:root {
    color-scheme: dark;
    --bg: #060606;
    --panel: #0f0f10;
    --panel-alt: #141417;
    --text-primary: #e6e6e6;
    --text-secondary: #a9adb5;
    --accent: #5ef2c9;
    --accent-muted: rgba(94, 242, 201, 0.16);
    --border: #1f1f24;
    --mono: 'IBM Plex Mono', 'Cascadia Code', 'Fira Code', 'Courier New', monospace;
    --serif: 'Iowan Old Style', 'Palatino Linotype', 'Book Antiqua', Georgia, serif;
    --sans: 'Inter', 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    --max-width: 1100px;
    --gutter: clamp(1.2rem, 1vw + 1rem, 2rem);
    --radius: 18px;
    --shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: radial-gradient(circle at top, rgba(94, 242, 201, 0.045), transparent 55%) var(--bg);
    background-color: var(--bg);
    color: var(--text-primary);
    font-family: var(--serif);
    font-size: clamp(1rem, 0.3vw + 1rem, 1.05rem);
    line-height: 1.75;
    letter-spacing: 0.01em;
    min-height: 100vh;
}

main {
    width: min(100%, var(--max-width));
    margin: 0 auto;
    padding: clamp(1.5rem, 3vw, 3.5rem) clamp(1.2rem, 4vw, 4rem) clamp(4rem, 6vw, 6rem);
}

a {
    color: var(--accent);
    text-decoration: none;
    transition: color 0.2s ease, text-shadow 0.2s ease;
}

a:hover,
a:focus {
    color: #b0ffe6;
    text-shadow: 0 0 12px rgba(94, 242, 201, 0.35);
}

.hero {
    display: grid;
    gap: clamp(1.5rem, 4vw, 3.5rem);
    margin-bottom: clamp(3rem, 6vw, 5rem);
    text-align: left;
}

.hero__meta {
    font-family: var(--mono);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.25rem;
    color: var(--accent);
}

.hero__title {
    font-family: var(--mono);
    font-size: clamp(2.5rem, 6vw, 3.5rem);
    letter-spacing: 0.35rem;
    text-transform: uppercase;
    margin: 0;
}

.hero__lede {
    font-family: var(--serif);
    font-size: clamp(1.05rem, 1.3vw + 1rem, 1.35rem);
    color: var(--text-secondary);
    max-width: 70ch;
}

.hero__grid {
    display: grid;
    gap: clamp(1rem, 2vw, 2rem);
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.hero__panel {
    padding: clamp(1.2rem, 2vw, 2rem);
    background: linear-gradient(160deg, rgba(20, 20, 23, 0.92), rgba(10, 10, 12, 0.85));
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.hero__panel h3 {
    font-family: var(--mono);
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.2rem;
    margin-bottom: 0.75rem;
}

.toc {
    margin-bottom: clamp(3rem, 5vw, 5.5rem);
}

.toc__title {
    font-family: var(--mono);
    font-size: 0.85rem;
    letter-spacing: 0.2rem;
    text-transform: uppercase;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.toc__list {
    display: grid;
    gap: 0.65rem;
    padding-left: 0;
    list-style: none;
}

.toc__list li {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
    padding: 0.85rem 1rem;
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 14px;
    transition: transform 0.2s ease, border-color 0.2s ease;
}

.toc__list li:hover {
    transform: translateY(-4px);
    border-color: rgba(94, 242, 201, 0.45);
}

.toc__list span {
    font-family: var(--mono);
    font-size: 0.78rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.12rem;
}

.toc__list strong {
    font-weight: 600;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: clamp(1.5rem, 3vw, 2.5rem);
}

.card {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    gap: 1.2rem;
    padding: clamp(1.4rem, 2vw, 2.1rem);
    background: linear-gradient(165deg, rgba(18, 18, 22, 0.92), rgba(10, 10, 12, 0.88));
    border-radius: var(--radius);
    border: 1px solid rgba(255, 255, 255, 0.045);
    box-shadow: var(--shadow);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: attr(data-topic);
    position: absolute;
    top: 1.2rem;
    right: 1.2rem;
    font-family: var(--mono);
    font-size: 0.7rem;
    color: rgba(94, 242, 201, 0.55);
    letter-spacing: 0.16rem;
}

.card h3 {
    font-family: var(--mono);
    font-size: 1rem;
    letter-spacing: 0.1rem;
    text-transform: uppercase;
    margin: 0;
}

.card p {
    margin: 0;
    color: var(--text-secondary);
}

.card ul {
    margin: 0;
    padding-left: 1.2rem;
    display: grid;
    gap: 0.35rem;
    font-family: var(--serif);
}

.card footer {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-family: var(--mono);
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.16rem;
}

.breadcrumbs {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    font-family: var(--mono);
    font-size: 0.78rem;
    letter-spacing: 0.18rem;
    text-transform: uppercase;
    margin-bottom: 2.5rem;
    color: var(--text-secondary);
}

.article {
    display: grid;
    gap: clamp(1.8rem, 3vw, 2.8rem);
    margin-bottom: clamp(3rem, 5vw, 6rem);
}

.article section {
    padding: clamp(1.4rem, 2vw, 2.3rem);
    background: var(--panel);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
}

.article h2 {
    font-family: var(--mono);
    font-size: clamp(1.1rem, 2vw, 1.4rem);
    text-transform: uppercase;
    letter-spacing: 0.24rem;
    margin-bottom: 1rem;
}

.article p,
.article li {
    color: var(--text-secondary);
}

.meta-grid {
    display: grid;
    gap: 0.6rem;
    font-family: var(--mono);
    font-size: 0.78rem;
    color: var(--text-secondary);
}

.meta-grid span {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
}

.tag-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
    margin-top: 1rem;
}

.tag-cloud span {
    padding: 0.3rem 0.6rem;
    border-radius: 999px;
    border: 1px solid rgba(94, 242, 201, 0.45);
    background: rgba(94, 242, 201, 0.08);
    font-family: var(--mono);
    font-size: 0.68rem;
    letter-spacing: 0.14rem;
    text-transform: uppercase;
}

footer {
    margin-top: clamp(3rem, 5vw, 5rem);
    font-family: var(--mono);
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.18rem;
    color: var(--text-secondary);
    text-align: center;
}

@media (max-width: 720px) {
    main {
        padding: clamp(1.2rem, 5vw, 2rem);
    }

    .hero__title {
        letter-spacing: 0.18rem;
    }

    .card::before {
        font-size: 0.62rem;
        letter-spacing: 0.14rem;
    }
}