/* ─────────────────────────────────────────────────────────────────────────
   Architeeli — Landing Page (dark theme)
   Dark canvas, cyan-blue accents, IBM Plex type.
   ───────────────────────────────────────────────────────────────────────── */

@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:ital,wght@0,400;0,500;0,600;1,400&family=IBM+Plex+Sans:wght@400;500;600&family=IBM+Plex+Serif:wght@400;500&display=swap');

/* ── Tokens ──────────────────────────────────────────────────────── */
:root {
  --bg:           #08111a;
  --panel:        #0f1d2b;
  --panel-2:      #0a1621;
  --panel-3:      #060e17;
  --panel-4:      #071018;

  --text:         #edf3f8;
  --text-2:       #c9d9e8;
  --muted:        #9db0c2;
  --faint:        #4a6880;

  --line:         rgba(140, 188, 234, 0.13);
  --line-mid:     rgba(140, 188, 234, 0.26);
  --line-strong:  rgba(140, 188, 234, 0.42);
  --line-soft:    rgba(140, 188, 234, 0.06);

  --accent:       #4dc7e0;
  --accent-2:     #7bdff2;
  --accent-ink:   #08141c;
  --accent-dim:   rgba(77, 199, 224, 0.16);
  --accent-tint:  rgba(77, 199, 224, 0.07);
  --accent-line:  rgba(77, 199, 224, 0.28);

  --ok:           #7ce0a2;
  --warn:         #f2b84d;
  --risk:         #f2786a;

  --font-display: 'IBM Plex Serif', Georgia, serif;
  --font-sans:    'IBM Plex Sans', 'Avenir Next', system-ui, sans-serif;
  --font-mono:    'IBM Plex Mono', 'SFMono-Regular', monospace;

  --radius:       10px;
  --radius-sm:    6px;
  --ease:         cubic-bezier(0.2, 0.7, 0.2, 1);
  --dur:          180ms;

  /* shims for any inline styles still referencing old paper/ink vars */
  --paper:        var(--bg);
  --paper-deep:   var(--panel-2);
  --surface:      var(--panel);
  --surface-tint: var(--panel-2);
  --vellum:       var(--panel);
  --ink:          var(--text);
  --ink-2:        var(--text-2);
  --ink-3:        var(--muted);
  --ink-4:        var(--faint);
  --ink-5:        rgba(74, 104, 128, 0.5);
  --blueprint:    var(--accent);
  --blueprint-2:  var(--accent-2);
  --blueprint-tint: var(--accent-tint);
  --blueprint-line: var(--accent-line);
  --rule:         var(--line);
  --rule-2:       var(--line-soft);
  --redline:      var(--risk);
  --redline-tint: rgba(242, 120, 106, 0.10);
  --ok-tint:      rgba(124, 224, 162, 0.10);
}

/* ── Reset ───────────────────────────────────────────────────────── */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

html, body {
  margin: 0; padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: clip;
}

a { color: inherit; text-decoration: none; }
button { font: inherit; }
p, h1, h2, h3, h4, h5, h6 { margin: 0; }

h1, h2, h3, h4, h5, h6 { color: var(--text); }

h1 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(2.4rem, 5.4vw, 4.2rem);
  line-height: 1.05;
  letter-spacing: -0.03em;
}
h2 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.8rem, 3.6vw, 2.8rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
}
h3 { font-family: var(--font-sans); font-weight: 600; font-size: 1.25rem; line-height: 1.25; }

code, kbd, samp {
  font-family: var(--font-mono);
  font-size: 0.88em;
  color: var(--accent-2);
  background: var(--accent-tint);
  border: 1px solid var(--accent-line);
  border-radius: 4px;
  padding: 1px 5px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-2);
}
.eyebrow .tick { width: 6px; height: 1px; background: var(--accent); }

/* ── Plate (max-width container) ─────────────────────────────────── */
.plate {
  max-width: 1280px;
  margin: 0 auto;
  position: relative;
  padding: 0 56px;
}
@media (max-width: 760px) { .plate { padding: 0 20px; } }

/* ── Plate hairline rules & corners ──────────────────────────────── */
.plate-rules {
  position: fixed;
  top: 0; bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: min(1280px, 100%);
  pointer-events: none;
  z-index: 0;
}
.plate-rules::before,
.plate-rules::after {
  content: "";
  position: absolute;
  top: 64px; bottom: 64px;
  width: 1px;
  background: linear-gradient(to bottom,
    transparent 0,
    rgba(77, 199, 224, 0.0) 1%,
    rgba(77, 199, 224, 0.18) 5%,
    rgba(77, 199, 224, 0.18) 95%,
    rgba(77, 199, 224, 0) 100%
  );
}
.plate-rules::before { left: 28px; }
.plate-rules::after  { right: 28px; }
@media (max-width: 760px) {
  .plate-rules::before, .plate-rules::after { display: none; }
}

.plate-corner {
  position: fixed;
  width: 22px; height: 22px;
  pointer-events: none;
  opacity: 0.45;
  z-index: 1;
}
.plate-corner svg { display: block; width: 100%; height: 100%; }
.plate-corner.tl { top: 18px; left: max(20px, calc(50% - 640px + 18px)); }
.plate-corner.tr { top: 18px; right: max(20px, calc(50% - 640px + 18px)); }
.plate-corner.bl { bottom: 18px; left: max(20px, calc(50% - 640px + 18px)); }
.plate-corner.br { bottom: 18px; right: max(20px, calc(50% - 640px + 18px)); }

/* ── Sticky nav wrapper ──────────────────────────────────────────── */
.nav-wrap {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  background: rgba(8, 17, 26, 0.78);
  border-bottom: 1px solid var(--line);
}

/* ── Nav ─────────────────────────────────────────────────────────── */
.nav {
  position: relative;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 0;
}
.nav-logo { display: inline-flex; align-items: center; }
.nav-logo img { height: 50px; display: block; }
.nav-links {
  display: flex;
  gap: 26px;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  color: var(--muted);
}
.nav-links a { padding: 4px 0; }
.nav-links a:hover { color: var(--text); }
.nav-cta { display: flex; align-items: center; gap: 8px; }
@media (max-width: 760px) { .nav-links { display: none; } }

/* ── Section primitives ──────────────────────────────────────────── */
.section {
  position: relative;
  z-index: 2;
  padding: 80px 0 56px;
  border-top: 1px solid var(--line-soft);
}
.section-head {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 48px;
  align-items: start;
  margin-bottom: 48px;
}
@media (max-width: 760px) {
  .section { padding: 56px 0 32px; }
  .section-head { grid-template-columns: 1fr; gap: 16px; margin-bottom: 32px; }
}

.section-mark {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--faint);
  letter-spacing: 0.10em;
  text-transform: uppercase;
}
.section-mark .num {
  color: var(--accent);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
}
.section-mark .line {
  width: 28px; height: 1px; background: var(--faint); margin: 4px 0 2px;
}

.section-title {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.8rem, 3.2vw, 2.8rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--text);
  max-width: 20ch;
}
.section-title em {
  font-style: italic;
  color: var(--accent-2);
}
.section-sub {
  margin-top: 14px;
  font-size: 1.02rem;
  line-height: 1.6;
  color: var(--muted);
  max-width: 58ch;
}

/* ── Buttons ─────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background var(--dur) var(--ease), transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); }

.btn-primary {
  color: var(--accent-ink);
  background: linear-gradient(180deg, #a3ebfa 0%, var(--accent) 100%);
  box-shadow: 0 8px 24px rgba(77, 199, 224, 0.25);
}
.btn-primary:hover { box-shadow: 0 12px 32px rgba(77, 199, 224, 0.35); }

.btn-accent {
  color: var(--accent-ink);
  background: linear-gradient(180deg, #a3ebfa 0%, var(--accent) 100%);
  box-shadow: 0 8px 24px rgba(77, 199, 224, 0.25);
}
.btn-accent:hover { box-shadow: 0 12px 32px rgba(77, 199, 224, 0.35); }

.btn-outline {
  background: transparent;
  border: 1px solid var(--line-mid);
  color: var(--text);
}
.btn-outline:hover { border-color: var(--accent-line); color: var(--accent-2); }

.btn-ghost {
  background: transparent;
  color: var(--muted);
}
.btn-ghost:hover { color: var(--text); }

.btn-sm { padding: 6px 14px; font-size: 0.85rem; }
.btn-icon { width: 14px; height: 14px; flex-shrink: 0; }

/* ── Tag chip ─────────────────────────────────────────────────── */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--accent-tint);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent-2);
}

/* ── Hairline dim divider ─────────────────────────────────────── */
.hr-dim {
  position: relative;
  height: 14px;
  margin: 8px 0;
  display: flex;
  align-items: center;
}
.hr-dim::before, .hr-dim::after {
  content: "";
  position: absolute; top: 6px;
  height: 1px;
  background: linear-gradient(to right, transparent, var(--faint) 40%, var(--faint) 60%, transparent);
}
.hr-dim::before { left: 0; right: calc(50% + 60px); }
.hr-dim::after  { left: calc(50% + 60px); right: 0; }
.hr-dim span {
  position: absolute; left: 50%; transform: translateX(-50%);
  font-family: var(--font-mono); font-size: 0.68rem; color: var(--faint); letter-spacing: 0.08em;
  background: var(--bg); padding: 0 12px;
}

/* ── Hero ────────────────────────────────────────────────────────── */
.hero { padding: 80px 0 48px; position: relative; z-index: 2; }

.hero-eyebrow {
  display: flex; gap: 10px; align-items: center; flex-wrap: wrap;
  margin-bottom: 28px;
}
.hero-eyebrow .pill {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 5px 12px;
  border: 1px solid var(--line);
  background: var(--panel);
  border-radius: 999px;
  color: var(--muted);
}
.hero-eyebrow .pill.blue {
  color: var(--accent-2);
  border-color: var(--accent-line);
  background: var(--accent-tint);
}

.hero h1 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(2.4rem, 5.5vw, 4.4rem);
  line-height: 1.04;
  letter-spacing: -0.03em;
  color: var(--text);
  margin: 0 0 24px;
  max-width: 20ch;
}
.hero h1 .blue { color: var(--accent-2); font-style: italic; }
.hero h1 .ul {
  position: relative;
  background-image: linear-gradient(transparent 88%, rgba(77,199,224,0.35) 88%, rgba(77,199,224,0.35) 93%, transparent 93%);
}

.hero-lead {
  font-size: 1.1rem;
  line-height: 1.55;
  color: var(--muted);
  max-width: 56ch;
  margin: 0 0 28px;
}
.hero-ctas { display: flex; gap: 12px; flex-wrap: wrap; }
.hero-note {
  margin-top: 24px;
  display: flex; align-items: center; gap: 10px;
  font-size: 0.88rem;
  color: var(--muted);
}
.hero-note .dot { width: 6px; height: 6px; border-radius: 999px; background: var(--ok); }

/* ── Cartouche (title block) ─────────────────────────────────────── */
.cartouche {
  border: 1px solid var(--line-mid);
  background: var(--panel-3);
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-2);
}
.cartouche > .cell {
  padding: 8px 12px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  display: flex; flex-direction: column; gap: 3px;
  min-width: 0;
}
.cartouche > .cell:nth-child(6n) { border-right: none; }
.cartouche > .cell:nth-last-child(-n+6) { border-bottom: none; }
.cartouche .lbl {
  font-size: 0.6rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--faint);
}
.cartouche .val {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.cartouche .val.mono { font-family: var(--font-mono); }
.cartouche .val.ok   { color: var(--ok); }
.cartouche .val.blue { color: var(--accent); }
.cartouche .cell.span2 { grid-column: span 2; }

/* ── Editor preview frame ────────────────────────────────────────── */
.preview-frame {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--line-mid);
  box-shadow: 0 2px 0 rgba(0,0,0,0.2), 0 24px 60px rgba(0,0,0,0.4);
  overflow: hidden;
  border-radius: var(--radius-sm);
  margin-top: 24px;
}
.preview-frame .topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 16px;
  border-bottom: 1px solid var(--line);
  background: var(--panel-3);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--muted);
}
.preview-frame .topbar .dots { display: flex; gap: 6px; }
.preview-frame .topbar .dots i {
  width: 9px; height: 9px; border-radius: 999px;
  background: var(--line-mid); display: block;
}
.preview-frame .body {
  display: grid;
  grid-template-columns: 200px 1fr 264px;
  min-height: 520px;
}
@media (max-width: 1100px) {
  .preview-frame .body { grid-template-columns: 1fr; min-height: 0; }
  .preview-outline, .preview-assistant { display: none; }
}

/* Outline pane */
.preview-outline {
  border-right: 1px solid var(--line);
  padding: 16px 12px;
  background: var(--panel-3);
  font-family: var(--font-sans);
  font-size: 0.78rem;
  color: var(--text-2);
}
.preview-outline .ol-title {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--faint);
  margin-bottom: 10px;
}
.preview-outline .ol-item {
  display: flex;
  align-items: baseline;
  gap: 7px;
  padding: 4px 6px;
  border-radius: var(--radius-sm);
  margin-bottom: 1px;
  cursor: default;
}
.preview-outline .ol-item .n {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--faint);
  min-width: 24px;
}
.preview-outline .ol-item.active {
  background: var(--accent-dim);
}
.preview-outline .ol-item.active .n,
.preview-outline .ol-item.active .t { color: var(--accent); font-weight: 500; }
.preview-outline .ol-item .t { color: var(--muted); font-size: 0.78rem; }
.preview-outline .ol-item.child { padding-left: 24px; }

/* Center pane */
.preview-center {
  position: relative;
  padding: 20px 22px;
  background: var(--panel-2);
  overflow: hidden;
}
.preview-center .crumb {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  color: var(--faint);
  margin-bottom: 8px;
}
.preview-center .crumb .blue { color: var(--accent); }
.preview-center .crumb .ink  { color: var(--text); }
.preview-center .ch-title {
  display: flex; align-items: baseline; gap: 12px;
  margin-bottom: 12px;
}
.preview-center .ch-title .num {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--accent);
}
.preview-center .ch-title .name {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--text);
  line-height: 1.05;
}

.diagram-canvas {
  position: relative;
  border: 1px solid var(--line);
  background: var(--panel-3);
  height: 340px;
  overflow: hidden;
  background-image: radial-gradient(circle, rgba(77, 199, 224, 0.06) 1px, transparent 1px);
  background-size: 20px 20px;
  border-radius: var(--radius-sm);
}
.diagram-canvas svg { display: block; width: 100%; height: 100%; }

/* Assistant pane */
.preview-assistant {
  border-left: 1px solid var(--line);
  padding: 14px 12px;
  background: var(--panel);
  display: flex; flex-direction: column; gap: 12px;
}
.assistant-h {
  display: flex; align-items: center; gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  border-bottom: 1px solid var(--line);
  padding-bottom: 10px;
}
.assistant-msg {
  background: var(--accent-tint);
  border: 1px solid var(--accent-line);
  border-radius: var(--radius-sm);
  padding: 9px 11px;
  font-family: var(--font-sans);
  font-size: 0.82rem;
  color: var(--text-2);
  line-height: 1.5;
}
.assistant-msg b { color: var(--accent); font-weight: 500; }
.assistant-prompt {
  background: var(--panel-3);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 9px 11px;
  font-family: var(--font-sans);
  font-size: 0.78rem;
  color: var(--muted);
  display: flex; flex-direction: column; gap: 8px;
  margin-top: auto;
}
.assistant-prompt .row {
  display: flex; align-items: center; justify-content: space-between;
  font-family: var(--font-mono); font-size: 0.65rem; color: var(--faint);
}

/* ── Why cards (3-col grid) ──────────────────────────────────────── */
.cards-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}
@media (max-width: 900px) { .cards-3 { grid-template-columns: 1fr; } }

.cards-3 > .feature {
  padding: 24px 24px 28px;
  background: linear-gradient(180deg, rgba(15, 29, 43, 0.9), rgba(8, 17, 26, 0.95));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  display: flex; flex-direction: column; gap: 14px;
  min-height: 360px;
  transition: border-color var(--dur) var(--ease);
}
.cards-3 > .feature:hover { border-color: var(--line-mid); }

.feature .f-mark {
  display: flex; align-items: center; justify-content: space-between;
  font-family: var(--font-mono); font-size: 0.65rem;
  letter-spacing: 0.12em; text-transform: uppercase; color: var(--faint);
}
.feature .f-mark .n { color: var(--accent); }
.feature .f-visual {
  height: 130px;
  border: 1px solid var(--line);
  background: var(--panel-3);
  background-image: radial-gradient(circle, rgba(77,199,224,0.05) 1px, transparent 1px);
  background-size: 12px 12px;
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-sm);
}
.feature .f-title {
  font-family: var(--font-sans);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.3;
}
.feature .f-body {
  font-family: var(--font-sans);
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--muted);
}

/* ── How it works (3 steps) ──────────────────────────────────────── */
.how-wrap { position: relative; z-index: 2; }

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
@media (max-width: 900px) { .steps { grid-template-columns: 1fr; gap: 18px; } }

.step {
  position: relative;
  padding: 28px 22px 22px;
  background: linear-gradient(180deg, rgba(15, 29, 43, 0.9), rgba(8, 17, 26, 0.95));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  display: flex; flex-direction: column; gap: 12px;
}
.step .num {
  font-family: var(--font-display);
  font-size: 4rem;
  line-height: 0.9;
  font-weight: 500;
  color: var(--text);
  letter-spacing: -0.04em;
  display: inline-flex; align-items: baseline; gap: 8px;
  opacity: 0.85;
}
.step .num .of {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--faint);
  letter-spacing: 0.08em;
  font-weight: 400;
}
.step .title {
  font-family: var(--font-sans);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
}
.step .body {
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--muted);
}
.step .visual {
  margin-top: 8px;
  border: 1px solid var(--line);
  background: var(--panel-3);
  padding: 12px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--muted);
  min-height: 130px;
  border-radius: var(--radius-sm);
}
.step .visual .gen-line { color: var(--text-2); line-height: 1.7; }
.step .visual .gen-line.dim { color: var(--faint); }
.step .visual .gen-line .blue { color: var(--accent); }

/* ── Diagrams section ────────────────────────────────────────────── */
.diag-showcase {
  border: 1px solid var(--line-mid);
  background: var(--panel);
  display: grid;
  grid-template-columns: 210px 1fr;
  border-radius: var(--radius);
  overflow: hidden;
}
@media (max-width: 900px) { .diag-showcase { grid-template-columns: 1fr; } }

.diag-tabs {
  border-right: 1px solid var(--line);
  display: flex; flex-direction: column;
  background: var(--panel-3);
}
@media (max-width: 900px) {
  .diag-tabs { flex-direction: row; border-right: 0; border-bottom: 1px solid var(--line); overflow-x: auto; }
}

.diag-tab {
  padding: 16px 16px;
  border: 0;
  background: transparent;
  text-align: left;
  cursor: pointer;
  border-bottom: 1px solid var(--line);
  display: flex; flex-direction: column; gap: 4px;
  position: relative;
  transition: background var(--dur) var(--ease);
}
.diag-tab:last-child { border-bottom: 0; }
.diag-tab .tab-n {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--faint);
}
.diag-tab .tab-name {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--text);
}
.diag-tab .tab-sub {
  font-size: 0.78rem;
  color: var(--muted);
  margin-top: 1px;
}
.diag-tab[aria-selected="true"] { background: var(--panel); }
.diag-tab[aria-selected="true"]::before {
  content: "";
  position: absolute; left: 0; top: 0; bottom: 0;
  width: 3px;
  background: var(--accent);
}
@media (max-width: 900px) {
  .diag-tab[aria-selected="true"]::before {
    left: 0; right: 0; top: auto; bottom: 0; width: auto; height: 3px;
  }
}
.diag-tab:hover { background: rgba(77,199,224,0.04); }

.diag-body { display: block; }

.diag-panel:not([hidden]) {
  display: grid;
  grid-template-columns: minmax(240px, 300px) 1fr;
}
@media (max-width: 900px) {
  .diag-panel:not([hidden]) { grid-template-columns: 1fr; }
}

.diag-code {
  padding: 16px 0;
  background: #060e17;
  color: #c9d9e8;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.65;
  overflow: hidden;
  position: relative;
}
.diag-code .gutter {
  position: absolute; left: 0; top: 0; bottom: 0;
  width: 34px; padding: 16px 0;
  text-align: right; color: rgba(77,199,224,0.20);
  font-size: 0.68rem; line-height: 1.65;
}
.diag-code .lines {
  padding: 0 16px 0 48px;
  white-space: pre;
  overflow-x: auto;
}
.diag-code .k  { color: #7bdff2; }
.diag-code .s  { color: #f2c97a; }
.diag-code .c  { color: rgba(77,199,224,0.35); font-style: italic; }
.diag-code .id { color: #c9d9e8; }
.diag-code .p  { color: #5a8ab0; }
.diag-code .a  { color: #f2b0a0; }

.diag-canvas {
  background: var(--panel-2);
  position: relative;
  background-image: radial-gradient(circle, rgba(77,199,224,0.06) 1px, transparent 1px);
  background-size: 20px 20px;
  min-height: 360px;
  padding: 16px;
}
.diag-canvas svg { display: block; width: 100%; height: 100%; }
.diag-canvas .canvas-meta {
  position: absolute; top: 12px; right: 14px;
  font-family: var(--font-mono); font-size: 0.65rem;
  color: var(--faint); letter-spacing: 0.04em;
  display: flex; align-items: center; gap: 8px;
}

/* ── Architect in control (note block) ───────────────────────────── */
.note-block {
  border: 1px solid var(--line-mid);
  background: linear-gradient(135deg, rgba(15, 29, 43, 0.95), rgba(8, 17, 26, 0.98));
  padding: 36px 44px;
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 36px;
  align-items: start;
  border-radius: var(--radius);
}
@media (max-width: 760px) {
  .note-block { grid-template-columns: 1fr; padding: 26px 22px; gap: 16px; }
}
.note-block .stamp {
  border: 1.5px solid rgba(242, 120, 106, 0.55);
  color: var(--risk);
  padding: 8px 12px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transform: rotate(-2deg);
  align-self: start;
  background: rgba(242, 120, 106, 0.06);
  border-radius: var(--radius-sm);
}
.note-block .stamp::before {
  content: "";
  width: 7px; height: 7px; border-radius: 999px;
  background: var(--risk);
}
.note-block h3 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.4rem, 2.5vw, 2rem);
  letter-spacing: -0.015em;
  color: var(--text);
  line-height: 1.15;
  margin: 0 0 12px;
}
.note-block p {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--muted);
}

/* ── Pricing ─────────────────────────────────────────────────────── */
.pricing {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}
@media (max-width: 900px) { .pricing { grid-template-columns: 1fr; } }

.plan {
  background: linear-gradient(180deg, rgba(15, 29, 43, 0.88), rgba(8, 17, 26, 0.94));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 24px;
  display: flex; flex-direction: column; gap: 16px;
  position: relative;
  min-height: 460px;
  transition: border-color var(--dur) var(--ease);
}
.plan:hover { border-color: var(--line-mid); }

.plan.featured {
  border-color: rgba(77, 199, 224, 0.40);
  background: linear-gradient(180deg, rgba(10, 30, 38, 0.92), rgba(8, 17, 26, 0.96));
  box-shadow: 0 16px 40px rgba(77, 199, 224, 0.14);
}
.plan .ribbon {
  position: absolute;
  top: -11px; right: 16px;
  padding: 4px 12px;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  background: linear-gradient(180deg, #a3ebfa, var(--accent));
  color: var(--accent-ink);
  border-radius: 999px;
  font-weight: 600;
}
.plan .p-head {
  display: flex; align-items: center; justify-content: space-between;
  border-bottom: 1px solid var(--line);
  padding-bottom: 12px;
}
.plan .p-name {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 500;
  color: var(--text);
}
.plan .p-tag {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: var(--faint);
}
.plan .p-price { display: flex; align-items: baseline; gap: 8px; }
.plan .p-amount {
  font-family: var(--font-display);
  font-size: 2.8rem;
  font-weight: 500;
  color: var(--text);
  letter-spacing: -0.03em;
  line-height: 1;
}
.plan .p-unit {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--muted);
}
.plan .p-blurb { font-size: 0.88rem; color: var(--muted); line-height: 1.5; }

.plan ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 0; }
.plan li {
  display: flex; align-items: flex-start; gap: 10px;
  font-size: 0.88rem;
  color: var(--muted);
  line-height: 1.5;
  padding: 8px 0;
  border-top: 1px solid var(--line);
}
.plan li::before {
  content: "";
  width: 13px; height: 13px;
  flex-shrink: 0;
  margin-top: 2px;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 14 14' fill='none' stroke='%234dc7e0' stroke-width='1.5' stroke-linecap='round'><polyline points='3 7.5 6 10.5 11 4.5'/></svg>");
  background-size: contain; background-repeat: no-repeat;
}
.plan .p-cta { margin-top: auto; }
.plan .p-cta .btn { width: 100%; justify-content: center; border-radius: var(--radius-sm); }

.pricing-foot {
  margin-top: 22px;
  padding: 14px 0;
  font-size: 0.88rem;
  color: var(--muted);
  display: flex; align-items: center; gap: 8px;
  border-top: 1px solid var(--line);
}
.pricing-foot a { color: var(--accent-2); }
.pricing-foot a:hover { color: var(--text); }

/* ── Final CTA ───────────────────────────────────────────────────── */
.final-cta {
  border: 1px solid var(--line-mid);
  background: linear-gradient(135deg, rgba(10, 30, 38, 0.95), rgba(8, 17, 26, 0.98));
  padding: 56px 60px;
  border-radius: var(--radius);
  position: relative;
  overflow: hidden;
}
@media (max-width: 760px) { .final-cta { padding: 32px 24px; } }
.final-cta h2 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.6rem, 3.5vw, 3rem);
  line-height: 1.05;
  letter-spacing: -0.025em;
  color: var(--text);
  max-width: 20ch;
  margin: 0 0 16px;
}
.final-cta p {
  font-size: 1rem;
  color: var(--muted);
  line-height: 1.6;
  max-width: 60ch;
  margin: 0 0 28px;
}
.final-cta .row { display: flex; gap: 12px; flex-wrap: wrap; }
.final-cta .bg-mark {
  position: absolute;
  right: -40px; top: 50%;
  width: 260px; height: 260px;
  transform: translateY(-50%);
  opacity: 0.04;
  pointer-events: none;
  filter: invert(1);
}
@media (max-width: 900px) { .final-cta .bg-mark { display: none; } }

/* ── Footer ──────────────────────────────────────────────────────── */
.footer {
  margin-top: 80px;
  padding: 28px 0 24px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--muted);
  letter-spacing: 0.04em;
  position: relative; z-index: 2;
}
.footer .row {
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 14px;
}
.footer .links { display: flex; gap: 20px; }
.footer a:hover { color: var(--text); }
.footer-cartouche { margin-top: 16px; }