/* john.engineering — system design language
   Type: San Francisco via -apple-system, with graceful fallbacks.
   Color: neutral greys + a single accent. Nothing else. */

:root {
  --bg:            #ffffff;
  --bg-alt:        #f5f5f7;
  --bg-elevated:   #ffffff;
  --bg-vibrant:    rgba(255,255,255,0.72);
  --text:          #1d1d1f;
  --text-2:        #6e6e73;
  --text-3:        #86868b;
  --line:          rgba(0,0,0,0.10);
  --line-strong:   rgba(0,0,0,0.18);
  --accent:        #0071e3;
  --accent-press:  #0077ed;
  --accent-soft:   rgba(0,113,227,0.10);
  --green:         #1d8f4e;
  --amber:         #b25000;
  --shadow-sm:     0 1px 2px rgba(0,0,0,.04), 0 4px 14px rgba(0,0,0,.05);
  --shadow-lg:     0 2px 6px rgba(0,0,0,.04), 0 18px 48px rgba(0,0,0,.10);
  --r-sm:  10px;
  --r-md:  14px;
  --r-lg:  20px;
  --r-xl:  28px;
  --page:  980px;
  --wide:  1220px;
  --nav-h: 48px;
  --ease:  cubic-bezier(.28,.11,.32,1);
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg:          #000000;
    --bg-alt:      #0a0a0b;
    --bg-elevated: #1d1d1f;
    --bg-vibrant:  rgba(22,22,23,0.72);
    --text:        #f5f5f7;
    --text-2:      #a1a1a6;
    --text-3:      #86868b;
    --line:        rgba(255,255,255,0.12);
    --line-strong: rgba(255,255,255,0.22);
    --accent:      #2997ff;
    --accent-press:#3aa0ff;
    --accent-soft: rgba(41,151,255,0.14);
    --green:       #30d158;
    --amber:       #ff9f0a;
    --shadow-sm:   0 1px 2px rgba(0,0,0,.5);
    --shadow-lg:   0 20px 60px rgba(0,0,0,.6);
  }
}
:root[data-theme="dark"] {
  --bg:#000; --bg-alt:#0a0a0b; --bg-elevated:#1d1d1f; --bg-vibrant:rgba(22,22,23,.72);
  --text:#f5f5f7; --text-2:#a1a1a6; --text-3:#86868b;
  --line:rgba(255,255,255,.12); --line-strong:rgba(255,255,255,.22);
  --accent:#2997ff; --accent-press:#3aa0ff; --accent-soft:rgba(41,151,255,.14);
  --green:#30d158; --amber:#ff9f0a;
  --shadow-sm:0 1px 2px rgba(0,0,0,.5); --shadow-lg:0 20px 60px rgba(0,0,0,.6);
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text",
               "Helvetica Neue", Helvetica, Inter, system-ui, sans-serif;
  font-size: 17px;
  line-height: 1.47059;
  letter-spacing: -0.022em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

code, kbd, pre, .mono {
  font-family: "SF Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.88em;
  letter-spacing: 0;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

::selection { background: var(--accent-soft); }

.wrap { max-width: var(--page); margin: 0 auto; padding: 0 22px; }
.wrap-wide { max-width: var(--wide); margin: 0 auto; padding: 0 22px; }

/* ---------- Nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 9000;
  height: var(--nav-h);
  background: var(--bg-vibrant);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid transparent;
  transition: border-color .3s var(--ease);
}
.nav.is-scrolled { border-bottom-color: var(--line); }
.nav-inner {
  max-width: var(--wide); margin: 0 auto; padding: 0 22px;
  height: 100%; display: flex; align-items: center; gap: 28px;
}
.nav-mark {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 15px; font-weight: 600; letter-spacing: -.01em; color: var(--text);
}
.nav-mark:hover { text-decoration: none; opacity: .75; }
.nav-mark svg { display: block; }
.nav-links { display: flex; gap: 26px; margin-left: auto; align-items: center; }
.nav-links a {
  font-size: 12px; color: var(--text); opacity: .85;
  letter-spacing: -.01em; transition: opacity .2s var(--ease);
}
.nav-links a:hover { opacity: 1; text-decoration: none; }
.nav-links a.lock::before { content: "􀎠"; }
@media (max-width: 720px) { .nav-links { gap: 16px; } .nav-links .opt { display: none; } }

/* ---------- Type scale ---------- */
.eyebrow {
  font-size: 12px; font-weight: 600; letter-spacing: .012em;
  text-transform: uppercase; color: var(--text-3); margin: 0 0 14px;
}
h1.hero-title {
  font-size: clamp(40px, 7.4vw, 80px);
  line-height: 1.05; font-weight: 700; letter-spacing: -0.015em;
  margin: 0 0 18px;
}
h2.section-title {
  font-size: clamp(30px, 4.6vw, 48px);
  line-height: 1.08; font-weight: 700; letter-spacing: -0.015em; margin: 0 0 16px;
}
h3 { font-size: 21px; line-height: 1.19; font-weight: 600; letter-spacing: -.01em; margin: 0 0 8px; }
.lede { font-size: clamp(18px, 2.2vw, 23px); line-height: 1.42; color: var(--text-2); letter-spacing: -.01em; margin: 0 auto; max-width: 620px; }
.muted { color: var(--text-2); }
.small { font-size: 13px; line-height: 1.5; color: var(--text-3); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 7px;
  min-height: 40px; padding: 0 20px; border-radius: 980px;
  background: var(--accent); color: #fff; font-size: 15px; font-weight: 400;
  border: 1px solid transparent; cursor: pointer;
  transition: background .2s var(--ease), transform .2s var(--ease);
}
.btn:hover { background: var(--accent-press); text-decoration: none; }
.btn:active { transform: scale(.975); }
.btn-secondary { background: transparent; color: var(--accent); border-color: var(--line-strong); }
.btn-secondary:hover { background: var(--accent-soft); border-color: var(--accent); }
.btn-ghost { background: transparent; color: var(--accent); border-color: transparent; padding: 0 6px; }
.btn-ghost:hover { background: transparent; text-decoration: underline; }
.btn-row { display: flex; gap: 12px; flex-wrap: wrap; justify-content: center; }
.link-arrow::after { content: " ›"; }

/* ---------- Sections ---------- */
section { padding: 96px 0; }
section.tight { padding: 68px 0; }
section.alt { background: var(--bg-alt); }
.center { text-align: center; }
.section-head { max-width: 700px; margin: 0 auto 52px; text-align: center; }

/* ---------- Hero ---------- */
.hero { padding: 84px 0 64px; text-align: center; }
.hero .lede { margin-bottom: 30px; }
.hero-meta { margin-top: 34px; display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }
.chip {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 12px; color: var(--text-2);
  padding: 5px 12px; border: 1px solid var(--line); border-radius: 980px;
  background: var(--bg-elevated);
}
.chip .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--green); }

/* ---------- Browser mock ---------- */
.mock {
  max-width: 760px; margin: 52px auto 0;
  border: 1px solid var(--line); border-radius: var(--r-lg);
  background: var(--bg-elevated); box-shadow: var(--shadow-lg); overflow: hidden;
  text-align: left;
}
.mock-bar {
  display: flex; align-items: center; gap: 8px; padding: 11px 14px;
  border-bottom: 1px solid var(--line); background: var(--bg-alt);
}
.mock-dots { display: flex; gap: 6px; }
.mock-dots i { width: 11px; height: 11px; border-radius: 50%; display: block; }
.mock-dots i:nth-child(1) { background: #ff5f57; }
.mock-dots i:nth-child(2) { background: #febc2e; }
.mock-dots i:nth-child(3) { background: #28c840; }
.mock-url {
  flex: 1; margin-left: 8px; background: var(--bg); border: 1px solid var(--line);
  border-radius: 8px; padding: 6px 12px; min-height: 30px;
  display: flex; align-items: center; gap: 7px;
  font-size: 13px; color: var(--text-2); overflow: hidden; white-space: nowrap;
}
.mock-url .host { color: var(--text-3); }
.mock-url .path { color: var(--text); }
.mock-url .caret {
  width: 1.5px; height: 15px; background: var(--accent); display: inline-block;
  animation: blink 1.06s steps(1) infinite;
}
@keyframes blink { 0%,49%{opacity:1} 50%,100%{opacity:0} }
.mock-body { padding: 26px 24px 30px; min-height: 132px; }
.mock-row { display: flex; align-items: center; gap: 12px; font-size: 14px; }
.mock-row + .mock-row { margin-top: 14px; }
.mock-badge {
  font-size: 10.5px; font-weight: 600; letter-spacing: .04em; text-transform: uppercase;
  padding: 3px 8px; border-radius: 5px; background: var(--accent-soft); color: var(--accent);
  white-space: nowrap;
}
.mock-target { color: var(--text-2); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* ---------- Command bar ---------- */
.cmd {
  max-width: 660px; margin: 0 auto;
  border: 1px solid var(--line-strong); border-radius: var(--r-md);
  background: var(--bg-elevated); box-shadow: var(--shadow-sm);
  transition: border-color .2s var(--ease), box-shadow .2s var(--ease);
}
.cmd:focus-within { border-color: var(--accent); box-shadow: 0 0 0 4px var(--accent-soft); }
.cmd-field { display: flex; align-items: center; gap: 10px; padding: 13px 16px; }
.cmd-field .prefix { color: var(--text-3); font-size: 14px; white-space: nowrap; }
.cmd input {
  flex: 1; border: 0; outline: 0; background: transparent; color: var(--text);
  font: inherit; font-size: 16px; padding: 0; min-width: 0;
}
.cmd input::placeholder { color: var(--text-3); }
.cmd kbd {
  border: 1px solid var(--line); border-radius: 6px; padding: 2px 7px;
  font-size: 11px; color: var(--text-3); background: var(--bg-alt);
}
.cmd-result { border-top: 1px solid var(--line); padding: 12px 16px; display: none; }
.cmd-result.on { display: block; }
.cmd-hit { display: flex; align-items: center; gap: 10px; font-size: 13.5px; padding: 6px 0; }
.cmd-hit .arrow { color: var(--text-3); }
.cmd-hit .to { color: var(--text-2); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.cmd-hint { font-size: 12.5px; color: var(--text-3); text-align: center; margin-top: 14px; }

/* ---------- Cards / grid ---------- */
.grid { display: grid; gap: 20px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 900px) { .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 620px) { .grid-3, .grid-2, .grid-4 { grid-template-columns: 1fr; } }

.card {
  background: var(--bg-elevated); border: 1px solid var(--line);
  border-radius: var(--r-lg); padding: 26px 24px;
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s var(--ease);
}
.card.hoverable:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); border-color: var(--line-strong); }
.card .glyph {
  width: 40px; height: 40px; border-radius: 11px; display: grid; place-items: center;
  background: var(--accent-soft); color: var(--accent); margin-bottom: 16px;
}
.card p { color: var(--text-2); font-size: 15px; margin: 0 0 14px; line-height: 1.45; }
.card .routes { margin: 0; padding: 0; list-style: none; }
.card .routes li { font-size: 12.5px; padding: 3px 0; border-top: 1px solid var(--line); }
.card .routes li:first-child { border-top: 0; }
.card .routes code { color: var(--text-2); }

/* ---------- Stats ---------- */
.stats { display: grid; grid-template-columns: repeat(4,1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--r-lg); overflow: hidden; }
.stats div { background: var(--bg-elevated); padding: 26px 18px; text-align: center; }
.stats .n { font-size: 34px; font-weight: 600; letter-spacing: -.02em; display: block; }
.stats .l { font-size: 12px; color: var(--text-3); margin-top: 4px; display: block; }
@media (max-width: 620px) { .stats { grid-template-columns: repeat(2,1fr); } }

/* ---------- Vault promo ---------- */
.vault-panel {
  background: #000; color: #f5f5f7; border-radius: var(--r-xl);
  padding: 64px 44px; text-align: center; position: relative; overflow: hidden;
  border: 1px solid rgba(255,255,255,.08);
}
.vault-panel::after {
  content: ""; position: absolute; inset: -40% -10% auto; height: 320px;
  background: radial-gradient(60% 100% at 50% 0%, rgba(41,151,255,.28), transparent 70%);
  pointer-events: none;
}
.vault-panel > * { position: relative; z-index: 1; }
.vault-panel h2 { color: #f5f5f7; }
.vault-panel .lede { color: #a1a1a6; }
.vault-lock {
  width: 62px; height: 62px; margin: 0 auto 22px; border-radius: 18px;
  background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.14);
  display: grid; place-items: center; color: #f5f5f7;
}
.spec-list { list-style: none; padding: 0; margin: 34px auto 0; max-width: 560px; text-align: left; }
.spec-list li {
  display: flex; justify-content: space-between; gap: 18px; align-items: baseline;
  padding: 11px 0; border-top: 1px solid rgba(255,255,255,.10); font-size: 14px;
}
.spec-list li span:first-child { color: #a1a1a6; }
.spec-list li span:last-child { text-align: right; }

/* ---------- Command directory ---------- */
.filter-bar { max-width: 520px; margin: 0 auto 34px; }
.dir-group { margin-bottom: 42px; }
.dir-group h3 { display: flex; align-items: baseline; gap: 10px; margin-bottom: 14px; }
.dir-group h3 .count { font-size: 12px; color: var(--text-3); font-weight: 400; }
.dir-table { border: 1px solid var(--line); border-radius: var(--r-md); overflow: hidden; background: var(--bg-elevated); }
.dir-row {
  display: grid; grid-template-columns: minmax(220px, 340px) 1fr auto;
  gap: 16px; align-items: center; padding: 12px 18px;
  border-top: 1px solid var(--line); font-size: 14px;
}
.dir-row:first-child { border-top: 0; }
.dir-row:hover { background: var(--bg-alt); }
.dir-row .route { color: var(--text); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.dir-row .route .param { color: var(--accent); }
.dir-row .desc { color: var(--text-2); font-size: 13.5px; }
.dir-row .go { font-size: 12.5px; white-space: nowrap; }
.dir-row .tag {
  font-size: 10.5px; text-transform: uppercase; letter-spacing: .04em; font-weight: 600;
  padding: 2px 7px; border-radius: 5px; background: var(--bg-alt); color: var(--text-3);
}
.dir-row .tag.local { background: rgba(29,143,78,.12); color: var(--green); }
@media (max-width: 760px) {
  .dir-row { grid-template-columns: 1fr; gap: 5px; }
  .dir-row .go { justify-self: start; }
}
.no-results { text-align: center; color: var(--text-3); padding: 40px 0; }

/* ---------- Footer ---------- */
footer {
  background: var(--bg-alt); border-top: 1px solid var(--line);
  padding: 44px 0 40px; font-size: 12px; color: var(--text-3);
}
.foot-cols { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; margin-bottom: 32px; }
@media (max-width: 700px) { .foot-cols { grid-template-columns: repeat(2,1fr); } }
.foot-cols h4 { font-size: 12px; color: var(--text); margin: 0 0 10px; font-weight: 600; }
.foot-cols ul { list-style: none; margin: 0; padding: 0; }
.foot-cols li { padding: 4px 0; }
.foot-cols a { color: var(--text-3); }
.foot-cols a:hover { color: var(--text); }
.foot-base { border-top: 1px solid var(--line); padding-top: 18px; display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }

/* ---------- Reveal ---------- */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .reveal { opacity:1; transform:none; transition:none; } }

/* ---------- Utility ---------- */
.hr { height: 1px; background: var(--line); border: 0; margin: 0; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; border-radius: 6px; }