/* The landing page.
 *
 * The page is paper and ink, because the app is paper and ink. It has one
 * primary action, one typeface, one curve per motion, and it shows the product
 * at full size rather than cropping it into fragments.
 *
 * Every length below resolves through a token in tokens.css. Nothing here
 * writes a colour, a size or a curve by hand, so the whole page moves as one
 * when a token moves.
 */

/* ------------------------------------------------------------- the typeface */

@import url("./tokens.css");
@import url("./base.css");

/* Plus Jakarta Sans, the face the app embeds, so the page and the window in
 * its screenshots are set in the same type. Four weights, subset to Latin, and
 * 15 KB each rather than the 126 KB the full file weighs. */
@font-face {
  font-family: "Plus Jakarta Sans";
  src: url("assets/fonts/PlusJakartaSans-Regular.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "Plus Jakarta Sans";
  src: url("assets/fonts/PlusJakartaSans-Medium.woff2") format("woff2");
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "Plus Jakarta Sans";
  src: url("assets/fonts/PlusJakartaSans-SemiBold.woff2") format("woff2");
  font-weight: 600;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "Plus Jakarta Sans";
  src: url("assets/fonts/PlusJakartaSans-Bold.woff2") format("woff2");
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

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

/* A floating pill, detached from the top edge, so the page reads as one sheet
 * of paper with a control resting on it rather than as a website with a bar. */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  padding-top: var(--s-6);
  pointer-events: none;
}

.nav__pill {
  pointer-events: auto;
  display: flex;
  align-items: center;
  gap: var(--s-6);
  width: max-content;
  max-width: calc(100% - var(--gutter) * 2);
  margin-inline: auto;
  padding: var(--s-2) var(--s-2) var(--s-2) var(--s-6);
  border-radius: var(--r-pill);
  background: color-mix(in oklab, var(--card) 78%, transparent);
  border: 1px solid var(--rule);
  backdrop-filter: blur(20px) saturate(1.4);
  -webkit-backdrop-filter: blur(20px) saturate(1.4);
  transition: box-shadow var(--dur-long) var(--ease-out),
    border-color var(--dur-long) var(--ease-out);
}

.nav[data-stuck="true"] .nav__pill {
  box-shadow: var(--shadow-card);
  border-color: var(--rule-strong);
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  font-weight: 600;
  font-size: var(--t-body);
  letter-spacing: var(--track-title);
}

/* The mark: five bars, the one that plays is tallest. It is the app's icon
 * idea drawn small, so the brand is the product and not a separate logo. */
.wordmark__mark {
  display: inline-flex;
  align-items: flex-end;
  gap: 2px;
  height: 15px;
}

.wordmark__mark i {
  display: block;
  width: 2.5px;
  border-radius: 1px;
  background: var(--ink);
}

.wordmark__mark i:nth-child(1) { height: 6px; }
.wordmark__mark i:nth-child(2) { height: 11px; }
.wordmark__mark i:nth-child(3) { height: 15px; }
.wordmark__mark i:nth-child(4) { height: 9px; }
.wordmark__mark i:nth-child(5) { height: 5px; }

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--s-1);
}

.nav__links a {
  display: inline-flex;
  align-items: center;
  min-height: var(--control-h);
  padding: 0 var(--s-3);
  border-radius: var(--r-pill);
  font-size: var(--t-body);
  font-weight: 500;
  color: var(--muted);
  transition: color var(--dur-short) ease, background-color var(--dur-short) ease;
}

@media (hover: hover) and (pointer: fine) {
  .nav__links a:hover {
    color: var(--ink);
    background: var(--sunken);
  }
}

.nav__tools {
  display: flex;
  align-items: center;
  gap: var(--s-2);
}

/* The theme switch. Three states in the app; two on the page, because a page
 * cannot follow a desktop it cannot ask about more than once. */
.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: var(--control-h);
  height: var(--control-h);
  border-radius: var(--r-pill);
  color: var(--muted);
  transition: color var(--dur-short) ease, background-color var(--dur-short) ease,
    transform var(--dur-press) var(--ease-press);
}

@media (hover: hover) and (pointer: fine) {
  .theme-toggle:hover {
    color: var(--ink);
    background: var(--sunken);
  }
}

.theme-toggle:active {
  transform: scale(0.94);
}

.theme-toggle svg {
  width: 18px;
  height: 18px;
}

.theme-toggle .icon-moon { display: none; }
:root[data-theme="dark"] .theme-toggle .icon-sun { display: none; }
:root[data-theme="dark"] .theme-toggle .icon-moon { display: block; }

/* The hamburger, which becomes an X. The lines rotate into place; they never
 * disappear and reappear, because a menu that teleports feels broken. */
.nav__burger {
  display: none;
  position: relative;
  width: var(--control-h);
  height: var(--control-h);
  border-radius: var(--r-pill);
  color: var(--ink);
}

.nav__burger i {
  position: absolute;
  left: 12px;
  width: 16px;
  height: 1.5px;
  border-radius: 1px;
  background: currentColor;
  transition: transform var(--dur-long) var(--ease-in-out),
    opacity var(--dur-short) var(--ease-out);
}

.nav__burger i:nth-child(1) { top: 16px; }
.nav__burger i:nth-child(2) { top: 20px; }
.nav__burger i:nth-child(3) { top: 24px; }

.nav[data-open="true"] .nav__burger i:nth-child(1) { transform: translateY(4px) rotate(45deg); }
.nav[data-open="true"] .nav__burger i:nth-child(2) { opacity: 0; }
.nav[data-open="true"] .nav__burger i:nth-child(3) { transform: translateY(-4px) rotate(-45deg); }

/* The overlay the burger opens. */
.menu {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: grid;
  align-content: center;
  gap: var(--s-2);
  padding: var(--s-24) var(--gutter);
  background: color-mix(in oklab, var(--page) 86%, transparent);
  backdrop-filter: blur(28px) saturate(1.2);
  -webkit-backdrop-filter: blur(28px) saturate(1.2);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--dur-long) var(--ease-out),
    visibility 0s linear var(--dur-long);
}

.menu[data-open="true"] {
  opacity: 1;
  visibility: visible;
  transition: opacity var(--dur-long) var(--ease-out), visibility 0s;
}

.menu a {
  font-size: var(--t-title);
  font-weight: 600;
  letter-spacing: var(--track-title);
  padding-block: var(--s-3);
  border-bottom: 1px solid var(--rule);
  transform: translateY(16px);
  opacity: 0;
  transition: transform var(--dur-long) var(--ease-out),
    opacity var(--dur-long) var(--ease-out);
}

.menu[data-open="true"] a {
  transform: none;
  opacity: 1;
}

.menu[data-open="true"] a:nth-child(1) { transition-delay: 80ms; }
.menu[data-open="true"] a:nth-child(2) { transition-delay: 130ms; }
.menu[data-open="true"] a:nth-child(3) { transition-delay: 180ms; }
.menu[data-open="true"] a:nth-child(4) { transition-delay: 230ms; }

@media (max-width: 52rem) {
  .nav__links { display: none; }
  .nav__burger { display: inline-flex; }
  .nav__pill { gap: var(--s-2); padding-left: var(--s-4); }
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--s-2);
  min-height: var(--control-h);
  padding: var(--s-2) var(--s-3);
  border-radius: var(--r-control);
  font-size: var(--t-body);
  font-weight: 600;
  white-space: nowrap;
  transition: background-color var(--dur-short) ease,
    border-color var(--dur-short) ease, color var(--dur-short) ease,
    transform var(--dur-press) var(--ease-press);
}

.btn:active {
  transform: scale(0.98);
}

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

@media (hover: hover) and (pointer: fine) {
  .btn--primary:hover {
    background: color-mix(in oklab, var(--action) 86%, var(--page));
  }
}

.btn--quiet {
  background: var(--card);
  color: var(--ink);
  border: 1px solid var(--rule);
}

@media (hover: hover) and (pointer: fine) {
  .btn--quiet:hover {
    border-color: var(--rule-strong);
    background: var(--rail);
  }
}

.btn--small {
  min-height: 36px;
  padding: var(--s-1) var(--s-3);
  font-size: var(--t-body);
}

/* -------------------------------------------------------------- the shell */

.section {
  padding-block: clamp(var(--s-16), 9vw, var(--s-24));
}

.section--tight {
  padding-block: clamp(var(--s-12), 6vw, var(--s-16));
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  font-size: var(--t-caption);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.eyebrow::before {
  content: "";
  width: 18px;
  height: 1px;
  background: var(--rule-strong);
}

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

.hero {
  padding-top: clamp(var(--s-16), 10vw, var(--s-24));
  padding-bottom: clamp(var(--s-12), 6vw, var(--s-16));
}

.hero__text {
  display: grid;
  gap: var(--s-8);
  max-width: 680px;
}

/* The one gradient on the page, on the heading only. It is derived from the
 * ink and the page, so it is correct in both schemes without a second rule. */
.hero h1 {
  font-size: var(--t-display);
  font-weight: 600;
  letter-spacing: var(--track-display);
  line-height: var(--lead-display);
  background: linear-gradient(
    90deg,
    var(--ink) 8%,
    color-mix(in oklab, var(--ink) 52%, var(--page)) 100%
  );
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero__lead {
  max-width: 54ch;
}

.hero__action {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--s-4);
}

.hero__facts {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--s-2) var(--s-4);
  padding-top: var(--s-2);
  font-size: var(--t-caption);
  color: var(--muted);
}

.hero__facts span {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
}

.hero__facts span + span::before {
  content: "";
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--rule-strong);
  margin-right: var(--s-2);
}

/* The window: a card with the screenshot inside it, at full size.
 * The outer radius is 24 and the gap is 8, so the inner radius is 16. */
.window {
  margin-top: clamp(var(--s-10), 5vw, var(--s-16));
  padding: var(--s-2);
  border-radius: var(--r-card);
  background: var(--card);
  border: 1px solid var(--rule);
  box-shadow: var(--shadow-window);
}

.window img {
  width: 100%;
  border-radius: var(--r-stock);
  border: 1px solid var(--rule);
}

.window figcaption {
  display: flex;
  justify-content: space-between;
  gap: var(--s-4);
  padding: var(--s-3) var(--s-2) var(--s-1);
  font-size: var(--t-caption);
  color: var(--muted);
}

/* ------------------------------------------------------- the tagline reveal */

/* The page's one big statement. It is set in the display size, split into
 * words, and each word lights as it crosses the trigger line. */
.tagline {
  padding-block: clamp(var(--s-16), 10vw, var(--s-24));
  border-block: 1px solid var(--rule);
  background: var(--rail);
}

.tagline p {
  max-width: 22ch;
  font-size: var(--t-display);
  font-weight: 600;
  letter-spacing: var(--track-display);
  line-height: var(--lead-display);
}

.tagline .word {
  opacity: 0.26;
  transition: opacity var(--dur-long) var(--ease-out);
}

.tagline .word[data-lit="true"] {
  opacity: 1;
}

/* The marked phrase keeps its ink block, and the words inside it still light
 * one at a time, so the emphasis arrives with the sentence rather than before
 * it. */
.tagline .mark {
  background: var(--accent);
  color: var(--accent-ink);
  border-radius: 10px;
  padding: 0 0.1em;
  box-decoration-break: clone;
  -webkit-box-decoration-break: clone;
}

/* --------------------------------------------------------------- benefits */

.benefits {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--s-4);
  margin-top: var(--s-12);
}

.benefit {
  display: grid;
  align-content: start;
  gap: var(--s-3);
  padding: var(--s-8);
  border-radius: var(--r-card);
  background: var(--card);
  border: 1px solid var(--rule);
}

.benefit__icon {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--sunken);
  color: var(--ink);
  margin-bottom: var(--s-1);
}

.benefit__icon svg {
  width: 18px;
  height: 18px;
}

.benefit h3 {
  font-size: var(--t-body);
  font-weight: 600;
  letter-spacing: 0;
  line-height: var(--lead-title);
}

.benefit p {
  font-size: var(--t-body);
  color: var(--muted);
}

/* ------------------------------------------------------------- how it works */

.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--s-8);
  margin-top: var(--s-12);
  counter-reset: step;
}

.step {
  display: grid;
  align-content: start;
  gap: var(--s-3);
  padding-top: var(--s-4);
  border-top: 1px solid var(--rule-strong);
  counter-increment: step;
}

.step::before {
  content: counter(step, decimal-leading-zero);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: var(--accent);
  color: var(--accent-ink);
  font-size: var(--t-caption);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.step h3 {
  font-size: var(--t-lead);
  font-weight: 600;
  letter-spacing: var(--track-title);
  line-height: var(--lead-title);
}

.step p {
  font-size: var(--t-body);
  color: var(--muted);
}

/* --------------------------------------------------------------- the tour */

.tour {
  display: grid;
  gap: clamp(var(--s-16), 8vw, var(--s-24));
  margin-top: var(--s-12);
}

.tour__item {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: clamp(var(--s-6), 5vw, var(--s-16));
  align-items: center;
}

.tour__item:nth-child(even) .tour__text {
  order: 2;
}

.tour__text {
  display: grid;
  align-content: center;
  gap: var(--s-3);
}

.tour__text h3 {
  font-size: var(--t-headline);
  font-weight: 600;
  letter-spacing: var(--track-headline);
  line-height: var(--lead-headline);
  max-width: 20ch;
}

.tour__text p {
  font-size: var(--t-body);
  color: var(--muted);
  max-width: 44ch;
}

/* The same window card, smaller, so four screens fit without a crop. */
.tour .window {
  margin-top: 0;
  padding: var(--s-1);
}

.tour .window img {
  border-radius: 20px;
}

@media (max-width: 60rem) {
  .tour__item,
  .tour__item:nth-child(even) {
    grid-template-columns: minmax(0, 1fr);
  }

  .tour__item:nth-child(even) .tour__text {
    order: 0;
  }

  .tour .window {
    padding: var(--s-2);
  }

  .tour .window img {
    border-radius: var(--r-stock);
  }
}

/* -------------------------------------------------------------- the accents */

/* The one interactive demonstration: five tones, and the page wears the one
 * you pick. It is a real setting of the app, not a decoration. */
.accents {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(var(--s-6), 5vw, var(--s-16));
  align-items: center;
  padding: clamp(var(--s-6), 4vw, var(--s-10));
  border-radius: var(--r-card);
  background: var(--card);
  border: 1px solid var(--rule);
}

.accents__text {
  display: grid;
  gap: var(--s-3);
}

.accents__text h3 {
  font-size: var(--t-title);
  font-weight: 600;
  letter-spacing: var(--track-title);
  line-height: var(--lead-title);
}

.accents__text p {
  font-size: var(--t-body);
  color: var(--muted);
}

.swatches {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-3);
}

.swatch {
  position: relative;
  width: 44px;
  height: 44px;
  border-radius: var(--r-pill);
  background: var(--swatch);
  box-shadow: inset 0 0 0 1px rgb(0 0 0 / 0.12);
  transition: transform var(--dur-short) var(--ease-out),
    box-shadow var(--dur-short) var(--ease-out);
}

@media (hover: hover) and (pointer: fine) {
  .swatch:hover {
    transform: scale(1.08);
  }
}

.swatch[aria-pressed="true"] {
  box-shadow: inset 0 0 0 1px rgb(0 0 0 / 0.12), 0 0 0 3px var(--card), 0 0 0 5px var(--ink);
}

.swatch:active {
  transform: scale(0.96);
}

.swatch__name {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

@media (max-width: 60rem) {
  .accents {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* ------------------------------------------------------------------- proof */

/* What is true about the build, in numbers a reader can check. */
.proof {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: var(--s-6);
  margin-top: var(--s-8);
  padding-top: var(--s-6);
  border-top: 1px solid var(--rule);
}

.proof div {
  display: grid;
  gap: var(--s-1);
}

.proof dt {
  font-size: var(--t-caption);
  font-weight: 500;
  color: var(--muted);
}

.proof dd {
  margin: 0;
  font-size: var(--t-lead);
  font-weight: 600;
  letter-spacing: var(--track-title);
  font-variant-numeric: tabular-nums;
}

/* --------------------------------------------------------------------- faq */

.faq {
  max-width: 760px;
  margin-top: var(--s-10);
  border-top: 1px solid var(--rule);
}

.faq details {
  border-bottom: 1px solid var(--rule);
}

.faq summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-4);
  padding-block: var(--s-4);
  font-size: var(--t-lead);
  font-weight: 500;
  letter-spacing: var(--track-title);
  cursor: pointer;
  list-style: none;
}

.faq summary::-webkit-details-marker {
  display: none;
}

.faq summary svg {
  flex: none;
  width: 16px;
  height: 16px;
  color: var(--muted);
  transition: transform var(--dur-short) var(--ease-out),
    color var(--dur-short) ease;
}

.faq details[open] summary svg {
  transform: rotate(45deg);
  color: var(--ink);
}

@media (hover: hover) and (pointer: fine) {
  .faq summary:hover svg {
    color: var(--ink);
  }
}

.faq details p {
  padding-bottom: var(--s-4);
  max-width: 62ch;
  font-size: var(--t-body);
  color: var(--muted);
}

.faq details p + p {
  padding-top: 0;
}

/* --------------------------------------------------------------- the close */

/* The one inverted band. It names its own roles, so the light theme inverts
 * the paper and the dark theme raises a card: a black band on a black page is
 * not a band, and a button that swaps --page and --ink is a button that turns
 * invisible the moment the scheme changes. */
.close {
  padding-block: clamp(var(--s-16), 9vw, var(--s-24));
  background: var(--band);
  color: var(--band-ink);
}

:root[data-theme="dark"] .close {
  border-block: 1px solid var(--rule);
}

.close__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(var(--s-8), 6vw, var(--s-16));
  align-items: center;
}

.close h2 {
  font-size: var(--t-headline);
  font-weight: 600;
  letter-spacing: var(--track-headline);
  line-height: var(--lead-headline);
  max-width: 16ch;
}

.close p {
  color: var(--band-muted);
  max-width: 44ch;
}

.close .btn--primary {
  background: var(--band-ink);
  color: var(--band);
}

@media (hover: hover) and (pointer: fine) {
  .close .btn--primary:hover {
    background: color-mix(in oklab, var(--band-ink) 84%, var(--band));
  }
}

.close__text {
  display: grid;
  gap: var(--s-6);
  justify-items: start;
}

.close .window {
  background: color-mix(in oklab, var(--band-ink) 8%, var(--band));
  border-color: var(--band-rule);
  box-shadow: none;
}

.close .window img {
  border-color: var(--band-rule);
}

:root[data-theme="dark"] .close .window {
  background: var(--rail);
  border-color: var(--rule);
}

@media (max-width: 60rem) {
  .close__grid {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* ---------------------------------------------------------------- the foot */

.foot {
  padding-block: var(--s-12);
}

.foot__grid {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-4) var(--s-8);
}

.foot__mark {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  font-weight: 600;
  font-size: var(--t-body);
}

.foot__links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-2) var(--s-6);
  font-size: var(--t-body);
  color: var(--muted);
}

.foot__links a {
  transition: color var(--dur-short) ease;
}

@media (hover: hover) and (pointer: fine) {
  .foot__links a:hover {
    color: var(--ink);
  }
}

.foot__line {
  flex-basis: 100%;
  padding-top: var(--s-4);
  border-top: 1px solid var(--rule);
  font-size: var(--t-caption);
  color: var(--muted);
  max-width: 78ch;
}

/* ----------------------------------------------------------------- reveals */

/* Entering the viewport: a short lift, a short fade, and a blur that clears.
 * 800ms with a strong ease out, once, and only on the way in. */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity var(--dur-reveal) var(--ease-out),
    transform var(--dur-reveal) var(--ease-out);
}

.reveal[data-blur="true"] {
  filter: blur(6px);
  transition: opacity var(--dur-reveal) var(--ease-out),
    transform var(--dur-reveal) var(--ease-out),
    filter var(--dur-reveal) var(--ease-out);
}

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

.reveal[data-delay="1"] { transition-delay: 60ms; }
.reveal[data-delay="2"] { transition-delay: 120ms; }
.reveal[data-delay="3"] { transition-delay: 180ms; }
.reveal[data-delay="4"] { transition-delay: 240ms; }
.reveal[data-delay="5"] { transition-delay: 300ms; }

/* Reduced motion: the page arrives, it just does not travel. Colour and
 * opacity stay, so a state change is still legible. */
@media (prefers-reduced-motion: reduce) {
  .reveal,
  .reveal[data-blur="true"] {
    opacity: 1;
    transform: none;
    filter: none;
    transition: none;
  }

  .tagline .word {
    opacity: 1;
    transition: none;
  }

  .menu a,
  .menu[data-open="true"] a {
    transform: none;
    opacity: 1;
    transition: none;
  }

  .btn:active,
  .swatch:active,
  .theme-toggle:active {
    transform: none;
  }
}