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

:root {
    --bg: #0a0a0a;
    --bg-2: #111111;
    --bg-3: #1a1a1a;
    --border: #2a2a2a;
    --text: #e8e8e8;
    --text-muted: #888;
    --text-dim: #555;
    --accent: #ffffff;
    --accent-dim: #cccccc;
    --tag-bg: #1e1e1e;
    --link: #a0c4ff;
    --link-hover: #ffffff;
    --font-sans: 'Segoe UI', Arial, sans-serif;
    --font-mono: 'Courier New', monospace;
    --max-w: 1100px;
    --article-w: 780px;
}

html { scroll-behavior: smooth; }

body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.7;
    min-height: 100vh;
}

a {
    color: var(--link);
    text-decoration: none;
    transition: color 0.2s;
}

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

img { max-width: 100%; display: block; }

/* ─── NAV ─────────────────────────────────────────────── */

nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(10,10,10,0.92);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
}

.nav-inner {
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    gap: 32px;
    height: 56px;
}

.nav-logo {
    font-size: 1rem;
    font-weight: 700;
    color: var(--accent);
    letter-spacing: 0.05em;
    white-space: nowrap;
    text-decoration: none;
}

.nav-logo span { color: var(--text-muted); font-weight: 400; }

.nav-links {
    display: flex;
    gap: 4px;
    list-style: none;
    flex: 1;
}

.nav-links a {
    color: var(--text-muted);
    font-size: 0.875rem;
    padding: 6px 12px;
    border-radius: 6px;
    transition: color 0.2s, background 0.2s;
    text-decoration: none;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--accent);
    background: var(--bg-3);
}

.nav-search {
    margin-left: auto;
}

.nav-search-input {
    background: var(--bg-3);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text);
    font-size: 0.8rem;
    padding: 6px 12px;
    width: 180px;
    outline: none;
    transition: border-color 0.2s, width 0.3s;
}

.nav-search-input:focus {
    border-color: #444;
    width: 220px;
}

.nav-search-input::placeholder { color: var(--text-dim); }

/* ─── HERO ────────────────────────────────────────────── */

.hero {
    border-bottom: 1px solid var(--border);
    padding: 80px 24px 72px;
    text-align: center;
}

.hero-logo {
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: 0.2em;
    color: var(--text-muted);
    margin-bottom: 20px;
}

.hero h1 {
    font-size: clamp(2rem, 5vw, 3.2rem);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 16px;
    color: var(--accent);
}

.hero p {
    color: var(--text-muted);
    font-size: 1.05rem;
    max-width: 580px;
    margin: 0 auto 40px;
}

.search-bar {
    display: flex;
    max-width: 540px;
    margin: 0 auto;
    gap: 0;
}

.search-bar input {
    flex: 1;
    background: var(--bg-2);
    border: 1px solid var(--border);
    border-right: none;
    border-radius: 10px 0 0 10px;
    color: var(--text);
    font-size: 0.95rem;
    padding: 12px 18px;
    outline: none;
    transition: border-color 0.2s;
}

.search-bar input:focus { border-color: #444; }
.search-bar input::placeholder { color: var(--text-dim); }

.search-bar button {
    background: var(--accent);
    border: none;
    border-radius: 0 10px 10px 0;
    color: #000;
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 600;
    padding: 12px 22px;
    transition: background 0.2s;
}

.search-bar button:hover { background: #e0e0e0; }

/* ─── LAYOUT ──────────────────────────────────────────── */

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

.section {
    padding: 56px 0;
    border-bottom: 1px solid var(--border);
}

.section:last-child { border-bottom: none; }

.section-header {
    display: flex;
    align-items: baseline;
    gap: 16px;
    margin-bottom: 32px;
}

.section-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--accent);
    letter-spacing: 0.03em;
}

.section-link {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-left: auto;
}

.section-link:hover { color: var(--accent); }

/* ─── FEATURED ARTICLE ───────────────────────────────── */

.featured-article {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    background: var(--bg-2);
    border: 1px solid var(--border);
    border-radius: 14px;
    overflow: hidden;
}

.featured-article-body {
    padding: 40px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.featured-badge {
    display: inline-block;
    background: var(--bg-3);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-muted);
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    padding: 4px 10px;
    text-transform: uppercase;
    margin-bottom: 16px;
}

.featured-article h2 {
    font-size: 1.75rem;
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 12px;
    color: var(--accent);
}

.featured-article p {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 24px;
}

.featured-article-visual {
    background: var(--bg-3);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 280px;
}

.featured-visual-logo {
    font-size: 4rem;
    font-weight: 700;
    color: #222;
    letter-spacing: -0.02em;
    user-select: none;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 20px;
    border-radius: 8px;
    font-size: 0.875rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.2s;
    cursor: pointer;
}

.btn-primary {
    background: var(--accent);
    color: #000;
    border: none;
}

.btn-primary:hover {
    background: #e0e0e0;
    color: #000;
}

.btn-secondary {
    background: transparent;
    color: var(--text-muted);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    color: var(--accent);
    border-color: #444;
}

/* ─── ARTICLE GRID ───────────────────────────────────── */

.article-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.article-card {
    background: var(--bg-2);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px;
    transition: border-color 0.2s, transform 0.2s;
    text-decoration: none;
    display: block;
    color: inherit;
}

.article-card:hover {
    border-color: #3a3a3a;
    transform: translateY(-2px);
    color: inherit;
}

.article-card-meta {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
}

.tag {
    background: var(--tag-bg);
    border: 1px solid var(--border);
    border-radius: 5px;
    color: var(--text-muted);
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    padding: 3px 8px;
    text-transform: uppercase;
}

.article-date {
    color: var(--text-dim);
    font-size: 0.78rem;
}

.article-card h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--accent);
    margin-bottom: 8px;
    line-height: 1.4;
}

.article-card p {
    color: var(--text-muted);
    font-size: 0.875rem;
    line-height: 1.6;
}

/* ─── CATEGORIES ─────────────────────────────────────── */

.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 16px;
}

.category-card {
    background: var(--bg-2);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px 20px;
    text-decoration: none;
    color: inherit;
    transition: border-color 0.2s, background 0.2s;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.category-card:hover {
    border-color: #3a3a3a;
    background: var(--bg-3);
    color: inherit;
}

.category-icon {
    font-size: 1.5rem;
    margin-bottom: 4px;
}

.category-name {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--accent);
}

.category-count {
    color: var(--text-dim);
    font-size: 0.78rem;
}

/* ─── PRODUCTS GRID ──────────────────────────────────── */

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 20px;
}

.product-card {
    background: var(--bg-2);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 28px 24px;
    text-decoration: none;
    color: inherit;
    transition: border-color 0.2s, transform 0.2s;
    display: block;
}

.product-card:hover {
    border-color: #3a3a3a;
    transform: translateY(-2px);
    color: inherit;
}

.product-code {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--text-dim);
    letter-spacing: 0.08em;
    margin-bottom: 10px;
    text-transform: uppercase;
}

.product-name {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 8px;
}

.product-desc {
    color: var(--text-muted);
    font-size: 0.85rem;
    line-height: 1.6;
}

.product-status {
    display: inline-block;
    margin-top: 16px;
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--text-dim);
    padding: 3px 8px;
    border: 1px solid var(--border);
    border-radius: 4px;
}

/* ─── FOOTER ─────────────────────────────────────────── */

footer {
    border-top: 1px solid var(--border);
    padding: 48px 24px;
    margin-top: 0;
}

.footer-inner {
    max-width: var(--max-w);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
}

.footer-brand h3 {
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    margin-bottom: 8px;
    color: var(--accent);
}

.footer-brand p {
    color: var(--text-muted);
    font-size: 0.85rem;
    line-height: 1.6;
    max-width: 280px;
}

.footer-col h4 {
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-dim);
    margin-bottom: 14px;
}

.footer-col ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.footer-col a {
    color: var(--text-muted);
    font-size: 0.875rem;
    text-decoration: none;
    transition: color 0.2s;
}

.footer-col a:hover { color: var(--accent); }

.footer-bottom {
    max-width: var(--max-w);
    margin: 32px auto 0;
    padding-top: 24px;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
    color: var(--text-dim);
}

/* ─── ARTICLE PAGE ───────────────────────────────────── */

.article-header {
    padding: 60px 24px 48px;
    border-bottom: 1px solid var(--border);
    max-width: var(--article-w);
    margin: 0 auto;
}

.article-header .breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.8rem;
    color: var(--text-dim);
    margin-bottom: 24px;
}

.article-header .breadcrumb a {
    color: var(--text-muted);
    text-decoration: none;
}

.article-header .breadcrumb a:hover { color: var(--accent); }

.article-header h1 {
    font-size: clamp(1.6rem, 4vw, 2.4rem);
    font-weight: 700;
    line-height: 1.25;
    color: var(--accent);
    margin-bottom: 16px;
}

.article-header .article-subtitle {
    color: var(--text-muted);
    font-size: 1.05rem;
    line-height: 1.6;
    margin-bottom: 24px;
}

.article-meta-row {
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
}

.article-meta-row .tag { text-transform: uppercase; }

.article-meta-row .date {
    color: var(--text-dim);
    font-size: 0.8rem;
}

.article-meta-row .read-time {
    color: var(--text-dim);
    font-size: 0.8rem;
}

.article-body {
    max-width: var(--article-w);
    margin: 0 auto;
    padding: 48px 24px 80px;
}

.article-body h2 {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--accent);
    margin: 48px 0 16px;
    padding-top: 16px;
    border-top: 1px solid var(--border);
}

.article-body h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--accent-dim);
    margin: 28px 0 12px;
}

.article-body p {
    color: var(--text);
    margin-bottom: 20px;
    font-size: 0.975rem;
    line-height: 1.8;
}

.article-body ul,
.article-body ol {
    padding-left: 24px;
    margin-bottom: 20px;
}

.article-body li {
    color: var(--text);
    font-size: 0.975rem;
    line-height: 1.8;
    margin-bottom: 6px;
}

.article-body blockquote {
    border-left: 3px solid #333;
    margin: 28px 0;
    padding: 16px 24px;
    background: var(--bg-2);
    border-radius: 0 8px 8px 0;
    color: var(--text-muted);
    font-style: italic;
}

.article-body code {
    font-family: var(--font-mono);
    background: var(--bg-3);
    border: 1px solid var(--border);
    border-radius: 4px;
    font-size: 0.85em;
    padding: 2px 6px;
    color: #c9d1d9;
}

.article-body pre {
    background: var(--bg-2);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 20px 24px;
    margin: 24px 0;
    overflow-x: auto;
}

.article-body pre code {
    background: none;
    border: none;
    padding: 0;
    font-size: 0.875rem;
    line-height: 1.7;
}

.article-body hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 40px 0;
}

.article-body .callout {
    background: var(--bg-2);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 20px 24px;
    margin: 28px 0;
}

.article-body .callout p { margin: 0; }

.article-nav {
    display: flex;
    gap: 16px;
    justify-content: space-between;
    max-width: var(--article-w);
    margin: 0 auto;
    padding: 32px 24px 64px;
    border-top: 1px solid var(--border);
}

.article-nav a {
    color: var(--text-muted);
    font-size: 0.875rem;
    text-decoration: none;
    padding: 12px 18px;
    border: 1px solid var(--border);
    border-radius: 8px;
    transition: all 0.2s;
    max-width: 260px;
}

.article-nav a:hover {
    border-color: #444;
    color: var(--accent);
}

.article-nav a small {
    display: block;
    font-size: 0.72rem;
    color: var(--text-dim);
    margin-bottom: 4px;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

/* ─── STYLE GUIDE ─────────────────────────────────────── */

.table-of-contents {
    background: var(--bg-2);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 24px 28px;
    margin-bottom: 40px;
}

.table-of-contents h4 {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-dim);
    margin-bottom: 14px;
}

.table-of-contents ol {
    padding-left: 20px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.table-of-contents li a {
    color: var(--text-muted);
    font-size: 0.875rem;
    text-decoration: none;
}

.table-of-contents li a:hover { color: var(--accent); }

/* ─── RESPONSIVE ──────────────────────────────────────── */

/* ─── PAGE HEADER ────────────────────────────────────── */

.page-header {
    padding: 48px 24px 40px;
    border-bottom: 1px solid var(--border);
}

/* ─── COMING SOON ────────────────────────────────────── */

.coming-soon-page {}

.coming-soon-hero {
    text-align: center;
    padding: 72px 24px 64px;
    border-bottom: 1px solid var(--border);
}

.coming-soon-icon {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.coming-soon-badge {
    display: inline-block;
    background: var(--bg-3);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-muted);
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    padding: 4px 12px;
    text-transform: uppercase;
    margin-bottom: 20px;
}

.coming-soon-hero h1 {
    font-size: clamp(1.8rem, 4vw, 2.6rem);
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 16px;
}

.coming-soon-hero p {
    color: var(--text-muted);
    font-size: 1rem;
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.7;
}

.coming-soon-areas {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 20px;
    padding: 56px 0 0;
}

.coming-soon-area {
    background: var(--bg-2);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 28px 24px;
}

.coming-soon-area-icon {
    font-size: 1.5rem;
    margin-bottom: 12px;
}

.coming-soon-area h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--accent);
    margin-bottom: 8px;
}

.coming-soon-area p {
    color: var(--text-muted);
    font-size: 0.875rem;
    line-height: 1.6;
}

.coming-soon-note {
    background: var(--bg-2);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px 28px;
    margin: 32px 0 0;
}

.coming-soon-note-label {
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-dim);
    margin-bottom: 10px;
}

.coming-soon-note p {
    color: var(--text-muted);
    font-size: 0.9rem;
    line-height: 1.7;
    margin: 0;
}

.coming-soon-related {
    padding: 48px 0 80px;
}

/* ─── 404 ─────────────────────────────────────────────── */

.error-page {
    max-width: 680px;
    margin: 0 auto;
    padding: 80px 24px 80px;
    text-align: center;
}

.error-code {
    font-size: 6rem;
    font-weight: 700;
    color: var(--bg-3);
    line-height: 1;
    margin-bottom: 16px;
    letter-spacing: -0.04em;
}

.error-title {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 12px;
}

.error-message {
    color: var(--text-muted);
    font-size: 1rem;
    line-height: 1.7;
    max-width: 480px;
    margin: 0 auto;
}

.error-suggestions {
    margin-top: 48px;
    text-align: left;
}

.error-suggestions-label {
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-dim);
    margin-bottom: 16px;
    text-align: center;
}

.error-links {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.error-link {
    display: flex;
    align-items: center;
    gap: 14px;
    background: var(--bg-2);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 16px 18px;
    text-decoration: none;
    color: inherit;
    transition: border-color 0.2s, transform 0.2s;
}

.error-link:hover {
    border-color: #3a3a3a;
    transform: translateY(-1px);
    color: inherit;
}

.error-link-icon {
    font-size: 1.3rem;
    flex-shrink: 0;
}

.error-link-title {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--accent);
    margin-bottom: 2px;
}

.error-link-sub {
    font-size: 0.75rem;
    color: var(--text-dim);
}

@media (max-width: 480px) {
    .error-links { grid-template-columns: 1fr; }
    .error-code { font-size: 4rem; }
}

@media (max-width: 768px) {
    .featured-article {
        grid-template-columns: 1fr;
    }

    .featured-article-visual { min-height: 160px; }

    .footer-inner {
        grid-template-columns: 1fr 1fr;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 8px;
        text-align: center;
    }

    .nav-links { display: none; }

    .nav-search-input { width: 140px; }

    .article-nav { flex-direction: column; }
    .article-nav a { max-width: 100%; }
}

@media (max-width: 480px) {
    .footer-inner { grid-template-columns: 1fr; }
    .category-grid { grid-template-columns: 1fr 1fr; }
}