/* ===================================
   CLOUDTASKS - DISEÑO LIMPIO Y PROFESIONAL
   =================================== */

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

:root {
    --primary-color: #3498db;
    --secondary-color: #2ecc71;
    --danger-color: #e74c3c;
    --warning-color: #f39c12;
    --light-gray: #ecf0f1;
    --dark-gray: #34495e;
    --border-radius: 8px;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 4px 15px rgba(0, 0, 0, 0.15);
    --transition: all 0.2s ease;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--dark-gray);
    line-height: 1.6;
    min-height: 100vh;
}

/* ===================================
   CONTENEDOR PRINCIPAL
   =================================== */

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* ===================================
   HEADER
   =================================== */

.header {
    background: white;
    padding: 30px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    margin-bottom: 30px;
    text-align: center;
}

.header h1 {
    font-size: 2.5em;
    color: var(--primary-color);
    margin-bottom: 10px;
    font-weight: 700;
}

.subtitle {
    color: var(--dark-gray);
    font-size: 1.1em;
}

/* ===================================
   CONTENIDO PRINCIPAL
   =================================== */

.main-content {
    flex: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    grid-template-areas:
        "form filters"
        "tasks tasks";
}

/* ===================================
   SECCIÓN DE FORMULARIO
   =================================== */

.form-section {
    background: white;
    padding: 30px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    grid-area: form;
}

.form-section h2 {
    color: var(--dark-gray);
    margin-bottom: 20px;
    font-size: 1.5em;
    border-bottom: 3px solid var(--primary-color);
    padding-bottom: 10px;
    font-weight: 700;
}

.task-form {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--dark-gray);
    font-size: 0.9em;
}

.form-group input,
.form-group textarea,
.form-group select {
    padding: 12px;
    border: 2px solid var(--light-gray);
    border-radius: var(--border-radius);
    font-family: inherit;
    font-size: 1em;
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 5px rgba(52, 152, 219, 0.2);
}

.form-group textarea {
    resize: vertical;
    min-height: 80px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

.error {
    color: var(--danger-color);
    font-size: 0.9em;
    margin-top: 5px;
    display: none;
    font-weight: 500;
}

.error.show {
    display: block;
}

.success-message {
    color: var(--secondary-color);
    font-size: 0.9em;
    margin-top: 5px;
    display: none;
    font-weight: 600;
}

.success-message.show {
    display: block;
}

/* ===================================
   BOTONES
   =================================== */

.btn {
    padding: 12px 20px;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1em;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

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

.btn-primary:hover {
    background: #2980b9;
    box-shadow: var(--shadow-hover);
}

.btn-primary:active {
    transform: scale(0.98);
}

.btn-sm {
    padding: 8px 12px;
    font-size: 0.85em;
}

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

.btn-success:hover {
    background: #27ae60;
    box-shadow: var(--shadow-hover);
}

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

.btn-danger:hover {
    background: #c0392b;
    box-shadow: var(--shadow-hover);
}

/* ===================================
   SECCIÓN DE FILTROS
   =================================== */

.filters-section {
    background: white;
    padding: 20px 30px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    grid-area: filters;
}

.filters-section h2 {
    color: var(--dark-gray);
    margin-bottom: 15px;
    font-size: 1.5em;
    border-bottom: 3px solid var(--secondary-color);
    padding-bottom: 10px;
    font-weight: 700;
}

.filters {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-bottom: 15px;
}

.search-box {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid var(--light-gray);
    border-radius: var(--border-radius);
    font-size: 1em;
    transition: var(--transition);
}

.search-box:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 5px rgba(52, 152, 219, 0.2);
}


.filter-buttons {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 8px 16px;
    border: 2px solid var(--light-gray);
    background: white;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    font-weight: 600;
    color: var(--dark-gray);
    font-size: 0.9em;
}

.filter-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background: rgba(52, 152, 219, 0.05);
}

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

.tasks-stats {
    display: flex;
    gap: 20px;
    font-size: 0.95em;
    color: var(--dark-gray);
    background: #f8f9fa;
    padding: 15px;
    border-radius: var(--border-radius);
    border-left: 4px solid var(--primary-color);
}

.tasks-stats strong {
    color: var(--primary-color);
    font-weight: 700;
}

/* ===================================
   SECCIÓN DE TAREAS
   =================================== */

.tasks-section {
    background: white;
    padding: 30px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    grid-area: tasks;
}

.tasks-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.empty-message {
    text-align: center;
    color: #95a5a6;
    padding: 40px 20px;
    font-size: 1.1em;
}

/* ===================================
   TARJETA DE TAREA
   =================================== */

.task-card {
    background: white;
    border: 2px solid var(--light-gray);
    border-radius: var(--border-radius);
    padding: 15px;
    transition: var(--transition);
    display: flex;
    gap: 15px;
    align-items: flex-start;
}

.task-card:hover {
    box-shadow: var(--shadow-hover);
    border-color: var(--primary-color);
}

.task-card.completed {
    background: #f8f9fa;
    opacity: 0.7;
}

.task-checkbox {
    width: 24px;
    height: 24px;
    cursor: pointer;
    margin-top: 2px;
    flex-shrink: 0;
}

.task-content {
    flex: 1;
}

.task-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 8px;
}

.task-title {
    font-size: 1.1em;
    font-weight: 600;
    color: var(--dark-gray);
    margin: 0;
}

.task-card.completed .task-title {
    text-decoration: line-through;
    color: #95a5a6;
}

.priority-badge {
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.75em;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.priority-alta {
    background: #ffe5e5;
    color: var(--danger-color);
}

.priority-media {
    background: #fff3e0;
    color: var(--warning-color);
}

.priority-baja {
    background: #e8f5e9;
    color: var(--secondary-color);
}

.task-description {
    color: #7f8c8d;
    font-size: 0.95em;
    margin: 8px 0;
}

.task-meta {
    display: flex;
    gap: 20px;
    font-size: 0.85em;
    color: #95a5a6;
}

.task-meta-item {
    display: flex;
    align-items: center;
    gap: 5px;
}

.task-actions {
    display: flex;
    gap: 8px;
    flex-shrink: 0;
}

.task-actions .btn {
    padding: 6px 10px;
    font-size: 0.8em;
}

.task-date-badge {
    display: inline-block;
    background: var(--light-gray);
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.8em;
}

.task-date-overdue {
    background: #ffe5e5;
    color: var(--danger-color);
    font-weight: 600;
}

/* ===================================
   FOOTER
   =================================== */

.footer {
    background: rgba(255, 255, 255, 0.9);
    color: var(--dark-gray);
    text-align: center;
    padding: 20px;
    border-radius: var(--border-radius);
    margin-top: auto;
    font-size: 0.9em;
}

/* ===================================
   RESPONSIVE DESIGN
   =================================== */

@media (max-width: 768px) {
    .container {
        padding: 10px;
    }

    .header {
        padding: 20px;
    }

    .header h1 {
        font-size: 2em;
    }

    .main-content {
        grid-template-columns: 1fr;
        grid-template-areas:
            "form"
            "filters"
            "tasks";
    }

    .form-section,
    .filters-section,
    .tasks-section {
        padding: 20px;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .filter-buttons {
        flex-direction: column;
    }

    .filter-btn {
        width: 100%;
    }

    .task-card {
        flex-direction: column;
    }

    .task-actions {
        width: 100%;
        justify-content: flex-end;
    }

    .tasks-stats {
        flex-direction: column;
        gap: 10px;
    }
}

@media (max-width: 480px) {
    .header h1 {
        font-size: 1.5em;
    }

    .form-section h2,
    .filters-section h2 {
        font-size: 1.2em;
    }

    .task-meta {
        flex-direction: column;
        gap: 8px;
    }

    .btn {
        padding: 10px 15px;
        font-size: 0.9em;
    }
}

/* ===================================
   ANIMACIONES SUTILES
   =================================== */

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

.task-card {
    animation: slideIn 0.3s ease;
}

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

.task-card.deleting {
    animation: fadeOut 0.3s ease;
}