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

:root {
    --primary-color: #3498db;
    --primary-dark: #2980b9;
    --secondary-color: #2c3e50;
    --accent-color: #e74c3c;
    --success-color: #2ecc71;
    --warning-color: #f39c12;
    --light-gray: #ecf0f1;
    --medium-gray: #bdc3c7;
    --dark-gray: #7f8c8d;
    --text-color: #333;
    --text-light: #fff;
    --shadow: 0 2px 10px rgba(0,0,0,0.1);
    --shadow-hover: 0 4px 15px rgba(0,0,0,0.15);
    --border-radius: 12px;
    --border-radius-sm: 8px;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: #f8f9fa;
    font-size: 16px;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 20px 15px;
}

/* Encabezado */
header {
    text-align: center;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--light-gray);
}

header h1 {
    color: var(--secondary-color);
    margin-bottom: 8px;
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    font-weight: 700;
}

header p {
    color: var(--dark-gray);
    font-size: clamp(0.9rem, 2.5vw, 1.1rem);
}

/* Botones */
.btn {
    display: inline-block;
    background-color: var(--primary-color);
    color: var(--text-light);
    padding: 12px 24px;
    text-decoration: none;
    border-radius: var(--border-radius-sm);
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1rem;
    font-weight: 600;
    text-align: center;
    min-height: 44px; /* Tamaño mínimo para touch */
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

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

.btn-back {
    color: var(--dark-gray);
    text-decoration: none;
    font-size: 0.9rem;
    padding: 8px 0;
    display: inline-flex;
    align-items: center;
    gap: 5px;
}

.btn-back:hover {
    color: var(--secondary-color);
}

.btn-prioridad {
    padding: 10px 14px;
    font-size: 1.1rem;
    background-color: var(--medium-gray);
    min-width: 44px;
    min-height: 44px;
}

.btn-completar {
    padding: 10px 14px;
    font-size: 1.1rem;
    background-color: var(--success-color);
    min-width: 44px;
    min-height: 44px;
}

.btn-completar:hover {
    background-color: #27ae60;
}

/* Navegación principal */
.main-nav {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-bottom: 30px;
}

.main-nav .btn {
    font-size: 0.9rem;
    padding: 14px 12px;
}

/* Pendientes principales */
.pendientes-principales {
    margin-bottom: 30px;
}

.pendientes-principales h2 {
    color: var(--secondary-color);
    margin-bottom: 20px;
    text-align: center;
    font-size: 1.4rem;
    font-weight: 600;
}

.pendientes-top {
    display: grid;
    grid-template-columns: 1fr;
    gap: 15px;
    margin-bottom: 30px;
}

.pendiente-top-card {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 20px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-hover);
    position: relative;
    overflow: hidden;
    min-height: 120px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.pendiente-top-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: rgba(255,255,255,0.3);
}

.pendiente-top-card h3 {
    font-size: 1.2rem;
    margin-bottom: 10px;
    font-weight: 600;
    line-height: 1.3;
}

.pendiente-top-card .prioridad-badge {
    background: rgba(255,255,255,0.2);
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    align-self: flex-start;
}

/* Estadísticas */
.stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-bottom: 30px;
}

.stat-card {
    background-color: white;
    padding: 20px 15px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    text-align: center;
    transition: transform 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-3px);
}

.stat-card h3 {
    font-size: 0.8rem;
    color: var(--dark-gray);
    margin-bottom: 8px;
    font-weight: 500;
}

.stat-card p {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--secondary-color);
}

/* Filtros */
.filters {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 25px;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 12px 18px;
    background-color: var(--light-gray);
    border: none;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: all 0.3s;
    font-size: 0.9rem;
    font-weight: 500;
    min-height: 44px;
    flex: 1;
    min-width: 80px;
    max-width: 120px;
}

.filter-btn.active {
    background-color: var(--primary-color);
    color: white;
    box-shadow: var(--shadow);
}

.filter-btn:not(.active):hover {
    background-color: #d5dbdb;
}

/* Lista de pendientes compacta */
.pendientes-lista-compacta {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.pendiente-compacto {
    background-color: white;
    padding: 16px;
    border-radius: var(--border-radius-sm);
    box-shadow: var(--shadow);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.3s ease;
    border-left: 4px solid transparent;
}

.pendiente-compacto:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-2px);
}

.pendiente-info-compacto {
    display: flex;
    align-items: center;
    gap: 12px;
    flex: 1;
    min-width: 0; /* Permite que el texto se trunque */
}

.prioridad-indicador {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: bold;
    color: white;
    flex-shrink: 0;
}

.prioridad-8-10 { background-color: var(--accent-color); border-left-color: var(--accent-color); }
.prioridad-6-7 { background-color: var(--warning-color); border-left-color: var(--warning-color); }
.prioridad-4-5 { background-color: #f1c40f; border-left-color: #f1c40f; }
.prioridad-1-3 { background-color: var(--success-color); border-left-color: var(--success-color); }

.pendiente-titulo {
    font-weight: 500;
    color: var(--secondary-color);
    font-size: 1rem;
    line-height: 1.3;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.pendiente-compacto.completado .pendiente-titulo {
    text-decoration: line-through;
    color: var(--dark-gray);
}

.pendiente-acciones-compacto {
    display: flex;
    gap: 8px;
    align-items: center;
    flex-shrink: 0;
}

.valor-prioridad {
    background-color: var(--light-gray);
    padding: 6px 10px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: bold;
    color: var(--secondary-color);
    min-width: 36px;
    text-align: center;
}

/* Formulario */
.form-pendiente {
    background-color: white;
    padding: 25px 20px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    margin-bottom: 30px;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--secondary-color);
    font-size: 1rem;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid var(--light-gray);
    border-radius: var(--border-radius-sm);
    font-family: inherit;
    font-size: 1rem;
    transition: border-color 0.3s ease;
    background-color: #fff;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

/* Rango de prioridad */
.prioridad-rango {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 8px;
}

.prioridad-min,
.prioridad-max {
    color: var(--dark-gray);
    font-size: 0.85rem;
    font-weight: 500;
}

/* Acciones */
.actions {
    text-align: center;
    margin-top: 30px;
}

.actions .btn {
    width: 100%;
    max-width: 300px;
    margin: 0 auto;
}

/* Mensajes de estado */
.no-pendientes {
    text-align: center;
    color: var(--dark-gray);
    padding: 40px 20px;
    font-style: italic;
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

/* Mejoras para móviles específicas */
@media (max-width: 480px) {
    .container {
        padding: 15px 12px;
    }
    
    .main-nav {
        grid-template-columns: 1fr;
        gap: 10px;
    }
    
    .stats {
        grid-template-columns: 1fr;
        gap: 10px;
    }
    
    .stat-card {
        padding: 15px 12px;
    }
    
    .stat-card p {
        font-size: 1.3rem;
    }
    
    .filters {
        gap: 6px;
    }
    
    .filter-btn {
        padding: 10px 12px;
        font-size: 0.85rem;
        min-width: 70px;
    }
    
    .pendiente-compacto {
        padding: 14px 12px;
        flex-direction: column;
        align-items: stretch;
        gap: 12px;
    }
    
    .pendiente-info-compacto {
        width: 100%;
    }
    
    .pendiente-acciones-compacto {
        align-self: stretch;
        justify-content: space-between;
    }
    
    .form-pendiente {
        padding: 20px 15px;
    }
    
    .form-group input,
    .form-group textarea,
    .form-group select {
        padding: 12px 14px;
    }
}

/* Tablets */
@media (min-width: 768px) {
    .container {
        padding: 25px 20px;
    }
    
    .pendientes-top {
        grid-template-columns: repeat(3, 1fr);
        gap: 20px;
    }
    
    .main-nav {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
        max-width: 400px;
        margin-left: auto;
        margin-right: auto;
    }
    
    .stats {
        gap: 20px;
    }
    
    .filters {
        gap: 12px;
    }
    
    .filter-btn {
        flex: none;
        min-width: 100px;
    }
    
    .pendiente-compacto {
        padding: 18px 20px;
    }
}

/* Desktop */
@media (min-width: 1024px) {
    .container {
        padding: 30px;
    }
    
    .pendientes-top {
        gap: 25px;
    }
    
    .main-nav {
        max-width: 450px;
    }
}

/* Mejoras de accesibilidad */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Modo oscuro opcional */
@media (prefers-color-scheme: dark) {
    :root {
        --text-color: #ecf0f1;
        --secondary-color: #ecf0f1;
        --light-gray: #34495e;
        --medium-gray: #2c3e50;
        --dark-gray: #bdc3c7;
        background-color: #1a1a1a;
    }
    
    body {
        background-color: #1a1a1a;
        color: var(--text-color);
    }
    
    .stat-card,
    .form-pendiente,
    .pendiente-compacto {
        background-color: #2d3436;
        color: var(--text-color);
    }
    
    .form-group input,
    .form-group textarea,
    .form-group select {
        background-color: #2d3436;
        border-color: #4a5568;
        color: var(--text-color);
    }
    
    .valor-prioridad {
        background-color: #4a5568;
        color: var(--text-light);
    }
}

/* Estados de carga */
.loading {
    opacity: 0.7;
    pointer-events: none;
}

/* Mejoras para el formulario en móviles */
.form-pendiente input[type="date"] {
    /* Mejorar la experiencia de date picker en móviles */
    min-height: 48px;
}

/* Scroll suave */
html {
    scroll-behavior: smooth;
}

/* Prevenir zoom en inputs en iOS */
@media screen and (max-width: 768px) {
    input, select, textarea {
        font-size: 16px; /* Previene el zoom en iOS */
    }
}