/* ==========================================================================
   Orient Innovation Park
   Global layer: reset, base typography, controls, header, footer.
   ========================================================================== */

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

* {
  margin: 0;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h, 72px) + 16px);
}

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  letter-spacing: var(--tr-body);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

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

img {
  height: auto;
  background: var(--bg-sunken);
}

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

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

address {
  font-style: normal;
}

:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
}

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

/* ------------------------------------------------------------------ a11y */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: var(--sp-4);
  top: var(--sp-4);
  z-index: 100;
  padding: 12px 20px;
  background: var(--accent);
  color: var(--accent-ink);
  font-weight: 700;
  transform: translateY(-200%);
  transition: transform var(--dur) var(--ease);
}

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

/* ---------------------------------------------------------------- buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.625rem;
  min-height: 48px;
  padding: 0 1.5rem;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-size: var(--fs-body);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
  white-space: nowrap;
  transition:
    background-color var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    color var(--dur) var(--ease),
    transform var(--dur-fast) var(--ease);
}

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

.btn__icon {
  flex: none;
  width: 1.125rem;
  height: 1.125rem;
  transition: transform var(--dur) var(--ease);
}

.btn:hover .btn__icon {
  transform: translateX(3px);
}

.btn--primary {
  background: var(--accent);
  color: var(--accent-ink);
  border-color: var(--accent);
}

.btn--primary:hover {
  background: var(--accent-strong);
  border-color: var(--accent-strong);
}

.btn--ghost {
  background: transparent;
  color: var(--fg);
  border-color: var(--line-strong);
}

.btn--ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.btn--sm {
  min-height: 42px;
  padding: 0 1.125rem;
  font-size: var(--fs-small);
}

/* Text link with a rule that draws in on hover. */
.link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: var(--fs-small);
  color: var(--fg);
  padding-bottom: 2px;
  background-image: linear-gradient(var(--accent), var(--accent));
  background-repeat: no-repeat;
  background-position: 0 100%;
  background-size: 100% 1px;
  transition: color var(--dur) var(--ease), background-size var(--dur) var(--ease);
}

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

.link__icon {
  flex: none;
  width: 1rem;
  height: 1rem;
}

/* ----------------------------------------------------------------- header */
.header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: var(--z-header);
  height: var(--header-h, 72px);
  display: flex;
  align-items: center;
  background: color-mix(in srgb, var(--bg) 84%, transparent);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.header__inner {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-6);
}

.header__logo img {
  width: 190px;
  height: auto;
}

/* The wordmark is a light brass gradient. On a light surface the pale stops
   wash out, so the mark is deepened for the light theme only. The shape and
   the brand hue are unchanged. */
:root[data-theme='light'] .header__logo img,
:root[data-theme='light'] .footer__brand img {
  filter: brightness(0.68) saturate(1.4);
}

.nav {
  display: none;
  align-items: center;
  gap: clamp(1rem, 2vw, 1.875rem);
}

.nav__link {
  font-size: var(--fs-small);
  font-weight: 600;
  color: var(--fg-muted);
  padding-block: 6px;
  position: relative;
  transition: color var(--dur) var(--ease);
}

.nav__link::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur) var(--ease);
}

.nav__link:hover,
.nav__link[aria-current='true'] {
  color: var(--fg);
}

.nav__link:hover::after,
.nav__link[aria-current='true']::after {
  transform: scaleX(1);
}

.header__actions {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
}

.header__cta {
  display: none;
}

@media (min-width: 640px) {
  .header__cta {
    display: inline-flex;
  }
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--line-strong);
  color: var(--fg-muted);
  transition:
    color var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}

.theme-toggle:hover {
  color: var(--accent);
  border-color: var(--accent-line);
}

.theme-toggle svg {
  width: 1.125rem;
  height: 1.125rem;
}

:root[data-theme='light'] .icon-moon,
:root:not([data-theme='light']) .icon-sun {
  display: none;
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line-strong);
  color: var(--fg);
}

.nav-toggle__bars,
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  display: block;
  width: 18px;
  height: 1.5px;
  background: currentColor;
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: '';
  position: absolute;
}

.nav-toggle__bars::before {
  transform: translateY(-6px);
}

.nav-toggle__bars::after {
  transform: translateY(6px);
}

.nav-toggle[aria-expanded='true'] .nav-toggle__bars {
  background: transparent;
}

.nav-toggle[aria-expanded='true'] .nav-toggle__bars::before {
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded='true'] .nav-toggle__bars::after {
  transform: rotate(-45deg);
}

/* Mobile navigation panel */
.mobile-nav {
  position: fixed;
  inset: var(--header-h, 72px) 0 0 0;
  z-index: var(--z-panel);
  background: var(--bg);
  border-top: 1px solid var(--line);
  padding: var(--sp-6) var(--gutter) var(--sp-8);
  display: grid;
  align-content: start;
  gap: var(--sp-2);
  transform: translateY(-8px);
  opacity: 0;
  visibility: hidden;
  transition:
    opacity var(--dur) var(--ease),
    transform var(--dur) var(--ease),
    visibility var(--dur) var(--ease);
}

.mobile-nav.is-open {
  opacity: 1;
  transform: none;
  visibility: visible;
}

.mobile-nav__link {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: var(--tr-display);
  padding-block: var(--sp-3);
  border-bottom: 1px solid var(--line);
}

.mobile-nav .btn {
  margin-top: var(--sp-5);
}

@media (min-width: 1024px) {
  .nav {
    display: flex;
  }

  .nav-toggle,
  .mobile-nav {
    display: none;
  }
}

/* ----------------------------------------------------------------- footer */
.footer {
  background: var(--bg-sunken);
  border-top: 1px solid var(--line);
  padding-block: clamp(3rem, 5vw, 4.5rem) var(--sp-6);
}

.footer__grid {
  display: grid;
  gap: clamp(2rem, 4vw, 3.5rem);
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
}

.footer__brand img {
  height: 96px;
  width: auto;
}

.footer__title {
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-faint);
  margin-bottom: var(--sp-4);
}

.footer__list {
  display: grid;
  gap: 0.625rem;
  font-size: var(--fs-small);
}

.footer__list a {
  color: var(--fg-muted);
  transition: color var(--dur) var(--ease);
}

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

.footer__contact {
  font-size: var(--fs-small);
  color: var(--fg-muted);
  display: grid;
  gap: 0.375rem;
}

.footer__contact strong {
  color: var(--fg);
  font-weight: 700;
}

.footer__contact a {
  color: var(--fg-muted);
  transition: color var(--dur) var(--ease);
}

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

/* Partner logo lockup. Cream plates keep the supplied logo artwork
   legible on both themes without recolouring the marks. */
.partners {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-4);
  align-items: center;
}

.partner {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 148px;
  padding: 0.875rem 1.25rem;
  background: var(--bg-plate);
  border: 1px solid var(--line);
}

.partner img {
  height: 30px;
  width: auto;
}

.footer__base {
  margin-top: clamp(2.5rem, 5vw, 3.5rem);
  padding-top: var(--sp-5);
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--sp-3);
  font-size: var(--fs-small);
  color: var(--fg-faint);
}

.footer__base a {
  color: var(--fg-muted);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color var(--dur) var(--ease);
}

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

/* --------------------------------------------------------------- utilities */
.lead {
  font-size: var(--fs-lead);
  line-height: var(--lh-body);
  color: var(--fg-muted);
  max-width: 58ch;
}

.muted {
  color: var(--fg-muted);
}

.stack-sm {
  display: grid;
  gap: var(--sp-3);
}

.stack-md {
  display: grid;
  gap: var(--sp-5);
}

.cluster {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--sp-3);
}