:root {
    --bg: #0f1116;
    --bg-elev: #161922;
    --surface: #1c2030;
    --card: #1f2333;
    --text: #e6e8ef;
    --text-dim: #b4b8c5;
    --muted: #7e8497;
    --border: rgba(255,255,255,0.08);
    --border-strong: rgba(255,255,255,0.16);
    --accent: #8b5cf6;
    --accent-2: #f472b6;
    --accent-soft: rgba(139,92,246,0.14);
    --warn: #fbbf24;
    --grid-line: rgba(255,255,255,0.04);

    --radius-sm: 6px;
    --radius: 10px;
    --radius-lg: 18px;

    --font-sans: 'Inter', ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    --font-display: 'Inter', system-ui, sans-serif;

    --space-xs: 6px;
    --space-sm: 10px;
    --space-md: clamp(16px, 3vw, 22px);
    --space-lg: clamp(28px, 5vw, 44px);
    --space-xl: clamp(40px, 7vw, 72px);

    --reading: 70ch;
    --container: 1180px;

    --shadow-sm: 0 1px 0 rgba(255,255,255,0.04) inset, 0 1px 2px rgba(0,0,0,0.4);
    --shadow-md: 0 12px 32px -16px rgba(0,0,0,0.6);

    --ease: cubic-bezier(.2,.7,.2,1);
}

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

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
    background:
        radial-gradient(1200px 600px at 90% -10%, rgba(139,92,246,0.10), transparent 60%),
        radial-gradient(900px 500px at -10% 20%, rgba(244,114,182,0.06), transparent 60%),
        linear-gradient(180deg, var(--bg), var(--bg) 100%);
    color: var(--text);
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.65;
    min-height: 100vh;
    overflow-x: hidden;
    font-weight: 400;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

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

a {
    color: var(--accent);
    text-decoration: none;
    transition: color .2s var(--ease), background .2s var(--ease);
}
a:hover { color: var(--accent-2); }
a:focus-visible,
button:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
    border-radius: 4px;
}

ul { list-style: none; }

h1, h2, h3, h4 {
    font-family: var(--font-display);
    font-weight: 600;
    letter-spacing: -0.015em;
    line-height: 1.25;
    color: var(--text);
    overflow-wrap: break-word;
    word-wrap: break-word;
    hyphens: auto;
}

::selection { background: var(--accent); color: #fff; }

/* HEADER */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(15,17,22,0.78);
    backdrop-filter: blur(14px) saturate(140%);
    -webkit-backdrop-filter: blur(14px) saturate(140%);
    border-bottom: 1px solid var(--border);
}

.header-inner {
    max-width: var(--container);
    margin: 0 auto;
    padding: 14px var(--space-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-md);
}

.logo-name {
    font-family: var(--font-mono);
    font-size: 0.92rem;
    font-weight: 600;
    color: var(--text);
    letter-spacing: -0.01em;
    position: relative;
    padding-left: 14px;
}
.logo-name::before {
    content: "";
    position: absolute;
    left: 0; top: 50%;
    width: 8px; height: 8px;
    border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 0 12px var(--accent);
    transform: translateY(-50%);
}

.main-nav {
    display: flex;
    gap: 22px;
    font-family: var(--font-mono);
    font-size: 0.78rem;
    letter-spacing: 0.02em;
    text-transform: lowercase;
}

.main-nav a {
    color: var(--text-dim);
    position: relative;
    padding: 6px 2px;
}
.main-nav a::before {
    content: "·";
    color: var(--accent);
    margin-right: 6px;
    opacity: 0;
    transition: opacity .2s var(--ease);
}
.main-nav a:hover { color: var(--text); }
.main-nav a:hover::before { opacity: 1; }

.lang-switcher {
    display: flex;
    gap: 4px;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    text-transform: uppercase;
}
.lang-switcher a {
    color: var(--muted);
    padding: 5px 9px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
}
.lang-switcher a.active,
.lang-switcher a:hover {
    color: var(--text);
    border-color: var(--accent);
    background: var(--accent-soft);
}

@media (max-width: 768px) {
    .main-nav { display: none; }
}

/* MAIN */
main {
    max-width: var(--container);
    margin: 0 auto;
    padding: var(--space-lg) var(--space-md) var(--space-xl);
}

/* HERO */
.hero {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-lg);
    margin-bottom: var(--space-xl);
    padding-top: var(--space-md);
    position: relative;
}

.hero::before {
    content: "";
    position: absolute;
    inset: -20px -20px auto -20px;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-strong), transparent);
    top: 0;
}

.hero-visual {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    aspect-ratio: 16/10;
    background: var(--surface);
    border: 1px solid var(--border);
}
.hero-visual::after {
    content: "";
    position: absolute; inset: 0;
    background: linear-gradient(180deg, transparent 50%, rgba(15,17,22,0.45));
    pointer-events: none;
}
.hero-visual img {
    width: 100%; height: 100%;
    object-fit: cover;
    object-position: center;
    transition: transform .8s var(--ease);
}
.hero-visual:hover img { transform: scale(1.02); }

.hero-content {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.hero-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--accent);
    padding: 5px 10px;
    background: var(--accent-soft);
    border: 1px solid rgba(139,92,246,0.3);
    border-radius: 999px;
    width: fit-content;
}
.hero-tag::before {
    content: "";
    width: 5px; height: 5px;
    border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 0 8px var(--accent);
}

.article-title {
    font-size: clamp(1.25rem, 2.4vw + 0.4rem, 1.95rem);
    font-weight: 600;
    line-height: 1.3;
    letter-spacing: -0.02em;
    color: var(--text);
    max-width: 28ch;
}

.lead {
    font-size: 1.02rem;
    color: var(--text-dim);
    line-height: 1.7;
    max-width: 60ch;
}

.meta-panel {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 18px;
    padding-top: 18px;
    margin-top: 6px;
    border-top: 1px dashed var(--border);
    font-family: var(--font-mono);
}

.meta-item {
    display: flex;
    flex-direction: column;
    gap: 2px;
}
.meta-item .label {
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: var(--muted);
}
.meta-item .value {
    font-size: 0.85rem;
    color: var(--text);
}

.meta-divider {
    width: 1px;
    height: 24px;
    background: var(--border);
}

@media (min-width: 900px) {
    .hero {
        grid-template-columns: 1.05fr 1fr;
        align-items: center;
    }
    .hero-visual { aspect-ratio: 4/5; order: 2; }
    .article-title { font-size: clamp(1.5rem, 1.6vw + 0.8rem, 2rem); }
}

/* CONTENT LAYOUT */
.content-wrapper {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-lg);
    margin-bottom: var(--space-xl);
    align-items: start;
}

@media (min-width: 1024px) {
    .content-wrapper {
        grid-template-columns: minmax(0, 1fr) 300px;
    }
}

/* ARTICLE BODY */
.content-body {
    max-width: var(--reading);
    font-size: 1rem;
}

.content-body p {
    margin-bottom: 1.4rem;
    color: var(--text-dim);
    line-height: 1.78;
    font-weight: 400;
}

.content-body p strong { color: var(--text); font-weight: 600; }

.content-body a {
    color: var(--accent-2);
    border-bottom: 1px solid rgba(244,114,182,0.35);
    padding-bottom: 1px;
}
.content-body a:hover {
    color: var(--text);
    border-color: var(--text);
}

.content-body h2 {
    font-size: clamp(1.15rem, 1vw + 0.7rem, 1.4rem);
    margin: 2.4rem 0 0.9rem;
    color: var(--text);
    position: relative;
    padding-left: 16px;
}
.content-body h2::before {
    content: "";
    position: absolute;
    left: 0; top: 0.45em;
    width: 4px; height: 0.8em;
    background: linear-gradient(180deg, var(--accent), var(--accent-2));
    border-radius: 2px;
}

.content-body h3 {
    font-size: clamp(1rem, 0.6vw + 0.8rem, 1.15rem);
    margin: 1.8rem 0 0.6rem;
    color: var(--text);
    font-weight: 600;
}

.content-body ul,
.content-body ol {
    margin: 0 0 1.5rem 0;
    padding-left: 1.2rem;
    color: var(--text-dim);
}
.content-body ul li,
.content-body ol li {
    margin-bottom: 0.5rem;
    line-height: 1.7;
}
.content-body ul li::marker { color: var(--accent); }

.content-body blockquote {
    margin: 2rem 0;
    padding: var(--space-md) var(--space-md) var(--space-md) calc(var(--space-md) + 14px);
    background: var(--surface);
    border: 1px solid var(--border);
    border-left: 3px solid var(--accent);
    border-radius: var(--radius);
    font-size: 1.05rem;
    font-style: italic;
    color: var(--text);
    line-height: 1.65;
    position: relative;
}
.content-body blockquote cite {
    display: block;
    margin-top: 12px;
    font-style: normal;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--muted);
    letter-spacing: 0.05em;
}

.content-body code {
    font-family: var(--font-mono);
    font-size: 0.88em;
    background: rgba(139,92,246,0.12);
    color: var(--accent-2);
    padding: 2px 6px;
    border-radius: 4px;
}
.content-body pre {
    background: #0a0c12;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: var(--space-md);
    overflow-x: auto;
    margin: 1.5rem 0;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    line-height: 1.6;
}
.content-body pre code { background: none; color: var(--text); padding: 0; }

.content-body table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
    font-size: 0.92rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}
.content-body th,
.content-body td {
    padding: 10px 14px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}
.content-body th {
    background: var(--surface);
    font-weight: 600;
    color: var(--text);
    font-family: var(--font-mono);
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}
.content-body td { color: var(--text-dim); }
.content-body tr:last-child td { border-bottom: none; }

/* INFO BOX */
.info-box {
    background: linear-gradient(180deg, var(--surface), var(--card));
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: var(--space-md);
    margin: 1.8rem 0;
    position: relative;
}
.info-box::before {
    content: "INFO";
    position: absolute;
    top: -10px; left: 16px;
    background: var(--bg);
    padding: 0 8px;
    font-family: var(--font-mono);
    font-size: 0.65rem;
    letter-spacing: 0.18em;
    color: var(--accent);
}
.info-box ul {
    display: flex;
    flex-direction: column;
    gap: 12px;
    padding: 0;
}
.info-box ul li {
    position: relative;
    padding-left: 22px;
    color: var(--text-dim);
    font-size: 0.95rem;
    line-height: 1.65;
}
.info-box ul li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--accent-2);
    font-family: var(--font-mono);
}
.info-box ul li strong { color: var(--text); font-weight: 600; }

/* SIDEBAR */
.author-sidebar {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}
@media (min-width: 1024px) {
    .author-sidebar {
        position: sticky;
        top: 84px;
    }
}

.author-card,
.toc-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}

.author-avatar {
    aspect-ratio: 5/4;
    overflow: hidden;
    background: var(--card);
    border-bottom: 1px solid var(--border);
}
.author-avatar img {
    width: 100%; height: 100%;
    object-fit: cover;
    object-position: top center;
    filter: saturate(0.9);
}

.author-info {
    padding: var(--space-md);
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.author-label {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.16em;
    color: var(--accent);
}

.author-name {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text);
}

.author-bio {
    font-size: 0.86rem;
    color: var(--text-dim);
    line-height: 1.6;
}

.author-socials {
    display: flex;
    gap: 8px;
    margin-top: 6px;
    padding-top: 12px;
    border-top: 1px dashed var(--border);
}
.author-socials a {
    width: 34px; height: 34px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    background: var(--card);
    border: 1px solid var(--border);
    color: var(--text-dim);
    transition: .2s var(--ease);
}
.author-socials a:hover {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
    transform: translateY(-1px);
}

.toc-card { padding: var(--space-md); }

.toc-title {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    text-transform: uppercase;
    letter-spacing: 0.18em;
    color: var(--muted);
    margin-bottom: 14px;
    display: flex;
    align-items: center;
    gap: 8px;
}
.toc-title::before {
    content: "";
    width: 18px; height: 1px;
    background: var(--accent);
}

.toc-list {
    counter-reset: toc;
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.toc-list li {
    counter-increment: toc;
    display: flex;
    gap: 10px;
    font-size: 0.88rem;
    line-height: 1.5;
    align-items: baseline;
}
.toc-list li::before {
    content: counter(toc, decimal-leading-zero);
    font-family: var(--font-mono);
    font-size: 0.68rem;
    color: var(--accent);
    min-width: 22px;
}
.toc-list li a {
    color: var(--text-dim);
    border-bottom: 1px solid transparent;
    padding-bottom: 1px;
}
.toc-list li a:hover {
    color: var(--text);
    border-color: var(--accent);
}

/* RELATED */
.related-section {
    margin-top: var(--space-xl);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--border);
}

.section-header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
}
.section-header h3 {
    font-size: clamp(1.05rem, 0.8vw + 0.7rem, 1.25rem);
    font-weight: 600;
    color: var(--text);
    white-space: nowrap;
    font-family: var(--font-mono);
    text-transform: lowercase;
    letter-spacing: -0.01em;
}
.section-header h3::before {
    content: "// ";
    color: var(--accent);
}

.decoder-line {
    flex: 1;
    height: 1px;
    background-image: linear-gradient(90deg, var(--border-strong) 50%, transparent 50%);
    background-size: 8px 1px;
}

.cards-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-md);
}
@media (min-width: 560px) {
    .cards-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1024px) {
    .cards-grid { grid-template-columns: repeat(3, 1fr); }
}

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: var(--space-md);
    display: flex;
    flex-direction: column;
    gap: 12px;
    cursor: pointer;
    transition: border-color .25s var(--ease), transform .25s var(--ease), background .25s var(--ease);
    position: relative;
    overflow: hidden;
}
.card::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, transparent 60%, var(--accent-soft));
    opacity: 0;
    transition: opacity .3s var(--ease);
    pointer-events: none;
}
.card:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
}
.card:hover::after { opacity: 1; }

.card-top {
    display: flex;
    align-items: center;
    gap: 8px;
}

.badge {
    font-family: var(--font-mono);
    font-size: 0.62rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    padding: 3px 8px;
    border-radius: 4px;
    background: var(--accent-soft);
    color: var(--accent);
    border: 1px solid rgba(139,92,246,0.3);
}
.badge.warning {
    background: rgba(251,191,36,0.1);
    color: var(--warn);
    border-color: rgba(251,191,36,0.3);
}

.card h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
    line-height: 1.35;
}

.card p {
    font-size: 0.86rem;
    color: var(--text-dim);
    line-height: 1.6;
    flex: 1;
}

.card-status {
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    padding-top: 10px;
    border-top: 1px dashed var(--border);
    margin-top: auto;
}

.status-dot {
    width: 6px; height: 6px;
    border-radius: 50%;
    background: var(--accent-2);
    box-shadow: 0 0 8px var(--accent-2);
    flex-shrink: 0;
}

/* FOOTER */
footer {
    margin-top: var(--space-xl);
    border-top: 1px solid var(--border);
    background: linear-gradient(180deg, transparent, rgba(0,0,0,0.25));
}

.footer-inner {
    max-width: var(--container);
    margin: 0 auto;
    padding: var(--space-lg) var(--space-md);
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md);
    justify-content: space-between;
    align-items: flex-start;
}

.footer-left {
    display: flex;
    flex-direction: column;
    gap: 4px;
}
.footer-left .brand {
    font-family: var(--font-mono);
    font-weight: 600;
    color: var(--text);
    font-size: 0.95rem;
}
.footer-left .copy {
    font-size: 0.78rem;
    color: var(--muted);
}

.footer-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 18px;
    font-family: var(--font-mono);
    font-size: 0.76rem;
    text-transform: lowercase;
}
.footer-nav a { color: var(--text-dim); }
.footer-nav a:hover { color: var(--accent); }

.footer-socials {
    display: flex;
    gap: 8px;
}
.footer-socials a {
    width: 34px; height: 34px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    color: var(--text-dim);
    transition: .2s var(--ease);
}
.footer-socials a:hover {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

.footer-bottom {
    max-width: var(--container);
    margin: 0 auto;
    padding: var(--space-md);
    border-top: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.footer-bottom p {
    font-family: var(--font-mono);
    font-size: 0.66rem;
    color: var(--muted);
    letter-spacing: 0.06em;
    line-height: 1.6;
    text-transform: uppercase;
    opacity: 0.7;
}

/* RESPONSIVE TWEAKS */
@media (max-width: 600px) {
    .footer-inner {
        flex-direction: column;
        align-items: flex-start;
    }
    .meta-divider { display: none; }
    .meta-panel { gap: 14px; }
}

@media (min-width: 480px) {
    body { font-size: 16px; }
}

@media (min-width: 768px) {
    .content-body { font-size: 1.02rem; }
}

@media (min-width: 1024px) {
    .article-title { font-size: clamp(1.5rem, 1.6vw + 0.7rem, 2rem); }
}

/* MOTION */
@media (prefers-reduced-motion: no-preference) {
    @keyframes fadeUp {
        from { opacity: 0; transform: translateY(12px); }
        to   { opacity: 1; transform: translateY(0); }
    }
    .hero-content { animation: fadeUp .6s var(--ease) both; animation-delay: .05s; }
    .hero-visual  { animation: fadeUp .6s var(--ease) both; }
    .content-body { animation: fadeUp .5s var(--ease) both; animation-delay: .15s; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: .001ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: .001ms !important;
        scroll-behavior: auto !important;
    }
}