/*
 * site.css
 *
 * Stylesheet for the Polya Technologies institutional website.
 * Companion file to '../../README.md' and to 'marketing/.claude/rules/design.md'
 * and 'marketing/.claude/rules/websites.md'.
 *
 * Tokens are consumed from the canonical files copied alongside this stylesheet.
 * The local copies must be kept byte-identical to the canonical sources; see the
 * SYNC INVENTORY in the site README.md.
 *
 * No hardcoded color, typography, spacing or radius value appears in this file;
 * every such value resolves to a canonical token via 'var(--token-name)'. A few
 * local CSS custom properties expressing derivations (e.g., a 20-percent-reduced
 * variant of an existing token) are declared in the local :root block.
 */


/* === Token imports === */

@import url("./tokens.css");
@import url("./dark-theme-tokens.css");
@import url("./wordmark-tokens.css");


/* === Font face declarations (self-hosted, Latin subset) === */

/*
 * unicode-range covers Basic Latin (U+0000-007F) and Latin-1 Supplement
 * (U+0080-00FF), plus typographic punctuation needed by the content:
 * en/em dashes (U+2013-2014), curly quotes (U+2018-201F), bullet (U+2022),
 * euro (U+20AC), trademark (U+2122) and the Unicode minus (U+2212) required
 * by design.md for signed numerical figures.
 */

@font-face {
  font-family: "IBM Plex Serif";
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url("../fonts/IBMPlexSerif-Medium.woff2") format("woff2");
  unicode-range:
    U+0000-00FF, U+2013-2014, U+2018-201F, U+2022, U+20AC, U+2122, U+2212;
}

@font-face {
  font-family: "IBM Plex Sans";
  font-style: normal;
  font-weight: 200;
  font-display: swap;
  src: url("../fonts/IBMPlexSans-ExtraLight.woff2") format("woff2");
  unicode-range:
    U+0000-00FF, U+2013-2014, U+2018-201F, U+2022, U+20AC, U+2122, U+2212;
}

@font-face {
  font-family: "IBM Plex Sans";
  font-style: normal;
  font-weight: 300;
  font-display: swap;
  src: url("../fonts/IBMPlexSans-Light.woff2") format("woff2");
  unicode-range:
    U+0000-00FF, U+2013-2014, U+2018-201F, U+2022, U+20AC, U+2122, U+2212;
}

@font-face {
  font-family: "IBM Plex Sans";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("../fonts/IBMPlexSans-Regular.woff2") format("woff2");
  unicode-range:
    U+0000-00FF, U+2013-2014, U+2018-201F, U+2022, U+20AC, U+2122, U+2212;
}

@font-face {
  font-family: "IBM Plex Sans";
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url("../fonts/IBMPlexSans-Medium.woff2") format("woff2");
  unicode-range:
    U+0000-00FF, U+2013-2014, U+2018-201F, U+2022, U+20AC, U+2122, U+2212;
}

@font-face {
  font-family: "IBM Plex Mono";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("../fonts/IBMPlexMono-Regular.woff2") format("woff2");
  unicode-range:
    U+0000-00FF, U+2013-2014, U+2018-201F, U+2022, U+20AC, U+2122, U+2212;
}

@font-face {
  font-family: "IBM Plex Mono";
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url("../fonts/IBMPlexMono-Medium.woff2") format("woff2");
  unicode-range:
    U+0000-00FF, U+2013-2014, U+2018-201F, U+2022, U+20AC, U+2122, U+2212;
}


/* === Local layout constants === */
/*
 * These are layout-specific values that do not belong to the design system as
 * cross-touchpoint tokens; they parametrize this particular website only.
 *
 * --accent-muted-soft is derived from --accent-muted (rgba(255,255,255,0.08)
 * in the dark theme) reduced to 80 percent of its alpha, used as a more subtle
 * highlight for the active nav link.
 *
 * --hover-overlay is the slightly stronger overlay used on button hover, set
 * to twice the alpha of --accent-muted.
 */

:root {
  --site-max-width: 72rem;
  --site-gutter: var(--space-5);
  --nav-height: 4.5rem;
  --hairline: 0.5px;
  --accent-muted-soft: rgba(255, 255, 255, 0.064);
  --hover-overlay: rgba(255, 255, 255, 0.16);
}


/* === Reset and base === */

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

html {
  color-scheme: dark;
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
  background: var(--bg-base);
}

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100svh;
  background: var(--bg-base);
  color: var(--fg-primary);
  font-family: var(--font-sans);
  font-weight: 400;
  font-size: 1.125rem;
  line-height: 1.5;
  letter-spacing: 0;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-feature-settings: "kern" 1;
}

::selection {
  background: var(--selection-bg);
  color: var(--fg-primary);
}

a {
  color: var(--link);
  text-decoration-thickness: var(--hairline);
  text-underline-offset: 0.25em;
}

a:hover,
a:focus-visible {
  color: var(--link-hover);
}

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

button {
  font: inherit;
  color: inherit;
  background: transparent;
  border: 0;
  cursor: pointer;
}

p,
h1,
h2,
h3,
ul,
ol {
  margin: 0;
}

ul,
ol {
  padding: 0;
  list-style: none;
}

:focus-visible {
  outline: var(--hairline) solid var(--fg-primary);
  outline-offset: 2px;
}


/* === Utility classes === */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  top: var(--space-3);
  left: var(--space-3);
  z-index: 100;
  padding: var(--space-3) var(--space-4);
  background: var(--bg-raised);
  color: var(--fg-primary);
  border: var(--hairline) solid var(--border-strong);
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  text-decoration: none;
  transform: translateY(-200%);
  transition: transform 160ms ease;
}

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


/* === Site navigation === */

.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  background: var(--bg-base);
  border-bottom: var(--hairline) solid var(--border-subtle);
}

.site-nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
  height: var(--nav-height);
  width: 100%;
  max-width: var(--site-max-width);
  margin-inline: auto;
  padding-inline: var(--site-gutter);
}

.brand {
  display: inline-flex;
  align-items: center;
  height: 2.1rem;
}

.brand-mark {
  height: 100%;
  width: auto;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.nav-link {
  display: inline-flex;
  align-items: center;
  padding: var(--space-2) var(--space-3);
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.875rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fg-muted);
  text-decoration: none;
  border: var(--hairline) solid transparent;
  border-radius: var(--radius-md);
  transition:
    color 160ms ease,
    border-color 160ms ease,
    background-color 160ms ease;
}

.nav-link:hover,
.nav-link:focus-visible,
.nav-link.is-active {
  color: var(--fg-primary);
  border-color: var(--border-strong);
  background: var(--accent-muted-soft);
}

.menu-toggle {
  display: none;
  padding: var(--space-2) var(--space-3);
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.875rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fg-primary);
  border: var(--hairline) solid var(--border-strong);
  border-radius: var(--radius-md);
}


/* === Main content offset === */

main {
  padding-top: var(--nav-height);
}


/* === Eyebrow (shared label) === */

.eyebrow {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.875rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fg-muted);
  margin: 0 0 var(--space-5);
}


/* === Hero === */

.hero {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-block: clamp(var(--space-7), 15vh, var(--space-10));
}

.hero-inner {
  width: 100%;
  max-width: var(--site-max-width);
  margin-inline: auto;
  padding-inline: var(--site-gutter);
}

.hero-title {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: clamp(2.5rem, 5vw + 1rem, 4.5rem);
  line-height: 1.05;
  letter-spacing: -0.01em;
  color: var(--fg-primary);
  margin: 0 0 var(--space-6);
  max-width: 22ch;
}

.hero-subtitle {
  font-family: var(--font-sans);
  font-weight: 300;
  font-size: clamp(1rem, 0.7vw + 0.9rem, 1.35rem);
  line-height: 1.45;
  color: var(--fg-secondary);
  margin: 0 0 var(--space-7);
  max-width: 48rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}


/* === Button === */

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3rem;
  padding: 0 var(--space-5);
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.875rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-decoration: none;
  border: var(--hairline) solid transparent;
  border-radius: var(--radius-md);
  transition:
    color 160ms ease,
    background-color 160ms ease,
    border-color 160ms ease;
}

.button-primary {
  color: var(--fg-primary);
  background: var(--accent-muted);
  border-color: var(--border-strong);
}

.button-primary:hover,
.button-primary:focus-visible {
  color: var(--fg-primary);
  background: var(--hover-overlay);
  border-color: var(--fg-muted);
}

.button-secondary {
  color: var(--fg-primary);
  background: transparent;
  border-color: var(--border-strong);
}

.button-secondary:hover,
.button-secondary:focus-visible {
  color: var(--fg-primary);
  background: var(--accent-muted);
  border-color: var(--fg-muted);
}


/* === Sections === */

.section {
  padding-block: var(--space-10);
  border-top: var(--hairline) solid var(--border-subtle);
}

.section-inner {
  width: 100%;
  max-width: var(--site-max-width);
  margin-inline: auto;
  padding-inline: var(--site-gutter);
}

.section-grid {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 2fr);
  gap: var(--space-7);
  align-items: start;
}

.section-title {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: clamp(2rem, 3vw + 1rem, 3rem);
  line-height: 1.1;
  letter-spacing: -0.005em;
  color: var(--fg-primary);
  margin: 0;
  max-width: 36ch;
}

.section-body {
  font-family: var(--font-sans);
  font-weight: 400;
  font-size: 1.125rem;
  line-height: 1.85;
  color: var(--fg-primary);
}

.section-body p {
  margin: 0;
}

.section-body p + p {
  margin-top: var(--space-4);
}


/* === Contact channels === */

.contact-channels {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.contact-channel {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 4rem;
  height: 4rem;
  color: var(--fg-primary);
  background: transparent;
  border: var(--hairline) solid var(--border-strong);
  border-radius: var(--radius-md);
  transition:
    color 160ms ease,
    background-color 160ms ease,
    border-color 160ms ease;
}

.contact-channel:hover,
.contact-channel:focus-visible {
  color: var(--fg-primary);
  background: var(--accent-muted);
  border-color: var(--fg-muted);
}

.contact-channel svg {
  width: 1.5rem;
  height: 1.5rem;
}


/* === Footer === */

.site-footer {
  border-top: var(--hairline) solid var(--border-subtle);
  padding-block: var(--space-8) var(--space-6);
}

.site-footer-inner {
  width: 100%;
  max-width: var(--site-max-width);
  margin-inline: auto;
  padding-inline: var(--site-gutter);
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(0, 3fr);
  gap: var(--space-7);
  align-items: center;
}

.brand-supplementary {
  display: inline-flex;
  align-items: center;
  height: 1.8rem;
}

.brand-supplementary img {
  height: 100%;
  width: auto;
}

.disclaimers {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  font-family: var(--font-mono);
  font-size: 0.625rem;
  line-height: 1.35;
  letter-spacing: 0.02em;
  color: var(--fg-muted);
  text-align: right;
}

.disclaimers p {
  margin: 0;
}

/* Mixed-case running text needs a slightly larger size than the uppercase */
/* copyright to read at a comparable optical weight. */
.disclaimers p:not(.copyright) {
  font-size: 0.6875rem;
}

.disclaimers .copyright {
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--fg-secondary);
}


/* === Error page === */

.error-main {
  min-height: calc(100vh - var(--nav-height));
  min-height: calc(100svh - var(--nav-height));
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-block: var(--space-8);
}

.error-inner {
  width: 100%;
  max-width: var(--site-max-width);
  margin-inline: auto;
  padding-inline: var(--site-gutter);
}

.error-title {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: clamp(2.5rem, 5vw + 1rem, 4.5rem);
  line-height: 1.05;
  letter-spacing: -0.01em;
  color: var(--fg-primary);
  margin: 0 0 var(--space-5);
  max-width: 18ch;
}

.error-body {
  font-family: var(--font-sans);
  font-weight: 400;
  font-size: clamp(1rem, 0.7vw + 0.9rem, 1.35rem);
  line-height: 1.6;
  color: var(--fg-secondary);
  margin: 0 0 var(--space-7);
  max-width: 40rem;
}


/* === Responsive: narrow viewports === */

@media (max-width: 48rem) {
  :root {
    --site-gutter: var(--space-4);
  }

  .menu-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .nav-list {
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--bg-base);
    border-bottom: var(--hairline) solid var(--border-subtle);
  }

  .site-nav.is-open .nav-list {
    display: flex;
  }

  /* Error page nav lists only a single link; expose it inline in mobile */
  /* viewports, since there is no menu toggle to reveal a collapsed list. */
  .error-page .nav-list {
    position: static;
    display: flex;
    flex-direction: row;
    border-bottom: 0;
  }

  .error-page .nav-list .nav-link {
    border: var(--hairline) solid transparent;
    border-top: var(--hairline) solid transparent;
    border-radius: var(--radius-md);
    padding: var(--space-2) var(--space-3);
  }

  .nav-list .nav-link {
    border-radius: 0;
    border: 0;
    border-top: var(--hairline) solid var(--border-subtle);
    padding: var(--space-4) var(--site-gutter);
  }

  .nav-list .nav-link:first-child {
    border-top: 0;
  }

  .nav-list .nav-link:hover,
  .nav-list .nav-link:focus-visible,
  .nav-list .nav-link.is-active {
    border-color: var(--border-subtle);
  }

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

  .button {
    width: 100%;
  }

  .section {
    padding-block: var(--space-9);
  }

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

  .site-footer-inner {
    grid-template-columns: 1fr;
    gap: var(--space-5);
  }
}


/* === Reduced motion === */

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}