/* ============ CSS Variables ============ */
:root {
    --bg-primary: #0f0e17;
    --bg-secondary: #1a1932;
    --bg-card: #fffffe;
    --bg-card-dark: #232136;
    --accent: #ff8906;
    --accent-glow: rgba(255, 137, 6, 0.3);
    --correct: #2cb67d;
    --correct-glow: rgba(44, 182, 125, 0.3);
    --wrong: #e53170;
    --wrong-glow: rgba(229, 49, 112, 0.3);
    --text-heading: #fffffe;
    --text-body: #a7a9be;
    --text-dark: #0f0e17;
    --timeline-line: #a7a9be;
    --font-display: 'Playfair Display', Georgia, serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

/* ============ Utility ============ */
.hidden {
    display: none !important;
}

/* ============ Reset & Base ============ */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    height: 100%;
    overflow: hidden;
}

body {
    font-family: var(--font-body);
    background: var(--bg-primary);
    color: var(--text-heading);
    -webkit-font-smoothing: antialiased;
}

/* ============ Screens ============ */
.screen {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.4s ease, visibility 0.4s ease;
    z-index: 1;
    overflow-y: auto;
}

.screen.active {
    opacity: 1;
    visibility: visible;
    z-index: 10;
}

/* ============ Start Screen ============ */
#screen-start {
    align-items: flex-start;
    justify-content: flex-start;
}

.start-content {
    text-align: center;
    padding: 2rem;
    max-width: 480px;
    margin: auto;
}

.logo-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
    animation: float 3s ease-in-out infinite;
}

.title {
    font-family: var(--font-display);
    font-size: 4rem;
    font-weight: 900;
    letter-spacing: 0.05em;
    background: linear-gradient(135deg, var(--accent), #ffbe6f);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
}

.subtitle {
    font-size: 1.2rem;
    color: var(--text-body);
    margin-bottom: 1.5rem;
    font-weight: 500;
}

.description {
    font-size: 0.95rem;
    color: var(--text-body);
    line-height: 1.6;
    margin-bottom: 2.5rem;
    opacity: 0.8;
}

/* ============ Difficulty Select ============ */
.difficulty-select {
    margin-top: 0.5rem;
}

.difficulty-label {
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-body);
    margin-bottom: 1rem;
    opacity: 0.7;
}

.difficulty-buttons {
    display: flex;
    gap: 0.8rem;
    justify-content: center;
}

.btn-difficulty {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.3rem;
    padding: 1rem 1.3rem;
    border: 2px solid rgba(255, 255, 255, 0.08);
    border-radius: 14px;
    background: var(--bg-card-dark);
    cursor: pointer;
    transition: all 0.25s ease;
    min-width: 110px;
}

.btn-difficulty .diff-icon {
    font-size: 1.5rem;
}

.btn-difficulty .diff-name {
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-heading);
}

.btn-difficulty .diff-desc {
    font-size: 0.7rem;
    color: var(--text-body);
    opacity: 0.7;
}

.btn-difficulty.easy:hover {
    border-color: var(--correct);
    box-shadow: 0 4px 24px var(--correct-glow);
    transform: translateY(-3px);
}

.btn-difficulty.medium:hover {
    border-color: var(--accent);
    box-shadow: 0 4px 24px var(--accent-glow);
    transform: translateY(-3px);
}

.btn-difficulty.hard:hover {
    border-color: var(--wrong);
    box-shadow: 0 4px 24px var(--wrong-glow);
    transform: translateY(-3px);
}

.btn-difficulty:active {
    transform: translateY(0);
}

/* ============ Event Count Picker ============ */
.event-count-picker {
    margin-top: 1.2rem;
    text-align: center;
}

.event-count-label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-body);
}

.event-count-label span {
    color: var(--accent);
    font-weight: 700;
    font-size: 1.1rem;
}

.event-count-slider {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: rgba(255, 255, 255, 0.1);
    outline: none;
    margin: 0.6rem 0 0.2rem;
}

.event-count-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(255, 137, 6, 0.4);
    transition: transform 0.15s ease;
}

.event-count-slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

.event-count-slider::-moz-range-thumb {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 8px rgba(255, 137, 6, 0.4);
}

.event-count-range {
    display: flex;
    justify-content: space-between;
    font-size: 0.7rem;
    color: var(--text-body);
    opacity: 0.4;
}

/* ============ Topic Categories ============ */
.custom-divider {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin: 1.2rem 0;
    color: var(--text-body);
    opacity: 0.4;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.custom-divider::before,
.custom-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--text-body);
    opacity: 0.3;
}

.category-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
}

.btn-category {
    padding: 0.6rem 0.8rem;
    border: 2px solid rgba(255, 255, 255, 0.08);
    border-radius: 10px;
    background: var(--bg-card-dark);
    color: var(--text-heading);
    font-family: var(--font-body);
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: center;
}

.btn-category:hover {
    border-color: #7c5cbf;
    box-shadow: 0 3px 16px rgba(124, 92, 191, 0.25);
    transform: translateY(-2px);
}

.btn-category:active {
    transform: translateY(0);
}

/* ============ Buttons ============ */
.btn-primary {
    font-family: var(--font-body);
    font-size: 1.1rem;
    font-weight: 700;
    padding: 1rem 3rem;
    border: none;
    border-radius: 50px;
    background: linear-gradient(135deg, var(--accent), #e07800);
    color: #fff;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    box-shadow: 0 4px 24px var(--accent-glow);
    letter-spacing: 0.03em;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 32px var(--accent-glow);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    font-family: var(--font-body);
    font-size: 0.95rem;
    font-weight: 600;
    padding: 0.7rem 2rem;
    border: 2px solid rgba(255, 255, 255, 0.15);
    border-radius: 50px;
    background: transparent;
    color: var(--text-body);
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-secondary:hover {
    border-color: rgba(255, 255, 255, 0.3);
    color: var(--text-heading);
    transform: translateY(-1px);
}

.gameover-buttons {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    align-items: center;
}

/* ============ Endless Mode Button ============ */
.btn-endless {
    width: 100%;
    padding: 0.9rem 1.2rem;
    border: 2px solid rgba(255, 255, 255, 0.08);
    border-radius: 14px;
    background: linear-gradient(135deg, #1a1a2e, #16213e);
    color: var(--text-heading);
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.25s ease;
    letter-spacing: 0.02em;
}

.btn-endless:hover {
    border-color: var(--accent);
    box-shadow: 0 4px 24px var(--accent-glow);
    transform: translateY(-2px);
}

.btn-endless:active {
    transform: translateY(0);
}

/* ============ Reset Events Button ============ */
.btn-reset-events {
    margin-top: 1rem;
    padding: 0.8rem 2rem;
    border: 2px solid var(--accent);
    border-radius: 50px;
    background: transparent;
    color: var(--accent);
    font-family: var(--font-body);
    font-size: 0.95rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s ease;
    animation: fadeInUp 0.4s ease;
}

.btn-reset-events:hover {
    background: var(--accent);
    color: #fff;
    transform: translateY(-1px);
}

.btn-reset-events.hidden {
    display: none;
}

/* ============ Loading Screen ============ */
.loading-content {
    text-align: center;
}

.hourglass-spinner {
    font-size: 4rem;
    animation: spin 2s ease-in-out infinite;
}

.loading-text {
    font-size: 1.2rem;
    margin-top: 1.5rem;
    color: var(--text-heading);
}

.loading-sub {
    font-size: 0.9rem;
    margin-top: 0.5rem;
    color: var(--text-body);
    opacity: 0.7;
}

/* ============ Game Screen ============ */
#screen-game {
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}

/* Header */
.game-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.header-left {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.header-score {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-body);
}

.header-score span {
    color: var(--accent);
    font-weight: 700;
}

.header-remaining {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-body);
}

.header-remaining span {
    color: var(--accent);
    font-weight: 700;
}

.header-title {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--accent);
    letter-spacing: 0.08em;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.btn-menu {
    width: 28px;
    height: 28px;
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 6px;
    background: transparent;
    color: var(--text-body);
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
}

.btn-menu:hover {
    border-color: rgba(255, 255, 255, 0.4);
    color: var(--text-heading);
}

.header-lives {
    display: flex;
    gap: 0.4rem;
}

.life {
    font-size: 1.3rem;
    transition: all 0.3s ease;
}

.life.lost {
    opacity: 0.2;
    filter: grayscale(1);
    transform: scale(0.8);
}

/* ============ Current Card Area ============ */
.current-card-area {
    display: flex;
    justify-content: center;
    padding: 1.2rem 1.5rem 0.5rem;
}

.event-card {
    background: var(--bg-card);
    border-radius: 16px;
    padding: 1.2rem 1.5rem;
    max-width: 500px;
    width: 100%;
    text-align: center;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    position: relative;
    overflow: hidden;
}

.event-card.mystery {
    border: 2px solid var(--accent);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3), 0 0 24px var(--accent-glow);
}

.card-label {
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 0.15em;
    color: var(--accent);
    margin-bottom: 0.6rem;
    text-transform: uppercase;
}

.card-text {
    font-size: 1rem;
    line-height: 1.5;
    color: var(--text-dark);
    font-weight: 500;
}

.card-year {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 900;
    color: var(--accent);
    margin-top: 0.6rem;
    letter-spacing: 0.1em;
}

/* ============ Read Clue Button ============ */
.btn-read-clue {
    position: absolute;
    bottom: 0.55rem;
    right: 0.75rem;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.05rem;
    line-height: 1;
    padding: 0.2rem 0.3rem;
    border-radius: 8px;
    opacity: 0.45;
    transition: opacity 0.15s ease, background 0.15s ease;
}

.btn-read-clue:hover {
    opacity: 1;
    background: rgba(255, 137, 6, 0.12);
}

.btn-read-clue.speaking {
    opacity: 1;
    animation: speakPulse 0.75s ease-in-out infinite;
}

@keyframes speakPulse {
    0%, 100% { transform: scale(1); }
    50%       { transform: scale(1.35); }
}

/* ============ Instruction ============ */
.instruction {
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-body);
    padding: 0.8rem 1.5rem 0.4rem;
    opacity: 0.7;
}

/* ============ Timeline ============ */
.timeline-wrapper {
    flex: 1;
    display: flex;
    align-items: center;
    overflow: hidden;
    padding: 0 1rem;
    position: relative;
}

.timeline-scroll {
    width: 100%;
    overflow-x: auto;
    overflow-y: hidden;
    padding: 2rem 0;
    position: relative;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
    scrollbar-color: var(--accent) transparent;
}

.timeline-scroll::-webkit-scrollbar {
    height: 4px;
}

.timeline-scroll::-webkit-scrollbar-track {
    background: transparent;
}

.timeline-scroll::-webkit-scrollbar-thumb {
    background: var(--accent);
    border-radius: 2px;
}

.timeline-line {
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, transparent, var(--timeline-line) 5%, var(--timeline-line) 95%, transparent);
    transform: translateY(-50%);
    pointer-events: none;
    z-index: 0;
}

.timeline-content {
    display: flex;
    align-items: center;
    min-width: max-content;
    padding: 0 2rem;
    position: relative;
    z-index: 1;
}

/* ============ Drop Zone ============ */
.drop-zone {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 52px;
    min-width: 52px;
    height: 140px;
    border: 2px dashed rgba(255, 137, 6, 0.25);
    border-radius: 12px;
    background: transparent;
    cursor: pointer;
    transition: all 0.25s ease;
    position: relative;
    flex-shrink: 0;
    font-family: inherit;
    -webkit-appearance: none;
    appearance: none;
}

.drop-zone::before {
    content: '';
    position: absolute;
    width: 12px;
    height: 12px;
    background: var(--accent);
    border-radius: 50%;
    opacity: 0.4;
    transition: all 0.25s ease;
}

.drop-icon {
    font-size: 1.5rem;
    color: var(--accent);
    opacity: 0.4;
    font-weight: 300;
    transition: all 0.25s ease;
}

.drop-zone:hover {
    border-color: var(--accent);
    background: rgba(255, 137, 6, 0.08);
    transform: scaleX(1.1);
    box-shadow: 0 0 20px var(--accent-glow);
}

.drop-zone:hover .drop-icon {
    opacity: 1;
    transform: scale(1.2);
}

.drop-zone:hover::before {
    opacity: 1;
    box-shadow: 0 0 10px var(--accent);
}

.drop-zone:active {
    transform: scaleX(0.95);
}

/* ============ Timeline Card ============ */
.timeline-card {
    background: var(--bg-card-dark);
    border-radius: 12px;
    padding: 1rem;
    width: 160px;
    min-width: 160px;
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.08);
    transition: all 0.3s ease;
    position: relative;
    flex-shrink: 0;
}

.timeline-card::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 10px;
    height: 10px;
    background: var(--timeline-line);
    border-radius: 50%;
}

.timeline-year {
    font-family: var(--font-display);
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 0.4rem;
}

.timeline-text {
    font-size: 0.75rem;
    color: var(--text-body);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Timeline card states */
.timeline-card.just-placed {
    animation: cardPop 0.5s ease;
}

.timeline-card.correct {
    border-color: var(--correct);
    box-shadow: 0 0 20px var(--correct-glow);
}

.timeline-card.wrong {
    border-color: var(--wrong);
    box-shadow: 0 0 20px var(--wrong-glow);
    animation: shake 0.5s ease;
}

/* ============ Feedback Toast ============ */
.feedback-toast {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.8);
    padding: 1rem 2rem;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 700;
    z-index: 100;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    pointer-events: none;
    text-align: center;
    max-width: 400px;
}

.feedback-toast.show {
    opacity: 1;
    visibility: visible;
    transform: translate(-50%, -50%) scale(1);
}

.feedback-toast.correct {
    background: var(--correct);
    color: #fff;
    box-shadow: 0 8px 32px var(--correct-glow);
}

.feedback-toast.wrong {
    background: var(--wrong);
    color: #fff;
    box-shadow: 0 8px 32px var(--wrong-glow);
}

/* ============ Game Over Screen ============ */
#screen-gameover {
    align-items: flex-start;
    justify-content: flex-start;
}

.gameover-content {
    text-align: center;
    padding: 2rem;
    max-width: 600px;
    width: 100%;
    margin: auto;
}

.gameover-icon {
    font-size: 4rem;
    margin-bottom: 0.5rem;
}

.gameover-title {
    font-family: var(--font-display);
    font-size: 3rem;
    font-weight: 900;
    color: var(--accent);
    margin-bottom: 0.5rem;
}

.gameover-message {
    font-size: 1rem;
    color: var(--text-body);
    margin-bottom: 1.5rem;
}

.final-score-display {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 2rem;
}

.final-score-number {
    font-family: var(--font-display);
    font-size: 5rem;
    font-weight: 900;
    color: var(--accent);
    line-height: 1;
}

.final-score-label {
    font-size: 0.9rem;
    color: var(--text-body);
    margin-top: 0.3rem;
}

/* Final Timeline */
.final-timeline-wrapper {
    width: 100%;
    overflow-x: auto;
    margin-bottom: 2rem;
    padding: 1rem 0;
    -webkit-overflow-scrolling: touch;
}

.final-timeline {
    display: flex;
    gap: 0.5rem;
    padding: 0.5rem;
    min-width: max-content;
    justify-content: center;
}

.final-timeline .mini-card {
    background: var(--bg-card-dark);
    border-radius: 8px;
    padding: 0.5rem 0.7rem;
    border: 1px solid rgba(255, 255, 255, 0.08);
    min-width: 80px;
}

.final-timeline .mini-card .mini-year {
    font-family: var(--font-display);
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--accent);
}

.final-timeline .mini-card .mini-text {
    font-size: 0.6rem;
    color: var(--text-body);
    line-height: 1.3;
    margin-top: 0.2rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* ============ Animations ============ */
@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    25% { transform: rotate(180deg); }
    50% { transform: rotate(180deg); }
    75% { transform: rotate(360deg); }
    100% { transform: rotate(360deg); }
}

@keyframes cardPop {
    0% { transform: scale(0.5); opacity: 0; }
    60% { transform: scale(1.08); }
    100% { transform: scale(1); opacity: 1; }
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    15% { transform: translateX(-8px); }
    30% { transform: translateX(8px); }
    45% { transform: translateX(-6px); }
    60% { transform: translateX(6px); }
    75% { transform: translateX(-3px); }
    90% { transform: translateX(3px); }
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ============ Dad Mode Toggle ============ */
.dad-mode-row {
    margin-top: 1.8rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.35rem;
    padding-bottom: 1rem;
}

.dad-toggle-label {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    user-select: none;
}

.dad-toggle-input {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.dad-toggle-switch {
    width: 50px;
    height: 28px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 14px;
    position: relative;
    transition: background 0.25s ease;
    flex-shrink: 0;
    border: 1px solid rgba(255,255,255,0.1);
}

.dad-toggle-switch::before {
    content: '';
    position: absolute;
    top: 4px;
    left: 4px;
    width: 20px;
    height: 20px;
    background: white;
    border-radius: 50%;
    transition: transform 0.25s ease;
    box-shadow: 0 1px 4px rgba(0,0,0,0.3);
}

.dad-toggle-input:checked + .dad-toggle-switch {
    background: var(--accent);
    border-color: var(--accent);
}

.dad-toggle-input:checked + .dad-toggle-switch::before {
    transform: translateX(22px);
}

.dad-toggle-text {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-heading);
}

.dad-toggle-hint {
    font-size: 0.75rem;
    color: var(--text-body);
    opacity: 0.6;
}

/* ============ Dad Mode — Current Card ============ */
body.dad-mode .event-card {
    padding: 1.5rem 2rem;
}

body.dad-mode .card-text {
    font-size: 1.2rem;
    line-height: 1.6;
}

body.dad-mode .card-label {
    font-size: 0.75rem;
    letter-spacing: 0.18em;
}

/* ============ Dad Mode — Hover Tooltip ============ */
.dad-tooltip {
    position: fixed;
    z-index: 999;
    pointer-events: none;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.15s ease, visibility 0.15s ease, transform 0.15s ease;
    transform: translateY(6px);
}

.dad-tooltip.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dad-tooltip-inner {
    background: var(--bg-card);
    border: 2px solid var(--accent);
    border-radius: 16px;
    padding: 1.2rem 1.4rem;
    width: 260px;
    text-align: center;
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.55), 0 0 28px var(--accent-glow);
}

.dad-tooltip-year {
    font-family: var(--font-display);
    font-size: 2.4rem;
    font-weight: 900;
    color: var(--accent);
    margin-bottom: 0.5rem;
    line-height: 1;
}

.dad-tooltip-text {
    font-size: 1rem;
    line-height: 1.55;
    color: var(--text-dark);
    font-weight: 500;
}

/* ============ Responsive ============ */
@media (max-width: 600px) {
    .title {
        font-size: 2.8rem;
    }

    .difficulty-buttons {
        gap: 0.5rem;
    }

    .btn-difficulty {
        min-width: 90px;
        padding: 0.8rem 0.8rem;
    }

    .btn-difficulty .diff-name {
        font-size: 0.9rem;
    }

    .event-card {
        padding: 1rem 1.2rem;
    }

    .card-text {
        font-size: 0.9rem;
    }

    .timeline-card {
        width: 130px;
        min-width: 130px;
        padding: 0.8rem;
    }

    .timeline-year {
        font-size: 1.2rem;
    }

    .drop-zone {
        width: 44px;
        min-width: 44px;
        height: 120px;
    }

    .gameover-title {
        font-size: 2.2rem;
    }

    .final-score-number {
        font-size: 3.5rem;
    }
}