:root {
    /* Colors - Dark Mode Default */
    --bg-dark: #0f172a;
    --bg-surface: rgba(30, 41, 59, 0.7);
    --border-color: rgba(255, 255, 255, 0.1);
    
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    --accent-primary: #3b82f6;
    --accent-secondary: #8b5cf6;
    --accent-glow: rgba(59, 130, 246, 0.5);
    
    --danger: #ef4444;
    --danger-glow: rgba(239, 68, 68, 0.5);
    --success: #10b981;
    --success-glow: rgba(16, 185, 129, 0.5);
    
    /* Priorities */
    --priority-high: #ef4444;
    --priority-med: #f59e0b;
    --priority-low: #3b82f6;

    /* Shadows & Effects */
    --glass-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    --hover-shadow: 0 10px 25px -5px rgba(59, 130, 246, 0.4);
    
    /* Layout */
    --radius: 16px;
    --radius-sm: 8px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    background-color: var(--bg-dark);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    overflow-x: hidden;
    padding: 2rem 1rem;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* Animated Background Shapes */
.bg-shape {
    position: fixed;
    border-radius: 50%;
    filter: blur(80px);
    z-index: -1;
    opacity: 0.5;
    animation: float 20s infinite alternate cubic-bezier(0.4, 0, 0.2, 1);
}
.shape-1 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, var(--accent-secondary), transparent);
    top: -10%;
    left: -10%;
}
.shape-2 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, var(--accent-primary), transparent);
    bottom: -15%;
    right: -10%;
    animation-delay: -5s;
}
.shape-3 {
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, #ec4899, transparent);
    top: 40%;
    left: 40%;
    opacity: 0.3;
    animation-delay: -10s;
}

@keyframes float {
    0% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(50px, 30px) scale(1.1); }
    100% { transform: translate(-30px, 60px) scale(0.9); }
}

/* Main Container - Glassmorphism */
.app-container {
    width: 100%;
    max-width: 600px;
    background: var(--bg-surface);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 2rem;
    box-shadow: var(--glass-shadow);
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    position: relative;
    z-index: 10;
}

/* Header */
.header-top {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: 0.5rem;
}
h1 {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, #fff, #94a3b8);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}
.clock-widget {
    text-align: right;
    display: flex;
    flex-direction: column;
}
#live-time {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}
#live-date {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.quote-section {
    font-style: italic;
    color: var(--text-secondary);
    font-size: 0.9rem;
    border-left: 3px solid var(--accent-primary);
    padding-left: 0.75rem;
    margin-bottom: 1rem;
    min-height: 2.5rem;
}

/* Progress Bar */
.progress-container {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}
.progress-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
}
.progress-bar-bg {
    width: 100%;
    height: 8px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
    overflow: hidden;
}
.progress-bar-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    border-radius: 4px;
    transition: width 0.5s ease-out;
    box-shadow: 0 0 10px var(--accent-glow);
}

/* Input Section */
.input-section form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    background: rgba(0, 0, 0, 0.2);
    padding: 1.25rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
}
.input-group input[type="text"] {
    width: 100%;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 1.1rem;
    outline: none;
}
.input-group input::placeholder {
    color: var(--text-muted);
}
.input-actions {
    display: flex;
    gap: 1rem;
    align-items: center;
    flex-wrap: wrap;
}
.action-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(255, 255, 255, 0.05);
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}
.action-item input[type="date"],
.action-item select {
    background: transparent;
    border: none;
    color: var(--text-primary);
    outline: none;
    font-size: 0.9rem;
    cursor: pointer;
}
/* Colorize calendar picker icon (WebKit) */
::-webkit-calendar-picker-indicator {
    filter: invert(1);
    cursor: pointer;
}
.action-item select option {
    background: var(--bg-dark);
    color: var(--text-primary);
}

/* Buttons */
.btn-primary {
    margin-left: auto;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: #fff;
    border: none;
    padding: 0.6rem 1.25rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    box-shadow: 0 4px 15px var(--accent-glow);
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(139, 92, 246, 0.6);
}
.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    padding: 0.4rem 0.8rem;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    cursor: pointer;
    transition: var(--transition);
}
.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--danger);
    border-color: var(--danger);
}

/* Controls */
.controls-section {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}
.search-box {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(255, 255, 255, 0.05);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    flex: 1;
    min-width: 200px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}
.search-box:focus-within {
    border-color: var(--accent-primary);
    box-shadow: 0 0 10px var(--accent-glow);
}
.search-box input {
    background: transparent;
    border: none;
    color: var(--text-primary);
    outline: none;
    width: 100%;
}
.filters {
    display: flex;
    gap: 0.5rem;
    background: rgba(255, 255, 255, 0.05);
    padding: 0.25rem;
    border-radius: 20px;
}
.filter-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 0.4rem 0.8rem;
    border-radius: 16px;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.9rem;
    font-weight: 500;
}
.filter-btn:hover {
    color: var(--text-primary);
}
.filter-btn.active {
    background: var(--text-primary);
    color: var(--bg-dark);
}

/* Task List */
.list-section {
    min-height: 200px;
    display: flex;
    flex-direction: column;
}
.task-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

/* Task Item */
.task-item {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 1rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    cursor: grab;
    animation: slideIn 0.3s ease-out forwards;
}
@keyframes slideIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}
.task-item.removing {
    animation: slideOut 0.3s ease-in forwards;
}
@keyframes slideOut {
    from { opacity: 1; transform: translateX(0); }
    to { opacity: 0; transform: translateX(50px); }
}
.task-item.dragging {
    opacity: 0.5;
    background: rgba(255, 255, 255, 0.1);
    box-shadow: var(--hover-shadow);
}
.task-item:hover {
    background: rgba(255, 255, 255, 0.08);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}
/* Priority Indicator */
.priority-indicator {
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
}
.task-item[data-priority="high"] .priority-indicator { background: var(--priority-high); box-shadow: 0 0 8px var(--priority-high); }
.task-item[data-priority="medium"] .priority-indicator { background: var(--priority-med); }
.task-item[data-priority="low"] .priority-indicator { background: var(--priority-low); }

/* Checkbox */
.checkbox-container {
    position: relative;
    width: 24px;
    height: 24px;
    flex-shrink: 0;
    cursor: pointer;
}
.checkbox-container input {
    opacity: 0;
    cursor: pointer;
    height: 0;
    width: 0;
}
.checkmark {
    position: absolute;
    top: 0;
    left: 0;
    height: 24px;
    width: 24px;
    background-color: transparent;
    border: 2px solid var(--text-secondary);
    border-radius: 50%;
    transition: var(--transition);
}
.checkbox-container:hover input ~ .checkmark {
    border-color: var(--accent-primary);
}
.checkbox-container input:checked ~ .checkmark {
    background-color: var(--success);
    border-color: var(--success);
    box-shadow: 0 0 10px var(--success-glow);
}
.checkmark:after {
    content: "";
    position: absolute;
    display: none;
    left: 8px;
    top: 4px;
    width: 5px;
    height: 10px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}
.checkbox-container input:checked ~ .checkmark:after {
    display: block;
}

/* Task Content */
.task-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    overflow: hidden;
}
.task-text {
    font-size: 1.05rem;
    color: var(--text-primary);
    transition: var(--transition);
    word-break: break-word;
}
.task-item.completed .task-text {
    text-decoration: line-through;
    color: var(--text-muted);
}
.task-meta {
    display: flex;
    gap: 0.75rem;
    font-size: 0.75rem;
    color: var(--text-secondary);
}
.task-meta i {
    margin-right: 0.25rem;
}
.due-date.overdue {
    color: var(--danger);
}

/* Task Actions */
.task-actions {
    display: flex;
    gap: 0.5rem;
    opacity: 0;
    transform: translateX(10px);
    transition: var(--transition);
}
.task-item:hover .task-actions {
    opacity: 1;
    transform: translateX(0);
}
.btn-icon {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: var(--transition);
}
.btn-icon:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}
.btn-icon.edit-btn:hover { color: var(--accent-primary); }
.btn-icon.delete-btn:hover { 
    color: var(--danger); 
    background: rgba(239, 68, 68, 0.1);
}

/* Empty State */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 3rem 1rem;
    text-align: center;
    opacity: 1;
    transition: opacity 0.3s;
}
.empty-state.hidden {
    display: none;
    opacity: 0;
}
.empty-img {
    width: 120px;
    margin-bottom: 1rem;
    opacity: 0.8;
    filter: drop-shadow(0 10px 15px rgba(0,0,0,0.3));
}
.empty-state p {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}
.empty-state span {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Footer */
.app-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: var(--bg-dark);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    transition: opacity 0.5s ease;
}
.loader {
    width: 50px;
    height: 50px;
    border: 3px solid rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    border-top-color: var(--accent-primary);
    animation: spin 1s ease-in-out infinite;
}
@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Confetti Canvas */
#confetti-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 10000;
}

/* Responsive */
@media (max-width: 600px) {
    .app-container {
        padding: 1.5rem;
    }
    .header-top {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
    .clock-widget {
        text-align: left;
    }
    .input-actions {
        flex-direction: column;
        align-items: stretch;
    }
    .btn-primary {
        justify-content: center;
    }
    .controls-section {
        flex-direction: column;
        align-items: stretch;
    }
    .filters {
        justify-content: center;
    }
    .task-actions {
        opacity: 1; /* Always visible on mobile */
        transform: none;
    }
}