/* Modern Minimalist Crossword Trainer Styles */

:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --secondary-color: #64748b;
    --accent-color: #f59e0b;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --background-color: #f8fafc;
    --surface-color: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
}

* {
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--background-color);
    color: var(--text-primary);
    line-height: 1.6;
    margin: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Navigation */
.navbar {
    background-color: var(--surface-color);
    box-shadow: var(--shadow-sm);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--text-primary) !important;
    text-decoration: none;
    display: flex;
    align-items: center;
}

.navbar-brand i {
    color: var(--primary-color);
    font-size: 1.8rem;
}

.brand-text {
    margin-left: 0.5rem;
}

.nav-link {
    font-weight: 500;
    color: var(--text-secondary) !important;
    transition: color 0.2s ease;
    padding: 0.5rem 1rem !important;
    border-radius: 0.5rem;
}

.nav-link:hover {
    color: var(--primary-color) !important;
    background-color: var(--background-color);
}

.navbar-toggler {
    border: none;
    padding: 0.25rem 0.5rem;
}

.navbar-toggler:focus {
    box-shadow: none;
}

/* Main Content */
main {
    flex: 1;
    padding: 2rem 0;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* Cards */
.card {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.card-header {
    background-color: var(--background-color);
    border-bottom: 1px solid var(--border-color);
    padding: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.card-body {
    padding: 2rem;
}

/* Forms */
.form-control {
    border: 2px solid var(--border-color);
    border-radius: 0.75rem;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    background-color: var(--surface-color);
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgb(99 102 241 / 0.1);
    outline: none;
}

.form-label {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

/* Buttons */
.btn {
    border-radius: 0.75rem;
    font-weight: 600;
    padding: 0.75rem 1.5rem;
    border: none;
    transition: all 0.2s ease;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

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

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

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

.btn-secondary:hover {
    background-color: #475569;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

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

.btn-success:hover {
    background-color: #059669;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-outline {
    background-color: transparent;
    border: 2px solid var(--border-color);
    color: var(--text-secondary);
}

.btn-outline:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background-color: transparent;
}

/* Crossword Grid */
.crossword-grid {
    display: flex;
    justify-content: center;
    gap: 0.25rem;
    margin: 2rem 0;
    flex-wrap: wrap;
}

.letter-hint-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}

.crossword-input {
    width: 3rem;
    height: 3rem;
    border: 2px solid var(--border-color);
    border-radius: 0.5rem;
    text-align: center;
    font-size: 1.25rem;
    font-weight: 600;
    background-color: var(--surface-color);
    color: var(--text-primary);
    transition: all 0.2s ease;
    cursor: pointer;
    caret-color: transparent;
}

.hint-box {
    width: 3rem;
    height: 3rem;
    border: 2px solid var(--border-color);
    border-radius: 0.5rem;
    text-align: center;
    font-size: 1.25rem;
    font-weight: 600;
    background-color: var(--background-color);
    color: var(--text-secondary);
    transition: all 0.2s ease;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    user-select: none;
}

.hint-box:hover {
    border-color: var(--primary-color);
    background-color: var(--surface-color);
    color: var(--text-primary);
}

.hint-box.filled {
    background-color: var(--success-color);
    color: white;
    border-color: var(--success-color);
}

.crossword-input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgb(99 102 241 / 0.1);
    outline: none;
    background-color: rgba(99, 102, 241, 0.1);
    border-bottom: 4px solid var(--primary-color);
}

.crossword-input:disabled {
    background-color: var(--background-color);
    color: var(--text-secondary);
    cursor: not-allowed;
}

/* Clue Display */
.clue-container {
    background-color: var(--surface-color);
    border-radius: 1rem;
    padding: 2rem;
    margin: 2rem 0;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
}

.clue-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}

.clue-text {
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--text-primary);
    line-height: 1.5;
    margin-bottom: 0;
}

.answer-container {
    background-color: var(--background-color);
    border-radius: 0.75rem;
    padding: 1.5rem;
    margin: 1.5rem 0;
    border-left: 4px solid var(--success-color);
}

.answer-text {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--success-color);
    margin-bottom: 1rem;
}

.explanation-text {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 0;
}

/* Action Buttons */
.action-buttons {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    justify-content: center;
    align-items: center;
    margin: 2rem 0;
}

/* Tables */
.table {
    background-color: var(--surface-color);
    border-radius: 1rem;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
}

.table th {
    background-color: var(--background-color);
    border-bottom: 1px solid var(--border-color);
    font-weight: 600;
    color: var(--text-primary);
    padding: 0.5rem 0.25rem;
}

.table td {
    border-bottom: 1px solid var(--border-color);
    padding: 0.5rem 0.25rem;
    color: var(--text-secondary);
}

.table tbody tr:hover {
    background-color: var(--background-color);
}

/* History table specific styles */
.table th {
    white-space: nowrap;
}

.table td {
    word-wrap: break-word;
    max-width: 0;
}

/* Alerts */
.alert {
    border-radius: 0.75rem;
    border: none;
    padding: 1rem 1.5rem;
}

.alert-info {
    background-color: rgb(59 130 246 / 0.1);
    color: #1d4ed8;
}

.alert-success {
    background-color: rgb(34 197 94 / 0.1);
    color: #15803d;
}

.alert-danger {
    background-color: rgb(239 68 68 / 0.1);
    color: #dc2626;
}

/* Footer */
.footer {
    background-color: var(--surface-color);
    border-top: 1px solid var(--border-color);
    margin-top: auto;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 0.75rem;
    }
    
    .card-body {
        padding: 1.5rem;
    }
    
    .crossword-input {
        width: 2.5rem;
        height: 2.5rem;
        font-size: 1rem;
    }
    
    .action-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 300px;
    }
}

/* Badges */
.badge {
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.375rem 0.75rem;
    border-radius: 0.5rem;
}

.bg-primary {
    background-color: var(--primary-color) !important;
}

.bg-secondary {
    background-color: var(--secondary-color) !important;
}

.bg-success {
    background-color: var(--success-color) !important;
}

.bg-danger {
    background-color: var(--danger-color) !important;
}

.bg-warning {
    background-color: var(--accent-color) !important;
}

/* Utility Classes */
.text-center {
    text-align: center;
}

.text-muted {
    color: var(--text-secondary) !important;
}

.text-danger {
    color: var(--danger-color) !important;
}

.text-warning {
    color: var(--accent-color) !important;
}

.mb-0 {
    margin-bottom: 0;
}

.mt-2 {
    margin-top: 0.5rem;
}

.mt-3 {
    margin-top: 1rem;
}

.mt-4 {
    margin-top: 1.5rem;
}

.mb-3 {
    margin-bottom: 1rem;
}

.mb-4 {
    margin-bottom: 1.5rem;
}

.mb-5 {
    margin-bottom: 3rem;
}

.p-0 {
    padding: 0;
}

.p-4 {
    padding: 1.5rem;
}

.py-5 {
    padding-top: 3rem;
    padding-bottom: 3rem;
}

.me-1 {
    margin-right: 0.25rem;
}

.me-2 {
    margin-right: 0.5rem;
}

.ms-auto {
    margin-left: auto;
}

.d-grid {
    display: grid;
}

.gap-2 {
    gap: 0.5rem;
}

.text-decoration-none {
    text-decoration: none;
}

.table-responsive {
    overflow-x: auto;
}

.fa-3x {
    font-size: 3rem;
}

.fa-4x {
    font-size: 4rem;
}

.align-middle {
    vertical-align: middle !important;
}

/* Loading States */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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