/* CSS variables for a premium, unified design system */
:root {
    --bg-gradient-start: #080710;
    --bg-gradient-end: #0f1123;
    
    /* Glassmorphic colors */
    --glass-bg: rgba(255, 255, 255, 0.02);
    --glass-border: rgba(255, 255, 255, 0.06);
    --glass-highlight: rgba(255, 255, 255, 0.09);
    --glass-shadow: rgba(0, 0, 0, 0.4);
    
    /* Accent & State Colors */
    --accent-primary: #8b5cf6; /* Violet */
    --accent-primary-glow: rgba(139, 92, 246, 0.3);
    
    --color-low: #06b6d4; /* Cyan */
    --color-low-glow: rgba(6, 182, 212, 0.25);
    
    --color-medium: #f59e0b; /* Amber */
    --color-medium-glow: rgba(245, 158, 11, 0.25);
    
    --color-high: #f43f5e; /* Rose */
    --color-high-glow: rgba(244, 63, 94, 0.25);
    
    --color-success: #10b981; /* Emerald */
    --color-success-glow: rgba(16, 185, 129, 0.25);
    
    /* Neutral text */
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    /* Typography */
    --font-heading: 'Outfit', 'Inter', sans-serif;
    --font-body: 'Inter', sans-serif;
    
    /* Transitions */
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.15s ease;
}

/* Base resets & layout */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background: radial-gradient(circle at 50% 50%, var(--bg-gradient-end), var(--bg-gradient-start));
    color: var(--text-primary);
    font-family: var(--font-body);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
    line-height: 1.5;
}

/* Background blob decorations for glowing glassmorphism effect */
.background-decor {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: -1;
    overflow: hidden;
    pointer-events: none;
}

.blob {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.15;
    animation: blob-float 20s infinite alternate ease-in-out;
}

.blob-1 {
    top: -10%;
    left: 10%;
    width: 450px;
    height: 450px;
    background: var(--accent-primary);
}

.blob-2 {
    bottom: 10%;
    right: 5%;
    width: 500px;
    height: 500px;
    background: var(--color-low);
    animation-delay: -5s;
}

.blob-3 {
    top: 40%;
    left: 45%;
    width: 350px;
    height: 350px;
    background: var(--color-high);
    animation-delay: -10s;
}

@keyframes blob-float {
    0% {
        transform: translate(0, 0) scale(1);
    }
    100% {
        transform: translate(80px, 50px) scale(1.2);
    }
}

/* Main Container */
.app-container {
    max-width: 1250px;
    margin: 0 auto;
    padding: 2.5rem 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* Glass panel style modifier */
.glass {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
    border-radius: 20px;
    box-shadow: 0 8px 32px 0 var(--glass-shadow);
}

/* App Header */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 0.5rem;
}

.brand {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo-icon {
    width: 48px;
    height: 48px;
    border-radius: 14px;
    background: linear-gradient(135deg, var(--accent-primary), var(--color-low));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    box-shadow: 0 4px 15px rgba(139, 92, 246, 0.4);
}

.logo-icon i {
    width: 24px;
    height: 24px;
}

.brand-text h1 {
    font-family: var(--font-heading);
    font-size: 1.6rem;
    font-weight: 800;
    letter-spacing: 2px;
    background: linear-gradient(135deg, #ffffff, #a78bfa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1.1;
}

.brand-text span {
    font-size: 0.75rem;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--text-secondary);
}

.datetime {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    padding: 0.6rem 1.2rem;
    border-radius: 30px;
    backdrop-filter: blur(8px);
}

/* Stats Overview */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.25rem;
}

.stat-card {
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1.25rem;
    position: relative;
    overflow: hidden;
    transition: var(--transition-smooth);
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, rgba(255,255,255,0.01) 0%, rgba(255,255,255,0.04) 100%);
    pointer-events: none;
}

.stat-card:hover {
    transform: translateY(-4px);
    border-color: var(--glass-highlight);
}

.stat-icon {
    width: 52px;
    height: 52px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.icon-blue {
    background: rgba(59, 130, 246, 0.15);
    color: #60a5fa;
    border: 1px solid rgba(59, 130, 246, 0.2);
}

.icon-amber {
    background: rgba(245, 158, 11, 0.15);
    color: #fbbf24;
    border: 1px solid rgba(245, 158, 11, 0.2);
}

.icon-green {
    background: rgba(16, 185, 129, 0.15);
    color: #34d399;
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.stat-info {
    display: flex;
    flex-direction: column;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.stat-value {
    font-family: var(--font-heading);
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
}

/* Progress Stat Card Specifics */
.progress-card {
    justify-content: flex-start;
}

.progress-ring-container {
    position: relative;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.progress-ring {
    transform: rotate(-90deg);
}

.progress-ring__circle {
    transition: stroke-dashoffset 0.35s;
    transform-origin: 50% 50%;
    stroke-dasharray: 150.79; /* 2 * pi * r (r=24) = 150.796 */
    stroke-dashoffset: 150.79;
}

.progress-text {
    position: absolute;
    font-size: 0.8rem;
    font-family: var(--font-heading);
    font-weight: 700;
    color: var(--color-low);
}

/* Main Layout Grid */
.main-layout {
    display: grid;
    grid-template-columns: 380px 1fr;
    gap: 2rem;
    align-items: start;
}

.panel-title {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

/* Form Panel Styling */
.task-form-panel {
    padding: 1.75rem;
}

.todo-form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-row {
    display: flex;
    gap: 1rem;
}

.half-width {
    width: 50%;
}

.form-group label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.form-group input[type="text"],
.form-group textarea,
.form-group input[type="date"],
.category-select,
.custom-select-wrapper select {
    width: 100%;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 0.75rem 1rem;
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.9rem;
    outline: none;
    transition: var(--transition-smooth);
}

.form-group input[type="text"]::placeholder,
.form-group textarea::placeholder {
    color: var(--text-muted);
}

.form-group input[type="text"]:focus,
.form-group textarea:focus,
.form-group input[type="date"]:focus,
.custom-select-wrapper select:focus,
.category-select:focus {
    border-color: var(--accent-primary);
    background: rgba(255, 255, 255, 0.05);
    box-shadow: 0 0 0 3px var(--accent-primary-glow);
}

/* Custom Dropdowns */
.custom-select-wrapper {
    position: relative;
    width: 100%;
}

.custom-select-wrapper select {
    appearance: none;
    -webkit-appearance: none;
    cursor: pointer;
    padding-right: 2rem;
}

.custom-select-wrapper::after {
    content: '▾';
    font-size: 0.8rem;
    color: var(--text-secondary);
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    pointer-events: none;
}

/* Priority radio pill selector */
.priority-selector {
    display: flex;
    gap: 0.75rem;
}

.priority-btn {
    flex: 1;
    position: relative;
    cursor: pointer;
    text-align: center;
}

.priority-btn input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    height: 0;
    width: 0;
}

.priority-btn span {
    display: block;
    padding: 0.75rem 0.5rem;
    border-radius: 10px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--glass-border);
    transition: var(--transition-smooth);
}

/* State changes for priority buttons */
.priority-btn.low input:checked + span {
    background: rgba(6, 182, 212, 0.1);
    color: var(--color-low);
    border-color: var(--color-low);
    box-shadow: 0 0 10px var(--color-low-glow);
}

.priority-btn.medium input:checked + span {
    background: rgba(245, 158, 11, 0.1);
    color: var(--color-medium);
    border-color: var(--color-medium);
    box-shadow: 0 0 10px var(--color-medium-glow);
}

.priority-btn.high input:checked + span {
    background: rgba(244, 63, 94, 0.1);
    color: var(--color-high);
    border-color: var(--color-high);
    box-shadow: 0 0 10px var(--color-high-glow);
}

.priority-btn:hover span {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--glass-highlight);
    color: var(--text-primary);
}

/* Submit Button */
.submit-btn {
    background: linear-gradient(135deg, var(--accent-primary), #6d28d9);
    border: none;
    border-radius: 12px;
    padding: 0.85rem;
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.95rem;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    box-shadow: 0 4px 15px rgba(139, 92, 246, 0.3);
    transition: var(--transition-smooth);
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(139, 92, 246, 0.5);
    background: linear-gradient(135deg, #9f75ff, #7c3aed);
}

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

.submit-btn i {
    width: 18px;
    height: 18px;
}

/* Right Panel / Todo List View */
.tasks-list-panel {
    padding: 1.75rem;
    min-height: 520px;
    display: flex;
    flex-direction: column;
}

/* List Toolbar */
.list-toolbar {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    margin-bottom: 1.5rem;
    padding-bottom: 1.25rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.search-box {
    position: relative;
    width: 100%;
}

.search-icon {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    width: 18px;
    height: 18px;
    color: var(--text-muted);
    pointer-events: none;
}

.search-box input {
    width: 100%;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 0.8rem 1rem 0.8rem 2.75rem;
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.95rem;
    outline: none;
    transition: var(--transition-smooth);
}

.search-box input:focus {
    border-color: var(--accent-primary);
    background: rgba(255, 255, 255, 0.04);
}

.clear-search-btn {
    position: absolute;
    right: 14px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

.clear-search-btn:hover {
    color: var(--text-primary);
}

.clear-search-btn i {
    width: 16px;
    height: 16px;
}

/* Filter controls row */
.filter-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.filter-group {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--glass-border);
    padding: 0.3rem;
    border-radius: 10px;
    display: flex;
    gap: 0.25rem;
}

.filter-btn {
    background: none;
    border: none;
    padding: 0.45rem 1rem;
    border-radius: 8px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition-smooth);
}

.filter-btn.active {
    background: rgba(255, 255, 255, 0.06);
    color: var(--text-primary);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.filter-btn:hover:not(.active) {
    color: var(--text-primary);
    background: rgba(255,255,255,0.02);
}

.category-filter-wrapper {
    min-width: 160px;
}

.category-filter-wrapper .category-select {
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
    border-radius: 10px;
}

/* Todo List Containers */
.todos-container {
    display: flex;
    flex-direction: column;
    gap: 0.9rem;
    overflow-y: auto;
    max-height: 550px;
    padding-right: 0.25rem;
}

/* Custom Scrollbar for container */
.todos-container::-webkit-scrollbar {
    width: 6px;
}

.todos-container::-webkit-scrollbar-track {
    background: transparent;
}

.todos-container::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 10px;
}

.todos-container::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.1);
}

/* Individual Todo Item Card */
.todo-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1.15rem;
    background: rgba(255, 255, 255, 0.015);
    border: 1px solid rgba(255, 255, 255, 0.03);
    border-radius: 16px;
    transition: var(--transition-smooth);
    animation: fade-slide-in 0.35s ease forwards;
}

.todo-item:hover {
    transform: translateY(-2px);
    background: rgba(255, 255, 255, 0.03);
    border-color: var(--glass-border);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

@keyframes fade-slide-in {
    from {
        opacity: 0;
        transform: translateY(12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Custom Checkbox Design */
.checkbox-container {
    position: relative;
    width: 22px;
    height: 22px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: 2px;
    flex-shrink: 0;
}

.checkbox-container input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    height: 0;
    width: 0;
}

.checkmark {
    position: absolute;
    top: 0;
    left: 0;
    height: 22px;
    width: 22px;
    background-color: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--glass-border);
    border-radius: 6px;
    transition: var(--transition-smooth);
    display: flex;
    align-items: center;
    justify-content: center;
}

.checkmark i {
    width: 14px;
    height: 14px;
    color: white;
    opacity: 0;
    transform: scale(0.6);
    transition: var(--transition-smooth);
}

.checkbox-container:hover input ~ .checkmark {
    border-color: var(--accent-primary);
    background-color: rgba(139, 92, 246, 0.05);
}

.checkbox-container input:checked ~ .checkmark {
    background-color: var(--accent-primary);
    border-color: var(--accent-primary);
    box-shadow: 0 0 8px var(--accent-primary-glow);
}

.checkbox-container input:checked ~ .checkmark i {
    opacity: 1;
    transform: scale(1);
}

/* Content Inside Todo Item */
.todo-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.todo-title-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.todo-title {
    font-size: 0.98rem;
    font-weight: 500;
    color: var(--text-primary);
    transition: var(--transition-smooth);
}

.todo-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
    word-break: break-word;
    display: block;
}

/* Tags & Indicators */
.todo-meta {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-top: 0.2rem;
    flex-wrap: wrap;
}

.meta-tag {
    font-size: 0.7rem;
    font-weight: 600;
    padding: 0.2rem 0.6rem;
    border-radius: 20px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.meta-tag i {
    width: 10px;
    height: 10px;
}

/* Priority tags styling */
.priority-tag.low {
    background: rgba(6, 182, 212, 0.1);
    color: var(--color-low);
    border: 1px solid rgba(6, 182, 212, 0.15);
}

.priority-tag.medium {
    background: rgba(245, 158, 11, 0.1);
    color: var(--color-medium);
    border: 1px solid rgba(245, 158, 11, 0.15);
}

.priority-tag.high {
    background: rgba(244, 63, 94, 0.1);
    color: var(--color-high);
    border: 1px solid rgba(244, 63, 94, 0.15);
}

/* Category tags styling */
.category-tag {
    background: rgba(255, 255, 255, 0.03);
    color: var(--text-secondary);
    border: 1px solid var(--glass-border);
}

/* Due date tag styling */
.due-tag {
    background: rgba(255, 255, 255, 0.02);
    color: var(--text-secondary);
    border: 1px solid var(--glass-border);
}

.due-tag.overdue {
    background: rgba(244, 63, 94, 0.08);
    color: var(--color-high);
    border-color: rgba(244, 63, 94, 0.15);
}

.due-tag.today {
    background: rgba(245, 158, 11, 0.08);
    color: var(--color-medium);
    border-color: rgba(245, 158, 11, 0.15);
}

/* Actions */
.todo-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    align-self: center;
}

.action-btn {
    background: none;
    border: none;
    width: 32px;
    height: 32px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    cursor: pointer;
    transition: var(--transition-smooth);
}

.action-btn:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
}

.action-btn.delete-btn:hover {
    color: var(--color-high);
    background: rgba(244, 63, 94, 0.1);
}

.action-btn i {
    width: 16px;
    height: 16px;
}

/* Completed Todo Item Modifier styling */
.todo-item.completed {
    opacity: 0.5;
    border-color: rgba(255, 255, 255, 0.01);
    background: rgba(255, 255, 255, 0.005);
}

.todo-item.completed .todo-title {
    text-decoration: line-through;
    color: var(--text-muted);
}

.todo-item.completed .todo-desc {
    color: var(--text-muted);
}

/* Empty State */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 4rem 2rem;
    flex: 1;
}

.empty-icon {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--glass-border);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    margin-bottom: 1.25rem;
}

.empty-icon i {
    width: 30px;
    height: 30px;
}

.empty-state h4 {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.empty-state p {
    font-size: 0.85rem;
    color: var(--text-muted);
    max-width: 250px;
}

/* Slide out keyframes for deletions */
@keyframes slide-out-left {
    from {
        opacity: 1;
        transform: translateX(0);
    }
    to {
        opacity: 0;
        transform: translateX(-30px);
    }
}

.todo-item.deleting {
    animation: slide-out-left 0.3s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

/* Toast System */
.toast-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.toast {
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 12px;
    padding: 0.85rem 1.25rem;
    color: var(--text-primary);
    box-shadow: 0 10px 25px rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    min-width: 280px;
    animation: toast-in 0.35s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
    transition: var(--transition-smooth);
}

.toast.toast-success {
    border-left: 3px solid var(--color-success);
}

.toast.toast-error {
    border-left: 3px solid var(--color-high);
}

.toast.toast-info {
    border-left: 3px solid var(--color-low);
}

.toast i {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

.toast.toast-success i { color: var(--color-success); }
.toast.toast-error i { color: var(--color-high); }
.toast.toast-info i { color: var(--color-low); }

.toast-msg {
    font-size: 0.85rem;
    font-weight: 500;
}

@keyframes toast-in {
    from {
        opacity: 0;
        transform: translateY(20px) scale(0.9);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.toast.toast-out {
    opacity: 0;
    transform: translateY(-20px) scale(0.9);
}

/* Responsiveness - tablet & phone viewports */
@media (max-width: 1024px) {
    .main-layout {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .app-container {
        padding: 1.5rem 1rem;
        gap: 1.5rem;
    }
    
    .app-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
    
    .datetime {
        align-self: flex-start;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .list-toolbar {
        flex-direction: column;
        align-items: stretch;
    }
    
    .filter-controls {
        flex-direction: column;
        align-items: stretch;
    }
    
    .filter-group {
        justify-content: space-between;
    }
    
    .filter-btn {
        flex: 1;
        text-align: center;
    }
    
    .category-filter-wrapper {
        width: 100%;
    }
    
    .form-row {
        flex-direction: column;
        gap: 1.25rem;
    }
    
    .half-width {
        width: 100%;
    }
}