/* ─── Reset & custom properties ─────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --color-primary:    #2e7d52;
    --color-primary-dk: #1f5e3c;
    --color-accent:     #4caf7a;
    --color-accent-lt:  #d4edda;
    --color-nav:        #1a3a2a;
    --color-nav-hover:  #2e5c3e;
    --color-bg:         #f8faf9;
    --color-bg-card:    #ffffff;
    --color-text:       #1a1a2e;
    --color-text-muted: #5a6472;
    --color-border:     #dde5e2;
    --color-hero-bg:    #1a3a2a;

    --font-base: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    --font-mono: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;

    --radius-sm:  4px;
    --radius-md:  8px;
    --radius-lg:  16px;
    --shadow-sm:  0 1px 3px rgba(0,0,0,.08);
    --shadow-md:  0 4px 16px rgba(0,0,0,.10);
    --shadow-lg:  0 8px 32px rgba(0,0,0,.12);

    --max-width: 1100px;
    --nav-height: 64px;
}

/* ─── Base ───────────────────────────────────────────────────────────────────── */
html { scroll-behavior: smooth; font-size: 16px; }
body {
    font-family: var(--font-base);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.65;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}
main { flex: 1; }

a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

img { max-width: 100%; height: auto; }

/* ─── Skip link ──────────────────────────────────────────────────────────────── */
.skip-link {
    position: absolute;
    top: -100%;
    left: 8px;
    background: var(--color-nav);
    color: #fff;
    padding: .5rem 1rem;
    border-radius: 0 0 var(--radius-md) var(--radius-md);
    z-index: 1000;
    font-size: .875rem;
    transition: top .15s;
}
.skip-link:focus { top: 0; }

/* ─── Navigation ─────────────────────────────────────────────────────────────── */
.site-header { position: sticky; top: 0; z-index: 100; }
.main-nav {
    background: var(--color-nav);
    height: var(--nav-height);
    box-shadow: 0 2px 8px rgba(0,0,0,.3);
}
.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.25rem;
    height: 100%;
    display: flex;
    align-items: center;
    gap: 2rem;
}
.nav-logo {
    color: #fff;
    font-weight: 700;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    gap: .5rem;
    white-space: nowrap;
    text-decoration: none;
    flex-shrink: 0;
}
.nav-logo:hover { text-decoration: none; opacity: .9; }
.logo-icon { font-size: 1.1em; }

.nav-links {
    display: flex;
    list-style: none;
    gap: .25rem;
    margin-left: auto;
}
.nav-links a {
    color: rgba(255,255,255,.85);
    padding: .45rem .75rem;
    border-radius: var(--radius-sm);
    font-size: .9rem;
    font-weight: 500;
    transition: background .15s, color .15s;
    text-decoration: none;
    white-space: nowrap;
}
.nav-links a:hover,
.nav-links a[aria-current="page"] {
    background: var(--color-nav-hover);
    color: #fff;
    text-decoration: none;
}
.nav-links a[aria-current="page"] {
    background: var(--color-primary);
}

/* Hamburger */
.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 28px;
    height: 20px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    margin-left: auto;
}
.nav-toggle span {
    display: block;
    width: 100%;
    height: 2px;
    background: #fff;
    border-radius: 2px;
    transition: transform .2s, opacity .2s;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(9px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-9px) rotate(-45deg); }

/* ─── Utility ────────────────────────────────────────────────────────────────── */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.25rem;
}

/* ─── Hero ───────────────────────────────────────────────────────────────────── */
.hero {
    background: linear-gradient(145deg, var(--color-hero-bg) 0%, #0d2218 100%);
    color: #fff;
    padding: 4rem 1.25rem 3rem;
    text-align: center;
}
.hero-inner {
    max-width: 860px;
    margin: 0 auto;
}
.hero h1 {
    font-size: clamp(1.75rem, 5vw, 2.75rem);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: .75rem;
    letter-spacing: -.02em;
}
.hero-sub {
    font-size: clamp(1rem, 2.5vw, 1.2rem);
    color: rgba(255,255,255,.8);
    margin-bottom: 2.5rem;
}
.widget-wrapper {
    background: rgba(255,255,255,.05);
    border: 1px solid rgba(255,255,255,.1);
    border-radius: var(--radius-lg);
    padding: 2rem 1rem;
    min-height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(4px);
}
.widget-wrapper > * { width: 100%; }

/* ─── Home intro ─────────────────────────────────────────────────────────────── */
.home-intro {
    background: var(--color-accent-lt);
    padding: 2rem 1.25rem;
    border-bottom: 1px solid var(--color-border);
}
.home-intro .container {
    max-width: 760px;
    font-size: 1.05rem;
    color: var(--color-text);
}

/* ─── Cards ──────────────────────────────────────────────────────────────────── */
.content-cards {
    padding: 3.5rem 1.25rem;
}
.section-title {
    text-align: center;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary-dk);
    margin-bottom: 2rem;
}
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    max-width: var(--max-width);
    margin: 0 auto;
}
.card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 1.75rem;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-sm);
    transition: box-shadow .2s, transform .2s;
}
.card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-3px);
}
.card-icon {
    font-size: 2rem;
    margin-bottom: .75rem;
}
.card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--color-primary-dk);
    margin-bottom: .5rem;
}
.card p {
    color: var(--color-text-muted);
    font-size: .95rem;
    flex: 1;
    margin-bottom: 1.25rem;
    line-height: 1.6;
}
.card-link {
    color: var(--color-primary);
    font-weight: 600;
    font-size: .9rem;
    align-self: flex-start;
    padding: .5rem .9rem;
    border: 2px solid var(--color-primary);
    border-radius: var(--radius-sm);
    transition: background .15s, color .15s;
    text-decoration: none;
}
.card-link:hover {
    background: var(--color-primary);
    color: #fff;
    text-decoration: none;
}

/* ─── Page content ───────────────────────────────────────────────────────────── */
.page-wrap {
    max-width: 820px;
    margin: 0 auto;
    padding: 3rem 1.25rem 4rem;
}
.page-header {
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 3px solid var(--color-accent);
}
.page-header h1 {
    font-size: clamp(1.5rem, 4vw, 2.25rem);
    font-weight: 800;
    color: var(--color-nav);
    line-height: 1.2;
}
.page-meta {
    margin-top: 2.5rem;
    padding-top: 1rem;
    border-top: 1px solid var(--color-border);
    color: var(--color-text-muted);
    font-size: .85rem;
}

/* Prose styles (DB content) */
.prose h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-nav);
    margin: 2rem 0 .75rem;
    line-height: 1.3;
}
.prose h3 {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-primary-dk);
    margin: 1.5rem 0 .5rem;
}
.prose p { margin-bottom: 1rem; }
.prose ul, .prose ol {
    margin: .75rem 0 1rem 1.5rem;
}
.prose li { margin-bottom: .35rem; }
.prose strong { color: var(--color-nav); }
.prose em { font-style: italic; }
.prose code {
    font-family: var(--font-mono);
    background: var(--color-accent-lt);
    padding: .15em .4em;
    border-radius: var(--radius-sm);
    font-size: .875em;
    color: var(--color-primary-dk);
}
.prose table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.25rem 0 1.5rem;
    font-size: .9rem;
    overflow-x: auto;
    display: block;
}
.prose table thead {
    background: var(--color-nav);
    color: #fff;
}
.prose table th,
.prose table td {
    padding: .6rem .9rem;
    border: 1px solid var(--color-border);
    text-align: left;
}
.prose table tr:nth-child(even) { background: var(--color-bg); }
.prose a { color: var(--color-primary); text-decoration: underline; }
.prose a:hover { color: var(--color-primary-dk); }

/* FAQ details/summary */
.prose details {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    margin-bottom: .75rem;
    overflow: hidden;
}
.prose details[open] { border-color: var(--color-accent); }
.prose summary {
    padding: 1rem 1.1rem;
    font-weight: 600;
    cursor: pointer;
    background: var(--color-bg-card);
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: .5rem;
    color: var(--color-nav);
    transition: background .15s;
    user-select: none;
}
.prose summary::-webkit-details-marker { display: none; }
.prose summary::after {
    content: '+';
    font-size: 1.3rem;
    font-weight: 300;
    color: var(--color-primary);
    flex-shrink: 0;
    transition: transform .2s;
}
.prose details[open] summary::after { content: '−'; }
.prose details[open] summary { background: var(--color-accent-lt); }
.prose details > *:not(summary) {
    padding: 1rem 1.1rem 1.1rem;
    background: var(--color-bg-card);
}

/* ─── Buttons ────────────────────────────────────────────────────────────────── */
.btn-primary {
    display: inline-block;
    background: var(--color-primary);
    color: #fff;
    padding: .7rem 1.5rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: .95rem;
    border: none;
    cursor: pointer;
    text-decoration: none;
    transition: background .15s, box-shadow .15s;
    box-shadow: var(--shadow-sm);
}
.btn-primary:hover {
    background: var(--color-primary-dk);
    text-decoration: none;
    box-shadow: var(--shadow-md);
}

/* ─── 404 ────────────────────────────────────────────────────────────────────── */
.error-page {
    padding: 5rem 1.25rem;
    text-align: center;
}
.error-inner {
    max-width: 480px;
    margin: 0 auto;
}
.error-code {
    font-size: clamp(5rem, 20vw, 9rem);
    font-weight: 900;
    color: var(--color-accent);
    line-height: 1;
    display: block;
    opacity: .25;
    margin-bottom: .5rem;
}
.error-page h1 {
    font-size: 1.75rem;
    margin-bottom: .75rem;
    color: var(--color-nav);
}
.error-page p {
    color: var(--color-text-muted);
    margin-bottom: 1.5rem;
}

/* ─── Ad strip ───────────────────────────────────────────────────────────────── */
.ad-strip {
    background: var(--color-bg);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
    padding: .75rem 1.25rem;
}
.ad-inner { max-width: var(--max-width); margin: 0 auto; }

/* ─── Footer ─────────────────────────────────────────────────────────────────── */
.site-footer {
    background: var(--color-nav);
    color: rgba(255,255,255,.75);
    padding: 2.5rem 1.25rem 1.5rem;
    margin-top: auto;
}
.footer-container {
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 1rem 2rem;
    align-items: start;
}
.footer-brand {
    grid-column: 1 / -1;
    display: flex;
    align-items: center;
    gap: .6rem;
    flex-wrap: wrap;
}
.footer-brand strong { color: #fff; font-size: 1.05rem; }
.footer-brand p {
    width: 100%;
    margin-top: .25rem;
    font-size: .85rem;
    color: rgba(255,255,255,.55);
}
.footer-nav {
    display: flex;
    gap: 1.25rem;
    flex-wrap: wrap;
}
.footer-nav a {
    color: rgba(255,255,255,.75);
    font-size: .875rem;
    text-decoration: none;
    transition: color .15s;
}
.footer-nav a:hover { color: #fff; text-decoration: underline; }
.footer-copy {
    font-size: .8rem;
    color: rgba(255,255,255,.45);
    grid-column: 1 / -1;
    margin-top: .5rem;
}

/* ─── Responsive ─────────────────────────────────────────────────────────────── */
@media (max-width: 768px) {
    .nav-toggle { display: flex; }
    .nav-links {
        display: none;
        position: absolute;
        top: var(--nav-height);
        left: 0;
        right: 0;
        background: var(--color-nav);
        flex-direction: column;
        gap: 0;
        padding: .5rem 0 1rem;
        box-shadow: 0 4px 12px rgba(0,0,0,.3);
        z-index: 99;
    }
    .nav-links.is-open { display: flex; }
    .nav-links a {
        padding: .75rem 1.25rem;
        border-radius: 0;
        font-size: 1rem;
    }

    .hero { padding: 2.5rem 1rem 2rem; }

    .cards-grid { grid-template-columns: 1fr; }

    .footer-container { grid-template-columns: 1fr; }
    .footer-nav { margin-top: .25rem; }
}

@media (max-width: 480px) {
    .page-wrap { padding: 2rem 1rem 3rem; }
    .prose table { font-size: .8rem; }
}

/* ─── IPv6 Check widget ──────────────────────────────────────────────────────── */
.ipv6-widget {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin-bottom: 0;
    box-shadow: var(--shadow-md);
}
.ipv6-widget-head {
    background: linear-gradient(135deg, var(--color-nav) 0%, var(--color-primary-dk) 100%);
    color: #fff;
    padding: 1.5rem 1.75rem 1.25rem;
}
.ipv6-widget-head h2 {
    font-size: 1.35rem;
    font-weight: 800;
    margin: 0 0 .25rem;
    color: #fff;
}
.ipv6-widget-head p {
    margin: 0;
    color: rgba(255,255,255,.8);
    font-size: .9rem;
}

/* Idle */
.ipv6-idle {
    padding: 2.5rem 1.75rem;
    text-align: center;
}
.btn-check {
    font-size: 1.05rem;
    padding: .85rem 2rem;
    border-radius: var(--radius-md);
    gap: .5rem;
}
.btn-check-sm {
    font-size: .9rem;
    padding: .6rem 1.25rem;
}

/* Loading */
.ipv6-loading {
    padding: 3rem 1.75rem;
    text-align: center;
    color: var(--color-text-muted);
}
.ipv6-loading p { margin-top: 1rem; font-size: .95rem; }
.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin .8s linear infinite;
    margin: 0 auto;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Error */
.ipv6-error {
    padding: 2rem 1.75rem;
    text-align: center;
    color: #c0392b;
}
.ipv6-error p { margin-bottom: 1rem; font-size: .95rem; }

/* Status banner */
.ipv6-status-banner {
    padding: 1.1rem 1.75rem;
    border-left: 5px solid transparent;
    margin: 0;
}
.ipv6-status-banner strong {
    display: block;
    font-size: 1.15rem;
    margin-bottom: .3rem;
}
.ipv6-status-banner p { margin: 0; font-size: .9rem; line-height: 1.5; }
.banner-ok   { background: #eaf7ee; border-color: var(--color-accent); color: #1a5e33; }
.banner-warn { background: #fef3e2; border-color: #e67e22;             color: #7d4100; }
.banner-no   { background: #fdecea; border-color: #c0392b;             color: #7b1e14; }

/* Info grid */
.ipv6-info-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1px;
    background: var(--color-border);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}
.ipv6-info-card {
    background: var(--color-bg-card);
    padding: 1rem 1.75rem;
}
.ipv6-info-label {
    font-size: .75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .05em;
    color: var(--color-text-muted);
    margin-bottom: .3rem;
}
.ipv6-info-value {
    font-size: 1.05rem;
    font-weight: 700;
    font-family: var(--font-mono);
    color: var(--color-nav);
    word-break: break-all;
}

/* Protocol badges */
.proto-badge {
    display: inline-block;
    padding: .25rem .65rem;
    border-radius: 20px;
    font-size: .85rem;
    font-weight: 700;
    font-family: var(--font-base);
}
.badge-ipv6   { background: var(--color-accent); color: #fff; }
.badge-ipv4   { background: #3498db;             color: #fff; }
.badge-mapped { background: #e67e22;             color: #fff; }

/* Local addresses */
.ipv6-local {
    padding: 1.25rem 1.75rem;
    border-top: 1px solid var(--color-border);
}
.ipv6-local h3 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-nav);
    margin-bottom: .25rem;
}
.ipv6-local-sub {
    font-size: .82rem;
    color: var(--color-text-muted);
    margin-bottom: .75rem;
}
.ipv6-addr-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: .4rem;
    margin-bottom: .75rem;
}
.addr-item {
    display: flex;
    align-items: center;
    gap: .65rem;
    padding: .4rem .75rem;
    background: var(--color-bg);
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
}
.addr-item.addr-ipv6 { border-color: rgba(76,175,122,.35); background: rgba(76,175,122,.06); }
.addr-ip {
    font-family: var(--font-mono);
    font-size: .82rem;
    color: var(--color-text);
    flex: 1;
    min-width: 0;
    word-break: break-all;
}
.addr-label {
    font-size: .72rem;
    font-weight: 600;
    color: var(--color-text-muted);
    white-space: nowrap;
    flex-shrink: 0;
}
.addr-item.addr-ipv6 .addr-label { color: var(--color-primary); }
.ipv6-local-none {
    font-size: .85rem;
    color: var(--color-text-muted);
    font-style: italic;
    margin-bottom: .5rem;
}
.ipv6-local-note {
    font-size: .78rem;
    color: var(--color-text-muted);
    margin-top: .5rem;
    background: var(--color-bg);
    padding: .5rem .75rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
}

/* Rerun + privacy */
.ipv6-rerun {
    padding: 1rem 1.75rem 1.5rem;
    border-top: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}
.ipv6-privacy-note {
    font-size: .75rem;
    color: var(--color-text-muted);
    margin: 0;
    flex: 1;
}

/* Responsive */
@media (max-width: 520px) {
    .ipv6-info-grid { grid-template-columns: 1fr; }
    .ipv6-widget-head,
    .ipv6-idle,
    .ipv6-loading,
    .ipv6-error,
    .ipv6-status-banner,
    .ipv6-info-card,
    .ipv6-local,
    .ipv6-rerun { padding-left: 1.1rem; padding-right: 1.1rem; }
    .btn-check { font-size: .95rem; padding: .7rem 1.5rem; }
}