:root {
    --bg-color: #0f172a;
    --surface-color: rgba(30, 41, 59, 0.7);
    --surface-hover: rgba(51, 65, 85, 0.8);
    --primary-color: #38bdf8;
    --secondary-color: #818cf8;
    --accent-color: #c084fc;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --success-color: #4ade80;
    --error-color: #f87171;
    --glass-border: 1px solid rgba(255, 255, 255, 0.1);
    --glass-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --radius-lg: 16px;
    --radius-md: 12px;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: 'Outfit', sans-serif;
    background-color: var(--bg-color);
    background-image:
        radial-gradient(at 0% 0%, rgba(56, 189, 248, 0.15) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(192, 132, 252, 0.15) 0px, transparent 50%);
    background-attachment: fixed;
    color: var(--text-primary);
    height: 100vh;
    overflow: hidden;
    /* Prevent scrolling for app-like feel on mobile */
}

/* Global Utilities */
.hidden {
    display: none !important;
}

/* Dataset Selector */
.dataset-selector {
    position: fixed;
    inset: 0;
    background:
        radial-gradient(900px 600px at 10% 10%, rgba(56, 189, 248, 0.12), transparent 60%),
        radial-gradient(900px 600px at 90% 90%, rgba(192, 132, 252, 0.12), transparent 60%),
        rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1500;
    padding: 1.5rem;
}

.selector-card {
    width: 100%;
    max-width: 860px;
    background: linear-gradient(135deg, rgba(30, 41, 59, 0.9), rgba(15, 23, 42, 0.9));
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 28px;
    padding: 2.75rem;
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.45);
    text-align: left;
}

.selector-card h1 {
    font-size: 2.4rem;
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
    background: linear-gradient(90deg, #e2e8f0, #94a3b8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.selector-card p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    font-size: 1rem;
}

.dataset-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.5rem;
}

.dataset-card {
    background: rgba(15, 23, 42, 0.7);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 20px;
    padding: 1.75rem;
    cursor: pointer;
    text-align: left;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    min-height: 180px;
    position: relative;
    overflow: hidden;
}

.dataset-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(56, 189, 248, 0.05), rgba(192, 132, 252, 0.05));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.dataset-card:hover::before {
    opacity: 1;
}

.dataset-card:not(.disabled):hover {
    transform: translateY(-4px) scale(1.02);
    border-color: rgba(56, 189, 248, 0.5);
    background: rgba(30, 41, 59, 0.8);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(56, 189, 248, 0.3);
}

.dataset-card.disabled {
    cursor: not-allowed;
    opacity: 0.8;
    background: rgba(15, 23, 42, 0.5);
}

.dataset-card.disabled:hover {
    transform: none;
    border-color: rgba(255, 255, 255, 0.08);
}

.dataset-card__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    position: relative;
    z-index: 1;
}

.dataset-title {
    font-weight: 700;
    font-size: 1.25rem;
    letter-spacing: -0.01em;
    line-height: 1.3;
    color: var(--text-primary);
}

.dataset-card:not(.disabled) .dataset-title {
    background: linear-gradient(135deg, var(--text-primary), var(--primary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.dataset-card.disabled .dataset-title {
    color: rgba(248, 250, 252, 0.8);
}

.dataset-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.5;
    flex: 1;
    position: relative;
    z-index: 1;
}

.dataset-card.disabled .dataset-desc {
    color: rgba(148, 163, 184, 0.7);
}

.dataset-badge {
    font-size: 0.7rem;
    font-weight: 700;
    padding: 0.3rem 0.65rem;
    border-radius: 999px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    border: 1px solid transparent;
    white-space: nowrap;
    position: relative;
    z-index: 1;
}

.dataset-badge.available {
    background: rgba(74, 222, 128, 0.2);
    color: #86efac;
    border-color: rgba(74, 222, 128, 0.4);
    box-shadow: 0 0 12px rgba(74, 222, 128, 0.3);
}

.dataset-badge.soon {
    background: rgba(148, 163, 184, 0.15);
    color: #cbd5e1;
    border-color: rgba(148, 163, 184, 0.3);
}

.dataset-cta {
    font-size: 0.9rem;
    font-weight: 600;
    margin-top: auto;
    padding: 0.5rem 0;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    position: relative;
    z-index: 1;
}

.dataset-cta.available {
    color: var(--primary-color);
}

.dataset-cta::after {
    content: '→';
    margin-left: 0.5rem;
    transition: transform 0.3s ease;
    display: inline-block;
}

.dataset-card:not(.disabled):hover .dataset-cta::after {
    transform: translateX(4px);
}

.dataset-cta.soon {
    color: var(--text-secondary);
}

.dataset-cta.soon::after {
    content: '🔒';
    margin-left: 0.5rem;
}

/* Achievements Modal */
.achievements-modal {
    width: 900px !important;
    max-width: 95% !important;
    max-height: 85vh;
    overflow-y: auto;
    text-align: left !important;
    padding: 2.5rem !important;
    display: flex;
    flex-direction: column;
}

.achievements-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 16px;
    margin-top: 1.5rem;
}

.achievement-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 12px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.3s ease;
}

.achievement-item.locked {
    filter: grayscale(1);
    opacity: 0.5;
}

.achievement-item .achievement-icon {
    font-size: 2rem;
    min-width: 44px;
    display: flex;
    justify-content: center;
}

.achievement-item .achievement-info {
    flex: 1;
}

.achievement-item .achievement-title {
    font-weight: 600;
    font-size: 1rem;
    color: var(--accent-color);
}

.achievement-item.locked .achievement-title {
    color: #888;
}

.achievement-item .achievement-desc {
    font-size: 0.85rem;
    color: #bbb;
    margin-top: 2px;
}

/* Toast Notification */
.achievement-toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(30, 41, 59, 0.95);
    backdrop-filter: blur(12px);
    border: 1px solid var(--accent-color);
    border-radius: 16px;
    padding: 16px 24px;
    display: flex;
    align-items: center;
    gap: 16px;
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.5);
    z-index: 2000;
    animation: toast-in 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.achievement-toast .toast-icon {
    font-size: 1.8rem;
}

.achievement-toast .toast-title {
    font-size: 0.75rem;
    color: var(--accent-color);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 700;
}

.achievement-toast .toast-name {
    font-size: 1.1rem;
    font-weight: 600;
    color: white;
}

@keyframes toast-in {
    from {
        transform: translate(-50%, 50px);
        opacity: 0;
    }

    to {
        transform: translate(-50%, 0);
        opacity: 1;
    }
}

.close-btn {
    position: absolute;
    top: 16px;
    right: 16px;
    background: none;
    border: none;
    color: white;
    font-size: 2rem;
    cursor: pointer;
    line-height: 1;
}

.close-btn:hover {
    color: var(--accent-color);
}

#app {
    display: flex;
    flex-direction: column;
    height: 100%;
    padding: 1rem;
    max-width: 600px;
    margin: 0 auto;
}

/* Header */
.game-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem 0 1rem 0;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.dataset-badge-header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--bg-color);
    font-size: 0.75rem;
    font-weight: 800;
    padding: 0.4rem 0.7rem;
    border-radius: 8px;
    letter-spacing: 0.05em;
    box-shadow: 0 2px 8px rgba(56, 189, 248, 0.4);
}

.level-indicator {
    display: flex;
    align-items: baseline;
    gap: 0.4rem;
    font-weight: 700;
}

.level-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.level-value {
    font-size: 1.4rem;
    font-weight: 800;
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

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

.stat-item {
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.stat-icon {
    font-size: 1.1rem;
    line-height: 1;
}

.stat-value {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
    min-width: 1.5rem;
    text-align: left;
}

.stat-record .stat-value {
    color: var(--accent-color);
}

.header-actions {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.action-btn {
    background: var(--surface-color);
    border: var(--glass-border);
    border-radius: 50%;
    width: 42px;
    height: 42px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    backdrop-filter: blur(8px);
    flex-shrink: 0;
}

.action-btn.disabled {
    opacity: 0.5;
    cursor: not-allowed;
    filter: grayscale(1);
}

.action-btn:not(.disabled):hover {
    background: var(--surface-hover);
    transform: scale(1.08);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.action-btn:not(.disabled):active {
    transform: scale(0.95);
}

.action-btn .icon {
    font-size: 1.3rem;
}

/* Main Game Board */
.game-board {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    overflow-y: auto;
    padding-bottom: 1rem;
}

.cities-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 1rem;
}

.city-card {
    background: var(--surface-color);
    border: var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 1rem;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    backdrop-filter: blur(12px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    min-height: 120px;
    box-shadow: var(--glass-shadow);
    user-select: none;
    position: relative;
}

.city-card.selected {
    border-color: var(--primary-color);
    background: rgba(56, 189, 248, 0.2);
    box-shadow: 0 0 15px rgba(56, 189, 248, 0.3);
    transform: translateY(-2px);
}

.city-card.revealed {
    border-color: var(--secondary-color);
}

.city-name {
    font-weight: 600;
    font-size: 1.1rem;
    margin-bottom: 0.25rem;
}

.city-district {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.city-stats {
    margin-top: 0.5rem;
    font-size: 0.75rem;
    color: var(--text-secondary);
    display: none;
    /* Hidden by default */
    text-align: left;
    width: 100%;
}

.city-stats div {
    display: flex;
    justify-content: space-between;
}

.properties-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    justify-content: center;
    /* Move properties to bottom visually if needed, but flex column handles flow */
}

.property-chip {
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--secondary-color);
    color: var(--text-primary);
    padding: 0.75rem 1.25rem;
    border-radius: 999px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    user-select: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.property-icon {
    font-size: 1.1rem;
}

.property-chip:hover {
    background: rgba(129, 140, 248, 0.2);
}

.property-chip.selected {
    background: var(--secondary-color);
    color: white;
    box-shadow: 0 0 10px rgba(129, 140, 248, 0.4);
}

/* Animations */
@keyframes shake {

    0%,
    100% {
        transform: translateX(0);
    }

    25% {
        transform: translateX(-5px);
    }

    75% {
        transform: translateX(5px);
    }
}

.shake {
    animation: shake 0.3s cubic-bezier(.36, .07, .19, .97) both;
}

.fade-out {
    opacity: 0;
    transform: scale(0.9);
    transition: all 0.3s ease;
}

/* Overlays */
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    backdrop-filter: blur(4px);
    transition: opacity 0.3s ease;
}

.overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.overlay-content {
    background: var(--bg-color);
    border: var(--glass-border);
    padding: 2rem;
    border-radius: var(--radius-lg);
    text-align: center;
    max-width: 90%;
    width: 320px;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

.overlay h2 {
    font-size: 1.8rem;
    margin-bottom: 0.5rem;
}

.primary-btn {
    margin-top: 1.5rem;
    background: var(--primary-color);
    color: #0f172a;
    border: none;
    padding: 0.75rem 2rem;
    border-radius: var(--radius-md);
    font-weight: 700;
    font-size: 1rem;
    cursor: pointer;
    width: 100%;
    transition: transform 0.1s;
}

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

.secondary-btn {
    margin-top: 0.5rem;
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--text-secondary);
    padding: 0.75rem 2rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    width: 100%;
    transition: all 0.2s;
}

.secondary-btn:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    border-color: var(--text-primary);
}


.button-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    width: 100%;
}

/* Mobile Optimizations */
@media (max-width: 500px),
(max-height: 750px) {
    .selector-card {
        padding: 1.5rem;
    }

    .selector-card h1 {
        font-size: 1.8rem;
    }

    #app {
        padding: 0.4rem;
    }

    .game-header {
        padding: 0.5rem 0 0.75rem 0;
        gap: 0.5rem;
        flex-wrap: wrap;
    }

    .header-left {
        gap: 0.5rem;
    }

    .dataset-badge-header {
        font-size: 0.7rem;
        padding: 0.35rem 0.6rem;
    }

    .level-value {
        font-size: 1.2rem;
    }

    .level-label {
        font-size: 0.75rem;
    }

    .header-stats {
        gap: 0.75rem;
        order: 3;
        width: 100%;
        justify-content: flex-start;
    }

    .stat-icon {
        font-size: 1rem;
    }

    .stat-value {
        font-size: 1.1rem;
    }

    .header-actions {
        gap: 0.4rem;
        margin-left: auto;
    }

    .action-btn {
        width: 40px;
        height: 40px;
    }

    .action-btn .icon {
        font-size: 1.2rem;
    }

    .game-board {
        gap: 1rem;
    }

    .cities-grid {
        gap: 0.75rem;
        grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
    }

    .city-card {
        padding: 0.75rem;
        min-height: 100px;
        border-radius: 14px;
    }

    .city-name {
        font-size: 1.1rem;
        margin-bottom: 0.2rem;
    }

    .city-district {
        font-size: 0.8rem;
    }

    .properties-list {
        gap: 0.6rem;
    }

    .property-chip {
        padding: 0.6rem 1rem;
        font-size: 0.85rem;
        gap: 0.4rem;
    }

    .property-icon {
        font-size: 1.1rem;
    }

    .achievements-modal {
        padding: 1.5rem !important;
    }

    .achievements-list {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .achievement-item {
        padding: 12px;
        gap: 14px;
    }
}