styles.css

/* ============================================================
   FUTURE-TS — flat, minimal benchmark site.
   Editorial / Swiss: white ground, hairline rules, generous
   space, one purple accent used sparingly. No shadows, no
   gradients. Inspired by the TSFM.ai feel, built from scratch.
   ============================================================ */

:root {
  --bg: #ffffff;
  --ink: #141414;
  --ink-2: #5c5c5f;
  --ink-3: #9a9a9e;
  --line: #ececec;
  --line-2: #dadada;
  --accent: #8f46ff;
  --accent-ink: #6d28d9; /* accent at text-legible contrast */
  --max: 1120px;
  --pad: clamp(20px, 5vw, 40px);

  --font-display: "Sora", system-ui, sans-serif;
  --font-sans: "Manrope", system-ui, -apple-system, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.mono {
  font-family: var(--font-mono);
  font-variant-ligatures: none;
}

a {
  color: inherit;
}

::selection {
  background: rgba(143, 70, 255, 0.16);
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

h1,
h2,
h3 {
  font-family: var(--font-display);
  font-weight: 600;
  margin: 0;
  letter-spacing: -0.02em;
}

/* ── Header ───────────────────────────────────────────────── */
.site-header {
  align-items: center;
  background: var(--bg);
  border-bottom: 1px solid var(--line);
  display: flex;
  gap: 24px;
  height: 60px;
  margin: 0 auto;
  max-width: var(--max);
  padding: 0 var(--pad);
  position: sticky;
  top: 0;
  z-index: 10;
}

.brand {
  align-items: center;
  display: inline-flex;
  gap: 9px;
  text-decoration: none;
}

.brand-mark {
  color: var(--ink);
  height: 20px;
  width: 20px;
}
.mark-dot {
  fill: var(--accent);
}

.brand-name {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.brand-tag {
  border-left: 1px solid var(--line-2);
  color: var(--ink-3);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.02em;
  padding-left: 9px;
}

.site-nav {
  display: flex;
  gap: 22px;
  margin-left: auto;
}

.site-nav a {
  color: var(--ink-2);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  transition: color 140ms ease;
}
.site-nav a:hover {
  color: var(--ink);
}

.header-link {
  color: var(--ink);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid var(--line-2);
  padding-bottom: 1px;
  transition: border-color 140ms ease;
}
.header-link:hover {
  border-color: var(--ink);
}

/* ── Layout primitives ────────────────────────────────────── */
main {
  margin: 0 auto;
  max-width: var(--max);
  padding: 0 var(--pad);
}

/* ── Hero ─────────────────────────────────────────────────── */
.hero {
  max-width: 800px;
  padding: clamp(64px, 11vw, 132px) 0 clamp(40px, 6vw, 64px);
}

.eyebrow {
  color: var(--accent-ink);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  margin: 0 0 22px;
  text-transform: uppercase;
}

h1 {
  font-size: clamp(34px, 5.4vw, 60px);
  line-height: 1.06;
  margin: 0 0 24px;
  max-width: 17ch;
}

.lede {
  color: var(--ink-2);
  font-size: clamp(16px, 1.6vw, 19px);
  line-height: 1.6;
  margin: 0;
  max-width: 60ch;
}

.hero-actions {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 22px;
  margin-top: 36px;
}

.btn {
  background: var(--ink);
  border: 1px solid var(--ink);
  color: #fff;
  display: inline-flex;
  font-size: 14px;
  font-weight: 600;
  padding: 12px 20px;
  text-decoration: none;
  transition: background 140ms ease, border-color 140ms ease;
}
.btn:hover {
  background: #000;
  border-color: #000;
}

.link-arrow {
  color: var(--ink);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  display: inline-flex;
  gap: 7px;
  align-items: center;
}
.link-arrow span {
  color: var(--accent-ink);
  transition: transform 160ms ease;
}
.link-arrow:hover span {
  transform: translateX(3px);
}

/* ── Series illustration ──────────────────────────────────── */
.series {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  margin: 0;
}

#series-svg {
  display: block;
  height: clamp(160px, 22vw, 240px);
  width: 100%;
}

.series-caption {
  border-top: 1px solid var(--line);
  color: var(--ink-3);
  display: flex;
  font-size: 11px;
  justify-content: space-between;
  letter-spacing: 0.04em;
  padding: 11px 2px;
  text-transform: uppercase;
}
.series-caption .accent {
  color: var(--accent-ink);
}

/* ── Stats ────────────────────────────────────────────────── */
.stats {
  border-bottom: 1px solid var(--line);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}

.stats div {
  border-right: 1px solid var(--line);
  padding: clamp(28px, 4vw, 44px) 28px clamp(28px, 4vw, 44px) 0;
}
.stats div:not(:first-child) {
  padding-left: 28px;
}
.stats div:last-child {
  border-right: 0;
  padding-right: 0;
}

.stat-num {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(32px, 4.4vw, 48px);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1;
}

.stat-label {
  color: var(--ink-3);
  display: block;
  font-size: 11px;
  letter-spacing: 0.03em;
  margin-top: 12px;
  text-transform: uppercase;
}

/* ── Content blocks ───────────────────────────────────────── */
.block {
  border-bottom: 1px solid var(--line);
  padding: clamp(52px, 7vw, 88px) 0;
}

.block-head {
  max-width: 680px;
}

.kicker {
  color: var(--ink-3);
  font-size: 11px;
  letter-spacing: 0.12em;
  margin: 0 0 16px;
  text-transform: uppercase;
}

h2 {
  font-size: clamp(26px, 3.4vw, 38px);
  line-height: 1.12;
  margin: 0;
}

.block-sub {
  color: var(--ink-2);
  font-size: 17px;
  line-height: 1.6;
  margin: 16px 0 0;
}

/* contract grid — flat, hairline separators, no cards */
.grid-4 {
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin-top: clamp(40px, 5vw, 64px);
}

.grid-4 article {
  border-right: 1px solid var(--line);
  padding: 32px 28px 32px 0;
}
.grid-4 article:first-child {
  padding-left: 0;
}
.grid-4 article:not(:first-child) {
  padding-left: 28px;
}
.grid-4 article:last-child {
  border-right: 0;
  padding-right: 0;
}

.idx {
  color: var(--accent-ink);
  display: block;
  font-size: 12px;
  margin-bottom: 22px;
}

.grid-4 h3 {
  font-size: 17px;
  font-weight: 600;
  margin: 0 0 10px;
}

.grid-4 p {
  color: var(--ink-2);
  font-size: 14px;
  line-height: 1.6;
  margin: 0;
}

code {
  background: #f4f2f8;
  border-radius: 4px;
  color: var(--accent-ink);
  font-family: var(--font-mono);
  font-size: 0.86em;
  padding: 0.1em 0.36em;
}

/* ── Leaderboard ──────────────────────────────────────────── */
.board {
  border-collapse: collapse;
  margin-top: clamp(28px, 3.5vw, 44px);
  width: 100%;
}

.board th {
  border-bottom: 1px solid var(--line-2);
  color: var(--ink-3);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.06em;
  padding: 0 14px 12px 0;
  text-align: left;
  text-transform: uppercase;
}

.board td {
  border-bottom: 1px solid var(--line);
  font-size: 13.5px;
  padding: 8px 14px 8px 0;
}

.board tr:last-child td {
  border-bottom: 0;
}

.board tbody tr {
  transition: background 120ms ease;
}
.board tbody tr:hover td {
  background: rgba(143, 70, 255, 0.04);
}

.board .rank {
  color: var(--ink-3);
  font-size: 12px;
  width: 48px;
}
.board .model {
  color: var(--ink);
}
.board .tier {
  color: var(--ink-3);
  font-size: 12px;
  width: 60px;
}
.board th.num,
.board td.num {
  color: var(--ink);
  font-weight: 500;
  padding-right: 0;
  text-align: right;
  white-space: nowrap;
  width: 116px;
}
.board .num.neg {
  color: var(--ink-3);
  font-weight: 400;
}

.board .pareto {
  color: var(--accent);
  font-size: 9px;
  margin-left: 3px;
  vertical-align: middle;
}

.board tbody tr:first-child .rank {
  color: var(--accent-ink);
}
.board tbody tr:first-child .model,
.board tbody tr:first-child .num {
  font-weight: 700;
}

.board-note {
  color: var(--ink-3);
  font-size: 11px;
  letter-spacing: 0.02em;
  line-height: 1.5;
  margin: 14px 0 0;
}
.board-note .pareto-key {
  color: var(--accent);
}

.board-links {
  display: flex;
  flex-wrap: wrap;
  gap: 26px;
  margin-top: 32px;
}
.board-links a,
.scope-links a {
  color: var(--ink);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid var(--line-2);
  padding-bottom: 2px;
  transition: border-color 140ms ease, color 140ms ease;
}
.board-links a:hover,
.scope-links a:hover {
  border-color: var(--accent);
  color: var(--accent-ink);
}

/* ── Steps ────────────────────────────────────────────────── */
.steps {
  border-top: 1px solid var(--line);
  counter-reset: none;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  list-style: none;
  margin: clamp(40px, 5vw, 64px) 0 0;
  padding: 0;
}

.steps li {
  border-right: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 32px 28px 0 0;
}
.steps li:not(:first-child) {
  padding-left: 28px;
}
.steps li:first-child {
  padding-left: 0;
}
.steps li:last-child {
  border-right: 0;
  padding-right: 0;
}

.steps li span:last-child {
  color: var(--ink-2);
  font-size: 14px;
  line-height: 1.6;
}

/* ── Scope ────────────────────────────────────────────────── */
.scope-links {
  display: flex;
  flex-wrap: wrap;
  gap: 28px;
  margin-top: clamp(36px, 4vw, 52px);
}

/* ── Footer ───────────────────────────────────────────────── */
footer {
  color: var(--ink-3);
  display: flex;
  flex-wrap: wrap;
  font-size: 12px;
  gap: 20px;
  justify-content: space-between;
  margin: 0 auto;
  max-width: var(--max);
  padding: 28px var(--pad) 40px;
}

footer a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--line-2);
  padding-bottom: 1px;
  transition: color 140ms ease, border-color 140ms ease;
}
footer a:hover {
  color: var(--accent-ink);
  border-color: var(--accent);
}

/* ── Responsive ───────────────────────────────────────────── */
@media (max-width: 820px) {
  .site-nav {
    display: none;
  }
  .grid-4,
  .steps {
    grid-template-columns: repeat(2, 1fr);
  }
  .grid-4 article,
  .steps li {
    border-bottom: 1px solid var(--line);
    padding-bottom: 32px;
  }
  .grid-4 article:nth-child(2),
  .steps li:nth-child(2) {
    border-right: 0;
  }
  .grid-4 article:nth-child(odd),
  .steps li:nth-child(odd) {
    padding-left: 0;
  }
  .grid-4 article:nth-child(even),
  .steps li:nth-child(even) {
    padding-left: 28px;
  }
}

@media (max-width: 540px) {
  .stats {
    grid-template-columns: repeat(2, 1fr);
  }
  .stats div:nth-child(2) {
    border-right: 0;
  }
  .stats div:nth-child(-n + 2) {
    border-bottom: 1px solid var(--line);
  }
  .stats div:nth-child(odd) {
    padding-left: 0;
  }
  .stats div:nth-child(even) {
    padding-left: 28px;
    padding-right: 0;
  }
  .grid-4,
  .steps {
    grid-template-columns: 1fr;
  }
  .grid-4 article,
  .steps li {
    border-right: 0;
    padding-left: 0 !important;
  }
  /* drop the secondary Tier column on small screens for legibility */
  .board th:nth-child(3),
  .board td:nth-child(3) {
    display: none;
  }
  .board td.num,
  .board th.num {
    width: 100px;
  }
  .board .rank {
    width: 44px;
  }
}

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