/* Nian Shou Digital shared foundation */

:root {
  color-scheme: light;
  --color-background: #f7f8fa;
  --color-surface: #ffffff;
  --color-text: #18191d;
  --color-text-muted: #5c606a;
  --color-border: #d9dde4;
  --color-accent: #3454d1;
  --color-accent-hover: #2944ae;
  --color-accent-soft: #e9edfc;
  --color-focus: #1739bd;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-display: ui-rounded, "SF Pro Rounded", var(--font-sans);
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 5rem;
  --radius-small: 0.5rem;
  --radius-card: 1rem;
  --shadow-card: 0 1rem 2.5rem rgb(24 25 29 / 8%);
  --content-width: 70rem;
}

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

html {
  scroll-behavior: smooth;
}

body {
  min-width: 20rem;
  min-height: 100vh;
  margin: 0;
  background: var(--color-background);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

button,
input,
textarea,
select {
  font: inherit;
}

h1,
h2,
h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.025em;
}

h1 {
  font-size: clamp(2.5rem, 7vw, 4.75rem);
}

h2 {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
}

h3 {
  font-size: 1.25rem;
}

p {
  margin-block: 0;
}

a {
  color: var(--color-accent);
  text-underline-offset: 0.2em;
}

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

:focus-visible {
  outline: 0.1875rem solid var(--color-focus);
  outline-offset: 0.1875rem;
}

.container {
  width: min(100% - 2rem, var(--content-width));
  margin-inline: auto;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  top: var(--space-3);
  left: var(--space-3);
  z-index: 100;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-small);
  background: var(--color-text);
  color: var(--color-surface);
  transform: translateY(-200%);
}

.skip-link:focus {
  color: var(--color-surface);
  transform: translateY(0);
}

/* Shared header and navigation */
.site-header {
  position: relative;
  z-index: 10;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
}

.header-layout {
  position: relative;
  display: flex;
  min-height: 4.5rem;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
}

.site-name {
  color: var(--color-text);
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 700;
  text-decoration: none;
}

.site-name:hover {
  color: var(--color-accent);
}

.site-navigation {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.site-navigation a,
.footer-navigation a {
  min-height: 2.75rem;
  display: inline-flex;
  align-items: center;
  color: var(--color-text-muted);
  font-weight: 600;
  text-decoration: none;
}

.site-navigation a:hover,
.site-navigation a[aria-current="page"],
.footer-navigation a:hover,
.footer-navigation a[aria-current="page"] {
  color: var(--color-text);
}

.site-navigation a[aria-current="page"] {
  box-shadow: inset 0 -0.1875rem var(--color-accent);
}

.nav-toggle {
  display: none;
  min-width: 2.75rem;
  min-height: 2.75rem;
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-small);
  background: var(--color-surface);
  color: var(--color-text);
  cursor: pointer;
}

/* Shared page and placeholder layout */
.page-shell {
  min-height: 60vh;
  padding-block: var(--space-8);
}

.placeholder-section {
  min-height: 20rem;
  display: grid;
  align-items: center;
  padding-block: var(--space-8);
  border-bottom: 1px solid var(--color-border);
}

.placeholder-section--hero {
  min-height: 32rem;
  background: var(--color-surface);
}

/* Shared buttons */
.button {
  min-height: 2.75rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  border: 1px solid transparent;
  border-radius: var(--radius-small);
  font-weight: 700;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
}

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

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

.button--secondary {
  border-color: var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
}

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

/* Shared cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 17rem), 1fr));
  gap: var(--space-5);
}

.card {
  padding: var(--space-6);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  background: var(--color-surface);
  box-shadow: var(--shadow-card);
}

/* Home page */
.home-hero {
  display: grid;
  min-height: 26rem;
  align-items: center;
  padding-block: calc(var(--space-7) + var(--space-2));
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
}

.home-hero__content {
  display: grid;
  gap: var(--space-5);
}

.home-hero h1 {
  max-width: 13ch;
}

.home-hero p {
  max-width: 42rem;
  color: var(--color-text-muted);
  font-size: clamp(1.125rem, 2.4vw, 1.375rem);
}

.button-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: 0;
}

.home-section {
  padding-block: calc(var(--space-7) + var(--space-2));
  border-bottom: 1px solid var(--color-border);
}

.home-section--surface {
  background: var(--color-surface);
}

.section-title {
  margin-bottom: var(--space-7);
}

.home-section .section-title {
  margin-bottom: var(--space-6);
}

.featured-app {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(15rem, 22rem);
  gap: var(--space-7);
  align-items: center;
}

.featured-app__content {
  display: grid;
  justify-items: start;
  gap: var(--space-5);
}

.product-heading,
.product-card {
  display: flex;
  align-items: flex-start;
  gap: var(--space-5);
}

.product-heading h3 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
}

.product-summary,
.product-card p {
  margin-top: var(--space-2);
  color: var(--color-text-muted);
}

.app-icon {
  width: 4.5rem;
  flex: 0 0 4.5rem;
  border-radius: 1rem;
}

.app-icon--large {
  width: 6rem;
  flex-basis: 6rem;
  border-radius: 1.375rem;
}

.benefit-list {
  display: grid;
  gap: var(--space-3);
  margin: 0;
  padding-left: 1.25rem;
  color: var(--color-text-muted);
}

.featured-app__visual {
  padding: var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  background: var(--color-surface);
  box-shadow: var(--shadow-card);
}

.app-screenshot {
  width: 100%;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
}

.product-card {
  color: var(--color-text);
  text-decoration: none;
}

.product-card:hover {
  color: var(--color-text);
  border-color: var(--color-accent);
}

.in-development-grid {
  grid-template-columns: minmax(0, 1fr);
  max-width: 42rem;
}

.product-card--informational:hover {
  border-color: var(--color-border);
}

.placeholder-app-icon {
  display: grid;
  place-items: center;
  background: var(--color-background);
  color: var(--color-text-muted);
  font-size: 2rem;
  font-weight: 700;
}

.status-badge {
  display: inline-flex;
  margin-bottom: var(--space-2);
  padding: var(--space-1) var(--space-2);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  color: var(--color-text-muted);
  font-size: 0.875rem;
  font-weight: 700;
}

.product-card__action {
  margin-top: var(--space-4);
}

.product-card__action:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

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

.philosophy-content .section-title {
  margin-bottom: 0;
}

.philosophy-copy {
  display: grid;
  gap: var(--space-3);
  color: var(--color-text-muted);
  font-size: 1.125rem;
}

/* Product pages */
.product-hero {
  padding-block: var(--space-8);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
}

.product-hero__layout {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: var(--space-7);
}

.product-hero__icon {
  width: clamp(7rem, 16vw, 11rem);
  border-radius: clamp(1.5rem, 3vw, 2.5rem);
}

.product-hero p {
  max-width: 38rem;
  margin-block: var(--space-4) var(--space-6);
  color: var(--color-text-muted);
  font-size: clamp(1.125rem, 2.4vw, 1.375rem);
}

.product-section {
  padding-block: var(--space-8);
  border-bottom: 1px solid var(--color-border);
}

.product-section--surface {
  background: var(--color-surface);
}

.product-copy-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: var(--space-7);
}

.product-benefit-list {
  font-size: 1.125rem;
}

.screenshot-grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: var(--space-5);
  align-items: start;
}

.screenshot-grid img {
  grid-column: span 2;
  width: 100%;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  cursor: zoom-in;
}

.screenshot-grid > img:only-child {
  grid-column: 3 / span 2;
}

.screenshot-grid:has(> img:nth-child(2):last-child) > img,
.screenshot-grid:has(> img:nth-child(4):last-child) > img {
  grid-column: span 3;
}

.screenshot-grid:has(> img:nth-child(5):last-child) > img:nth-child(4) {
  grid-column: 2 / span 2;
}

/* Shared screenshot lightbox */
.lightbox[hidden] {
  display: none;
}

.lightbox {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: grid;
  place-items: center;
  padding: var(--space-6);
  background: rgb(24 25 29 / 92%);
}

.lightbox__stage {
  width: 100%;
  height: 100%;
  display: grid;
  grid-template-columns: 3rem minmax(0, 1fr) 3rem;
  align-items: center;
  gap: var(--space-4);
}

.lightbox__image {
  max-width: 100%;
  max-height: calc(100vh - 4rem);
  justify-self: center;
  object-fit: contain;
}

.lightbox__close,
.lightbox__control {
  min-width: 2.75rem;
  min-height: 2.75rem;
  display: inline-grid;
  place-items: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-small);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: 2rem;
  line-height: 1;
  cursor: pointer;
}

.lightbox__close {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  z-index: 1;
}

.lightbox__control:disabled {
  cursor: default;
  opacity: 0.45;
}

.product-actions__layout,
.product-actions nav {
  display: flex;
  align-items: center;
}

.product-actions__layout {
  justify-content: space-between;
  gap: var(--space-5);
}

.product-actions nav {
  gap: var(--space-5);
}

.product-actions nav a {
  color: var(--color-text-muted);
  font-weight: 600;
}

.product-actions nav a:hover {
  color: var(--color-text);
}

/* Informational pages */
.content-hero {
  padding-block: calc(var(--space-7) + var(--space-2));
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
}

.content-section {
  min-height: 24rem;
  padding-block: var(--space-7);
}

.prose {
  display: grid;
  max-width: 42rem;
  gap: var(--space-4);
  color: var(--color-text-muted);
  font-size: 1.125rem;
}

.resource-list {
  display: grid;
  max-width: 42rem;
}

.resource-card {
  color: var(--color-text);
  font-weight: 600;
  text-decoration: none;
}

.resource-card:hover {
  color: var(--color-text);
  border-color: var(--color-accent);
}

.resource-card p {
  margin-top: var(--space-2);
  color: var(--color-text-muted);
  font-weight: 400;
}

/* Shared footer */
.site-footer {
  padding-block: var(--space-6);
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text-muted);
}

.home-page .site-footer {
  padding-block: var(--space-5);
}

.footer-layout,
.footer-navigation {
  display: flex;
  align-items: center;
}

.footer-layout {
  justify-content: space-between;
  gap: var(--space-5);
}

.footer-navigation {
  gap: var(--space-5);
}

.site-footer p {
  font-size: 0.875rem;
}

@media (max-width: 40rem) {
  .js .nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .js .site-navigation {
    position: absolute;
    top: calc(100% + 1px);
    right: 0;
    left: 0;
    display: none;
    padding: var(--space-3) 1rem var(--space-4);
    border-bottom: 1px solid var(--color-border);
    background: var(--color-surface);
  }

  .js .site-navigation[data-open] {
    display: grid;
  }

  .site-navigation a {
    padding-inline: var(--space-2);
  }

  .site-navigation a[aria-current="page"] {
    box-shadow: inset 0.1875rem 0 var(--color-accent);
  }

  .footer-layout {
    align-items: flex-start;
    flex-direction: column;
  }

  .placeholder-section {
    min-height: 15rem;
    padding-block: var(--space-7);
  }

  .placeholder-section--hero {
    min-height: 24rem;
  }

  .page-shell {
    padding-block: var(--space-7);
  }

  .home-hero {
    min-height: 26rem;
    padding-block: calc(var(--space-6) + var(--space-2));
  }

  .home-section {
    padding-block: calc(var(--space-6) + var(--space-2));
  }

  .section-title {
    margin-bottom: var(--space-6);
  }

  .button-group,
  .button-group .button {
    width: 100%;
  }

  .featured-app {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }

  .featured-app__visual {
    max-width: 22rem;
    padding: var(--space-4);
  }

  .product-heading,
  .product-card {
    gap: var(--space-4);
  }

  .app-icon--large {
    width: 5rem;
    flex-basis: 5rem;
    border-radius: 1.125rem;
  }

  .philosophy-content {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }

  .product-hero,
  .product-section {
    padding-block: var(--space-7);
  }

  .product-hero__layout,
  .product-copy-layout {
    grid-template-columns: 1fr;
  }

  .product-hero__layout {
    gap: var(--space-6);
  }

  .product-hero__icon {
    width: 7rem;
  }

  .screenshot-grid {
    display: flex;
    gap: var(--space-4);
    overflow-x: auto;
    padding: var(--space-1) var(--space-1) var(--space-4);
    scroll-snap-type: x mandatory;
  }

  .screenshot-grid img {
    width: min(78vw, 18rem);
    flex: 0 0 auto;
    scroll-snap-align: start;
  }

  .screenshot-grid--landscape img {
    width: min(88vw, 32rem);
  }

  .lightbox {
    padding: var(--space-4);
  }

  .lightbox__stage {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    grid-template-rows: minmax(0, 1fr) auto;
    gap: var(--space-4);
  }

  .lightbox__image {
    grid-column: 1 / -1;
    grid-row: 1;
    max-height: calc(100vh - 7rem);
  }

  .lightbox__control {
    grid-row: 2;
    width: 100%;
  }

  .lightbox__previous {
    grid-column: 1;
  }

  .lightbox__next {
    grid-column: 2;
  }

  .product-actions__layout {
    align-items: flex-start;
    flex-direction: column;
  }

  .content-hero,
  .content-section {
    padding-block: calc(var(--space-6) + var(--space-2));
  }
}

@media (min-width: 40.0625rem) and (max-width: 64rem) {
  .featured-app {
    grid-template-columns: minmax(0, 1fr) minmax(14rem, 18rem);
    gap: var(--space-7);
  }

  .screenshot-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .screenshot-grid > img,
  .screenshot-grid > img:only-child,
  .screenshot-grid:has(> img:nth-child(2):last-child) > img,
  .screenshot-grid:has(> img:nth-child(4):last-child) > img,
  .screenshot-grid:has(> img:nth-child(5):last-child) > img:nth-child(4) {
    grid-column: auto;
  }
}

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

@media (forced-colors: active) {
  .site-navigation a[aria-current="page"] {
    border-bottom: 0.1875rem solid CanvasText;
    box-shadow: none;
  }
}