/* CSS Reset & Variables */
:root {
    --primary-hue: 250;
    --primary-sat: 85%;
    --primary-light: 65%;

    --bg-gradient-1: #0f172a;
    --bg-gradient-2: #1e293b;
    --bg-gradient-3: #334155;

    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);

    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --accent-color: hsl(var(--primary-hue), var(--primary-sat), var(--primary-light));
    --accent-hover: hsl(var(--primary-hue), var(--primary-sat), 55%);

    --success-color: #22c55e;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --info-color: #3b82f6;

    --priority-high: #f43f5e;
    --priority-mid: #f59e0b;
    --priority-low: #10b981;

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);

    /* Indentation Line Colors per level */
    --level-1: #ef4444;
    --level-2: #f97316;
    --level-3: #f59e0b;
    --level-4: #84cc16;
    --level-5: #10b981;
    --level-6: #06b6d4;
    --level-7: #3b82f6;
    --level-8: #8b5cf6;
}

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

body {
    background: radial-gradient(circle at 10% 20%, rgb(15, 23, 42) 0%, rgb(30, 41, 59) 90%);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding-top: 2rem;
    overflow-x: hidden;
}

/* Background Animated Orbs */
.background-globes {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    z-index: -1;
    overflow: hidden;
    pointer-events: none;
}

.globe {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.5;
    animation: float 15s infinite ease-in-out alternate;
}

.globe-1 {
    width: 500px;
    height: 500px;
    background: linear-gradient(135deg, #6366f1, #8b5cf6);
    top: -150px;
    left: -150px;
}

.globe-2 {
    width: 400px;
    height: 400px;
    background: linear-gradient(135deg, #3b82f6, #06b6d4);
    bottom: -100px;
    right: -100px;
    animation-delay: -5s;
}

@keyframes float {
    0% {
        transform: translate(0, 0);
    }

    100% {
        transform: translate(30px, 50px);
    }
}

/* App Container */
.app-container {
    width: 95%;
    max-width: 800px;
    /* Wider for nested tasks */
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    box-shadow: var(--glass-shadow);
    padding: 2rem;
    margin-bottom: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.logo-icon {
    width: 44px;
    height: 44px;
    background: var(--accent-color);
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    color: white;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

h1 {
    font-size: 1.75rem;
    font-weight: 700;
    background: linear-gradient(to right, #fff, #cbd5e1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Toggle Switch */
.toggle-switch {
    display: flex;
    align-items: center;
    cursor: pointer;
    font-size: 0.9rem;
    gap: 0.5rem;
    color: var(--text-secondary);
}

.toggle-switch input {
    display: none;
}

.slider {
    position: relative;
    width: 40px;
    height: 22px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    transition: var(--transition);
}

.slider:before {
    content: "";
    position: absolute;
    height: 16px;
    width: 16px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    border-radius: 50%;
    transition: var(--transition);
}

input:checked+.slider {
    background-color: var(--accent-color);
}

input:checked+.slider:before {
    transform: translateX(18px);
}

button#add-btn:active {
    transform: translateY(0);
}

/* AI Magic Button */
.magic-btn {
    padding: 0 1.5rem;
    background: linear-gradient(135deg, #8b5cf6, #d946ef);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-family: inherit;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
    box-shadow: 0 4px 12px rgba(139, 92, 246, 0.3);
    position: relative;
    overflow: hidden;
}

.magic-btn:hover {
    background: linear-gradient(135deg, #7c3aed, #c026d3);
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(139, 92, 246, 0.4);
}

.magic-btn:active {
    transform: translateY(0);
}

.icon-btn.btn-ai-split {
    color: #8b5cf6;
}

.icon-btn.btn-ai-split:hover {
    background-color: rgba(139, 92, 246, 0.1);
    transform: scale(1.1);
}

.icon-btn.btn-delete {
    color: #ef4444;
}

/* Loading spinner for AI */
.magic-btn.loading {
    cursor: wait;
    opacity: 0.8;
}

.magic-btn.loading i {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from {
        transform: rotate(0deg);
    }

    to {
        transform: rotate(360deg);
    }
}

/* Input Section */
.input-group {
    display: flex;
    gap: 1rem;
}

.input-wrapper {
    flex: 1;
    position: relative;
    display: flex;
    align-items: center;
}

.input-icon {
    position: absolute;
    left: 1rem;
    color: var(--text-secondary);
}

input[type="text"] {
    width: 100%;
    padding: 1rem 1rem 1rem 3rem;
    background: rgba(15, 23, 42, 0.5);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 1rem;
    outline: none;
    transition: var(--transition);
}

.secondary-btn {
    background: transparent;
    border: 1px solid var(--glass-border);
    color: var(--text-secondary);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.secondary-btn.danger-btn-text:hover {
    color: var(--danger-color);
    border-color: var(--danger-color);
    background: rgba(239, 68, 68, 0.1);
}

input[type="text"]:focus {
    border-color: var(--accent-color);
    background: rgba(15, 23, 42, 0.8);
}

button#add-btn {
    padding: 0 1.5rem;
    background: var(--accent-color);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
}

button#add-btn:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
}

/* Task List */
.task-list-container {
    min-height: 300px;
}

ul.task-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

/* Root list specific */
ul.root-list {
    gap: 0.8rem;
}

/* Sub-lists */
ul.sub-list {
    margin-top: 0.5rem;
    margin-left: 20px;
    /* Indentation */
    padding-left: 10px;
    border-left: 2px solid rgba(255, 255, 255, 0.1);
    /* Default guide line */
}

/* Dynamic Indent Colors - Using nth-child selectors logic in JS or CSS classes */
ul.sub-list.level-1 {
    border-left-color: var(--level-1);
}

ul.sub-list.level-2 {
    border-left-color: var(--level-2);
}

ul.sub-list.level-3 {
    border-left-color: var(--level-3);
}

ul.sub-list.level-4 {
    border-left-color: var(--level-4);
}

/* Task Item Wrapper */
.task-item-container {
    display: flex;
    flex-direction: column;
}

.task-card {
    background: rgba(30, 41, 59, 0.4);
    padding: 0.8rem 1rem;
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.03);
    display: flex;
    align-items: center;
    gap: 0.8rem;
    transition: var(--transition);
    position: relative;
    user-select: none;
}

.task-card:hover {
    background: rgba(30, 41, 59, 0.8);
    border-color: rgba(255, 255, 255, 0.1);
}

/* Drag Handle */
.drag-handle {
    cursor: grab;
    color: var(--text-secondary);
    opacity: 0.4;
    padding: 0.2rem;
}

.drag-handle:hover {
    opacity: 1;
    color: var(--text-primary);
}

/* Checkbox */
.custom-checkbox {
    appearance: none;
    width: 20px;
    height: 20px;
    border: 2px solid var(--text-secondary);
    border-radius: 6px;
    cursor: pointer;
    display: grid;
    place-content: center;
    transition: var(--transition);
    flex-shrink: 0;
}

.custom-checkbox:checked {
    background: var(--success-color);
    border-color: var(--success-color);
}

.custom-checkbox:checked::after {
    content: '\f00c';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    color: white;
    font-size: 12px;
}

/* Task Content */
.task-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
    overflow: hidden;
}

.task-row-main {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.task-text {
    font-size: 1rem;
    color: var(--text-primary);
    cursor: text;
    border-bottom: 1px dashed transparent;
    transition: var(--transition);
}

.task-text:hover {
    border-bottom-color: var(--text-secondary);
}

.task-text:focus {
    outline: none;
    border-bottom: 1px solid var(--accent-color);
    background: rgba(0, 0, 0, 0.2);
}

.task-completed .task-text {
    text-decoration: line-through;
    color: var(--text-secondary);
    opacity: 0.7;
}

/* Badges */
.badge {
    font-size: 0.7rem;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-weight: 600;
    text-transform: uppercase;
    cursor: pointer;
    user-select: none;
}

.badge-priority {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-secondary);
    border: 1px solid transparent;
}

.badge-priority[data-value="High"] {
    color: var(--priority-high);
    border-color: var(--priority-high);
    background: rgba(244, 63, 94, 0.1);
}

.badge-priority[data-value="Middle"] {
    color: var(--priority-mid);
    border-color: var(--priority-mid);
    background: rgba(245, 158, 11, 0.1);
}

.badge-priority[data-value="Low"] {
    color: var(--priority-low);
    border-color: var(--priority-low);
    background: rgba(16, 185, 129, 0.1);
}

.badge-time {
    background: rgba(59, 130, 246, 0.1);
    color: var(--info-color);
    cursor: text;
}

/* Metadata (Date/Stats) */
.task-meta {
    font-size: 0.75rem;
    color: var(--text-secondary);
    display: flex;
    gap: 1rem;
    opacity: 0.7;
}

/* Action Buttons */
.task-actions {
    display: flex;
    gap: 0.2rem;
    opacity: 0;
    /* Hidden by default */
    transition: var(--transition);
}

.task-card:hover .task-actions {
    opacity: 1;
}

.icon-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    width: 28px;
    height: 28px;
    border-radius: 4px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.icon-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.btn-delete:hover {
    color: var(--danger-color);
    background: rgba(239, 68, 68, 0.1);
}

/* Hidden elements */
.hidden {
    display: none !important;
}

/* Responsive */
@media (max-width: 600px) {
    .app-container {
        padding: 1rem;
        width: 100%;
        border: none;
        border-radius: 0;
    }

    .task-actions {
        opacity: 1;
        /* Always show on mobile */
    }

    ul.sub-list {
        margin-left: 10px;
        padding-left: 8px;
    }

    .task-meta {
        flex-direction: column;
        gap: 0.2rem;
    }

    /* Stack input and buttons on mobile */
    .input-group {
        flex-wrap: wrap;
    }

    .input-wrapper {
        min-width: 100%;
        /* Force full width */
    }

    /* Make buttons share the next row equally */
    #add-btn,
    #ai-split-btn {
        flex: 1;
        justify-content: center;
        min-height: 42px;
        /* Ensure consistent height */
    }
}

/* Drag & Drop Visual Feedback */
.task-card.drag-over {
    /* Legacy fallback */
    border: 1px dashed var(--accent-color);
}

/* Insert Before (Top) */
.task-card.drag-over-top {
    border-top: 2px solid var(--accent-color) !important;
    background: rgba(30, 41, 59, 0.4);
}

/* Insert After (Bottom) */
.task-card.drag-over-bottom {
    border-bottom: 2px solid var(--accent-color) !important;
    background: rgba(30, 41, 59, 0.4);
}

/* Nesting (Inside) */
.task-card.drag-over-inside {
    background: rgba(139, 92, 246, 0.2) !important;
    border: 2px dashed var(--accent-color) !important;
}