:root {
  --bg: #0a0f1a; --bg-2: #0e1524; --card: #111a2c; --card-2: #16213a; --line: #22304a;
  --text: #e8eef6; --muted: #8fa0ba; --green: #34d399; --blue: #38bdf8; --amber: #fbbf24;
  --head: "Space Grotesk", system-ui, sans-serif;
  --body: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, Consolas, monospace;
}
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #f6f8fb; --bg-2: #eef2f8; --card: #ffffff; --card-2: #f3f6fb; --line: #dbe3ee;
    --text: #0f1b2d; --muted: #52637c; --green: #059669; --blue: #0284c7; --amber: #b45309;
  }
}
:root[data-theme="light"] {
  --bg: #f6f8fb; --bg-2: #eef2f8; --card: #ffffff; --card-2: #f3f6fb; --line: #dbe3ee;
  --text: #0f1b2d; --muted: #52637c; --green: #059669; --blue: #0284c7; --amber: #b45309;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: var(--body); background: var(--bg); color: var(--text); line-height: 1.75; -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; }

nav { position: sticky; top: 0; z-index: 50; background: var(--bg); background: color-mix(in srgb, var(--bg) 82%, transparent); backdrop-filter: blur(14px); border-bottom: 1px solid var(--line); }
nav .in { max-width: 1140px; margin: 0 auto; padding: 0 24px; height: 64px; display: flex; align-items: center; justify-content: space-between; }
.brand { display: flex; align-items: center; gap: 10px; font-family: var(--head); font-weight: 700; font-size: 1.3rem; letter-spacing: -0.02em; }
.brand svg { width: 28px; height: 28px; }
.brand .word span { color: var(--green); }
.navr { display: flex; align-items: center; gap: 18px; color: var(--muted); font-size: 0.95rem; }
.navr a:hover { color: var(--text); }
.theme-btn { border: 1px solid var(--line); background: var(--card); color: var(--muted); border-radius: 999px; width: 36px; height: 36px; cursor: pointer; display: grid; place-items: center; }

article { max-width: 720px; margin: 0 auto; padding: 64px 24px 40px; }
.kicker { font-family: var(--mono); font-size: 0.8rem; letter-spacing: .08em; text-transform: uppercase; color: var(--green); }
h1 { font-family: var(--head); font-size: clamp(2rem, 5vw, 3rem); line-height: 1.1; letter-spacing: -0.03em; margin: 14px 0 16px; }
.dek { font-size: 1.2rem; color: var(--muted); line-height: 1.6; }
.byline { margin-top: 22px; padding-bottom: 28px; border-bottom: 1px solid var(--line); font-size: 0.88rem; color: var(--muted); font-family: var(--mono); }
article h2 { font-family: var(--head); font-size: 1.5rem; letter-spacing: -0.02em; margin: 44px 0 12px; }
article p { margin: 0 0 18px; font-size: 1.06rem; }
article ul, article ol { margin: 0 0 20px 1.3rem; font-size: 1.06rem; }
article li { margin-bottom: 8px; }
article strong { color: var(--text); }
article code { font-family: var(--mono); font-size: 0.88em; background: var(--card-2); border: 1px solid var(--line); padding: 1px 6px; border-radius: 6px; }
.callout { margin: 28px 0; padding: 20px 22px; border-radius: 14px; background: var(--card); border: 1px solid var(--line); border-left: 4px solid var(--green); }
.callout p:last-child { margin-bottom: 0; }
.callout.warn { border-left-color: var(--amber); }
.lesson { margin: 40px 0 10px; padding: 24px; border-radius: 16px; background: linear-gradient(135deg, color-mix(in srgb, var(--green) 12%, var(--card)), var(--card)); border: 1px solid color-mix(in srgb, var(--green) 35%, var(--line)); }
.lesson .kicker { display: block; margin-bottom: 6px; }
.lesson p { margin: 0; font-size: 1.1rem; }
.timeline { list-style: none; margin: 0 0 22px !important; border-left: 2px solid var(--line); padding-left: 20px; }
.timeline li { position: relative; margin-bottom: 14px; }
.timeline li::before { content: ""; position: absolute; left: -27px; top: 9px; width: 12px; height: 12px; border-radius: 50%; background: var(--bg); border: 2px solid var(--green); }
.timeline b { font-family: var(--mono); font-size: 0.85rem; color: var(--green); font-weight: 500; margin-right: 6px; }

.more { max-width: 720px; margin: 0 auto; padding: 0 24px 64px; display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.more a { display: block; padding: 18px 20px; border-radius: 14px; border: 1px solid var(--line); background: var(--card); transition: border-color .15s, transform .15s; }
.more a:hover { border-color: var(--green); transform: translateY(-2px); }
.more small { display: block; font-family: var(--mono); font-size: 0.75rem; color: var(--muted); margin-bottom: 4px; }
.more span { font-family: var(--head); font-weight: 600; }
.more a.next { text-align: right; }
@media (max-width: 600px) { .more { grid-template-columns: 1fr; } .more a.next { text-align: left; } }

footer { border-top: 1px solid var(--line); padding: 32px 24px 48px; color: var(--muted); font-size: 0.86rem; }
footer .in { max-width: 720px; margin: 0 auto; }