/* Falling Sand — approved Set A paper/ink/blue direction.
   Colors: the app's own design tokens and screenshot styling sources.
   Local Fredoka/Nunito fonts are unmodified app assets; OFL notices accompany them.
   All page styles use the shared style.css token mechanism and remain app-scoped. */
@font-face {
  font-family: 'Falling Sand Display';
  src: url('/app/falling-sand/images/fonts/Fredoka-SemiBold.ttf') format('truetype');
  font-style: normal;
  font-weight: 600;
  font-display: swap;
}

@font-face {
  font-family: 'Falling Sand Text';
  src: url('/app/falling-sand/images/fonts/Nunito-Medium.ttf') format('truetype');
  font-style: normal;
  font-weight: 500;
  font-display: swap;
}

@font-face {
  font-family: 'Falling Sand Text';
  src: url('/app/falling-sand/images/fonts/Nunito-Bold.ttf') format('truetype');
  font-style: normal;
  font-weight: 700;
  font-display: swap;
}

body.falling-sand-page {
  --paper: #F7F3EC;
  --ink: #394454;
  --ink-2: #5A6471;
  --ink-3: #5A6471;
  --line: #E4DDD1;
  --line-strong: #D4CABC;
  --accent: #174EA6;
  --accent-dark: #123E85;
  --font-display: 'Falling Sand Display', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', system-ui, sans-serif;
  --font-body: 'Falling Sand Text', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', system-ui, sans-serif;
  --font-mono: var(--font-body);
  --fs-surface: #FBF8F2;
  --fs-surface-2: #EEE9DF;
  --fs-blue: #2478F2;
  min-height: 100vh;
  overflow-x: visible;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-weight: 500;
  line-height: 1.65;
}

body.falling-sand-page h1,
body.falling-sand-page h2,
body.falling-sand-page h3 {
  font-weight: 600;
  letter-spacing: -0.025em;
}

body.falling-sand-page img {
  max-width: 100%;
}

body.falling-sand-page .navbar.scrolled {
  background: var(--paper);
  border-bottom-color: var(--line);
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
}

body.falling-sand-page .nav-container {
  max-width: 1120px;
}

body.falling-sand-page .nav-logo,
body.falling-sand-page .lang-toggle {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

body.falling-sand-page .lang-toggle {
  font-size: 0.9rem;
  letter-spacing: 0;
}

body.falling-sand-page .fs-container {
  width: min(1120px, calc(100% - 48px));
  margin-inline: auto;
}

body.falling-sand-page section[id] {
  scroll-margin-top: 88px;
}

body.falling-sand-page .fs-hero {
  padding-block: 120px 72px;
}

body.falling-sand-page .fs-hero-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 350px);
  align-items: center;
  gap: clamp(32px, 6vw, 88px);
}

body.falling-sand-page .fs-product {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 28px;
}

body.falling-sand-page .fs-app-icon {
  display: block;
  width: 64px;
  height: 64px;
  flex-shrink: 0;
  border-radius: 16px;
}

body.falling-sand-page .fs-product-name {
  font: 600 1.4rem/1.3 var(--font-display);
}

body.falling-sand-page .fs-product-kind {
  margin-top: 3px;
  color: var(--ink-2);
  font-size: 0.95rem;
}

body.falling-sand-page .fs-title {
  max-width: 14ch;
  font-size: clamp(3.25rem, 6vw, 5.25rem);
  line-height: 1.03;
}

body.falling-sand-page .fs-color-text {
  display: block;
  color: var(--fs-blue);
}

body.falling-sand-page .fs-lede {
  max-width: 48ch;
  margin-top: 26px;
  font-size: clamp(1.1rem, 1.5vw, 1.25rem);
  line-height: 1.65;
}

body.falling-sand-page .fs-release-note {
  max-width: 53ch;
  margin-top: 24px;
  padding-inline-start: 16px;
  border-inline-start: 3px solid var(--line-strong);
  color: var(--ink-2);
  font-size: 0.95rem;
}

body.falling-sand-page .fs-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 24px;
  margin-top: 30px;
}

body.falling-sand-page .fs-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  min-height: 48px;
  padding: 12px 22px;
  border: 1px solid var(--accent);
  border-radius: 12px;
  background: var(--accent);
  color: #FFFFFF;
  font-weight: 700;
  line-height: 1.4;
  text-align: center;
}

body.falling-sand-page .fs-text-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  color: var(--accent);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 4px;
}

body.falling-sand-page .fs-capture {
  width: min(100%, 320px);
  margin-inline: auto;
}

body.falling-sand-page .fs-capture img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line-strong);
  border-radius: 24px;
  box-shadow: 0 12px 36px #39445414;
}

body.falling-sand-page .fs-capture figcaption {
  margin-top: 14px;
  color: var(--ink-2);
  font-size: 0.85rem;
  line-height: 1.5;
  text-align: center;
  text-wrap: balance;
}

body.falling-sand-page .fs-rules {
  padding-block: 80px 88px;
  border-top: 1px solid var(--line);
}

body.falling-sand-page .fs-rule-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  gap: clamp(32px, 6vw, 88px);
}

body.falling-sand-page .fs-section-title {
  max-width: 17ch;
  font-size: clamp(2.15rem, 3.8vw, 3.4rem);
  line-height: 1.12;
  text-wrap: balance;
}

body.falling-sand-page .fs-section-intro {
  max-width: 42ch;
  margin-top: 22px;
  color: var(--ink-2);
  font-size: 1.08rem;
}

body.falling-sand-page .fs-steps {
  list-style: none;
}

body.falling-sand-page .fs-steps li {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 20px;
  padding-block: 22px;
  border-top: 1px solid var(--line-strong);
}

body.falling-sand-page .fs-step-number {
  color: var(--accent);
  font-size: 1.1rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

body.falling-sand-page .fs-steps h3 {
  font-size: 1.45rem;
  line-height: 1.3;
}

body.falling-sand-page .fs-steps p {
  margin-top: 8px;
  color: var(--ink-2);
}

body.falling-sand-page .fs-progress {
  padding-block: 80px;
  background: var(--fs-surface-2);
  border-block: 1px solid var(--line);
}

body.falling-sand-page .fs-progress-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 350px);
  align-items: center;
  gap: clamp(32px, 6vw, 88px);
}

body.falling-sand-page .fs-threshold {
  margin-top: 24px;
  color: var(--accent);
  font-size: 1.35rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

body.falling-sand-page .fs-progress-copy > p:not(.fs-threshold) {
  max-width: 49ch;
  margin-top: 12px;
  font-size: 1.08rem;
}

body.falling-sand-page .fs-benefits {
  max-width: 52ch;
  margin-top: 36px;
}

body.falling-sand-page .fs-benefits > div {
  padding-block: 22px;
  border-top: 1px solid var(--line-strong);
}

body.falling-sand-page .fs-benefits dt {
  font-size: 1.15rem;
  font-weight: 700;
}

body.falling-sand-page .fs-benefits dd {
  margin-top: 8px;
  color: var(--ink-2);
}

body.falling-sand-page .fs-support {
  padding-block: 80px;
}

body.falling-sand-page .fs-support-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(32px, 6vw, 88px);
}

body.falling-sand-page .fs-email {
  display: inline-block;
  max-width: 100%;
  margin-top: 22px;
  padding-block: 8px;
  color: var(--accent);
  font-size: 1.1rem;
  font-weight: 700;
  overflow-wrap: anywhere;
  text-decoration: underline;
  text-underline-offset: 4px;
}

body.falling-sand-page .fs-link-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 20px;
  align-items: center;
  gap: 24px;
  padding-block: 24px;
  border-top: 1px solid var(--line-strong);
}

body.falling-sand-page .fs-link-row:last-child {
  border-bottom: 1px solid var(--line-strong);
}

body.falling-sand-page .fs-link-row strong {
  color: var(--accent);
  font-size: 1.2rem;
  text-decoration: underline;
  text-underline-offset: 4px;
}

body.falling-sand-page .fs-link-row p {
  margin-top: 8px;
  color: var(--ink-2);
}

body.falling-sand-page .fs-link-arrow {
  color: var(--accent);
  font-size: 1.5rem;
}

body.falling-sand-page .footer {
  background: var(--fs-surface);
}

body.falling-sand-page .footer-container {
  max-width: 1168px;
}

body.falling-sand-page .footer-top {
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr) minmax(0, 1fr);
  gap: 48px;
}

body.falling-sand-page .footer-column-title {
  font-weight: 700;
  letter-spacing: 0;
  text-transform: none;
  font-size: 0.95rem;
}

body.falling-sand-page .footer-links-col a {
  display: inline-block;
  min-height: 32px;
  padding-block: 4px;
}

body.falling-sand-page .footer-bottom a {
  overflow-wrap: anywhere;
}

/* Shared product/legal interface: body.falling-sand-page.fs-legal-page,
   .fs-container, .fs-legal-content and optional .fs-legal-nav. */
body.falling-sand-page.fs-legal-page main {
  padding-block: 120px 80px;
}

body.falling-sand-page .fs-legal-content {
  max-width: 760px;
  margin-inline: auto;
  overflow-wrap: break-word;
}

body.falling-sand-page .fs-legal-content h1 {
  font-size: clamp(2.2rem, 5vw, 3.2rem);
  line-height: 1.15;
  margin-block: 20px;
  text-wrap: balance;
}

body.falling-sand-page .fs-legal-content h2 {
  margin-block: 38px 14px;
  font-size: 1.65rem;
  line-height: 1.3;
}

body.falling-sand-page .fs-legal-content h3 {
  margin-block: 26px 10px;
  font-size: 1.2rem;
  line-height: 1.4;
}

body.falling-sand-page .fs-legal-content p,
body.falling-sand-page .fs-legal-content ul,
body.falling-sand-page .fs-legal-content ol {
  margin-bottom: 16px;
  color: var(--ink-2);
  line-height: 1.8;
}

body.falling-sand-page .fs-legal-content ul,
body.falling-sand-page .fs-legal-content ol {
  padding-inline-start: 24px;
}

body.falling-sand-page .fs-legal-content ul {
  list-style: disc;
}

body.falling-sand-page .fs-legal-content ol {
  list-style: decimal;
}

body.falling-sand-page .fs-legal-content li + li {
  margin-top: 8px;
}

body.falling-sand-page .fs-legal-content a,
body.falling-sand-page .fs-legal-nav a {
  color: var(--accent);
  font-weight: 700;
  overflow-wrap: anywhere;
  text-decoration: underline;
  text-underline-offset: 3px;
}

body.falling-sand-page .fs-legal-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  margin-bottom: 24px;
}

body.falling-sand-page .fs-legal-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
}

body.falling-sand-page .fs-legal-content .last-updated {
  font-size: 0.9rem;
}

body.falling-sand-page:lang(zh-Hans) .fs-title,
body.falling-sand-page:lang(zh-Hans) .fs-section-title {
  line-height: 1.25;
  letter-spacing: 0;
}

@media (hover: hover) and (pointer: fine) {
  body.falling-sand-page .fs-button:hover {
    background: var(--accent-dark);
    border-color: var(--accent-dark);
  }

  body.falling-sand-page .fs-text-link:hover,
  body.falling-sand-page .fs-email:hover,
  body.falling-sand-page .fs-link-row:hover strong {
    color: var(--accent-dark);
  }
}

@media (max-width: 860px) {
  body.falling-sand-page .fs-hero-layout,
  body.falling-sand-page .fs-rule-layout,
  body.falling-sand-page .fs-progress-layout,
  body.falling-sand-page .fs-support-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 40px;
  }

  body.falling-sand-page .fs-hero-copy,
  body.falling-sand-page .fs-progress-copy {
    max-width: 650px;
  }

  body.falling-sand-page .fs-hero {
    padding-block: 108px 56px;
  }

  body.falling-sand-page .fs-capture {
    width: min(100%, 280px);
  }

  body.falling-sand-page .fs-section-title {
    max-width: 22ch;
  }

  body.falling-sand-page .fs-section-intro {
    max-width: 54ch;
  }
}

@media (max-width: 768px) {
  body.falling-sand-page .footer-top {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
  }
}

@media (max-width: 540px) {
  body.falling-sand-page .fs-container {
    width: calc(100% - 40px);
  }

  body.falling-sand-page .navbar {
    padding-inline: 20px;
  }

  body.falling-sand-page .fs-product {
    gap: 12px;
    margin-bottom: 24px;
  }

  body.falling-sand-page .fs-app-icon {
    width: 56px;
    height: 56px;
    border-radius: 14px;
  }

  body.falling-sand-page .fs-title {
    font-size: clamp(2.65rem, 12vw, 4rem);
  }

  body.falling-sand-page .fs-rules,
  body.falling-sand-page .fs-progress,
  body.falling-sand-page .fs-support {
    padding-block: 56px;
  }

  body.falling-sand-page .fs-steps li {
    grid-template-columns: 28px minmax(0, 1fr);
    gap: 14px;
  }

  body.falling-sand-page .fs-steps h3 {
    font-size: 1.3rem;
  }

  body.falling-sand-page .fs-actions {
    gap: 10px 20px;
  }

  body.falling-sand-page .footer-container {
    padding-inline: 20px;
  }
}

@media (forced-colors: active) {
  body.falling-sand-page .fs-button {
    border-color: ButtonText;
  }

  body.falling-sand-page .fs-capture img {
    border-color: CanvasText;
  }
}