/* Core Design System & Tokens */
:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;
    --border-color: #e5e7eb;
    
    --text-primary: #111827;
    --text-secondary: #4b5563;
    --text-tertiary: #9ca3af;
    
    --accent-blue: #3b82f6;
    --accent-blue-hover: #2563eb;
    
    --font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.04), 0 4px 6px -2px rgba(0, 0, 0, 0.02);
    --shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.03);
}

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

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4 {
    font-weight: 700;
    letter-spacing: -0.025em;
    line-height: 1.25;
}

a {
    color: inherit;
    text-decoration: none;
}

/* Button UI Components */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.875rem;
    padding: 0.625rem 1.25rem;
    border-radius: 6px;
    border: 1px solid transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: center;
}

.btn-sm {
    font-size: 0.8125rem;
    padding: 0.4375rem 0.875rem;
}

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

.btn-primary:hover {
    background-color: #2a3342;
    transform: translateY(-1px);
}

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

.btn-secondary:hover {
    background-color: var(--border-color);
}

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

.btn-outline:hover {
    background-color: var(--bg-secondary);
}

.w-full {
    width: 100%;
}

/* Badge component */
.badge {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
    margin-bottom: 1rem;
    border: 1px solid var(--border-color);
}

/* Navigation Header */
.main-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    transition: all var(--transition-normal);
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo-wrapper {
    display: flex;
    align-items: center;
    font-weight: 700;
    font-size: 1.125rem;
    letter-spacing: -0.03em;
}

.logo-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: var(--text-primary);
    margin-right: 8px;
    display: inline-block;
}

.logo-sub {
    font-weight: 400;
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-left: 2px;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-item {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

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

/* Hero Section */
.hero-section {
    padding: 6rem 1.5rem;
    background-color: var(--bg-primary);
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}

.hero-container {
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: 3.25rem;
    line-height: 1.15;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    background: linear-gradient(135deg, var(--text-primary) 30%, #4b5563 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
    line-height: 1.6;
}

.hero-cta-wrapper {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 4rem;
}

.hero-showcase {
    max-width: 900px;
    margin: 0 auto;
    border-radius: 12px;
    padding: 8px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
}

.showcase-frame {
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    background-color: var(--bg-primary);
    line-height: 0;
}

.showcase-img {
    width: 100%;
    height: auto;
    display: block;
}

/* Common Section Layouts */
.section-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 6rem 1.5rem;
}

.section-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto 4rem auto;
}

.section-header h2 {
    font-size: 2.25rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.section-description {
    font-size: 1.0625rem;
    color: var(--text-secondary);
}

/* Features Section with Tabs */
.features-section {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

.features-tabs {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 3rem;
    background-color: var(--bg-tertiary);
    padding: 0.375rem;
    border-radius: 8px;
    width: max-content;
    margin-left: auto;
    margin-right: auto;
    border: 1px solid var(--border-color);
}

.tab-button {
    background: transparent;
    border: none;
    font-family: var(--font-family);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    padding: 0.5rem 1.25rem;
    border-radius: 6px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.tab-button:hover {
    color: var(--text-primary);
}

.tab-button.active {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    box-shadow: var(--shadow-sm);
}

/* Tab Panel Styles */
.tab-panel {
    display: none;
    opacity: 0;
    transform: translateY(8px);
    transition: all var(--transition-normal);
}

.tab-panel.active {
    display: block;
    opacity: 1;
    transform: translateY(0);
}

.tab-panel-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 4rem;
    align-items: center;
    background-color: var(--bg-primary);
    padding: 3rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
}

.panel-info h3 {
    font-size: 1.75rem;
    margin-bottom: 1rem;
}

.panel-info p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.feature-bullets {
    list-style: none;
}

.feature-bullets li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 0.75rem;
    font-size: 0.9375rem;
    color: var(--text-secondary);
}

.feature-bullets li::before {
    content: "✓";
    position: absolute;
    left: 0;
    top: 0;
    color: var(--text-primary);
    font-weight: bold;
}

/* Custom Visual Previews in Tabs */
.visual-placeholder {
    height: 280px;
    border-radius: 8px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
    box-shadow: var(--shadow-inner);
}

/* DNA Helix Animation (WebGL Preview) */
.preview-dna-helix {
    display: flex;
    align-items: center;
    justify-content: space-around;
    width: 60%;
    height: 100%;
    transform: rotate(20deg);
}

.preview-dna-helix .node {
    width: 8px;
    height: 8px;
    background-color: var(--text-primary);
    border-radius: 50%;
    position: relative;
    animation: helixSpin 2s ease-in-out infinite alternate;
    animation-delay: calc(var(--i) * 0.15s);
}

.preview-dna-helix .node::after {
    content: '';
    position: absolute;
    width: 2px;
    height: 40px;
    background-color: var(--border-color);
    left: 3px;
    top: 4px;
    z-index: -1;
}

@keyframes helixSpin {
    0% { transform: translateY(-30px) scale(0.8); background-color: var(--text-secondary); }
    100% { transform: translateY(30px) scale(1.2); background-color: var(--accent-blue); }
}

/* Compiler Code Lines Preview */
.preview-compiler-lines {
    padding: 2rem;
    width: 100%;
    display: flex;
    flex-column: column;
    flex-direction: column;
    gap: 0.75rem;
}

.preview-compiler-lines .line {
    height: 8px;
    background-color: var(--border-color);
    border-radius: 4px;
}

.preview-compiler-lines .line.indent {
    margin-left: 20px;
}

.preview-compiler-lines .line.compile-success {
    background-color: #10b981;
    position: relative;
    animation: compilePulse 2s infinite alternate;
}

@keyframes compilePulse {
    0% { opacity: 0.4; }
    100% { opacity: 1; }
}

/* Data Server Query Preview */
.preview-server-query {
    width: 80%;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.query-bubble {
    background-color: var(--text-primary);
    color: var(--bg-primary);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    align-self: flex-start;
    font-size: 0.8125rem;
    font-weight: 600;
}

.response-card {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    padding: 1rem;
    border-radius: 6px;
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.card-line {
    background-color: var(--border-color);
    border-radius: 3px;
}

/* Compliance Section */
.compliance-section {
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
}

.compliance-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 6rem;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 6rem 1.5rem;
}

.compliance-info h2 {
    font-size: 2.25rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.compliance-info p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    font-size: 1.0625rem;
}

.compliance-sources {
    display: grid;
    gap: 1.25rem;
}

.source-item {
    display: flex;
    flex-direction: column;
}

.source-item strong {
    font-size: 0.9375rem;
    color: var(--text-primary);
}

.source-item span {
    font-size: 0.8125rem;
    color: var(--text-secondary);
}

.compliance-visual {
    display: flex;
    justify-content: center;
}

.compliance-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2.5rem;
    max-width: 380px;
    text-align: center;
    box-shadow: var(--shadow-md);
}

.compliance-card .check-icon {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background-color: #ecfdf5;
    color: #059669;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: bold;
    margin: 0 auto 1.5rem auto;
}

.compliance-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
}

.compliance-card p {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Pricing Grid */
.pricing-section {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    align-items: stretch;
}

.pricing-card {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2.5rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
    position: relative;
}

.pricing-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.pricing-card.featured {
    border: 2px solid var(--text-primary);
}

.card-badge {
    position: absolute;
    top: -12px;
    right: 24px;
    background-color: var(--text-primary);
    color: var(--bg-primary);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
}

.card-header h3 {
    font-size: 1.375rem;
    margin-bottom: 0.5rem;
}

.card-description {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.price-display {
    font-size: 2.75rem;
    font-weight: 700;
    line-height: 1;
    margin-bottom: 2rem;
}

.price-display .currency {
    font-size: 1.5rem;
    vertical-align: super;
    font-weight: 600;
}

.price-display .period {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-left: 2px;
}

.card-features {
    list-style: none;
    margin-bottom: 2.5rem;
    flex-grow: 1;
}

.card-features li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 0.875rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.card-features li::before {
    content: "✓";
    position: absolute;
    left: 0;
    top: 0;
    color: var(--text-primary);
}

/* FAQ Accordion UI */
.faq-section {
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
}

.faq-accordion-wrapper {
    max-width: 700px;
    margin: 0 auto;
}

.faq-item {
    border-bottom: 1px solid var(--border-color);
}

.faq-trigger {
    width: 100%;
    background: transparent;
    border: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 0;
    font-family: var(--font-family);
    font-size: 1.0625rem;
    font-weight: 600;
    color: var(--text-primary);
    cursor: pointer;
    text-align: left;
}

.faq-icon {
    font-size: 1.25rem;
    color: var(--text-secondary);
    transition: transform var(--transition-fast);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-normal) cubic-bezier(0, 1, 0, 1);
}

.faq-answer p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    padding-bottom: 1.5rem;
    line-height: 1.6;
}

.faq-item.active .faq-icon {
    transform: rotate(45deg);
}

.faq-item.active .faq-answer {
    max-height: 200px; /* arbitrary height to slide down */
    transition: max-height var(--transition-normal) cubic-bezier(1, 0, 1, 0);
}

/* Footer Styles */
.main-footer {
    background-color: var(--text-primary);
    color: var(--bg-secondary);
    padding: 5rem 1.5rem 2.5rem 1.5rem;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    gap: 4rem;
}

.footer-brand {
    max-width: 320px;
}

.footer-brand .logo-wrapper {
    color: var(--bg-primary);
    margin-bottom: 1rem;
}

.footer-brand .logo-dot {
    background-color: var(--bg-primary);
}

.footer-brand p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.footer-links-wrapper {
    display: flex;
    gap: 6rem;
}

.footer-links-col {
    display: flex;
    flex-direction: column;
    gap: 0.875rem;
}

.footer-links-col h4 {
    font-size: 0.8125rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.footer-links-col a {
    font-size: 0.875rem;
    color: var(--text-tertiary);
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    margin-top: 5rem;
    padding-top: 2rem;
    border-top: 1px solid #1f2937;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

/* Responsive Media Queries */
@media (max-width: 1024px) {
    .pricing-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }
    .pricing-card#pricing-card-professional {
        grid-column: span 2;
    }
}

@media (max-width: 768px) {
    h1 { font-size: 2.5rem; }
    .hero-title { font-size: 2.75rem; }
    .hero-subtitle { font-size: 1rem; }
    .hero-cta-wrapper { flex-direction: column; align-items: stretch; max-width: 300px; margin-left: auto; margin-right: auto; }
    
    .tab-panel-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
        padding: 2rem;
    }
    
    .compliance-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    .compliance-card {
        max-width: 100%;
    }
    
    .pricing-grid {
        grid-template-columns: 1fr;
    }
    .pricing-card#pricing-card-professional {
        grid-column: span 1;
    }
    
    .footer-container {
        flex-direction: column;
        gap: 3rem;
    }
    .footer-links-wrapper {
        gap: 3rem;
    }
}

/* Authentication Modal Overlay */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1000;
    background-color: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: none;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
}

.modal-overlay.active {
    display: flex;
}

.modal-card {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 3rem;
    max-width: 460px;
    width: 100%;
    box-shadow: var(--shadow-lg);
    text-align: center;
    position: relative;
    animation: modalScaleIn 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.modal-header-layout {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.modal-header-layout h3 {
    font-size: 1.5rem;
    color: var(--text-primary);
}

.modal-close-btn {
    background: none;
    border: none;
    font-size: 1.75rem;
    color: var(--text-secondary);
    cursor: pointer;
    line-height: 1;
    padding: 0;
}

.modal-close-btn:hover {
    color: var(--text-primary);
}

.modal-subtitle {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    text-align: left;
}

.divider-text {
    display: flex;
    align-items: center;
    text-align: center;
    color: var(--text-tertiary);
    font-size: 0.75rem;
    margin: 1.5rem 0;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.divider-text::before, .divider-text::after {
    content: '';
    flex: 1;
    border-bottom: 1px solid var(--border-color);
}

.divider-text:not(:empty)::before { margin-right: .5em; }
.divider-text:not(:empty)::after { margin-left: .5em; }

.form-group {
    margin-bottom: 1.25rem;
    text-align: left;
}

.form-label {
    display: block;
    font-size: 0.8125rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    font-family: var(--font-family);
    font-size: 0.875rem;
    outline: none;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    transition: border-color var(--transition-fast);
}

.form-control:focus {
    border-color: var(--text-primary);
    background-color: var(--bg-primary);
}

.auth-toggle-btn {
    background: none;
    border: none;
    font-family: var(--font-family);
    font-size: 0.8125rem;
    color: var(--text-secondary);
    cursor: pointer;
    text-decoration: underline;
    margin-top: 1.25rem;
}

.error-message {
    color: #ef4444;
    font-size: 0.8125rem;
    font-weight: 600;
    margin-bottom: 1.25rem;
    text-align: left;
    display: none;
}

.loading-spinner {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255,255,255,0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 0.8s ease-in-out infinite;
    margin-right: 8px;
}

@keyframes modalScaleIn {
    0% { transform: scale(0.95); opacity: 0; }
    100% { transform: scale(1); opacity: 1; }
}

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