/* ==========================================================================
   QUIZ.CSS - Practice Console & Formula Card Styling
   ========================================================================== */

/* --- Topic Grid & Hub Portal --- */
.topic-hub-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.topic-hub-card {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    min-height: 200px;
}

.topic-hub-progress {
    margin-top: 1rem;
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* --- Workstation Layout (Theory + Quiz tabs) --- */
.workstation-nav-tabs {
    display: flex;
    gap: 1rem;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 0.5rem;
    margin-bottom: 2rem;
}

.tab-btn {
    padding: 0.6rem 1.2rem;
    font-weight: 700;
    font-size: 1rem;
    color: var(--text-secondary);
    border-radius: var(--border-radius-sm);
    transition: var(--transition);
}

.tab-btn.active {
    color: var(--primary);
    background: var(--primary-glow);
}

/* --- Formula Sheet & Cards --- */
.formula-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 1.2rem;
    margin-top: 1.5rem;
}

.formula-card {
    padding: 1.2rem;
    border-radius: var(--border-radius-sm);
    border-left: 4px solid var(--secondary);
    background: var(--surface);
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.formula-title {
    font-weight: 700;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.formula-expr {
    font-family: 'Outfit', monospace;
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--secondary);
    background: var(--border-color);
    padding: 0.4rem;
    border-radius: 4px;
    text-align: center;
}

/* --- Difficulty Filter Pills --- */
.difficulty-selector {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
    margin-bottom: 1.5rem;
}

.diff-pill {
    padding: 0.4rem 1rem;
    border-radius: 20px;
    font-weight: 700;
    font-size: 0.85rem;
    text-transform: uppercase;
    border: 1px solid var(--border-color);
    background: var(--surface);
    color: var(--text-secondary);
    transition: var(--transition);
}

.diff-pill.active {
    color: #fff;
}

.diff-pill[data-diff="all"].active {
    background: var(--primary);
    border-color: var(--primary);
}

.diff-pill[data-diff="beginner"].active {
    background: var(--info);
    border-color: var(--info);
}

.diff-pill[data-diff="easy"].active {
    background: var(--success);
    border-color: var(--success);
}

.diff-pill[data-diff="medium"].active {
    background: var(--warning);
    border-color: var(--warning);
}

.diff-pill[data-diff="hard"].active {
    background: var(--danger);
    border-color: var(--danger);
}

.diff-pill[data-diff="expert"].active {
    background: var(--secondary);
    border-color: var(--secondary);
}

/* --- Question Card Interface --- */
.question-card {
    position: relative;
    padding: 2.5rem;
    border-radius: var(--border-radius-md);
    margin-bottom: 1.5rem;
    overflow: hidden;
    background: radial-gradient(circle at top left, rgba(127, 90, 240, 0.05), transparent 60%), var(--surface);
    border: 1px solid rgba(127, 90, 240, 0.15);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.3);
    transition: var(--transition);
}

.question-card:hover {
    border-color: rgba(127, 90, 240, 0.3);
    box-shadow: 0 20px 45px rgba(0, 0, 0, 0.45), 0 0 20px rgba(127, 90, 240, 0.15);
}

.question-card::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 280px;
    height: 280px;
    background-image: url('../images/logo.png');
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
    transform: translate(-50%, -50%);
    opacity: 0.03;
    /* Faint watermark */
    pointer-events: none;
    z-index: 0;
    mix-blend-mode: screen;
}

[data-theme="light"] .question-card::before {
    opacity: 0.045;
    mix-blend-mode: multiply;
}

.question-card>* {
    position: relative;
    z-index: 1;
}

.question-text {
    font-size: 1.2rem;
    font-weight: 600;
    line-height: 1.5;
    margin-bottom: 2rem;
}

.options-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2rem;
}

.option-btn {
    width: 100%;
    padding: 1.1rem 1.6rem;
    border-radius: var(--border-radius-sm);
    border: 1px solid var(--border-color);
    background: var(--surface);
    color: var(--text-primary);
    text-align: left;
    font-weight: 500;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    display: flex;
    align-items: center;
    gap: 1.2rem;
    position: relative;
    overflow: hidden;
}

.option-btn:hover {
    border-color: var(--primary);
    background: var(--primary-glow);
    transform: translateX(4px);
    box-shadow: 0 4px 15px rgba(127, 90, 240, 0.1);
}

.option-btn.selected {
    border-color: var(--primary);
    background: linear-gradient(90deg, var(--primary-glow) 0%, rgba(127, 90, 240, 0.02) 100%);
    font-weight: 600;
    box-shadow: 0 0 15px rgba(127, 90, 240, 0.15);
}

.option-btn.correct {
    border-color: var(--success) !important;
    background: hsla(145, 80%, 42%, 0.1) !important;
    color: var(--success) !important;
    font-weight: 600;
    box-shadow: 0 0 15px rgba(16, 185, 129, 0.15) !important;
}

.option-btn.incorrect {
    border-color: var(--danger) !important;
    background: hsla(355, 85%, 55%, 0.08) !important;
    color: var(--danger) !important;
    font-weight: 600;
    box-shadow: 0 0 15px rgba(239, 68, 68, 0.12) !important;
}

.option-index {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.85rem;
}

.option-btn.correct .option-index {
    background: var(--success);
    color: #fff;
}

.option-btn.incorrect .option-index {
    background: var(--danger);
    color: #fff;
}

/* --- Detailed Explanations Panel --- */
.solution-panel {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

.solution-subcard {
    padding: 1.2rem;
    border-radius: var(--border-radius-sm);
    background: var(--surface);
    margin-bottom: 1.2rem;
    border-left: 3px solid var(--primary);
}

.solution-subcard.danger-light {
    border-left-color: var(--danger);
    background: hsla(355, 85%, 55%, 0.03);
}

.solution-subcard.success-light {
    border-left-color: var(--success);
    background: hsla(145, 80%, 42%, 0.03);
}

.solution-subcard h4 {
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

/* --- Control Headers (Timers, Scoreboard) --- */
.quiz-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 1.5rem;
    padding: 1rem 1.5rem;
    border-radius: var(--border-radius-sm);
}

.timer-box,
.score-box {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-weight: 700;
    font-size: 1.1rem;
}

/* --- Layout Grid --- */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    margin-bottom: 2rem;
}

@media screen and (max-width: 1024px) {
    .dashboard-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media screen and (max-width: 580px) {
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
}

/* --- Stat Tiles --- */
.stat-card {
    text-align: center;
    padding: 2rem 1.5rem;
    position: relative;
    border-radius: var(--border-radius-md);
}

.stat-icon {
    font-size: 1.8rem;
    margin-bottom: 0.8rem;
}

.stat-val {
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 0.3rem;
    font-family: var(--font-heading);
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 600;
}

/* --- Weak / Strong Areas --- */
.topic-analytics-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.8rem 0;
    border-bottom: 1px solid var(--border-color);
}

.topic-analytics-row:last-child {
    border-bottom: none;
}

.topic-tag {
    font-weight: 600;
    font-size: 0.95rem;
}

.strength-indicator {
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
}

.indicator-strong {
    background: hsla(145, 80%, 42%, 0.15);
    color: var(--success);
}

.indicator-weak {
    background: hsla(355, 85%, 55%, 0.15);
    color: var(--danger);
}

.timer-box {
    color: var(--danger);
}

.score-box {
    color: var(--success);
}