/* venkatsadras.com — one stylesheet, same visual language as the Rahat architecture pages. */
:root {
  --bg: #eef1f7; --panel: #ffffff; --fg: #131925; --muted: #586377; --line: #c6cedb; --line-soft: #e1e6ee;
  --model: #c0640a; --model-bg: #fff0dc;
  --code: #1d55b3; --code-bg: #e5edfc;
  --judge: #6a3ea6; --judge-bg: #f0e8fb;
  --store: #1b7856; --store-bg: #dff3ea;
  --plane: #a3243c; --plane-bg: #fbe6ea;
  --pulse: #0092c4;
  --shadow: rgba(16, 24, 40, 0.12);
  --display: "Archivo", "Helvetica Neue", Arial, sans-serif;
  --body: "Source Sans 3", "Segoe UI", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --radius: 14px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d121a; --panel: #141b26; --fg: #e7ecf4; --muted: #9aa6b8; --line: #2a3546; --line-soft: #1d2634;
    --model: #f3a64c; --model-bg: #2b2014;
    --code: #80abf3; --code-bg: #13233a;
    --judge: #bc99ee; --judge-bg: #251a37;
    --store: #5fca9e; --store-bg: #10281e;
    --plane: #f1879a; --plane-bg: #32181e;
    --pulse: #50d4f6;
    --shadow: rgba(0, 0, 0, 0.45);
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--fg); font-family: var(--body); font-size: 18px; line-height: 1.55; }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--code); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--pulse); outline-offset: 3px; border-radius: 6px; }

.wrap { max-width: 1080px; margin: 0 auto; padding: 0 20px; }
.narrow { max-width: 720px; }

/* Skip link */
.skip { position: absolute; left: -999px; top: 8px; background: var(--panel); padding: 8px 12px; border-radius: 8px; z-index: 10; }
.skip:focus { left: 12px; }

/* Header */
.site-header { position: sticky; top: 0; z-index: 5; background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); border-bottom: 1px solid var(--line-soft); }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 62px; }
.brand { font-family: var(--display); font-weight: 800; font-size: 19px; letter-spacing: -0.01em; color: var(--fg); text-decoration: none; white-space: nowrap; }
.nav { display: flex; align-items: center; gap: 4px; }
.nav a { font-family: var(--display); font-weight: 600; font-size: 15px; color: var(--fg); text-decoration: none; padding: 8px 10px; border-radius: 8px; }
.nav a:hover { background: var(--line-soft); }
.nav a[aria-current="page"] { color: var(--code); }
.nav .btn { margin-left: 6px; }
.menu-toggle { display: none; background: none; border: 1px solid var(--line); color: var(--fg); border-radius: 8px; padding: 7px 11px; font: 600 15px var(--display); }
@media (max-width: 720px) {
  .menu-toggle { display: inline-block; }
  .nav { display: none; position: absolute; left: 0; right: 0; top: 62px; flex-direction: column; align-items: stretch; gap: 0; padding: 8px 16px 16px; background: var(--bg); border-bottom: 1px solid var(--line); }
  .nav.open { display: flex; }
  .nav a { padding: 12px 8px; font-size: 17px; }
  .nav .btn { margin: 8px 0 0; text-align: center; }
}

/* Buttons */
.btn { display: inline-block; font-family: var(--display); font-weight: 700; font-size: 15px; text-decoration: none; padding: 10px 16px; border-radius: 10px; border: 1px solid transparent; }
.btn-primary { background: var(--fg); color: var(--bg) !important; }
.btn-primary:hover { opacity: 0.9; background: var(--fg); }
.btn-ghost { background: var(--panel); color: var(--fg) !important; border-color: var(--line); }
.btn-ghost:hover { border-color: var(--muted); background: var(--panel) !important; }
.actions { display: flex; flex-wrap: wrap; gap: 10px; margin: 22px 0 0; }

/* Type */
.eyebrow { font-family: var(--mono); font-size: 12.5px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); margin: 0 0 10px; }
h1 { font-family: var(--display); font-weight: 800; font-size: clamp(34px, 5.6vw, 58px); line-height: 1.02; letter-spacing: -0.024em; margin: 0 0 16px; text-wrap: balance; }
h2 { font-family: var(--display); font-weight: 800; font-size: clamp(24px, 3vw, 32px); line-height: 1.12; letter-spacing: -0.015em; margin: 0 0 10px; text-wrap: balance; }
h3 { font-family: var(--display); font-weight: 700; font-size: 19px; line-height: 1.25; margin: 0 0 6px; text-wrap: balance; }
.lede { font-size: clamp(18px, 2vw, 21px); color: var(--muted); max-width: 680px; margin: 0; }
.lede strong { color: var(--fg); font-weight: 600; }
p { margin: 0 0 14px; }
.muted { color: var(--muted); }
.small { font-size: 15px; }
code { font-family: var(--mono); font-size: 0.86em; background: var(--line-soft); padding: 1px 5px; border-radius: 4px; }

section { padding: 56px 0; }
.hero { padding: 64px 0 28px; }
.section-head { margin-bottom: 22px; }
.section-head p { color: var(--muted); max-width: 640px; }

/* Figure: the moving map */
.figure { margin: 36px 0 0; background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 10px; box-shadow: 0 12px 32px -18px var(--shadow); }
.figure a { display: block; border-radius: 9px; overflow: hidden; }
.figure img { width: 100%; }
.figure figcaption { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 6px 16px; font-size: 15px; color: var(--muted); padding: 10px 6px 2px; }
.figure figcaption a { display: inline; border-radius: 0; font-weight: 600; }

/* Proof strip */
.proof { display: flex; flex-wrap: wrap; gap: 8px; margin: 22px 0 0; padding: 0; list-style: none; }
.proof li { font-family: var(--mono); font-size: 13.5px; padding: 7px 12px; border-radius: 9px; background: var(--panel); border: 1px solid var(--line); color: var(--muted); }
.proof b { font-family: var(--display); font-weight: 800; font-size: 17px; color: var(--fg); margin-right: 5px; font-variant-numeric: tabular-nums; }
.asof { font-family: var(--mono); font-size: 12px; color: var(--muted); margin: 10px 0 0; }

/* Cards */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
@media (max-width: 860px) { .cards { grid-template-columns: 1fr; } }
.card { position: relative; display: flex; flex-direction: column; background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px 22px 20px; text-decoration: none; color: var(--fg); transition: transform .15s ease, box-shadow .15s ease, border-color .15s ease; }
.card::before { content: ""; position: absolute; left: 0; right: 0; top: 0; height: 4px; border-radius: var(--radius) var(--radius) 0 0; background: var(--c, var(--code)); }
a.card:hover { transform: translateY(-2px); box-shadow: 0 14px 30px -18px var(--shadow); border-color: var(--c, var(--code)); }
.card .tag { align-self: flex-start; font-family: var(--mono); font-size: 11.5px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--c, var(--code)); background: var(--cb, var(--code-bg)); padding: 3px 8px; border-radius: 6px; margin-bottom: 12px; }
.card p { color: var(--muted); font-size: 16.5px; margin: 0 0 14px; }
.card .eyebrow { font-size: 12.5px; color: var(--muted); margin: 0 0 10px; }
.card .go { margin-top: auto; font-family: var(--display); font-weight: 700; font-size: 15px; color: var(--c, var(--code)); }

/* Two-up */
.two { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 860px) { .two { grid-template-columns: 1fr; } }

/* Quote band */
.band { background: var(--panel); border-top: 1px solid var(--line-soft); border-bottom: 1px solid var(--line-soft); }
.pull { font-family: var(--display); font-weight: 800; font-size: clamp(24px, 3.4vw, 36px); line-height: 1.15; letter-spacing: -0.015em; margin: 0 0 14px; text-wrap: balance; }
.pull em { font-style: normal; color: var(--store); }

/* Lists (writing, demos) */
.toolbar { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin: 0 0 18px; }
.search { flex: 1 1 260px; font: 17px var(--body); color: var(--fg); background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 11px 14px; }
.search::placeholder { color: var(--muted); }
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip { font: 600 14px var(--display); color: var(--fg); background: var(--panel); border: 1px solid var(--line); border-radius: 999px; padding: 7px 13px; cursor: pointer; }
.chip[aria-pressed="true"] { background: var(--fg); color: var(--bg); border-color: var(--fg); }
.list { list-style: none; margin: 0; padding: 0; display: grid; gap: 12px; }
.item { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 20px; }
.item a.title { font-family: var(--display); font-weight: 700; font-size: 20px; line-height: 1.25; color: var(--fg); text-decoration: none; }
.item a.title:hover { color: var(--code); }
.item .meta { font-family: var(--mono); font-size: 12.5px; color: var(--muted); margin: 0 0 6px; }
.item p { color: var(--muted); font-size: 16.5px; margin: 6px 0 0; }
.empty { background: var(--panel); border: 1px dashed var(--line); border-radius: var(--radius); padding: 22px; color: var(--muted); }
.empty strong { color: var(--fg); }

/* Series / roadmap */
.steps { list-style: none; margin: 0; padding: 0; counter-reset: s; display: grid; gap: 8px; }
.steps li { counter-increment: s; display: grid; grid-template-columns: 40px 1fr; gap: 12px; align-items: baseline; background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 12px 16px; }
.steps li::before { content: counter(s, decimal-leading-zero); font-family: var(--mono); font-size: 13px; color: var(--muted); }
.steps li.live { border-color: var(--store); }
.steps .st { font-family: var(--mono); font-size: 12px; color: var(--muted); display: block; }
.steps li.live .st { color: var(--store); }

/* Demo */
.demo { display: grid; grid-template-columns: 1.4fr 1fr; gap: 22px; align-items: start; background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px; }
@media (max-width: 860px) { .demo { grid-template-columns: 1fr; } }
.demo .media { border-radius: 10px; overflow: hidden; border: 1px solid var(--line-soft); }
.demo .body { padding: 8px 8px 8px 0; }
@media (max-width: 860px) { .demo .body { padding: 0 6px 6px; } }
.kv { margin: 12px 0 0; padding: 0; list-style: none; display: grid; gap: 8px; font-size: 16px; }
.kv b { font-family: var(--display); }
.badge { display: inline-block; font-family: var(--mono); font-size: 11.5px; letter-spacing: 0.05em; text-transform: uppercase; padding: 3px 8px; border-radius: 6px; }
.badge.shipped { color: var(--store); background: var(--store-bg); }
.badge.notyet { color: var(--model); background: var(--model-bg); }

/* Prose */
.prose h2 { margin-top: 44px; }
.prose ul { padding-left: 22px; margin: 0 0 16px; }
.prose li { margin: 0 0 8px; }
.prose li strong { font-family: var(--display); font-weight: 700; }

/* Subscribe */
.subscribe { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 16px 28px; background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px; }
.subscribe h2 { margin: 0 0 4px; font-size: 24px; }
.subscribe p { margin: 0; color: var(--muted); }

/* Footer */
.site-footer { border-top: 1px solid var(--line-soft); padding: 28px 0 44px; color: var(--muted); font-size: 15px; }
.site-footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px 24px; }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 6px 18px; }
.site-footer a { color: var(--muted); }
.site-footer a:hover { color: var(--fg); }

@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }