:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-tertiary: #1a1a25;
    --bg-hover: #252533;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-tertiary: #64748b;
    --accent-cyan: #00d4ff;
    --accent-purple: #7c3aed;
    --accent-gradient: linear-gradient(135deg, #00d4ff 0%, #7c3aed 100%);
    --border-color: rgba(255, 255, 255, 0.1);
    --shadow-glow: 0 0 20px rgba(0, 212, 255, 0.3);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-display: 'Space Grotesk', sans-serif;
}

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

body {
    font-family: var(--font-primary);
    background: var(--bg-primary);
    color: var(--text-primary);
    height: 100vh;
    overflow: hidden;
}

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

/* Sidebar */
.sidebar {
    width: 280px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.logo-icon {
    width: 32px;
    height: 32px;
    color: var(--accent-cyan);
}

.logo-text {
    font-family: var(--font-display);
    font-size: 20px;
    font-weight: 600;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.new-chat-btn {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: all 0.2s;
}

.new-chat-btn:hover {
    background: var(--bg-hover);
    border-color: var(--accent-cyan);
}

.sidebar-content {
    flex: 1;
    overflow-y: auto;
    padding: 16px;
}

.section-title {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-tertiary);
    margin-bottom: 12px;
}

.chat-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.chat-item {
    padding: 12px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: all 0.15s;
    border: 1px solid transparent;
}

.chat-item:hover {
    background: var(--bg-tertiary);
}

.chat-item.active {
    background: var(--bg-hover);
    border-color: var(--accent-cyan);
}

.chat-item-icon {
    width: 16px;
    height: 16px;
    color: var(--text-tertiary);
    flex-shrink: 0;
}

.chat-item-text {
    flex: 1;
    font-size: 13px;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sidebar-footer {
    padding: 16px;
    border-top: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 10px;
}

.user-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--accent-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 600;
    color: white;
}

.user-details {
    display: flex;
    flex-direction: column;
}

.user-name {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
}

.user-status {
    font-size: 11px;
    color: var(--text-tertiary);
}

.settings-btn {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.settings-btn:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.main-header {
    height: 64px;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-secondary);
}

.model-selector {
    display: flex;
    align-items: center;
    gap: 12px;
}

.model-selector label {
    font-size: 13px;
    color: var(--text-secondary);
}

.model-select {
    padding: 8px 12px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 13px;
    cursor: pointer;
    outline: none;
}

.model-select:focus {
    border-color: var(--accent-cyan);
}

.header-actions {
    display: flex;
    gap: 8px;
}

.action-btn {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.action-btn:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

/* Chat Container */
.chat-container {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
}

.welcome-screen {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100%;
}

.welcome-content {
    text-align: center;
    max-width: 700px;
}

.welcome-icon {
    margin-bottom: 24px;
}

.welcome-title {
    font-family: var(--font-display);
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 16px;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.welcome-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.6;
}

.quick-prompts {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
    margin-bottom: 48px;
}

.quick-prompt {
    padding: 12px 20px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s;
}

.quick-prompt:hover {
    background: var(--bg-hover);
    border-color: var(--accent-cyan);
    color: var(--text-primary);
}

.feature-cards {
    display: flex;
    gap: 24px;
    justify-content: center;
}

.feature-card {
    padding: 24px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    text-align: center;
    min-width: 140px;
}

.feature-icon {
    font-size: 28px;
    margin-bottom: 12px;
}

.feature-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.feature-desc {
    font-size: 12px;
    color: var(--text-tertiary);
}

/* Messages */
.messages {
    display: flex;
    flex-direction: column;
    gap: 24px;
    max-width: 900px;
    margin: 0 auto;
}

.message {
    display: flex;
    gap: 16px;
}

.message-user {
    justify-content: flex-end;
}

.message-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 14px;
}

.message-user .message-avatar {
    background: var(--accent-gradient);
    color: white;
}

.message-ai .message-avatar {
    background: var(--bg-tertiary);
    color: var(--accent-cyan);
}

.message-content {
    max-width: 80%;
}

.message-bubble {
    padding: 16px 20px;
    border-radius: var(--radius-md);
    font-size: 15px;
    line-height: 1.6;
}

.message-user .message-bubble {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
}

.message-ai .message-bubble {
    background: transparent;
    padding: 0;
}

/* Video Container */
.video-container {
    width: 100%;
    max-width: 640px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.video-wrapper {
    position: relative;
    aspect-ratio: 16/9;
    background: var(--bg-tertiary);
}

.video-wrapper video {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.video-placeholder {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
}

.spinner {
    width: 48px;
    height: 48px;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent-cyan);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 16px;
}

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

.video-info {
    padding: 16px;
    border-top: 1px solid var(--border-color);
}

.video-prompt {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 12px;
    line-height: 1.5;
}

.video-actions {
    display: flex;
    gap: 8px;
}

.video-btn {
    padding: 8px 16px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 13px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all 0.2s;
}

.video-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.video-btn.primary {
    background: var(--accent-gradient);
    border-color: transparent;
    color: white;
}

.video-btn.primary:hover {
    box-shadow: var(--shadow-glow);
}

/* Input Container */
.input-container {
    padding: 24px;
    border-top: 1px solid var(--border-color);
    background: var(--bg-secondary);
}

.input-wrapper {
    max-width: 900px;
    margin: 0 auto;
    position: relative;
}

.prompt-input {
    width: 100%;
    padding: 16px 120px 16px 20px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    color: var(--text-primary);
    font-size: 15px;
    font-family: inherit;
    resize: none;
    outline: none;
    min-height: 56px;
    max-height: 200px;
    transition: all 0.2s;
}

.prompt-input:focus {
    border-color: var(--accent-cyan);
    box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.1);
}

.prompt-input::placeholder {
    color: var(--text-tertiary);
}

.input-actions {
    position: absolute;
    right: 12px;
    bottom: 12px;
    display: flex;
    gap: 8px;
}

.image-upload-btn, .send-btn {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
}

.image-upload-btn {
    background: var(--bg-hover);
    color: var(--text-secondary);
}

.image-upload-btn:hover {
    color: var(--text-primary);
}

.image-upload-btn.active {
    background: var(--accent-cyan);
    color: var(--bg-primary);
}

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

.send-btn:hover {
    box-shadow: var(--shadow-glow);
    transform: translateY(-1px);
}

.send-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.input-footer {
    max-width: 900px;
    margin: 12px auto 0;
    text-align: center;
}

.disclaimer {
    font-size: 12px;
    color: var(--text-tertiary);
}

/* Modal */
.modal {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.8);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    backdrop-filter: blur(4px);
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 500px;
    margin: 20px;
    animation: modalIn 0.2s ease;
}

@keyframes modalIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.modal-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-header h2 {
    font-family: var(--font-display);
    font-size: 18px;
    font-weight: 600;
}

.close-btn {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.close-btn:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.modal-body {
    padding: 20px;
}

.setting-item {
    margin-bottom: 20px;
}

.setting-item label {
    display: block;
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.setting-item select {
    width: 100%;
    padding: 12px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 14px;
}

.sign-in-btn {
    width: 100%;
    padding: 14px;
    background: var(--accent-gradient);
    border: none;
    border-radius: var(--radius-md);
    color: white;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.sign-in-btn:hover {
    box-shadow: var(--shadow-glow);
}

/* Image Upload Modal */
.image-upload-area {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-md);
    padding: 32px;
    margin-bottom: 16px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
}

.image-upload-area:hover {
    border-color: var(--accent-cyan);
    background: rgba(0, 212, 255, 0.05);
}

.upload-placeholder {
    color: var(--text-secondary);
}

.upload-placeholder svg {
    margin-bottom: 12px;
    color: var(--text-tertiary);
}

.upload-placeholder p {
    font-size: 14px;
}

.image-preview {
    position: relative;
    display: inline-block;
}

.image-preview img {
    max-width: 100%;
    max-height: 200px;
    border-radius: var(--radius-sm);
}

.remove-image {
    position: absolute;
    top: -8px;
    right: -8px;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
}

.remove-image:hover {
    background: #ef4444;
    color: white;
    border-color: #ef4444;
}

.generate-btn {
    width: 100%;
    padding: 14px;
    background: var(--accent-gradient);
    border: none;
    border-radius: var(--radius-md);
    color: white;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.generate-btn:hover {
    box-shadow: var(--shadow-glow);
}

/* Error Message */
.error-message {
    padding: 16px;
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    border-radius: var(--radius-md);
    color: #ef4444;
    font-size: 14px;
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: -280px;
        height: 100vh;
        z-index: 100;
        transition: left 0.3s;
    }

    .sidebar.open {
        left: 0;
    }

    .welcome-title {
        font-size: 32px;
    }

    .feature-cards {
        flex-direction: column;
        align-items: center;
    }

    .quick-prompts {
        flex-direction: column;
        align-items: center;
    }

    .quick-prompt {
        width: 100%;
        max-width: 300px;
    }

    .message-content {
        max-width: 90%;
    }
}