:root {
    /* Dark Theme (Default) */
    --bg-main: #0f172a;
    --bg-secondary: #1e293b;
    --bg-card: rgba(30, 41, 59, 0.9);
    --bg-hover: rgba(51, 65, 85, 0.8);
    --border-color: rgba(255, 255, 255, 0.1);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --accent-color: #8b5cf6;
    --danger-color: #ef4444;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    
    /* Kanban Column colors */
    --col-todo: #64748b;
    --col-progress: #3b82f6;
    --col-done: #10b981;
    
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.5);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.5);
    
    --radius-md: 12px;
    --radius-lg: 16px;
}

[data-theme="light"] {
    --bg-main: #f8fafc;
    --bg-secondary: #f1f5f9;
    --bg-card: #ffffff;
    --bg-hover: #e2e8f0;
    --border-color: rgba(0, 0, 0, 0.1);
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1);
}

* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Inter', sans-serif; }

body {
    background-color: var(--bg-main);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Custom Scrollbar */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-color); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-secondary); }

.app-wrapper {
    display: flex;
    flex-direction: column;
    height: 100vh;
    max-width: 1600px;
    margin: 0 auto;
    padding: 20px;
}

/* Navbar */
.top-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 25px;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    margin-bottom: 25px;
    backdrop-filter: blur(10px);
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    width: 40px; height: 40px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-radius: 10px;
    display: flex; align-items: center; justify-content: center;
    color: white; font-size: 1.2rem;
}

.brand h1 { font-size: 1.5rem; font-weight: 800; }
.brand h1 span { color: var(--primary-color); }

.nav-actions {
    display: flex;
    align-items: center;
    gap: 20px;
}

.action-group {
    display: flex; gap: 10px;
    border-right: 1px solid var(--border-color);
    padding-right: 20px;
}

.icon-btn {
    background: transparent; border: none;
    color: var(--text-secondary);
    font-size: 1.2rem; cursor: pointer;
    width: 40px; height: 40px;
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    transition: all 0.2s;
}
.icon-btn:hover { background: var(--bg-hover); color: var(--text-primary); }

.primary-btn, .secondary-btn {
    padding: 10px 20px;
    border-radius: 10px; border: none;
    font-weight: 600; cursor: pointer;
    display: flex; align-items: center; gap: 8px;
    transition: all 0.2s; font-size: 0.95rem;
}

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

.secondary-btn {
    background: transparent; color: var(--text-primary);
    border: 1px solid var(--border-color);
}
.secondary-btn:hover { background: var(--bg-hover); }
.btn-small { padding: 6px 12px; font-size: 0.85rem; }

/* Tooltips */
.tooltip { position: relative; }
.tooltip::after {
    content: attr(data-tooltip);
    position: absolute; bottom: -30px; left: 50%; transform: translateX(-50%);
    background: var(--text-primary); color: var(--bg-main);
    padding: 4px 8px; border-radius: 4px; font-size: 0.75rem;
    opacity: 0; pointer-events: none; transition: opacity 0.2s;
    white-space: nowrap; font-weight: 600; z-index: 10;
}
.tooltip:hover::after { opacity: 1; }

/* Kanban Board */
.kanban-board {
    display: flex;
    gap: 25px;
    flex: 1;
    overflow-x: auto;
    padding-bottom: 20px;
}

.kanban-column {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    min-width: 320px; width: 320px;
    display: flex; flex-direction: column;
    height: 100%;
}

.kanban-column.drag-over {
    background: var(--bg-hover);
    border: 2px dashed var(--primary-color);
}

.column-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
}

.column-header h2 {
    font-size: 1.1rem; display: flex; align-items: center; gap: 10px;
}

.dot { width: 12px; height: 12px; border-radius: 50%; }
.dot-todo { background: var(--col-todo); }
.dot-progress { background: var(--col-progress); }
.dot-done { background: var(--col-done); }

.task-count {
    margin-left: auto;
    background: var(--bg-hover);
    padding: 2px 8px; border-radius: 12px;
    font-size: 0.8rem; color: var(--text-secondary);
}

.task-container {
    padding: 15px;
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

/* Task Card */
.task-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 15px;
    cursor: grab;
    box-shadow: var(--shadow-sm);
    transition: all 0.2s;
    position: relative;
    border-left: 4px solid transparent;
}

.task-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.task-card:active { cursor: grabbing; }
.task-card.dragging { opacity: 0.5; transform: scale(0.95); }

/* Priority borders */
.task-card[data-priority="Rendah"] { border-left-color: var(--success-color); }
.task-card[data-priority="Sedang"] { border-left-color: var(--warning-color); }
.task-card[data-priority="Tinggi"] { border-left-color: var(--danger-color); }

.task-header { display: flex; justify-content: space-between; margin-bottom: 10px; }
.task-cat { font-size: 0.75rem; background: var(--bg-hover); padding: 2px 8px; border-radius: 12px; font-weight: 600;}
.task-actions-btn { display: flex; gap: 5px; opacity: 0; transition: opacity 0.2s; }
.task-card:hover .task-actions-btn { opacity: 1; }
.task-actions-btn button { background: transparent; border: none; color: var(--text-secondary); cursor: pointer; }
.task-actions-btn button:hover { color: var(--primary-color); }

.task-title { font-weight: 600; font-size: 1.05rem; margin-bottom: 12px; word-break: break-word; line-height: 1.4;}

/* Subtasks inside card */
.subtask-list {
    display: flex; flex-direction: column; gap: 6px; margin-bottom: 15px;
}
.subtask-item {
    display: flex; align-items: flex-start; gap: 8px; font-size: 0.85rem; color: var(--text-secondary);
}
.subtask-item input[type="checkbox"] { margin-top: 3px; cursor: pointer; }
.subtask-item.checked span { text-decoration: line-through; opacity: 0.6; }

/* Pomodoro Area */
.task-footer {
    display: flex; justify-content: space-between; align-items: center;
    border-top: 1px solid var(--border-color); padding-top: 12px;
}

.due-date { font-size: 0.8rem; color: var(--text-secondary); display: flex; align-items: center; gap: 5px; }
.due-date.overdue { color: var(--danger-color); font-weight: 600; }

.pomo-start-btn {
    background: rgba(239, 68, 68, 0.1); color: var(--danger-color);
    border: 1px solid rgba(239, 68, 68, 0.3); border-radius: 8px;
    padding: 5px 10px; font-size: 0.8rem; cursor: pointer; font-weight: 600;
    transition: all 0.2s; display: flex; align-items: center; gap: 5px;
}
.pomo-start-btn:hover { background: var(--danger-color); color: white; }

/* Modals */
.modal-overlay {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.6); backdrop-filter: blur(5px);
    display: flex; justify-content: center; align-items: center;
    z-index: 1000; opacity: 0; pointer-events: none; transition: opacity 0.3s;
}
.modal-overlay.show { opacity: 1; pointer-events: auto; }

.modal-content {
    background: var(--bg-card); border: 1px solid var(--border-color);
    border-radius: var(--radius-lg); width: 90%; max-width: 500px;
    transform: translateY(20px); transition: transform 0.3s;
    box-shadow: var(--shadow-lg); max-height: 90vh; display: flex; flex-direction: column;
}
.modal-overlay.show .modal-content { transform: translateY(0); }

.modal-header, .modal-footer { padding: 20px; }
.modal-header { border-bottom: 1px solid var(--border-color); display: flex; justify-content: space-between; align-items: center; }
.modal-footer { border-top: 1px solid var(--border-color); display: flex; justify-content: flex-end; gap: 10px; }
.close-modal { background: transparent; border: none; color: var(--text-secondary); font-size: 1.2rem; cursor: pointer; }

.modal-body { padding: 20px; overflow-y: auto; display: flex; flex-direction: column; gap: 15px; }
.form-group { display: flex; flex-direction: column; gap: 8px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 15px; }
.form-group label { font-size: 0.85rem; color: var(--text-secondary); font-weight: 600; }
.form-group input, .form-group select {
    background: var(--bg-secondary); border: 1px solid var(--border-color);
    padding: 12px; border-radius: 8px; color: var(--text-primary); outline: none; font-size: 0.95rem;
}
.form-group input:focus, .form-group select:focus { border-color: var(--primary-color); }

/* Dynamic Subtask inputs */
.subtask-input-row { display: flex; gap: 10px; margin-bottom: 10px; }
.subtask-input-row input { flex: 1; }
.remove-subtask { background: rgba(239, 68, 68, 0.1); border: none; color: var(--danger-color); border-radius: 8px; width: 40px; cursor: pointer;}

/* Floating Pomodoro Widget */
.pomodoro-widget {
    position: fixed; bottom: 30px; right: 30px;
    background: linear-gradient(135deg, #ef4444, #f59e0b);
    border-radius: var(--radius-lg); padding: 15px 25px;
    box-shadow: 0 10px 25px rgba(239, 68, 68, 0.4);
    display: flex; align-items: center; gap: 20px;
    color: white; transform: translateY(100px); opacity: 0; pointer-events: none;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275); z-index: 100;
}
.pomodoro-widget.active { transform: translateY(0); opacity: 1; pointer-events: auto; }

.pomo-info { display: flex; flex-direction: column; }
.pomo-task-name { font-size: 0.8rem; opacity: 0.9; max-width: 150px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; font-weight: 600;}
.pomo-time { font-size: 2rem; font-weight: 800; font-variant-numeric: tabular-nums; line-height: 1; margin-top: 5px;}
.pomo-actions { display: flex; gap: 10px; }
.pomo-btn {
    background: rgba(255, 255, 255, 0.2); color: white;
    width: 45px; height: 45px; border-radius: 50%;
}
.pomo-btn:hover { background: rgba(255, 255, 255, 0.3); transform: scale(1.05); }

/* Responsive Enhancements */
@media (max-width: 900px) {
    /* Stack form inputs vertically on smaller screens */
    .form-row { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
    .app-wrapper { padding: 10px; height: 100vh; overflow: hidden; }
    
    .top-nav { 
        padding: 10px 15px; 
        margin-bottom: 15px; 
        flex-wrap: wrap; 
        justify-content: center; 
        gap: 10px;
    }
    
    .brand h1 { font-size: 1.2rem; }
    .action-group { padding-right: 10px; }
    .icon-btn { width: 35px; height: 35px; font-size: 1rem; }
    .primary-btn { padding: 8px 12px; font-size: 0.85rem; }
    
    /* Horizontal snap-scrolling for Kanban (Native App feel) */
    .kanban-board { 
        padding-bottom: 15px;
        scroll-snap-type: x mandatory;
        scroll-padding: 10px;
        -webkit-overflow-scrolling: touch;
        gap: 15px;
    }
    
    .kanban-column { 
        min-width: 85vw; /* Takes up 85% width so the next column peeks out */
        scroll-snap-align: center;
        height: calc(100vh - 160px); /* Fits exactly on screen */
    }
    
    .pomodoro-widget { 
        bottom: 15px; right: 15px; left: 15px; 
        padding: 12px 20px;
        justify-content: space-between;
    }
    
    .pomo-time { font-size: 1.5rem; }
    .pomo-btn { width: 40px; height: 40px; }
    
    .modal-content { width: 95%; padding: 10px; margin: 10px; }
    .modal-header, .modal-footer, .modal-body { padding: 15px; }
}