/* ARVE landing — the app's own «Импульс» tokens, transcribed from
   app/lib/concepts/impulse/theme.dart. A black room, one acid light in it,
   and nothing round anywhere. */

:root {
  --page: #07080b;
  --block: #0e1016;
  --block-hot: #161a22;
  --rule: #1d222c;
  --accent: #d8ff33;
  --accent-down: #aecc22;
  --hot: #ff4a2b;
  --warn: #ffb020;
  --done: #6fe39b;
  --text: #f4f6f8;
  --muted: #79839a;
  --dead: #39404e;

  --gutter: 20px;
  --max: 1180px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  border-radius: 0; /* nothing in this concept is round */
}

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

body {
  margin: 0;
  background: var(--page);
  color: var(--text);
  font-family: Roboto, "Helvetica Neue", Helvetica, Arial, system-ui, sans-serif;
  font-size: 16px;
  font-weight: 500;
  line-height: 1.35;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: var(--accent);
  text-decoration: none;
}

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

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

/* ---------------------------------------------------------------- layout */

.wrap {
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.rule {
  height: 1px;
  background: var(--rule);
  border: 0;
  margin: 0;
}

section {
  padding: 56px 0;
}

/* The bar is sticky, so an anchored section must stop below it, not under it. */
section[id] {
  scroll-margin-top: 62px;
}

@media (min-width: 760px) {
  section {
    padding: 88px 0;
  }
}

/* ------------------------------------------------------------ typography */

h1,
h2,
h3 {
  margin: 0;
  font-weight: 900;
}

.display {
  font-size: clamp(46px, 12.5vw, 96px);
  line-height: 0.92;
  letter-spacing: -0.042em;
  text-transform: uppercase;
}

.h2 {
  font-size: clamp(30px, 6vw, 46px);
  line-height: 0.96;
  letter-spacing: -0.03em;
  text-transform: uppercase;
}

.h3 {
  font-size: 22px;
  line-height: 1.05;
  letter-spacing: -0.4px;
  font-weight: 800;
  text-transform: uppercase;
}

p {
  margin: 0 0 14px;
}

.lead {
  font-size: 17px;
  line-height: 1.45;
  color: var(--text);
  max-width: 46ch;
}

.muted {
  color: var(--muted);
}

.small {
  font-size: 13px;
  line-height: 1.45;
  color: var(--muted);
}

/* The micro-caps register: every label the concept writes itself. */
.kicker {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 2.2px;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 14px;
}

.kicker::before {
  content: "";
  width: 12px;
  height: 2px;
  background: var(--accent);
  flex: none;
}

.kicker--plain::before {
  display: none;
}

/* The measuring strip: ticks along the width, every fourth a full cut mark. */
.cutstrip {
  height: 20px;
  background-image:
    repeating-linear-gradient(90deg, var(--accent) 0 3px, transparent 3px 36px),
    repeating-linear-gradient(90deg, var(--accent) 0 3px, transparent 3px 9px);
  background-size: 100% 100%, 100% 45%;
  background-position: bottom left, bottom left;
  background-repeat: repeat-x, repeat-x;
}

.cutstrip--idle {
  background-image:
    repeating-linear-gradient(90deg, var(--rule) 0 3px, transparent 3px 36px),
    repeating-linear-gradient(90deg, var(--rule) 0 3px, transparent 3px 9px);
}

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

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--page);
  border-bottom: 1px solid var(--rule);
}

.topbar .wrap {
  height: 54px;
  display: flex;
  align-items: center;
  gap: 16px;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 2.2px;
  text-transform: uppercase;
  color: var(--muted);
}

.brand strong {
  color: var(--text);
  font-weight: 800;
}

.langs {
  display: flex;
  align-items: center;
  gap: 2px;
  flex: none;
}

.langs a {
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 2.2px;
  text-transform: uppercase;
  color: var(--muted);
  background: var(--block);
  padding: 7px 10px;
}

.langs a:hover {
  background: var(--block-hot);
  color: var(--text);
}

.langs a[aria-current="true"] {
  background: var(--accent);
  color: var(--page);
}

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

.hero {
  padding: 40px 0 0;
}

.hero-grid {
  display: grid;
  gap: 36px;
  align-items: start;
}

@media (min-width: 900px) {
  .hero-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 48px;
    padding-bottom: 24px;
  }
}

.hero .display {
  margin-bottom: 22px;
}

.hero .cutstrip {
  margin-bottom: 26px;
}

/* -------------------------------------------------------------- controls */

.slab {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  background: var(--accent);
  color: var(--page);
  padding: 18px 16px 18px 20px;
  transform: translateY(0);
  transition: transform 120ms cubic-bezier(0.2, 0, 0, 1), background-color 120ms;
}

.slab:hover {
  color: var(--page);
  background: var(--accent-down);
}

.slab:active {
  transform: translateY(3px);
  background: var(--accent-down);
}

.slab .label {
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.2px;
  text-transform: uppercase;
  line-height: 1.05;
}

.slab .note {
  display: block;
  margin-top: 4px;
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 2.2px;
  text-transform: uppercase;
  color: rgba(7, 8, 11, 0.62);
}

.slab .slashes {
  margin-left: auto;
  flex: none;
}

.ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 50px;
  padding: 0 18px;
  border: 1px solid var(--rule);
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 1.8px;
  text-transform: uppercase;
}

.ghost:hover {
  background: var(--block-hot);
  border-color: var(--text);
  color: var(--text);
}

/* --------------------------------------------------------- store buttons */

.stores {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 26px 0 12px;
}

.store {
  display: flex;
  align-items: center;
  gap: 12px;
  /* The right padding keeps the «soon» badge off the words under it. */
  padding: 11px 58px 11px 14px;
  background: var(--block);
  border: 1px solid var(--rule);
  color: var(--text);
  min-width: 236px;
  position: relative;
}

.store:hover {
  background: var(--block-hot);
  border-color: var(--text);
  color: var(--text);
}

.store svg {
  flex: none;
}

.store .store-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.store .store-top {
  font-size: 9px;
  font-weight: 800;
  letter-spacing: 2.2px;
  text-transform: uppercase;
  color: var(--muted);
  white-space: nowrap;
}

.store .store-name {
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -0.2px;
  margin-top: 3px;
}

/* Not published yet: the badge says so on the button itself. */
.store .soon {
  position: absolute;
  top: -1px;
  right: -1px;
  background: var(--warn);
  color: var(--page);
  font-size: 9px;
  font-weight: 800;
  letter-spacing: 1.6px;
  text-transform: uppercase;
  padding: 3px 6px;
}

/* ---------------------------------------------------------------- blocks */

.grid {
  display: grid;
  gap: 2px;
}

@media (min-width: 720px) {
  .grid-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .grid-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .grid-4 {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.block {
  background: var(--block);
  padding: 22px 20px 24px;
}

.block .h3 {
  margin-bottom: 10px;
}

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

/* A block with the lit edge — the concept's alert/notice shape. */
.notice {
  display: flex;
  background: var(--block);
  border-left: 4px solid var(--accent);
}

.notice .body {
  padding: 16px 18px 18px;
}

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

.notice--warn {
  border-left-color: var(--warn);
}

/* ------------------------------------------------------------- the steps */

.steps {
  display: grid;
  gap: 2px;
}

@media (min-width: 860px) {
  .steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.step {
  background: var(--block);
  border-left: 3px solid var(--rule);
  padding: 20px 18px 22px;
}

.step .num {
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 1.8px;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.step .name {
  margin: 8px 0 10px;
  font-size: 22px;
  font-weight: 900;
  letter-spacing: -0.4px;
  text-transform: uppercase;
}

.step p {
  margin: 0;
  font-size: 14px;
  color: var(--muted);
  line-height: 1.4;
}

.step--lit {
  border-left-color: var(--accent);
}

.step--lit .name {
  color: var(--accent);
}

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

.shots {
  display: grid;
  gap: 24px 20px;
  grid-template-columns: minmax(0, 1fr);
}

@media (min-width: 620px) {
  .shots {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 980px) {
  .shots {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 30px 24px;
  }
}

.shot img {
  width: 100%;
  border: 1px solid var(--rule);
  background: var(--page);
}

.shot .cap {
  margin-top: 12px;
}

.shot .cap-title {
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 1.8px;
  text-transform: uppercase;
  color: var(--text);
  margin-bottom: 6px;
}

.shot .cap p {
  margin: 0;
  font-size: 13px;
  color: var(--muted);
  line-height: 1.4;
}

.hero-shot img {
  width: 100%;
  max-width: 412px;
  border: 1px solid var(--rule);
}

.filmstrip {
  margin-top: 28px;
  border: 1px solid var(--rule);
  overflow-x: auto;
}

.filmstrip img {
  min-width: 720px;
  width: 100%;
}

/* ------------------------------------------------------------ facts list */

.facts {
  display: grid;
  gap: 0;
}

.fact {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 16px 0;
  border-bottom: 1px solid var(--rule);
}

@media (min-width: 720px) {
  .fact {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }
}

.fact .fact-label {
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 2.2px;
  text-transform: uppercase;
  color: var(--muted);
}

.fact .fact-value {
  font-size: 15px;
  line-height: 1.4;
}

/* ------------------------------------------------------- document pages */

.doc {
  max-width: 760px;
}

.doc h2 {
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.4px;
  text-transform: uppercase;
  margin: 36px 0 12px;
}

.doc h2:first-of-type {
  margin-top: 28px;
}

.doc p,
.doc li {
  font-size: 15px;
  line-height: 1.5;
  color: var(--text);
}

.doc ul {
  margin: 0 0 14px;
  padding-left: 0;
  list-style: none;
}

.doc ul li {
  position: relative;
  padding-left: 18px;
  margin-bottom: 8px;
}

/* A cut mark instead of a bullet — nothing round. */
.doc ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 8px;
  height: 2px;
  background: var(--accent);
}

.doc .stamp {
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 2.2px;
  text-transform: uppercase;
  color: var(--muted);
  margin-top: 40px;
}

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

footer {
  border-top: 1px solid var(--rule);
  padding: 34px 0 48px;
}

.footer-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 20px 40px;
  justify-content: space-between;
  align-items: flex-start;
}

.footer-grid .kicker {
  margin-bottom: 8px;
}

.placeholder {
  color: var(--dead);
}

/* Skip-to-content, keyboard only. */
.skip {
  position: absolute;
  left: -9999px;
}

.skip:focus {
  left: 8px;
  top: 8px;
  background: var(--accent);
  color: var(--page);
  padding: 8px 12px;
  z-index: 20;
}