/* =============================================================================
   Intent Classification UI - Premium Dark Theme
   ============================================================================= */

:root {
    /* Color Palette */
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-tertiary: #1a1a24;
    --bg-elevated: #22222e;
    
    --text-primary: #f0f0f5;
    --text-secondary: #a0a0b0;
    --text-muted: #606075;
    
    --accent-primary: #6366f1;
    --accent-secondary: #818cf8;
    --accent-glow: rgba(99, 102, 241, 0.3);
    
    --success: #22c55e;
    --success-glow: rgba(34, 197, 94, 0.2);
    --warning: #f59e0b;
    --error: #ef4444;
    
    --border-subtle: rgba(255, 255, 255, 0.06);
    --border-light: rgba(255, 255, 255, 0.1);
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    
    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    
    /* Borders */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 40px var(--accent-glow);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 400ms ease;
}

/* =============================================================================
   Reset & Base
   ============================================================================= */

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

/* =============================================================================
   Layout
   ============================================================================= */

.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-subtle);
    padding: var(--space-md) var(--space-xl);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(12px);
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.logo-icon {
    font-size: 1.5rem;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.1); opacity: 0.8; }
}

.logo h1 {
    font-size: 1.25rem;
    font-weight: 600;
    background: linear-gradient(135deg, var(--text-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.version-badge {
    background: var(--bg-elevated);
    color: var(--accent-secondary);
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 500;
    border: 1px solid var(--border-light);
}

.main-content {
    flex: 1;
    max-width: 1400px;
    width: 100%;
    margin: 0 auto;
    padding: var(--space-xl);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
}

@media (max-width: 1024px) {
    .main-content {
        grid-template-columns: 1fr;
    }
}

/* =============================================================================
   Panels
   ============================================================================= */

.panel {
    background: var(--bg-secondary);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.panel-header h2 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* =============================================================================
   Status Indicator
   ============================================================================= */

.status-indicator {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 0.875rem;
    color: var(--text-muted);
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--success);
    box-shadow: 0 0 8px var(--success-glow);
    animation: statusPulse 2s ease-in-out infinite;
}

@keyframes statusPulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.status-indicator.loading .status-dot {
    background: var(--warning);
    animation: statusSpin 0.8s linear infinite;
}

@keyframes statusSpin {
    to { transform: rotate(360deg); }
}

/* =============================================================================
   Form Elements
   ============================================================================= */

.input-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.input-group label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.input-row {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--space-md);
}

textarea,
input,
select {
    font-family: var(--font-sans);
    font-size: 0.9375rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    color: var(--text-primary);
    transition: all var(--transition-fast);
    outline: none;
}

textarea {
    resize: vertical;
    min-height: 100px;
}

textarea:focus,
input:focus,
select:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

textarea::placeholder {
    color: var(--text-muted);
}

select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='%23a0a0b0' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10l-5 5z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 40px;
}

/* =============================================================================
   Buttons
   ============================================================================= */

.classify-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    border: none;
    border-radius: var(--radius-md);
    padding: var(--space-md) var(--space-lg);
    font-family: var(--font-sans);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.classify-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, transparent, rgba(255,255,255,0.1), transparent);
    transform: translateX(-100%);
    transition: transform 0.6s ease;
}

.classify-btn:hover::before {
    transform: translateX(100%);
}

.classify-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

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

.classify-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.btn-icon {
    font-size: 1.1rem;
}

.copy-btn {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-sm);
    padding: var(--space-sm);
    cursor: pointer;
    font-size: 1rem;
    transition: all var(--transition-fast);
}

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

/* =============================================================================
   Examples Section
   ============================================================================= */

.examples-section {
    margin-top: var(--space-md);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--border-subtle);
}

.examples-section h3 {
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--text-muted);
    margin-bottom: var(--space-md);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.examples-grid {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.example-chip {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-full);
    padding: var(--space-xs) var(--space-md);
    font-size: 0.8125rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.example-chip:hover {
    background: var(--bg-elevated);
    border-color: var(--accent-primary);
    color: var(--text-primary);
}

.example-chip .chip-category {
    display: inline-block;
    background: rgba(99, 102, 241, 0.2);
    color: var(--accent-secondary);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    font-size: 0.6875rem;
    font-weight: 500;
    margin-left: var(--space-xs);
}

/* =============================================================================
   Results Display
   ============================================================================= */

.result-container {
    flex: 1;
    min-height: 300px;
}

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    min-height: 300px;
    color: var(--text-muted);
    text-align: center;
}

.empty-icon {
    font-size: 3rem;
    margin-bottom: var(--space-md);
    opacity: 0.5;
}

.result-content {
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Intent Cards */
.intent-card {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
    margin-bottom: var(--space-md);
}

.intent-header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
}

.intent-c1 {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.intent-c2 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.confidence-bar {
    height: 6px;
    background: var(--bg-elevated);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: var(--space-sm);
}

.confidence-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-primary), var(--success));
    border-radius: var(--radius-full);
    transition: width 0.5s ease;
}

.confidence-label {
    font-size: 0.8125rem;
    color: var(--text-muted);
}

.confidence-value {
    color: var(--success);
    font-weight: 600;
}

/* Meta Info */
.meta-section {
    margin-top: var(--space-md);
    padding-top: var(--space-md);
    border-top: 1px solid var(--border-subtle);
}

.meta-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--space-sm);
}

.meta-item {
    background: var(--bg-secondary);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-sm);
}

.meta-label {
    font-size: 0.6875rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.meta-value {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
    font-family: var(--font-mono);
}

/* JSON Output */
.json-output {
    background: var(--bg-primary);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    margin-top: var(--space-md);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    line-height: 1.6;
    color: var(--text-secondary);
    overflow-x: auto;
    max-height: 200px;
}

.json-key { color: var(--accent-secondary); }
.json-string { color: var(--success); }
.json-number { color: var(--warning); }
.json-boolean { color: #f472b6; }
.json-null { color: var(--text-muted); }

/* =============================================================================
   Footer
   ============================================================================= */

.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-subtle);
    padding: var(--space-md) var(--space-xl);
    text-align: center;
}

.footer p {
    font-size: 0.8125rem;
    color: var(--text-muted);
}

/* =============================================================================
   Responsive
   ============================================================================= */

@media (max-width: 768px) {
    .main-content {
        padding: var(--space-md);
    }
    
    .input-row {
        grid-template-columns: 1fr;
    }
    
    .panel {
        padding: var(--space-md);
    }
}