:root {
  --ink: #16181c;
  --ink-soft: #5a606b;
  --ink-faint: #9aa1ad;
  --paper: #f5f5f4;
  --paper-deep: #ebebe9;
  --line: #d8d8d6;
  --accent: #d44318;
  --accent-deep: #b03812;
  --accent-soft: rgba(212, 67, 24, 0.08);
  --max-w: 1080px;
  --content-w: 760px;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Monaco, "Cascadia Mono", Consolas, monospace;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  font-feature-settings: "ss01", "cv11";
}

::selection { background: var(--accent); color: #fff; }

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

.wrap {
  max-width: var(--max-w);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

/* === topbar ============================================================ */
.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(245, 245, 244, 0.92);
  backdrop-filter: saturate(140%) blur(8px);
  -webkit-backdrop-filter: saturate(140%) blur(8px);
  border-bottom: 1px solid var(--line);
}
.topbar .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}
.mark {
  font-weight: 700;
  letter-spacing: -0.01em;
  font-size: 1rem;
}
.mark-name { color: var(--ink); }
.mark-pro {
  color: var(--accent);
  margin-left: 0.15em;
}
.topbar-links {
  display: flex;
  align-items: center;
  gap: 1.4rem;
}
.topbar-link {
  font-size: 0.88rem;
  color: var(--ink-soft);
  border-bottom: none;
  font-weight: 500;
}
.topbar-link:hover {
  color: var(--accent);
}
.topbar-cta {
  font-size: 0.88rem;
  color: var(--ink);
  border-bottom: 1px solid var(--line);
  font-weight: 500;
}
.topbar-cta:hover {
  color: var(--accent);
  border-color: var(--accent);
}

/* === hero ============================================================== */
.hero {
  position: relative;
  width: 100%;
  background: var(--ink);
  overflow: hidden;
}
.hero-img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 70vh;
  object-fit: cover;
}
.hero-meta {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 0.65rem 1.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.4rem;
  background: linear-gradient(to top, rgba(0,0,0,0.55), rgba(0,0,0,0));
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.02em;
  color: rgba(255,255,255,0.86);
}
.meta-tag::before {
  content: "//";
  margin-right: 0.45em;
  color: var(--accent);
  opacity: 0.95;
}

/* === claim ============================================================= */
.claim {
  margin-top: 4.5rem;
  margin-bottom: 3.5rem;
  max-width: var(--content-w);
}
.claim h1 {
  font-size: clamp(1.9rem, 4.2vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.05;
  margin: 0 0 1.25rem;
}
.claim .lead {
  font-size: 1.18rem;
  color: var(--ink-soft);
  margin: 0;
}
.claim strong { color: var(--ink); font-weight: 600; }

/* === section labels ==================================================== */
.section-label {
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin: 0 0 1.25rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--line);
}
.section-label::before {
  content: "// ";
  color: var(--accent);
}

/* === specs strip ======================================================= */
.specs {
  margin-bottom: 4.5rem;
}
.specs-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.spec {
  padding: 1.4rem 1.2rem;
  border-right: 1px solid var(--line);
}
.spec:last-child { border-right: none; }
.spec-num {
  font-family: var(--mono);
  font-size: 1.55rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin-bottom: 0.3rem;
  line-height: 1.1;
}
.spec-label {
  font-size: 0.78rem;
  color: var(--ink-soft);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* === mechanism / diagram =============================================== */
.mechanism {
  margin-bottom: 4rem;
  max-width: var(--content-w);
}
.mechanism p,
.install p {
  color: var(--ink-soft);
  font-size: 1.02rem;
  margin: 0 0 1.5rem;
}
.install {
  margin-bottom: 4rem;
  max-width: var(--content-w);
}
.install .section-label {
  margin-top: 2.5rem;
}
.install .section-label:first-of-type {
  margin-top: 0;
}
.kit-list {
  list-style: none;
  padding: 0;
  margin: 0 0 2rem;
  display: grid;
  gap: 0.75rem;
  counter-reset: kit;
}
.kit-list li {
  position: relative;
  padding: 0.85rem 0.95rem 0.85rem 2.4rem;
  border: 1px solid var(--line);
  background: #fff;
  font-size: 0.97rem;
  color: var(--ink-soft);
  line-height: 1.5;
}
.kit-list li::before {
  content: counter(kit, decimal-leading-zero);
  counter-increment: kit;
  position: absolute;
  left: 0.85rem;
  top: 0.92rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--accent);
  font-weight: 600;
}
.kit-list strong {
  color: var(--ink);
  font-weight: 600;
}
.install strong {
  color: var(--ink);
  font-weight: 600;
}
.diagram {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 1rem;
  align-items: stretch;
  margin-top: 1rem;
}
.diagram-cell {
  border: 1px solid var(--line);
  background: #fff;
  padding: 1.2rem 1.1rem;
  font-family: var(--mono);
  font-size: 0.85rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  color: var(--ink-faint);
}
.diagram-disc {
  margin: 1.1rem auto 0;
  width: 100%;
  max-width: 110px;
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}
.diagram-disc svg {
  display: block;
  width: 100%;
  height: 100%;
  color: var(--ink-soft);
}
.diagram-cell.hi .diagram-disc svg {
  color: var(--accent);
}
.diagram-cell.hi {
  border-color: var(--accent);
  box-shadow: inset 0 0 0 1px var(--accent);
  background: var(--accent-soft);
}
.diagram-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--ink-faint);
}
.diagram-cell.hi .diagram-label {
  color: var(--accent);
  font-weight: 600;
}
.diagram-stat {
  font-size: 1rem;
  color: var(--ink);
  font-weight: 600;
}
.diagram-frame {
  font-size: 0.8rem;
  color: var(--ink-soft);
}
.diagram-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--mono);
  font-size: 1.6rem;
  color: var(--accent);
  font-weight: 400;
  padding: 0 0.5rem;
}

/* === gallery =========================================================== */
.gallery {
  margin: 0 0 4rem;
  background: #efeeec;
  padding: 2.5rem 0 2.75rem;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.gallery .frame {
  margin: 0 auto 1.6rem;
  max-width: var(--max-w);
  padding: 0 1.5rem;
}
.gallery .frame:last-of-type { margin-bottom: 0; }
.gallery .frame img {
  display: block;
  width: 100%;
  height: auto;
  background: var(--ink);
}
.gallery figcaption {
  margin-top: 0.55rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  color: var(--ink-soft);
  text-align: right;
}
.gallery figcaption::before {
  content: "// ";
  color: var(--accent);
}

/* === format comparison table =========================================== */
.format {
  margin-bottom: 4rem;
  max-width: var(--content-w);
}
.format table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}
.format th, .format td {
  text-align: left;
  padding: 0.7rem 0.9rem 0.7rem 0;
  border-bottom: 1px solid var(--line);
}
.format th {
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-soft);
  font-weight: 500;
  border-bottom-color: var(--ink);
}
.format .num {
  font-family: var(--mono);
  text-align: right;
  font-variant-numeric: tabular-nums;
}
.format tr.hi td {
  background: var(--accent-soft);
  font-weight: 600;
  color: var(--ink);
}
.format tr.hi td:first-child {
  border-left: 2px solid var(--accent);
  padding-left: 0.7rem;
}

/* === status ============================================================ */
.status {
  margin-bottom: 3rem;
  max-width: var(--content-w);
}
.status p {
  font-size: 1.02rem;
  color: var(--ink-soft);
  margin: 0;
}

/* === signup ============================================================ */
.signup {
  margin-bottom: 4.5rem;
  max-width: var(--content-w);
}
.signup form {
  border: 1px solid var(--line);
  background: #fff;
  padding: 1.4rem 1.4rem 1.2rem;
}
.signup label {
  display: block;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: 0.55rem;
}
.signup label::before {
  content: "// ";
  color: var(--accent);
}
.signup .row {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
}
.signup input[type="email"] {
  flex: 1 1 240px;
  min-width: 0;
  padding: 0.78rem 0.95rem;
  font-family: var(--sans);
  font-size: 1rem;
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink);
  border-radius: 0;
}
.signup input[type="email"]:focus {
  outline: 2px solid var(--accent);
  outline-offset: -1px;
  border-color: var(--accent);
}
.signup button {
  padding: 0.78rem 1.6rem;
  font-family: var(--sans);
  font-size: 0.98rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #fff;
  cursor: pointer;
  border-radius: 0;
  transition: background 0.12s;
}
.signup button:hover { background: var(--accent-deep); border-color: var(--accent-deep); }
.signup button:active { transform: translateY(1px); }
.signup button:disabled { opacity: 0.5; cursor: progress; }

.form-msg {
  min-height: 1.4em;
  margin: 0.7rem 0 0.1rem;
  font-size: 0.92rem;
}
.form-msg.ok { color: #1f6b3a; }
.form-msg.err { color: var(--accent-deep); }

.fineprint {
  margin: 0.6rem 0 0;
  font-size: 0.84rem;
  color: var(--ink-faint);
}

/* === install page ====================================================== */
.kicker {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 0.5rem;
}
.kicker::before { content: "// "; }

.instr-h3 {
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: -0.005em;
  color: var(--ink);
  margin: 1.6rem 0 0.6rem;
}

.kit-list.plain { counter-reset: none; }
.kit-list.plain li::before { content: "—"; color: var(--accent); }

.steps {
  list-style: none;
  counter-reset: step;
  padding: 0;
  margin: 0 0 1.4rem;
}
.steps > li {
  position: relative;
  padding: 0 0 1rem 2.4rem;
  font-size: 1rem;
  color: var(--ink);
  line-height: 1.55;
  counter-increment: step;
}
.steps > li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0.05rem;
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--accent);
  font-weight: 600;
  letter-spacing: 0.04em;
}
.steps ul {
  margin: 0.5rem 0 0 1rem;
  padding-left: 0.4rem;
  color: var(--ink-soft);
}
.steps ul li { padding-bottom: 0.35rem; }
.steps em {
  color: var(--ink-soft);
  font-style: italic;
}

.instr-callout {
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  padding: 0.85rem 1rem;
  margin: 1.5rem 0;
  font-size: 0.97rem;
  color: var(--ink);
}
.instr-callout strong { font-weight: 600; }

.divider {
  max-width: var(--content-w);
  margin: 1rem auto;
  border: 0;
  border-top: 1px dashed var(--line);
  height: 0;
}

/* === footer ============================================================ */
footer {
  border-top: 1px solid var(--line);
  padding-top: 1.5rem;
  padding-bottom: 2.5rem;
  font-size: 0.85rem;
  color: var(--ink-soft);
  max-width: var(--content-w);
}
footer p { margin: 0 0 0.6rem; }
footer a { border-bottom-style: dotted; }
.disclaimer {
  font-size: 0.78rem;
  color: var(--ink-faint);
  margin-top: 0.3rem !important;
}

/* === responsive ======================================================== */
@media (max-width: 720px) {
  .specs-grid { grid-template-columns: repeat(2, 1fr); }
  .spec { border-right: none; border-bottom: 1px solid var(--line); }
  .spec:nth-child(odd) { border-right: 1px solid var(--line); }
  .spec:nth-last-child(-n+2) { border-bottom: none; }
  .spec:last-child { border-right: none; }
  .diagram {
    grid-template-columns: 1fr;
  }
  .diagram-arrow {
    transform: rotate(90deg);
    padding: 0.25rem 0;
  }
  .hero-meta {
    font-size: 0.7rem;
    gap: 0.3rem 1rem;
  }
}

@media (max-width: 480px) {
  .wrap { padding-left: 1.1rem; padding-right: 1.1rem; }
  .claim { margin-top: 3rem; margin-bottom: 2.5rem; }
  .gallery .frame { padding: 0 1.1rem; }
}