:root {
    --primary: #FFD700; /* Dorado */
    --secondary: #000000; /* Negro */
    --pending: #666666; /* Gris oscuro */
    --in-progress: #FFD700; /* Dorado */
    --completed: #FFFFFF; /* Blanco */
    --bg: #000000; /* Negro sólido */
    --card-bg: #333333; /* Gris oscuro */
    --shadow: 0 10px 30px rgba(0,0,0,0.8);
    --shadow-hover: 0 15px 40px rgba(0,0,0,0.9);
    --border-radius: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    box-sizing: border-box;
}

body {
    font-family: 'Roboto', sans-serif;
    margin: 0;
    padding: 0;
    background: var(--bg);
    min-height: 100vh;
    color: #FFFFFF; /* Blanco para texto en fondo negro */
    line-height: 1.6;
    display: flex;
}

#sidebar-header {
    padding: 20px;
    background: var(--card-bg);
    border-bottom: 1px solid #555;
}

#global-actions {
    margin-top: 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

#global-actions .button-row {
    display: flex;
    gap: 10px;
}

#global-actions .import-row {
    display: flex;
    gap: 10px;
    align-items: center;
}

#global-actions button {
    background: var(--primary);
    color: #000000;
    border: none;
    padding: 8px 12px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 0.9em;
    flex: 1;
}

#global-actions .import-row button {
    flex: none;
    width: 120px;
    height: 40px;
}

#global-actions textarea {
    width: 100%;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    color: #FFFFFF;
    border: 1px solid #FFD700;
    border-radius: 5px;
    padding: 5px;
    resize: none;
    font-family: monospace;
    font-size: 0.8em;
    flex: 1;
}

#app {
    display: flex;
    width: 100vw;
    height: 100vh;
}

#sidebar {
    width: 300px;
    background: #000000; /* Negro */
    padding: 0;
    border-right: 2px solid #FFD700; /* Dorado más grueso */
    display: flex;
    flex-direction: column;
    height: 100vh;
    box-shadow: 2px 0 10px rgba(255, 215, 0, 0.2); /* Sombra dorada sutil */
}

#sidebar-content {
    flex: 1;
    padding: 20px;
    overflow-y: auto;
}

#sidebar-header {
    margin-bottom: 20px;
}

#sidebar-header h1 {
    margin-top: 0;
    color: var(--primary);
    font-size: 1.5em;
}

#add-category-sidebar {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

#category-list {
    list-style: none;
    padding: 0;
}

.category-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 15px;
    cursor: pointer;
    border-radius: 8px;
    margin-bottom: 8px;
    transition: var(--transition);
    border: 1px solid #FFD700; /* Dorado borde sutil */
    background: rgba(255, 215, 0, 0.05); /* Fondo dorado muy sutil */
}

.category-item.active {
    background: linear-gradient(45deg, #FFD700, #FFA500); /* Gradiente dorado */
    color: #000000; /* Negro */
    border-color: #FFD700;
    box-shadow: 0 4px 12px rgba(255, 215, 0, 0.4);
}

.category-item span {
    cursor: pointer;
    flex-grow: 1;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
}

.category-item:hover {
    background: rgba(255, 215, 0, 0.1); /* Fondo dorado más intenso en hover */
    border-color: #FFD700;
}

.category-item button {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 16px;
}

#main-content {
    flex: 1;
    padding: 20px;
    overflow-y: auto;
    background: var(--card-bg); /* Gris oscuro */
    color: #FFFFFF; /* Blanco */
}

#search-filter {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

#search-input, #filter-select {
    padding: 10px;
    border: 1px solid #FFD700;
    border-radius: 8px;
    background: #000000;
    color: #FFFFFF;
}

#search-input {
    flex: 1;
}

#filter-select {
    width: 200px;
}

.category-main {
    background-color: #2f2f2f; /* Tarjeta más oscura */
    padding: 25px;
    border-radius: var(--border-radius);
    box-shadow: 0 8px 30px rgba(0,0,0,0.7);
    border-left: 5px solid rgba(255,215,0,0.14);
    transition: var(--transition);
}

.category-main h2 {
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
    margin-top: 0;
    color: var(--primary);
    font-size: 1.8em;
    font-weight: 500;
    border-bottom: 3px solid #f0f0f0;
    padding-bottom: 15px;
    margin-bottom: 20px;
}

.category-main.mostly-pending {
    background: linear-gradient(135deg, rgba(80,80,80,0.35), rgba(60,60,60,0.2));
    border-left-color: rgba(102,102,102,0.9);
}

.category-main.mostly-in-progress {
    background: linear-gradient(135deg, rgba(80,70,0,0.2), rgba(60,50,0,0.12));
    border-left-color: rgba(255,215,0,0.9);
}

.category-main.mostly-completed {
    background: linear-gradient(135deg, rgba(50,60,50,0.2), rgba(40,50,40,0.12));
    border-left-color: rgba(200,200,200,0.6);
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.category {
    background-color: #fff;
    margin: 25px 0;
    padding: 25px;
    border-radius: var(--border-radius);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    border-left: 5px solid var(--primary);
    transition: var(--transition);
    animation: fadeIn 0.6s ease;
}

.category:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-hover);
}

.category.mostly-pending {
    background: linear-gradient(135deg, rgba(108, 117, 125, 0.1), rgba(108, 117, 125, 0.05));
    border-left-color: var(--pending);
}

.category.mostly-in-progress {
    background: linear-gradient(135deg, rgba(0, 123, 255, 0.1), rgba(0, 123, 255, 0.05));
    border-left-color: var(--in-progress);
}

.category.mostly-completed {
    background: linear-gradient(135deg, rgba(40, 167, 69, 0.1), rgba(40, 167, 69, 0.05));
    border-left-color: var(--completed);
}

.category h2 {
    margin-top: 0;
    color: var(--primary);
    font-size: 1.8em;
    font-weight: 500;
    border-bottom: 3px solid #f0f0f0;
    padding-bottom: 15px;
    margin-bottom: 20px;
}

.add-task {
    display: flex;
    gap: 15px;
    margin-bottom: 20px;
    align-items: center;
}

.add-task input {
    flex-grow: 1;
}

input[type="text"] {
    padding: 15px 20px;
    width: 100%;
    border: 2px solid #FFD700; /* Dorado */
    border-radius: 25px;
    font-size: 16px;
    font-family: 'Roboto', sans-serif;
    transition: var(--transition);
    background: var(--card-bg); /* Gris oscuro */
    color: #FFFFFF; /* Blanco */
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.1);
}

input[type="text"]:focus {
    outline: none;
    border-color: #FFD700;
    box-shadow: 0 0 15px rgba(255, 215, 0, 0.5), inset 0 2px 4px rgba(0,0,0,0.1); /* Dorado shadow */
    background: var(--card-bg); /* Gris oscuro */
}

button {
    padding: 12px 20px;
    background: linear-gradient(45deg, #FFD700, #FFA500); /* Gradiente dorado */
    color: #FFFFFF; /* Texto blanco */
    border: none;
    border-radius: 20px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    font-family: 'Roboto', sans-serif;
    transition: var(--transition);
    box-shadow: 0 6px 20px rgba(255, 215, 0, 0.18); /* Dorado sutil */
    display: flex;
    align-items: center;
    gap: 8px;
}

button:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(255, 215, 0, 0.28);
    background: linear-gradient(45deg, #FFB500, #FFD700);
}

.task {
    display: flex;
    flex-direction: column;
    margin: 12px 0;
    padding: 15px;
    border-radius: 10px;
    transition: var(--transition);
    border: 1px solid #FFD700; /* Dorado borde */
    background: var(--card-bg); /* Gris oscuro */
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.task:hover {
    background-color: #555555; /* Gris más claro */
    box-shadow: 0 4px 15px rgba(255, 215, 0, 0.2);
    border-color: #FFD700;
}

.task span {
    font-size: 16px;
    font-weight: 400;
    white-space: normal;
    word-break: break-word;
    overflow-wrap: anywhere;
    margin-bottom: 10px;
}

.task-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.pending {
    background: rgba(80, 80, 80, 0.45); /* Gris oscuro */
    border-left: 4px solid rgba(180,180,180,0.18);
}

.in-progress {
    background: rgba(120, 90, 0, 0.22); /* Dorado tenue sobre oscuro */
    border-left: 4px solid rgba(255,215,0,0.22);
}

.completed {
    background: rgba(70, 70, 70, 0.36); /* Gris medio */
    color: #FFFFFF; /* Texto blanco */
    border-left: 4px solid rgba(200,200,200,0.12);
}

.completed span {
    text-decoration: line-through;
    color: #6c757d;
    font-weight: 300;
}

.status-buttons {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.status-btn {
    padding: 8px 15px;
    border: 2px solid transparent;
    border-radius: 20px;
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 5px;
    min-width: 100px;
    justify-content: center;
    background: var(--card-bg); /* Gris oscuro */
    color: #FFFFFF; /* Blanco */
}

.pending-btn {
    background-color: #666666;
    color: #FFFFFF;
    border-color: #666666;
}

.in-progress-btn {
    background: linear-gradient(45deg, #FFD700, #FFA500);
    color: #000000;
    border-color: #FFD700;
}

.completed-btn {
    background-color: #FFFFFF;
    color: #000000;
    border-color: #FFD700;
}

.status-btn.active {
    box-shadow: 0 0 15px rgba(255, 215, 0, 0.5);
    transform: scale(1.05);
    font-weight: 600;
    border-color: #FFD700;
}

.status-btn:hover {
    opacity: 0.85;
    transform: scale(1.02);
}

#sidebar-header h1 {
    color: var(--primary);
    margin-bottom: 10px;
    font-size: 1.8em;
    font-weight: 700;
    letter-spacing: -1px;
}

#sidebar-header p {
    color: #CCCCCC; /* Gris claro para fondo negro */
    font-size: 1em;
    font-weight: 300;
    margin: 0;
}

@media (max-width: 768px) {
    #app {
        flex-direction: column;
        height: auto;
    }
    #sidebar {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid #e0e0e0;
    }
    #main-content {
        padding: 20px;
    }
    h1 {
        font-size: 2.2em;
    }
    .category {
        padding: 20px;
    }
    .add-task {
        flex-direction: column;
        align-items: stretch;
    }
    .status-buttons {
        justify-content: center;
    }
    .status-btn {
        flex: 1;
        min-width: 80px;
    }
}

.category.collapsed .category-content {
    display: none;
}

.category-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

/* Scrollbar Styles */
::-webkit-scrollbar {
    width: 12px;
}

::-webkit-scrollbar-track {
    background: #333333; /* Gris oscuro */
    border-radius: 6px;
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(45deg, #FFD700, #FFA500); /* Gradiente dorado */
    border-radius: 6px;
    border: 2px solid #333333; /* Borde para que no se vea cortado */
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(45deg, #FFB500, #FFD700); /* Dorado más claro en hover */
}

/* Modal Styles */
.modal {
    display: flex;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    justify-content: center;
    align-items: center;
}

.modal-content {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 15px;
    border: 2px solid var(--primary);
    box-shadow: var(--shadow);
    text-align: center;
    max-width: 400px;
    width: 90%;
}

.modal-content h2 {
    color: var(--primary);
    margin-bottom: 15px;
}

.modal-content p {
    color: #FFFFFF;
    margin-bottom: 20px;
}

.modal-content input {
    width: 100%;
    padding: 12px;
    border: 2px solid var(--primary);
    border-radius: 8px;
    background: #000000;
    color: #FFFFFF;
    font-size: 16px;
    margin-bottom: 20px;
}

.modal-content button {
    background: linear-gradient(45deg, #FFD700, #FFA500);
    color: #000000;
    border: none;
    padding: 12px 24px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
    font-weight: bold;
    transition: var(--transition);
}

.modal-content button:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(255, 215, 0, 0.4);
}

.category-actions {
    display: flex;
    gap: 5px;
}

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

.stats-container {
    display: flex;
    justify-content: space-around;
    background: #2b2b2b; /* oscuro */
    padding: 15px;
    border-radius: 10px;
    margin-bottom: 20px;
    box-shadow: 0 6px 25px rgba(0,0,0,0.6);
    flex-wrap: wrap;
    gap: 10px;
    color: #FFD700; /* dorado para texto */
}

.stats-container span {
    font-weight: 600;
    color: #FFD700; /* dorado para destacar */
}