/* walstad loom — clinical landing (IBM Plex) */

@font-face { font-family: "IBM Plex Sans";  font-weight: 400; font-style: normal; font-display: swap; src: url("fonts/IBMPlexSans-Regular.woff2") format("woff2"); }
@font-face { font-family: "IBM Plex Sans";  font-weight: 500; font-style: normal; font-display: swap; src: url("fonts/IBMPlexSans-Medium.woff2") format("woff2"); }
@font-face { font-family: "IBM Plex Serif"; font-weight: 400; font-style: normal; font-display: swap; src: url("fonts/IBMPlexSerif-Regular.woff2") format("woff2"); }
@font-face { font-family: "IBM Plex Serif"; font-weight: 500; font-style: normal; font-display: swap; src: url("fonts/IBMPlexSerif-Medium.woff2") format("woff2"); }
@font-face { font-family: "IBM Plex Serif"; font-weight: 400; font-style: italic; font-display: swap; src: url("fonts/IBMPlexSerif-Italic.woff2") format("woff2"); }
@font-face { font-family: "IBM Plex Mono";  font-weight: 400; font-style: normal; font-display: swap; src: url("fonts/IBMPlexMono-Regular.woff2") format("woff2"); }
@font-face { font-family: "IBM Plex Mono";  font-weight: 500; font-style: normal; font-display: swap; src: url("fonts/IBMPlexMono-Medium.woff2") format("woff2"); }

:root {
  --bg: #f2f1ed;
  --surface: #ffffff;
  --surface-muted: #e8e7e3;
  --ink: #161616;
  --ink-secondary: #525252;
  --ink-tertiary: #6f6f6f;
  --border: #c6c6c3;
  --border-light: #dedcd7;
  --accent: #0f62fe;
  --accent-hover: #0043ce;
  --measure: 1120px;
  --gutter: clamp(16px, 4vw, 28px);
  --nav-h: 52px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 16px);
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

::selection {
  background: #d0e2ff;
  color: var(--ink);
}

body {
  margin: 0;
  background-color: var(--bg);
  background-image:
    linear-gradient(var(--border-light) 1px, transparent 1px),
    linear-gradient(90deg, var(--border-light) 1px, transparent 1px);
  background-size: 24px 24px;
  background-position: -1px -1px;
  color: var(--ink);
  font-family: "IBM Plex Sans", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
  font-family: "IBM Plex Serif", Georgia, serif;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--ink);
}

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.15s var(--ease), border-color 0.15s var(--ease);
}

a:hover { color: var(--accent-hover); border-bottom-color: var(--accent-hover); }

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

code {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.88em;
  background: var(--surface-muted);
  padding: 1px 5px;
  border: 1px solid var(--border-light);
  color: var(--ink);
}

pre {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 14px 16px;
  overflow-x: auto;
  margin: 12px 0;
  font-size: 13px;
}

pre code { background: transparent; border: none; padding: 0; }

.skip-link {
  position: absolute;
  left: -9999px;
  top: 8px;
  z-index: 100;
  padding: 8px 14px;
  background: var(--ink);
  color: var(--surface);
  font-family: "IBM Plex Mono", monospace;
  font-size: 12px;
}

.skip-link:focus { left: 8px; }

/* ---------- nav ---------- */

.site-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.88);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.site-nav-inner {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 0 var(--gutter);
  min-height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.site-brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
}

.site-mark {
  font-family: "IBM Plex Serif", Georgia, serif;
  font-size: 17px;
  font-weight: 500;
  color: var(--ink);
  letter-spacing: -0.02em;
}

.site-mark-sub {
  font-family: "IBM Plex Mono", monospace;
  font-size: 10px;
  color: var(--ink-tertiary);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.nav-toggle {
  display: none;
  padding: 8px 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  font-family: "IBM Plex Mono", monospace;
  font-size: 10px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-secondary);
  cursor: pointer;
}

#site-nav-panel {
  display: flex;
  align-items: center;
  gap: 24px;
}

.site-links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  font-family: "IBM Plex Mono", monospace;
  font-size: 10px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.site-links a {
  color: var(--ink-tertiary);
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
}

.site-links a:hover,
.site-links a.is-active {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

.photoperiod {
  font-family: "IBM Plex Mono", monospace;
  font-size: 10px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-tertiary);
  white-space: nowrap;
  padding: 4px 8px;
  border: 1px solid var(--border-light);
  background: var(--surface);
}

.photoperiod[data-phase="day"] { color: #0e6027; border-color: #a7f0ba; background: #f0fff4; }
.photoperiod[data-phase="dawn"],
.photoperiod[data-phase="dusk"] { color: #8a5700; border-color: #fddc69; background: #fffdf0; }
.photoperiod[data-phase="night"] { color: #393939; border-color: #c6c6c6; background: #f4f4f4; }

/* ---------- hero ---------- */

.hero {
  max-width: var(--measure);
  margin: 0 auto;
  padding: clamp(32px, 6vw, 56px) var(--gutter) clamp(36px, 5vw, 48px);
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.12fr);
  gap: clamp(28px, 4vw, 44px);
  align-items: start;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.hero-inner h1 {
  font-size: clamp(34px, 5.5vw, 54px);
  margin: 0 0 10px;
  line-height: 1.06;
}

.hero-deck {
  font-family: "IBM Plex Serif", Georgia, serif;
  font-size: clamp(16px, 2.2vw, 19px);
  line-height: 1.5;
  color: var(--ink-secondary);
  margin: 0 0 24px;
  max-width: 36em;
}

.spec-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  margin-bottom: 24px;
}

.spec-cell {
  background: var(--bg);
  padding: 10px 12px;
}

.spec-cell dt {
  font-family: "IBM Plex Mono", monospace;
  font-size: 9px;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--ink-tertiary);
  margin: 0 0 4px;
}

.spec-cell dd {
  margin: 0;
  font-size: 13px;
}

.spec-cell dd a {
  font-family: "IBM Plex Mono", monospace;
  font-size: 12px;
}

.downloads {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
  margin-bottom: 14px;
}

.dl-btn {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 12px 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--ink);
  transition: border-color 0.15s var(--ease), transform 0.15s var(--ease), box-shadow 0.15s var(--ease);
}

.dl-btn:hover {
  border-color: var(--ink);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(22, 22, 22, 0.06);
  border-bottom: 1px solid var(--ink);
}

.dl-icon {
  font-size: 18px;
  line-height: 1;
  opacity: 0.7;
  flex-shrink: 0;
  font-family: "IBM Plex Mono", monospace;
  font-size: 14px;
}

.dl-icon-mac::before { content: ""; font-size: 16px; }

.dl-text { min-width: 0; }

.dl-btn .platform {
  display: block;
  font-family: "IBM Plex Serif", Georgia, serif;
  font-size: 15px;
  font-weight: 500;
  margin-bottom: 2px;
}

.dl-btn .hint {
  font-family: "IBM Plex Mono", monospace;
  font-size: 10px;
  color: var(--ink-tertiary);
  letter-spacing: 0.02em;
}

.releases-link {
  font-family: "IBM Plex Mono", monospace;
  font-size: 11px;
  color: var(--ink-tertiary);
}

.releases-link a { color: var(--ink-secondary); }

.steam-panel {
  margin-top: 24px;
  padding: 18px 20px;
  background: var(--bg);
  border: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}

.steam-panel::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, #1b2838, #66c0f4, #1b2838);
  opacity: 0.55;
}

.steam-eyebrow {
  margin: 0 0 8px;
  font-family: "IBM Plex Mono", monospace;
  font-size: 9px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-tertiary);
}

.steam-lead {
  margin: 0 0 12px;
  font-size: 14px;
  color: var(--ink-secondary);
  line-height: 1.5;
}

.steam-lead strong { color: var(--ink); font-weight: 500; }

.steam-btn {
  display: inline-block;
  padding: 8px 16px;
  background: var(--ink);
  border: 1px solid var(--ink);
  color: var(--surface);
  font-family: "IBM Plex Mono", monospace;
  font-size: 10px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--ink);
  transition: background 0.15s var(--ease);
}

.steam-btn:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  border-bottom-color: var(--accent-hover);
  color: var(--surface);
}

.honest-note {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--border-light);
  font-family: "IBM Plex Serif", Georgia, serif;
  font-size: 13px;
  line-height: 1.5;
  color: var(--ink-tertiary);
  font-style: italic;
}

.hero-shot {
  margin: 0;
  border: 1px solid var(--border);
  background: #0a1218;
  position: relative;
}

.hero-shot::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-conic-gradient(rgba(255,255,255,0.03) 0% 25%, transparent 0% 50%) 0 0 / 4px 4px;
  mix-blend-mode: overlay;
  opacity: 0.35;
}

.hero-shot img,
.gallery-grid img,
.scenario-shot img {
  display: block;
  width: 100%;
  height: auto;
  image-rendering: auto;
}

.hero-shot figcaption,
.gallery-grid figcaption,
.scenario-shot figcaption {
  padding: 9px 14px;
  font-family: "IBM Plex Mono", monospace;
  font-size: 10px;
  letter-spacing: 0.03em;
  color: var(--ink-tertiary);
  background: var(--surface);
  border-top: 1px solid var(--border-light);
}

/* ---------- sections ---------- */

main {
  max-width: var(--measure);
  margin: 0 auto;
  background: var(--surface);
  border-left: 1px solid var(--border);
  border-right: 1px solid var(--border);
}

section {
  padding: clamp(36px, 5vw, 52px) var(--gutter);
  border-bottom: 1px solid var(--border);
}

section:last-of-type { border-bottom: none; }

.section-head { margin-bottom: 24px; }

h2 {
  font-size: clamp(20px, 3vw, 24px);
  margin: 0 0 6px;
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.sec-num {
  font-family: "IBM Plex Mono", monospace;
  font-size: 10px;
  font-weight: 500;
  color: var(--ink-tertiary);
  letter-spacing: 0.05em;
}

.section-lead {
  color: var(--ink-secondary);
  max-width: 50em;
  margin: 0;
  font-size: 15px;
  line-height: 1.55;
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}

.grid-3 { grid-template-columns: repeat(3, 1fr); }

.feature {
  background: var(--surface);
  padding: 18px 20px;
  transition: background 0.15s var(--ease);
}

.feature:hover { background: var(--bg); }

.feature h3 {
  margin: 0 0 6px;
  font-size: 15px;
}

.feature p {
  margin: 0;
  color: var(--ink-secondary);
  font-size: 14px;
  line-height: 1.55;
}

/* ---------- scenarios ---------- */

.scenario-shot {
  margin: 0 0 20px;
  border: 1px solid var(--border);
  background: #121820;
}

.scenario-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}

.scenario-card {
  background: var(--surface);
  padding: 14px 16px 14px 18px;
  position: relative;
  transition: background 0.15s var(--ease);
}

.scenario-card::before {
  content: "";
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: var(--scenario-accent, var(--border));
}

.scenario-card:hover { background: var(--bg); }

.scenario-card[data-scenario="jungle"]   { --scenario-accent: #2d6a4f; }
.scenario-card[data-scenario="iwagumi"]  { --scenario-accent: #868e96; }
.scenario-card[data-scenario="blackwater"] { --scenario-accent: #6b4423; }
.scenario-card[data-scenario="reef"]     { --scenario-accent: #e07a5f; }
.scenario-card[data-scenario="hex"]      { --scenario-accent: #5c4d7a; }
.scenario-card[data-scenario="polyp"]    { --scenario-accent: #c9184a; }
.scenario-card[data-scenario="column"]   { --scenario-accent: #40916c; }
.scenario-card[data-scenario="predator"] { --scenario-accent: #343a40; }

.scenario-card h3 {
  margin: 0 0 4px;
  font-size: 14px;
}

.scenario-meta {
  margin: 0 0 6px;
  font-family: "IBM Plex Mono", monospace;
  font-size: 9px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--ink-tertiary);
}

.scenario-card p:last-child {
  margin: 0;
  color: var(--ink-secondary);
  font-size: 13px;
  line-height: 1.45;
}

/* ---------- gallery ---------- */

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.gallery-grid figure {
  margin: 0;
  border: 1px solid var(--border);
  background: #0a1218;
  overflow: hidden;
  transition: border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.gallery-grid figure:hover {
  border-color: var(--ink-tertiary);
  box-shadow: 0 8px 24px rgba(22, 22, 22, 0.08);
}

.gallery-grid figure img {
  transition: transform 0.35s var(--ease);
}

.gallery-grid figure:hover img {
  transform: scale(1.02);
}

/* ---------- install ---------- */

.install-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px 28px;
}

.install-block {
  padding: 4px 0 4px 16px;
  border-left: 2px solid var(--border);
  transition: border-color 0.15s var(--ease);
}

.install-block:hover { border-left-color: var(--ink-tertiary); }

.install-block h3 {
  margin: 0 0 6px;
  font-size: 15px;
}

.install-block p {
  color: var(--ink-secondary);
  margin: 6px 0;
  font-size: 14px;
}

.install-block p.muted {
  font-size: 12px;
  color: var(--ink-tertiary);
}

/* ---------- footer + back top ---------- */

footer {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 28px var(--gutter) 40px;
  border: 1px solid var(--border);
  border-top: none;
  background: var(--surface);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
}

footer p {
  margin: 0;
  font-family: "IBM Plex Mono", monospace;
  font-size: 10px;
  letter-spacing: 0.04em;
  color: var(--ink-tertiary);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-family: "IBM Plex Mono", monospace;
  font-size: 10px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.footer-links a {
  color: var(--ink-secondary);
  border-bottom: none;
}

.footer-links a:hover { color: var(--ink); }

#back-top {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 40;
  width: 40px;
  height: 40px;
  padding: 0;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--ink-secondary);
  font-family: "IBM Plex Mono", monospace;
  font-size: 14px;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transform: translateY(8px);
  transition: opacity 0.2s var(--ease), transform 0.2s var(--ease), border-color 0.15s;
  box-shadow: 0 4px 16px rgba(22, 22, 22, 0.08);
}

#back-top.is-shown {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

#back-top:hover {
  border-color: var(--ink);
  color: var(--ink);
}

/* ---------- reveal ---------- */

.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

.reveal-delay-1 { transition-delay: 0.06s; }
.reveal-delay-2 { transition-delay: 0.12s; }
.reveal-delay-3 { transition-delay: 0.18s; }

/* ---------- responsive ---------- */

@media (max-width: 900px) {
  .nav-toggle { display: block; }

  #site-nav-panel {
    position: fixed;
    top: var(--nav-h);
    left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height 0.3s var(--ease), opacity 0.2s;
  }

  #site-nav-panel.is-open {
    max-height: 320px;
    opacity: 1;
    padding: 12px var(--gutter) 16px;
  }

  .site-links {
    flex-direction: column;
    gap: 12px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-light);
    margin-bottom: 12px;
  }

  .photoperiod { align-self: flex-start; }

  .hero { grid-template-columns: 1fr; }

  .hero-shot { order: -1; }

  .grid, .grid-3 { grid-template-columns: 1fr; }

  .scenario-grid { grid-template-columns: repeat(2, 1fr); }

  .gallery-grid { grid-template-columns: 1fr; }

  .install-grid { grid-template-columns: 1fr; }
}

@media (max-width: 520px) {
  .scenario-grid { grid-template-columns: 1fr; }
  .downloads { grid-template-columns: 1fr; }
  .spec-strip { grid-template-columns: 1fr; }
  footer { flex-direction: column; align-items: flex-start; }
}