/* ===== Base ===== */
*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
                 sans-serif;
    line-height: 1.5;
}

body {
    margin: 0;
    background-color: #020617;
    color: #e5e7eb;
}

/* Links */
a {
    color: #f97316;
    text-decoration: none;
}
a:hover,
a:focus-visible {
    text-decoration: underline;
}

/* Layout */
.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* ===== Header & Nav ===== */
.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(15, 23, 42, 0.98);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid #111827;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.6rem 0.5rem;
    gap: 1rem;
}

.logo {
    font-weight: 600;
    font-size: 1.15rem;
    color: #f97316;
}

/* Nav */
.main-nav {
    display: flex;
    gap: 0.7rem;
    align-items: center;
    flex-wrap: wrap;
}

.main-nav a {
    color: #e5e7eb;
    padding: 0.3rem 0.7rem;
    border-radius: 999px;
    font-size: 0.9rem;
}

.main-nav a[aria-current="page"] {
    background-color: #f97316;
    color: #020617;
}

/* Top links bar */
.top-links-bar {
    background: radial-gradient(circle at top left, #1f2937, #020617);
    border-top: 1px solid #111827;
    border-bottom: 1px solid #111827;
}

.top-links-inner {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.55rem 0;
    flex-wrap: wrap;
}

.top-links-label {
    font-size: 0.85rem;
    color: #9ca3af;
    white-space: nowrap;
}

.top-links-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
}

.top-link-btn {
    display: inline-flex;
    flex-direction: column;
    justify-content: center;
    min-width: 130px;
    padding: 0.4rem 0.75rem;
    border-radius: 999px;
    text-decoration: none;
    color: #f9fafb;
    background: #111827;
    border: 1px solid transparent;
    box-shadow: 0 0 0 1px rgba(15, 23, 42, 0.8);
    transition: transform 0.12s ease, box-shadow 0.12s ease, background 0.12s ease;
    font-size: 0.78rem;
    line-height: 1.2;
}

.top-link-main {
    font-weight: 600;
    font-size: 0.85rem;
}

.top-link-sub {
    opacity: 0.8;
}

/* Brand colors */
.top-link-btn.github {
    background: linear-gradient(135deg, #111827, #020617);
}

.top-link-btn.youtube {
    background: linear-gradient(135deg, #ef4444, #b91c1c);
}

.top-link-btn.kofi {
    background: linear-gradient(135deg, #0ea5e9, #0369a1);
}

.top-link-btn:hover,
.top-link-btn:focus-visible {
    transform: translateY(-1px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.3);
    text-decoration: none;
}

/* ===== Main content ===== */
.site-main {
    padding: 2.5rem 0 3rem;
}

/* Hero */
.hero .eyebrow {
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: #f97316;
    font-size: 0.8rem;
    margin-bottom: 0.4rem;
}

.hero h1 {
    font-size: clamp(2.1rem, 5vw, 3.1rem);
    margin: 0 0 0.6rem;
}

.hero .lead {
    max-width: 32rem;
    color: #9ca3af;
    margin: 0 0 1.5rem;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.hero-meta {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 0.75rem;
    margin-top: 0.5rem;
}

.hero-meta-item {
    border-radius: 0.75rem;
    padding: 0.6rem 0.8rem;
    border: 1px solid #111827;
    background: radial-gradient(circle at top left, #1f2937, #020617);
}

.hero-meta-label {
    display: block;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: #9ca3af;
    margin-bottom: 0.2rem;
}

.hero-meta-value {
    font-size: 0.9rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.55rem 1.2rem;
    border-radius: 999px;
    font-weight: 500;
    font-size: 0.95rem;
    border: 1px solid transparent;
}

.btn.primary {
    background: linear-gradient(135deg, #f97316, #fb923c);
    color: #111827;
}

.btn.ghost {
    border-color: #4b5563;
    color: #e5e7eb;
}

/* Sections */
.section {
    padding: 2.2rem 0;
}

.section-alt {
    background: #020617;
    border-top: 1px solid #111827;
    border-bottom: 1px solid #111827;
}

.section-header h2 {
    margin: 0 0 0.4rem;
    font-size: 1.4rem;
}

.section-header p {
    margin: 0;
    color: #9ca3af;
}

.section-footer {
    margin-top: 1rem;
}

/* Grids & cards */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    gap: 1rem;
    margin-top: 1.3rem;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
    gap: 1rem;
}

.card {
    padding: 1.1rem 1.1rem 1.3rem;
    border-radius: 0.9rem;
    background: radial-gradient(circle at top left, #1f2937, #020617);
    border: 1px solid #111827;
}

.card.compact {
    padding: 0.9rem 1rem 1rem;
}

.card h2,
.card h3 {
    margin: 0 0 0.4rem;
    font-size: 1.05rem;
}

.card p {
    margin: 0 0 0.5rem;
    color: #9ca3af;
}

.card-note {
    font-size: 0.85rem;
    color: #9ca3af;
}

.card-link {
    font-size: 0.9rem;
    color: #f97316;
}

/* Feature grid */
.feature-grid {
    display: grid;
    grid-template-columns: minmax(0, 2.2fr) minmax(0, 1fr);
    gap: 1.5rem;
    margin-top: 1.2rem;
}

.feature-main ul {
    padding-left: 1.1rem;
    margin: 0.5rem 0 1rem;
    color: #d1d5db;
    font-size: 0.93rem;
}

.feature-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.feature-aside {
    border-radius: 0.9rem;
    padding: 1rem 1.1rem;
    border: 1px solid #111827;
    background: #020617;
    font-size: 0.92rem;
}

/* Two-column layout */
.two-col {
    display: grid;
    grid-template-columns: minmax(0, 2fr) minmax(0, 1.3fr);
    gap: 1.5rem;
}

.about-preview h2 {
    margin-top: 0;
}

/* Page header */
.page-header h1 {
    margin: 0 0 0.4rem;
    font-size: 1.7rem;
}

.page-header p {
    margin: 0;
    color: #9ca3af;
}

/* Posts list */
.posts-list {
    display: grid;
    gap: 1rem;
    margin-top: 1.2rem;
}

.post-teaser {
    border-radius: 0.9rem;
    border: 1px solid #111827;
    padding: 0.9rem 1rem 1rem;
    background: #020617;
}

.post-teaser h3 {
    margin: 0.4rem 0 0.4rem;
    font-size: 1.05rem;
}

.post-teaser p {
    margin: 0;
    color: #9ca3af;
}

.post-meta {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    font-size: 0.8rem;
    color: #9ca3af;
}

.post-tag {
    padding: 0.1rem 0.5rem;
    border-radius: 999px;
    background: #111827;
    color: #f97316;
}

/* Blog nav */
.blog-nav {
    margin: 1rem 0 1.5rem;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    font-size: 0.9rem;
}

.blog-nav a {
    padding: 0.25rem 0.7rem;
    border-radius: 999px;
    border: 1px solid #374151;
}

/* Text utilities */
.text-link {
    color: #f97316;
    font-weight: 500;
}

/* Footer */
.site-footer {
    border-top: 1px solid #111827;
    padding: 1.2rem 0 1.8rem;
    font-size: 0.85rem;
    color: #6b7280;
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    gap: 0.5rem;
    align-items: center;
}

.footer-links {
    display: flex;
    gap: 0.8rem;
    flex-wrap: wrap;
}

.footer-links a {
    color: #9ca3af;
    font-size: 0.85rem;
}

/* IPv4 overlay banner */
.ipv4-banner.hidden {
    display: none;
}

.ipv4-banner {
    position: fixed;
    inset: 0;
    z-index: 9999;
    background: radial-gradient(circle at top, rgba(15, 23, 42, 0.98), rgba(0, 0, 0, 0.98));
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
}

.ipv4-banner-inner {
    max-width: 520px;
    width: 100%;
    background: #020617;
    border-radius: 1rem;
    border: 1px solid #f97316;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.75);
    padding: 1.6rem 1.6rem 1.4rem;
}

.ipv4-banner h2 {
    margin: 0 0 0.75rem;
    font-size: 1.3rem;
    color: #f97316;
}

.ipv4-banner p {
    margin: 0 0 0.6rem;
    color: #e5e7eb;
}

.ipv4-banner-list {
    margin: 0 0 0.6rem 1.1rem;
    padding: 0;
    color: #d1d5db;
    font-size: 0.93rem;
}

.ipv4-banner-list li {
    margin-bottom: 0.25rem;
}

.ipv4-banner-more {
    font-size: 0.85rem;
    color: #9ca3af;
    margin-bottom: 0.9rem;
}

.ipv4-banner-more a {
    color: #f97316;
}

.btn.ipv4-banner-close {
    background: linear-gradient(135deg, #f97316, #fb923c);
    color: #111827;
    border-radius: 999px;
    padding: 0.55rem 1.3rem;
    font-weight: 600;
    cursor: pointer;
    border: none;
}

/* ===== Responsive ===== */
@media (max-width: 640px) {
    .header-inner {
        flex-direction: column;
        align-items: flex-start;
        padding: 0.4rem 0.5rem;
    }

    .top-links-inner {
        flex-direction: column;
        align-items: flex-start;
    }

    .top-links-buttons {
        width: 100%;
        justify-content: flex-start;
    }

    .top-link-btn {
        flex: 1 1 auto;
    }

    .feature-grid {
        grid-template-columns: minmax(0, 1fr);
    }

    .two-col {
        grid-template-columns: minmax(0, 1fr);
    }

    .footer-inner {
        flex-direction: column;
        align-items: flex-start;
    }

    .ipv4-banner-inner {
        padding: 1.2rem 1rem 1.1rem;
    }

    .ipv4-banner h2 {
        font-size: 1.1rem;
    }
}