/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --secondary-hover: #475569;
    --background: #f8fafc;
    --surface: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border: #e2e8f0;
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    --border-radius: 8px;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1),
        0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

body {
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
header {
    text-align: center;
    padding: 40px 0;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 8px;
}

header p {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

/* Main content */
main {
    flex: 1;
    padding-bottom: 40px;
}

.game-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: start;
}

.grid-container,
.results-container {
    background: var(--surface);
    border-radius: var(--border-radius);
    padding: 30px;
    box-shadow: var(--shadow);
}

.grid-container h2,
.results-container h2 {
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: var(--text-primary);
}

/* Letter grid - 5x4 layout with extra slots in first column */
.letter-grid {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 30px;
    padding: 8px;
    justify-content: center;
    align-items: center;
}

.letter-grid-5x4 {
    display: grid;
    gap: 16px;
    justify-content: center;
}

/* Layout when no extra slots are visible - centered 4x4 grid */
.letter-grid-5x4.no-extra-slots {
    grid-template-columns: repeat(4, 60px);
    grid-template-rows: repeat(4, 60px);
}

/* Layout when extra slots are visible - 5x4 grid */
.letter-grid-5x4.has-extra-slots {
    grid-template-columns: 60px repeat(4, 60px);
    grid-template-rows: repeat(4, 60px);
}

/* Position inputs in 5x4 grid with left-to-right, top-to-bottom indexing */
/* When extra slots are visible, use 5-column positioning */
.letter-grid-5x4.has-extra-slots .letter-input[data-index="0"] { grid-column: 1; grid-row: 1; }
.letter-grid-5x4.has-extra-slots .letter-input[data-index="1"] { grid-column: 2; grid-row: 1; }
.letter-grid-5x4.has-extra-slots .letter-input[data-index="2"] { grid-column: 3; grid-row: 1; }
.letter-grid-5x4.has-extra-slots .letter-input[data-index="3"] { grid-column: 4; grid-row: 1; }
.letter-grid-5x4.has-extra-slots .letter-input[data-index="4"] { grid-column: 5; grid-row: 1; }

.letter-grid-5x4.has-extra-slots .letter-input[data-index="5"] { grid-column: 1; grid-row: 2; }
.letter-grid-5x4.has-extra-slots .letter-input[data-index="6"] { grid-column: 2; grid-row: 2; }
.letter-grid-5x4.has-extra-slots .letter-input[data-index="7"] { grid-column: 3; grid-row: 2; }
.letter-grid-5x4.has-extra-slots .letter-input[data-index="8"] { grid-column: 4; grid-row: 2; }
.letter-grid-5x4.has-extra-slots .letter-input[data-index="9"] { grid-column: 5; grid-row: 2; }

.letter-grid-5x4.has-extra-slots .letter-input[data-index="10"] { grid-column: 1; grid-row: 3; }
.letter-grid-5x4.has-extra-slots .letter-input[data-index="11"] { grid-column: 2; grid-row: 3; }
.letter-grid-5x4.has-extra-slots .letter-input[data-index="12"] { grid-column: 3; grid-row: 3; }
.letter-grid-5x4.has-extra-slots .letter-input[data-index="13"] { grid-column: 4; grid-row: 3; }
.letter-grid-5x4.has-extra-slots .letter-input[data-index="14"] { grid-column: 5; grid-row: 3; }

.letter-grid-5x4.has-extra-slots .letter-input[data-index="15"] { grid-column: 1; grid-row: 4; }
.letter-grid-5x4.has-extra-slots .letter-input[data-index="16"] { grid-column: 2; grid-row: 4; }
.letter-grid-5x4.has-extra-slots .letter-input[data-index="17"] { grid-column: 3; grid-row: 4; }
.letter-grid-5x4.has-extra-slots .letter-input[data-index="18"] { grid-column: 4; grid-row: 4; }
.letter-grid-5x4.has-extra-slots .letter-input[data-index="19"] { grid-column: 5; grid-row: 4; }

/* When no extra slots are visible, use 4-column positioning for main grid only */
.letter-grid-5x4.no-extra-slots .letter-input[data-index="1"] { grid-column: 1; grid-row: 1; }
.letter-grid-5x4.no-extra-slots .letter-input[data-index="2"] { grid-column: 2; grid-row: 1; }
.letter-grid-5x4.no-extra-slots .letter-input[data-index="3"] { grid-column: 3; grid-row: 1; }
.letter-grid-5x4.no-extra-slots .letter-input[data-index="4"] { grid-column: 4; grid-row: 1; }

.letter-grid-5x4.no-extra-slots .letter-input[data-index="6"] { grid-column: 1; grid-row: 2; }
.letter-grid-5x4.no-extra-slots .letter-input[data-index="7"] { grid-column: 2; grid-row: 2; }
.letter-grid-5x4.no-extra-slots .letter-input[data-index="8"] { grid-column: 3; grid-row: 2; }
.letter-grid-5x4.no-extra-slots .letter-input[data-index="9"] { grid-column: 4; grid-row: 2; }

.letter-grid-5x4.no-extra-slots .letter-input[data-index="11"] { grid-column: 1; grid-row: 3; }
.letter-grid-5x4.no-extra-slots .letter-input[data-index="12"] { grid-column: 2; grid-row: 3; }
.letter-grid-5x4.no-extra-slots .letter-input[data-index="13"] { grid-column: 3; grid-row: 3; }
.letter-grid-5x4.no-extra-slots .letter-input[data-index="14"] { grid-column: 4; grid-row: 3; }

.letter-grid-5x4.no-extra-slots .letter-input[data-index="16"] { grid-column: 1; grid-row: 4; }
.letter-grid-5x4.no-extra-slots .letter-input[data-index="17"] { grid-column: 2; grid-row: 4; }
.letter-grid-5x4.no-extra-slots .letter-input[data-index="18"] { grid-column: 3; grid-row: 4; }
.letter-grid-5x4.no-extra-slots .letter-input[data-index="19"] { grid-column: 4; grid-row: 4; }

/* Style for extra slots */
.letter-input.extra-slot {
    border-color: var(--warning);
    background-color: rgba(245, 158, 11, 0.1);
}

.letter-input.extra-slot:focus {
    border-color: var(--warning);
    box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.1);
}

/* General letter input styles */
.letter-input {
    width: 60px;
    height: 60px;
    border: 2px solid var(--border);
    border-radius: var(--border-radius);
    font-size: 1.5rem;
    font-weight: 600;
    text-align: center;
    text-transform: uppercase;
    background: var(--surface);
    color: var(--text-primary);
    transition: all 0.2s ease;
}

.letter-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.letter-input:hover {
    border-color: var(--primary-hover);
}

/* Extra slots control */
.extra-slots-control {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-top: 20px;
}

.extra-slots-control label {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.extra-slots-select {
    padding: 8px 16px;
    border: 2px solid var(--border);
    border-radius: var(--border-radius);
    font-size: 1rem;
    background: var(--surface);
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.2s ease;
}

.extra-slots-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.extra-slots-select:hover {
    border-color: var(--primary-hover);
}

/* Remove old grid styles */
.main-grid {
    display: none;
}

.extra-slots {
    display: none;
}

.extra-slots.hidden {
    display: none;
}

/* Controls */
.controls {
    display: flex;
    gap: 12px;
    justify-content: center;
}



.btn-primary,
.btn-secondary {
    padding: 12px 24px;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 8px;
}

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

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: var(--secondary-color);
    color: white;
}

.btn-secondary:hover {
    background: var(--secondary-hover);
    transform: translateY(-1px);
}

.btn-primary:disabled,
.btn-secondary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* Loading spinner */
.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 40px 0;
}

.spinner {
    width: 24px;
    height: 24px;
    border: 3px solid var(--border);
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Stats */
.stats {
    margin-bottom: 20px;
    padding: 16px;
    background: var(--background);
    border-radius: var(--border-radius);
    border: 1px solid var(--border);
}

.stats p {
    margin: 0;
    font-weight: 600;
    color: var(--text-secondary);
}

/* Word list */
.word-list {
    max-height: 600px;
    overflow-y: auto;
}

.word-group {
    margin-bottom: 24px;
    position: relative;
}

.word-group h3 {
    font-size: 1.2rem;
    color: var(--primary-color);
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--border);
    display: flex;
    align-items: center;
    gap: 8px;
}

.word-group-header {
    font-size: 1.2rem;
    color: var(--primary-color);
    margin-bottom: 12px;
    padding: 8px 12px;
    border-bottom: 2px solid var(--border);
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    user-select: none;
    border-radius: var(--border-radius);
    transition: all 0.2s ease;
    position: sticky;
    top: 0;
    background: var(--surface);
    z-index: 10;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.word-group-header:hover {
    background-color: var(--background);
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

.word-group-header:focus {
    outline: none;
    background-color: var(--background);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1), 0 2px 4px rgba(0, 0, 0, 0.1);
}

.word-group-header.collapsed {
    margin-bottom: 0;
    border-bottom-color: transparent;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.collapse-icon {
    font-size: 0.9em;
    transition: transform 0.2s ease;
    min-width: 16px;
    text-align: center;
}

.word-count {
    font-size: 0.9rem;
    background: var(--primary-color);
    color: white;
    padding: 2px 8px;
    border-radius: 12px;
    font-weight: 500;
}

.words {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 8px;
    transition: all 0.3s ease;
    overflow: hidden;
}

.word {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    padding: 8px 12px;
    font-weight: 500;
    text-align: center;
    transition: all 0.2s ease;
}

.word:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

.placeholder {
    text-align: center;
    color: var(--text-secondary);
    font-style: italic;
    padding: 40px 0;
}

/* Filters Section */
.filters-section {
    margin-bottom: 15px;
    padding: 12px 16px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.filters-section h3 {
    margin-bottom: 8px;
    color: var(--text-primary);
    font-size: 1rem;
}

.filter-controls {
    display: grid;
    grid-template-columns: auto 1fr auto 1fr;
    gap: 8px 12px;
    align-items: center;
}

.filter-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
    white-space: nowrap;
    text-align: right;
}

.filter-input {
    padding: 6px 8px;
    border: 1px solid var(--border);
    border-radius: 4px;
    font-size: 0.85rem;
    background: var(--surface);
    color: var(--text-primary);
    transition: border-color 0.2s, box-shadow 0.2s;
    width: 100%;
}

.filter-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.filter-input::placeholder {
    color: var(--text-secondary);
}

/* Footer */
footer {
    text-align: center;
    padding: 30px 0;
    border-top: 1px solid var(--border);
    color: var(--text-secondary);
}

/* Responsive design */
@media (max-width: 768px) {
    .container {
        padding: 0 16px;
    }

    header h1 {
        font-size: 2rem;
    }

    .game-section {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .grid-container,
    .results-container {
        padding: 20px;
    }

    .letter-grid-5x4 {
        gap: 12px;
    }

    .letter-grid-5x4.no-extra-slots {
        grid-template-columns: repeat(4, 50px);
        grid-template-rows: repeat(4, 50px);
    }

    .letter-grid-5x4.has-extra-slots {
        grid-template-columns: 50px repeat(4, 50px);
        grid-template-rows: repeat(4, 50px);
    }

    .letter-input {
        width: 50px;
        height: 50px;
        font-size: 1.2rem;
    }

    .controls {
        flex-direction: column;
    }

    .words {
        grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    }

    .filter-controls {
        grid-template-columns: 1fr;
        gap: 8px;
    }

    .filter-label {
        text-align: left;
    }
}

/* Scrollbar styling */
.word-list::-webkit-scrollbar {
    width: 8px;
}

.word-list::-webkit-scrollbar-track {
    background: var(--background);
    border-radius: 4px;
}

.word-list::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
}

.word-list::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-color);
}

/* Compact special tiles */
.special-tiles-section {
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid var(--border);
}

.special-tiles-title {
    font-size: 13px;
    color: var(--text-secondary);
    margin: 0 0 8px 0;
    font-weight: 500;
}

.special-tiles-compact {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.special-tile-compact {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    color: var(--text-secondary);
}

.special-tile-compact.coming-soon {
    opacity: 0.5;
}

.special-tile-compact code {
    background: var(--primary-color);
    color: white;
    padding: 2px 6px;
    border-radius: 3px;
    font-size: 11px;
    font-weight: bold;
}

.special-tile-compact.coming-soon code {
    background: var(--secondary-color);
}