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

:root {
    --color-bg: #0a0a0a;
    --color-bg-secondary: #141414;
    --color-text: #ffffff;
    --color-text-secondary: #a0a0a0;
    --color-accent: #06b6d4;
    --color-accent-hover: #0891b2;
    --color-border: #2a2a2a;
    --max-width: 1200px;
    --max-width-section: 1050px;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-smd: 1.5rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 40px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-width: 320px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

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

/* Utility classes */
.section {
    max-width: var(--max-width-section);
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-md);
}

.card {
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: var(--spacing-smd);
}

.card-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.card-title--accent {
    color: var(--color-accent);
}

.card-description {
    color: var(--color-text-secondary);
}

.grid {
    display: grid;
    gap: var(--spacing-md);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-6 { grid-template-columns: repeat(6, 1fr); }

.svg-container svg {
    width: 100%;
    height: 100%;
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background-color: rgba(10, 10, 10, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    user-select: none;
}

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

.logo-text {
    font-size: 1.25rem;
    font-weight: 600;
}

.nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.nav-link {
    color: var(--color-text-secondary);
    transition: color 0.2s;
}

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

/* Buttons */
.btn {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 6px;
    font-weight: 500;
    transition: all 0.2s;
    cursor: pointer;
    border: none;
    font-size: 1rem;
    user-select: none;
}

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

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

.btn-secondary {
    background-color: transparent;
    border: 1px solid var(--color-border);
    color: var(--color-text);
}

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

/* Main content */
main {
    flex: 1;
    padding-top: 80px;
}

/* Hero section */
.hero {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-md);
    text-align: center;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.hero-tagline {
    font-size: 1.5rem;
    color: var(--color-accent);
    margin-bottom: var(--spacing-md);
}

.hero-description {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    max-width: 700px;
    margin: 0 auto var(--spacing-lg);
}

.hero-actions {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
}

.hero-actions .btn {
    padding: calc(var(--spacing-sm)) var(--spacing-md);
}

.hero-hint {
    margin-top: var(--spacing-md);
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}

.hero-hint a {
    color: var(--color-text-secondary);
    text-decoration: underline;
}

.hero-hint a:hover {
    color: var(--color-text);
}

/* Section title */
.section-title {
    font-size: 2rem;
    font-weight: 600;
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

/* How it works section */
.step {
    text-align: center;
    padding: var(--spacing-smd);
}

.step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: 1px solid var(--color-accent);
    color: var(--color-accent);
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    user-select: none;
}

.step-link {
    border: 1px solid transparent;
    border-radius: 12px;
    transition: border-color 0.2s, background-color 0.2s;
}

.step-link:hover {
    border-color: var(--color-border);
    background-color: var(--color-bg-secondary);
}

/* Code examples */
.code-example {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-smd);
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    overflow-x: auto;
}

.code-example code {
    font-family: 'SF Mono', Monaco, 'Courier New', monospace;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    white-space: pre;
}

.code-block {
    max-width: var(--max-width-section);
    margin: var(--spacing-md) auto 0;
}

.code-block:first-of-type {
    margin: var(--spacing-lg) auto 0;
}

.code-label {
    display: block;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-xs);
}

.code-block .code-example {
    margin-top: 0;
}

.code-docs-link {
    display: inline-block;
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--color-accent);
    font-size: 0.875rem;
    border: 1px solid var(--color-accent);
    border-radius: 8px;
    user-select: none;
}

.code-docs-link:hover {
    background-color: var(--color-accent);
    color: var(--color-bg);
}

.hl-cmd { color: #f472b6; }
.hl-url { color: #60a5fa; }
.hl-flag { color: #a78bfa; }
.hl-str { color: #4ade80; }
.hl-key { color: #06b6d4; }
.hl-num { color: #fb923c; }

.code-wrapper {
    position: relative;
}

.code-copy-btn {
    position: absolute;
    top: var(--spacing-xs);
    right: var(--spacing-xs);
    width: 32px;
    height: 32px;
    padding: 6px;
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all 0.2s;
    z-index: 1;
}

.code-copy-btn:hover {
    color: var(--color-text);
    border-color: var(--color-text-secondary);
}

.code-copy-btn svg {
    width: 100%;
    height: 100%;
}

.code-copy-tooltip {
    position: absolute;
    right: 100%;
    top: 50%;
    transform: translateY(-50%);
    margin-right: 6px;
    height: 24px;
    padding: 0 8px;
    display: flex;
    align-items: center;
    background-color: var(--color-accent);
    color: var(--color-bg);
    font-size: 0.75rem;
    font-weight: 500;
    border-radius: 4px;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s, visibility 0.2s;
    pointer-events: none;
    cursor: default;
    user-select: none;
}

.code-copy-btn.copied .code-copy-tooltip {
    opacity: 1;
    visibility: visible;
}

/* Pricing section */
.pricing-grid {
    max-width: var(--max-width-section);
    margin: 0 auto;
}

.pricing-card {
    position: relative;
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: var(--spacing-md);
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.pricing-card-featured {
    border-color: var(--color-accent);
}

.pricing-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--color-accent);
    color: var(--color-bg);
    font-size: 0.75rem;
    font-weight: 600;
    padding: 4px 12px;
    border-radius: 12px;
}

.pricing-plan {
    font-size: 1.25rem;
    font-weight: 600;
}

.pricing-price {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 4px;
}

.pricing-amount {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-accent);
}

.pricing-period {
    font-size: 1rem;
    color: var(--color-text-secondary);
}

.pricing-features {
    list-style: none;
    text-align: left;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

.pricing-features li {
    padding: var(--spacing-xs) 0;
    border-bottom: 1px solid var(--color-border);
}

.pricing-features li:last-child {
    border-bottom: none;
}

.pricing-card .btn {
    margin-top: auto;
}

/* Footer */
.footer {
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-md);
}

.footer-content {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.legal-links {
    display: flex;
    gap: var(--spacing-sm);
}

.legal-links a {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    transition: color 0.2s;
}

.legal-links a:hover {
    color: var(--color-text);
}

.social-links {
    display: flex;
    gap: var(--spacing-sm);
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 8px;
    color: var(--color-text-secondary);
    transition: all 0.2s;
}

.social-link:hover {
    color: var(--color-text);
    background-color: var(--color-bg-secondary);
}

.social-link svg {
    width: 20px;
    height: 20px;
}

/* Data Sources section */
.data-sources {
    text-align: center;
}

.data-sources-subtitle {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
}

.sources-grid {
    margin-bottom: var(--spacing-md);
}

.source-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm);
    border-radius: 12px;
    transition: background-color 0.2s;
}

.source-item:hover {
    background-color: var(--color-bg-secondary);
}

.source-logo {
    width: 64px;
    height: 64px;
    color: var(--color-text-secondary);
    transition: color 0.2s;
}

.source-item:hover .source-logo {
    color: var(--color-accent);
}

.source-name {
    font-size: 0.75rem;
    color: var(--color-text-secondary);
    text-align: center;
}

.data-sources-note {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

.section--last {
    padding-bottom: calc(var(--spacing-xl) + 100px);
}

/* Engineering section */
.engineering-tagline {
    text-align: center;
    font-size: 1.125rem;
    color: var(--color-accent);
    margin-bottom: var(--spacing-lg);
}

/* Contact section */
.contact-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: var(--spacing-md);
    transition: border-color 0.2s;
}

.contact-item:hover {
    border-color: var(--color-accent);
}

.contact-icon {
    width: 48px;
    height: 48px;
    color: var(--color-accent);
    margin-bottom: var(--spacing-sm);
}

.contact-description {
    font-size: 0.875rem;
}

/* Mobile responsive */
@media (max-width: 768px) {
    .section {
        padding: var(--spacing-lg) var(--spacing-sm);
    }

    .grid {
        gap: var(--spacing-sm);
    }

    .grid-2,
    .grid-3 {
        grid-template-columns: 1fr;
    }

    .grid-6 {
        grid-template-columns: repeat(3, 1fr);
    }

    .header-content {
        padding: var(--spacing-sm);
    }

    .nav {
        gap: var(--spacing-sm);
    }

    .nav-link {
        display: none;
    }

    .hero {
        padding: var(--spacing-lg) var(--spacing-sm);
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-tagline {
        font-size: 1.25rem;
    }

    .hero-description {
        font-size: 1rem;
    }

    .hero-actions {
        flex-direction: column;
        align-items: center;
    }

    .hero-actions .btn {
        width: 100%;
        max-width: 280px;
        text-align: center;
    }

    .section-title {
        font-size: 1.5rem;
    }

    .source-logo {
        width: 48px;
        height: 48px;
    }

    .footer-content {
        flex-direction: column;
        gap: var(--spacing-sm);
        text-align: center;
    }

    .section--last {
        padding-bottom: calc(var(--spacing-lg) + 100px);
    }
}