:root {
    /* Color Palette - Premium Dark Mode */
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-card: #334155;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-primary: #38bdf8;
    /* Sky Blue */
    --accent-secondary: #818cf8;
    /* Indigo */
    --success: #4ade80;
    --danger: #f87171;
    --warning: #fbbf24;

    /* Typography */
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;

    /* Borders */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-full: 9999px;
}

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

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

a {
    color: inherit;
    text-decoration: none;
}

/* Layout */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Header */
.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid var(--bg-secondary);
    margin-bottom: var(--spacing-lg);
}

.brand {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(to right, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Sections */
.section {
    margin-bottom: var(--spacing-xl);
}

.section-header {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
    border-left: 4px solid var(--accent-primary);
    padding-left: var(--spacing-sm);
}

/* Carousel (Horizontal Scroll) */
.carousel {
    display: flex;
    overflow-x: auto;
    gap: var(--spacing-md);
    padding-bottom: var(--spacing-md);
    scrollbar-width: thin;
    scrollbar-color: var(--bg-card) var(--bg-primary);
}

.carousel::-webkit-scrollbar {
    height: 8px;
}

.carousel::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

.carousel::-webkit-scrollbar-thumb {
    background-color: var(--bg-card);
    border-radius: var(--radius-full);
}

/* Cards */
.card {
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: transform 0.2s, box-shadow 0.2s;
    position: relative;
    flex-shrink: 0;
    width: 280px;
    /* Fixed width for carousel items */
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

.card-image {
    height: 160px;
    background-color: var(--bg-card);
    background-size: cover;
    background-position: center;
    position: relative;
}

.card-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: var(--spacing-md);
    background: linear-gradient(to top, rgba(15, 23, 42, 0.9), transparent);
}

.card-content {
    padding: var(--spacing-md);
}

.card-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.card-subtitle {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.badge {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    background-color: rgba(56, 189, 248, 0.1);
    color: var(--accent-primary);
    margin-bottom: var(--spacing-xs);
}

.stats-row {
    display: flex;
    gap: var(--spacing-md);
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: var(--spacing-sm);
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.streak-info {
    margin-top: var(--spacing-sm);
    padding-top: var(--spacing-sm);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.875rem;
    color: var(--accent-secondary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Grid Layout for "Packs" section */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.grid .card {
    width: 100%;
    /* Full width in grid */
}

/* New Indicator */
.new-indicator {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    width: 10px;
    height: 10px;
    background-color: var(--accent-primary);
    border-radius: 50%;
    box-shadow: 0 0 0 2px var(--bg-secondary);
}

/* Puzzle Page Styles */
.puzzle-container {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-md);
    text-align: center;
}

/* Lives */
.lives-container {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    font-size: 1.5rem;
}

.heart {
    color: var(--danger);
    transition: transform 0.2s;
}

.heart.lost {
    opacity: 0.3;
    filter: grayscale(100%);
}

/* Game Board */
.game-board {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-lg);
    /* Word spacing */
    margin-bottom: var(--spacing-xl);
}

.word-container {
    display: flex;
    gap: var(--spacing-xs);
    /* Letter spacing */
}

.puzzle-letter {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 50px;
    background-color: var(--bg-card);
    border: 2px solid var(--bg-secondary);
    border-radius: var(--radius-sm);
    font-size: 1.5rem;
    font-weight: 700;
    text-transform: uppercase;
    color: var(--text-primary);
    transition: all 0.3s ease;
    perspective: 1000px;
}

.puzzle-letter.revealed {
    background-color: var(--accent-primary);
    color: var(--bg-primary);
    border-color: var(--accent-primary);
    animation: flip 0.6s ease forwards;
}

@keyframes flip {
    0% {
        transform: rotateY(0);
    }

    100% {
        transform: rotateY(360deg);
    }
}

/* Hints */
.hints-section {
    margin-bottom: var(--spacing-xl);
    background-color: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
}

.hints-tabs {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
}

.hint-tab {
    background-color: var(--bg-card);
    border: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: background-color 0.2s;
}

.hint-tab:hover {
    background-color: var(--bg-primary);
}

.hint-tab.active {
    background-color: var(--accent-secondary);
    color: white;
}

.hint-cost {
    background-color: rgba(0, 0, 0, 0.2);
    padding: 2px 6px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
}

.hint-content {
    padding: var(--spacing-md);
    background-color: var(--bg-card);
    border-radius: var(--radius-sm);
    min-height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Keyboard */
.keyboard {
    margin-top: var(--spacing-xl);
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-sm);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.key {
    width: 40px;
    height: 50px;
    background-color: var(--bg-card);
    border: none;
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 1.25rem;
    cursor: pointer;
    transition: background-color 0.2s;
}

.key:hover:not(:disabled) {
    background-color: var(--bg-secondary);
}

.key:disabled {
    cursor: not-allowed;
    opacity: 0.7;
}

.key.correct {
    background-color: var(--success);
    color: var(--bg-primary);
}

.key.wrong {
    background-color: var(--danger);
    color: white;
}

.key.used {
    background-color: var(--bg-secondary);
    color: var(--text-secondary);
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    backdrop-filter: blur(5px);
}

.modal-content {
    background-color: var(--bg-secondary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    max-width: 500px;
    width: 90%;
    text-align: center;
    border: 1px solid var(--bg-card);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

.result-emoji {
    font-size: 4rem;
    margin: var(--spacing-md) 0;
}

.revealed-answer {
    font-family: monospace;
    font-size: 1.5rem;
    letter-spacing: 2px;
    margin-bottom: var(--spacing-md);
    color: var(--accent-primary);
}

.blur-text {
    filter: blur(5px);
    transition: filter 0.3s;
    user-select: none;
}

.blur-text.revealed {
    filter: blur(0);
}

.modal-actions {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.modal-actions .row {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
}

button {
    cursor: pointer;
}

.btn-primary,
.btn-secondary {
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    border: none;
    font-weight: 600;
    text-decoration: none;
    display: inline-block;
}

.btn-primary {
    background-color: var(--accent-primary);
    color: var(--bg-primary);
}

.btn-secondary {
    background-color: var(--bg-card);
    color: var(--text-primary);
}

.icon-btn {
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.25rem;
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
}

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