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

/* Variables CSS */
:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --success-color: #059669;
    --error-color: #dc2626;
    --text-color: #1f2937;
    --text-secondary: #6b7280;
    --background: #f8fafc;
    --card-background: #ffffff;
    --border-color: #e5e7eb;
    --shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --border-radius: 12px;
}

/* Estilos globales */
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    width: 100%;
    max-width: 450px;
    margin: 0 auto;
    padding: 20px;
}

.card {
    background: var(--card-background);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    padding: 40px;
    margin-bottom: 20px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.header {
    text-align: center;
    margin-bottom: 32px;
}

.header h1 {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 8px;
    letter-spacing: -0.025em;
}

.header p {
    color: var(--text-secondary);
    font-size: 14px;
}

.form {
    margin-bottom: 24px;
}

.input-group {
    margin-bottom: 24px;
}

.input-group label {
    display: block;
    font-weight: 500;
    color: var(--text-color);
    margin-bottom: 8px;
    font-size: 14px;
}

.input-group input {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 16px;
    transition: all 0.2s ease;
    background: #ffffff;
}

.input-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

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

.btn-primary {
    width: 100%;
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 14px 24px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 48px;
}

.btn-primary:hover:not(:disabled) {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.4);
}

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

.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.btn-secondary {
    width: 100%;
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    padding: 12px 24px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    margin-top: 12px;
    min-height: 44px;
}

.btn-secondary:hover:not(:disabled) {
    background: var(--primary-color);
    color: white;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

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

.btn-secondary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.spinner {
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s ease-in-out infinite;
}

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

.error-message {
    background: #fef2f2;
    color: var(--error-color);
    padding: 12px 16px;
    border-radius: 8px;
    border: 1px solid #fecaca;
    font-size: 14px;
    text-align: center;
    margin-top: 16px;
    animation: fadeIn 0.3s ease;
}

.success-message {
    background: #ecfdf5;
    color: var(--success-color);
    padding: 12px 16px;
    border-radius: 8px;
    border: 1px solid #a7f3d0;
    font-size: 14px;
    text-align: center;
    margin-top: 16px;
    animation: fadeIn 0.3s ease;
}

.hidden {
    display: none;
}

.footer {
    text-align: center;
    color: rgba(255, 255, 255, 0.8);
    font-size: 12px;
}

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

/* Responsive design */
@media (max-width: 480px) {
    .container {
        padding: 16px;
    }
    
    .card {
        padding: 24px;
    }
    
    .header h1 {
        font-size: 20px;
    }
    
    .input-group input,
    .btn-primary {
        font-size: 16px; /* Evita zoom en iOS */
    }
}

/* Animación de entrada */
.card {
    animation: slideUp 0.5s ease;
}

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

/* Estados adicionales */
.shake {
    animation: shake 0.5s ease-in-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}