/* ===== RESET Y VARIABLES ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #1976d2;
    --primary-dark: #1565c0;
    --primary-light: #42a5f5;
    --success-color: #4caf50;
    --error-color: #f44336;
    --background-color: #f5f6fa;
    --surface-color: #ffffff;
    --text-primary: #2c3e50;
    --text-secondary: #7f8c8d;
    --border-color: #e1e5e9;
    --shadow: 0 4px 20px rgba(0,0,0,0.1);
    --border-radius: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

/* ===== LOGIN CONTAINER ===== */
.login-container {
    width: 100%;
    max-width: 420px;
    animation: slideUp 0.6s ease-out;
}

.login-card {
    background: var(--surface-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    overflow: hidden;
    position: relative;
}

/* ===== LOGIN HEADER ===== */
.login-header {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    padding: 40px 30px;
    text-align: center;
    color: white;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-bottom: 10px;
}

.logo i {
    font-size: 2.5rem;
}

.logo h1 {
    font-size: 2rem;
    font-weight: 600;
}

.subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
    font-weight: 300;
}

/* ===== LOGIN FORM ===== */
.login-form {
    padding: 40px 30px 20px;
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
    font-size: 0.95rem;
}

.form-group label i {
    color: var(--primary-color);
    width: 16px;
}

.form-group input {
    width: 100%;
    padding: 15px 20px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 16px;
    transition: var(--transition);
    background: #fafbfc;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    background: white;
    box-shadow: 0 0 0 3px rgba(25, 118, 210, 0.1);
}

.form-group input::placeholder {
    color: #a0a0a0;
}

/* ===== LOGIN BUTTON ===== */
.login-btn {
    width: 100%;
    padding: 15px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-bottom: 20px;
}

.login-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(25, 118, 210, 0.3);
}

.login-btn:active {
    transform: translateY(0);
}

/* ===== LOGIN INFO ===== */
.login-info {
    padding: 0 30px 20px;
}

.demo-credentials {
    background: #e3f2fd;
    padding: 20px;
    border-radius: 8px;
    border-left: 4px solid var(--primary-color);
}

.demo-credentials h4 {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--primary-color);
    margin-bottom: 12px;
    font-size: 1rem;
}

.demo-credentials p {
    margin-bottom: 5px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.demo-credentials p strong {
    color: var(--text-primary);
}

/* ===== LOGIN FOOTER ===== */
.login-footer {
    background: #f8f9fa;
    padding: 20px 30px;
    text-align: center;
    border-top: 1px solid #e9ecef;
}

.login-footer p {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

/* ===== ALERTAS ===== */
.alert {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 15px 20px;
    margin: 15px 30px;
    border-radius: 8px;
    font-weight: 500;
    animation: slideDown 0.3s ease-out;
}

.alert-success {
    background: #d4edda;
    color: #155724;
    border-left: 4px solid var(--success-color);
}

.alert-error {
    background: #f8d7da;
    color: #721c24;
    border-left: 4px solid var(--error-color);
}

.alert i {
    font-size: 1.1rem;
}

/* ===== ANIMACIONES ===== */
@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

/* ===== RESPONSIVE ===== */
@media (max-width: 480px) {
    .login-container {
        max-width: 100%;
        margin: 0 10px;
    }
    
    .login-header {
        padding: 30px 20px;
    }
    
    .logo h1 {
        font-size: 1.6rem;
    }
    
    .login-form {
        padding: 30px 20px;
    }
    
    .login-info {
        padding: 0 20px 20px;
    }
    
    .login-footer {
        padding: 15px 20px;
    }
    
    .alert {
        margin: 15px 20px;
    }
}

/* ===== ESTADOS DE CARGA ===== */
.login-btn.loading {
    position: relative;
    color: transparent;
}

.login-btn.loading::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255,255,255,0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s linear infinite;
}

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