/* ===== CSS Variables & Root Styles ===== */
:root {
    /* Colors - Clean White Theme */
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f8f9fa;
    --color-bg-tertiary: #f1f3f5;
    
    --color-primary: #15bf9e;
    --color-primary-light: #1dd3ae;
    --color-primary-dark: #12a88a;
    
    --color-text-primary: #1a1a1a;
    --color-text-secondary: #4a5568;
    --color-text-muted: #718096;
    
    --color-border: #e2e8f0;
    --color-border-hover: #cbd5e0;
    
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* ===== Header ===== */
.header {
    background: var(--color-bg-primary);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-md) var(--spacing-xl);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-lg);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.25rem;
    font-weight: 700;
    text-decoration: none;
    color: var(--color-text-primary);
}

.logo-icon {
    font-size: 1.5rem;
}

.logo-text {
    color: var(--color-text-primary);
}

.nav {
    display: flex;
    gap: var(--spacing-lg);
}

.nav-link {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: color var(--transition-fast);
}

.nav-link:hover {
    color: var(--color-primary);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 0.95rem;
    font-weight: 500;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    white-space: nowrap;
}

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

.btn-primary:hover {
    background: var(--color-primary-dark);
}

.btn-outline {
    background: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

.btn-outline:hover {
    background: var(--color-primary);
    color: white;
}

.btn-ghost {
    background: transparent;
    color: var(--color-text-secondary);
}

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

.btn-small {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: 0.85rem;
}

.btn-large {
    padding: var(--spacing-md) var(--spacing-2xl);
    font-size: 1.1rem;
}

/* ===== Hero Section ===== */
.hero {
    background: var(--color-bg-primary);
    padding: var(--spacing-3xl) var(--spacing-xl);
    text-align: center;
}

.hero-content {
    max-width: 700px;
    margin: 0 auto;
}

.hero h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
}

.hero-tagline {
    font-size: 1.5rem;
    color: var(--color-primary);
    font-weight: 500;
    margin-bottom: var(--spacing-lg);
}

.hero-description {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-2xl);
    line-height: 1.8;
}

/* ===== Features Section ===== */
.features {
    background: var(--color-bg-secondary);
    padding: var(--spacing-3xl) var(--spacing-xl);
}

.features-grid {
    max-width: 1100px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
}

.feature-card {
    background: var(--color-bg-primary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
}

.feature-card p {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* ===== Pricing Section ===== */
.pricing {
    padding: var(--spacing-3xl) var(--spacing-xl);
    text-align: center;
}

.pricing h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-2xl);
}

.pricing-grid {
    max-width: 1000px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.pricing-card {
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    position: relative;
    transition: all var(--transition-normal);
}

.pricing-card:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
}

.pricing-card.featured {
    border: 2px solid var(--color-primary);
    transform: scale(1.05);
}

.featured-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-primary);
    color: white;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-weight: 600;
}

.pricing-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.pricing-desc {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-lg);
}

.pricing-features {
    text-align: left;
    margin-bottom: var(--spacing-xl);
}

.pricing-feature {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) 0;
    font-size: 0.95rem;
    color: var(--color-text-secondary);
}

.pricing-feature .check {
    color: var(--color-primary);
    font-weight: bold;
}

.pricing-price {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-lg);
}

.pricing-card .btn {
    width: 100%;
}

/* ===== Analyzer Section ===== */
.analyzer-section {
    background: var(--color-bg-secondary);
    padding: var(--spacing-3xl) var(--spacing-xl);
}

.analyzer-container {
    max-width: 1000px;
    margin: 0 auto;
}

.analyzer-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.analyzer-header h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.analyzer-header p {
    color: var(--color-text-secondary);
}

.usage-bar {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(21, 191, 158, 0.1);
    border: 1px solid rgba(21, 191, 158, 0.2);
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-lg);
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}

.usage-icon {
    color: var(--color-warning);
}

.editor-wrapper {
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.editor-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-bg-tertiary);
    border-bottom: 1px solid var(--color-border);
}

.toolbar-title {
    font-weight: 500;
    color: var(--color-text-secondary);
    font-size: 0.9rem;
}

.toolbar-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.sql-editor {
    height: 280px;
    width: 100%;
}

.analyze-actions {
    margin-top: var(--spacing-xl);
    text-align: center;
}

.btn-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.btn-loading {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.spinner {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* ===== Results Section ===== */
.results-section {
    margin-top: var(--spacing-2xl);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
    animation: fadeIn 0.4s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.result-panel {
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
    background: var(--color-bg-tertiary);
}

.panel-header h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text-primary);
}

.panel-actions {
    display: flex;
    gap: var(--spacing-xs);
}

.panel-content {
    padding: var(--spacing-lg);
}

.summary-content {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    line-height: 1.8;
}

.summary-content h1, .summary-content h2, .summary-content h3 {
    color: var(--color-text-primary);
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

.summary-content code {
    background: var(--color-bg-tertiary);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    font-family: 'Fira Code', monospace;
    font-size: 0.85em;
}

.summary-content pre {
    background: var(--color-bg-tertiary);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    overflow-x: auto;
}

.lineage-content {
    padding: 0;
    height: 600px;
}

.lineage-iframe {
    width: 100%;
    height: 100%;
    border: none;
    background: white;
}

/* ===== Error Banner ===== */
.error-banner {
    position: fixed;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-error);
    color: white;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    box-shadow: var(--shadow-lg);
    z-index: 1000;
}

.btn-close {
    background: transparent;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0;
    line-height: 1;
}

/* ===== Loading Overlay ===== */
.loading-overlay {
    position: fixed;
    inset: 0;
    background: rgba(255, 255, 255, 0.95);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.loading-content {
    text-align: center;
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--spacing-lg);
}

.loading-text {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
}

.loading-subtext {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

/* ===== Footer ===== */
.footer {
    background: var(--color-bg-primary);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-xl);
    text-align: center;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
}

.footer-links a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color var(--transition-fast);
}

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

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

/* ===== Modal ===== */
.modal {
    position: fixed;
    inset: 0;
    background: var(--color-bg-primary);
    z-index: 2000;
    display: flex;
    flex-direction: column;
}

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

.modal-header h3 {
    font-size: 1.25rem;
}

.modal-header .btn-close {
    color: var(--color-text-secondary);
    font-size: 2rem;
}

.modal-content {
    flex: 1;
    overflow: hidden;
}

.lineage-iframe-fullscreen {
    width: 100%;
    height: 100%;
    border: none;
    background: white;
}

/* ===== Responsive Design ===== */
@media (max-width: 992px) {
    .features-grid,
    .pricing-grid {
        grid-template-columns: 1fr;
        max-width: 400px;
    }
    
    .pricing-card.featured {
        transform: none;
    }
    
    .hero h1 {
        font-size: 2.25rem;
    }
    
    .hero-tagline {
        font-size: 1.25rem;
    }
}

@media (max-width: 768px) {
    .header-content {
        flex-wrap: wrap;
    }
    
    .nav {
        display: none;
    }
    
    .hero {
        padding: var(--spacing-2xl) var(--spacing-md);
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .sql-editor {
        height: 200px;
    }
    
    .lineage-content {
        height: 400px;
    }
    
    .features,
    .pricing,
    .analyzer-section {
        padding: var(--spacing-2xl) var(--spacing-md);
    }
}