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

:root {
    --primary-color: #667eea;
    --primary-dark: #5568d3;
    --secondary-color: #764ba2;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --info-color: #3b82f6;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-900: #111827;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang TC', sans-serif;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    padding: 0;
    margin: 0;
}

.container {
    width: 100%;
    max-width: 800px;
    height: 100vh;
    background: white;
    display: flex;
    flex-direction: column;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

/* Header */
.app-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 20px;
    text-align: center;
    flex-shrink: 0;
}

.app-header h1 {
    font-size: 2rem;
    margin: 0 0 5px 0;
}

.subtitle {
    font-size: 0.9rem;
    opacity: 0.9;
    margin: 0;
}

/* Content Area (Scrollable) */
.content-area {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding-bottom: 0px;
}

/* Settings Panel */
.settings-panel {
    border-bottom: 1px solid var(--gray-200);
}

.collapse-btn {
    width: 100%;
    padding: 15px 20px;
    background: var(--gray-50);
    border: none;
    border-bottom: 1px solid var(--gray-200);
    font-size: 1rem;
    font-weight: 600;
    color: var(--gray-700);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: background 0.2s;
}

.collapse-btn:hover {
    background: var(--gray-100);
}

.collapse-btn span:first-child {
    transition: transform 0.2s;
}

.settings-content {
    max-height: 1000px;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.settings-content.collapsed {
    max-height: 0;
}

.settings-section {
    padding: 20px;
}

.settings-section.advanced {
    background: var(--gray-50);
    padding: 0;
}

.settings-section h3 {
    font-size: 1.1rem;
    margin-bottom: 15px;
    color: var(--gray-700);
}

/* Form Controls */
.form-row {
    margin-bottom: 15px;
}

.form-row label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--gray-700);
}

.checkbox-row {
    margin-bottom: 0 !important;
}

.checkbox-row input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
    accent-color: var(--gray-600);
}

.form-row-compact {
    display: grid;
    grid-template-columns: 1fr 180px;
    gap: 10px;
    align-items: center;
    padding: 8px 20px;
    border-bottom: 1px solid var(--gray-200);
}

.form-row-compact:last-child {
    border-bottom: none;
}

.form-row-compact label {
    font-size: 0.85rem;
    color: var(--gray-600);
    margin: 0;
    display: flex;
    align-items: center;
    gap: 6px;
}

/* Slider Controls */
.slider-container {
    display: flex;
    align-items: center;
    gap: 10px;
}

.slider {
    flex: 1;
    height: 6px;
    border-radius: 3px;
    background: var(--gray-200);
    outline: none;
    -webkit-appearance: none;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    transition: all 0.2s;
}

.slider::-webkit-slider-thumb:hover {
    background: var(--primary-dark);
    transform: scale(1.1);
}

.slider::-moz-range-thumb {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    border: none;
    transition: all 0.2s;
}

.slider::-moz-range-thumb:hover {
    background: var(--primary-dark);
    transform: scale(1.1);
}

.slider:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.slider-value {
    font-size: 0.85rem;
    color: var(--gray-700);
    font-weight: 600;
    min-width: 45px;
    text-align: right;
    flex-shrink: 0;
}

/* Info Icon Tooltip */
.info-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 16px;
    height: 16px;
    font-size: 0.75rem;
    color: var(--info-color);
    cursor: help;
    position: relative;
    user-select: none;
}

/* Desktop: Hover tooltip */
@media (min-width: 769px) {
    .info-icon:hover::after {
        content: attr(title);
        position: absolute;
        left: 50%;
        bottom: 100%;
        transform: translateX(-50%);
        margin-bottom: 8px;
        padding: 8px 12px;
        background: var(--gray-900);
        color: white;
        font-size: 0.75rem;
        border-radius: 6px;
        white-space: normal;
        width: 220px;
        z-index: 1000;
        box-shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
        pointer-events: none;
        line-height: 1.4;
    }

    .info-icon:hover::before {
        content: '';
        position: absolute;
        left: 50%;
        bottom: 100%;
        transform: translateX(-50%);
        margin-bottom: 2px;
        border: 6px solid transparent;
        border-top-color: var(--gray-900);
        z-index: 1000;
        pointer-events: none;
    }
}

/* Mobile: Tap to show tooltip */
@media (max-width: 768px) {
    .info-icon.active::after {
        content: attr(title);
        position: fixed;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        padding: 16px 20px;
        background: var(--gray-900);
        color: white;
        font-size: 0.85rem;
        border-radius: 8px;
        white-space: normal;
        width: 80%;
        max-width: 300px;
        z-index: 10000;
        box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
        line-height: 1.5;
    }

    .info-icon.active::before {
        content: '';
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.3);
        z-index: 9999;
    }
}

.form-control,
.form-control-sm {
    width: 100%;
    padding: 10px 12px;
    border: 2px solid var(--gray-200);
    border-radius: 8px;
    font-size: 0.95rem;
    font-family: inherit;
    transition: all 0.2s;
}

.form-control-sm {
    padding: 6px 10px;
    font-size: 0.85rem;
}

.form-control:focus,
.form-control-sm:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-control:disabled,
.form-control-sm:disabled {
    background: var(--gray-100);
    color: var(--gray-400);
    cursor: not-allowed;
}

textarea.form-control {
    resize: vertical;
    min-height: 60px;
}

.btn-icon {
    padding: 4px 10px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-icon:hover:not(:disabled) {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

.btn-icon:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Phone Test Section */
.phone-test-section {
    background: white;
    padding: 20px;
    border-bottom: 1px solid var(--gray-200);
}

.phone-test-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 8px;
}

.phone-test-header i {
    color: var(--primary-color);
    font-size: 1.2rem;
}

.phone-test-header h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--gray-800);
    margin: 0;
}

.phone-test-description {
    color: var(--gray-600);
    font-size: 0.85rem;
    margin-bottom: 15px;
}

.phone-input-group {
    display: flex;
    gap: 10px;
}

.phone-input {
    flex: 1;
    padding: 12px 15px;
    border: 2px solid var(--gray-300);
    border-radius: 8px;
    font-size: 0.95rem;
    transition: border-color 0.2s;
}

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

.phone-input::placeholder {
    color: var(--gray-400);
}

.btn-phone {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 8px;
    white-space: nowrap;
}

.btn-phone:hover:not(:disabled) {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

.btn-phone:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.phone-status {
    margin-top: 12px;
    padding: 10px 15px;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 500;
}

.phone-status-info {
    background: #e3f2fd;
    color: #1565c0;
    border-left: 3px solid #1976d2;
}

.phone-status-success {
    background: #e8f5e9;
    color: #2e7d32;
    border-left: 3px solid #4caf50;
}

.phone-status-error {
    background: #ffebee;
    color: #c62828;
    border-left: 3px solid #f44336;
}

/* Conversation Area */
.conversation-area {
    flex: 1;
    min-height: 200px;
}

.conversation {
    height: 100%;
    padding: 20px;
    background: var(--gray-50);
    overflow-y: auto;
    scroll-behavior: smooth; /* Smooth auto-scroll animation */
}

.message-welcome {
    text-align: center;
    padding: 60px 20px;
    color: var(--gray-400);
}

.welcome-icon {
    font-size: 4rem;
    margin-bottom: 20px;
    opacity: 0.5;
}

.message-welcome h3 {
    font-size: 1.3rem;
    margin-bottom: 10px;
    color: var(--gray-600);
}

.message-welcome p {
    font-size: 0.9rem;
}

.message {
    margin-bottom: 12px;
    padding: 12px 16px;
    border-radius: 12px;
    animation: slideIn 0.3s ease;
    max-width: 85%;
}

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

.message strong {
    display: block;
    font-size: 0.75rem;
    text-transform: uppercase;
    margin-bottom: 5px;
    opacity: 0.7;
}

.message.user-message {
    background: #dbeafe;
    border-left: 3px solid var(--info-color);
    margin-right: auto;
}

.message.user-message.interim {
    background: #fef3c7;
    border-left: 3px solid var(--warning-color);
    opacity: 0.7;
    font-style: italic;
}

.message.assistant-message {
    background: #f3e8ff;
    border-left: 3px solid #9c27b0;
    margin-left: auto;
}

.message.user-message {
    background: #e3f2fd;
    border-left: 3px solid #2196f3;
    margin-right: auto;
    margin-left: 0;
}

.message.system-message {
    background: var(--gray-100);
    border: none;
    text-align: center;
    font-size: 0.85rem;
    color: var(--gray-600);
    font-style: italic;
    max-width: 100%;
}

/* Bottom Controls */
.bottom-controls {
    flex-shrink: 0;
    background: white;
    border-top: 1px solid var(--gray-200);
    box-shadow: 0 -4px 6px -1px rgba(0, 0, 0, 0.05);
}

.status-bar {
    padding: 12px 20px;
    background: var(--gray-50);
    border-bottom: 1px solid var(--gray-200);
}

.status-indicator {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    font-size: 0.9rem;
    font-weight: 500;
}

.status-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--gray-300);
    animation: pulse 2s infinite;
}

.status-indicator.connected .status-dot {
    background: var(--success-color);
}

.status-indicator.listening .status-dot {
    background: var(--info-color);
    animation: pulse 0.5s infinite;
}

.status-indicator.speaking .status-dot {
    background: var(--warning-color);
    animation: pulse 1s infinite;
}

.status-indicator.error .status-dot {
    background: var(--danger-color);
}

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

.control-buttons {
    padding: 15px;
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 10px;
}

.btn {
    padding: 14px 20px;
    border: none;
    border-radius: 10px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
}

.btn .btn-icon {
    font-size: 1.5rem;
    background: none;
    padding: 0;
}

.btn .btn-text {
    font-size: 0.85rem;
}

.btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.btn:active:not(:disabled) {
    transform: translateY(0);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
}

.btn-mute {
    background: var(--gray-600);
    color: white;
}

.btn-mute.muted {
    background: var(--danger-color);
}

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

/* Log Panel */
.log-panel {
    flex-shrink: 0;
    border-top: 1px solid var(--gray-200);
    background: white;
}

.log-toggle {
    width: 100%;
    padding: 10px 20px;
    background: var(--gray-50);
    border: none;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--gray-600);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: background 0.2s;
}

.log-toggle:hover {
    background: var(--gray-100);
}

.log-content {
    max-height: 200px;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.log-content.collapsed {
    max-height: 0;
}

.log-header {
    padding: 10px 20px;
    display: flex;
    justify-content: flex-end;
    border-bottom: 1px solid var(--gray-200);
}

.btn-small {
    padding: 6px 12px;
    font-size: 0.8rem;
    background: var(--gray-600);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: background 0.2s;
}

.btn-small:hover {
    background: var(--gray-700);
}

.log-container {
    height: 150px;
    overflow-y: auto;
    font-family: 'Courier New', monospace;
    font-size: 0.75rem;
    background: var(--gray-900);
    color: var(--gray-50);
    padding: 10px 15px;
}

.log-entry {
    margin-bottom: 4px;
    padding: 2px 0;
}

.log-entry.log-info { color: #60a5fa; }
.log-entry.log-success { color: #34d399; }
.log-entry.log-error { color: #f87171; }
.log-entry.log-warning { color: #fbbf24; }

/* Scrollbar */
.content-area::-webkit-scrollbar,
.conversation::-webkit-scrollbar,
.log-container::-webkit-scrollbar {
    width: 6px;
}

.content-area::-webkit-scrollbar-track,
.conversation::-webkit-scrollbar-track {
    background: var(--gray-100);
}

.log-container::-webkit-scrollbar-track {
    background: var(--gray-700);
}

.content-area::-webkit-scrollbar-thumb,
.conversation::-webkit-scrollbar-thumb {
    background: var(--gray-300);
    border-radius: 3px;
}

.log-container::-webkit-scrollbar-thumb {
    background: var(--gray-600);
    border-radius: 3px;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    body {
        padding: 0;
        align-items: stretch;
    }

    .container {
        max-width: 100%;
        border-radius: 0;
    }

    .app-header h1 {
        font-size: 1.5rem;
    }

    .control-buttons {
        gap: 8px;
    }

    .btn {
        padding: 12px 10px;
    }

    .btn .btn-text {
        font-size: 0.75rem;
    }
}