/* Root Variables */
:root {
    --bg-primary: #F9FAFB;
    --bg-secondary: #FFFFFF;
    --bg-tertiary: #E5E7EB;
    --text-primary: #111827;
    --text-secondary: #6B7280;
    --border-color: #E5E7EB;
    --accent-color: #2563EB;
    --accent-hover: #1D4ED8;
    --success-color: #16A34A;
    --error-color: #DC2626;
    --shadow: rgba(0, 0, 0, 0.1);
}

.dark {
    --bg-primary: #111827;
    --bg-secondary: #1F2937;
    --bg-tertiary: #374151;
    --text-primary: #F9FAFB;
    --text-secondary: #9CA3AF;
    --border-color: #374151;
    --accent-color: #2563EB;
    --accent-hover: #1D4ED8;
    --success-color: #16A34A;
    --error-color: #DC2626;
    --shadow: rgba(0, 0, 0, 0.3);
}

* {
    box-sizing: border-box;
}

html {
    height: 100%;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    margin: 0;
    padding: 0;
    min-height: 100vh;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    transition: background-color 200ms ease, color 200ms ease;
}

.d-none {
    display: none !important;
}

/* App Container */
.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
}

/* Header */
.app-header {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 0 1.5rem;
    height: 64px;
    display: flex;
    align-items: center;
    transition: background-color 200ms ease, border-color 200ms ease;
}

.header-content {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo {
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.app-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 0;
    color: var(--text-primary);
}

.iteration-badge {
    background-color: var(--accent-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.875rem;
    font-weight: 600;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-icon {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 200ms ease;
}

.btn-icon:hover {
    background-color: var(--bg-tertiary);
}

/* Error Banner */
.error-banner {
    background-color: var(--error-color);
    color: white;
    padding: 0.75rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.error-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    max-width: 1200px;
}

.btn-dismiss {
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
}

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

/* Left Panel (30%) */
.left-panel {
    width: 30%;
    min-width: 300px;
    border-right: 1px solid var(--border-color);
    background-color: var(--bg-secondary);
    display: flex;
    flex-direction: column;
    transition: background-color 200ms ease, border-color 200ms ease;
}

.panel-content {
    flex: 1;
    padding: 1.5rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
}

.panel-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin: 0 0 0.5rem 0;
    color: var(--text-primary);
}

.panel-subtitle {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin: 0 0 1.5rem 0;
}

.prompt-textarea {
    flex: 1;
    min-height: 200px;
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.875rem;
    line-height: 1.6;
    resize: none;
    transition: all 200ms ease;
    margin-bottom: 0.75rem;
}

.prompt-textarea:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.prompt-textarea:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.helper-text {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin: 0 0 1rem 0;
}

.btn-primary {
    width: 100%;
    padding: 0.75rem 1rem;
    background-color: var(--accent-color);
    color: white;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.875rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: all 200ms ease;
    box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
}

.btn-primary:hover:not(:disabled) {
    background-color: var(--accent-hover);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

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

.spinner {
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

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

/* Right Panel (70%) */
.right-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    background-color: var(--bg-secondary);
    transition: background-color 200ms ease;
    min-width: 0;
    overflow: hidden;
}

.panel-header {
    padding: 0.75rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: border-color 200ms ease;
}

.tabs {
    display: flex;
    gap: 0.5rem;
}

.tab {
    padding: 0.5rem 1rem;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    border-radius: 6px;
    transition: all 200ms ease;
}

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

.tab.active {
    color: var(--accent-color);
    background-color: rgba(37, 99, 235, 0.1);
}

.panel-actions {
    display: flex;
    gap: 0.5rem;
}

.btn-action {
    padding: 0.5rem 0.75rem;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    transition: all 200ms ease;
}

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

.btn-action svg {
    flex-shrink: 0;
}

/* Tab Content */
.tab-content {
    flex: 1;
    display: none;
    flex-direction: column;
    overflow: hidden;
    min-width: 0;
    width: 100%;
}

.tab-content.active {
    display: flex;
}

.preview-container {
    flex: 1;
    position: relative;
    margin: 1.5rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--bg-primary);
    overflow: hidden;
    transition: border-color 200ms ease;
    box-sizing: border-box;
    min-width: 0;
}

.preview-frame {
    width: 100%;
    height: 100%;
    border: none;
    background-color: white;
}

.dark .preview-frame {
    background-color: #1a1a1a;
}

.empty-state {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
}

.empty-state svg {
    opacity: 0.5;
    margin-bottom: 1rem;
}

.empty-state h3 {
    margin: 0;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-primary);
}

.loading-state {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
}

.spinner-large {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-bottom: 1rem;
}

.loading-state p {
    margin: 0;
    font-size: 0.875rem;
}

.status-indicator {
    padding: 0.75rem 1.5rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

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

.status-dot.generating {
    background-color: var(--accent-color);
}

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

/* Code Container */
.code-container {
    flex: 1;
    position: relative;
    margin: 1.5rem;
    overflow: auto;
    box-sizing: border-box;
    min-width: 0;
}

.code-display {
    margin: 0;
    padding: 1rem;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow-x: auto;
    box-sizing: border-box;
    width: 100%;
}

.code-display code {
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.875rem;
    line-height: 1.6;
    color: var(--text-primary);
    white-space: pre;
    display: block;
    min-width: 0;
}

/* Footer */
.app-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border-color);
    background-color: var(--bg-secondary);
    text-align: center;
    font-size: 0.875rem;
    color: var(--text-secondary);
    transition: background-color 200ms ease, border-color 200ms ease;
}

/* Responsive */
@media (max-width: 768px) {
    .main-content {
        flex-direction: column;
    }
    
    .left-panel {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }
    
    .prompt-textarea {
        min-height: 150px;
    }
}

/* Scrollbar */
.panel-content::-webkit-scrollbar,
.code-container::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

.panel-content::-webkit-scrollbar-track,
.code-container::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

.panel-content::-webkit-scrollbar-thumb,
.code-container::-webkit-scrollbar-thumb {
    background: var(--bg-tertiary);
    border-radius: 4px;
}

.panel-content::-webkit-scrollbar-thumb:hover,
.code-container::-webkit-scrollbar-thumb:hover {
    background: var(--border-color);
}