/* Premium Glassmorphism Theme Design System */

:root {
    /* Dark Theme (Default) */
    --bg-primary: #090d16;
    --bg-secondary: #0f172a;
    --bg-sidebar: rgba(15, 23, 42, 0.75);
    --bg-card: rgba(30, 41, 59, 0.45);
    --bg-glass-modal: rgba(15, 23, 42, 0.85);
    --bg-input: rgba(15, 23, 42, 0.6);
    
    --border-color: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(139, 92, 246, 0.35);
    --border-focus: rgba(139, 92, 246, 0.6);
    
    --accent-color: #8b5cf6;
    --accent-glow: rgba(139, 92, 246, 0.25);
    --accent-hover: #a78bfa;
    --accent-gradient: linear-gradient(135deg, #8b5cf6 0%, #d946ef 100%);
    --accent-gradient-hover: linear-gradient(135deg, #a78bfa 0%, #e879f9 100%);
    
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    --color-completed: #10b981;
    --color-completed-bg: rgba(16, 185, 129, 0.1);
    --color-completed-border: rgba(16, 185, 129, 0.3);
    
    --color-priority-low: #38bdf8;
    --color-priority-medium: #fbbf24;
    --color-priority-high: #f43f5e;
    
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    
    --shadow-sm: 0 2px 8px -1px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 8px 24px -4px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 16px 40px -8px rgba(0, 0, 0, 0.6);
    
    --glass-blur: blur(12px);
}

/* Light Theme Variables */
[data-theme="light"] {
    --bg-primary: #f1f5f9;
    --bg-secondary: #ffffff;
    --bg-sidebar: rgba(226, 232, 240, 0.8);
    --bg-card: rgba(255, 255, 255, 0.65);
    --bg-glass-modal: rgba(255, 255, 255, 0.92);
    --bg-input: rgba(241, 245, 249, 0.8);
    
    --border-color: rgba(15, 23, 42, 0.08);
    --border-hover: rgba(139, 92, 246, 0.28);
    --border-focus: rgba(139, 92, 246, 0.55);
    
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    
    --accent-glow: rgba(139, 92, 246, 0.15);
    
    --shadow-sm: 0 2px 8px -1px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 8px 24px -4px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 16px 40px -8px rgba(0, 0, 0, 0.15);
}

* {
    box-sizing: border-box;
}

html, body {
    height: 100%;
    margin: 0;
    padding: 0;
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    overflow: hidden;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
}
[data-theme="light"] ::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.1);
}
::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.2);
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Outfit', sans-serif;
    font-weight: 600;
    color: var(--text-primary);
}

/* Custom App Layout Structure */
.app-container {
    display: flex;
    height: 100vh;
    width: 100vw;
    background-image: 
        radial-gradient(at 0% 0%, rgba(139, 92, 246, 0.12) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(217, 70, 239, 0.08) 0px, transparent 50%);
    background-attachment: fixed;
    overflow: hidden;
}

[data-theme="light"] .app-container {
    background-image: 
        radial-gradient(at 0% 0%, rgba(139, 92, 246, 0.05) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(217, 70, 239, 0.03) 0px, transparent 50%);
}

/* Main Content Panel */
.main-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
    height: 100%;
    overflow: hidden;
    position: relative;
    z-index: 10;
}

/* Glassmorphism Sidebar */
.sidebar-panel {
    width: 300px;
    background: var(--bg-sidebar);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    height: 100%;
    z-index: 20;
    transition: var(--transition-normal);
}

/* Header Area in Sidebar */
.sidebar-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.sidebar-header h2 {
    font-size: 1.35rem;
    margin: 0;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.5px;
}

/* Sidebar List Item */
.list-item-container {
    padding: 0.5rem 1rem;
}

.list-item-btn {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    border-radius: 12px;
    border: 1px solid transparent;
    background: transparent;
    color: var(--text-secondary);
    text-align: left;
    transition: var(--transition-fast);
    cursor: pointer;
    text-decoration: none;
}

.list-item-btn:hover {
    background: rgba(255, 255, 255, 0.03);
    color: var(--text-primary);
    border-color: var(--border-color);
}
[data-theme="light"] .list-item-btn:hover {
    background: rgba(0, 0, 0, 0.02);
}

.list-item-btn.active {
    background: rgba(139, 92, 246, 0.12);
    color: var(--text-primary);
    border-color: rgba(139, 92, 246, 0.25);
    box-shadow: 0 0 15px -3px rgba(139, 92, 246, 0.15);
}

.list-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 500;
    font-size: 0.95rem;
    overflow: hidden;
}

.list-info span {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.list-stats {
    font-size: 0.75rem;
    padding: 2px 8px;
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.06);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}
[data-theme="light"] .list-stats {
    background: rgba(0, 0, 0, 0.05);
}

.list-item-btn.active .list-stats {
    background: rgba(139, 92, 246, 0.2);
    color: var(--accent-hover);
    border-color: rgba(139, 92, 246, 0.3);
}

/* Sidebar Footer / Creation Area */
.sidebar-footer {
    margin-top: auto;
    padding: 1.25rem;
    border-top: 1px solid var(--border-color);
}

/* Inputs & Form Fields Glass style */
.glass-input-group {
    display: flex;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2px;
    transition: var(--transition-fast);
}

.glass-input-group:focus-within {
    border-color: var(--border-focus);
    box-shadow: 0 0 12px var(--accent-glow);
}

.glass-input {
    flex: 1;
    background: transparent;
    border: none;
    padding: 0.6rem 0.8rem;
    color: var(--text-primary);
    font-size: 0.9rem;
    outline: none;
}

.glass-input::placeholder {
    color: var(--text-muted);
}

.glass-btn-icon {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 0.5rem 0.75rem;
    border-radius: 10px;
    transition: var(--transition-fast);
    cursor: pointer;
}

.glass-btn-icon:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
}
[data-theme="light"] .glass-btn-icon:hover {
    background: rgba(0, 0, 0, 0.03);
}

.glass-btn-primary {
    background: var(--accent-gradient);
    border: none;
    color: white;
    padding: 0.6rem 1.2rem;
    border-radius: 10px;
    font-weight: 500;
    font-size: 0.9rem;
    transition: var(--transition-fast);
    cursor: pointer;
}

.glass-btn-primary:hover {
    background: var(--accent-gradient-hover);
    box-shadow: 0 0 15px rgba(139, 92, 246, 0.4);
}

/* Main Dashboard Header */
.main-header {
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--border-color);
    background: rgba(9, 13, 22, 0.4);
    backdrop-filter: var(--glass-blur);
    display: flex;
    align-items: center;
    justify-content: space-between;
}
[data-theme="light"] .main-header {
    background: rgba(255, 255, 255, 0.4);
}

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

.list-title {
    font-size: 1.75rem;
    margin: 0;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.header-progress-container {
    margin-top: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    width: 250px;
}

.header-progress-bar {
    flex: 1;
    height: 6px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 3px;
    overflow: hidden;
    border: 1px solid var(--border-color);
}
[data-theme="light"] .header-progress-bar {
    background: rgba(0, 0, 0, 0.05);
}

.header-progress-fill {
    height: 100%;
    background: var(--accent-gradient);
    border-radius: 3px;
    transition: width var(--transition-slow);
}

.header-progress-text {
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-weight: 600;
}

/* Main Interactive Content Area */
.dashboard-content {
    flex: 1;
    padding: 2rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* Floating Task Input Bar */
.add-task-bar {
    max-width: 800px;
    width: 100%;
    margin: 0 auto;
    background: var(--bg-card);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 0.5rem;
    display: flex;
    align-items: center;
    box-shadow: var(--shadow-md);
    transition: var(--transition-normal);
}

.add-task-bar:focus-within {
    border-color: var(--border-focus);
    box-shadow: 0 0 20px -3px rgba(139, 92, 246, 0.25);
    transform: translateY(-1px);
}

.add-task-input {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    padding: 0.75rem 1rem;
    color: var(--text-primary);
    font-size: 1.05rem;
}

.add-task-input::placeholder {
    color: var(--text-muted);
}

/* Filter bar */
.filter-bar {
    max-width: 800px;
    width: 100%;
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    align-items: center;
    justify-content: flex-start;
}

.filter-pill {
    padding: 0.4rem 0.9rem;
    border-radius: 20px;
    border: 1px solid var(--border-color);
    background: rgba(255, 255, 255, 0.02);
    color: var(--text-secondary);
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
}
[data-theme="light"] .filter-pill {
    background: rgba(0, 0, 0, 0.02);
}

.filter-pill:hover, .filter-pill.active {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-primary);
    border-color: var(--text-secondary);
}
[data-theme="light"] .filter-pill:hover, [data-theme="light"] .filter-pill.active {
    background: rgba(0, 0, 0, 0.04);
}

.filter-pill.active-accent {
    background: rgba(139, 92, 246, 0.15);
    border-color: rgba(139, 92, 246, 0.4);
    color: var(--accent-hover);
}
[data-theme="light"] .filter-pill.active-accent {
    background: rgba(139, 92, 246, 0.08);
}

.search-mini {
    position: relative;
    max-width: 200px;
    margin-right: auto;
}

.search-mini-input {
    width: 100%;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 0.35rem 2.2rem 0.35rem 2.2rem;
    color: var(--text-primary);
    font-size: 0.8rem;
    outline: none;
    transition: var(--transition-fast);
}
[data-theme="light"] .search-mini-input {
    background: rgba(0, 0, 0, 0.02);
}

.search-mini-input:focus {
    border-color: var(--border-focus);
    background: rgba(255, 255, 255, 0.05);
}

.search-mini i {
    position: absolute;
    left: 0.8rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: 0.85rem;
}

.search-clear-btn {
    position: absolute;
    right: 0.8rem;
    top: 50%;
    transform: translateY(-50%);
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color var(--transition-fast);
}

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

/* Premium Filter Selector elements styling with high contrast */
.filter-select {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: 20px;
    padding: 0.35rem 0.75rem;
    font-size: 0.8rem;
    font-weight: 500;
    outline: none;
    cursor: pointer;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    max-height: 32px;
}

.filter-select:hover {
    border-color: var(--border-hover);
}

.filter-select:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 8px var(--accent-glow);
}

/* Tasks Container */
.tasks-container {
    max-width: 800px;
    width: 100%;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

/* Task Item Card */
.task-item-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 14px;
    padding: 0.9rem 1.2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    cursor: pointer;
    transition: var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.task-item-card:hover {
    border-color: var(--border-hover);
    transform: translateX(2px);
    background: rgba(30, 41, 59, 0.55);
}
[data-theme="light"] .task-item-card:hover {
    background: rgba(255, 255, 255, 0.85);
}

.task-item-card.active-selected {
    border-color: var(--border-focus);
    box-shadow: 0 0 15px -3px rgba(139, 92, 246, 0.2);
    background: rgba(139, 92, 246, 0.05);
}

/* Simplified Task Card layout */
.task-item-card.simple-card {
    padding: 0.58rem 1.2rem;
}

.task-left {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex: 1;
    overflow: hidden;
}

/* Checkbox Hitbox for easier click targets */
.checkbox-hitbox {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    margin-left: -0.65rem;
    cursor: pointer;
    border-radius: 8px;
    transition: var(--transition-fast);
    flex-shrink: 0;
}

.checkbox-hitbox:hover {
    background: rgba(255, 255, 255, 0.05);
}

[data-theme="light"] .checkbox-hitbox:hover {
    background: rgba(0, 0, 0, 0.04);
}

/* Custom Checkbox Styled */
.custom-checkbox {
    width: 22px;
    height: 22px;
    border-radius: 6px;
    border: 2px solid var(--text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition-fast);
    flex-shrink: 0;
    background: transparent;
}

.custom-checkbox:hover {
    border-color: var(--accent-color);
    background: rgba(139, 92, 246, 0.08);
}

.custom-checkbox i {
    font-size: 0.75rem;
    color: transparent;
    transition: var(--transition-fast);
}

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

.custom-checkbox.checked i {
    color: white;
}

.task-info-main {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    flex: 1;
    overflow: hidden;
}

.task-title {
    font-size: 0.98rem;
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    transition: var(--transition-normal);
}

/* Task Meta Badges */
.task-meta-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.5rem;
}

.meta-badge {
    font-size: 0.72rem;
    padding: 2px 8px;
    border-radius: 6px;
    background: rgba(255, 255, 255, 0.04);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}
[data-theme="light"] .meta-badge {
    background: rgba(0, 0, 0, 0.03);
}

.meta-badge.priority-high {
    color: var(--color-priority-high);
    background: rgba(244, 63, 94, 0.08);
    border-color: rgba(244, 63, 94, 0.2);
}

.meta-badge.priority-medium {
    color: var(--color-priority-medium);
    background: rgba(251, 191, 36, 0.08);
    border-color: rgba(251, 191, 36, 0.2);
}

.meta-badge.priority-low {
    color: var(--color-priority-low);
    background: rgba(56, 189, 248, 0.08);
    border-color: rgba(56, 189, 248, 0.2);
}

.meta-badge.due-date {
    color: #a78bfa;
    background: rgba(167, 139, 250, 0.08);
    border-color: rgba(167, 139, 250, 0.2);
}

.meta-badge.due-date.overdue {
    color: #f43f5e;
    background: rgba(244, 63, 94, 0.1);
    border-color: rgba(244, 63, 94, 0.35);
    animation: pulse-border 2s infinite;
}

.meta-badge.category-badge {
    background: rgba(255, 255, 255, 0.06);
    color: var(--text-primary);
    border-color: rgba(255, 255, 255, 0.1);
}
[data-theme="light"] .meta-badge.category-badge {
    background: rgba(0, 0, 0, 0.04);
}

/* Task progress rendering on initial view */
.task-progress-mini {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.task-progress-mini-bar {
    width: 60px;
    height: 4px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 2px;
    overflow: hidden;
}
[data-theme="light"] .task-progress-mini-bar {
    background: rgba(0, 0, 0, 0.05);
}

.task-progress-mini-fill {
    height: 100%;
    background: var(--accent-gradient);
    border-radius: 2px;
}

/* Link Preview Box */
.link-preview-box {
    display: flex;
    background: rgba(0, 0, 0, 0.16);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    margin-top: 0.5rem;
    overflow: hidden;
    max-width: 600px;
    transition: var(--transition-fast);
    text-decoration: none !important;
}

[data-theme="light"] .link-preview-box {
    background: rgba(0, 0, 0, 0.02);
}

.link-preview-box:hover {
    border-color: var(--border-hover);
    background: rgba(0, 0, 0, 0.22);
}

.link-preview-img-container {
    width: 100px;
    height: 70px;
    position: relative;
    flex-shrink: 0;
    background: rgba(255, 255, 255, 0.02);
}

.link-preview-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.link-preview-video-badge {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 26px;
    height: 26px;
    background: rgba(220, 53, 69, 0.9);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 0.8rem;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.4);
}

.link-preview-info {
    padding: 0.5rem 0.75rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
    min-width: 0;
    flex: 1;
}

.link-preview-title {
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 0.15rem;
}

.link-preview-domain {
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 600;
}

/* Completion Animation State */
.task-item-card.completing {
    border-color: var(--color-completed-border) !important;
    background: var(--color-completed-bg) !important;
    box-shadow: 0 0 15px -3px var(--color-completed-border);
}

.task-item-card.completing .task-title {
    text-decoration: line-through;
    text-decoration-color: rgba(148, 163, 184, 0.6);
    color: var(--text-secondary);
}

/* Completed Section Header (Accordion style) */
.completed-section {
    max-width: 800px;
    width: 100%;
    margin: 1.5rem auto 0 auto;
    border-top: 1px solid var(--border-color);
    padding-top: 1.5rem;
}

.completed-toggle {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-secondary);
    font-weight: 600;
    cursor: pointer;
    user-select: none;
    font-size: 1rem;
    transition: var(--transition-fast);
    padding: 0.25rem 0.5rem;
    border-radius: 8px;
    width: max-content;
}

.completed-toggle:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.03);
}

.completed-toggle i {
    transition: var(--transition-fast);
}

.completed-toggle.collapsed i {
    transform: rotate(-90deg);
}

.completed-list {
    margin-top: 0.75rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.completed-list .task-item-card {
    opacity: 0.78;
    background: rgba(15, 23, 42, 0.35);
}

.completed-list .task-title {
    text-decoration: line-through;
    text-decoration-color: rgba(148, 163, 184, 0.6);
    color: var(--text-secondary);
}

/* Light Theme Completed Tasks: Crisp, high-contrast, fully legible titles */
[data-theme="light"] .completed-list .task-item-card {
    opacity: 0.92;
    background: rgba(255, 255, 255, 0.82) !important;
    border-color: rgba(15, 23, 42, 0.12) !important;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

[data-theme="light"] .completed-list .task-title {
    color: #334155 !important; /* Slate 700 - clear, high contrast, highly legible */
    text-decoration: line-through;
    text-decoration-color: #64748b;
    font-weight: 500;
}

[data-theme="light"] .task-item-card.completing .task-title {
    color: #334155 !important;
    text-decoration-color: #64748b;
}

[data-theme="light"] .completed-list .text-muted {
    color: #64748b !important;
}

[data-theme="light"] .completed-toggle {
    color: #334155;
}

[data-theme="light"] .completed-toggle:hover {
    color: #0f172a;
    background: rgba(0, 0, 0, 0.04);
}

/* Right Detail Slider Overlay */
.details-overlay {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(4px);
    z-index: 90;
    animation: fade-in 0.2s ease-out;
}

.details-panel {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: 500px;
    max-width: 90%;
    background: var(--bg-glass-modal);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-left: 1px solid var(--border-color);
    z-index: 100;
    box-shadow: var(--shadow-lg);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    animation: slide-in 0.28s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes slide-in {
    from { transform: translateX(100%); }
    to { transform: translateX(0); }
}

@keyframes fade-in {
    from { opacity: 0; }
    to { opacity: 1; }
}

.details-header {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
}

.details-header-title-container {
    min-width: 0;
    user-select: none;
    -webkit-user-select: none;
    transition: opacity var(--transition-fast);
}

.details-header-title-container:active {
    opacity: 0.8;
}

.details-header-title {
    font-weight: 600;
    line-height: 1.25;
    margin: 0;
    color: var(--text-primary);
    word-break: break-word;
    overflow-wrap: break-word;
    transition: font-size 0.2s ease, color var(--transition-fast);
}

.details-header-title.title-size-xl {
    font-size: 1.5rem;
    font-weight: 700;
}

.details-header-title.title-size-lg {
    font-size: 1.28rem;
    font-weight: 650;
}

.details-header-title.title-size-md {
    font-size: 1.12rem;
    font-weight: 600;
}

.details-header-title.title-size-sm {
    font-size: 0.98rem;
    font-weight: 600;
}

.details-header-title.title-size-expanded {
    font-size: 1.08rem;
    font-weight: 600;
}

.details-header-title-container[style*="cursor: pointer"]:hover .details-header-title {
    color: var(--accent-hover);
}

.title-expand-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 0.72rem;
    color: var(--accent-color);
    background: var(--accent-glow);
    border-radius: 5px;
    padding: 2px 5px;
    vertical-align: middle;
    transition: transform var(--transition-fast);
}

/* Checklist item styles */
.checklist-item-input {
    background: transparent;
    color: var(--text-primary);
    outline: none;
    transition: var(--transition-fast);
}

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

[data-theme="light"] .checklist-item-input.checklist-completed {
    color: #334155;
    opacity: 0.88;
}

.details-content {
    flex: 1;
    padding: 1.5rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* Details fields forms styling */
.detail-field {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.detail-label {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
}

.detail-input, .detail-textarea, .detail-select {
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: 10px;
    padding: 0.65rem 0.9rem;
    font-size: 0.92rem;
    outline: none;
    transition: var(--transition-fast);
}

.detail-input:focus, .detail-textarea:focus, .detail-select:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 12px var(--accent-glow);
}

.detail-textarea {
    resize: vertical;
    min-height: 120px;
    font-family: inherit;
}

/* Markdown preview styles */
.markdown-tabs {
    display: flex;
    border-bottom: 1px solid var(--border-color);
    gap: 1rem;
    margin-bottom: 0.5rem;
}

.markdown-tab {
    padding: 0.4rem 0.2rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
    border-bottom: 2px solid transparent;
    cursor: pointer;
    font-weight: 500;
}

.markdown-tab.active {
    color: var(--accent-hover);
    border-bottom-color: var(--accent-color);
}

.markdown-preview-container {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 1rem;
    min-height: 120px;
    color: var(--text-primary);
    overflow-y: auto;
    font-size: 0.92rem;
    line-height: 1.5;
}

.markdown-preview-container p {
    margin-bottom: 0.75rem;
}

.markdown-preview-container p:last-child {
    margin-bottom: 0;
}

.markdown-preview-container ul, .markdown-preview-container ol {
    padding-left: 1.25rem;
    margin-bottom: 0.75rem;
}

.markdown-preview-container code {
    background: rgba(255, 255, 255, 0.08);
    padding: 2px 4px;
    border-radius: 4px;
    font-family: monospace;
    font-size: 0.85rem;
}

/* Tags editor */
.tags-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.tag-badge-editable {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    background: rgba(139, 92, 246, 0.12);
    color: var(--accent-hover);
    border: 1px solid rgba(139, 92, 246, 0.25);
    padding: 0.25rem 0.65rem;
    border-radius: 8px;
    font-size: 0.8rem;
    font-weight: 500;
}

.tag-badge-editable button {
    background: transparent;
    border: none;
    color: var(--accent-hover);
    padding: 0;
    cursor: pointer;
    font-size: 0.8rem;
    line-height: 1;
}

.tag-badge-editable button:hover {
    color: #ef4444;
}

/* Icon grid selector */
.icon-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 0.35rem;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 0.5rem;
}

.icon-selector-item {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid transparent;
    border-radius: 8px;
    font-size: 1.15rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition-fast);
}

.icon-selector-item:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
}

.icon-selector-item.active {
    background: rgba(139, 92, 246, 0.2);
    color: var(--accent-hover);
    border-color: rgba(139, 92, 246, 0.4);
}

/* Modal styles (ListSettings and Backup) */
.glass-modal-backdrop {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    animation: fade-in 0.2s ease-out;
}

.glass-modal {
    background: var(--bg-glass-modal);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    width: 100%;
    max-width: 480px;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    animation: modal-scale 0.28s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes modal-scale {
    from { transform: scale(0.95); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

.modal-header {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-shrink: 0;
}

.modal-header h3 {
    margin: 0;
    font-size: 1.25rem;
}

.modal-body {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    overflow-y: auto;
    flex: 1;
}

.modal-footer {
    padding: 1.25rem 1.5rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
    flex-shrink: 0;
}

/* Responsive adjustments for modals */
@media (max-width: 768px) {
    .glass-modal-backdrop {
        padding: 0;
    }
    .glass-modal {
        border-radius: 0;
        height: 100%;
        max-height: 100vh;
        width: 100%;
        max-width: 100%;
    }
}

@media (min-width: 769px) {
    .glass-modal {
        max-width: 600px;
    }
}

/* Details Panel Footer background */
.details-footer {
    border-top: 1px solid var(--border-color) !important;
    background: rgba(9, 13, 22, 0.3);
}

[data-theme="light"] .details-footer {
    background: rgba(241, 245, 249, 0.9);
}

.glass-switch-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
}

.glass-switch-label {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
}

.glass-switch-label-title {
    font-size: 0.92rem;
    font-weight: 500;
    color: var(--text-primary);
}

.glass-switch-label-desc {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Toggle Switch Visual */
.glass-switch {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 24px;
}

.glass-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.switch-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(255, 255, 255, 0.1);
    transition: .3s;
    border-radius: 24px;
    border: 1px solid var(--border-color);
}

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

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

.glass-switch input:checked + .switch-slider:before {
    transform: translateX(20px);
    background-color: white;
}

/* Notification/Alert custom toast */
.custom-toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(16, 185, 129, 0.9);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 30px;
    box-shadow: var(--shadow-lg);
    z-index: 2000;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    backdrop-filter: blur(10px);
    animation: toast-in-out 3s ease forwards;
}

@keyframes toast-in-out {
    0% { transform: translate(-50%, 1rem); opacity: 0; }
    10% { transform: translate(-50%, 0); opacity: 1; }
    90% { transform: translate(-50%, 0); opacity: 1; }
    100% { transform: translate(-50%, 1rem); opacity: 0; }
}

/* Slider progress styling */
.progress-slider-container {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.progress-slider {
    flex: 1;
    -webkit-appearance: none;
    appearance: none;
    height: 6px;
    border-radius: 3px;
    background: rgba(255, 255, 255, 0.1);
    outline: none;
    border: 1px solid var(--border-color);
}

.progress-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--accent-color);
    cursor: pointer;
    box-shadow: 0 0 10px var(--accent-glow);
    transition: var(--transition-fast);
}

.progress-slider::-webkit-slider-thumb:hover {
    background: var(--accent-hover);
    transform: scale(1.15);
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .sidebar-panel {
        position: fixed;
        left: -300px;
        top: 0;
        bottom: 0;
        z-index: 100;
        transition: left 0.3s cubic-bezier(0.16, 1, 0.3, 1) !important;
        box-shadow: 10px 0 30px rgba(0, 0, 0, 0.25);
    }
    .sidebar-panel.visible {
        left: 0;
    }
    .sidebar-backdrop {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.45);
        backdrop-filter: blur(4px);
        -webkit-backdrop-filter: blur(4px);
        z-index: 99;
        animation: fade-in 0.2s ease-out;
    }
    .details-panel {
        width: 100%;
        max-width: 100%;
    }
    .details-header {
        padding: 0.85rem 1rem;
        gap: 0.5rem;
    }
    .details-header-title.title-size-xl {
        font-size: 1.38rem;
        font-weight: 700;
    }
    .details-header-title.title-size-lg {
        font-size: 1.18rem;
        font-weight: 650;
    }
    .details-header-title.title-size-md {
        font-size: 1.02rem;
        font-weight: 600;
    }
    .details-header-title.title-size-sm {
        font-size: 0.88rem;
        font-weight: 600;
    }
    .details-header-title.title-size-expanded {
        font-size: 0.95rem;
        font-weight: 600;
    }
    .details-delete-btn {
        padding: 0.35rem 0.55rem !important;
    }
    .main-header {
        padding: 1rem;
        flex-direction: column;
        align-items: flex-start;
        gap: 0.75rem;
    }
    .header-left {
        width: 100%;
        display: flex;
        align-items: center;
        justify-content: space-between;
    }
    .header-progress-container {
        width: 100%;
        max-width: 100%;
        margin-top: 0.25rem;
    }
    .dashboard-content {
        padding: 1rem;
        gap: 1rem;
    }
    .add-task-bar {
        border-radius: 12px;
        padding: 0.25rem 0.4rem;
    }
    .add-task-input {
        padding: 0.4rem 0.6rem;
        font-size: 0.95rem;
    }
    .filter-bar {
        padding: 0 0.25rem;
        gap: 0.4rem;
        justify-content: space-between;
    }
    .filter-bar .filter-pill {
        display: none !important;
    }
    .search-mini {
        max-width: 150px;
    }
    .filter-bar select {
        max-width: 150px;
        font-size: 0.78rem !important;
        padding: 0.35rem 0.6rem !important;
    }
    .glass-modal {
        width: 95%;
        max-width: 95%;
        margin: 1rem auto;
    }
}

/* --- PHASE 3 ADDITIONAL STYLES --- */

/* Difficulty Badges */
.meta-badge.difficulty-easy {
    color: #10b981;
    background: rgba(16, 185, 129, 0.08);
    border-color: rgba(16, 185, 129, 0.2);
}

.meta-badge.difficulty-medium {
    color: #a78bfa;
    background: rgba(167, 139, 250, 0.08);
    border-color: rgba(167, 139, 250, 0.2);
}

.meta-badge.difficulty-hard {
    color: #f43f5e;
    background: rgba(244, 63, 94, 0.08);
    border-color: rgba(244, 63, 94, 0.2);
}

/* Drag and Drop Dragging & Over states */
.task-item-card.drag-over {
    border: 2px dashed var(--accent-color) !important;
    background: rgba(139, 92, 246, 0.05) !important;
    transform: scale(0.99);
}

.list-item-btn.drag-over {
    border-color: var(--accent-color) !important;
    background: rgba(139, 92, 246, 0.15) !important;
    box-shadow: 0 0 15px var(--accent-glow) !important;
    transform: scale(1.02);
}

/* Task Contextual Actions Menu (Three dots dropdown) */
.task-menu-container {
    position: relative;
    display: inline-block;
}

.task-menu-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    opacity: 0;
    padding: 0.25rem 0.5rem;
    border-radius: 6px;
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    height: 32px;
    width: 32px;
}

.task-item-card:hover .task-menu-btn, .task-menu-btn.active {
    opacity: 1;
}

.task-menu-btn:hover {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-primary);
}

[data-theme="light"] .task-menu-btn:hover {
    background: rgba(0, 0, 0, 0.04);
}

.task-menu-dropdown {
    position: absolute;
    right: 0;
    top: 100%;
    margin-top: 0.25rem;
    background: var(--bg-glass-modal);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    padding: 0.35rem;
    width: 170px;
    z-index: 1000;
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    animation: fade-in 0.15s ease-out;
}

.task-menu-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 0.45rem 0.75rem;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.85rem;
    text-align: left;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition-fast);
}

.task-menu-item:hover {
    background: rgba(255, 255, 255, 0.06);
    color: var(--text-primary);
}

[data-theme="light"] .task-menu-item:hover {
    background: rgba(0, 0, 0, 0.03);
}

/* Nested Submenu for Mover a... */
.task-menu-item-with-sub {
    position: relative;
}

.task-menu-submenu {
    position: absolute;
    right: 100%;
    top: 0;
    margin-right: 0.25rem;
    background: var(--bg-glass-modal);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    padding: 0.35rem;
    width: 170px;
    display: none;
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    max-height: 250px;
    overflow-y: auto;
}

.task-menu-item-with-sub:hover .task-menu-submenu {
    display: block;
}

/* Copy Link Icon Hover Effect */
.copy-link-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    padding: 0 0.35rem;
    cursor: pointer;
    font-size: 0.88rem;
    transition: var(--transition-fast);
}

.copy-link-btn:hover {
    color: var(--accent-color);
    transform: scale(1.1);
}

/* Phase 5: Reorder handles styling */
.drag-handle-indicator, .list-drag-handle {
    opacity: 0.3;
    transition: opacity var(--transition-fast), color var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.task-item-card:hover .drag-handle-indicator, .list-item-container:hover .list-drag-handle {
    opacity: 0.9;
    color: var(--accent-color) !important;
}

/* Drag over list visual target (during list reordering) */
.list-item-btn.drag-over-list {
    border: 2px dashed var(--accent-color) !important;
    background: rgba(139, 92, 246, 0.05) !important;
}

/* On mobile viewports, show them with medium opacity always so they are discoverable */
@media (max-width: 768px) {
    .drag-handle-indicator, .list-drag-handle {
        opacity: 0.7;
    }
}

/* Custom Tasks Empty Container */
.tasks-empty {
    text-align: center;
    padding: 3rem;
    color: var(--text-muted);
    background: var(--bg-card);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border-color) !important;
    border-radius: 16px;
    margin-top: 0.5rem;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-fast);
}

.tasks-empty:hover {
    border-color: var(--border-hover) !important;
}

/* Mobile Collapsible Filter and Sort Panel */
.mobile-filter-panel {
    background: var(--bg-card);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border-color) !important;
    border-radius: 12px;
    padding: 0.75rem;
    box-shadow: var(--shadow-md);
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.mobile-filter-row {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.mobile-filter-label {
    font-size: 0.72rem;
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 2px;
}

/* Animations */
.animate-fade-in {
    animation: fadeIn var(--transition-fast) ease-out forwards;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-5px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Premium Login Screen CSS */
.login-wrapper {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #090d16;
    z-index: 9999;
    overflow: hidden;
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

[data-theme="light"] .login-wrapper {
    background: #f1f5f9;
}

.login-glow-1 {
    position: absolute;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(139, 92, 246, 0.15) 0%, rgba(0,0,0,0) 70%);
    top: -200px;
    left: -200px;
    pointer-events: none;
    z-index: 1;
}

.login-glow-2 {
    position: absolute;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(217, 70, 239, 0.12) 0%, rgba(0,0,0,0) 70%);
    bottom: -200px;
    right: -200px;
    pointer-events: none;
    z-index: 1;
}

.login-card {
    background: rgba(30, 41, 59, 0.45);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 24px;
    width: 100%;
    max-width: 400px;
    padding: 2.5rem;
    box-shadow: 0 20px 40px -15px rgba(0, 0, 0, 0.5);
    z-index: 10;
    animation: login-card-in 0.6s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

[data-theme="light"] .login-card {
    background: rgba(255, 255, 255, 0.7);
    border-color: rgba(15, 23, 42, 0.08);
    box-shadow: 0 20px 40px -15px rgba(0, 0, 0, 0.08);
}

@keyframes login-card-in {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.login-logo {
    text-align: center;
    margin-bottom: 2rem;
}

.login-logo-icon {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, #8b5cf6 0%, #d946ef 100%);
    border-radius: 18px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.8rem;
    box-shadow: 0 8px 20px rgba(139, 92, 246, 0.3);
    margin-bottom: 1rem;
}

.login-title {
    font-size: 1.8rem;
    font-weight: 700;
    color: #f8fafc;
    margin: 0;
    font-family: 'Outfit', sans-serif;
    letter-spacing: -0.5px;
}

[data-theme="light"] .login-title {
    color: #0f172a;
}

.login-subtitle {
    font-size: 0.88rem;
    color: #94a3b8;
    margin: 0.25rem 0 0 0;
}

[data-theme="light"] .login-subtitle {
    color: #64748b;
}

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

.login-input-group {
    position: relative;
    display: flex;
    align-items: center;
}

.login-input {
    width: 100%;
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 14px;
    padding: 0.85rem 1rem 0.85rem 2.8rem;
    color: #f8fafc;
    font-size: 0.95rem;
    outline: none;
    transition: all 0.2s ease;
}

[data-theme="light"] .login-input {
    background: rgba(241, 245, 249, 0.9);
    border-color: rgba(15, 23, 42, 0.08);
    color: #0f172a;
}

.login-input:focus {
    border-color: #8b5cf6;
    box-shadow: 0 0 12px rgba(139, 92, 246, 0.25);
    background: rgba(15, 23, 42, 0.8);
}

[data-theme="light"] .login-input:focus {
    background: white;
}

.login-input-icon {
    position: absolute;
    left: 1rem;
    color: #64748b;
    font-size: 1.1rem;
}

.login-error {
    background: rgba(244, 63, 94, 0.1);
    border: 1px solid rgba(244, 63, 94, 0.2);
    color: #f43f5e;
    padding: 0.75rem 1rem;
    border-radius: 12px;
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.login-btn {
    background: linear-gradient(135deg, #8b5cf6 0%, #d946ef 100%);
    border: none;
    border-radius: 14px;
    padding: 0.85rem;
    color: white;
    font-weight: 600;
    font-size: 0.98rem;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 8px 20px rgba(139, 92, 246, 0.2);
}

.login-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 12px 24px rgba(139, 92, 246, 0.35);
}

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

.login-btn:disabled {
    opacity: 0.65;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* Custom Category Icon Dropdown Popover */
.category-icon-dropdown-popover {
    position: absolute;
    bottom: 60px; /* position it above the icon button */
    left: 15px;
    background: var(--bg-glass-modal);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 0.75rem;
    box-shadow: var(--shadow-lg);
    z-index: 110;
    width: 310px;
}

.category-icon-dropdown-popover .icon-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 0.5rem;
}

.disabled-btn {
    opacity: 0.4;
    cursor: not-allowed !important;
    pointer-events: none;
}

.detail-select {
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: 10px;
    padding: 0.6rem 0.85rem;
    font-size: 0.95rem;
    outline: none;
    transition: var(--transition-fast);
    cursor: pointer;
}

.detail-select:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

/* Checklist & Subtask Styling */
.custom-checklist-checkbox {
    width: 20px !important;
    height: 20px !important;
    cursor: pointer;
    background-color: var(--bg-input) !important;
    border: 1.5px solid var(--border-color) !important;
    border-radius: 5px !important;
    accent-color: var(--accent-color) !important;
    transition: var(--transition-fast);
}

.custom-checklist-checkbox:checked {
    background-color: var(--accent-color) !important;
    border-color: var(--accent-color) !important;
}

[data-theme="light"] .custom-checklist-checkbox {
    border-color: #94a3b8 !important;
}

.checklist-item-input {
    color: var(--text-primary) !important;
    background: transparent;
    outline: none;
    transition: var(--transition-fast);
}

.checklist-item-input:focus {
    background: var(--bg-input);
    border-radius: 6px;
    padding: 2px 6px;
}

.subtasks-badge {
    font-size: 0.76rem;
    color: var(--accent-hover);
    background: var(--accent-glow);
    padding: 2px 7px;
    border-radius: 6px;
    border: 1px solid rgba(139, 92, 246, 0.25);
    font-weight: 500;
}

[data-theme="light"] .subtasks-badge {
    color: #6d28d9;
    background: rgba(109, 40, 217, 0.1);
    border-color: rgba(109, 40, 217, 0.2);
}

/* --- Temporary Top Task Styling --- */
.temporary-top-task {
    border-color: rgba(99, 102, 241, 0.5) !important;
    box-shadow: 0 0 16px rgba(99, 102, 241, 0.25) !important;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.08), rgba(168, 85, 247, 0.04)) !important;
    transition: border-color 0.4s ease, box-shadow 0.4s ease, background 0.4s ease;
}

[data-theme="light"] .temporary-top-task {
    border-color: rgba(79, 70, 229, 0.4) !important;
    box-shadow: 0 2px 12px rgba(79, 70, 229, 0.15) !important;
    background: linear-gradient(135deg, rgba(79, 70, 229, 0.06), rgba(147, 51, 234, 0.03)) !important;
}

/* --- Refactored Category Combo Dropdown --- */
.category-combo-container {
    width: 100%;
}

.category-combo-selector {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.6rem 0.85rem;
    min-height: 44px;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    cursor: pointer;
    transition: var(--transition-fast);
    user-select: none;
}

.category-combo-selector:hover {
    border-color: var(--border-focus);
    background: rgba(255, 255, 255, 0.04);
}

.category-combo-selector.open {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.category-combo-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 8px;
    background: var(--accent-glow);
    color: var(--accent-color);
    font-size: 1rem;
    flex-shrink: 0;
}

.category-combo-text {
    font-size: 0.95rem;
    color: var(--text-primary);
}

.btn-clear-category {
    background: none;
    border: none;
    padding: 2px 4px;
    color: var(--text-muted);
    font-size: 0.9rem;
    cursor: pointer;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: color 0.15s ease;
}

.btn-clear-category:hover {
    color: #ef4444;
}

.category-dropdown-menu {
    position: absolute;
    top: calc(100% + 6px);
    left: 0;
    right: 0;
    background: var(--bg-glass-modal);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border-color);
    border-radius: 14px;
    box-shadow: var(--shadow-lg);
    z-index: 150;
    max-height: 480px;
    overflow-y: auto;
}

.category-dropdown-list {
    padding: 0.4rem;
}

.category-dropdown-option {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.6rem 0.75rem;
    border-radius: 10px;
    cursor: pointer;
    font-size: 0.92rem;
    color: var(--text-primary);
    transition: background 0.15s ease;
}

.category-dropdown-option:hover {
    background: rgba(255, 255, 255, 0.06);
}

[data-theme="light"] .category-dropdown-option:hover {
    background: rgba(0, 0, 0, 0.05);
}

.category-dropdown-option.selected {
    background: var(--accent-glow);
    color: var(--accent-hover);
    font-weight: 500;
}

.category-delete-btn {
    opacity: 0.7;
    transition: opacity 0.15s ease, transform 0.15s ease;
    font-size: 0.85rem;
    padding: 3px 6px !important;
}

.category-delete-btn:hover {
    opacity: 1;
    transform: scale(1.15);
}

.category-icon-picker-grid {
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    gap: 3px;
    padding: 3px;
    background: rgba(0, 0, 0, 0.15);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.category-icon-picker-grid .icon-selector-item {
    font-size: 0.95rem;
    border-radius: 6px;
    padding: 2px;
}

[data-theme="light"] .category-icon-picker-grid {
    background: rgba(0, 0, 0, 0.03);
}

/* --- Suggested Tags Cloud with Deletion --- */
.suggested-tags-container {
    max-height: 160px;
    overflow-y: auto;
}

.tag-suggestion-chip {
    display: inline-flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.8rem;
    color: var(--text-secondary);
    transition: all 0.15s ease;
    overflow: hidden;
}

[data-theme="light"] .tag-suggestion-chip {
    background: #f1f5f9;
    border-color: #cbd5e1;
    color: #475569;
}

.tag-suggestion-chip:hover {
    border-color: var(--accent-color);
    color: var(--text-primary);
}

.tag-suggestion-chip.assigned {
    background: var(--accent-glow);
    border-color: rgba(99, 102, 241, 0.4);
    color: var(--accent-color);
    font-weight: 500;
}

.tag-chip-name {
    padding: 4px 8px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.tag-count-badge {
    font-size: 0.68rem;
    background: rgba(255, 255, 255, 0.1);
    padding: 1px 4px;
    border-radius: 4px;
    opacity: 0.8;
}

[data-theme="light"] .tag-count-badge {
    background: rgba(0, 0, 0, 0.08);
}

.tag-chip-delete {
    background: none;
    border: none;
    border-left: 1px solid var(--border-color);
    color: #ef4444;
    padding: 4px 6px;
    cursor: pointer;
    font-size: 0.75rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    opacity: 0.7;
    transition: opacity 0.15s ease, background 0.15s ease;
}

.tag-chip-delete:hover {
    opacity: 1;
    background: rgba(239, 68, 68, 0.15);
}

/* --- Task Image Thumbnails & Attachment Controls --- */
.task-thumbnail-container {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    overflow: hidden;
    flex-shrink: 0;
    cursor: pointer;
    border: 1px solid var(--border-color);
    background: var(--bg-card);
    transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
    margin-left: 0.25rem;
    margin-right: 0.25rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.task-thumbnail-container:hover {
    transform: scale(1.08);
    border-color: var(--accent-color);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.task-thumbnail-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

/* Thumbnail in Task Details Title Row */
.task-detail-thumb-box {
    width: 44px;
    height: 44px;
    border-radius: 10px;
    overflow: hidden;
    cursor: pointer;
    border: 1px solid var(--border-color);
    background: var(--bg-card);
    transition: transform 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.task-detail-thumb-box:hover {
    transform: scale(1.05);
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.task-detail-thumb-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* Task Details Image Attachment Card */
.task-image-attachment-card {
    transition: var(--transition-fast);
}

.task-attachment-preview-img {
    width: 48px;
    height: 48px;
    border-radius: 8px;
    object-fit: cover;
    border: 1px solid var(--border-color);
    flex-shrink: 0;
}

.task-image-upload-dropzone {
    transition: border-color 0.2s ease, background 0.2s ease;
}

.task-image-upload-dropzone:hover {
    border-color: var(--accent-color) !important;
    background: rgba(255, 255, 255, 0.04) !important;
}

[data-theme="light"] .task-image-upload-dropzone:hover {
    background: rgba(0, 0, 0, 0.02) !important;
}

.upload-icon-circle {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background: var(--accent-glow);
    display: flex;
    align-items: center;
    justify-content: center;
}

/* --- Image Lightbox Modal --- */
.image-lightbox-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
    cursor: zoom-out;
}

.image-lightbox-container {
    position: relative;
    max-width: 90vw;
    max-height: 90vh;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: default;
}

.image-lightbox-img {
    max-width: 100%;
    max-height: 85vh;
    border-radius: 12px;
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.15);
    object-fit: contain;
}

.image-lightbox-close {
    position: absolute;
    top: -16px;
    right: -16px;
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: rgba(30, 41, 59, 0.95);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    transition: transform 0.15s ease, background 0.15s ease, color 0.15s ease;
    z-index: 10000;
}

.image-lightbox-close:hover {
    transform: scale(1.1);
    background: #ef4444;
    color: #ffffff;
}

@media (max-width: 576px) {
    .image-lightbox-overlay {
        padding: 0.75rem;
    }
    
    .image-lightbox-close {
        top: -12px;
        right: -12px;
        width: 32px;
        height: 32px;
        font-size: 0.9rem;
    }
    
    .task-thumbnail-container {
        width: 32px;
        height: 32px;
    }
}

/* --- 1. Subtle Category Background Colors (7 colors) --- */
.task-item-card.task-bg-rose {
    background: rgba(244, 63, 94, 0.09) !important;
}

[data-theme="light"] .task-item-card.task-bg-rose {
    background: rgba(254, 226, 226, 0.55) !important;
}

.task-item-card.task-bg-amber {
    background: rgba(245, 158, 11, 0.09) !important;
}

[data-theme="light"] .task-item-card.task-bg-amber {
    background: rgba(254, 243, 199, 0.55) !important;
}

.task-item-card.task-bg-yellow {
    background: rgba(234, 179, 8, 0.08) !important;
}

[data-theme="light"] .task-item-card.task-bg-yellow {
    background: rgba(254, 252, 232, 0.65) !important;
}

.task-item-card.task-bg-emerald {
    background: rgba(16, 185, 129, 0.09) !important;
}

[data-theme="light"] .task-item-card.task-bg-emerald {
    background: rgba(220, 252, 231, 0.55) !important;
}

.task-item-card.task-bg-sky {
    background: rgba(14, 165, 233, 0.09) !important;
}

[data-theme="light"] .task-item-card.task-bg-sky {
    background: rgba(224, 242, 254, 0.55) !important;
}

.task-item-card.task-bg-purple {
    background: rgba(168, 85, 247, 0.09) !important;
}

[data-theme="light"] .task-item-card.task-bg-purple {
    background: rgba(243, 232, 255, 0.55) !important;
}

.task-item-card.task-bg-pink {
    background: rgba(236, 72, 153, 0.09) !important;
}

[data-theme="light"] .task-item-card.task-bg-pink {
    background: rgba(252, 231, 243, 0.55) !important;
}

/* --- 2. Individual Task Border Colors (7 distinct vibrant colors) --- */
.task-item-card.task-border-crimson {
    border-color: #e11d48 !important;
    box-shadow: inset 3.5px 0 0 #e11d48, 0 2px 8px rgba(225, 29, 72, 0.18) !important;
}

.task-item-card.task-border-coral {
    border-color: #f97316 !important;
    box-shadow: inset 3.5px 0 0 #f97316, 0 2px 8px rgba(249, 115, 22, 0.18) !important;
}

.task-item-card.task-border-gold {
    border-color: #eab308 !important;
    box-shadow: inset 3.5px 0 0 #eab308, 0 2px 8px rgba(234, 179, 8, 0.18) !important;
}

.task-item-card.task-border-teal {
    border-color: #0d9488 !important;
    box-shadow: inset 3.5px 0 0 #0d9488, 0 2px 8px rgba(13, 148, 136, 0.18) !important;
}

.task-item-card.task-border-cobalt {
    border-color: #2563eb !important;
    box-shadow: inset 3.5px 0 0 #2563eb, 0 2px 8px rgba(37, 99, 235, 0.18) !important;
}

.task-item-card.task-border-indigo {
    border-color: #6366f1 !important;
    box-shadow: inset 3.5px 0 0 #6366f1, 0 2px 8px rgba(99, 102, 241, 0.18) !important;
}

.task-item-card.task-border-magenta {
    border-color: #c026d3 !important;
    box-shadow: inset 3.5px 0 0 #c026d3, 0 2px 8px rgba(192, 38, 211, 0.18) !important;
}

/* --- Category Color Swatches & Indicators in Details Modal --- */
.category-color-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    display: inline-block;
    flex-shrink: 0;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.category-color-dot-btn {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    border: 2px solid transparent;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 0.72rem;
    padding: 0;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.category-color-dot-btn:hover {
    transform: scale(1.2);
}

.category-color-dot-btn.active {
    border-color: var(--text-primary);
    box-shadow: 0 0 0 2px var(--accent-glow);
    transform: scale(1.15);
}

.category-color-dot-btn.swatch-none {
    background: var(--bg-input);
    border: 1px dashed var(--border-color);
    color: var(--text-muted);
}

.category-color-dot-btn.swatch-none.active {
    border-color: var(--accent-color);
    color: var(--accent-color);
}

/* --- Individual Task Border Color Swatches in Details --- */
.task-color-picker-row {
    padding: 2px 0;
}

.task-color-swatch {
    width: 34px;
    height: 34px;
    border-radius: 50%;
    border: 2px solid transparent;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: #ffffff;
    font-size: 1rem;
    font-weight: bold;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.6);
    transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
    padding: 0;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.15);
}

.task-color-swatch:hover {
    transform: scale(1.15);
    box-shadow: 0 3px 8px rgba(0, 0, 0, 0.25);
}

.task-color-swatch.active {
    transform: scale(1.1);
    border-color: var(--text-primary);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.task-color-swatch.swatch-none {
    background: var(--bg-input);
    border: 1.5px dashed var(--border-color);
    color: var(--text-muted);
}

.task-color-swatch.swatch-none.active {
    border-color: var(--accent-color);
    color: var(--accent-color);
}

/* --- Category Customization Box in Details Modal --- */
.category-customization-box {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 0.6rem 0.75rem;
    transition: var(--transition-fast);
}

[data-theme="light"] .category-customization-box {
    background: rgba(0, 0, 0, 0.02);
}

@media (max-width: 576px) {
    .category-customization-box {
        padding: 0.5rem 0.65rem;
    }
    .category-color-dot-btn {
        width: 22px;
        height: 22px;
    }
}

@media (max-width: 480px) {
    .details-header {
        padding: 0.75rem 0.85rem;
    }
    .details-header-title.title-size-xl {
        font-size: 1.28rem;
        font-weight: 700;
    }
    .details-header-title.title-size-lg {
        font-size: 1.12rem;
        font-weight: 650;
    }
    .details-header-title.title-size-md {
        font-size: 0.98rem;
        font-weight: 600;
    }
    .details-header-title.title-size-sm {
        font-size: 0.86rem;
        font-weight: 600;
    }
    .details-header-title.title-size-expanded {
        font-size: 0.92rem;
        font-weight: 600;
    }
}