:root {
    --bg-main: #0a0e17;
    --bg-surface: #111827;
    --bg-surface-elevated: #1e293b;
    --bg-glass: rgba(17, 24, 39, 0.75);
    --border-subtle: rgba(255, 255, 255, 0.08);
    --border-strong: rgba(255, 255, 255, 0.15);
    
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --primary-light: rgba(99, 102, 241, 0.15);
    --primary-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #d946ef 100%);
    
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #0ea5e9;

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 18px;
    --radius-xl: 24px;
    
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 10px 25px -5px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 20px 40px -10px rgba(0, 0, 0, 0.5);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
}

body {
    background-color: var(--bg-main);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

/* Ambient glow backgrounds */
.ambient-glow {
    position: fixed;
    border-radius: 50%;
    filter: blur(100px);
    pointer-events: none;
    z-index: 0;
    opacity: 0.35;
}

.glow-1 {
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, #6366f1 0%, transparent 70%);
    top: -100px;
    right: -100px;
}

.glow-2 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, #ec4899 0%, transparent 70%);
    bottom: -100px;
    left: -100px;
}

/* Layout */
.app-layout {
    display: flex;
    min-height: 100vh;
    position: relative;
    z-index: 1;
}

/* Sidebar */
.sidebar {
    width: 290px;
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-right: 1px solid var(--border-subtle);
    padding: 24px 20px;
    display: flex;
    flex-direction: column;
    gap: 24px;
    flex-shrink: 0;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 6px 8px;
}

.logo-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    background: var(--primary-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: 800;
    color: white;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

.brand-text h2 {
    font-size: 1.3rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.brand-tag {
    font-size: 0.72rem;
    color: var(--text-muted);
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.nav-menu {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 14px;
    border-radius: var(--radius-md);
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 0.92rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: left;
}

.nav-item:hover {
    background: rgba(255, 255, 255, 0.04);
    color: var(--text-primary);
}

.nav-item.active {
    background: var(--primary-light);
    color: #c7d2fe;
    border: 1px solid rgba(99, 102, 241, 0.3);
}

.nav-item .badge-count {
    margin-left: auto;
    font-size: 0.75rem;
    padding: 2px 8px;
    border-radius: 9999px;
    background: rgba(255, 255, 255, 0.06);
    color: var(--text-secondary);
}

.nav-item.active .badge-count {
    background: var(--primary);
    color: white;
}

.sidebar-section {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.section-title {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0 8px;
}

.btn-icon-sm {
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--border-subtle);
    color: var(--text-secondary);
    width: 22px;
    height: 22px;
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    transition: all 0.2s ease;
}

.btn-icon-sm:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.entity-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
    max-height: 140px;
    overflow-y: auto;
}

.entity-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
    background: transparent;
    border: none;
    width: 100%;
    text-align: left;
}

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

.entity-item.active {
    background: rgba(255, 255, 255, 0.06);
    color: var(--text-primary);
    font-weight: 600;
}

.entity-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    flex-shrink: 0;
}

.user-profile-card {
    margin-top: auto;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-subtle);
}

.user-avatar {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: var(--primary-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 14px;
    color: white;
    flex-shrink: 0;
}

.user-info {
    overflow: hidden;
    flex: 1;
}

.user-name {
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.user-role {
    font-size: 0.72rem;
    color: var(--success);
    font-weight: 500;
}

.btn-logout {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 18px;
    cursor: pointer;
    padding: 6px;
    border-radius: 6px;
    transition: all 0.2s ease;
}

.btn-logout:hover {
    background: rgba(239, 68, 68, 0.15);
    color: var(--danger);
}

/* Main Content */
.main-content {
    flex: 1;
    padding: 30px 40px;
    display: flex;
    flex-direction: column;
    gap: 26px;
    overflow-y: auto;
    max-height: 100vh;
}

/* Topbar */
.topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.topbar-left h1 {
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -0.02em;
}

.page-subtitle {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-top: 4px;
}

.topbar-actions {
    display: flex;
    align-items: center;
    gap: 14px;
}

.search-box {
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    padding: 8px 16px;
    border-radius: var(--radius-md);
    width: 260px;
    transition: all 0.2s ease;
}

.search-box:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.search-box input {
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-size: 0.88rem;
    width: 100%;
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    border: none;
    transition: all 0.2s ease;
}

.btn-primary {
    background: var(--primary-gradient);
    color: white;
    box-shadow: 0 4px 14px rgba(99, 102, 241, 0.35);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.5);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.06);
    color: var(--text-secondary);
    border: 1px solid var(--border-subtle);
}

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

/* Status Banner */
.status-banner {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 14px 20px;
    border-radius: var(--radius-md);
    background: rgba(14, 165, 233, 0.1);
    border: 1px solid rgba(14, 165, 233, 0.25);
    color: #e0f2fe;
}

.banner-content p {
    font-size: 0.85rem;
    color: #bae6fd;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
    gap: 16px;
}

.stat-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 16px;
    cursor: pointer;
    transition: all 0.25s ease;
}

.stat-card:hover {
    transform: translateY(-3px);
    border-color: var(--border-strong);
    box-shadow: var(--shadow-md);
}

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
}

.icon-todo { background: rgba(99, 102, 241, 0.12); color: var(--primary); }
.icon-progress { background: rgba(245, 158, 11, 0.12); color: var(--warning); }
.icon-done { background: rgba(16, 185, 129, 0.12); color: var(--success); }
.icon-overdue { background: rgba(239, 68, 68, 0.12); color: var(--danger); }

.stat-label {
    display: block;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.stat-value {
    display: block;
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--text-primary);
}

/* Filters Bar */
.filters-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 14px;
    padding: 12px 18px;
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
}

.filter-group {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.filter-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 600;
}

.chip {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-subtle);
    color: var(--text-secondary);
    padding: 6px 12px;
    border-radius: 9999px;
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

.chip.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.view-switch {
    display: flex;
    gap: 4px;
    background: rgba(0, 0, 0, 0.2);
    padding: 3px;
    border-radius: var(--radius-sm);
}

.btn-view {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 0.8rem;
    padding: 4px 10px;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
}

.btn-view.active {
    background: var(--bg-surface-elevated);
    color: var(--text-primary);
}

/* Tasks Grid Container */
.tasks-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 18px;
}

.tasks-container.view-list {
    grid-template-columns: 1fr;
}

/* Task Card */
.task-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 14px;
    transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    position: relative;
    overflow: hidden;
}

.task-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--border-subtle);
}

.task-card.priority-URGENT::before { background: var(--danger); }
.task-card.priority-HIGH::before { background: var(--warning); }
.task-card.priority-MEDIUM::before { background: var(--primary); }
.task-card.priority-LOW::before { background: var(--success); }

.task-card:hover {
    transform: translateY(-3px);
    border-color: var(--border-strong);
    box-shadow: var(--shadow-md);
}

.task-card.status-DONE {
    opacity: 0.65;
}

.task-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 10px;
}

.badge-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
}

.task-title {
    font-size: 1.05rem;
    font-weight: 700;
    line-height: 1.35;
    color: var(--text-primary);
}

.task-card.status-DONE .task-title {
    text-decoration: line-through;
    color: var(--text-muted);
}

.task-desc {
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.task-meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 12px;
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-top: auto;
    padding-top: 10px;
    border-top: 1px solid var(--border-subtle);
}

.meta-item {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.meta-item.overdue {
    color: var(--danger);
    font-weight: 700;
}

.task-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 4px;
}

.status-toggle-btn {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-subtle);
    color: var(--text-primary);
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.status-toggle-btn:hover {
    background: var(--primary);
    border-color: var(--primary);
}

.card-icon-actions {
    display: flex;
    gap: 6px;
}

.btn-card-action {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 15px;
    padding: 6px;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

.btn-card-action.btn-del:hover {
    background: rgba(239, 68, 68, 0.15);
    color: var(--danger);
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    background: var(--bg-surface);
    border: 1px dashed var(--border-subtle);
    border-radius: var(--radius-xl);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 14px;
}

.empty-icon {
    font-size: 48px;
}

.empty-state h3 {
    font-size: 1.3rem;
    font-weight: 700;
}

.empty-state p {
    color: var(--text-muted);
    max-width: 440px;
    font-size: 0.9rem;
    line-height: 1.5;
}

/* Modals */
.modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    padding: 20px;
    animation: fadeIn 0.2s ease-out;
}

.modal {
    background: var(--bg-surface);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-xl);
    width: 100%;
    max-width: 580px;
    box-shadow: var(--shadow-lg);
    padding: 30px;
    animation: scaleIn 0.2s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.modal-header h3 {
    font-size: 1.3rem;
    font-weight: 700;
}

.modal-close {
    background: transparent;
    border: none;
    font-size: 24px;
    color: var(--text-muted);
    cursor: pointer;
    line-height: 1;
}

.modal-close:hover {
    color: var(--text-primary);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 18px;
}

.form-row {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
}

.form-row .form-group {
    flex: 1;
    min-width: 140px;
}

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

.required {
    color: var(--danger);
}

input[type="text"],
input[type="date"],
select,
textarea {
    background: var(--bg-surface-elevated);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: 10px 14px;
    color: var(--text-primary);
    font-size: 0.9rem;
    outline: none;
    transition: all 0.2s ease;
    width: 100%;
}

input[type="text"]:focus,
input[type="date"]:focus,
select:focus,
textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.color-picker-input {
    height: 42px;
    padding: 4px;
    background: var(--bg-surface-elevated);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    cursor: pointer;
    width: 100%;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    margin-top: 10px;
}

/* Responsive */
@media (max-width: 900px) {
    .app-layout {
        flex-direction: column;
    }
    .sidebar {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--border-subtle);
    }
    .main-content {
        padding: 20px;
    }
}