/* =========================================================
   NEW CODE — landing page styles
   industrial · minimal · terminal-adjacent (no glow, no CRT)
   ========================================================= */

:root {
  --orange: #FF6B00;
  --orange-dim: #DE5F00;
  --orange-deep: #8A3E00;
  --bg: #000000;
  --bg-1: #0A0C0D;
  --bg-2: #0E1114;
  --bg-3: #14181C;
  --line: #1E2328;
  --line-2: #2A2F36;
  --ink: #FFFFFF;
  --ink-2: #C9C7C4;
  --ink-3: #8A8199;
  --ink-4: #4A4951;
  --ink-5: #2A272E;
  --max: 1400px;
  --pad: clamp(20px, 3vw, 48px);
  --mono: 'Geist Mono', ui-monospace, 'SF Mono', 'JetBrains Mono', Menlo, monospace;
  --display: 'Space Grotesk', 'Geist Mono', ui-monospace, monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0; padding: 0;
  background: var(--bg);
  color: var(--ink-2);
  font-family: var(--mono);
  font-size: 15px;
  line-height: 1.55;
  font-feature-settings: "ss01", "zero", "calt";
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  overflow-x: hidden;
}

::selection { background: var(--orange); color: #000; }

a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }

/* ---------- global grid overlay ---------- */
.page {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--pad);
  position: relative;
}

.page::before,
.page::after {
  content: "";
  position: absolute;
  top: 0; bottom: 0;
  width: 1px;
  background: var(--line);
  pointer-events: none;
}
.page::before { left: var(--pad); }
.page::after { right: var(--pad); }

/* ---------- typography ---------- */
h1, h2, h3, h4 { margin: 0; font-weight: 500; letter-spacing: -0.01em; color: var(--ink); }
p { margin: 0; }

.mono { font-family: var(--mono); }
.display { font-family: var(--display); letter-spacing: -0.02em; font-weight: 500; }
.orange { color: var(--orange); }
.dim { color: var(--ink-3); }
.dimmer { color: var(--ink-4); }

.label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.label .tick { color: var(--orange); }

/* ---------- nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 40;
  background: rgba(0,0,0,0.82);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--pad);
  height: 56px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 24px;
}
.nav-brand { display: flex; align-items: center; gap: 12px; }
.nav-brand svg { height: 22px; width: auto; display: block; }
.nav-brand .wm {
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--ink);
}
.nav-brand .ver {
  font-family: var(--mono); font-size: 10px; letter-spacing: 0.14em;
  color: var(--orange);
  border: 1px solid var(--orange-deep); padding: 2px 6px;
}
.nav-links { display: flex; gap: 28px; justify-self: center; }
.nav-links a {
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--ink-3);
  display: inline-flex; align-items: center; gap: 6px;
}
.nav-links a:hover { color: var(--ink); }
.nav-links a::before { content: "·"; color: var(--ink-4); }
.nav-cta {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--bg); background: var(--orange);
  padding: 8px 14px; display: inline-flex; align-items: center; gap: 8px;
}
.nav-cta:hover { background: #fff; }
.nav-cta .arrow { font-family: var(--mono); }

@media (max-width: 840px) {
  .nav-links { display: none; }
  .nav-inner { grid-template-columns: auto auto; justify-content: space-between; }
}

/* ---------- section headers ---------- */
.section {
  position: relative;
  padding: 120px 20px;
  border-top: 1px solid var(--line);
}
.section:first-of-type { border-top: 0; }
.section-head {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 32px;
  margin-bottom: 56px;
}
.section-head .label { padding-top: 6px; display: flex; align-items: flex-start; gap: 8px; }
.section-head h2 {
  font-family: var(--display);
  font-size: clamp(32px, 4vw, 52px);
  line-height: 1.02;
  max-width: 18ch;
  color: var(--ink);
}
.section-head h2 em { font-style: normal; color: var(--orange); }
@media (max-width: 760px) {
  .section-head { grid-template-columns: 1fr; gap: 16px; }
  .section { padding: 80px 12px; }
}

/* ---------- HERO ---------- */
.hero {
  position: relative;
  padding: 80px 20px 120px;
  border-top: 0;
}
.hero-meta {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  margin-bottom: 56px;
}
.hero-meta > div {
  background: var(--bg);
  padding: 14px 16px;
  display: flex; flex-direction: column; gap: 4px;
}
.hero-meta .k { font-size: 10px; letter-spacing: 0.18em; text-transform: uppercase; color: var(--ink-4); }
.hero-meta .v { font-size: 12px; color: var(--ink); letter-spacing: 0.04em; }
.meta-sayhello {
  font-family: var(--mono); font-size: 10px; letter-spacing: 0.12em;
  color: var(--orange); text-decoration: none;
}
.meta-sayhello:hover { color: var(--ink); }
.hero-meta .v .dot { display: inline-block; width: 6px; height: 6px; background: var(--orange); margin-right: 8px; vertical-align: middle; }
@keyframes pulse { 0%, 40% { opacity: 1; } 50%, 100% { opacity: 0.15; } }
@media (max-width: 760px) {
  .hero-meta { grid-template-columns: repeat(2, 1fr); }
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  gap: 56px;
  align-items: start;
}
@media (max-width: 960px) { .hero-grid { grid-template-columns: 1fr; gap: 48px; } }

.hero h1 {
  font-family: var(--display);
  font-size: clamp(44px, 7.2vw, 104px);
  line-height: 0.94;
  letter-spacing: -0.035em;
  color: var(--ink);
  margin-bottom: 32px;
}
.hero h1 .line { display: block; }
.hero h1 .orange { color: var(--orange); }
.hero h1 .slash { color: var(--ink-4); font-weight: 300; }

.hero-sub {
  max-width: 52ch;
  color: var(--ink-2);
  font-size: 15px;
  margin-bottom: 40px;
}
.hero-sub .kw {
  color: var(--ink);
  background: var(--bg-2);
  padding: 1px 6px;
  border: 1px solid var(--line-2);
}
.hero-sub .kw-orange {
  color: var(--orange);
  background: transparent;
  border: 1px solid var(--orange-deep);
  padding: 1px 6px;
}

.hero-ctas { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 48px; }
.btn {
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.14em; text-transform: uppercase;
  padding: 14px 20px;
  display: inline-flex; align-items: center; gap: 12px;
  border: 1px solid transparent;
  transition: transform 120ms ease;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--orange); color: #000; }
.btn-primary:hover { background: #fff; }
.btn-ghost { border-color: var(--line-2); color: var(--ink); }
.btn-ghost:hover { border-color: var(--orange); color: var(--orange); }
.btn .dot { width: 8px; height: 8px; background: currentColor; }
.btn .carat { font-size: 14px; }

/* hero waveform pane */
.hero-pane {
  position: relative;
  aspect-ratio: 4 / 5;
  background: var(--bg-1);
  border: 1px solid var(--line);
  overflow: hidden;
}
.hero-pane .crosshatch {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(to right, var(--line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line) 1px, transparent 1px);
  background-size: 40px 40px;
  opacity: 0.5;
  pointer-events: none;
}
.hero-pane .corner {
  position: absolute;
  font-family: var(--mono); font-size: 9px; letter-spacing: 0.16em; color: var(--ink-4);
  text-transform: uppercase;
  padding: 10px 12px;
  pointer-events: none;
}
.hero-pane .corner.tl { top: 0; left: 0; }
.hero-pane .corner.tr { top: 0; right: 0; text-align: right; }
.hero-pane .corner.bl { bottom: 0; left: 0; }
.hero-pane .corner.br { bottom: 0; right: 0; text-align: right; }

.hero-pane .pane-header {
  position: absolute; top: 0; left: 0; right: 0;
  display: flex; justify-content: space-between; align-items: center;
  padding: 10px 14px;
  border-bottom: 1px solid var(--line);
  background: rgba(0,0,0,0.4);
  font-size: 10px; letter-spacing: 0.18em; text-transform: uppercase; color: var(--ink-3);
  z-index: 2;
}
.hero-pane .pane-header .ind {
  display: inline-flex; align-items: center; gap: 8px; color: var(--orange);
}
.hero-pane .pane-header .ind::before {
  content: ""; width: 6px; height: 6px; background: var(--orange);
}
.hero-pane .pane-footer {
  position: absolute; bottom: 0; left: 0; right: 0;
  display: flex; justify-content: space-between; align-items: center;
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  background: rgba(0,0,0,0.4);
  font-size: 10px; letter-spacing: 0.18em; text-transform: uppercase; color: var(--ink-3);
  z-index: 2;
}

.hero-pane svg { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }

/* ---------- BET / principles ---------- */
.bet {
  font-family: var(--display);
  font-size: clamp(28px, 3.2vw, 44px);
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--ink);
  max-width: 28ch;
}
.bet-grid {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 32px;
  align-items: start;
}
.bet-grid .body { display: flex; flex-direction: column; gap: 32px; }
.bet-grid p { max-width: 60ch; color: var(--ink-2); }
@media (max-width: 760px) { .bet-grid { grid-template-columns: 1fr; } }

.principles {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin-top: 64px;
}
.principles > article {
  background: var(--bg);
  padding: 28px 24px;
  display: flex; flex-direction: column; gap: 16px;
  min-height: 240px;
  position: relative;
}
.principles .no {
  font-family: var(--mono); font-size: 10px; letter-spacing: 0.16em; color: var(--orange);
}
.principles h3 { font-family: var(--display); font-size: 20px; line-height: 1.15; color: var(--ink); }
.principles p { font-size: 13px; color: var(--ink-3); }
.principles .glyph {
  position: absolute; top: 24px; right: 24px;
  width: 28px; height: 28px;
}
@media (max-width: 880px) { .principles { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 520px) { .principles { grid-template-columns: 1fr; } }

/* ---------- PRIMITIVES section (animated lineart) ---------- */
.prims {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.prims > article {
  background: var(--bg);
  padding: 32px;
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: 20px;
  min-height: 380px;
}
.prims .head { display: flex; justify-content: space-between; align-items: baseline; }
.prims .head .no { font-family: var(--mono); font-size: 10px; letter-spacing: 0.16em; color: var(--orange); }
.prims .head .type { font-family: var(--mono); font-size: 10px; letter-spacing: 0.16em; color: var(--ink-4); text-transform: uppercase; }
.prims h3 { font-family: var(--display); font-size: 26px; line-height: 1.1; color: var(--ink); }
.prims h3 .symbol { color: var(--orange); margin-right: 10px; font-family: var(--mono); }
.prims p { font-size: 13px; color: var(--ink-3); max-width: 46ch; }
.prims .anim-frame {
  border: 1px solid var(--line);
  background: var(--bg-1);
  aspect-ratio: 16/9;
  position: relative; overflow: hidden;
}
.prims .anim-frame svg { position: absolute; inset: 0; width: 100%; height: 100%; }
.prims .anim-frame .caption {
  position: absolute; bottom: 8px; left: 10px;
  font-family: var(--mono); font-size: 10px; color: var(--ink-4);
  letter-spacing: 0.1em; text-transform: uppercase;
}
@media (max-width: 880px) { .prims { grid-template-columns: 1fr; } }

/* ---------- CODE / intent hole showcase ---------- */
.intent-wrap {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: stretch;
}
@media (max-width: 960px) { .intent-wrap { grid-template-columns: 1fr; gap: 32px; } }

.intent-copy { display: flex; flex-direction: column; gap: 24px; }
.intent-copy h3 {
  font-family: var(--display); font-size: 28px; line-height: 1.15;
  color: var(--ink); max-width: 18ch;
}
.intent-copy p { color: var(--ink-2); font-size: 14px; max-width: 48ch; }
.intent-copy .steps { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 14px; }
.intent-copy .steps li {
  display: grid; grid-template-columns: 40px 1fr; gap: 14px;
  border-top: 1px solid var(--line); padding-top: 14px;
  font-size: 13px; color: var(--ink-2);
}
.intent-copy .steps .ix { color: var(--orange); font-family: var(--mono); font-size: 11px; letter-spacing: 0.14em; }

.code {
  background: var(--bg-1);
  border: 1px solid var(--line);
  position: relative;
  display: flex; flex-direction: column;
  min-height: 460px;
}
.code-head {
  display: flex; justify-content: space-between; align-items: center;
  padding: 10px 14px;
  border-bottom: 1px solid var(--line);
  font-family: var(--mono); font-size: 10px; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--ink-3);
}
.code-head .lights {
  display: inline-flex; gap: 6px;
}
.code-head .lights span {
  width: 8px; height: 8px; display: inline-block;
  border: 1px solid var(--line-2);
}
.code-head .lights span.on { background: var(--orange); border-color: var(--orange); }
.code-head .status { display: inline-flex; align-items: center; gap: 8px; color: var(--orange); }
.code-head .status::before { content: ""; width: 6px; height: 6px; background: var(--orange); }

.code pre {
  margin: 0; padding: 20px 24px;
  font-family: var(--mono); font-size: 13px; line-height: 1.7;
  color: var(--ink-2);
  overflow-x: auto;
  flex: 1;
}
.code .kw { color: var(--orange); }
.code .tp { color: #E8A76A; }
.code .str { color: #fff; }
.code .cm { color: var(--ink-4); }
.code .op { color: var(--orange); }
.code .hole { color: var(--orange); background: rgba(255,107,0,0.12); padding: 0 4px; border: 1px solid var(--orange-deep); }
.code .fn { color: #fff; }
.code .num { color: var(--ink); }
.code .caret {
  display: inline-block; width: 8px; height: 14px; background: var(--orange); vertical-align: -2px;
  margin-left: 4px;
  animation: caret-blink 0.9s step-end infinite;
}
@keyframes caret-blink {
  0%, 49% { opacity: 1; }
  50%, 100% { opacity: 0; }
}

.code-foot {
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  display: flex; justify-content: space-between; gap: 16px;
  font-family: var(--mono); font-size: 10px; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--ink-4);
}
.code-foot .ok { color: #8ADB7C; }

/* ---------- DRIFT ribbon ---------- */
.drift-wrap {
  border: 1px solid var(--line);
  background: var(--bg-1);
  padding: 28px;
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 32px;
  align-items: center;
}
@media (max-width: 880px) { .drift-wrap { grid-template-columns: 1fr; } }
.drift-wrap h3 { font-family: var(--display); font-size: 26px; color: var(--ink); line-height: 1.15; margin-bottom: 10px; }
.drift-wrap p { color: var(--ink-3); font-size: 13px; max-width: 40ch; }
.drift-anim {
  aspect-ratio: 4 / 1;
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--bg);
}
.drift-anim svg { position: absolute; inset: 0; width: 100%; height: 100%; }
.drift-anim .t-labels {
  position: absolute; bottom: 6px; left: 0; right: 0;
  display: flex; justify-content: space-between;
  padding: 0 8px;
  font-family: var(--mono); font-size: 9px; color: var(--ink-4); letter-spacing: 0.14em;
}

/* ---------- STATUS section ---------- */
.status-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}
@media (max-width: 880px) { .status-grid { grid-template-columns: 1fr; } }
.status-list { display: flex; flex-direction: column; }
.status-list h4 {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--ink-3); margin-bottom: 18px;
  border-bottom: 1px solid var(--line); padding-bottom: 10px;
  display: flex; justify-content: space-between;
}
.status-list h4 .count { color: var(--orange); }
.status-list ul { list-style: none; padding: 0; margin: 0; }
.status-list li {
  display: grid; grid-template-columns: 24px 1fr auto; gap: 12px;
  padding: 12px 0;
  border-bottom: 1px dashed var(--line);
  font-size: 13px; color: var(--ink-2);
}
.status-list li .ok { color: #8ADB7C; font-family: var(--mono); font-size: 11px; }
.status-list li .wip { color: var(--orange); font-family: var(--mono); font-size: 11px; }
.status-list li .tag { font-family: var(--mono); font-size: 10px; color: var(--ink-4); letter-spacing: 0.1em; }

/* ---------- INSTALL ---------- */
.install {
  border: 1px solid var(--line);
  background: var(--bg-1);
  padding: 32px;
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 32px;
  align-items: center;
}
@media (max-width: 880px) { .install { grid-template-columns: 1fr; } }
.install h3 { font-family: var(--display); font-size: 28px; color: var(--ink); line-height: 1.1; margin-bottom: 12px; }
.install p { color: var(--ink-3); font-size: 13px; max-width: 40ch; margin-bottom: 18px; }
.install-block {
  background: var(--bg);
  border: 1px solid var(--line);
  font-family: var(--mono); font-size: 13px; color: var(--ink);
  padding: 18px 20px;
  display: flex; flex-direction: column; gap: 8px;
}
.install-block .ln { display: flex; gap: 10px; align-items: center; }
.install-block .prompt { color: var(--orange); user-select: none; }
.install-block .cm { color: var(--ink-4); }

/* ---------- FOOTER ---------- */
.footer {
  border-top: 1px solid var(--line);
  padding: 64px 0 40px;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 32px;
}
@media (max-width: 760px) { .footer { grid-template-columns: 1fr 1fr; } }
.footer .brand { display: flex; flex-direction: column; gap: 12px; max-width: 36ch; padding-left: 12px; }
.footer .brand svg { height: 36px; width: auto; }
.footer .brand p { font-size: 12px; color: var(--ink-4); }
.footer h5 { font-family: var(--mono); font-size: 10px; letter-spacing: 0.18em; text-transform: uppercase; color: var(--ink-3); margin: 0 0 14px; }
.footer ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 8px; }
.footer a { font-size: 13px; color: var(--ink-2); display: inline-flex; align-items: center; gap: 8px; }
.footer a:hover { color: var(--orange); }
.footer .caret { color: var(--ink-4); font-family: var(--mono); }

.footer-bottom {
  border-top: 1px solid var(--line);
  margin-top: 48px;
  padding: 20px var(--pad);
  display: flex; justify-content: space-between;
  font-family: var(--mono); font-size: 10px; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--ink-4);
  max-width: var(--max);
  margin-left: auto; margin-right: auto;
}

/* ---------- utility shapes (decorative) ---------- */
.tick-row {
  display: flex; gap: 8px; align-items: center;
}
.tick-row .sq { width: 6px; height: 6px; background: var(--orange); }
.tick-row .sq.dim { background: var(--line-2); }

.rule { height: 1px; background: var(--line); width: 100%; }

/* readout blocks */
.readout {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 1px; background: var(--line);
  border: 1px solid var(--line);
  margin-top: 32px;
}
.readout > div {
  background: var(--bg);
  padding: 18px 16px;
  display: flex; flex-direction: column; gap: 4px;
}
.readout .k { font-size: 10px; letter-spacing: 0.18em; text-transform: uppercase; color: var(--ink-4); }
.readout .v { font-family: var(--display); font-size: 28px; color: var(--ink); line-height: 1; letter-spacing: -0.02em; }
.readout .s { font-size: 11px; color: var(--ink-3); margin-top: 4px; }
@media (max-width: 760px) { .readout { grid-template-columns: repeat(2, 1fr); } }

/* ---------- BG shape strips ---------- */
.shape-strip {
  height: 1px;
  background: linear-gradient(to right,
    transparent 0, transparent 20%,
    var(--orange) 20%, var(--orange) 21%,
    transparent 21%, transparent 60%,
    var(--line-2) 60%, var(--line-2) 80%,
    var(--orange) 80%, var(--orange) 82%,
    transparent 82%);
}

/* ---------- lineart draw animations ---------- */
.draw path,
.draw line,
.draw polyline {
  stroke-dasharray: var(--len, 1000);
  stroke-dashoffset: var(--len, 1000);
  animation: draw 3s ease forwards;
  animation-delay: var(--delay, 0s);
}
@keyframes draw { to { stroke-dashoffset: 0; } }

.pulse-dot {
  animation: fade 2.2s ease-in-out infinite;
  animation-delay: var(--delay, 0s);
}
@keyframes fade {
  0%, 100% { opacity: 0.2; }
  50% { opacity: 1; }
}

/* =========================================================
   DOCUMENTATION & CONTACT PAGES
   ========================================================= */

/* ---- back nav ---- */
.doc-breadcrumb {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--ink-4);
  margin-bottom: 24px;
}
.doc-breadcrumb:hover { color: var(--orange); }

/* ---- page title block ---- */
.doc-page-hero {
  padding: 80px 20px 64px;
  border-bottom: 1px solid var(--line);
}
.doc-page-hero .tag { font-family: var(--mono); font-size: 10px; letter-spacing: 0.18em; text-transform: uppercase; color: var(--orange); margin-bottom: 16px; display: block; }
.doc-page-hero h1 { font-family: var(--display); font-size: clamp(32px, 5vw, 64px); letter-spacing: -0.03em; color: var(--ink); line-height: 1; margin-bottom: 16px; }
.doc-page-hero p { font-size: 14px; color: var(--ink-3); max-width: 56ch; }

/* ---- layout: sidebar + content ---- */
.doc-layout {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 56px;
  padding: 56px 0 56px 20px;
}
@media (max-width: 880px) { .doc-layout { grid-template-columns: 1fr; gap: 32px; } }

.doc-sidebar { position: sticky; top: 80px; height: fit-content; }
.doc-sidebar h5 { font-family: var(--mono); font-size: 10px; letter-spacing: 0.18em; text-transform: uppercase; color: var(--ink-4); margin: 0 0 12px; }
.doc-sidebar ul { list-style: none; padding: 0; margin: 0 0 28px; display: flex; flex-direction: column; gap: 2px; }
.doc-sidebar a { font-family: var(--mono); font-size: 11px; letter-spacing: 0.08em; color: var(--ink-4); display: block; padding: 5px 0 5px 10px; border-left: 2px solid transparent; }
.doc-sidebar a:hover { color: var(--orange); border-left-color: var(--orange); }

/* ---- prose content ---- */
.prose { max-width: 72ch; }

.prose h2 {
  font-family: var(--display); font-size: clamp(20px, 2.5vw, 30px);
  color: var(--ink); letter-spacing: -0.02em; font-weight: 500;
  margin: 56px 0 18px; padding-top: 56px; border-top: 1px solid var(--line);
}
.prose h2:first-child { margin-top: 0; padding-top: 0; border-top: none; }
.prose h3 { font-family: var(--display); font-size: clamp(15px, 1.8vw, 20px); color: var(--ink); margin: 32px 0 12px; font-weight: 500; }
.prose h4 { font-family: var(--mono); font-size: 12px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--orange); margin: 24px 0 10px; }

.prose p { color: var(--ink-2); font-size: 14px; line-height: 1.7; margin: 0 0 16px; max-width: 64ch; }
.prose ul, .prose ol { color: var(--ink-2); font-size: 14px; padding-left: 0; margin: 0 0 16px; list-style: none; display: flex; flex-direction: column; gap: 6px; }
.prose li { line-height: 1.65; padding-left: 20px; position: relative; }
.prose ul li::before { content: "▸"; position: absolute; left: 0; color: var(--orange); font-size: 10px; top: 3px; }
.prose ol { counter-reset: item; }
.prose ol li::before { counter-increment: item; content: counter(item, decimal-leading-zero) " /"; position: absolute; left: 0; color: var(--orange); font-family: var(--mono); font-size: 10px; letter-spacing: 0.1em; top: 2px; }

.prose code { font-family: var(--mono); font-size: 12px; background: var(--bg-2); border: 1px solid var(--line); padding: 1px 5px; color: var(--orange); }
.prose pre { background: var(--bg-1); border: 1px solid var(--line); padding: 20px 24px; overflow-x: auto; margin: 0 0 24px; }
.prose pre code { background: none; border: none; padding: 0; font-size: 12.5px; color: var(--ink-2); }
.prose pre .kw { color: var(--orange); }
.prose pre .str { color: #fff; }
.prose pre .cm { color: var(--ink-4); }
.prose pre .fn { color: #fff; }
.prose pre .tp { color: #E8A76A; }

.prose blockquote { border-left: 2px solid var(--orange); padding: 12px 16px; margin: 24px 0; }
.prose blockquote p { font-family: var(--display); font-size: clamp(16px, 1.6vw, 20px); letter-spacing: -0.01em; color: var(--ink); margin: 0; }
.prose strong { color: var(--ink); font-weight: 500; }
.prose em { color: var(--orange); font-style: normal; }
.prose a { color: var(--orange); text-decoration: underline; text-underline-offset: 3px; }

/* chapter annotation */
.chapter-tag { font-family: var(--mono); font-size: 10px; letter-spacing: 0.18em; text-transform: uppercase; color: var(--orange); display: block; margin-bottom: 4px; }

/* ---- tables ---- */
.doc-table-wrap { overflow-x: auto; margin: 0 0 24px; }
.doc-table { width: 100%; border-collapse: collapse; font-family: var(--mono); font-size: 12px; }
.doc-table th { font-size: 10px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-4); border-bottom: 1px solid var(--line); padding: 10px 16px; text-align: left; background: var(--bg-1); }
.doc-table td { padding: 10px 16px; border-bottom: 1px dashed var(--line); color: var(--ink-2); vertical-align: top; line-height: 1.55; }
.doc-table td:first-child { color: var(--orange); white-space: nowrap; font-size: 13px; }
.doc-table tr:hover td { background: rgba(255,107,0,0.04); }

/* ---- callout box ---- */
.doc-callout { border-left: 2px solid var(--orange); background: rgba(255,107,0,0.05); padding: 14px 18px; margin: 20px 0; }
.doc-callout p { font-size: 13px; color: var(--ink-2); margin: 0; }
.doc-callout p strong { color: var(--orange); }

/* ---- inline diagram frames ---- */
.doc-diagram { border: 1px solid var(--line); background: var(--bg-1); padding: 24px; margin: 24px 0; }
.doc-diagram svg { display: block; width: 100%; height: auto; overflow: visible; }
.doc-diagram .caption { font-family: var(--mono); font-size: 10px; color: var(--ink-4); letter-spacing: 0.12em; text-transform: uppercase; display: block; margin-top: 12px; }

/* ---- doc hub cards ---- */
.doc-cards {
  display: grid; grid-template-columns: repeat(2, 1fr);
  gap: 1px; background: var(--line); border: 1px solid var(--line);
}
@media (max-width: 760px) { .doc-cards { grid-template-columns: 1fr; } }

.doc-card {
  background: var(--bg); padding: 32px;
  display: flex; flex-direction: column; gap: 14px;
  min-height: 260px; position: relative; transition: background 120ms;
}
.doc-card:hover { background: var(--bg-1); }
.doc-card .file-icon { width: 32px; height: auto; opacity: 0.85; }
.doc-card .doc-no { font-family: var(--mono); font-size: 10px; letter-spacing: 0.16em; color: var(--orange); }
.doc-card h3 { font-family: var(--display); font-size: 22px; color: var(--ink); line-height: 1.1; margin: 0; }
.doc-card p { font-size: 13px; color: var(--ink-3); flex: 1; margin: 0; line-height: 1.6; }
.doc-card .doc-link { font-family: var(--mono); font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--orange); display: inline-flex; align-items: center; gap: 8px; }
.doc-card .doc-link:hover { color: var(--ink); }
.doc-card .doc-type { font-family: var(--mono); font-size: 10px; letter-spacing: 0.12em; color: var(--ink-4); text-transform: uppercase; }

/* ---- PDF download block ---- */
.pdf-block {
  border: 1px solid var(--orange-deep);
  background: rgba(139,62,0,0.07);
  padding: 32px;
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
  margin-top: 2px;
}
@media (max-width: 640px) { .pdf-block { flex-direction: column; align-items: flex-start; } }
.pdf-block h3 { font-family: var(--display); font-size: 22px; color: var(--ink); margin: 0 0 6px; }
.pdf-block p { font-size: 13px; color: var(--ink-3); margin: 0; }

/* ---- contact page ---- */
.contact-hero { padding: 100px 20px 64px; border-bottom: 1px solid var(--line); }
.contact-body { padding: 72px 20px; }
.contact-grid { display: grid; grid-template-columns: 1.2fr 1fr; gap: 64px; align-items: start; }
@media (max-width: 760px) { .contact-grid { grid-template-columns: 1fr; gap: 48px; } }
.contact-email-block { border: 1px solid var(--line); padding: 32px; margin-top: 32px; background: var(--bg-1); }
.contact-email-block .label { font-family: var(--mono); font-size: 10px; letter-spacing: 0.18em; text-transform: uppercase; color: var(--ink-4); margin-bottom: 12px; display: block; }
.contact-email-link { font-family: var(--display); font-size: clamp(16px, 2.2vw, 24px); color: var(--orange); letter-spacing: -0.01em; }
.contact-email-link:hover { color: var(--ink); text-decoration: underline; text-underline-offset: 4px; }
.contact-aside { border-top: 1px solid var(--line); padding-top: 32px; }
.contact-aside h3 { font-family: var(--display); font-size: 20px; color: var(--ink); margin-bottom: 14px; }
.contact-aside p { font-size: 13px; color: var(--ink-3); line-height: 1.65; max-width: 40ch; }