/* ========================================
   CSS Variables
   ======================================== */
:root {
    /* Primary Colors */
    --color-primary: #0059A8;
    --color-primary-dark: #003D73;
    --color-primary-light: #E8F1FA;

    /* Neutral Colors */
    --color-white: #FFFFFF;
    --color-background: #F5F7FA;
    --color-text-primary: #1A1A2E;
    --color-text-secondary: #5A6170;
    --color-border: #D1D9E6;
    --color-gray-light: #E5E9F0;

    /* Accent Colors */
    --color-success: #10B981;
    --color-error: #EF4444;
    --color-warning: #F59E0B;

    /* Typography */
    --font-heading: 'Montserrat', sans-serif;
    --font-body: 'Inter', sans-serif;

    /* Spacing */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    --space-3xl: 64px;
    --space-4xl: 96px;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;

    /* Shadows */
    --shadow-card: 0 4px 6px -1px rgba(0, 37, 83, 0.1), 0 2px 4px -1px rgba(0, 37, 83, 0.06);
    --shadow-button: 0 10px 15px -3px rgba(0, 37, 83, 0.1);
    --shadow-input: 0 0 0 3px rgba(0, 89, 168, 0.1);

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.5;
    color: var(--color-text-primary);
    background-color: var(--color-background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    animation: fadeIn 0.5s ease-out;
}

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

/* ========================================
   Container
   ======================================== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

@media (min-width: 640px) {
    .container {
        padding: 0 var(--space-2xl);
    }
}

/* ========================================
   Header
   ======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background-color: var(--color-white);
    box-shadow: 0 1px 3px rgba(0, 37, 83, 0.1);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.logo-icon {
    width: 32px;
    height: 32px;
}

.logo-text {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-primary);
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
    position: relative;
    padding: var(--space-4xl) 0;
    padding-top: calc(64px + var(--space-4xl));
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    overflow: hidden;
}

.hero-bg-pattern {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        linear-gradient(30deg, transparent 49.5%, rgba(255, 255, 255, 0.05) 49.5%, rgba(255, 255, 255, 0.05) 50.5%, transparent 50.5%),
        linear-gradient(150deg, transparent 49.5%, rgba(255, 255, 255, 0.05) 49.5%, rgba(255, 255, 255, 0.05) 50.5%, transparent 50.5%);
    background-size: 60px 100px;
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-family: var(--font-heading);
    font-size: 2rem;
    font-weight: 700;
    line-height: 1.2;
    color: var(--color-white);
    margin-bottom: var(--space-md);
}

.hero-subtitle {
    font-size: 1.125rem;
    line-height: 1.6;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--space-xl);
}

.hero-cta {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
}

.hero-cta.btn-secondary {
    color: var(--color-white);
    border-color: var(--color-white);
}

.hero-cta.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

@media (min-width: 640px) {
    .hero-title {
        font-size: 3rem;
    }

    .hero-subtitle {
        font-size: 1.25rem;
    }
}

/* ========================================
   Buttons
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-xl);
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 600;
    line-height: 1;
    text-decoration: none;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn:focus {
    outline: none;
    box-shadow: var(--shadow-input);
}

.btn-primary {
    background-color: var(--color-primary);
    color: var(--color-white);
}

.btn-primary:hover:not(:disabled) {
    background-color: var(--color-primary-dark);
    transform: scale(1.02);
    box-shadow: var(--shadow-button);
}

.btn-primary:active:not(:disabled) {
    transform: scale(0.98);
}

.btn-primary:disabled {
    background-color: var(--color-border);
    color: var(--color-text-secondary);
    cursor: not-allowed;
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

.btn-secondary:hover:not(:disabled) {
    background-color: var(--color-primary-light);
}

.btn-small {
    padding: var(--space-sm) var(--space-md);
    font-size: 0.875rem;
}

.btn-full {
    width: 100%;
}

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

/* Loading state */
.btn-loader {
    display: none;
}

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

.btn.loading .btn-loader {
    display: inline-flex;
}

.spinner {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

/* ========================================
   Features Section
   ======================================== */
.features {
    padding: var(--space-3xl) 0;
    background-color: var(--color-white);
}

.section-title {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    text-align: center;
    color: var(--color-text-primary);
    margin-bottom: var(--space-sm);
}

.section-subtitle {
    font-size: 1rem;
    text-align: center;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-2xl);
}

@media (min-width: 640px) {
    .section-title {
        font-size: 2rem;
    }
}

.features-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-lg);
}

@media (min-width: 640px) {
    .features-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.feature-card {
    text-align: center;
    padding: var(--space-xl);
}

.feature-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 80px;
    height: 80px;
    margin-bottom: var(--space-lg);
    background-color: var(--color-primary-light);
    border-radius: 50%;
}

.feature-title {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--space-sm);
}

.feature-description {
    font-size: 0.9375rem;
    line-height: 1.6;
    color: var(--color-text-secondary);
}

/* ========================================
   Registration Section
   ======================================== */
.registration {
    padding: var(--space-3xl) 0;
    background-color: var(--color-background);
}

.registration-card {
    max-width: 560px;
    margin: 0 auto;
    padding: var(--space-xl);
    background-color: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
}

@media (min-width: 640px) {
    .registration-card {
        padding: var(--space-2xl);
    }
}

.registration-header {
    text-align: center;
    margin-bottom: var(--space-xl);
}

.registration-title {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--space-xs);
}

.registration-subtitle {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
}

/* ========================================
   Form Styles
   ======================================== */
.form-group {
    margin-bottom: var(--space-lg);
}

.form-label {
    display: block;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-text-primary);
    margin-bottom: var(--space-sm);
}

.form-label .optional {
    font-weight: 400;
    color: var(--color-text-secondary);
}

.form-input {
    width: 100%;
    height: 48px;
    padding: 14px var(--space-md);
    font-family: var(--font-body);
    font-size: 1rem;
    color: var(--color-text-primary);
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

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

.form-input:focus {
    outline: none;
    border-color: var(--color-primary);
    border-width: 2px;
    padding: 13px 15px;
    box-shadow: var(--shadow-input);
}

.form-input.error {
    border-color: var(--color-error);
    border-width: 2px;
    padding: 13px 15px;
    background-color: #FEF2F2;
}

.form-input.error:focus {
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

.form-input:disabled {
    background-color: var(--color-background);
    border-color: var(--color-gray-light);
    color: var(--color-text-secondary);
}

.form-error {
    display: block;
    font-size: 0.8125rem;
    color: var(--color-error);
    margin-top: var(--space-xs);
    min-height: 20px;
}

.form-hint {
    display: block;
    font-size: 0.8125rem;
    color: var(--color-text-secondary);
    margin-top: var(--space-xs);
}

/* Input with button */
.input-with-button {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

@media (min-width: 480px) {
    .input-with-button {
        flex-direction: row;
    }

    .input-with-button .form-input {
        flex: 1;
    }
}

/* ========================================
   Checkboxes
   ======================================== */
.checkbox-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.checkbox_item,
.checkbox-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    cursor: pointer;
}

.checkbox-input {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.checkbox-custom {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.checkbox-check {
    opacity: 0;
    transform: scale(0.5);
    transition: all var(--transition-fast);
}

.checkbox-input:checked + .checkbox-custom {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
}

.checkbox-input:checked + .checkbox-custom .checkbox-check {
    opacity: 1;
    transform: scale(1);
}

.checkbox-input:focus + .checkbox-custom {
    box-shadow: var(--shadow-input);
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 0.9375rem;
    color: var(--color-text-primary);
}

.checkbox-icon {
    width: 20px;
    height: 20px;
    color: var(--color-text-secondary);
}

/* ========================================
   Success Message
   ======================================== */
.success-message {
    text-align: center;
    padding: var(--space-xl);
}

.success-icon {
    margin-bottom: var(--space-lg);
}

.success-icon svg {
    width: 64px;
    height: 64px;
}

.success-title {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--space-sm);
}

.success-text {
    font-size: 1rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-lg);
}

/* ========================================
   Footer
   ======================================== */
.footer {
    padding: var(--space-xl) 0;
    background-color: var(--color-white);
    border-top: 1px solid var(--color-gray-light);
}

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

.footer-text {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-xs);
}

.footer-disclaimer {
    font-size: 0.75rem;
    color: var(--color-text-secondary);
}

/* ========================================
   Modal
   ======================================== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-lg);
}

.modal[hidden] {
    display: none;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(26, 26, 46, 0.5);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    width: 100%;
    max-width: 480px;
    max-height: 90vh;
    overflow-y: auto;
    padding: var(--space-xl);
    background-color: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: 0 25px 50px -12px rgba(0, 37, 83, 0.25);
}

.modal-close {
    position: absolute;
    top: var(--space-md);
    right: var(--space-md);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: none;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background-color: var(--color-gray-light);
    color: var(--color-text-primary);
}

.modal-title {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--space-lg);
}

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

.modal-steps {
    list-style: none;
    counter-reset: step;
    margin-bottom: var(--space-lg);
}

.modal-steps li {
    position: relative;
    padding-left: 36px;
    margin-bottom: var(--space-md);
    font-size: 0.9375rem;
    color: var(--color-text-primary);
    counter-increment: step;
}

.modal-steps li::before {
    content: counter(step);
    position: absolute;
    left: 0;
    top: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    background-color: var(--color-primary);
    color: var(--color-white);
    border-radius: 50%;
    font-size: 0.75rem;
    font-weight: 600;
}

.modal-note {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-lg);
    padding: var(--space-md);
    background-color: var(--color-primary-light);
    border-radius: var(--radius-md);
}

/* ========================================
   Utility Classes
   ======================================== */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ========================================
   Responsive Adjustments
   ======================================== */
@media (max-width: 639px) {
    .hero {
        padding-top: calc(64px + var(--space-3xl));
    }

    .features {
        padding: var(--space-2xl) 0;
    }

    .registration {
        padding: var(--space-2xl) 0;
    }

    .registration-card {
        padding: var(--space-lg);
    }
}

@media (min-width: 1024px) {
    .hero {
        padding: calc(64px + var(--space-4xl)) 0 var(--space-4xl);
    }

    .features {
        padding: var(--space-3xl) 0;
    }

    .registration {
        padding: var(--space-3xl) 0;
    }
}

/* ========================================
   Navigation Menu
   ======================================== */
.nav-menu {
    display: flex;
    gap: var(--space-lg);
    align-items: center;
}

.nav-link {
    font-family: var(--font-body);
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text-primary);
    text-decoration: none;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.nav-link:hover {
    background-color: var(--color-primary-light);
    color: var(--color-primary);
}

@media (max-width: 639px) {
    .nav-menu {
        gap: var(--space-sm);
    }

    .nav-link {
        font-size: 12px;
        padding: var(--space-xs) var(--space-sm);
    }
}

/* ========================================
   Calendario Section
   ======================================== */
.calendario {
    padding: var(--space-3xl) 0;
    background-color: var(--color-white);
}

.calendario-card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
    padding: var(--space-xl);
    margin-top: var(--space-xl);
}

.calendario-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-lg);
    margin-bottom: var(--space-xl);
    padding-bottom: var(--space-lg);
    border-bottom: 1px solid var(--color-border);
}

.calendario-stats {
    display: flex;
    gap: var(--space-xl);
    flex-wrap: wrap;
}

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

.stat-number {
    display: block;
    font-family: var(--font-heading);
    font-size: 32px;
    font-weight: 700;
    color: var(--color-primary);
}

.stat-label {
    font-size: 12px;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.calendario-list {
    min-height: 200px;
}

.loading-spinner {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-2xl);
    color: var(--color-text-secondary);
}

.loading-spinner .spinner {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.empty-state {
    text-align: center;
    padding: var(--space-2xl);
    color: var(--color-text-secondary);
}

.empty-state svg {
    margin-bottom: var(--space-md);
}

.empty-state p {
    font-size: 18px;
    font-weight: 500;
    margin-bottom: var(--space-xs);
}

.empty-state span {
    font-size: 14px;
}

.citas-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.cita-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md);
    background: var(--color-gray-light);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--color-success);
}

.cita-item.sin-citas {
    border-left-color: var(--color-text-secondary);
}

.cita-icon {
    flex-shrink: 0;
}

.cita-content {
    flex: 1;
}

.cita-fecha {
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--space-xs);
}

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

.cita-badge {
    display: inline-block;
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
}

.cita-badge.disponible {
    background: #D1FAE5;
    color: #065F46;
}

.cita-badge.no-disponible {
    background: var(--color-gray-light);
    color: var(--color-text-secondary);
}

@media (max-width: 639px) {
    .calendario-header {
        flex-direction: column;
        align-items: stretch;
    }

    .calendario-stats {
        justify-content: space-around;
    }

    .stat-number {
        font-size: 24px;
    }
}