/* Abax landing page. Palette from docs/internals.md: paper, ink, lacquered walnut,
   bone, one vermilion accent. Light by default, dark by system preference. */

:root {
  --paper: #f4ede0;
  --paper-2: #eadfcc;
  --paper-3: #e2d4bd;
  --ink: #2a2320;
  --ink-soft: #6e6259;
  --line: #d6c7ad;
  --accent: #c2452d;
  --accent-ink: #fffaf3;
  --accent-text: #a83a25;
  --walnut: #3b2a1e;
  --walnut-light: #6b4a2e;
  --walnut-deep: #24180f;
  --bone: #efe6d6;
  --shadow: rgba(42, 35, 32, 0.18);

  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, Ubuntu, "Noto Sans", sans-serif;
  --mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, "DejaVu Sans Mono", monospace;

  --measure: 68rem;
  --gutter: 16px;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #1c1a17;
    --paper-2: #26221e;
    --paper-3: #2f2924;
    --ink: #ede6da;
    --ink-soft: #a69c90;
    --line: #3a332c;
    --accent: #d8563b;
    --accent-ink: #1c1a17;
    --accent-text: #e98a72;
    --walnut: #2c1f16;
    --walnut-light: #4a3424;
    --walnut-deep: #140d08;
    --bone: #e6dac4;
    --shadow: rgba(0, 0, 0, 0.45);
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.6;
  font-variant-numeric: tabular-nums;
  overflow-x: hidden;
}

img,
video {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--accent-text);
  text-underline-offset: 0.15em;
}

a:hover {
  text-decoration-thickness: 2px;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

h1,
h2 {
  font-family: var(--serif);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: 0.002em;
  margin: 0 0 0.5em;
  text-wrap: balance;
}

h1 {
  font-size: clamp(1.9rem, 4.6vw, 3.1rem);
  max-width: 22ch;
}

h2 {
  font-size: clamp(1.45rem, 3vw, 2rem);
}

.wrap {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

@media (min-width: 720px) {
  :root {
    --gutter: 32px;
  }
}

section {
  padding: 3.5rem 0;
}

section + section {
  border-top: 1px solid var(--line);
}

/* ------------------------------------------------------------------ top */

.top {
  border-bottom: 1px solid var(--line);
  background: var(--paper);
}

.top-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 56px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--ink);
  text-decoration: none;
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.25rem;
}

.brand img {
  border-radius: 6px;
}

.top nav {
  display: flex;
  gap: 1.1rem;
  flex-wrap: wrap;
}

.top nav a {
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 0.97rem;
}

.top nav a:hover {
  color: var(--ink);
}

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

.hero {
  padding-top: 3rem;
}

.lede {
  font-size: 1.15rem;
  color: var(--ink-soft);
  max-width: 40rem;
  margin: 0 0 1.5rem;
}

.cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 0 0 2.25rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0.55rem 1.2rem;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--paper-2);
  color: var(--ink);
  text-decoration: none;
  font-weight: 600;
}

.btn:hover {
  background: var(--paper-3);
  text-decoration: none;
}

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
}

.btn-primary:hover {
  background: var(--accent);
  filter: brightness(1.06);
}

/* The lacquered tray the soroban sits on: dark walnut with fine grain, a
   lit top bevel and a soft sheen, like the frame the app draws. */
.panel {
  margin: 0;
  padding: clamp(10px, 2.2vw, 22px);
  border-radius: 14px;
  background:
    linear-gradient(160deg, rgba(255, 240, 220, 0.10) 0%, rgba(255, 240, 220, 0) 38%, rgba(0, 0, 0, 0.18) 100%),
    repeating-linear-gradient(178deg, rgba(0, 0, 0, 0) 0 7px, rgba(0, 0, 0, 0.09) 7px 8px, rgba(0, 0, 0, 0) 8px 19px, rgba(255, 220, 180, 0.04) 19px 20px),
    repeating-linear-gradient(181deg, rgba(0, 0, 0, 0) 0 31px, rgba(0, 0, 0, 0.12) 31px 33px),
    linear-gradient(180deg, var(--walnut-light) 0%, var(--walnut) 18%, var(--walnut-deep) 100%);
  box-shadow:
    inset 0 1px 0 rgba(255, 235, 210, 0.22),
    inset 0 -2px 0 rgba(0, 0, 0, 0.35),
    0 1px 2px var(--shadow),
    0 18px 40px -18px var(--shadow);
}

.hero-media {
  width: 100%;
  aspect-ratio: 976 / 370;
  border-radius: 6px;
  background: var(--walnut-deep);
}

.facts {
  margin: 1.5rem 0 0;
  color: var(--ink-soft);
  font-size: 1rem;
}

/* ---------------------------------------------------------------- shots */

.shots {
  display: grid;
  gap: 1.75rem;
  grid-template-columns: 1fr;
  margin: 1.5rem 0 2rem;
}

@media (min-width: 860px) {
  .shots {
    grid-template-columns: repeat(3, 1fr);
  }
}

figure {
  margin: 0;
}

.shots img,
.finish-row img {
  border-radius: 10px;
  border: 1px solid var(--line);
  box-shadow: 0 10px 28px -16px var(--shadow);
}

figcaption {
  margin-top: 0.75rem;
  color: var(--ink-soft);
  font-size: 0.97rem;
}

figcaption strong {
  color: var(--ink);
}

.aside,
.sub {
  color: var(--ink-soft);
  max-width: 44rem;
}

.sub {
  margin: 0 0 1.5rem;
}

/* ----------------------------------------------------------- curriculum */

.stages {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
  grid-template-columns: 1fr;
  counter-reset: stage;
}

@media (min-width: 600px) {
  .stages {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 980px) {
  .stages {
    grid-template-columns: repeat(3, 1fr);
  }
}

.stages > li {
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.9rem 1rem 1rem;
  border-top: 3px solid var(--walnut-light);
}

.stages > li:last-child {
  border-top-color: var(--accent);
}

.stage {
  display: block;
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.08rem;
  margin-bottom: 0.4rem;
}

.stages ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.stages ul li {
  padding: 0.12rem 0;
  font-size: 0.97rem;
}

.stages b {
  display: inline-block;
  min-width: 2.6em;
  font-family: var(--mono);
  font-weight: 600;
  font-size: 0.88em;
  color: var(--accent-text);
}

.more {
  margin: 1.25rem 0 0;
}

/* ------------------------------------------------------------- finishes */

.finish-row {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(3, 1fr);
  margin: 1.25rem 0 1.25rem;
}

@media (max-width: 600px) {
  .finish-row {
    grid-template-columns: 1fr;
    max-width: 26rem;
  }
}

.finish-row figcaption {
  font-size: 0.92rem;
}

/* ------------------------------------------------------------- download */

.release {
  color: var(--ink-soft);
  margin: 0 0 1.25rem;
}

.release strong {
  color: var(--ink);
}

.dl-grid {
  display: grid;
  gap: 0.75rem;
  grid-template-columns: 1fr;
}

@media (min-width: 560px) {
  .dl-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 900px) {
  .dl-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.dl {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  min-height: 64px;
  padding: 0.8rem 1rem;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--paper-2);
  color: var(--ink);
  text-decoration: none;
}

.dl:hover {
  background: var(--paper-3);
}

.dl-name {
  font-weight: 600;
}

.dl-meta {
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.dl.is-mine {
  border: 2px solid var(--accent);
  padding: calc(0.8rem - 1px) calc(1rem - 1px);
  background: var(--paper);
}

.dl.is-mine .dl-name::after {
  content: "  your system";
  font-weight: 400;
  font-size: 0.82rem;
  color: var(--accent-text);
  white-space: pre;
}

.dl-note {
  margin: 1rem 0 0;
  color: var(--ink-soft);
}

.fine {
  color: var(--ink-soft);
  font-size: 0.93rem;
  margin: 1.25rem 0 0;
  max-width: 50rem;
}

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

.foot {
  border-top: 1px solid var(--line);
  background: var(--paper-2);
  color: var(--ink-soft);
  font-size: 0.93rem;
}

.foot-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem 2rem;
  padding-top: 1.5rem;
  padding-bottom: 1.5rem;
}

.foot p {
  margin: 0;
}

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