/* VSumme.ru — Main Stylesheet */

:root {
    --vsumme-primary: #4361ee;
    --vsumme-success: #2ec4b6;
    --vsumme-warning: #ff9f1c;
    --vsumme-danger: #e71d36;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: #f8f9fa;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1;
}

/* Streak badge */
.streak-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.25rem 0.75rem;
    border-radius: 2rem;
    background: linear-gradient(135deg, #ff9f1c, #e71d36);
    color: #fff;
    font-weight: 600;
    font-size: 0.875rem;
}

/* XP progress bar */
.xp-bar {
    height: 8px;
    border-radius: 4px;
    background-color: #e9ecef;
    overflow: hidden;
}

.xp-bar-fill {
    height: 100%;
    border-radius: 4px;
    background: linear-gradient(90deg, var(--vsumme-primary), var(--vsumme-success));
    transition: width 0.6s ease;
}

/* Achievement card */
.achievement-card {
    text-align: center;
    padding: 1rem;
    border-radius: 0.5rem;
    border: 2px solid #e9ecef;
    transition: transform 0.2s, box-shadow 0.2s;
}

.achievement-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.achievement-card.earned {
    border-color: var(--vsumme-warning);
    background: linear-gradient(135deg, #fff8e1, #fff3cd);
}

/* Timer */
.timer-display {
    font-size: 1.5rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
}

.timer-display.warning {
    color: var(--vsumme-warning);
}

.timer-display.danger {
    color: var(--vsumme-danger);
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* Test answer options */
.answer-option {
    cursor: pointer;
    border: 2px solid #dee2e6;
    border-radius: 0.5rem;
    padding: 0.75rem 1rem;
    margin-bottom: 0.5rem;
    transition: border-color 0.2s, background-color 0.2s;
}

.answer-option:hover {
    border-color: var(--vsumme-primary);
    background-color: #f0f3ff;
}

.answer-option.selected {
    border-color: var(--vsumme-primary);
    background-color: #e8edff;
}

.answer-option.correct {
    border-color: var(--vsumme-success);
    background-color: #d1f2eb;
}

.answer-option.incorrect {
    border-color: var(--vsumme-danger);
    background-color: #fde8eb;
}

/* Code block */
.code-block {
    background: #2d2d2d;
    color: #f8f8f2;
    border-radius: 0.5rem;
    padding: 1rem;
    font-family: 'Fira Code', 'Consolas', monospace;
    font-size: 0.875rem;
    overflow-x: auto;
}