/* Subsurface project website — plain static CSS, no build step. */

:root {
  --void: #17130f;
  --bg: #14110e;
  --panel: #1e1a16;
  --panel-2: #262019;
  --line: #372e26;
  --clay: #8c4a32;
  --sand: #c9a26b;
  --slate: #5a6b78;
  --fluid: #2fd4c4;
  --crystal: #f6e8a0;
  --ink: #ece3d8;
  --ink-dim: #a89880;
  --ink-faint: #7d6e5c;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", Helvetica, Arial,
    sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  width: 100%;
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

a {
  color: var(--fluid);
  text-decoration-color: rgba(47, 212, 196, 0.35);
  text-underline-offset: 3px;
}

a:hover {
  text-decoration-color: var(--fluid);
}

h1,
h2,
h3 {
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 0 0 0.5em;
}

h2 {
  font-size: 1.9rem;
  margin-top: 0;
}

h3 {
  font-size: 1.15rem;
}

p {
  margin: 0 0 1em;
}

/* ---------- instrument-panel labels (spec §3.1: minimal, technical) ------- */

.eyebrow {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin: 0 0 0.9em;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--sand);
  border: 1px solid var(--line);
  border-radius: 100px;
  padding: 5px 13px;
  background: var(--panel);
}

.pill::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--sand);
}

/* ---------- header ------------------------------------------------------- */

header {
  border-bottom: 1px solid var(--line);
  padding: 64px 0 0;
  background: radial-gradient(
    120% 90% at 50% 0%,
    rgba(47, 212, 196, 0.07),
    transparent 62%
  );
}

.title {
  font-size: clamp(2.6rem, 7vw, 4.2rem);
  margin: 18px 0 12px;
}

.tagline {
  font-size: 1.2rem;
  color: var(--ink-dim);
  max-width: 46ch;
  margin-bottom: 22px;
}

.header-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 48px;
}

.btn {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  padding: 10px 18px;
  border-radius: 6px;
  border: 1px solid var(--line);
  color: var(--ink);
  text-decoration: none;
  background: var(--panel);
}

.btn:hover {
  border-color: var(--fluid);
  color: var(--fluid);
}

.btn-primary {
  background: var(--fluid);
  color: #08201e;
  border-color: var(--fluid);
  font-weight: 600;
}

.btn-primary:hover {
  background: #4ce4d5;
  color: #08201e;
}

/* ---------- mockup notice ------------------------------------------------ */

.notice {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  border: 1px solid var(--line);
  border-left: 3px solid var(--sand);
  border-radius: 4px;
  background: var(--panel);
  padding: 16px 20px;
  margin: 40px 0 0;
  font-size: 0.94rem;
  color: var(--ink-dim);
}

.notice strong {
  color: var(--sand);
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  white-space: nowrap;
  padding-top: 2px;
}

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

section {
  padding: 72px 0;
  border-bottom: 1px solid var(--line);
}

.lede {
  font-size: 1.12rem;
  color: var(--ink-dim);
  max-width: 62ch;
}

.cols {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 28px;
  margin-top: 36px;
}

.card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  padding: 22px;
}

.card h3 {
  margin-bottom: 6px;
}

.card p:last-child {
  margin-bottom: 0;
}

.card p {
  font-size: 0.95rem;
  color: var(--ink-dim);
}

/* ---------- figures ------------------------------------------------------ */

figure {
  margin: 0;
}

figcaption {
  font-size: 0.88rem;
  color: var(--ink-faint);
  margin-top: 14px;
  line-height: 1.55;
}

.mock-tag {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--bg);
  background: var(--sand);
  border-radius: 3px;
  padding: 2px 7px;
  margin-right: 8px;
  vertical-align: 1px;
}

.hero-figure {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 8px 0 0;
}

.hero-figure svg {
  width: 100%;
  max-width: 880px;
  height: auto;
}

.hero-figure figcaption {
  max-width: 62ch;
  text-align: center;
}

.compare {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 32px;
  margin-top: 36px;
}

.compare svg {
  width: 100%;
  height: auto;
  border-radius: 10px;
  display: block;
  border: 1px solid var(--line);
}

.compare h3 {
  font-family: var(--mono);
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 14px;
}

.compare .outcome {
  margin-top: 14px;
  font-size: 0.95rem;
}

.outcome .bad {
  color: #d98b6a;
  font-family: var(--mono);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
}

.outcome .good {
  color: var(--fluid);
  font-family: var(--mono);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
}

/* ---------- materials ---------------------------------------------------- */

.materials {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(232px, 1fr));
  gap: 22px;
  margin-top: 36px;
}

.mat {
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  background: var(--panel);
}

.mat svg {
  display: block;
  width: 100%;
  height: auto;
}

.mat-body {
  padding: 18px 20px 20px;
}

.mat-body h3 {
  margin-bottom: 10px;
}

.mat-body dl {
  margin: 0;
  font-size: 0.9rem;
}

.mat-body dt {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-top: 10px;
}

.mat-body dd {
  margin: 2px 0 0;
  color: var(--ink-dim);
  line-height: 1.5;
}

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

.env {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  padding: 24px;
  margin-top: 22px;
}

.env-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 6px;
}

.env-head h3 {
  margin: 0;
}

.env-state {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 3px 9px;
  border-radius: 3px;
  border: 1px solid var(--line);
  color: var(--ink-faint);
}

.env-state.ready {
  color: var(--fluid);
  border-color: rgba(47, 212, 196, 0.4);
}

.env-state.blocked {
  color: #d98b6a;
  border-color: rgba(217, 139, 106, 0.4);
}

pre {
  background: var(--void);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 14px 16px;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 0.84rem;
  line-height: 1.7;
  color: var(--ink);
  margin: 14px 0;
}

pre .c {
  color: var(--ink-faint);
}

code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--panel-2);
  border-radius: 3px;
  padding: 1px 5px;
}

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

.why {
  font-size: 0.92rem;
  color: var(--ink-dim);
  border-left: 2px solid var(--line);
  padding-left: 14px;
  margin: 14px 0 0;
}

.why b {
  color: var(--sand);
  font-weight: 600;
}

/* ---------- table -------------------------------------------------------- */

.table-scroll {
  overflow-x: auto;
  margin-top: 32px;
  border: 1px solid var(--line);
  border-radius: 8px;
}

table {
  border-collapse: collapse;
  width: 100%;
  min-width: 540px;
  font-size: 0.94rem;
}

th,
td {
  text-align: left;
  padding: 13px 18px;
  border-bottom: 1px solid var(--line);
}

th {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--ink-faint);
  background: var(--panel-2);
}

tbody tr:last-child td {
  border-bottom: none;
}

td .st {
  font-family: var(--mono);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
}

.st.done {
  color: var(--fluid);
}

.st.todo {
  color: var(--ink-faint);
}

.st.open {
  color: var(--sand);
}

/* ---------- footer ------------------------------------------------------- */

footer {
  padding: 44px 0 64px;
  color: var(--ink-faint);
  font-size: 0.9rem;
}

footer p {
  margin: 0 0 6px;
}

ul.tight {
  margin: 0 0 1em;
  padding-left: 1.2em;
  color: var(--ink-dim);
}

ul.tight li {
  margin-bottom: 6px;
}

@media (max-width: 620px) {
  body {
    font-size: 16px;
  }
  section {
    padding: 52px 0;
  }
  .notice {
    flex-direction: column;
    gap: 8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}