/* Tack — App Website Stylesheet */

:root {
    --bg: #ffffff;
    --bg-secondary: #f5f5f7;
    --text: #1d1d1f;
    --text-secondary: #6e6e73;
    --text-tertiary: #86868b;
    --link: #0066CC;
    --link-hover: #004499;
    --border: #d2d2d7;
    --max-width: 720px;
    --font: -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'Segoe UI', system-ui, 'Helvetica Neue', sans-serif;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #1a1a1a;
        --bg-secondary: #222222;
        --text: #f5f5f7;
        --text-secondary: #a1a1a6;
        --text-tertiary: #86868b;
        --link: #2997ff;
        --link-hover: #64b5f6;
        --border: #424245;
    }
}

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

html {
    scroll-padding-top: 80px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font);
    font-size: 17px;
    line-height: 1.7;
    color: var(--text);
    background-color: var(--bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color 0.2s ease, color 0.2s ease;
}

/* Navigation */

nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: var(--bg);
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}

nav .nav-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 16px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

nav .wordmark {
    font-size: 20px;
    font-weight: 700;
    color: var(--text);
    text-decoration: none;
    letter-spacing: -0.02em;
}

nav .wordmark:hover {
    opacity: 0.7;
}

nav .nav-links {
    display: flex;
    gap: 24px;
}

nav .nav-links a {
    font-size: 14px;
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.15s ease;
}

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

nav .nav-links a.active {
    color: var(--text);
    font-weight: 500;
}

/* Main content */

main {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 48px 24px 80px;
}

/* Landing page */

.hero {
    text-align: center;
    padding: 80px 0 48px;
}

.hero h1 {
    font-size: 48px;
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.1;
    margin-bottom: 12px;
}

.hero .tagline {
    font-size: 20px;
    color: var(--text-secondary);
    margin-bottom: 32px;
}

.hero .description {
    font-size: 17px;
    color: var(--text-secondary);
    max-width: 540px;
    margin: 0 auto 40px;
    line-height: 1.6;
}

.hero .links {
    display: flex;
    gap: 32px;
    justify-content: center;
    margin-bottom: 48px;
}

.hero .links a {
    font-size: 15px;
    color: var(--link);
    text-decoration: none;
    padding: 10px 24px;
    border: 1px solid var(--border);
    border-radius: 8px;
    transition: all 0.15s ease;
}

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

.store-note {
    font-size: 13px;
    color: var(--text-tertiary);
}

/* Legal pages */

.legal-header {
    margin-bottom: 40px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border);
}

.legal-header h1 {
    font-size: 32px;
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.2;
    margin-bottom: 8px;
}

.legal-header .effective-date {
    font-size: 14px;
    color: var(--text-tertiary);
}

.legal-intro {
    font-size: 17px;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.7;
}

/* Headings */

h2 {
    font-size: 22px;
    font-weight: 600;
    letter-spacing: -0.01em;
    margin-top: 48px;
    margin-bottom: 16px;
    color: var(--text);
}

h3 {
    font-size: 18px;
    font-weight: 500;
    margin-top: 32px;
    margin-bottom: 12px;
    color: var(--text);
}

/* Paragraphs */

p {
    margin-bottom: 16px;
}

/* Lists */

ul, ol {
    margin-bottom: 16px;
    padding-left: 24px;
}

li {
    margin-bottom: 6px;
    line-height: 1.6;
}

li::marker {
    color: var(--text-tertiary);
}

/* Links */

a {
    color: var(--link);
    text-decoration: none;
    transition: color 0.15s ease;
}

a:hover {
    color: var(--link-hover);
    text-decoration: underline;
}

/* Legal disclaimer blocks (all-caps sections) */

.disclaimer {
    font-size: 14px;
    line-height: 1.6;
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 0.01em;
}

/* Back to top */

.back-to-top {
    display: block;
    text-align: center;
    margin-top: 64px;
    padding-top: 24px;
    border-top: 1px solid var(--border);
    font-size: 13px;
    color: var(--text-tertiary);
    text-decoration: none;
}

.back-to-top:hover {
    color: var(--link);
    text-decoration: none;
}

/* Footer */

footer {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 24px;
    border-top: 1px solid var(--border);
    text-align: center;
}

footer p {
    font-size: 13px;
    color: var(--text-tertiary);
    margin-bottom: 0;
}

footer .footer-links {
    margin-top: 8px;
}

footer .footer-links a {
    font-size: 13px;
    color: var(--text-tertiary);
    text-decoration: none;
    margin: 0 8px;
}

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

/* Print styles */

@media print {
    nav, .back-to-top {
        display: none;
    }

    body {
        font-size: 12pt;
        color: #000;
        background: #fff;
    }

    a {
        color: #000;
        text-decoration: underline;
    }

    footer {
        border-top: 1pt solid #ccc;
    }
}

/* Mobile adjustments */

@media (max-width: 600px) {
    .hero h1 {
        font-size: 36px;
    }

    .hero .tagline {
        font-size: 18px;
    }

    .hero .links {
        flex-direction: column;
        gap: 12px;
        align-items: center;
    }

    .legal-header h1 {
        font-size: 28px;
    }

    h2 {
        font-size: 20px;
    }

    main {
        padding: 32px 20px 60px;
    }
}