:root {
    --primary-color: #ff9800;
    --primary-dark: #e68900;
    --bg-color: #f4f4f4;
    --white: #ffffff;
    --task-bg: #fff3e0;
    --completed-bg: #c8e6c9;
    --completed-text: #2e7d32;
    --shadow-color: rgba(0, 0, 0, 0.1);
}

/* Modo oscuro */
body.dark-mode {
    --bg-color: #121212;
    --white: #1e1e1e;
    --task-bg: #2e2e2e;
    --completed-bg: #1b5e20;
    --completed-text: #ffffff;
    --shadow-color: rgba(255, 255, 255, 0.1);
    color: #ffffff;
}

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

body {
    font-family: 'Segoe UI', Arial, sans-serif;
    background-color: var(--bg-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    padding: 20px;
    transition: background-color 0.3s ease;
}

.container {
    background: var(--white);
    padding: 2rem;
    box-shadow: 0 4px 12px var(--shadow-color);
    border-radius: 12px;
    width: 100%;
    max-width: 600px;
    transition: background-color 0.3s ease;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

h1 {
    color: var(--primary-color);
    margin: 0;
}

.dark-mode-toggle {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--primary-color);
    padding: 5px;
}

.input-group {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

input, select {
    padding: 12px;
    border: 2px solid var(--primary-color);
    border-radius: 6px;
    background-color: var(--white);
    color: inherit;
}

input {
    flex: 1;
}

select {
    width: 100px;
}

button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 12px 20px;
    cursor: pointer;
    border-radius: 6px;
    transition: all 0.3s ease;
}

button:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
}

ul {
    list-style: none;
    padding: 0;
}

li {
    background: var(--task-bg);
    margin: 8px 0;
    padding: 15px;
    border-radius: 8px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    animation: slideIn 0.3s ease;
    transition: all 0.3s ease;
}

li.completed {
    background: var(--completed-bg);
    color: var(--completed-text);
    text-decoration: line-through;
}

.task-actions {
    display: flex;
    gap: 10px;
}

.priority-badge {
    padding: 3px 8px;
    border-radius: 12px;
    font-size: 0.8rem;
    margin-left: 10px;
}

.priority-baja { background-color: #8bc34a; color: white; }
.priority-media { background-color: #ffc107; color: black; }
.priority-alta { background-color: #f44336; color: white; }

footer {
    margin-top: 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.task-counts {
    display: flex;
    gap: 20px;
}

.export-import {
    display: flex;
    gap: 10px;
}

.import-label {
    cursor: pointer;
    padding: 12px 20px;
    background-color: var(--primary-color);
    color: white;
    border-radius: 6px;
    transition: all 0.3s ease;
}

.notification {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background-color: var(--primary-color);
    color: white;
    padding: 10px 20px;
    border-radius: 5px;
    box-shadow: 0 4px 8px var(--shadow-color);
    animation: fadeInOut 3s ease;
}

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

@keyframes fadeInOut {
    0% { opacity: 0; transform: translateY(10px); }
    10%, 90% { opacity: 1; transform: translateY(0); }
    100% { opacity: 0; transform: translateY(10px); }
}

@media (max-width: 480px) {
    .input-group {
        flex-direction: column;
    }
    
    select {
        width: 100%;
    }
    
    footer {
        flex-direction: column;
        gap: 15px;
    }
}