:root {
  color-scheme: light dark;
  --bg: #0a0f12;
  --bg-soft: #0e1418;
  --fg: #e6f0ee;
  --fg-soft: #8da3a0;
  --accent: #2dd4bf;
  --accent-soft: #5ee9d6;
  --green: #5fc88f;
  --rule: #1a2329;
  --code-bg: #131a1f;
  --max: 920px;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #fafaf6;
    --bg-soft: #ffffff;
    --fg: #1a1a1a;
    --fg-soft: #555;
    --accent: #0f766e;
    --accent-soft: #14b8a6;
    --green: #2f855a;
    --rule: #e3e7e5;
    --code-bg: #f0eee6;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: ui-sans-serif, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px dotted var(--accent);
}
a:hover { color: var(--accent-soft); border-bottom-style: solid; }

code, pre {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 14.5px;
}

pre {
  background: var(--code-bg);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 14px 16px;
  overflow-x: auto;
  line-height: 1.45;
}
code { background: var(--code-bg); padding: 1px 5px; border-radius: 3px; }
pre code { background: transparent; padding: 0; }

header.site {
  border-bottom: 1px solid var(--rule);
  padding: 22px 24px;
}
header.site .inner {
  max-width: var(--max);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
header.site .brand {
  font-weight: 700;
  letter-spacing: 0.02em;
  font-size: 18px;
  color: var(--fg);
  border-bottom: none;
}
header.site .brand .mark {
  color: var(--accent);
  margin-right: 6px;
}
header.site nav a {
  margin-left: 18px;
  color: var(--fg-soft);
  border-bottom: none;
  font-size: 14.5px;
}
header.site nav a:hover { color: var(--accent); }
header.site nav a.current { color: var(--fg); }

main {
  max-width: var(--max);
  margin: 0 auto;
  padding: 40px 24px 80px;
}

.hero {
  padding: 32px 0 8px;
  border-bottom: 1px dashed var(--rule);
  margin-bottom: 36px;
}
.hero .eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 12.5px;
  color: var(--accent);
  margin-bottom: 14px;
}
.hero h1 {
  font-size: 40px;
  line-height: 1.12;
  margin: 0 0 14px;
  letter-spacing: -0.01em;
}
.hero p.lede {
  font-size: 19px;
  color: var(--fg-soft);
  margin: 0 0 24px;
  max-width: 62ch;
}

h2 {
  font-size: 24px;
  margin: 40px 0 12px;
  letter-spacing: -0.005em;
}
h3 { font-size: 18px; margin: 28px 0 6px; }
p { margin: 0 0 14px; }
ul { margin: 6px 0 18px; padding-left: 22px; }
li { margin: 4px 0; }

.kicker-list li::marker { color: var(--accent); }

.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 14px;
  margin: 18px 0 36px;
}
.project-card {
  background: var(--bg-soft);
  border: 1px solid var(--rule);
  border-radius: 8px;
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
}
.project-card .tag-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}
.project-card .tag {
  font-family: ui-monospace, monospace;
  font-size: 11.5px;
  padding: 1px 8px;
  border-radius: 999px;
  border: 1px solid var(--rule);
  color: var(--fg-soft);
  letter-spacing: 0.04em;
}
.project-card .tag--ok { color: var(--green); border-color: var(--green); }
.project-card .tag--proto { color: var(--accent); border-color: var(--accent); }
.project-card h3 {
  margin: 0 0 6px;
  font-size: 18px;
}
.project-card h3 .name {
  font-family: ui-monospace, monospace;
  color: var(--accent);
  letter-spacing: 0;
}
.project-card p {
  font-size: 14.5px;
  color: var(--fg-soft);
  margin: 0 0 14px;
  flex: 1;
}
.project-card .more {
  font-size: 13.5px;
  margin-top: auto;
}

.stat-row {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  padding: 18px 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  margin: 18px 0 32px;
}
.stat { flex: 1 1 150px; }
.stat .num {
  display: block;
  font-size: 26px;
  font-weight: 700;
  color: var(--accent);
}
.stat .label {
  display: block;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--fg-soft);
  margin-top: 2px;
}

.callout {
  background: var(--bg-soft);
  border-left: 3px solid var(--accent);
  padding: 14px 18px;
  border-radius: 0 6px 6px 0;
  margin: 22px 0;
}
.callout .label {
  display: block;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin-bottom: 4px;
}

.principle-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 18px;
  margin: 18px 0 32px;
}
.principle {
  background: var(--bg-soft);
  border: 1px solid var(--rule);
  border-radius: 8px;
  padding: 18px 20px;
}
.principle h3 {
  margin: 0 0 6px;
  font-size: 17px;
  color: var(--accent-soft);
}
.principle p {
  font-size: 14.5px;
  margin: 0;
  color: var(--fg-soft);
}

.diagram {
  background: var(--code-bg);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 18px 20px;
  margin: 18px 0 28px;
  font-family: ui-monospace, monospace;
  font-size: 13.5px;
  line-height: 1.55;
  overflow-x: auto;
  white-space: pre;
  color: var(--fg);
}
.diagram .arrow { color: var(--accent); }
.diagram .label { color: var(--fg-soft); }

table.deps {
  width: 100%;
  border-collapse: collapse;
  margin: 14px 0 28px;
  font-size: 14.5px;
}
table.deps th, table.deps td {
  text-align: left;
  padding: 8px 10px;
  border-bottom: 1px solid var(--rule);
}
table.deps th {
  font-weight: 600;
  color: var(--fg-soft);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
table.deps td:first-child {
  font-family: ui-monospace, monospace;
  color: var(--accent);
  width: 30%;
}

footer.site {
  border-top: 1px solid var(--rule);
  padding: 22px 24px;
  color: var(--fg-soft);
  font-size: 13.5px;
}
footer.site .inner {
  max-width: var(--max);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}
footer.site a {
  color: var(--fg-soft);
  border-bottom-color: var(--fg-soft);
}

.steps {
  counter-reset: step;
  list-style: none;
  padding: 0;
  margin: 18px 0 28px;
}
.steps > li {
  counter-increment: step;
  position: relative;
  padding-left: 44px;
  margin: 20px 0;
}
.steps > li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 2px;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  border: 1px solid var(--accent);
  color: var(--accent);
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
}

.tagline {
  font-family: ui-monospace, monospace;
  color: var(--accent);
  font-size: 14px;
  letter-spacing: 0.04em;
  margin: 0 0 12px;
}


/* ============ Comparison page ============ */

.compare-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 14px 0 22px;
  padding: 14px 18px;
  background: var(--bg-soft);
  border: 1px solid var(--rule);
  border-radius: 8px;
  position: sticky;
  top: 0;
  z-index: 5;
  backdrop-filter: blur(6px);
}
.compare-nav a {
  border: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  border-radius: 999px;
  padding: 6px 14px;
  font-size: 14px;
  color: var(--fg-soft);
  font-family: ui-monospace, monospace;
  letter-spacing: 0.02em;
  background: var(--bg);
}
.compare-nav a:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  align-items: center;
  margin: -6px 0 26px;
  padding: 12px 16px;
  border: 1px dashed var(--rule);
  border-radius: 6px;
  font-size: 13.5px;
  color: var(--fg-soft);
}
.legend > span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.legend .cell-yes,
.legend .cell-no,
.legend .cell-partial {
  font-size: 16px;
  display: inline-block;
  min-width: 14px;
  text-align: center;
}
.legend .cell-partial { font-size: 22px; line-height: 0.6; }

.cell-diff-inline {
  font-family: ui-monospace, monospace;
  font-size: 11px;
  padding: 1px 6px;
  border-radius: 3px;
  background: rgba(45, 212, 191, 0.12);
  color: var(--accent);
  border: 1px solid var(--accent);
  letter-spacing: 0.03em;
}

.compare-section {
  scroll-margin-top: 110px;
  margin-top: 56px;
  padding-top: 8px;
  border-top: 1px dashed var(--rule);
}
.compare-section:first-of-type {
  margin-top: 28px;
  border-top: none;
}
.compare-section > h2 {
  margin-top: 26px;
}
.compare-section > h2 code {
  font-family: ui-monospace, monospace;
  background: transparent;
  padding: 0;
  color: var(--accent);
}

.matrix-shell {
  overflow-x: auto;
  border: 1px solid var(--rule);
  border-radius: 8px;
  margin: 12px 0 30px;
  background: var(--bg-soft);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.18);
  -webkit-overflow-scrolling: touch;
}

.matrix {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  font-size: 14px;
  min-width: 980px;
}

.matrix thead th {
  background: var(--code-bg);
  color: var(--fg-soft);
  font-weight: 600;
  font-size: 12px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 14px 10px;
  border-bottom: 1px solid var(--rule);
  vertical-align: bottom;
  text-align: center;
  white-space: nowrap;
}
.matrix thead th.own {
  color: var(--accent);
  background: rgba(45, 212, 191, 0.10);
  border-bottom-color: var(--accent);
  text-transform: none;
  font-size: 14px;
  letter-spacing: 0;
}
.matrix thead th.sticky-col {
  text-align: left;
  text-transform: uppercase;
  position: sticky;
  left: 0;
  z-index: 2;
  background: var(--code-bg);
}

.matrix tbody th.sticky-col {
  text-align: left;
  font-weight: 500;
  color: var(--fg);
  padding: 11px 14px;
  border-bottom: 1px solid var(--rule);
  background: var(--bg-soft);
  position: sticky;
  left: 0;
  z-index: 1;
  min-width: 300px;
  max-width: 380px;
  white-space: normal;
  line-height: 1.35;
}
.matrix tbody th.sticky-col code {
  font-size: 12.5px;
  background: transparent;
  padding: 0;
}

.matrix tbody td {
  text-align: center;
  padding: 11px 10px;
  border-bottom: 1px solid var(--rule);
  font-size: 18px;
  line-height: 1;
  vertical-align: middle;
}
.matrix tbody tr:hover td:not(.own) { background: rgba(255, 255, 255, 0.02); }
.matrix tbody tr:hover th.sticky-col { background: var(--bg); }
.matrix tbody td.own {
  background: rgba(45, 212, 191, 0.08);
  border-left: 2px solid var(--accent);
  border-right: 2px solid var(--accent);
}
.matrix tbody tr:last-child td { border-bottom: none; }
.matrix tbody tr:last-child th.sticky-col { border-bottom: none; }
.matrix tbody tr:last-child td.own {
  border-bottom: 2px solid var(--accent);
}

.cell-yes     { color: var(--green); font-weight: 700; }
.cell-no      { color: #e87070; font-weight: 700; opacity: 0.85; }
.cell-partial { color: var(--accent); font-weight: 700; font-size: 26px; line-height: 0.5; }
.cell-diff    {
  font-family: ui-monospace, monospace;
  font-size: 10.5px;
  letter-spacing: 0.06em;
  font-weight: 700;
  color: var(--accent);
}

.compare-note {
  color: var(--fg-soft);
  font-size: 14.5px;
  margin: 4px 0 28px;
  font-style: italic;
  max-width: 70ch;
}

.compare-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 16px;
  margin: 18px 0 32px;
}
.compare-card {
  background: var(--bg-soft);
  border: 1px solid var(--rule);
  border-radius: 8px;
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
}
.compare-card__head {
  margin-bottom: 12px;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--rule);
}
.compare-card__head h3 {
  margin: 0 0 6px;
  font-size: 16px;
  color: var(--fg);
}
.compare-card__head h3 code {
  font-size: 14px;
  background: transparent;
  padding: 0;
  color: var(--accent);
}
.compare-card__similar {
  display: block;
  color: var(--fg-soft);
  font-size: 13px;
  line-height: 1.45;
}
.compare-card p {
  margin: 0;
  font-size: 14.5px;
  color: var(--fg);
}

.cta-row {
  margin: 22px 0 18px;
}
.cta-button {
  display: inline-block;
  border: 1px solid var(--accent);
  border-bottom: 1px solid var(--accent);
  border-radius: 6px;
  padding: 14px 22px;
  font-weight: 600;
  font-size: 15px;
  color: var(--accent);
  background: rgba(45, 212, 191, 0.08);
}
.cta-button:hover {
  background: rgba(45, 212, 191, 0.15);
  color: var(--accent-soft);
}


/* ============ Compare page: phone fixes ============ */
@media (max-width: 900px) {
  /* Tab-strip ToC: solid background fallback (backdrop-filter is iffy on iOS),
     tighter padding, smaller pills so 4 fit on one line. */
  .compare-nav {
    padding: 10px 12px;
    gap: 6px;
    top: 0;
    background: var(--bg-soft);
    backdrop-filter: none;
  }
  .compare-nav a {
    padding: 5px 10px;
    font-size: 12.5px;
  }

  /* Legend stays compact */
  .legend {
    gap: 10px;
    font-size: 12px;
    padding: 10px 12px;
  }

  /* Carve out a top zone in the matrix-shell for the scroll-hint badge
     so it doesn't overlap the column headers. */
  .matrix-shell {
    position: relative;
    padding-top: 30px;
  }
  .matrix-shell::before {
    content: "swipe to compare \2192";
    position: absolute;
    top: 6px;
    right: 10px;
    z-index: 3;
    pointer-events: none;
    font-family: ui-monospace, monospace;
    font-size: 10px;
    letter-spacing: 0.04em;
    color: var(--accent);
    background: rgba(0, 0, 0, 0.55);
    border: 1px solid var(--accent);
    padding: 2px 8px;
    border-radius: 999px;
  }

  /* Tighten sticky column so 3 columns fit on a 390px viewport */
  .matrix tbody th.sticky-col,
  .matrix thead th.sticky-col {
    min-width: 160px;
    max-width: 180px;
    padding: 9px 10px;
    font-size: 12.5px;
    line-height: 1.3;
  }

  /* Tighter cells */
  .matrix { min-width: 720px; }
  .matrix thead th {
    padding: 10px 6px;
    font-size: 10.5px;
  }
  .matrix thead th.own { font-size: 12px; }
  .matrix tbody td {
    padding: 8px 4px;
    font-size: 15px;
  }
  .cell-partial { font-size: 22px; }
  .cell-diff { font-size: 9.5px; }

  /* Scroll-margin so the sticky tab strip doesn't cover anchored sections */
  .compare-section { scroll-margin-top: 70px; }

  /* Cards: smaller titles + tighter padding */
  .compare-cards { gap: 12px; }
  .compare-card { padding: 14px 16px; }
  .compare-card__head h3 { font-size: 15px; }
  .compare-card__similar { font-size: 12.5px; }
  .compare-card p { font-size: 13.5px; }

  /* CTA button slightly smaller */
  .cta-button { padding: 12px 18px; font-size: 14px; }
}


/* ============ Walkthrough video section ============ */

.walkthrough {
  scroll-margin-top: 110px;
  margin: 26px 0 42px;
  padding: 32px 26px 28px;
  background: var(--bg-soft);
  border: 1px solid var(--rule);
  border-left: 3px solid var(--accent);
  border-radius: 10px;
}
.walkthrough > h2 {
  margin-top: 0;
}
.walkthrough__lede {
  max-width: 64ch;
  margin: 0 0 22px;
}

.hero-video {
  margin: 0;
}
.hero-video__player {
  width: 100%;
  max-width: 980px;
  display: block;
  margin: 0 auto;
  background: #000;
  border: 1px solid var(--rule);
  border-radius: 6px;
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.45);
}
.hero-video__caption {
  margin: 14px auto 0;
  max-width: 980px;
  font-size: 14.5px;
  color: var(--fg-soft);
  font-style: italic;
}

@media (max-width: 640px) {
  .walkthrough {
    padding: 20px 14px 18px;
    border-left-width: 2px;
  }
  .hero-video__caption { font-size: 13.5px; }
}


/* ============ Architecture diagram (inline SVG) ============ */

.arch-diagram-wrap {
  margin: 16px 0 36px;
  padding: 22px 18px;
  background: var(--bg);
  border: 1px solid var(--rule);
  border-radius: 12px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.arch-diagram {
  width: 100%;
  height: auto;
  max-width: 980px;
  min-width: 720px;
  display: block;
  margin: 0 auto;
  color: var(--accent);
}

.arch-node rect {
  fill: var(--bg-soft);
  stroke: var(--rule);
  stroke-width: 1;
  filter: drop-shadow(0 4px 14px rgba(0, 0, 0, 0.28));
}
.arch-node__stripe {
  stroke: var(--accent);
  stroke-width: 5;
  stroke-linecap: round;
}
.arch-node__title {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 18px;
  font-weight: 700;
  fill: var(--accent);
}
.arch-node__title-aux {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 13px;
  font-weight: 500;
  fill: var(--fg-soft);
}
.arch-node__sub {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 13.5px;
  fill: var(--fg-soft);
}

.arch-edge {
  stroke: var(--accent);
  stroke-width: 2;
  fill: none;
}
.arch-edge__label {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 12.5px;
  fill: var(--fg-soft);
  font-style: italic;
}

@media (max-width: 640px) {
  .arch-diagram-wrap { padding: 14px 10px; }
}

/* ============ Light-mode overrides ============
   The var()-driven fills above don't reliably cascade into <svg> in
   Safari and some Firefox builds — the rects fall back to
   fill:black. And several matrix cells + shell chrome go too
   low-contrast when their dark-mode tints render against a light bg.
   These explicit values fix both. */

@media (prefers-color-scheme: light) {
  /* Architecture SVG cards */
  .arch-node rect        { fill: #ffffff; stroke: #d1d5d0; }
  .arch-node__stripe     { stroke: #0f766e; }
  .arch-node__title      { fill: #0f766e; }
  .arch-node__title-aux  { fill: #555; }
  .arch-node__sub        { fill: #555; }
  .arch-edge             { stroke: #0f766e; }
  .arch-edge__label      { fill: #555; }

  /* Compare-matrix chrome */
  .matrix-shell {
    border: 1px solid #c8ccc6;
    background: #ffffff;
    box-shadow: 0 4px 18px rgba(0, 0, 0, 0.06);
  }
  .matrix thead th            { background: #f0eee6; color: #555; }
  .matrix thead th.own        { background: rgba(15, 118, 110, 0.08); }
  .matrix thead th.sticky-col { background: #f0eee6; }
  .matrix tbody th.sticky-col { background: #ffffff; }
  .matrix tbody tr:hover td:not(.own) { background: rgba(0, 0, 0, 0.03); }
  .matrix tbody tr:hover th.sticky-col { background: #f5f4ea; }
  .matrix tbody td.own        { background: rgba(15, 118, 110, 0.06); }

  /* Compare-matrix cells */
  .cell-yes     { color: #1b7a4b; }
  .cell-no      { color: #c53030; opacity: 1; }
  .cell-partial { color: #0f766e; }

  /* Compare cards */
  .compare-card { background: #ffffff; border-color: #d1d5d0; box-shadow: 0 2px 12px rgba(0, 0, 0, 0.05); }
}