/* ============================================
   SYSTÈME DE STYLES COHÉRENT - ELBIOMETRIA
   ============================================ */

:root {
    /* Couleurs principales */
    --primary-blue: #4285F4;
    --primary-dark: #2D5AA0;
    --text-dark: #3c4043;
    --text-light: #5f6368;
    --text-muted: #80868b;
    --border-color: #dadce0;
    --bg-light: #f8f9fa;
    --white: #ffffff;
    --error: #d93025;
    --success: #1e9e6d;
    
    /* Espacements */
    --spacing-xs: 8px;
    --spacing-sm: 12px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    /* Border radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    
    /* Ombres */
    --shadow-sm: 0 1px 2px 0 rgba(60, 64, 67, .3), 0 1px 3px 1px rgba(60, 64, 67, .15);
    --shadow-md: 0 1px 3px 0 rgba(60, 64, 67, .3), 0 4px 8px 3px rgba(60, 64, 67, .15);
    --shadow-lg: 0 2px 6px 2px rgba(60, 64, 67, .15), 0 8px 24px 4px rgba(60, 64, 67, .15);
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 250ms ease-in-out;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-dark);
    line-height: 1.6;
}

/* ============================================
   LAYOUT PRINCIPAL
   ============================================ */

.auth-container {
    width: 100%;
    max-width: 450px;
    padding: var(--spacing-lg);
}

.auth-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-xl) var(--spacing-xl);
    text-align: center;
}

/* ============================================
   LOGO ET HEADER
   ============================================ */

.auth-logo {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-md);
}

.auth-logo img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.auth-brand {
    font-size: 24px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: var(--spacing-xs);
}

.auth-subtitle {
    font-size: 14px;
    color: var(--text-light);
    margin-bottom: var(--spacing-xl);
}

.auth-heading {
    font-size: 20px;
    font-weight: 500;
    color: var(--text-dark);
    margin-bottom: var(--spacing-xs);
    text-align: left;
}

.auth-subheading {
    font-size: 14px;
    color: var(--text-light);
    margin-bottom: var(--spacing-lg);
    text-align: left;
}

/* ============================================
   FORMULAIRE
   ============================================ */

.auth-form {
    width: 100%;
}

.form-group {
    margin-bottom: var(--spacing-lg);
    text-align: left;
}

.form-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 14px;
    font-weight: 500;
    color: var(--text-dark);
    margin-bottom: var(--spacing-xs);
}

.form-label-icon {
    width: 16px;
    height: 16px;
    color: var(--primary-blue);
}

.form-input-wrapper {
    position: relative;
}

.form-input {
    width: 100%;
    padding: 12px 16px;
    font-size: 14px;
    color: var(--text-dark);
    background: var(--white);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    outline: none;
    transition: all var(--transition-fast);
}

.form-input:focus {
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(66, 133, 244, 0.1);
}

.form-input::placeholder {
    color: var(--text-muted);
}

.form-input.error {
    border-color: var(--error);
}

.form-input.error:focus {
    box-shadow: 0 0 0 3px rgba(217, 48, 37, 0.1);
}

/* Input avec icône de toggle password */
.form-input-password {
    padding-right: 45px;
}

.toggle-password {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    color: var(--text-muted);
    transition: color var(--transition-fast);
}

.toggle-password:hover {
    color: var(--text-dark);
}

.toggle-password svg {
    width: 20px;
    height: 20px;
}

/* ============================================
   CHECKBOX & OPTIONS
   ============================================ */

.form-options {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-lg);
    font-size: 14px;
}

.form-checkbox-wrapper {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.form-checkbox {
    width: 16px;
    height: 16px;
    cursor: pointer;
    accent-color: var(--primary-blue);
}

.form-checkbox-label {
    color: var(--text-light);
    cursor: pointer;
    user-select: none;
}

/* ============================================
   BOUTONS
   ============================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    width: 100%;
    padding: 12px 24px;
    font-size: 15px;
    font-weight: 500;
    text-decoration: none;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-normal);
    outline: none;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-primary {
    background: var(--primary-blue);
    color: var(--white);
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover:not(:disabled) {
    background: var(--primary-dark);
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
}

.btn-icon {
    width: 20px;
    height: 20px;
}

/* ============================================
   ALERTES & MESSAGES
   ============================================ */

.alert {
    padding: 12px 16px;
    margin-bottom: var(--spacing-lg);
    border-radius: var(--radius-sm);
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.alert-error {
    background: #fce8e6;
    color: var(--error);
    border: 1px solid #f5c6cb;
}

.alert-success {
    background: #e6f4ea;
    color: var(--success);
    border: 1px solid #c3e6cb;
}

.alert-info {
    background: #e8f0fe;
    color: var(--primary-blue);
    border: 1px solid #aecbfa;
}

/* ============================================
   FOOTER
   ============================================ */

.auth-footer {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    text-align: center;
    font-size: 12px;
    color: var(--text-muted);
}

/* ============================================
   ANIMATIONS
   ============================================ */

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

.auth-card {
    animation: fadeIn 0.4s ease-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-10px); }
    75% { transform: translateX(10px); }
}

.shake {
    animation: shake 0.5s ease-in-out;
}

/* ============================================
   LOADING SPINNER
   ============================================ */

.spinner {
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: var(--white);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 480px) {
    .auth-container {
        padding: var(--spacing-md);
    }
    
    .auth-card {
        padding: var(--spacing-lg);
    }
    
    .form-options {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }
}

/* ============================================
   UTILITAIRES
   ============================================ */

.text-center {
    text-align: center;
}

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

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }

.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }

.hidden {
    display: none !important;
}