/* History Timeline - Mobile-first styles */

:root {
    --color-bg: #1a1a2e;
    --color-card: #16213e;
    --color-card-hover: #1f2b47;
    --color-primary: #e94560;
    --color-secondary: #0f3460;
    --color-success: #00c853;
    --color-error: #ff5252;
    --color-text: #ffffff;
    --color-text-muted: #a0a0a0;
    --color-timeline: #4a5568;

    --transition-speed: 0.3s;
    --border-radius: 12px;
    --spacing-xs: 8px;
    --spacing-sm: 12px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background-color: var(--color-bg);
    color: var(--color-text);
    min-height: 100vh;
    min-height: 100dvh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* Screen management */
.screen {
    display: none;
    flex-direction: column;
    min-height: 100vh;
    min-height: 100dvh;
}

.screen.active {
    display: flex;
}

/* Header */
.header {
    padding: var(--spacing-md);
    text-align: center;
    background: linear-gradient(180deg, rgba(233, 69, 96, 0.2) 0%, transparent 100%);
}

.header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

.header .subtitle {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

.header-game {
    display: flex;
    align-items: center;
    justify-content: space-between;
    text-align: left;
}

.header-game h1 {
    font-size: 1.25rem;
    margin-bottom: 0;
    flex: 1;
    text-align: center;
}

.header-spacer {
    width: 40px;
}

/* Buttons */
button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
}

.btn-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    color: var(--color-text);
    border-radius: 50%;
    transition: background var(--transition-speed);
}

.btn-icon:hover,
.btn-icon:active {
    background: rgba(255, 255, 255, 0.1);
}

.btn-primary {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    width: 100%;
    min-height: 56px;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--color-primary);
    color: var(--color-text);
    font-size: 1.1rem;
    font-weight: 600;
    border-radius: var(--border-radius);
    transition: background var(--transition-speed), transform 0.1s;
}

.btn-primary:hover {
    background: #d63d55;
}

.btn-primary:active {
    transform: scale(0.98);
}

.btn-secondary {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    width: 100%;
    min-height: 48px;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-secondary);
    color: var(--color-text);
    font-size: 1rem;
    font-weight: 500;
    border-radius: var(--border-radius);
    transition: background var(--transition-speed), transform 0.1s;
}

.btn-secondary:hover {
    background: #153a6b;
}

.btn-secondary:active {
    transform: scale(0.98);
}

/* Menu Screen */
.menu-content {
    flex: 1;
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.menu-content h2 {
    font-size: 1.1rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
}

.category-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-lg) var(--spacing-md);
    background: var(--color-card);
    border-radius: var(--border-radius);
    color: var(--color-text);
    font-size: 1rem;
    font-weight: 500;
    transition: background var(--transition-speed), transform 0.1s;
}

.category-btn:hover {
    background: var(--color-card-hover);
}

.category-btn:active {
    transform: scale(0.97);
}

.category-btn .emoji {
    font-size: 2.5rem;
}

/* Stats Box */
.stats-box {
    background: var(--color-card);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    margin-top: auto;
}

.stats-box h3 {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.stats-grid {
    display: flex;
    justify-content: space-around;
}

.stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
}

.stat-label {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

/* Game Screen */
.game-content {
    flex: 1;
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.instruction {
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

.cards-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    overflow-y: auto;
    padding-bottom: var(--spacing-md);
}

/* Event Cards */
.event-card {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    background: var(--color-card);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    cursor: grab;
    user-select: none;
    transition: background var(--transition-speed), transform 0.2s, box-shadow 0.2s;
}

.event-card:active {
    cursor: grabbing;
}

.event-card.dragging {
    background: var(--color-card-hover);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
    transform: scale(1.02);
    z-index: 100;
}

.event-card.drag-over {
    border: 2px dashed var(--color-primary);
}

.drag-handle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    color: var(--color-text-muted);
    flex-shrink: 0;
}

.drag-handle svg {
    width: 20px;
    height: 20px;
}

.event-content {
    flex: 1;
    min-width: 0;
}

.event-text {
    font-size: 1rem;
    font-weight: 500;
    line-height: 1.4;
}

.event-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    background: var(--color-secondary);
    border-radius: 50%;
    font-size: 0.85rem;
    font-weight: 600;
    flex-shrink: 0;
}

/* Result Screen */
.result-content {
    flex: 1;
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    overflow-y: auto;
}

.result-score {
    text-align: center;
    padding: var(--spacing-lg);
    background: var(--color-card);
    border-radius: var(--border-radius);
}

.result-score .score-emoji {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.result-score .score-text {
    font-size: 1.5rem;
    font-weight: 700;
}

.result-score .score-detail {
    color: var(--color-text-muted);
    margin-top: var(--spacing-xs);
}

.result-score.perfect {
    background: linear-gradient(135deg, rgba(0, 200, 83, 0.2), rgba(233, 69, 96, 0.2));
}

/* Timeline Result */
.timeline-result {
    position: relative;
    padding-left: var(--spacing-xl);
}

.timeline-result::before {
    content: '';
    position: absolute;
    left: 12px;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--color-timeline);
    border-radius: 3px;
}

.timeline-item {
    position: relative;
    padding: var(--spacing-sm) 0;
    padding-left: var(--spacing-sm);
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: calc(-1 * var(--spacing-xl) + 6px);
    top: 50%;
    transform: translateY(-50%);
    width: 14px;
    height: 14px;
    background: var(--color-timeline);
    border-radius: 50%;
    border: 3px solid var(--color-bg);
}

.timeline-item.correct::before {
    background: var(--color-success);
}

.timeline-item.incorrect::before {
    background: var(--color-error);
}

.timeline-year {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 4px;
}

.timeline-event {
    font-size: 0.95rem;
    color: var(--color-text);
}

.timeline-status {
    font-size: 0.85rem;
    margin-top: 4px;
}

.timeline-status.correct {
    color: var(--color-success);
}

.timeline-status.incorrect {
    color: var(--color-error);
}

/* Result Actions */
.result-actions {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-top: auto;
    padding-top: var(--spacing-md);
}

/* Animations */
@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

.shake {
    animation: shake 0.3s ease-in-out;
}

@keyframes confetti {
    0% { transform: translateY(0) rotate(0deg); opacity: 1; }
    100% { transform: translateY(-100vh) rotate(720deg); opacity: 0; }
}

.confetti {
    position: fixed;
    width: 10px;
    height: 10px;
    pointer-events: none;
    animation: confetti 2s ease-out forwards;
}

/* Responsive - Tablet+ */
@media (min-width: 768px) {
    .screen {
        max-width: 600px;
        margin: 0 auto;
    }

    .categories-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-md);
    }

    .category-btn {
        padding: var(--spacing-xl) var(--spacing-lg);
    }

    .event-card {
        padding: var(--spacing-lg);
    }

    .result-actions {
        flex-direction: row;
        flex-wrap: wrap;
    }

    .result-actions .btn-primary {
        flex: 1 1 100%;
    }

    .result-actions .btn-secondary {
        flex: 1;
    }
}

/* Ghost element for drag */
.drag-ghost {
    position: fixed;
    pointer-events: none;
    z-index: 1000;
    opacity: 0.9;
    transform: rotate(2deg);
}