:root {
    --bg-primary: #0a0e27;
    --bg-secondary: #151932;
    --bg-tertiary: #1a1f3a;
    --accent-primary: #00d9ff;
    --accent-secondary: #7b2cbf;
    --accent-success: #00ff88;
    --accent-warning: #ffd60a;
    --accent-danger: #ff006e;
    --text-primary: #e8eaed;
    --text-secondary: #a0a8b7;
    --text-muted: #6c7a8f;
    --border-color: #2a2f4a;
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    overflow-x: hidden;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    height: 100vh;
    overflow: hidden;
}

/* Demo Banner */
.demo-banner {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: linear-gradient(135deg, #ffd60a, #ff006e);
    color: #0a0e27;
    padding: 0.75rem 2rem;
    text-align: center;
    font-weight: 600;
    font-size: 0.85rem;
    z-index: 10000;
    box-shadow: 0 4px 20px rgba(0,0,0,0.3);
    display: flex;
    justify-content: center;
    align-items: center;
}

/* Main Grid Layout */
.app-container {
    display: grid;
    grid-template-columns: 300px 1fr;
    height: 100vh;
    overflow: hidden;
}

/* Sidebar */
.sidebar {
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    padding: 2rem 1.5rem;
    height: 100vh;
    display: flex;
    flex-direction: column;
    gap: 2rem;
    overflow-y: auto;
}

.logo {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
}

.logo-icon {
    color: var(--accent-primary);
    filter: drop-shadow(0 0 10px var(--accent-primary));
}

.logo-text h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.5px;
    margin-bottom: 0.25rem;
}

.ai-badge {
    font-size: 0.65rem;
    letter-spacing: 1.5px;
    color: var(--text-muted);
    font-weight: 600;
}

/* Stats Panel */
.stats-panel {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.stat-item {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1rem 1.25rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: border-color 0.2s;
}

.stat-item:hover {
    border-color: var(--accent-primary);
}

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

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-primary);
}

.stat-value.success { color: var(--accent-success); }
.stat-value.warning { color: var(--accent-warning); }
.stat-value.danger { color: var(--accent-danger); }

/* AI Recommendation */
.ai-recommendation {
    margin-top: auto;
}

.sidebar-footer {
    border-top: 1px solid var(--border-color);
    padding-top: 1.5rem;
}

.ai-label {
    font-size: 0.7rem;
    letter-spacing: 2px;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.btn-ai {
    width: 100%;
    padding: 1rem;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    border: none;
    border-radius: 12px;
    color: white;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: transform 0.2s, box-shadow 0.2s;
}

.btn-ai:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 217, 255, 0.3);
}

.pulse-dot {
    width: 8px;
    height: 8px;
    background: white;
    border-radius: 50%;
    animation: pulse 2s infinite;
}

.btn-learn-more {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    width: 100%;
    padding: 0.875rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.2s;
}

.btn-learn-more:hover {
    background: var(--bg-primary);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(0.8); }
}

/* Main Content */
.main-content {
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    padding: 2rem;
    padding-bottom: 80px;
}

/* Top Navigation */
.top-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    gap: 1rem;
    flex-shrink: 0;
}

.nav-filters {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.filter-chip {
    padding: 0.5rem 1rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-secondary);
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.2s;
}

.filter-chip:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.filter-chip.active {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: var(--bg-primary);
    font-weight: 600;
}

.btn-add {
    padding: 0.75rem 1.5rem;
    background: var(--accent-success);
    border: none;
    border-radius: 8px;
    color: var(--bg-primary);
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-add:hover {
    transform: scale(1.05);
}

.btn-add svg {
    filter: drop-shadow(0 0 2px currentColor);
}

/* AI Task Card */
.ai-task-card {
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
    border: 2px solid var(--accent-primary);
    border-radius: 16px;
    padding: 2rem;
    margin-bottom: 1.5rem;
    position: relative;
    box-shadow: 0 0 30px rgba(0, 217, 255, 0.2);
    flex-shrink: 0;
}

.ai-task-card.hidden {
    display: none;
}

.ai-badge-corner {
    position: absolute;
    top: -1px;
    right: -1px;
    background: var(--accent-primary);
    color: var(--bg-primary);
    padding: 0.5rem 1rem;
    border-radius: 0 14px 0 14px;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 1px;
}

.ai-task-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.ai-task-header h3 {
    font-size: 1.5rem;
    color: var(--text-primary);
    flex: 1;
}

.btn-close {
    background: var(--bg-tertiary);
    border: none;
    width: 32px;
    height: 32px;
    border-radius: 6px;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 1.2rem;
    transition: all 0.2s;
}

.btn-close:hover {
    background: var(--accent-danger);
    color: white;
}

.ai-task-desc {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.ai-metrics {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.metric {
    text-align: center;
}

.metric-label {
    display: block;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.metric-value {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-primary);
}

.metric-value.priority-score {
    color: var(--accent-warning);
}

.btn-complete {
    width: 100%;
    padding: 1rem;
    background: var(--accent-success);
    border: none;
    border-radius: 10px;
    color: var(--bg-primary);
    font-weight: 700;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-complete:hover {
    transform: scale(1.02);
    box-shadow: 0 4px 20px rgba(0, 255, 136, 0.3);
}

/* Add Task Form */
.add-form {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    flex-shrink: 0;
}

.add-form.hidden {
    display: none;
}

.form-inputs {
    display: grid;
    gap: 0.75rem;
    margin-bottom: 1.25rem;
}

.form-grid-ratings {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
    margin-bottom: 1.25rem;
}

.rating-group {
    display: flex;
    flex-direction: column;
}

.deadline-row {
    margin-bottom: 1.25rem;
}

.section-label {
    display: block;
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 0.6rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.input-field {
    width: 100%;
    padding: 0.75rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 0.95rem;
    transition: border-color 0.2s;
    font-family: inherit;
    resize: vertical;
}

.input-field:focus {
    outline: none;
    border-color: var(--accent-primary);
}

/* Rating Buttons */
.rating-buttons {
    display: grid;
    grid-template-columns: repeat(10, 1fr);
    gap: 0.4rem;
}

.rating-btn {
    padding: 0.6rem 0.25rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s;
}

.rating-btn:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
    transform: translateY(-1px);
}

.rating-btn.active {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: var(--bg-primary);
}

/* Deadline Options */
.deadline-options {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 0.5rem;
}

.deadline-btn {
    padding: 0.65rem 0.5rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s;
}

.deadline-btn:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.deadline-btn.active {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: var(--bg-primary);
}

.form-actions {
    display: flex;
    gap: 0.75rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.btn-submit {
    flex: 1;
    padding: 0.75rem;
    background: var(--accent-primary);
    border: none;
    border-radius: 8px;
    color: var(--bg-primary);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: transform 0.2s;
}

.btn-submit:hover {
    transform: scale(1.02);
}

.btn-cancel {
    padding: 0.75rem 1.25rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-secondary);
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-cancel:hover {
    border-color: var(--accent-danger);
    color: var(--accent-danger);
}

/* Task Grid */
.tasks-container {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
}

.task-grid {
    display: grid;
    gap: 1rem;
    padding-right: 0.5rem;
}

.task-item {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-left: 4px solid var(--accent-primary);
    border-radius: 12px;
    padding: 1.5rem;
    transition: all 0.2s;
}

.task-item:hover {
    border-left-width: 6px;
    transform: translateX(2px);
}

.task-item.completed {
    opacity: 0.5;
    border-left-color: var(--accent-success);
}

.task-item-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.task-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

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

.priority-badge {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    font-size: 0.85rem;
    color: var(--accent-warning);
    font-weight: 700;
}

.task-description {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    font-size: 0.95rem;
}

.task-meta {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
    margin-bottom: 1rem;
    padding: 1rem;
    background: var(--bg-tertiary);
    border-radius: 8px;
    font-size: 0.85rem;
}

.meta-item {
    color: var(--text-secondary);
}

.task-actions {
    display: flex;
    gap: 0.75rem;
}

.btn-success, .btn-danger {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s;
}

.btn-success {
    background: var(--accent-success);
    color: var(--bg-primary);
}

.btn-danger {
    background: var(--accent-danger);
    color: white;
}

.btn-success:hover, .btn-danger:hover {
    transform: scale(1.05);
}

.btn-small {
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
}

/* Loading & Empty States */
.loading-text, .loading {
    text-align: center;
    padding: 3rem;
    color: var(--text-muted);
    font-style: italic;
}

.empty-state {
    text-align: center;
    padding: 4rem 2rem;
}

.empty-state-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
    opacity: 0.3;
}

.empty-state p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Footer */
.footer {
    position: fixed;
    bottom: 0;
    left: 300px;
    right: 0;
    background: rgba(21, 25, 50, 0.95);
    border-top: 1px solid var(--border-color);
    padding: 1rem 2rem;
    z-index: 100;
    backdrop-filter: blur(20px);
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.3);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1400px;
}

.footer-content span {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.footer-content strong {
    color: var(--text-primary);
}

.github-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    transition: all 0.2s;
}

.github-link:hover {
    background: var(--bg-tertiary);
    color: var(--accent-primary);
}

.github-link svg {
    transition: transform 0.3s;
}

.github-link:hover svg {
    transform: rotate(360deg);
}

/* Responsive */
@media (max-width: 1024px) {
    .app-container {
        grid-template-columns: 1fr;
    }
    
    .sidebar {
        position: relative;
        width: 100%;
        height: auto;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }
    
    .main-content {
        margin-left: 0;
        padding: 1.5rem;
    }
    
    .footer {
        left: 0;
    }
    
    .ai-metrics {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .top-nav {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-filters {
        width: 100%;
    }
    
    .btn-add {
        width: 100%;
    }
}

@media (max-width: 768px) {
    body {
        padding-bottom: 80px;
    }
    
    .main-content {
        padding: 1rem;
    }
    
    .ai-metrics {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .task-meta {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 0.5rem;
        text-align: center;
    }
    
    .stats-panel {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .form-grid-ratings {
        grid-template-columns: 1fr;
    }
    
    .rating-buttons {
        grid-template-columns: repeat(5, 1fr);
    }
    
    .deadline-options {
        grid-template-columns: repeat(3, 1fr);
    }
}