/*
 * Skimbold website. Built on the extension's design tokens (shared/theme.css): ledger paper,
 * library ink, one bottle-green accent. The demo sheet is the one loud element; everything
 * else stays quiet so the bold word starts carry the page.
 */

[hidden] {
  display: none !important;
}

html {
  scroll-padding-top: 88px;
}

body {
  font-size: var(--skb-text-lg);
  line-height: 1.6;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

h1,
h2,
h3 {
  margin: 0;
  font-family: var(--skb-font-read);
  line-height: 1.2;
  text-wrap: balance;
}

p {
  margin: 0;
  text-wrap: pretty;
}

code {
  padding: 1px 5px;
  border-radius: var(--skb-radius-xs);
  background: var(--skb-surface-sunk);
  font-family: ui-monospace, 'Cascadia Mono', Consolas, 'SF Mono', Menlo, monospace;
  font-size: 0.875em;
  overflow-wrap: anywhere;
}

.wrap {
  width: 100%;
  max-width: 1120px;
  margin-inline: auto;
  padding-inline: var(--skb-space-4);
}

@media (min-width: 720px) {
  .wrap {
    padding-inline: var(--skb-space-8);
  }
}

.skip-link {
  position: absolute;
  top: var(--skb-space-2);
  left: var(--skb-space-2);
  z-index: 10;
  padding: var(--skb-space-2) var(--skb-space-3);
  border-radius: var(--skb-radius-sm);
  background: var(--skb-surface);
  box-shadow: var(--skb-shadow-2);
  transform: translateY(-200%);
}

.skip-link:focus {
  transform: none;
}

/* ── Masthead ───────────────────────────────────────────────────────────── */

.masthead {
  position: sticky;
  top: 0;
  z-index: 5;
  border-bottom: 1px solid var(--skb-line);
  background: var(--skb-paper);
}

.masthead__inner {
  display: flex;
  align-items: center;
  gap: var(--skb-space-6);
  min-height: 64px;
}

.brand {
  display: inline-flex;
  flex: none;
  align-items: center;
  gap: 10px;
  color: var(--skb-ink);
  font-size: var(--skb-text-2xl);
  text-decoration: none;
}

.brand img {
  display: block;
}

.masthead__nav {
  display: none;
  gap: var(--skb-space-5);
  margin-right: auto;
  font-size: var(--skb-text-md);
}

.masthead__nav a,
.footer__nav a {
  color: var(--skb-ink-soft);
  text-decoration: none;
}

.masthead__nav a:hover,
.footer__nav a:hover {
  color: var(--skb-ink);
  text-decoration: underline;
}

.page-switch {
  flex: none;
  margin-left: auto;
  gap: var(--skb-space-2);
  font-size: var(--skb-text-sm);
  font-weight: 600;
  white-space: nowrap;
}

@media (min-width: 820px) {
  .masthead__nav {
    display: flex;
  }

  .page-switch {
    margin-left: 0;
  }
}

/* ── Hero ───────────────────────────────────────────────────────────────── */

.hero {
  padding-top: clamp(40px, 7vw, 88px);
  padding-bottom: var(--skb-space-10);
}

.hero__title {
  max-width: 11.5em;
  font-size: clamp(2.6rem, 1rem + 6.4vw, 6rem);
  font-weight: 400;
  line-height: 1.04;
  letter-spacing: -0.02em;
}

.hero__title b {
  font-weight: 800;
}

/* Before the script runs the headline is already bold, so nothing flashes without it.
   With it, the starts turn bold one word at a time, the way a page does on Alt+R. */
.js .hero__title b {
  font-weight: inherit;
}

.js .hero__title b.is-on {
  font-weight: 800;
}

.hero__lead {
  max-width: 34em;
  margin-top: var(--skb-space-6);
  font-family: var(--skb-font-read);
  font-size: clamp(var(--skb-text-xl), 1rem + 0.6vw, 22px);
  line-height: var(--skb-leading-read);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--skb-space-3);
  margin-top: var(--skb-space-8);
}

.hero__cta,
.install__stores .skb-btn {
  min-height: 44px;
  padding-inline: var(--skb-space-5);
  font-size: var(--skb-text-lg);
}

.hero__note {
  margin-top: var(--skb-space-4);
  font-size: var(--skb-text-md);
}

/* ── Demo sheet ─────────────────────────────────────────────────────────── */

.demo {
  padding-bottom: var(--skb-space-12);
}

.sheet {
  border: 1px solid var(--skb-line);
  border-radius: var(--skb-radius-lg);
  background: var(--skb-surface);
  box-shadow: var(--skb-shadow-2);
}

.sheet__head {
  display: grid;
  gap: var(--skb-space-4);
  padding: var(--skb-space-5) var(--skb-space-4);
  border-bottom: 1px solid var(--skb-line);
}

.sheet__title {
  font-size: var(--skb-text-2xl);
  font-weight: 700;
}

.demo__controls {
  display: grid;
  gap: var(--skb-space-4) var(--skb-space-6);
  grid-template-columns: minmax(0, 1fr);
}

@media (min-width: 640px) {
  .sheet__head {
    padding-inline: var(--skb-space-6);
  }

  .demo__controls {
    grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  }
}

.demo__control {
  align-content: start;
}

.sheet__body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
}

.demo__input,
.demo__output {
  display: flex;
  flex-direction: column;
  gap: var(--skb-space-2);
  min-width: 0;
  padding: var(--skb-space-5) var(--skb-space-4) var(--skb-space-6);
}

.demo__input {
  border-bottom: 1px solid var(--skb-line);
}

@media (min-width: 640px) {
  .demo__input,
  .demo__output {
    padding-inline: var(--skb-space-6);
  }
}

@media (min-width: 900px) {
  .sheet__body {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
  }

  .demo__input {
    border-right: 1px solid var(--skb-line);
    border-bottom: 0;
  }
}

.demo__label {
  color: var(--skb-ink-soft);
  font-size: var(--skb-text-sm);
  font-weight: 600;
}

.demo__textarea {
  flex: 1;
  min-height: 12em;
  font-family: var(--skb-font-read);
  font-size: var(--skb-text-lg);
  line-height: var(--skb-leading-read);
}

.demo__source {
  font-size: var(--skb-text-sm);
}

/* Ledger paper: a ruled line under every line of text and a margin rule on the left.
   Sizes are in em so the rules follow the text size. */
.ruled {
  --rule: 1.75em;
  padding: 0.1em 0 0 var(--skb-space-5);
  border-left: 3px double var(--skb-accent-tint);
  background-image: linear-gradient(to bottom, transparent calc(var(--rule) - 1px), var(--skb-line) calc(var(--rule) - 1px));
  background-size: 100% var(--rule);
  background-attachment: local;
  line-height: var(--rule);
}

.demo__preview {
  min-height: calc(7 * 1.75em);
  max-height: calc(16 * 1.75em);
  overflow-y: auto;
  color: color-mix(in srgb, var(--skb-ink) calc(100% - var(--fade, 0%)), transparent);
  font-family: var(--skb-font-read);
  font-size: clamp(var(--skb-text-lg), 0.9rem + 0.5vw, 19px);
  white-space: pre-wrap;
  overflow-wrap: break-word;
}

.demo__preview b {
  color: var(--skb-ink);
  font-weight: 800;
}

.demo__preview:focus-visible {
  outline-offset: 4px;
}

/* The whole-page preview from the masthead switch. Like the extension, the fade uses the
   text's own colour (links stay link-coloured), and the bold start keeps it at full strength. */
.skim {
  -webkit-text-fill-color: color-mix(in srgb, currentColor calc(100% - var(--fade, 0%)), transparent);
}

.skim b {
  font-weight: 800;
  -webkit-text-fill-color: currentColor;
}

/* ── Sections ───────────────────────────────────────────────────────────── */

.section {
  padding-block: var(--skb-space-12);
}

@media (min-width: 720px) {
  .section {
    padding-block: 72px;
  }
}

.section__title {
  font-size: clamp(28px, 1.2rem + 1.8vw, var(--skb-text-4xl));
  font-weight: 700;
  letter-spacing: -0.01em;
}

.section__lead {
  max-width: 40em;
  margin-top: var(--skb-space-3);
  color: var(--skb-ink-soft);
}

/* How it works: a real sequence, so the numbers carry meaning. */
.steps {
  display: grid;
  gap: var(--skb-space-8);
  margin: var(--skb-space-8) 0 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
}

@media (min-width: 860px) {
  .steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--skb-space-10);
  }
}

.steps__item {
  counter-increment: step;
  padding-top: var(--skb-space-4);
  border-top: 2px solid var(--skb-ink);
}

.steps__item::before {
  content: counter(step);
  display: block;
  margin-bottom: var(--skb-space-2);
  color: var(--skb-accent-ink);
  font: 800 var(--skb-text-4xl) / 1 var(--skb-font-read);
}

.steps__title {
  margin-bottom: var(--skb-space-2);
  font-size: var(--skb-text-2xl);
  font-weight: 700;
}

/* Features: plain text on the page rather than a grid of boxes. */
.features {
  display: grid;
  gap: var(--skb-space-8) var(--skb-space-10);
  margin: var(--skb-space-8) 0 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 640px) {
  .features {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

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

.feature__icon {
  display: block;
  width: 40px;
  height: 40px;
  margin-bottom: var(--skb-space-3);
  padding: 9px;
  border-radius: var(--skb-radius-md);
  background: var(--skb-surface-sunk);
  color: var(--skb-accent-ink);
}

.feature__title {
  margin-bottom: var(--skb-space-2);
  font-size: var(--skb-text-xl);
  font-weight: 700;
}

.feature p {
  color: var(--skb-ink-soft);
}

/* ── Install ────────────────────────────────────────────────────────────── */

/* Store buttons go in this row, one link each, next to the release download. */
.install__stores {
  display: flex;
  flex-wrap: wrap;
  gap: var(--skb-space-3);
  margin-top: var(--skb-space-6);
}

.install {
  display: grid;
  gap: var(--skb-space-10);
  margin-top: var(--skb-space-10);
}

@media (min-width: 900px) {
  .install {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: var(--skb-space-12);
  }
}

.install__block > * + * {
  margin-top: var(--skb-space-3);
}

.install__block > .install__title + * {
  margin-top: var(--skb-space-3);
}

.install__block > * + .install__title {
  margin-top: var(--skb-space-8);
}

.install__title {
  font-size: var(--skb-text-2xl);
  font-weight: 700;
}

.install__steps {
  display: grid;
  gap: var(--skb-space-3);
  margin-bottom: 0;
  padding: 0;
  list-style: none;
  counter-reset: install;
}

.install__steps li {
  position: relative;
  padding-left: 40px;
  counter-increment: install;
}

.install__steps li::before {
  content: counter(install);
  position: absolute;
  top: 0;
  left: 0;
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border: 1px solid var(--skb-line-strong);
  border-radius: 50%;
  background: var(--skb-surface);
  font: 700 var(--skb-text-sm) / 1 var(--skb-font-ui);
}

.install__note {
  font-size: var(--skb-text-md);
}

/* ── Reader band ────────────────────────────────────────────────────────── */

.reader-band {
  border-block: 1px solid var(--skb-line);
  background: var(--skb-surface-sunk);
}

.reader-band__inner {
  display: grid;
  gap: var(--skb-space-5);
  align-items: center;
  padding-block: var(--skb-space-10);
}

@media (min-width: 820px) {
  .reader-band__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: var(--skb-space-10);
  }
}

.reader-band__title {
  margin-bottom: var(--skb-space-2);
  font-size: clamp(var(--skb-text-2xl), 1rem + 1vw, 28px);
  font-weight: 700;
}

.reader-band p {
  max-width: 44em;
  color: var(--skb-ink-soft);
}

.reader-band__cta {
  justify-self: start;
  min-height: 44px;
  padding-inline: var(--skb-space-5);
  font-size: var(--skb-text-lg);
}

/* ── Open source ────────────────────────────────────────────────────────── */

.oss {
  display: grid;
  gap: var(--skb-space-3);
  max-width: 44em;
  margin-top: var(--skb-space-4);
}

/* ── Footer ─────────────────────────────────────────────────────────────── */

.footer {
  border-top: 1px solid var(--skb-line);
}

.footer__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--skb-space-4) var(--skb-space-8);
  padding-block: var(--skb-space-8) var(--skb-space-12);
}

.footer__mark {
  font-size: var(--skb-text-2xl);
}

.footer__nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--skb-space-2) var(--skb-space-5);
  font-size: var(--skb-text-md);
}

/* ── Prose pages (privacy, 404) ─────────────────────────────────────────── */

.prose {
  max-width: 44em;
  padding-block: var(--skb-space-10) var(--skb-space-12);
}

.prose h1 {
  font-size: clamp(32px, 1.4rem + 2.4vw, var(--skb-text-5xl));
  font-weight: 700;
  letter-spacing: -0.015em;
}

.prose h2 {
  margin-top: var(--skb-space-10);
  font-size: var(--skb-text-2xl);
  font-weight: 700;
}

.prose p,
.prose ul {
  margin-top: var(--skb-space-3);
}

.prose ul {
  padding-left: 1.25em;
}

.prose li + li {
  margin-top: var(--skb-space-2);
}

.prose h1.title-skim {
  font-weight: 400;
}

.title-skim b {
  font-weight: 800;
}

.prose__meta {
  margin-top: var(--skb-space-3);
  color: var(--skb-ink-soft);
}

.prose__summary {
  margin-top: var(--skb-space-6);
  padding: var(--skb-space-4) var(--skb-space-5);
  border-left: 3px solid var(--skb-accent);
  border-radius: var(--skb-radius-xs);
  background: var(--skb-surface-sunk);
  font-family: var(--skb-font-read);
  font-size: var(--skb-text-xl);
  line-height: var(--skb-leading-read);
}

.prose__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--skb-space-3);
  margin-top: var(--skb-space-8);
}