/* ==========================================================================
   Curso de Producción Escrita C2 - Estilos Principales
   ========================================================================== */

/* Variables CSS */
:root {
    /* Colores principales */
    --primary-color: #1a365d;
    --primary-light: #2c5282;
    --primary-dark: #0f2442;
    --secondary-color: #c53030;
    --secondary-light: #e53e3e;
    --accent-color: #d69e2e;
    --accent-light: #ecc94b;

    /* Colores neutros */
    --text-primary: #1a202c;
    --text-secondary: #4a5568;
    --text-light: #718096;
    --bg-light: #f7fafc;
    --bg-white: #ffffff;
    --border-color: #e2e8f0;
    --border-dark: #cbd5e0;

    /* Colores de estado */
    --success-color: #38a169;
    --success-light: #c6f6d5;
    --warning-color: #d69e2e;
    --warning-light: #fefcbf;
    --error-color: #e53e3e;
    --error-light: #fed7d7;
    --info-color: #3182ce;
    --info-light: #bee3f8;

    /* Tipografía */
    --font-primary: 'Playfair Display', Georgia, serif;
    --font-secondary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;

    /* Espaciado */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;

    /* Bordes y sombras */
    --border-radius-sm: 0.25rem;
    --border-radius-md: 0.5rem;
    --border-radius-lg: 1rem;
    --border-radius-xl: 1.5rem;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    /* Transiciones */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;

    /* Contenedores */
    --container-sm: 640px;
    --container-md: 768px;
    --container-lg: 1024px;
    --container-xl: 1280px;
}

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

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

body {
    font-family: var(--font-secondary);
    font-size: 1rem;
    line-height: 1.7;
    color: var(--text-primary);
    background-color: var(--bg-light);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Tipografía */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-primary);
    font-weight: 700;
    line-height: 1.3;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

h1 {
    font-size: clamp(2rem, 5vw, 3rem);
}

h2 {
    font-size: clamp(1.5rem, 4vw, 2.25rem);
}

h3 {
    font-size: clamp(1.25rem, 3vw, 1.75rem);
}

h4 {
    font-size: 1.25rem;
}

h5 {
    font-size: 1.125rem;
}

h6 {
    font-size: 1rem;
}

p {
    margin-bottom: var(--spacing-md);
}

a {
    color: var(--primary-light);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--secondary-color);
}

strong, b {
    font-weight: 600;
}

/* Contenedores */
.container {
    width: 100%;
    max-width: var(--container-xl);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.container-sm {
    max-width: var(--container-sm);
}

.container-md {
    max-width: var(--container-md);
}

.container-lg {
    max-width: var(--container-lg);
}

/* ==========================================================================
   Header y Navegación
   ========================================================================== */
.header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-lg);
}

.header-top {
    background: rgba(0, 0, 0, 0.2);
    padding: var(--spacing-xs) 0;
    font-size: 0.875rem;
}

.header-top .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-top a {
    color: rgba(255, 255, 255, 0.8);
}

.header-top a:hover {
    color: white;
}

.header-main {
    padding: var(--spacing-md) 0;
}

.header-main .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-lg);
}

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

.logo-icon {
    width: 50px;
    height: 50px;
    background: var(--accent-color);
    border-radius: var(--border-radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-dark);
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-title {
    font-family: var(--font-primary);
    font-size: 1.5rem;
    font-weight: 700;
    color: white;
    line-height: 1.2;
}

.logo-subtitle {
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.7);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

/* Navegación principal */
.nav-main {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.nav-main a {
    color: rgba(255, 255, 255, 0.9);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-md);
    font-weight: 500;
    font-size: 0.9375rem;
    transition: all var(--transition-fast);
    position: relative;
}

.nav-main a:hover,
.nav-main a.active {
    background: rgba(255, 255, 255, 0.15);
    color: white;
}

.nav-main a.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 30px;
    height: 3px;
    background: var(--accent-color);
    border-radius: 2px;
}

/* Menú desplegable */
.dropdown {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background: white;
    min-width: 220px;
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-xl);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all var(--transition-base);
    z-index: 100;
    padding: var(--spacing-sm) 0;
}

.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu a {
    display: block;
    color: var(--text-primary);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 0.875rem;
}

.dropdown-menu a:hover {
    background: var(--bg-light);
    color: var(--primary-color);
}

/* Botones de autenticación */
.nav-auth {
    display: flex;
    gap: var(--spacing-sm);
    margin-left: var(--spacing-lg);
}

/* Menú móvil */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    padding: var(--spacing-sm);
}

.menu-toggle span {
    display: block;
    width: 25px;
    height: 3px;
    background: white;
    margin: 5px 0;
    border-radius: 2px;
    transition: var(--transition-base);
}

/* ==========================================================================
   Botones
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-family: var(--font-secondary);
    font-size: 0.9375rem;
    font-weight: 500;
    border-radius: var(--border-radius-md);
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    white-space: nowrap;
}

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

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

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

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

.btn-secondary:hover {
    background: var(--secondary-light);
    border-color: var(--secondary-light);
    color: white;
}

.btn-accent {
    background: var(--accent-color);
    color: var(--primary-dark);
    border-color: var(--accent-color);
}

.btn-accent:hover {
    background: var(--accent-light);
    border-color: var(--accent-light);
}

.btn-outline {
    background: transparent;
    color: var(--primary-color);
    border-color: var(--primary-color);
}

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

.btn-outline-white {
    background: transparent;
    color: white;
    border-color: rgba(255, 255, 255, 0.5);
}

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

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
    border-color: transparent;
}

.btn-ghost:hover {
    background: var(--bg-light);
    color: var(--primary-color);
}

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

.btn-lg {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1.0625rem;
}

.btn-icon {
    padding: var(--spacing-sm);
    width: 40px;
    height: 40px;
}

.btn-block {
    width: 100%;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    padding: var(--spacing-3xl) 0;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.5;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
}

.hero-badge {
    display: inline-block;
    background: rgba(255, 255, 255, 0.15);
    color: var(--accent-light);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: var(--spacing-lg);
    backdrop-filter: blur(10px);
}

.hero h1 {
    color: white;
    margin-bottom: var(--spacing-lg);
    font-size: clamp(2.5rem, 6vw, 3.5rem);
}

.hero-description {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: var(--spacing-xl);
    line-height: 1.8;
}

.hero-actions {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.hero-stats {
    display: flex;
    gap: var(--spacing-2xl);
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid rgba(255, 255, 255, 0.2);
}

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

.hero-stat-value {
    font-family: var(--font-primary);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent-color);
    display: block;
}

.hero-stat-label {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.7);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ==========================================================================
   Cards
   ========================================================================== */
.card {
    background: white;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: all var(--transition-base);
}

.card:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-4px);
}

.card-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.card-body {
    padding: var(--spacing-lg);
}

.card-footer {
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    background: var(--bg-light);
}

/* Card de sesión */
.session-card {
    position: relative;
}

.session-card-badge {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: var(--primary-color);
    color: white;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
}

.session-card-badge.completed {
    background: var(--success-color);
}

.session-card-badge.current {
    background: var(--accent-color);
    color: var(--primary-dark);
}

.session-number {
    font-size: 0.875rem;
    color: var(--text-light);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--spacing-xs);
}

.session-title {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
}

.session-date {
    color: var(--text-secondary);
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.session-objectives {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
}

.session-objectives h4 {
    font-size: 0.875rem;
    color: var(--text-light);
    margin-bottom: var(--spacing-sm);
}

.session-objectives ul {
    list-style: none;
    font-size: 0.875rem;
}

.session-objectives li {
    position: relative;
    padding-left: var(--spacing-lg);
    margin-bottom: var(--spacing-xs);
}

.session-objectives li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--success-color);
    font-weight: bold;
}

/* ==========================================================================
   Grid de sesiones
   ========================================================================== */
.sessions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--spacing-lg);
}

/* ==========================================================================
   Secciones
   ========================================================================== */
.section {
    padding: var(--spacing-3xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-header h2 {
    margin-bottom: var(--spacing-sm);
}

.section-header p {
    color: var(--text-secondary);
    font-size: 1.125rem;
    max-width: 600px;
    margin: 0 auto;
}

.section-alt {
    background: white;
}

/* ==========================================================================
   Calendario
   ========================================================================== */
.calendar {
    background: white;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
}

.calendar-header {
    background: var(--primary-color);
    color: white;
    padding: var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.calendar-title {
    font-family: var(--font-primary);
    font-size: 1.5rem;
}

.calendar-nav {
    display: flex;
    gap: var(--spacing-sm);
}

.calendar-nav button {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: white;
    width: 36px;
    height: 36px;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: background var(--transition-fast);
}

.calendar-nav button:hover {
    background: rgba(255, 255, 255, 0.3);
}

.calendar-weekdays {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    background: var(--bg-light);
    border-bottom: 1px solid var(--border-color);
}

.calendar-weekday {
    padding: var(--spacing-md);
    text-align: center;
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.calendar-days {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
}

.calendar-day {
    aspect-ratio: 1;
    padding: var(--spacing-sm);
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    cursor: pointer;
    transition: background var(--transition-fast);
}

.calendar-day:hover {
    background: var(--bg-light);
}

.calendar-day.other-month {
    background: var(--bg-light);
    color: var(--text-light);
}

.calendar-day.today {
    background: var(--info-light);
}

.calendar-day.has-session {
    background: var(--primary-color);
    color: white;
}

.calendar-day.has-session:hover {
    background: var(--primary-light);
}

.calendar-day-number {
    font-weight: 600;
    font-size: 0.875rem;
}

.calendar-day-event {
    font-size: 0.6875rem;
    margin-top: auto;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* ==========================================================================
   Formularios
   ========================================================================== */
.form-group {
    margin-bottom: var(--spacing-lg);
}

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

.form-label.required::after {
    content: ' *';
    color: var(--error-color);
}

.form-control {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    font-family: var(--font-secondary);
    font-size: 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-md);
    background: white;
    transition: all var(--transition-fast);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-light);
    box-shadow: 0 0 0 3px rgba(44, 82, 130, 0.15);
}

.form-control.error {
    border-color: var(--error-color);
}

.form-control.success {
    border-color: var(--success-color);
}

textarea.form-control {
    min-height: 150px;
    resize: vertical;
}

.form-hint {
    font-size: 0.875rem;
    color: var(--text-light);
    margin-top: var(--spacing-xs);
}

.form-error {
    font-size: 0.875rem;
    color: var(--error-color);
    margin-top: var(--spacing-xs);
}

/* Checkbox y Radio */
.form-check {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.form-check-input {
    width: 20px;
    height: 20px;
    margin-top: 2px;
    accent-color: var(--primary-color);
}

.form-check-label {
    font-size: 0.9375rem;
    cursor: pointer;
}

/* Select */
.form-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%234a5568' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right var(--spacing-sm) center;
    background-size: 20px;
    padding-right: var(--spacing-2xl);
}

/* ==========================================================================
   Editor de texto enriquecido
   ========================================================================== */
.text-editor {
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-md);
    overflow: hidden;
    background: white;
}

.editor-toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm);
    background: var(--bg-light);
    border-bottom: 1px solid var(--border-color);
}

.editor-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border: none;
    background: transparent;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

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

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

.editor-separator {
    width: 1px;
    height: 36px;
    background: var(--border-color);
    margin: 0 var(--spacing-xs);
}

.editor-content {
    min-height: 300px;
    padding: var(--spacing-lg);
    outline: none;
}

.editor-content:focus {
    background: var(--bg-light);
}

.editor-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-light);
    border-top: 1px solid var(--border-color);
    font-size: 0.875rem;
    color: var(--text-light);
}

/* ==========================================================================
   Badges y etiquetas
   ========================================================================== */
.badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 9999px;
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

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

.badge-secondary {
    background: var(--secondary-color);
    color: white;
}

.badge-success {
    background: var(--success-light);
    color: var(--success-color);
}

.badge-warning {
    background: var(--warning-light);
    color: var(--warning-color);
}

.badge-error {
    background: var(--error-light);
    color: var(--error-color);
}

.badge-info {
    background: var(--info-light);
    color: var(--info-color);
}

.badge-outline {
    background: transparent;
    border: 1px solid currentColor;
}

/* ==========================================================================
   Progreso
   ========================================================================== */
.progress {
    height: 8px;
    background: var(--bg-light);
    border-radius: 9999px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
    border-radius: 9999px;
    transition: width var(--transition-slow);
}

.progress-bar.success {
    background: var(--success-color);
}

.progress-bar.warning {
    background: var(--warning-color);
}

.progress-bar.error {
    background: var(--error-color);
}

/* ==========================================================================
   Alertas
   ========================================================================== */
.alert {
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--border-radius-md);
    border-left: 4px solid;
    margin-bottom: var(--spacing-md);
    display: flex;
    gap: var(--spacing-md);
}

.alert-icon {
    flex-shrink: 0;
    font-size: 1.25rem;
}

.alert-content {
    flex: 1;
}

.alert-title {
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.alert-success {
    background: var(--success-light);
    border-color: var(--success-color);
    color: var(--success-color);
}

.alert-warning {
    background: var(--warning-light);
    border-color: var(--warning-color);
    color: var(--warning-color);
}

.alert-error {
    background: var(--error-light);
    border-color: var(--error-color);
    color: var(--error-color);
}

.alert-info {
    background: var(--info-light);
    border-color: var(--info-color);
    color: var(--info-color);
}

/* ==========================================================================
   Tabs
   ========================================================================== */
.tabs {
    border-bottom: 2px solid var(--border-color);
    display: flex;
    gap: var(--spacing-xs);
    overflow-x: auto;
}

.tab {
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    background: transparent;
    font-family: var(--font-secondary);
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    position: relative;
    white-space: nowrap;
    transition: color var(--transition-fast);
}

.tab:hover {
    color: var(--primary-color);
}

.tab.active {
    color: var(--primary-color);
}

.tab.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary-color);
}

.tab-content {
    padding: var(--spacing-lg) 0;
}

.tab-pane {
    display: none;
}

.tab-pane.active {
    display: block;
}

/* ==========================================================================
   Modal
   ========================================================================== */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    padding: var(--spacing-lg);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: white;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-xl);
    max-width: 600px;
    width: 100%;
    max-height: 90vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transform: scale(0.9);
    transition: transform var(--transition-base);
}

.modal-overlay.active .modal {
    transform: scale(1);
}

.modal-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-title {
    font-size: 1.25rem;
    margin: 0;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-light);
    cursor: pointer;
    padding: var(--spacing-xs);
    line-height: 1;
    transition: color var(--transition-fast);
}

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

.modal-body {
    padding: var(--spacing-lg);
    overflow-y: auto;
    flex: 1;
}

.modal-footer {
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-sm);
}

/* ==========================================================================
   Tabla
   ========================================================================== */
.table-wrapper {
    overflow-x: auto;
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-sm);
}

table {
    width: 100%;
    border-collapse: collapse;
    background: white;
}

th, td {
    padding: var(--spacing-md);
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

th {
    background: var(--bg-light);
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

tr:hover td {
    background: var(--bg-light);
}

/* ==========================================================================
   Footer
   ========================================================================== */
.footer {
    background: var(--primary-dark);
    color: white;
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
    margin-top: auto;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-section h4 {
    color: var(--accent-color);
    font-size: 1rem;
    margin-bottom: var(--spacing-md);
}

.footer-section ul {
    list-style: none;
}

.footer-section li {
    margin-bottom: var(--spacing-sm);
}

.footer-section a {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9375rem;
}

.footer-section a:hover {
    color: white;
}

.footer-bottom {
    padding-top: var(--spacing-xl);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.6);
}

/* ==========================================================================
   Actividades interactivas
   ========================================================================== */
.activity {
    background: white;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-xl);
    overflow: hidden;
}

.activity-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    color: white;
    padding: var(--spacing-lg);
}

.activity-type {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    opacity: 0.8;
    margin-bottom: var(--spacing-xs);
}

.activity-title {
    font-size: 1.25rem;
    color: white;
    margin: 0;
}

.activity-body {
    padding: var(--spacing-lg);
}

.activity-instructions {
    background: var(--info-light);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
    margin-bottom: var(--spacing-lg);
    border-left: 4px solid var(--info-color);
}

.activity-footer {
    padding: var(--spacing-lg);
    background: var(--bg-light);
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Ejercicio de opciones múltiples */
.quiz-question {
    margin-bottom: var(--spacing-xl);
}

.quiz-question-text {
    font-weight: 500;
    margin-bottom: var(--spacing-md);
    font-size: 1.0625rem;
}

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

.quiz-option {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.quiz-option:hover {
    border-color: var(--primary-light);
    background: var(--bg-light);
}

.quiz-option.selected {
    border-color: var(--primary-color);
    background: rgba(44, 82, 130, 0.05);
}

.quiz-option.correct {
    border-color: var(--success-color);
    background: var(--success-light);
}

.quiz-option.incorrect {
    border-color: var(--error-color);
    background: var(--error-light);
}

.quiz-option input {
    display: none;
}

.quiz-option-marker {
    width: 24px;
    height: 24px;
    border: 2px solid var(--border-dark);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: all var(--transition-fast);
}

.quiz-option.selected .quiz-option-marker {
    border-color: var(--primary-color);
    background: var(--primary-color);
    color: white;
}

/* Ejercicio de completar espacios */
.fill-blank {
    line-height: 2.5;
}

.fill-blank-input {
    display: inline-block;
    min-width: 120px;
    padding: var(--spacing-xs) var(--spacing-sm);
    border: none;
    border-bottom: 2px dashed var(--primary-light);
    background: var(--bg-light);
    font-family: inherit;
    font-size: inherit;
    text-align: center;
    transition: all var(--transition-fast);
}

.fill-blank-input:focus {
    outline: none;
    border-bottom-style: solid;
    background: white;
}

.fill-blank-input.correct {
    border-color: var(--success-color);
    background: var(--success-light);
}

.fill-blank-input.incorrect {
    border-color: var(--error-color);
    background: var(--error-light);
}

/* Ejercicio de arrastrar y soltar */
.drag-drop-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
}

.drag-items {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--bg-light);
    border-radius: var(--border-radius-md);
    min-height: 100px;
}

.drag-item {
    padding: var(--spacing-sm) var(--spacing-md);
    background: white;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-md);
    cursor: grab;
    user-select: none;
    transition: all var(--transition-fast);
}

.drag-item:active {
    cursor: grabbing;
}

.drag-item.dragging {
    opacity: 0.5;
}

.drop-zone {
    padding: var(--spacing-md);
    border: 2px dashed var(--border-dark);
    border-radius: var(--border-radius-md);
    min-height: 100px;
    transition: all var(--transition-fast);
}

.drop-zone.drag-over {
    border-color: var(--primary-color);
    background: rgba(44, 82, 130, 0.05);
}

/* ==========================================================================
   Sidebar
   ========================================================================== */
.page-with-sidebar {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: var(--spacing-xl);
    min-height: calc(100vh - 200px);
}

.sidebar {
    background: white;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    padding: var(--spacing-lg);
    position: sticky;
    top: calc(var(--spacing-lg) + 80px);
    height: fit-content;
    max-height: calc(100vh - 120px);
    overflow-y: auto;
}

.sidebar-section {
    margin-bottom: var(--spacing-xl);
}

.sidebar-section:last-child {
    margin-bottom: 0;
}

.sidebar-title {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-light);
    margin-bottom: var(--spacing-md);
}

.sidebar-nav {
    list-style: none;
}

.sidebar-nav li {
    margin-bottom: var(--spacing-xs);
}

.sidebar-nav a {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-md);
    color: var(--text-secondary);
    font-size: 0.9375rem;
    transition: all var(--transition-fast);
}

.sidebar-nav a:hover {
    background: var(--bg-light);
    color: var(--primary-color);
}

.sidebar-nav a.active {
    background: var(--primary-color);
    color: white;
}

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 1024px) {
    .page-with-sidebar {
        grid-template-columns: 1fr;
    }

    .sidebar {
        position: relative;
        top: 0;
        max-height: none;
    }

    .hero-stats {
        flex-wrap: wrap;
        gap: var(--spacing-lg);
    }
}

@media (max-width: 768px) {
    .header-main .container {
        flex-wrap: wrap;
    }

    .nav-main {
        display: none;
        width: 100%;
        flex-direction: column;
        padding: var(--spacing-md) 0;
    }

    .nav-main.active {
        display: flex;
    }

    .nav-main a {
        width: 100%;
        padding: var(--spacing-md);
    }

    .nav-auth {
        margin-left: 0;
        width: 100%;
    }

    .menu-toggle {
        display: block;
    }

    .dropdown-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        background: rgba(255, 255, 255, 0.1);
        margin-top: var(--spacing-sm);
        border-radius: var(--border-radius-md);
    }

    .dropdown-menu a {
        color: white;
    }

    .hero-actions {
        flex-direction: column;
    }

    .hero-actions .btn {
        width: 100%;
    }

    .drag-drop-container {
        grid-template-columns: 1fr;
    }

    .calendar-day {
        aspect-ratio: auto;
        min-height: 60px;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 2rem;
    }

    .section {
        padding: var(--spacing-2xl) 0;
    }

    .sessions-grid {
        grid-template-columns: 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr;
    }

    .modal {
        margin: var(--spacing-md);
        max-height: calc(100vh - var(--spacing-xl));
    }
}

/* ==========================================================================
   Utilidades
   ========================================================================== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-primary { color: var(--primary-color); }
.text-secondary { color: var(--text-secondary); }
.text-success { color: var(--success-color); }
.text-error { color: var(--error-color); }
.text-warning { color: var(--warning-color); }

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

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mt-4 { margin-top: var(--spacing-xl); }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }
.mb-4 { margin-bottom: var(--spacing-xl); }

.p-0 { padding: 0; }
.p-1 { padding: var(--spacing-sm); }
.p-2 { padding: var(--spacing-md); }
.p-3 { padding: var(--spacing-lg); }
.p-4 { padding: var(--spacing-xl); }

.d-none { display: none; }
.d-block { display: block; }
.d-flex { display: flex; }
.d-grid { display: grid; }

.flex-column { flex-direction: column; }
.align-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: var(--spacing-sm); }
.gap-2 { gap: var(--spacing-md); }
.gap-3 { gap: var(--spacing-lg); }

.w-100 { width: 100%; }
.h-100 { height: 100%; }

.rounded { border-radius: var(--border-radius-md); }
.rounded-lg { border-radius: var(--border-radius-lg); }
.shadow { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }

/* Animaciones */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.animate-fade-in {
    animation: fadeIn var(--transition-base) ease-out;
}

.animate-slide-up {
    animation: slideUp var(--transition-base) ease-out;
}

.animate-pulse {
    animation: pulse 2s infinite;
}

/* Loader */
.loader {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Tooltip */
[data-tooltip] {
    position: relative;
}

[data-tooltip]::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--primary-dark);
    color: white;
    font-size: 0.75rem;
    border-radius: var(--border-radius-sm);
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-fast);
    pointer-events: none;
    z-index: 100;
}

[data-tooltip]:hover::after {
    opacity: 1;
    visibility: visible;
    bottom: calc(100% + 8px);
}

/* Scroll personalizado */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-light);
}

::-webkit-scrollbar-thumb {
    background: var(--border-dark);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-light);
}