/*
 * Grand Challenge Labs shared visual language.
 *
 * This file is loaded after the programme and documentary styles. It owns the
 * public shell and common components while leaving scoped documentary palettes
 * and artifact-specific layouts intact.
 */

:root {
  --gcl-navy-950: #061224;
  --gcl-navy-900: #081a31;
  --gcl-navy-800: #102d4c;
  --gcl-navy-700: #173f66;
  --gcl-parchment-50: #fffaf0;
  --gcl-parchment-100: #f6edda;
  --gcl-parchment-200: #eadbbc;
  --gcl-gold-300: #e8c777;
  --gcl-gold-400: #d5ad55;
  --gcl-gold-500: #b98a34;
  --gcl-red-500: #a43f32;
  --gcl-focus: #f2ce75;
  --gcl-shadow: 0 1.5rem 4rem rgba(6, 18, 36, 0.12);

  --gc-paper: var(--gcl-parchment-50);
  --gc-paper-deep: var(--gcl-parchment-100);
  --gc-ink: var(--gcl-navy-950);
  --gc-muted: #625d54;
  --gc-rule: #d5c5a4;
  --gc-signal: var(--gcl-gold-500);
  --gc-signal-dark: #8a641e;
  --gc-white: #fffdf8;

  --md-primary-fg-color: var(--gcl-navy-950);
  --md-primary-fg-color--light: var(--gcl-navy-800);
  --md-primary-fg-color--dark: #030b17;
  --md-accent-fg-color: var(--gcl-gold-400);
  --md-typeset-a-color: #75530f;
}

[data-md-color-scheme="default"] {
  --md-default-bg-color: var(--gcl-parchment-50);
  --md-default-fg-color: var(--gcl-navy-950);
  --md-default-fg-color--light: #625d54;
  --md-code-bg-color: #efe5d2;
  --md-footer-bg-color: var(--gcl-navy-950);
  --md-footer-bg-color--dark: #030b17;
}

[data-md-color-scheme="slate"] {
  --gc-paper: #0b192b;
  --gc-paper-deep: #10243b;
  --gc-ink: #f8efd9;
  --gc-muted: #c4bba9;
  --gc-rule: #38506b;
  --gc-signal: var(--gcl-gold-300);
  --gc-signal-dark: #f2d88f;
  --gc-white: var(--gcl-navy-950);

  --md-default-bg-color: #0b192b;
  --md-default-fg-color: #f8efd9;
  --md-default-fg-color--light: #c4bba9;
  --md-typeset-a-color: #f0cf7d;
  --md-code-bg-color: #122841;
  --md-footer-bg-color: #030b17;
  --md-primary-fg-color: #061224;
  color-scheme: dark;
}

html {
  background: var(--gcl-navy-950);
}

body {
  background:
    linear-gradient(90deg, color-mix(in srgb, var(--gc-rule) 12%, transparent) 1px, transparent 1px),
    var(--gc-paper);
  background-size: 5rem 100%;
}

::selection {
  color: var(--gcl-navy-950);
  background: var(--gcl-gold-300);
}

:where(a, button, input, summary):focus-visible {
  outline: 3px solid var(--gcl-focus) !important;
  outline-offset: 3px;
}

/* Public shell */

.md-header {
  min-height: 3.8rem;
  background:
    linear-gradient(90deg, rgba(232, 199, 119, 0.1), transparent 24rem),
    var(--gcl-navy-950);
  border-bottom: 1px solid rgba(232, 199, 119, 0.34);
}

.md-header__inner {
  min-height: 3.8rem;
}

.md-header__button.md-logo {
  margin-right: 0.55rem;
  padding: 0.4rem;
}

.md-header__button.md-logo img,
.md-header__button.md-logo svg {
  width: 2rem;
  height: 2rem;
}

.md-header__title {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.015em;
}

.md-header__topic:first-child {
  color: var(--gcl-parchment-50);
}

.md-search__form {
  background: rgba(255, 250, 240, 0.07);
  border: 1px solid rgba(232, 199, 119, 0.18);
  border-radius: 0;
}

.md-search__form:hover,
.md-search__form:focus-within {
  background: rgba(255, 250, 240, 0.12);
  border-color: rgba(232, 199, 119, 0.48);
}

.md-search__input::placeholder {
  color: rgba(255, 250, 240, 0.72);
}

.md-tabs {
  background: var(--gcl-navy-900);
  border-top: 0;
  border-bottom: 1px solid rgba(232, 199, 119, 0.22);
}

.md-tabs__link {
  position: relative;
  margin-top: 0;
  padding: 0.95rem 0 0.85rem;
  color: rgba(255, 250, 240, 0.7);
  opacity: 1;
}

.md-tabs__link::after {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 2px;
  background: var(--gcl-gold-300);
  content: "";
  opacity: 0;
  transform: scaleX(0.4);
  transition: opacity 160ms ease, transform 160ms ease;
}

.md-tabs__item--active .md-tabs__link,
.md-tabs__link:hover {
  color: var(--gcl-parchment-50);
}

.md-tabs__item--active .md-tabs__link::after,
.md-tabs__link:hover::after {
  opacity: 1;
  transform: scaleX(1);
}

.md-sidebar {
  background: color-mix(in srgb, var(--gc-paper) 94%, transparent);
}

.md-nav__title {
  color: var(--gc-ink);
  font-family: Georgia, "Times New Roman", serif;
  font-weight: 600;
}

.md-nav__link {
  line-height: 1.35;
}

.md-nav__link--active,
.md-nav__link:is(:focus, :hover) {
  color: var(--gc-signal-dark) !important;
}

.md-nav__link--active {
  font-weight: 800;
}

.md-nav__link--active::before {
  color: var(--gc-signal);
  content: "◆";
  font-size: 0.48rem;
  margin-right: 0.45rem;
  vertical-align: 0.18em;
}

.md-top {
  background: var(--gcl-navy-900);
  border: 1px solid rgba(232, 199, 119, 0.4);
  border-radius: 0;
  box-shadow: var(--gcl-shadow);
}

/* Editorial surface */

.md-main {
  background:
    radial-gradient(circle at 88% 8%, color-mix(in srgb, var(--gc-signal) 7%, transparent), transparent 24rem),
    transparent;
}

.md-content__inner {
  max-width: 57rem;
}

.md-typeset > h1:first-child::before {
  color: var(--gc-signal-dark);
  content: "Grand Challenge Labs · Mathematics Programme";
}

.md-typeset h1 {
  color: var(--gc-ink);
  font-size: clamp(2.35rem, 4.6vw, 3.65rem);
  letter-spacing: -0.025em;
}

.md-typeset h2 {
  position: relative;
  padding-top: 0.45rem;
}

.md-typeset h2::before {
  position: absolute;
  top: 0;
  left: 0;
  width: 2.5rem;
  height: 2px;
  background: var(--gc-signal);
  content: "";
}

.md-typeset h3 {
  color: var(--gc-ink);
}

.md-typeset a {
  text-decoration-color: color-mix(in srgb, var(--gc-signal) 75%, transparent);
}

.md-typeset a:hover {
  color: var(--gc-signal-dark);
  text-decoration-color: currentColor;
}

.md-typeset code {
  border: 1px solid color-mix(in srgb, var(--gc-rule) 78%, transparent);
  border-radius: 0;
}

.md-typeset pre > code {
  border-left: 3px solid var(--gc-signal);
}

.md-typeset .admonition,
.md-typeset details {
  background: color-mix(in srgb, var(--gc-paper-deep) 72%, transparent);
  border-left: 3px solid var(--gc-signal);
}

.md-typeset .admonition-title,
.md-typeset summary {
  background: color-mix(in srgb, var(--gc-signal) 10%, var(--gc-paper-deep));
}

.md-typeset table:not([class]) {
  background: color-mix(in srgb, var(--gc-paper) 96%, transparent);
  border-top: 2px solid var(--gcl-navy-900);
}

.md-typeset table:not([class]) th {
  background: var(--gcl-navy-900);
  color: var(--gcl-parchment-50);
}

.md-typeset table:not([class]) tr:hover td {
  background: color-mix(in srgb, var(--gc-signal) 6%, transparent);
}

/* GCL frontispiece */

.frontispiece {
  background:
    linear-gradient(90deg, var(--gc-paper-deep) 0%, var(--gc-paper-deep) 40%, color-mix(in srgb, var(--gc-paper-deep) 82%, transparent) 62%, transparent 100%),
    linear-gradient(180deg, color-mix(in srgb, var(--gcl-gold-300) 9%, transparent), transparent 45%),
    var(--gc-paper-deep);
  border-top: 3px solid var(--gcl-gold-400);
  border-bottom: 1px solid var(--gc-rule);
}

.frontispiece::before {
  position: absolute;
  z-index: 1;
  top: 0;
  bottom: 0;
  left: max(1rem, calc((100vw - 76rem) / 2));
  width: 1px;
  background: linear-gradient(var(--gcl-gold-400), transparent 35%);
  content: "";
  opacity: 0.7;
  pointer-events: none;
}

.frontispiece__field {
  opacity: 0.58;
  filter: saturate(0.88) contrast(1.04);
  mix-blend-mode: multiply;
}

[data-md-color-scheme="slate"] .frontispiece__field {
  filter: sepia(0.15) saturate(0.82) brightness(1.65);
  mix-blend-mode: screen;
  opacity: 0.32;
}

.frontispiece__inner {
  min-height: calc(100svh - 7.15rem);
}

.frontispiece__edition {
  max-width: 46rem;
  color: var(--gc-signal-dark);
  border-bottom: 1px solid color-mix(in srgb, var(--gc-signal) 40%, transparent);
  padding-bottom: 0.75rem;
}

.frontispiece__edition span:first-child {
  position: relative;
  padding-left: 1.3rem;
}

.frontispiece__edition span:first-child::before {
  position: absolute;
  top: 50%;
  left: 0;
  width: 0.56rem;
  height: 0.56rem;
  background: var(--gcl-gold-400);
  border: 2px solid var(--gcl-navy-900);
  content: "";
  transform: translateY(-50%) rotate(45deg);
}

.frontispiece h1 {
  color: var(--gcl-navy-950);
  letter-spacing: -0.055em;
  text-wrap: balance;
}

[data-md-color-scheme="slate"] .frontispiece h1 {
  color: var(--gcl-parchment-50);
}

.frontispiece__thesis {
  color: var(--gc-ink);
}

.frontispiece__summary {
  color: var(--gc-muted);
}

.gc-button {
  position: relative;
  min-height: 3rem;
  padding-inline: 1.15rem;
  overflow: hidden;
  border-color: var(--gcl-navy-900);
  color: var(--gcl-navy-900) !important;
}

.gc-button::after {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 3px;
  background: var(--gcl-gold-400);
  content: "";
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 160ms ease;
}

.gc-button:hover::after {
  transform: scaleX(1);
}

.gc-button--primary {
  background: var(--gcl-navy-900);
  border-color: var(--gcl-navy-900);
  color: var(--gcl-parchment-50) !important;
}

.gc-button--primary::after {
  transform: scaleX(1);
}

[data-md-color-scheme="slate"] .gc-button {
  border-color: var(--gcl-gold-300);
  color: var(--gcl-parchment-50) !important;
}

[data-md-color-scheme="slate"] .gc-button--primary {
  background: var(--gcl-navy-950);
}

.programme-spine {
  background: color-mix(in srgb, var(--gc-paper) 70%, transparent);
  border-top: 1px solid color-mix(in srgb, var(--gcl-navy-900) 45%, var(--gc-rule));
  border-bottom: 1px solid color-mix(in srgb, var(--gcl-navy-900) 45%, var(--gc-rule));
  backdrop-filter: blur(6px);
}

.programme-spine__stage:hover {
  background: color-mix(in srgb, var(--gc-signal) 12%, transparent);
}

.programme-spine__number,
.programme-spine__arrow {
  color: var(--gc-signal-dark);
}

.programme-spine__name {
  color: var(--gcl-navy-900);
}

[data-md-color-scheme="slate"] .programme-spine__name {
  color: var(--gcl-parchment-50);
}

.gc-kicker {
  color: var(--gc-signal-dark);
}

.gc-section {
  border-bottom-color: color-mix(in srgb, var(--gc-rule) 85%, transparent);
}

.gc-section--manifesto {
  position: relative;
}

.gc-section--manifesto::before,
.gc-section--manifesto::after {
  display: inline-block;
  width: clamp(2rem, 8vw, 6rem);
  height: 1px;
  margin: 0 1rem 0.28rem;
  background: var(--gc-signal);
  content: "";
}

.progress-ladder,
.domain-brief {
  border-top-color: var(--gcl-navy-900);
}

.progress-ladder > div:hover {
  box-shadow: inset 0 3px var(--gc-signal);
}

.claim-status {
  background: color-mix(in srgb, var(--gc-paper) 86%, transparent);
}

.claim-status--certified {
  background: var(--gcl-navy-900);
  border-color: var(--gcl-navy-900);
  color: var(--gcl-parchment-50);
}

.claim-status--rejected {
  color: var(--gcl-red-500);
  text-decoration-color: var(--gcl-red-500);
}

.entry-links a {
  position: relative;
  padding-right: 1rem;
}

.entry-links a::after {
  position: absolute;
  top: 50%;
  right: 0.15rem;
  color: var(--gc-signal-dark);
  content: "↗";
  opacity: 0;
  transform: translate(-0.35rem, -50%);
  transition: opacity 160ms ease, transform 160ms ease;
}

.entry-links a:hover::after {
  opacity: 1;
  transform: translate(0, -50%);
}

/* Footer and mobile shell */

.md-footer {
  background:
    linear-gradient(90deg, rgba(232, 199, 119, 0.08), transparent 28rem),
    var(--gcl-navy-950);
  border-top: 3px solid var(--gcl-gold-400);
}

.md-footer__link {
  color: var(--gcl-parchment-50);
}

.md-footer__title {
  font-family: Georgia, "Times New Roman", serif;
}

.md-footer-meta {
  background: #030b17;
  border-top-color: rgba(232, 199, 119, 0.2);
}

@media (max-width: 76.234375em) {
  .md-header__title {
    font-size: 0.9rem;
  }
}

@media (max-width: 760px) {
  body {
    background-size: 3.5rem 100%;
  }

  .md-header {
    min-height: 3.3rem;
  }

  .md-header__inner {
    min-height: 3.3rem;
  }

  .frontispiece {
    border-top-width: 2px;
  }

  .frontispiece::before {
    left: 0.8rem;
  }

  .frontispiece__inner {
    min-height: calc(100svh - 3.3rem);
    padding-inline: 1.35rem;
  }

  .frontispiece__edition {
    padding-left: 0.1rem;
  }

  .frontispiece h1 {
    letter-spacing: -0.04em;
  }

  .gc-section--manifesto::before,
  .gc-section--manifesto::after {
    width: 1.5rem;
    margin-inline: 0.45rem;
  }

  .md-nav--primary .md-nav__title {
    color: var(--gcl-parchment-50);
    background: var(--gcl-navy-950);
    border-bottom: 2px solid var(--gcl-gold-400);
  }
}

@media print {
  body {
    background: #fff;
  }

  .frontispiece {
    border-top-color: #000;
  }
}