/* Base styles, navigation, and the shared two-pane shell. Colors come from tokens.css only. */

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-padding-top: var(--nav-h);
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: var(--fs-md);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

h1,
h2,
h3 {
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.01em;
}

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

a {
  color: inherit;
  text-decoration-color: var(--rule-strong);
  text-underline-offset: 0.2em;
}

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

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

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

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.skip-link {
  position: fixed;
  top: var(--space-2);
  left: var(--space-2);
  z-index: 100;
  padding: var(--space-2) var(--space-4);
  background: var(--bg);
  border: 1px solid var(--rule-strong);
  transform: translateY(-200%);
}

.skip-link:focus {
  transform: none;
}

/* Small mono label: section labels, spec keys, meta text */
.label {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  font-weight: 500;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--text-muted);
}

.chip {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  border: 1px solid var(--rule-strong);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  font-weight: 500;
  letter-spacing: 0.04em;
  line-height: 1.5;
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.button {
  display: inline-block;
  padding: var(--space-3) var(--space-5);
  border: 1px solid var(--text);
  font-size: var(--fs-sm);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-decoration: none;
  transition: background-color var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out);
}

.button:hover,
.button:focus-visible {
  background: var(--text);
  color: var(--bg);
}

/* An image that opens the expanded view on click (Site.zoomable in js/media.js) */
.zoom {
  display: block;
  width: 100%;
  cursor: zoom-in;
}

.zoom img {
  transition: opacity var(--dur-fast) var(--ease-out);
}

.zoom:hover img {
  opacity: 0.9;
}

.zoom:focus-visible {
  outline-offset: 2px;
}

.caption {
  margin-top: var(--space-3);
  max-width: var(--measure);
  font-size: var(--fs-sm);
  color: var(--text-muted);
}

/* An empty slot that names what is pending. Never a stand-in image. */
.placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 180px;
  padding: var(--space-5);
  border: 1px dashed var(--rule-strong);
  background: var(--surface);
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  letter-spacing: 0.02em;
  text-align: center;
  color: var(--text-muted);
}

.notice {
  padding: var(--space-6) var(--gutter);
  color: var(--text-muted);
}

/* Centered single-message page (404) */
.message {
  display: grid;
  place-content: center;
  gap: var(--space-4);
  min-height: 100vh;
  padding: var(--nav-h) var(--gutter);
  text-align: center;
}

/* Photographer credit in the bottom-left corner of an image (its box must be positioned) */
.credit-tag {
  position: absolute;
  left: 0;
  bottom: 0;
  max-width: 100%;
  padding: 2px 6px;
  overflow-wrap: anywhere;
  background: var(--credit-tag-bg);
  font-size: 0.625rem;
  line-height: 1.4;
  letter-spacing: 0.02em;
  color: var(--text);
  pointer-events: none;
}

/* ---------- Expanded view (a modal dialog; any click closes it) ---------- */

.lightbox {
  width: 100vw;
  height: 100vh;
  height: 100svh;
  max-width: none;
  max-height: none;
  margin: 0;
  padding: var(--space-8) var(--gutter) var(--space-6);
  border: 0;
  background: none;
  color: var(--text);
  overflow: hidden;
  cursor: zoom-out;
}

.lightbox[open] {
  display: flex;
  align-items: center;
  justify-content: center;
}

.lightbox::backdrop {
  background: var(--lightbox-backdrop);
}

.lightbox__close {
  position: absolute;
  top: var(--space-4);
  right: var(--gutter);
  padding: var(--space-2) var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  font-weight: 500;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
}

.lightbox__figure {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  min-width: 0;
  min-height: 0;
  max-height: 100%;
}

.lightbox__frame {
  position: relative;
  min-height: 0;
}

.lightbox__img {
  width: auto;
  height: auto;
  max-width: calc(100vw - 2 * var(--gutter));
  max-height: calc(100svh - 10rem);
}

.lightbox__caption {
  max-width: var(--measure);
  font-size: var(--fs-sm);
  text-align: center;
  color: var(--text-muted);
}

/* ---------- Navigation: text only, no panel ---------- */

.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: center;
  padding-inline: var(--gutter);
  pointer-events: none;
}

/* Soft fade from the page background so the links stay legible over video and scrolled content */
.nav::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: calc(var(--nav-h) * 1.9);
  background: var(--nav-fade);
  pointer-events: none;
  z-index: -1;
}

/* Projects and Baja SAE: the nav has its own strip above the panes, so the fade must not
   reach down over the content (on phones it also stops text ghosting behind the links). */
.page-fixed .nav::before {
  height: var(--nav-h);
  background: var(--bg);
}

.nav__list {
  display: flex;
  align-items: center;
  gap: clamp(var(--space-5), 3.4vw, var(--space-7));
  pointer-events: auto;
}

.nav__list li {
  display: flex;
}

.nav__link {
  display: block;
  padding: var(--space-2) 2px;
  border-bottom: 1px solid var(--clear);
  font-size: var(--fs-sm);
  font-weight: 500;
  letter-spacing: var(--tracking-label);
  line-height: 1.2;
  text-transform: uppercase;
  text-decoration: none;
  white-space: nowrap;
  opacity: 0.8;
  transition: opacity var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out);
}

.nav__link:hover,
.nav__link:focus-visible,
.nav__link[aria-current] {
  opacity: 1;
}

.nav__link[aria-current] {
  border-bottom-color: var(--accent);
  font-weight: 600;
}

.nav__toggle {
  display: none;
  margin-left: auto;
  padding: var(--space-2) 2px;
  font-size: var(--fs-sm);
  font-weight: 500;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  pointer-events: auto;
}

@media (max-width: 767.98px) {
  .nav {
    justify-content: flex-end;
  }

  .nav__toggle {
    display: block;
    position: relative;
    z-index: 2;
  }

  .nav__list {
    display: none;
  }

  .nav[data-open="true"] .nav__list {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: var(--space-6);
    position: fixed;
    inset: 0;
    z-index: 1;
    padding: var(--nav-h) var(--gutter) var(--space-7);
    background: var(--menu-sheet);
  }

  .nav[data-open="true"] .nav__link {
    font-size: var(--fs-lg);
  }
}

/* ---------- Two-pane shell (Projects, Baja SAE) ---------- */

.shell {
  padding-top: var(--nav-h);
}

/* The pane takes keyboard focus so it can be scrolled with the arrow and page keys */
.shell__pane:focus-visible {
  outline-offset: -2px;
}

.block {
  padding: var(--space-7) var(--gutter);
  border-top: 1px solid var(--rule);
}

.block__label {
  margin-bottom: var(--space-5);
}

.block__text {
  max-width: var(--measure);
  color: var(--text-muted);
}

.block__text + .media-grid,
.block__text + .placeholder,
.block__text + figure {
  margin-top: var(--space-5);
}

.media-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr));
  gap: var(--space-5);
  align-items: start;
}

.media-grid img,
.figure-wide img {
  width: 100%;
}

@media (min-width: 768px) {
  .page-fixed {
    overflow: hidden;
  }

  .shell {
    position: fixed;
    inset: var(--nav-h) 0 0 0;
    padding-top: 0;
    display: grid;
    grid-template-columns: var(--list-w) minmax(0, 1fr);
  }

  .shell__side {
    min-height: 0;
    border-right: 1px solid var(--rule);
  }

  .shell__pane {
    min-height: 0;
    overflow-y: auto;
    overscroll-behavior: contain;
  }

  .block {
    padding-inline: var(--space-6);
  }
}

@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}