/* ===== STYLES COMMUNS - Application Sudoku ===== */
/* Fichier centralisé pour éviter les duplications */

/* Import de la police Google Fonts (une seule fois) */
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700&display=swap');

/* ===== VARIABLES CSS (DESIGN TOKENS) ===== */
:root {
    /* Couleurs principales */
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --accent-color: #10b981;
    
    /* Couleurs de fond */
    --background-light: #f8fafc;
    --background-dark: #0f172a;
    
    /* Couleurs des cartes */
    --card-light: #ffffff;
    --card-dark: #1e293b;
    
    /* Couleurs de texte */
    --text-light: #1e293b;
    --text-dark: #f1f5f9;
    
    /* Couleurs de bordure */
    --border-light: #e2e8f0;
    --border-dark: #334155;
    
    /* Ombres */
    --shadow-light: 0 10px 25px -5px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-dark: 0 10px 25px -5px rgba(0, 0, 0, 0.3), 0 4px 6px -2px rgba(0, 0, 0, 0.2);
    
    /* Couleurs d'état */
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    --info-color: #3b82f6;
    
    /* Espacements */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Rayons de bordure */
    --border-radius-sm: 6px;
    --border-radius-md: 8px;
    --border-radius-lg: 12px;
    --border-radius-xl: 16px;
    --border-radius-2xl: 20px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Z-index */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
}

/* ===== RÉINITIALISATION ET STYLES DE BASE ===== */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    line-height: 1.5;
    -webkit-text-size-adjust: 100%;
    -ms-text-size-adjust: 100%;
}

body {
    font-family: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 1rem;
    font-weight: 400;
    line-height: 1.6;
    color: var(--text-light);
    background: linear-gradient(135deg, var(--background-light) 0%, #e2e8f0 100%);
    background-attachment: fixed;
    transition: all var(--transition-normal);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===== THÈME SOMBRE ===== */
body.dark {
    color: var(--text-dark);
    background: linear-gradient(135deg, var(--background-dark) 0%, #1e293b 100%);
}

/* ===== TYPOGRAPHIE ===== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

/* ===== LIENS ===== */
a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--primary-hover);
}

/* ===== BOUTONS ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 0.9rem;
    font-weight: 600;
    border: none;
    border-radius: var(--border-radius-lg);
    cursor: pointer;
    transition: all var(--transition-normal);
    font-family: inherit;
    text-decoration: none;
    min-height: 44px; /* Accessibilité */
}

.btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.3);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

/* Variantes de boutons */
.btn--primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    color: white;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.2);
}

.btn--primary:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--primary-hover), #1d4ed8);
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(59, 130, 246, 0.3);
}

.btn--secondary {
    background: linear-gradient(135deg, #6b7280, #4b5563);
    color: white;
    box-shadow: 0 4px 12px rgba(107, 114, 128, 0.2);
}

.btn--secondary:hover:not(:disabled) {
    background: linear-gradient(135deg, #4b5563, #374151);
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(107, 114, 128, 0.3);
}

.btn--accent {
    background: linear-gradient(135deg, var(--accent-color), #059669);
    color: white;
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.2);
}

.btn--accent:hover:not(:disabled) {
    background: linear-gradient(135deg, #059669, #047857);
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(16, 185, 129, 0.3);
}

.btn--danger {
    background: linear-gradient(135deg, var(--error-color), #dc2626);
    color: white;
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.3);
}

.btn--danger:hover:not(:disabled) {
    background: linear-gradient(135deg, #dc2626, #b91c1c);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(239, 68, 68, 0.4);
}

/* ===== FORMULAIRES ===== */
input, select, textarea {
    font-family: inherit;
    font-size: 1rem;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--border-light);
    border-radius: var(--border-radius-md);
    background: var(--card-light);
    color: var(--text-light);
    transition: all var(--transition-fast);
}

body.dark input,
body.dark select,
body.dark textarea {
    background: var(--card-dark);
    border-color: var(--border-dark);
    color: var(--text-dark);
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* ===== CARTES ===== */
.card {
    background: var(--card-light);
    border-radius: var(--border-radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-light);
    border: 1px solid var(--border-light);
    transition: all var(--transition-normal);
}

body.dark .card {
    background: var(--card-dark);
    box-shadow: var(--shadow-dark);
    border-color: var(--border-dark);
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 20px 40px -10px rgba(0, 0, 0, 0.15);
}

/* ===== ANIMATIONS ===== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideOutRight {
    from {
        opacity: 1;
        transform: translateX(0);
    }
    to {
        opacity: 0;
        transform: translateX(100%);
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

/* ===== UTILITAIRES ===== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }
.mb-5 { margin-bottom: var(--spacing-xl); }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }
.mt-5 { margin-top: var(--spacing-xl); }

.p-0 { padding: 0; }
.p-1 { padding: var(--spacing-xs); }
.p-2 { padding: var(--spacing-sm); }
.p-3 { padding: var(--spacing-md); }
.p-4 { padding: var(--spacing-lg); }
.p-5 { padding: var(--spacing-xl); }

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    html {
        font-size: 14px;
    }
    
    .card {
        padding: var(--spacing-lg);
    }
    
    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
    h3 { font-size: 1.5rem; }
}

@media (max-width: 480px) {
    html {
        font-size: 13px;
    }
    
    .card {
        padding: var(--spacing-md);
    }
    
    .btn {
        padding: var(--spacing-md) var(--spacing-lg);
        min-height: 48px; /* Touch-friendly */
    }
}

/* ===== ACCESSIBILITÉ ===== */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Focus visible pour la navigation clavier */
*:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* ===== PRINT ===== */
@media print {
    * {
        background: transparent !important;
        color: black !important;
        box-shadow: none !important;
        text-shadow: none !important;
    }
    
    .card {
        border: 1px solid #ccc;
        box-shadow: none;
    }
}