:root {
            --bg-color: #0b0f19;
            --card-bg: rgba(22, 30, 49, 0.65);
            --border-color: rgba(255, 255, 255, 0.08);
            --primary-glow: linear-gradient(135deg, #00f2fe 0%, #4facfe 100%);
            --accent-glow: linear-gradient(135deg, #ff0844 0%, #ffb199 100%);
            --text-main: #f3f4f6;
            --text-muted: #9ca3af;
            --accent-blue: #00f2fe;
            --font-display: 'Space Grotesk', sans-serif;
            --font-body: 'Outfit', sans-serif;
        }

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

        body {
            background-color: var(--bg-color);
            background-image: 
                radial-gradient(circle at 10% 20%, rgba(0, 242, 254, 0.05) 0%, transparent 40%),
                radial-gradient(circle at 90% 80%, rgba(255, 8, 68, 0.05) 0%, transparent 40%);
            color: var(--text-main);
            font-family: var(--font-body);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            align-items: center;
            overflow-x: hidden;
        }

        header {
            width: 100%;
            max-width: 1800px;
            padding: 2.5rem 2rem 1.5rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .logo-card-header {
            display: flex;
            justify-content: center;
            align-items: center;
            width: 100%;
            padding-bottom: 1rem;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
            margin-bottom: 0.5rem;
        }

        .logo-img {
            height: 5.5rem;
            width: auto;
            object-fit: contain;
            display: block;
            filter: brightness(0) invert(1);
        }

        main {
            width: 100%;
            max-width: 1500px;
            padding: 2rem;
            flex-grow: 1;
            display: flex;
            flex-direction: column;
            justify-content: center;
            gap: 0.5rem;
        }

        .hero-section {
            text-align: center;
        }

        h1 {
            font-family: var(--font-display);
            font-size: 3rem;
            font-weight: 700;
            letter-spacing: -0.03em;
            line-height: 1.15;
            margin-bottom: 0.75rem;
        }

        h1 span {
            background: var(--primary-glow);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .subtitle {
            color: var(--text-muted);
            font-size: 1.15rem;
            max-width: 900px;
            margin: 0 auto;
            line-height: 1.5;
        }

        .app-container {
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            border-radius: 1.5rem;
            backdrop-filter: blur(16px);
            padding: 2.5rem;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
            display: grid;
            grid-template-columns: 0.5fr 2.5fr;
            gap: 2.5rem;
            position: relative;
        }

        @media (max-width: 768px) {
            .app-container {
                grid-template-columns: 1fr;
            }
        }

        .form-section {
            display: flex;
            flex-direction: column;
            gap: 1.5rem;
        }

        .drop-section {
            display: flex;
            flex-direction: column;
            justify-content: center;
        }

        .input-group {
            display: flex;
            flex-direction: column;
            gap: 0.5rem;
        }

        label {
            font-family: var(--font-display);
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--text-main);
            display: flex;
            justify-content: space-between;
        }

        label span {
            color: var(--accent-blue);
        }

        input[type="range"] {
            -webkit-appearance: none;
            width: 100%;
            height: 6px;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 3px;
            outline: none;
        }

        input[type="range"]::-webkit-slider-thumb {
            -webkit-appearance: none;
            width: 18px;
            height: 18px;
            border-radius: 50%;
            background: var(--accent-blue);
            cursor: pointer;
            box-shadow: 0 0 10px rgba(0, 242, 254, 0.5);
            transition: transform 0.1s ease;
        }

        input[type="range"]::-webkit-slider-thumb:hover {
            transform: scale(1.2);
        }

        /* Select dropdown styling */
        select {
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid var(--border-color);
            border-radius: 0.5rem;
            color: var(--text-main);
            font-family: var(--font-body);
            font-size: 0.95rem;
            padding: 0.75rem;
            outline: none;
            cursor: pointer;
            transition: border-color 0.2s ease;
            width: 100%;
        }
        select:focus {
            border-color: var(--accent-blue);
        }
        select option {
            background: #161e31;
            color: var(--text-main);
        }

        /* Dropzone Styling */
        .dropzone {
            border: 2px dashed rgba(255, 255, 255, 0.15);
            border-radius: 1.25rem;
            padding: 1rem 1.5rem;
            text-align: center;
            cursor: pointer;
            background: rgba(255, 255, 255, 0.02);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            min-height: 120px;
        }

        .dropzone.dragover {
            border-color: var(--accent-blue);
            background: rgba(0, 242, 254, 0.05);
            box-shadow: 0 0 30px rgba(0, 242, 254, 0.1);
            transform: translateY(-2px);
        }

        .dropzone-icon {
            width: 2.5rem;
            height: 2.5rem;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.03);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--text-muted);
            border: 1px solid var(--border-color);
            transition: all 0.3s ease;
        }

        .dropzone.dragover .dropzone-icon {
            background: var(--primary-glow);
            color: var(--bg-color);
            box-shadow: 0 0 20px rgba(0, 242, 254, 0.3);
            border-color: transparent;
        }

        .dropzone-title {
            font-family: var(--font-display);
            font-size: 1.1rem;
            font-weight: 600;
        }

        .dropzone-subtitle {
            font-size: 0.85rem;
            color: var(--text-muted);
        }

        .file-input {
            display: none;
        }

        /* Compensate Button */
        .btn-submit {
            background: var(--primary-glow);
            color: var(--bg-color);
            font-family: var(--font-display);
            font-size: 1.1rem;
            font-weight: 700;
            padding: 1.1rem;
            border: none;
            border-radius: 1rem;
            cursor: pointer;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            box-shadow: 0 10px 20px rgba(0, 242, 254, 0.2);
            width: 100%;
            margin-top: 1.5rem;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
        }

        .btn-submit:hover {
            transform: translateY(-2px);
            box-shadow: 0 15px 30px rgba(0, 242, 254, 0.4);
        }

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

        .btn-submit:disabled {
            background: var(--text-muted);
            box-shadow: none;
            cursor: not-allowed;
            opacity: 0.5;
            transform: none;
        }

        /* Status & Processing */
        .status-container {
            margin-top: 1rem;
            padding: 1rem;
            border-radius: 0.75rem;
            background: rgba(255, 255, 255, 0.03);
            border: 1px solid var(--border-color);
            font-size: 0.9rem;
            text-align: center;
            display: none;
        }

        .status-success {
            border-color: rgba(16, 185, 129, 0.3);
            background: rgba(16, 185, 129, 0.05);
            color: #34d399;
        }

        .status-error {
            border-color: rgba(239, 68, 68, 0.3);
            background: rgba(239, 68, 68, 0.05);
            color: #f87171;
        }

        .spinner {
            width: 1.25rem;
            height: 1.25rem;
            border: 3px solid rgba(11, 15, 25, 0.3);
            border-top-color: var(--bg-color);
            border-radius: 50%;
            animation: spin 1s linear infinite;
            display: none;
        }

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

        /* Results Panel Styles */
        .results-container {
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            border-radius: 1.5rem;
            backdrop-filter: blur(16px);
            padding: 2.5rem;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
            display: flex;
            flex-direction: column;
            gap: 2rem;
            animation: fadeIn 0.5s ease forwards;
            margin-top: 2rem;
        }

        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(15px); }
            to { opacity: 1; transform: translateY(0); }
        }

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

        .results-title {
            font-family: var(--font-display);
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--accent-blue);
        }

        .results-grid {
            display: grid;
            grid-template-columns: 1fr 1.2fr;
            gap: 2.5rem;
        }

        @media (max-width: 768px) {
            .results-grid {
                grid-template-columns: 1fr;
            }
        }

        .results-column {
            display: flex;
            flex-direction: column;
            gap: 1.5rem;
        }

        .results-section-title {
            font-family: var(--font-display);
            font-size: 1.1rem;
            font-weight: 600;
            color: var(--text-main);
            margin-bottom: 0.75rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .results-section-title svg {
            color: var(--accent-blue);
        }

        .metric-card {
            background: rgba(255, 255, 255, 0.02);
            border: 1px solid var(--border-color);
            border-radius: 0.75rem;
            padding: 1.25rem;
            display: flex;
            flex-direction: column;
            gap: 0.75rem;
        }

        .metric-row {
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 0.95rem;
        }

        .metric-label {
            color: var(--text-muted);
        }

        .metric-value {
            font-weight: 600;
            color: var(--text-main);
        }

        .metric-value.highlight {
            color: var(--accent-blue);
        }

        .density-progress-container {
            margin-top: 0.5rem;
        }

        .density-progress-bar {
            height: 8px;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 4px;
            overflow: hidden;
            position: relative;
            margin: 0.5rem 0 0.25rem 0;
        }

        .density-progress-fill {
            height: 100%;
            background: var(--primary-glow);
            border-radius: 4px;
            width: 0%;
            transition: width 1.2s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .density-rating {
            font-size: 0.8rem;
            color: var(--text-muted);
            text-align: right;
            margin-top: 0.25rem;
        }

        .recommendation-card {
            background: rgba(0, 242, 254, 0.03);
            border: 1px solid rgba(0, 242, 254, 0.15);
            border-radius: 0.75rem;
            padding: 1.25rem;
            display: flex;
            flex-direction: column;
            gap: 0.75rem;
        }

        .recommendation-badge {
            align-self: flex-start;
            background: var(--primary-glow);
            color: var(--bg-color);
            font-family: var(--font-display);
            font-size: 0.75rem;
            font-weight: 700;
            padding: 0.25rem 0.6rem;
            border-radius: 0.25rem;
            text-transform: uppercase;
            letter-spacing: 0.05em;
        }

        .recommendation-text {
            font-size: 0.95rem;
            line-height: 1.45;
            color: var(--text-main);
        }

        .slicing-list {
            display: flex;
            flex-direction: column;
            gap: 0.75rem;
            list-style-type: none;
        }

        .slicing-item {
            font-size: 0.9rem;
            line-height: 1.45;
            padding-left: 1.5rem;
            position: relative;
            color: var(--text-muted);
        }

        .slicing-item strong {
            color: var(--text-main);
        }

        .slicing-item::before {
            content: "\2726";
            color: var(--accent-blue);
            font-size: 0.85rem;
            position: absolute;
            left: 0.25rem;
            top: 0.1rem;
        }

        footer {
            padding: 2.5rem;
            text-align: center;
            font-size: 0.85rem;
            color: var(--text-muted);
            border-top: 1px solid var(--border-color);
            width: 100%;
            max-width: 1800px;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .footer-links {
            display: flex;
            gap: 1.5rem;
        }

        .footer-links a {
            color: var(--text-muted);
            text-decoration: none;
            transition: color 0.2s ease;
        }

        .footer-links a:hover {
            color: var(--accent-blue);
        }

        .training-explanation-card {
            background: rgba(22, 30, 49, 0.4);
            border: 1px solid var(--border-color);
            border-radius: 1rem;
            padding: 1.5rem;
            margin-top: 1.5rem;
            width: 100%;
        }

        .training-grid {
            display: grid;
            grid-template-columns: 2fr 1fr;
            gap: 2rem;
            margin-top: 1rem;
        }

        @media (max-width: 768px) {
            .training-grid {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }
        }

        .training-text {
            font-size: 0.95rem;
            line-height: 1.6;
            color: var(--text-muted);
            display: flex;
            flex-direction: column;
            gap: 0.75rem;
        }

        .training-text strong {
            color: var(--text-main);
        }

        .training-text ul {
            padding-left: 1.25rem;
            display: flex;
            flex-direction: column;
            gap: 0.5rem;
        }

        .training-text li {
            list-style-type: square;
            color: var(--text-muted);
        }

        .training-text li strong {
            color: var(--accent-blue);
        }

        .training-stats {
            display: flex;
            flex-direction: column;
            gap: 1rem;
            justify-content: center;
        }

        .stat-box {
            background: rgba(255, 255, 255, 0.02);
            border: 1px solid var(--border-color);
            border-radius: 0.75rem;
            padding: 1rem;
            text-align: center;
            transition: all 0.3s ease;
        }

        .stat-box:hover {
            border-color: var(--accent-blue);
            background: rgba(0, 242, 254, 0.02);
            transform: translateY(-2px);
        }

        .stat-value {
            display: block;
            font-family: var(--font-display);
            font-size: 1.75rem;
            font-weight: 700;
            background: var(--primary-glow);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            margin-bottom: 0.25rem;
        }

        .stat-box-container {
            display: grid;
            grid-template-columns: 1fr 1fr 1fr;
            gap: 1rem;
        }

        @media (max-width: 480px) {
            .stat-box-container {
                grid-template-columns: 1fr;
            }
        }

        .stat-label {
            font-size: 0.8rem;
            color: var(--text-muted);
            text-transform: uppercase;
            letter-spacing: 0.05em;
        }
        .navigation-tabs {
            display: flex;
            gap: 1rem;
            margin-bottom: 1.5rem;
            justify-content: center;
            width: 100%;
        }

        .nav-tab {
            background: rgba(22, 30, 49, 0.4);
            border: 1px solid var(--border-color);
            border-radius: 0.75rem;
            color: var(--text-muted);
            padding: 0.75rem 1.5rem;
            font-family: var(--font-display);
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .nav-tab:hover {
            color: var(--text-main);
            border-color: rgba(255, 255, 255, 0.15);
            background: rgba(22, 30, 49, 0.6);
        }

        .nav-tab.active {
            background: var(--primary-glow);
            color: var(--bg-color);
            border-color: transparent;
            box-shadow: 0 4px 15px rgba(0, 242, 254, 0.25);
        }

        .admin-file-card:hover {
            border-color: var(--accent-blue) !important;
            background: rgba(0, 242, 254, 0.05) !important;
            color: var(--text-main) !important;
        }
        
        .admin-file-card.has-file {
            border-color: #00e676 !important;
            background: rgba(0, 230, 118, 0.05) !important;
            color: #00e676 !important;
        }
        
        .admin-file-card.has-file svg {
            color: #00e676 !important;
        }

        @media (max-width: 768px) {
            .admin-grid {
                grid-template-columns: 1fr !important;
                gap: 2rem !important;
            }
        }

        /* 3D Viewport styling */
        .viewport-section {
            display: flex;
            flex-direction: column;
            gap: 1.25rem;
            background: rgba(255, 255, 255, 0.02);
            border: 1px solid var(--border-color);
            border-radius: 1.25rem;
            padding: 1.5rem;
        }

        .viewport-container {
            width: 100%;
            height: 380px;
            background: rgba(11, 15, 25, 0.6);
            border: 1px solid var(--border-color);
            border-radius: 1rem;
            position: relative;
            overflow: hidden;
        }

        .viewport-placeholder {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            color: var(--text-muted);
            text-align: center;
            padding: 2rem;
            gap: 0.75rem;
            font-family: var(--font-body);
        }

        .viewport-placeholder svg {
            stroke: var(--text-muted);
            opacity: 0.4;
            animation: pulse 2s infinite ease-in-out;
        }

        @keyframes pulse {
            0%, 100% { opacity: 0.4; }
            50% { opacity: 0.8; }
        }

        .view-modes {
            display: flex;
            gap: 0.5rem;
            flex-wrap: wrap;
        }

        .view-mode-btn {
            flex: 1;
            min-width: 100px;
            padding: 0.6rem 0.75rem;
            border-radius: 0.5rem;
            border: 1px solid var(--border-color);
            background: rgba(255, 255, 255, 0.03);
            color: var(--text-muted);
            font-family: var(--font-display);
            font-size: 0.8rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.2s ease;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 0.4rem;
        }

        .view-mode-btn:hover {
            background: rgba(255, 255, 255, 0.06);
            color: var(--text-main);
        }

        .view-mode-btn.active[data-mode="nominal"] {
            border-color: #3b82f6;
            color: #3b82f6;
            background: rgba(59, 130, 246, 0.1);
        }

        .view-mode-btn.active[data-mode="deformed"] {
            border-color: #fbbf24;
            color: #fbbf24;
            background: rgba(251, 191, 36, 0.1);
        }

        .view-mode-btn.active[data-mode="compensated"] {
            border-color: #34c759;
            color: #34c759;
            background: rgba(52, 199, 89, 0.1);
        }

        .view-mode-indicator {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            display: inline-block;
        }

        .view-mode-btn[data-mode="nominal"] .view-mode-indicator { background: #3b82f6; }
        .view-mode-btn[data-mode="deformed"] .view-mode-indicator { background: #ef4444; }
        .view-mode-btn[data-mode="compensated"] .view-mode-indicator { background: #34c759; }

        .sim-slider-container {
            display: flex;
            flex-direction: column;
            gap: 0.5rem;
            border-top: 1px solid var(--border-color);
            padding-top: 1rem;
        }

        .sim-slider-header {
            display: flex;
            justify-content: space-between;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--text-muted);
        }

        .sim-slider-header span span {
            color: var(--text-main);
        }

        .viewport-metrics {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1rem;
        }

        .metric-sub-card {
            background: rgba(11, 15, 25, 0.4);
            border: 1px solid var(--border-color);
            border-radius: 0.75rem;
            padding: 0.75rem 1rem;
        }

        .metric-sub-card-label {
            font-size: 0.75rem;
            text-transform: uppercase;
            letter-spacing: 0.05em;
            color: var(--text-muted);
            margin-bottom: 0.25rem;
        }

        .metric-sub-card-value {
            font-family: var(--font-display);
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--text-main);
        }

        .metric-sub-card-value.warning {
            color: #ff8b8b;
        }

        /* Results chart card style */
        .results-chart-card {
            margin-top: 2rem;
            background: rgba(22, 30, 49, 0.4);
            border: 1px solid var(--border-color);
            border-radius: 1.25rem;
            padding: 1.75rem;
        }
    
/* AI Chat Assistant Styles */
#ai-chat-fab {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--primary-glow);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(0, 242, 254, 0.4);
    z-index: 9999;
    transition: transform 0.2s, box-shadow 0.2s;
}
#ai-chat-fab:hover {
    transform: scale(1.05);
    box-shadow: 0 6px 20px rgba(0, 242, 254, 0.6);
}
#ai-chat-window {
    position: fixed;
    bottom: 100px;
    right: 30px;
    width: 520px;
    height: 600px;
    max-height: 80vh;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 1.25rem;
    backdrop-filter: blur(16px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
    z-index: 9998;
    display: none;
    flex-direction: column;
    overflow: hidden;
    animation: chatSlideUp 0.3s ease-out;
}
@keyframes chatSlideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}
.chat-header {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(255,255,255,0.02);
}
.chat-header-title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.chat-close-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 1.2rem;
    transition: color 0.2s;
}
.chat-close-btn:hover { color: var(--text-main); }
.chat-provider-select {
    background: rgba(0,0,0,0.3);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    border-radius: 0.5rem;
    padding: 0.3rem;
    font-size: 0.8rem;
    font-family: var(--font-body);
}
.chat-messages {
    flex-grow: 1;
    overflow-y: auto;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}
.chat-message {
    max-width: 85%;
    padding: 0.8rem 1rem;
    border-radius: 1rem;
    font-size: 0.95rem;
    line-height: 1.4;
}
.chat-message.user {
    align-self: flex-end;
    background: rgba(0, 242, 254, 0.15);
    border: 1px solid rgba(0, 242, 254, 0.3);
    border-bottom-right-radius: 0.25rem;
}
.chat-message.assistant {
    align-self: flex-start;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-bottom-left-radius: 0.25rem;
}
.ai-speaking-glow {
    animation: aiGlowPulse 1.5s ease-in-out infinite;
    box-shadow: 0 0 15px 0px rgba(0, 242, 254, 0.4);
    border: 1px solid rgba(0, 242, 254, 0.6) !important;
}
@keyframes aiGlowPulse {
    0% {
        box-shadow: 0 0 10px 0px rgba(0, 242, 254, 0.2);
    }
    50% {
        box-shadow: 0 0 25px 5px rgba(0, 242, 254, 0.6);
    }
    100% {
        box-shadow: 0 0 10px 0px rgba(0, 242, 254, 0.2);
    }
}
.chat-input-container {
    padding: 1rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 0.5rem;
    background: rgba(255,255,255,0.01);
}
.chat-input {
    flex-grow: 1;
    background: rgba(0,0,0,0.3);
    border: 1px solid var(--border-color);
    border-radius: 2rem;
    padding: 0.75rem 1rem;
    color: var(--text-main);
    font-family: var(--font-body);
    font-size: 0.95rem;
}
.chat-input:focus {
    outline: none;
    border-color: rgba(0, 242, 254, 0.5);
}
.chat-send-btn {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background: var(--button-bg);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
}
.chat-send-btn:hover { background: rgba(0, 242, 254, 0.2); }
.chat-mic-btn, .chat-stop-btn {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background: var(--button-bg);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
}
.chat-mic-btn:hover, .chat-stop-btn:hover { background: rgba(0, 242, 254, 0.2); }
.chat-mic-btn.recording {
    background: rgba(255, 8, 68, 0.2);
    border-color: #ff0844;
    color: #ff0844;
    animation: pulseMic 1.5s infinite;
}
@keyframes pulseMic {
    0% { box-shadow: 0 0 0 0 rgba(255, 8, 68, 0.4); }
    70% { box-shadow: 0 0 0 10px rgba(255, 8, 68, 0); }
    100% { box-shadow: 0 0 0 0 rgba(255, 8, 68, 0); }
}
.chat-speed-slider {
    width: 60px;
    cursor: pointer;
}
.typing-indicator {
    display: none;
    align-self: flex-start;
    padding: 0.5rem 1rem;
    background: rgba(255, 255, 255, 0.02);
    border-radius: 1rem;
    font-size: 0.8rem;
    color: var(--text-muted);
}