:root {
    /* Palette de couleurs moderne */
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --border-color: #334155;

    /* Couleurs d'état */
    --color-success: #10b981;
    --color-danger: #ef4444;
    --color-info: #3b82f6;

    /* Couleur d'accent */
    --color-accent: #06b6d4;
    --color-accent-light: #22d3ee;
    --color-accent-dark: #0891b2;

    /* Typographie */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;

    /* 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 */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;

    /* Ombres */
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.4), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

/* Reset */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
}

body {
    font-family: var(--font-sans);
    background: linear-gradient(to bottom, #1a2642 0%, var(--bg-primary) 50%);
    min-height: 100vh;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Login Wrapper */
.login-wrapper {
    width: 100%;
    max-width: 420px;
    animation: fadeInUp 0.5s ease;
}

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

/* Login Container */
.login-container {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-xl);
}

/* Login Header */
.login-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.logo {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--spacing-lg);
    background: linear-gradient(135deg, var(--color-accent-dark), var(--color-accent));
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo i {
    font-size: 2rem;
    color: white;
}

.login-header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.025em;
}

.login-header p {
    font-size: 0.9375rem;
    color: var(--text-muted);
    margin: 0;
}

/* Alert */
.alert {
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
    font-size: 0.875rem;
    display: none;
    animation: slideDown 0.3s ease;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.alert.show {
    display: block;
}

.alert-error {
    background: rgba(239, 68, 68, 0.15);
    color: #f87171;
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.alert-success {
    background: rgba(16, 185, 129, 0.15);
    color: #34d399;
    border: 1px solid rgba(16, 185, 129, 0.3);
}

/* Login Form */
.login-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.form-group label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.form-group label i {
    font-size: 0.875rem;
    color: var(--color-accent);
}

.form-group input {
    width: 100%;
    padding: var(--spacing-md);
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: var(--radius-md);
    font-size: 0.9375rem;
    font-family: var(--font-sans);
    transition: all 0.2s ease;
}

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

.form-group input:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.1);
}

/* Login Button */
.btn-login {
    width: 100%;
    padding: var(--spacing-md);
    background: linear-gradient(135deg, var(--color-accent-dark), var(--color-accent));
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    font-family: var(--font-sans);
    cursor: pointer;
    transition: all 0.2s ease;
    margin-top: var(--spacing-sm);
}

.btn-login:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(6, 182, 212, 0.3);
}

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

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

/* Loading Spinner */
.loading-spinner {
    display: none;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto;
}

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

.btn-login.loading .btn-text {
    display: none;
}

.btn-login.loading .loading-spinner {
    display: block;
}

/* Security Info */
.security-info {
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

.security-badges {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
}

.security-badge {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
}

.security-badge i {
    font-size: 1.25rem;
    color: var(--color-accent);
}

.security-badge span {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Responsive */
@media (max-width: 480px) {
    body {
        padding: var(--spacing-md);
    }

    .login-container {
        padding: var(--spacing-xl);
    }

    .login-header h1 {
        font-size: 1.5rem;
    }

    .logo {
        width: 56px;
        height: 56px;
    }

    .logo i {
        font-size: 1.75rem;
    }

    .security-badges {
        gap: var(--spacing-md);
    }
}