@import url("https://fonts.googleapis.com/css2?family=Montserrat:wght@300;400;600;700&display=swap");

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

:root {
    --primary-blue: #0a4275;
    --dark-blue: #003366;
    --light-blue: #004a8f;
    --gray-light: #e7e9eb;
    --gray-dark: #333;
    --white: #ffffff;
    --success-green: #28a745;
    --error-red: #dc3545;
    --border-radius: 12px;
    --transition: all 0.3s ease;
}

body {
    font-family: "Montserrat", sans-serif;
    background: linear-gradient(135deg, var(--gray-light) 0%, #d4d6d8 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.main-container {
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    width: 100%;
    max-width: 900px;
    min-height: 600px;
    display: flex;
    position: relative;
}

/* Panel de navegación */
.nav-panel {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--dark-blue) 100%);
    width: 300px;
    padding: 40px 30px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    color: var(--white);
    position: relative;
    overflow: hidden;
}

.nav-panel::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px) rotate(0deg);
    }
    50% {
        transform: translateY(-20px) rotate(180deg);
    }
}

.nav-content {
    position: relative;
    z-index: 2;
}

.nav-panel h1 {
    font-size: 2.2rem;
    font-weight: 700;
    margin-bottom: 20px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.nav-panel p {
    font-size: 1.1rem;
    line-height: 1.6;
    margin-bottom: 30px;
    opacity: 0.9;
}

.nav-button {
    background: transparent;
    border: 2px solid var(--white);
    color: var(--white);
    padding: 12px 30px;
    border-radius: 25px;
    font-size: 14px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.nav-button:hover {
    background: var(--white);
    color: var(--primary-blue);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(255, 255, 255, 0.3);
}

/* Panel de formularios */
.form-panel {
    flex: 1;
    padding: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.form-container {
    width: 100%;
    max-width: 400px;
}

.form-container.hidden {
    display: none;
}

.form-title {
    color: var(--primary-blue);
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 10px;
    text-align: center;
}

.form-subtitle {
    color: var(--gray-dark);
    font-size: 0.95rem;
    margin-bottom: 30px;
    text-align: center;
    opacity: 0.8;
}

.form-group {
    margin-bottom: 20px;
}

.form-group.row {
    display: flex;
    gap: 15px;
}

.form-group.row .form-field {
    flex: 1;
}

.form-group.row .form-field:first-child {
    flex: 2;
}

.section-title {
    color: var(--primary-blue);
    font-size: 0.9rem;
    font-weight: 600;
    margin: 25px 0 15px 0;
    display: flex;
    align-items: center;
    gap: 8px;
}

.form-field {
    position: relative;
}

.form-input {
    width: 100%;
    padding: 15px 20px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 14px;
    font-family: inherit;
    transition: var(--transition);
    background: #fafafa;
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-blue);
    background: var(--white);
    box-shadow: 0 0 0 3px rgba(10, 66, 117, 0.1);
}

.form-input::placeholder {
    color: #999;
}

.field-hint {
    font-size: 0.8rem;
    color: #666;
    margin-top: 5px;
    opacity: 0.8;
}

.submit-button {
    width: 100%;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--light-blue) 100%);
    color: var(--white);
    border: none;
    padding: 15px 20px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    cursor: pointer;
    transition: var(--transition);
    margin-top: 20px;
    position: relative;
    overflow: hidden;
}

.submit-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(10, 66, 117, 0.3);
}

.submit-button:active {
    transform: translateY(0);
}

.submit-button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* Alertas */
.alert {
    padding: 12px 16px;
    border-radius: 6px;
    margin-bottom: 20px;
    font-size: 14px;
    display: none;
}

.alert.show {
    display: block;
    animation: slideIn 0.3s ease;
}

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

.alert-success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.alert-error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

/* Botón de tema */
.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--primary-blue);
    color: var(--white);
    border: none;
    padding: 12px 16px;
    border-radius: 50px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    transition: var(--transition);
    z-index: 1000;
    display: flex;
    align-items: center;
    gap: 8px;
}

.theme-toggle:hover {
    background: var(--light-blue);
    transform: scale(1.05);
}

/* Modo oscuro */
body.dark-mode {
    background: linear-gradient(135deg, #1a1a1a 0%, #2d2d30 100%);
}

body.dark-mode .main-container {
    background: #2d2d30;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

body.dark-mode .form-panel {
    background: #2d2d30;
}

body.dark-mode .form-input {
    background: #3a3a3c;
    border-color: #4a4a4c;
    color: var(--white);
}

body.dark-mode .form-input:focus {
    background: #3a3a3c;
    border-color: var(--primary-blue);
}

body.dark-mode .form-input::placeholder {
    color: #999;
}

body.dark-mode .form-title,
body.dark-mode .section-title {
    color: #4da3e0;
}

body.dark-mode .form-subtitle,
body.dark-mode .field-hint {
    color: #ccc;
}

/* Estados de validación */
.form-input.valid {
    border-color: var(--success-green);
    background: #f8fff9;
}

.form-input.invalid {
    border-color: var(--error-red);
    background: #fff8f8;
}

/* Loader */
.loading {
    position: relative;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid transparent;
    border-top: 2px solid var(--white);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Mensajes de error de validación */
.input-error-message {
    color: var(--error-red);
    font-size: 0.8rem;
    margin-top: 5px;
    display: block;
}

.form-input.error {
    border-color: var(--error-red);
    background: #fff8f8;
}

/* Indicador de fortaleza de contraseña */
.password-strength {
    margin-top: 5px;
    font-size: 0.8rem;
    font-weight: 600;
}

.password-strength.weak {
    color: var(--error-red);
}

.password-strength.medium {
    color: #ffa500;
}

.password-strength.strong {
    color: var(--success-green);
}

.password-strength.very-strong {
    color: #006400;
}

/* Responsive */
@media (max-width: 768px) {
    .main-container {
        flex-direction: column;
        max-width: 100%;
        min-height: auto;
    }

    .nav-panel {
        width: 100%;
        padding: 30px 20px;
        order: 2;
    }

    .form-panel {
        padding: 30px 20px;
        order: 1;
    }

    .form-group.row {
        flex-direction: column;
        gap: 0;
    }

    .form-group.row .form-field:first-child {
        flex: 1;
    }

    .nav-panel h1 {
        font-size: 1.8rem;
    }

    .form-title {
        font-size: 1.7rem;
    }
}

@media (max-width: 480px) {
    body {
        padding: 10px;
    }

    .form-panel {
        padding: 20px 15px;
    }

    .theme-toggle {
        top: 10px;
        right: 10px;
        padding: 10px 12px;
        font-size: 12px;
    }
}