/* Hallmark · genre: modern-minimal · macrostructure: Split Studio
 * theme: existing Yurucommu brand · nav: N9 edge-aligned · footer: Ft2 inline
 * audience: prospective self-hosted SNS users · action: try or install
 * enrichment: real product screenshots · motion: hover and focus only
 */

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

html {
  overflow-x: clip;
  scroll-behavior: smooth;
  scroll-padding-top: 6rem;
}

body {
  margin: 0;
  overflow-x: clip;
  background: var(--color-night);
  color: var(--color-white);
  font-family: var(--font-body);
  font-size: var(--text-body);
  line-height: 1.9;
  -webkit-font-smoothing: antialiased;
}

/* Fixed dark surfaces keep their own browser UI and focus colors. */
.nav,
.hero,
.principles,
.server-section,
.advertisement,
.footer,
.code {
  color-scheme: only dark;
  --color-focus: var(--color-night-focus);
}

h1,
h2,
h3,
p,
figure {
  margin: 0;
}

h1,
h2,
h3 {
  min-width: 0;
  overflow-wrap: anywhere;
  font-family: var(--font-display);
  font-style: normal;
  line-height: 1.5;
  letter-spacing: -0.035em;
}

a {
  color: inherit;
  text-decoration: none;
}

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

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

a:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 5px;
}

.wrap {
  width: min(100% - 6rem, 1200px);
  margin-inline: auto;
}

.skip {
  position: absolute;
  top: var(--space-sm);
  left: var(--space-sm);
  z-index: 100;
  padding: var(--space-xs) var(--space-sm);
  transform: translateY(-200%);
  background: var(--color-accent);
  color: var(--color-white);
}

.skip:focus {
  transform: none;
}

.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--color-night);
  border-bottom: 1px solid var(--color-night-rule);
}

.nav-inner,
.nav-links,
.brand,
.hero-actions,
.footer-links {
  display: flex;
  align-items: center;
}

.nav-inner {
  min-height: 80px;
  justify-content: space-between;
  gap: var(--space-sm);
}

.brand {
  gap: 0.625rem;
  font-weight: 700;
  font-size: 1rem;
  white-space: nowrap;
}

.brand img {
  flex: none;
  border-radius: 22%;
}

.nav-links {
  gap: var(--space-lg);
  font-size: 0.875rem;
}

.nav-secondary {
  color: var(--color-night-muted);
  white-space: nowrap;
}

.nav-secondary:hover,
.footer-links a:hover {
  color: var(--color-white);
  text-decoration: underline;
  text-underline-offset: 0.35em;
}

.button,
.text-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  max-width: 100%;
  white-space: nowrap;
  font-size: 0.9375rem;
  font-weight: 700;
}

.button {
  min-height: 48px;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-action);
  background: var(--color-accent);
  color: var(--color-white);
  transition: background var(--dur-short) var(--ease-out);
}

.button:hover {
  background: var(--color-accent-hover);
}

.button:active {
  transform: translateY(1px);
}

.button-small {
  min-height: 42px;
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

.text-link {
  min-height: 44px;
  justify-content: flex-start;
  text-decoration: underline;
  text-decoration-color: var(--color-rule);
  text-underline-offset: 0.4em;
  transition: text-decoration-color var(--dur-short) var(--ease-out);
}

.text-link:hover {
  text-decoration-color: currentColor;
}

.hero {
  padding-block: var(--space-3xl) var(--space-2xl);
}

.hero-grid,
.feature-row,
.section-intro,
.server-inner,
.start-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  align-items: center;
  gap: var(--space-2xl);
}

.hero-copy,
.feature-copy,
.server-copy,
.start-install,
.start-local {
  min-width: 0;
}

.hero-brand {
  font-size: clamp(1.8rem, 4.3vw, 3.5rem);
  font-weight: 900;
  line-height: 1.2;
}

.hero-title {
  margin-top: var(--space-lg);
  font-size: clamp(1.5rem, 2.1vw, 1.85rem);
  font-weight: 700;
  line-height: 1.7;
  letter-spacing: -0.035em;
}

.hero-description {
  margin-top: var(--space-md);
  max-width: 30rem;
  color: var(--color-night-muted);
  line-height: 2;
}

.hero-actions {
  margin-top: var(--space-lg);
  flex-wrap: wrap;
  gap: var(--space-sm) var(--space-md);
}

.hero-note {
  margin-top: var(--space-md);
  color: var(--color-night-muted);
  font-size: var(--text-small);
}

.hero-figure {
  min-width: 0;
}

.hero-screen {
  display: block;
  overflow: hidden;
  aspect-ratio: 578 / 660;
  background: var(--color-night-panel);
  border: 1px solid var(--color-night-rule);
  border-radius: var(--radius-screen);
}

/* Focus the desktop capture on its feed; the mobile source uses its full UI. */
.hero-screen img {
  width: 221.453%;
  max-width: none;
  transform: translateX(-26.5625%);
}

figcaption {
  margin-top: var(--space-sm);
  color: var(--color-muted);
  font-size: var(--text-small);
  text-align: center;
}

.hero-figure figcaption {
  color: var(--color-night-muted);
}

.principles {
  padding-block: var(--space-lg);
  border-top: 1px solid var(--color-night-rule);
}

.principles-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-xs) var(--space-lg);
  font-size: 0.9375rem;
  color: var(--color-night-muted);
}

.features,
.community-section,
.start-section {
  background: var(--color-paper);
  color: var(--color-ink);
}

.features,
.story-section,
.community-section,
.server-section,
.start-section {
  padding-block: var(--space-3xl);
}

.section-intro h2,
.feature-copy h2,
.feature-copy h3,
.server-inner h2 {
  font-size: var(--text-heading);
  font-weight: 700;
}

.section-intro p,
.feature-copy p,
.start-grid p {
  color: var(--color-muted);
  max-width: 28rem;
}

.timeline-row {
  margin-top: var(--space-3xl);
}

.feature-copy p {
  margin-top: var(--space-md);
}

.feature-copy .text-link {
  margin-top: var(--space-md);
}

.timeline-screen {
  display: block;
  overflow: hidden;
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-screen);
  background: var(--color-night-panel);
}

.story-section {
  background: var(--color-paper-blue);
  color: var(--color-ink);
}

.story-row {
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
}

.story-row .feature-copy {
  grid-column: 2;
  grid-row: 1;
}

.story-figure {
  grid-column: 1;
  grid-row: 1;
}

/* The real viewer occupies x27..532/y430..1329 in a 560x1760 capture.
 * Center that 506x900 region; retain all viewer controls without padding. */
.story-screen {
  position: relative;
  width: min(100%, 290px);
  aspect-ratio: 506 / 900;
  margin-inline: auto;
  overflow: hidden;
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-screen);
  background: var(--color-night);
}

.story-screen img {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 110.672%;
  max-width: none;
  transform: translate(-50%, -50%);
}

/* Show the community menu at a readable scale, instead of shrinking
 * the full desktop screenshot and its surrounding sidebars. */
.community-screen {
  position: relative;
  max-width: 500px;
  aspect-ratio: 1.12;
  margin-inline: auto;
  overflow: hidden;
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-screen);
  background: var(--color-night);
}

.community-screen img {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 230%;
  max-width: none;
  transform: translate(-50%, -50%);
}

.server-inner {
  align-items: start;
}

.server-copy p {
  color: var(--color-night-muted);
}

.server-copy p + p {
  margin-top: var(--space-md);
}

.server-copy .text-link {
  margin-top: var(--space-md);
}

.start-grid {
  margin-top: var(--space-2xl);
  align-items: start;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.start-grid h3 {
  font-size: 1.25rem;
  font-weight: 700;
}

.start-grid p {
  margin-top: var(--space-sm);
}

.start-grid .button,
.start-grid .text-link {
  margin-top: var(--space-md);
}

.self-host {
  margin-top: var(--space-xl);
}

.code {
  margin: var(--space-md) 0 0;
  padding: var(--space-md);
  overflow-x: auto;
  background: var(--color-night);
  color: var(--color-white);
  border-radius: var(--radius-action);
  font-family: var(--font-mono);
  font-size: var(--text-small);
  line-height: 2;
  white-space: pre;
}

.code code {
  font-family: inherit;
}

.start-grid .local-note {
  font-size: var(--text-small);
}

.advertisement {
  width: min(100%, 488px);
  margin-inline: auto;
}

.advertisement:has(> :not(script)) {
  padding: var(--space-md);
}

.footer {
  padding-block: var(--space-xl);
  border-top: 1px solid var(--color-night-rule);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-md) var(--space-xl);
}

.footer-links {
  flex-wrap: wrap;
  gap: var(--space-sm) var(--space-md);
  font-size: 0.875rem;
  color: var(--color-night-muted);
}

.footer-links a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  white-space: nowrap;
}

.footer-copy {
  color: var(--color-night-muted);
  font-size: var(--text-small);
}

@media (max-width: 1100px) {
  .wrap {
    width: calc(100% - 4rem);
  }

  .hero-grid,
  .feature-row,
  .section-intro,
  .server-inner,
  .start-grid {
    gap: var(--space-xl);
  }
}

@media (max-width: 767px) {
  .wrap {
    width: calc(100% - 3rem);
  }

  .nav-inner {
    min-height: 72px;
  }

  .nav-secondary {
    display: none;
  }

  .hero {
    padding-block: var(--space-xl);
  }

  .hero-grid,
  .feature-row,
  .section-intro,
  .server-inner,
  .start-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-lg);
  }

  .hero-brand {
    font-size: clamp(1.8rem, 8vw, 2.8rem);
  }

  .hero-title {
    font-size: clamp(1.375rem, 5vw, 1.7rem);
  }

  .hero-description {
    max-width: 36rem;
  }

  .hero-figure {
    margin-top: var(--space-sm);
  }

  .hero-screen,
  .timeline-screen {
    width: min(100%, 320px);
    aspect-ratio: 390 / 844;
    margin-inline: auto;
  }

  .hero-screen img {
    width: 100%;
    transform: none;
  }

  /* The hero already shows the complete mobile UI. Here, focus on its
   * posts without repeating the navigation and story bar. */
  .timeline-screen {
    aspect-ratio: 390 / 470;
  }

  .timeline-screen img {
    transform: translateY(-24%);
  }

  .principles {
    padding-block: var(--space-md);
  }

  .principles-inner {
    display: grid;
    gap: 0.25rem;
    font-size: 0.875rem;
  }

  .features,
  .story-section,
  .community-section,
  .server-section,
  .start-section {
    padding-block: var(--space-xl);
  }

  .timeline-row {
    margin-top: var(--space-xl);
  }

  .story-row .feature-copy,
  .story-figure {
    grid-column: auto;
    grid-row: auto;
  }

  .story-screen {
    width: min(100%, 280px);
  }

  .community-screen {
    width: min(100%, 420px);
  }

  .start-grid {
    margin-top: var(--space-xl);
    gap: var(--space-xl);
  }

  .desktop-break {
    display: none;
  }

  .footer-links {
    gap: var(--space-xs) var(--space-md);
  }
}

@media (max-width: 374px) {
  .wrap {
    width: calc(100% - 2.5rem);
  }

  .nav-inner {
    gap: var(--space-xs);
  }

  .brand {
    font-size: 0.9375rem;
    gap: var(--space-xs);
  }

  .button-small {
    padding-inline: 0.75rem;
  }

  .hero-actions {
    align-items: flex-start;
    flex-direction: column;
  }

  .button,
  .text-link {
    font-size: 0.875rem;
    gap: var(--space-xs);
  }
}

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

  .button,
  .text-link {
    transition: none;
  }

  .button:active {
    transform: none;
  }
}