/* Tether brand stylesheet */

:root {
    --color-primary: #1D9E75;
    --color-background: #F8F7F4;
    --color-surface: #FFFFFF;
    --color-text-primary: #1A1A1A;
    --color-text-secondary: #6B6B6B;
    --color-border: #E8E6E1;
    --color-premium: #7F77DD;
    --color-severe: #D85A30;
    --color-warning: #EF9F27;
    --color-safe: #639922;
    --radius: 12px;
    --max-width: 880px;
}

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
    background: var(--color-background);
    color: var(--color-text-primary);
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Helvetica, Arial, sans-serif;
    font-size: 17px;
    line-height: 1.55;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: var(--color-primary);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 32px 24px 64px;
}

/* Top navigation */
.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    max-width: var(--max-width);
    margin: 0 auto;
}

.nav-brand {
    font-family: -apple-system, "SF Pro Rounded", system-ui, sans-serif;
    font-weight: 500;
    font-size: 22px;
    color: var(--color-primary);
}

.nav-links {
    display: flex;
    gap: 20px;
    font-size: 15px;
}

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

.nav-links a:hover {
    color: var(--color-text-primary);
    text-decoration: none;
}

/* Hero */
.hero {
    text-align: center;
    padding: 56px 24px 40px;
}

.hero h1 {
    font-family: -apple-system, "SF Pro Rounded", system-ui, sans-serif;
    font-weight: 500;
    font-size: 56px;
    color: var(--color-primary);
    margin: 0 0 8px;
    letter-spacing: -0.5px;
}

.hero .tagline {
    font-family: -apple-system, "SF Pro Rounded", system-ui, sans-serif;
    font-size: 22px;
    color: var(--color-text-secondary);
    margin: 0 0 24px;
    font-weight: 400;
}

.hero .lede {
    max-width: 580px;
    margin: 0 auto 32px;
    color: var(--color-text-primary);
}

.cta {
    display: inline-block;
    background: var(--color-primary);
    color: #FFF;
    padding: 14px 24px;
    border-radius: var(--radius);
    font-weight: 600;
    font-size: 16px;
}

.cta:hover {
    text-decoration: none;
    opacity: 0.92;
}

/* Sections */
section {
    padding: 32px 0;
}

h2 {
    font-family: -apple-system, "SF Pro Rounded", system-ui, sans-serif;
    font-size: 28px;
    font-weight: 500;
    margin: 0 0 16px;
}

h3 {
    font-size: 18px;
    font-weight: 600;
    margin: 24px 0 6px;
}

p, li {
    color: var(--color-text-primary);
}

/* Feature cards */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 16px;
    margin-top: 24px;
}

.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 20px;
}

.card h3 {
    margin-top: 0;
}

.card p {
    margin: 8px 0 0;
    color: var(--color-text-secondary);
    font-size: 15px;
}

.card .icon {
    font-size: 22px;
    margin-bottom: 8px;
    display: block;
}

.tier-badge {
    display: inline-block;
    font-size: 12px;
    font-weight: 600;
    padding: 2px 8px;
    border-radius: 999px;
    margin-left: 8px;
    vertical-align: middle;
}

.tier-badge.free {
    background: rgba(29, 158, 117, 0.12);
    color: var(--color-primary);
}

.tier-badge.premium {
    background: rgba(127, 119, 221, 0.12);
    color: var(--color-premium);
}

/* Pricing */
.pricing {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 24px;
    margin-top: 24px;
}

.pricing .plan {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    padding: 12px 0;
    border-bottom: 1px solid var(--color-border);
}

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

.pricing .plan-name {
    font-weight: 600;
}

.pricing .plan-price {
    font-family: -apple-system, "SF Pro Rounded", system-ui, sans-serif;
    font-size: 22px;
    font-weight: 500;
    color: var(--color-primary);
}

.pricing .plan-period {
    color: var(--color-text-secondary);
    font-size: 14px;
}

/* Document pages (privacy, support) */
.doc {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 32px;
}

.doc h1 {
    font-family: -apple-system, "SF Pro Rounded", system-ui, sans-serif;
    font-size: 32px;
    font-weight: 500;
    margin: 0 0 8px;
}

.doc .meta {
    color: var(--color-text-secondary);
    font-size: 14px;
    margin-bottom: 24px;
}

.doc h2 {
    font-size: 20px;
    margin-top: 32px;
    margin-bottom: 8px;
}

.doc p, .doc li {
    color: var(--color-text-primary);
    font-size: 16px;
}

.doc ul {
    padding-left: 22px;
}

.doc li {
    margin: 6px 0;
}

.callout {
    background: rgba(29, 158, 117, 0.08);
    border: 1px solid rgba(29, 158, 117, 0.25);
    border-radius: var(--radius);
    padding: 16px 18px;
    margin: 20px 0;
    color: var(--color-text-primary);
    font-size: 15px;
}

/* Footer */
footer {
    border-top: 1px solid var(--color-border);
    padding: 32px 24px;
    margin-top: 48px;
    text-align: center;
    color: var(--color-text-secondary);
    font-size: 14px;
}

footer .footer-links {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 12px;
    flex-wrap: wrap;
}

footer .footer-links a {
    color: var(--color-text-secondary);
}

footer .footer-links a:hover {
    color: var(--color-text-primary);
    text-decoration: none;
}

/* Responsive */
@media (max-width: 600px) {
    .hero h1 { font-size: 42px; }
    .hero .tagline { font-size: 18px; }
    .doc { padding: 22px; }
    h2 { font-size: 22px; }
}