:root {
    --color-brand-1: #667eea;
    --color-brand-2: #764ba2;
    --color-ink: #1a1c2c;
    --color-ink-soft: #4a4d63;
    --color-ink-faint: #6b6e85;
    --color-bg: #fafbff;
    --color-surface: #ffffff;
    --color-surface-2: #f3f4fb;
    --color-border: #e3e5f0;
    --color-accent: #4c6ef5;
    --color-success: #2f9e44;
    --color-error: #d6336c;
    --shadow-card: 0 2px 8px rgba(31, 38, 91, 0.06), 0 12px 32px rgba(31, 38, 91, 0.06);
    --shadow-hover: 0 4px 16px rgba(31, 38, 91, 0.10), 0 20px 48px rgba(31, 38, 91, 0.08);
    --radius-1: 8px;
    --radius-2: 14px;
    --radius-pill: 999px;
    --font-body: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-mono: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }

html { color-scheme: light; }

body {
    margin: 0;
    font-family: var(--font-body);
    color: var(--color-ink);
    background: var(--color-bg);
    line-height: 1.55;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a { color: var(--color-accent); text-decoration: none; }
a:hover { text-decoration: underline; }

code, pre { font-family: var(--font-mono); font-size: 0.92em; }
pre {
    background: var(--color-surface-2);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-1);
    padding: 12px 14px;
    overflow-x: auto;
    line-height: 1.45;
}

.container {
    width: 100%;
    max-width: 960px;
    margin: 0 auto;
    padding: 0 24px;
}
.container.narrow { max-width: 720px; }

.visually-hidden {
    position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
    overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}

/* ============ Header ============ */
.site-header {
    background: linear-gradient(135deg, var(--color-brand-1), var(--color-brand-2));
    color: white;
    padding: 14px 0;
    box-shadow: 0 2px 12px rgba(31, 38, 91, 0.12);
    position: sticky;
    top: 0;
    z-index: 10;
}
.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}
.brand {
    color: white;
    font-weight: 700;
    font-size: 1.15rem;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    letter-spacing: -0.01em;
}
.brand:hover { text-decoration: none; }
.brand-mark {
    display: inline-block; width: 12px; height: 12px;
    border-radius: 50%; background: white;
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.25);
}
.site-nav { display: flex; gap: 22px; flex-wrap: wrap; }
.site-nav a {
    color: rgba(255, 255, 255, 0.92);
    font-weight: 500;
    font-size: 0.96rem;
    padding: 6px 2px;
    border-bottom: 2px solid transparent;
    transition: border-color 120ms ease;
}
.site-nav a:hover { color: white; border-bottom-color: rgba(255, 255, 255, 0.7); text-decoration: none; }
.site-nav a.nav-external::after { content: " ↗"; opacity: 0.7; }

/* ============ Hero ============ */
.hero { padding: 64px 0 40px; }
.hero h1 {
    font-size: clamp(2.1rem, 4.5vw, 3.2rem);
    line-height: 1.1;
    letter-spacing: -0.02em;
    margin: 0 0 14px;
}
.hero-accent {
    background: linear-gradient(135deg, var(--color-brand-1), var(--color-brand-2));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}
.hero-sub {
    font-size: 1.15rem;
    color: var(--color-ink-soft);
    max-width: 640px;
    margin: 0 0 32px;
}
.lookup-form {
    display: flex;
    gap: 8px;
    max-width: 560px;
    background: var(--color-surface);
    padding: 8px;
    border-radius: var(--radius-2);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-card);
}
.lookup-form input {
    flex: 1 1 auto;
    border: none;
    background: transparent;
    font-family: var(--font-mono);
    font-size: 1.05rem;
    padding: 10px 12px;
    color: var(--color-ink);
    outline: none;
    min-width: 0;
}
.lookup-form button {
    border: none;
    background: linear-gradient(135deg, var(--color-brand-1), var(--color-brand-2));
    color: white;
    font-weight: 600;
    font-size: 0.98rem;
    padding: 10px 22px;
    border-radius: var(--radius-1);
    cursor: pointer;
    transition: transform 80ms ease, box-shadow 120ms ease;
}
.lookup-form button:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 14px rgba(102, 126, 234, 0.35);
}
.lookup-form button:disabled {
    opacity: 0.6;
    cursor: progress;
    transform: none;
    box-shadow: none;
}
.hero-hint {
    color: var(--color-ink-faint);
    font-size: 0.88rem;
    margin: 10px 0 0;
}

/* ============ Result card ============ */
.result {
    margin-top: 28px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-2);
    box-shadow: var(--shadow-card);
    padding: 22px 24px;
    max-width: 720px;
}
.result.hidden { display: none; }
.result.error { border-color: var(--color-error); }
.result-header {
    display: flex;
    align-items: baseline;
    gap: 12px;
    margin-bottom: 12px;
}
.result-ip {
    font-family: var(--font-mono);
    font-size: 1.1rem;
    font-weight: 600;
}
.badges { display: flex; gap: 6px; flex-wrap: wrap; }
.badge {
    display: inline-block;
    font-size: 0.78rem;
    font-weight: 600;
    padding: 3px 10px;
    border-radius: var(--radius-pill);
    background: var(--color-surface-2);
    color: var(--color-ink-soft);
    border: 1px solid var(--color-border);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}
.badge.ok { background: #e8f7ec; color: #1f7a30; border-color: #c9ecd2; }
.badge.warn { background: #fff4e0; color: #9a5a00; border-color: #f5dca7; }
.badge.bad { background: #fde7ee; color: #a02050; border-color: #f6c5d4; }
.badge.brand { background: rgba(102, 126, 234, 0.12); color: #3a4dbf; border-color: rgba(102, 126, 234, 0.3); }

.result-grid {
    display: grid;
    grid-template-columns: max-content 1fr;
    gap: 10px 16px;
    margin-top: 14px;
}
.result-grid dt { color: var(--color-ink-faint); font-size: 0.92rem; }
.result-grid dd {
    margin: 0;
    font-family: var(--font-mono);
    font-size: 0.95rem;
}

/* ============ Country display ============ */
.country-display { font-family: var(--font-body); }
.country-flag { font-size: 1.4em; vertical-align: middle; }
.country-code { font-family: var(--font-mono); color: var(--color-ink-faint); font-size: 0.88em; }
.country-unknown { font-family: var(--font-mono); color: var(--color-ink-faint); }

/* ============ Surfaces section ============ */
.surfaces { padding: 48px 0; background: var(--color-surface); border-top: 1px solid var(--color-border); border-bottom: 1px solid var(--color-border); }
.surfaces h2 {
    text-align: center;
    margin: 0 0 32px;
    font-size: clamp(1.5rem, 3vw, 2rem);
    letter-spacing: -0.01em;
}
.surface-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px;
}
.surface-card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-2);
    padding: 22px 22px 18px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.surface-card h3 { margin: 0; font-size: 1.15rem; }
.surface-card p { margin: 0; color: var(--color-ink-soft); font-size: 0.96rem; }
.surface-card pre { margin: 4px 0 0; font-size: 0.82rem; }
.surface-link {
    margin-top: auto;
    font-weight: 600;
    font-size: 0.95rem;
}

/* ============ CTA strip ============ */
.cta-strip { padding: 36px 0; }
.cta-strip p {
    text-align: center;
    color: var(--color-ink-soft);
    max-width: 680px;
    margin: 0 auto;
    font-size: 1rem;
}

/* ============ Learn page ============ */
.learn-hero { padding: 56px 0 24px; }
.learn-hero h1 { font-size: clamp(2rem, 4vw, 2.8rem); margin: 0 0 10px; letter-spacing: -0.02em; }
.learn-sub { color: var(--color-ink-soft); font-size: 1.08rem; margin: 0 0 24px; max-width: 640px; }
.learn-toc {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}
.learn-toc a {
    display: inline-block;
    padding: 6px 12px;
    border-radius: var(--radius-pill);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    font-size: 0.88rem;
    color: var(--color-ink-soft);
}
.learn-toc a:hover { background: var(--color-surface-2); text-decoration: none; color: var(--color-ink); }

.learn-body { padding: 24px 0 64px; }
.learn-body details {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-2);
    margin: 12px 0;
    box-shadow: var(--shadow-card);
    overflow: hidden;
}
.learn-body details[open] { box-shadow: var(--shadow-hover); }
.learn-body summary {
    cursor: pointer;
    list-style: none;
    padding: 16px 22px;
    font-weight: 600;
    font-size: 1.05rem;
    display: flex;
    align-items: center;
    gap: 8px;
    user-select: none;
}
.learn-body summary::-webkit-details-marker { display: none; }
.learn-body summary::before {
    content: "+";
    display: inline-block;
    width: 20px;
    color: var(--color-brand-1);
    font-weight: 700;
    font-size: 1.2rem;
    transition: transform 150ms ease;
}
.learn-body details[open] > summary::before { content: "−"; }
.details-body {
    padding: 0 22px 18px;
    color: var(--color-ink-soft);
}
.details-body p { margin: 0.6em 0; }
.details-body ul, .details-body ol { margin: 0.6em 0; padding-left: 1.4em; }
.details-body code { background: var(--color-surface-2); padding: 1px 5px; border-radius: 4px; }

.api-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 8px;
    font-size: 0.94rem;
}
.api-table th, .api-table td {
    text-align: left;
    padding: 10px 12px;
    border-bottom: 1px solid var(--color-border);
}
.api-table th {
    background: var(--color-surface-2);
    font-weight: 600;
    color: var(--color-ink);
}
.api-table td:first-child { font-family: var(--font-mono); white-space: nowrap; }

/* ============ Pricing page ============ */
.pricing-soon { padding: 56px 0 64px; }
.pricing-soon h1 { font-size: clamp(2rem, 4vw, 2.8rem); margin: 0 0 10px; letter-spacing: -0.02em; }
.pricing-soon .lede { color: var(--color-ink-soft); font-size: 1.1rem; margin: 0 0 32px; }
.pricing-rows { display: grid; gap: 14px; }
.pricing-row {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-2);
    padding: 20px 22px;
    box-shadow: var(--shadow-card);
}
.pricing-row h3 { margin: 0 0 6px; font-size: 1.1rem; }
.pricing-row p { margin: 0; color: var(--color-ink-soft); }
.pricing-footer { margin-top: 28px; color: var(--color-ink-faint); font-size: 0.95rem; }

/* ============ Footer ============ */
.site-footer {
    padding: 28px 0;
    border-top: 1px solid var(--color-border);
    background: var(--color-surface);
    color: var(--color-ink-faint);
    font-size: 0.92rem;
}
.footer-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
}
.footer-tag { font-style: italic; }
.footer-meta a { color: var(--color-ink-soft); }

/* ============ Focus ============ */
*:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

@media (max-width: 600px) {
    .hero { padding: 40px 0 24px; }
    .surfaces { padding: 36px 0; }
    .lookup-form { flex-direction: column; }
    .lookup-form button { width: 100%; }
    .footer-inner { flex-direction: column; align-items: flex-start; }
}