg); }
.dark-mode .challenge-leaderboard { background: var(--bg-card); }
.dark-mode .sr-stat { background: var(--bg-card); }
.dark-mode .setting-item select { background: var(--bg); color: var(--text); border-color: var(--border); }

/* ===== Extra responsive ===== */
@media (max-width: 360px) {
    .sr-grade-btns { grid-template-columns: repeat(2, 1fr); }
    .sr-stats-bar { grid-template-columns: repeat(2, 1fr); }
    .challenge-timer { font-size: 1.4rem; }
}