:root {
    --color-base-950: #0a0c10;
    --color-base-900: #0f1218;
    --color-base-850: #141820;
    --color-base-800: #1a1f2a;
    --color-base-700: #242b3a;
    --color-base-600: #2e3849;
    --color-base-500: #3d4a5f;
    --color-base-400: #5a6a82;
    --color-base-300: #7d8ba0;
    --color-base-200: #a3aebe;
    --color-base-100: #c9d1dc;
    --color-base-50: #e8ecf0;
    --color-accent-500: #14b8a6;
    --color-accent-400: #2dd4bf;
    --color-accent-300: #5eead4;
    --color-accent-600: #0d9488;
    --color-accent-glow: rgba(20, 184, 166, 0.25);
    --color-accent-subtle: rgba(20, 184, 166, 0.08);
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    --glass-bg: rgba(20, 24, 32, 0.75);
    --glass-border: rgba(255, 255, 255, 0.06);
    --glass-hover: rgba(255, 255, 255, 0.04);
    --font-display: 'DM Sans', system-ui, sans-serif;
    --font-body: 'Plus Jakarta Sans', system-ui, sans-serif;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.25);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
}

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

body {
    font-family: var(--font-body);
    background: var(--color-base-950);
    color: var(--color-base-100);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    min-height: 100vh;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--space-6);
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-8);
    flex-wrap: wrap;
    gap: var(--space-4);
}

.brand {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.brand-mark {
    width: 44px;
    height: 44px;
    background: linear-gradient(135deg, var(--color-accent-500), var(--color-accent-400));
    color: var(--color-base-950);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.125rem;
    letter-spacing: -0.02em;
    box-shadow: 0 0 24px var(--color-accent-glow);
}

.brand-text {
    display: flex;
    flex-direction: column;
    line-height: 1.2;
}

.brand-name {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-base-50);
}

.brand-tag {
    font-size: 0.75rem;
    color: var(--color-base-400);
    font-weight: 500;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.header-right {
    display: flex;
    align-items: center;
    gap: var(--space-6);
    flex-wrap: wrap;
}

/* Status Pill */
.status-pill {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    color: var(--color-base-300);
    backdrop-filter: blur(12px);
}

.status-dot {
    width: 8px;
    height: 8px;
    background: var(--color-success);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

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

/* Filter Group */
.filter-group {
    display: flex;
    gap: var(--space-2);
    padding: var(--space-2);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(12px);
}

.filter-btn {
    padding: var(--space-2) var(--space-4);
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--color-base-300);
    font-family: var(--font-body);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.filter-btn:hover {
    background: var(--glass-hover);
    color: var(--color-base-100);
}

.filter-btn.active {
    background: var(--color-accent-subtle);
    color: var(--color-accent-400);
}

.filter-btn .count {
    background: rgba(255, 255, 255, 0.1);
    padding: 2px 8px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
}

.filter-btn.active .count {
    background: var(--color-accent-500);
    color: var(--color-base-950);
}

/* Main Grid */
.main {
    margin-top: var(--space-6);
}

#conversations-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
    gap: var(--space-5);
}

/* Conversation Card */
.conversation-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--space-5);
    backdrop-filter: blur(12px);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.conversation-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-accent-500), var(--color-accent-400));
    opacity: 0;
    transition: opacity var(--transition-base);
}

.conversation-card:hover {
    border-color: rgba(255, 255, 255, 0.12);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.conversation-card:hover::before {
    opacity: 1;
}

.conversation-card.answered {
    opacity: 0.7;
}

.conversation-card.answered::before {
    background: var(--color-success);
}

/* Card Header */
.card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--space-4);
    gap: var(--space-3);
}

.card-meta {
    flex: 1;
    min-width: 0;
}

.card-title {
    font-family: var(--font-display);
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-base-50);
    margin-bottom: var(--space-2);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.card-subtitle {
    font-size: 0.875rem;
    color: var(--color-base-400);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.card-subtitle svg {
    width: 14px;
    height: 14px;
    opacity: 0.6;
}

.status-badge {
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    white-space: nowrap;
}

.status-badge.unanswered {
    background: rgba(245, 158, 11, 0.15);
    color: var(--color-warning);
}

.status-badge.answered {
    background: rgba(16, 185, 129, 0.15);
    color: var(--color-success);
}

/* Card Body */
.card-body {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    margin-bottom: var(--space-5);
}

.info-row {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.info-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-base-400);
}

.info-value {
    font-size: 0.9375rem;
    color: var(--color-base-100);
    line-height: 1.5;
}

.summary-text {
    padding: var(--space-3);
    background: rgba(0, 0, 0, 0.2);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.04);
    font-size: 0.875rem;
    line-height: 1.6;
    color: var(--color-base-200);
}

.intent-tag {
    display: inline-block;
    padding: 4px 10px;
    background: var(--color-accent-subtle);
    color: var(--color-accent-400);
    border-radius: var(--radius-md);
    font-size: 0.75rem;
    font-weight: 500;
}

/* Card Footer */
.card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--space-4);
    border-top: 1px solid var(--glass-border);
    gap: var(--space-3);
}

.card-time {
    font-size: 0.8125rem;
    color: var(--color-base-400);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.card-time svg {
    width: 14px;
    height: 14px;
    opacity: 0.6;
}

.btn-answer {
    padding: var(--space-2) var(--space-4);
    background: var(--color-accent-500);
    color: var(--color-base-950);
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font-body);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.btn-answer:hover {
    background: var(--color-accent-400);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px var(--color-accent-glow);
}

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

.btn-answer:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.btn-answer svg {
    width: 16px;
    height: 16px;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: var(--space-8);
    color: var(--color-base-400);
    grid-column: 1 / -1;
}

.empty-state svg {
    margin: 0 auto var(--space-5);
    opacity: 0.3;
}

.empty-state h3 {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-base-300);
    margin-bottom: var(--space-2);
}

.empty-state p {
    font-size: 0.9375rem;
    color: var(--color-base-400);
}

/* Loading Spinner */
.spinner {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-top-color: currentColor;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

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

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: var(--space-4);
    }
    
    .header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .header-right {
        width: 100%;
        flex-direction: column;
        align-items: stretch;
    }
    
    .filter-group {
        width: 100%;
    }
    
    .filter-btn {
        flex: 1;
        justify-content: center;
    }
    
    #conversations-grid {
        grid-template-columns: 1fr;
    }
}