/* tdarius.dev – shared styles for index.html and 404.html */

:root {
  color-scheme: light dark;
  --text: #1a1a1a;
  --text-body: #333;
  --text-muted: #666;
  --page-bg: #f3f2ef;
  --project-bg: #f3f4f6;   /* set per project from projects.json / config.json, used by dark mode */
  --chip: rgba(0, 0, 0, 0.05);
  --chip-border: rgba(0, 0, 0, 0.12);
  --demo-bg: #fff;
  --surface: #ffffff;
  --on-text: #fff;         /* text placed on a var(--text) background */
  --dot: #cfcfcf;
  --dot-hover: #999;
  --dot-active: #333;
  --focus: #2563eb;
  --shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
  --shadow-small: 0 4px 20px rgba(0, 0, 0, 0.15);
  --radius: 12px;
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-snap-type: y mandatory;
  /* No scroll-behavior: smooth here: on phones it interferes with the native
     snap after a swipe (WebKit bug 245722). Dot and keyboard navigation pass
     behavior: 'smooth' to scrollIntoView instead (see goTo in app.js). */
  /* the dot navigation replaces the scrollbar */
  scrollbar-width: none;
}

html::-webkit-scrollbar {
  display: none;
}

body {
  font-family: var(--font);
  color: var(--text-body);
  background: var(--page-bg);
}

a {
  color: inherit;
}

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

/* sections receive focus from the navigation (see goTo in app.js); no ring around a whole slide */
.project:focus-visible {
  outline: none;
}

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

/* ---------- site header ---------- */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1100;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 28px;
  pointer-events: none; /* only the links and the toggle are clickable */
}

.site-header a {
  pointer-events: auto;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text);
}

.site-header nav {
  display: flex;
  align-items: center;
  gap: 18px;
}

.site-header nav a {
  color: var(--text-muted);
}

.site-header nav a:hover {
  color: var(--text);
}

.theme-toggle {
  pointer-events: auto;
  width: 34px;
  height: 34px;
  padding: 0;
  border: 1px solid var(--chip-border);
  border-radius: 50%;
  background: var(--chip);
  color: var(--text);
  font: inherit;
  font-size: 1rem;
  line-height: 1;
  cursor: pointer;
}

.theme-toggle:hover {
  background: var(--text);
  color: var(--on-text);
}

/* the intro already shows the name, so name and links appear once you scroll */
.site-name,
.site-link {
  transition: opacity 0.3s ease;
}

.site-header.hidden .site-name,
.site-header.hidden .site-link {
  opacity: 0;
  pointer-events: none;
}

/* ---------- project sections ---------- */

/* Light mode is neutral; the project colour (--project-bg) only tints dark mode */
.project {
  position: relative;
  /* svh, not dvh: a snapped slide must not resize while the phone's address bar
     collapses mid-swipe, or the snap points move under the finger and the page
     wobbles before it settles (WebKit bug 266835). */
  min-height: 100vh;
  min-height: 100svh;
  scroll-snap-align: start;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 80px 100px 80px 80px;
  background: var(--page-bg);
}

.project-content {
  display: flex;
  align-items: center;
  gap: 60px;
  width: 100%;
  max-width: 1400px;
}

/* alternate text/demo sides */
.project:nth-child(even) .project-content {
  flex-direction: row-reverse;
}

.text-field,
.demo-field {
  flex: 1 1 0;
  min-width: 0;
}

.text-field {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.project-title {
  font-size: clamp(1.8rem, 1.2rem + 2vw, 2.5rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.015em;
  color: var(--text);
}

.project-meta {
  display: flex;
  flex-wrap: wrap;
  column-gap: 0.5em;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
}

/* "Context · Period", wraps between the two halves on narrow screens */
.project-meta span {
  white-space: nowrap;
}

.project-meta span + span::before {
  content: "·";
  margin-right: 0.5em;
}

.project-abstract {
  font-size: 1.1rem;
  line-height: 1.7;
  max-width: 600px;
}

.project-highlight {
  padding-left: 14px;
  border-left: 3px solid var(--text);
  font-size: 1.02rem;
  font-weight: 500;
  line-height: 1.55;
  color: var(--text);
  max-width: 600px;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  list-style: none;
}

.tag {
  padding: 3px 10px;
  border: 1px solid var(--chip-border);
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-body);
  background: var(--chip);
}

.text-link {
  color: var(--text);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: var(--text-muted);
}

.text-link:hover {
  text-decoration-color: currentColor;
}

/* "More" / "Less" inside the abstract; only phones show it (see the small-screens section) */
.abstract-toggle {
  display: none;
  padding: 0;
  border: 0;
  background: none;
  font: inherit;
  font-weight: 500;
  color: var(--text);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: var(--text-muted);
  cursor: pointer;
}

.abstract-toggle:hover {
  text-decoration-color: currentColor;
}

/* ---------- buttons and links ---------- */

.project-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 4px;
}

.button {
  display: inline-flex;
  align-items: center;
  padding: 8px 16px;
  border: 1.5px solid currentColor;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  color: var(--text);
  transition: background 0.2s ease, color 0.2s ease;
}

.button:hover {
  background: var(--text);
  color: var(--on-text);
}

.button-large {
  padding: 14px 28px;
  font-size: 1.05rem;
}

.button-primary {
  background: var(--text);
  color: var(--on-text);
  box-shadow: var(--shadow-small);
}

.button-primary:hover {
  transform: translateY(-2px);
}

/* ---------- intro section ---------- */

/* The intro has two layouts. By default it is three full-height screens (text,
   publications + awards, project index), each centred like a project slide. On
   big windows (media query below) it is a 2x2 grid on one screen, where the
   screen wrappers dissolve and the four blocks are placed by grid area. The
   double class outweighs the phone padding set on .project. */
.project.intro {
  padding-top: 0;
  padding-bottom: 0;
  /* Stacked, the section is three screens tall. Safari treats an oversized snap
     area as free-scrolling and ignores the snap points of the screens inside. */
  scroll-snap-align: none;
}

.intro .project-content {
  flex-direction: column;
  gap: 0;
}

.intro-main,
.intro-aside {
  display: contents;
}

.intro-screen {
  display: flex;
  flex-direction: column;
  justify-content: center;
  width: 100%;
  max-width: 760px; /* a readable line length on tablets and narrow windows */
  min-height: 100vh;
  min-height: 100svh; /* svh for the same reason as .project */
  padding: 56px 0; /* header clearance on top, the same below so the content is truly centred */
  scroll-snap-align: start;
}

.intro-screen > .text-field {
  /* unlike a project slide's text block, this one must not grow to share the row with a demo */
  flex: none;
}

.intro-screen.screen-publications { order: 1; } /* text stays first */
.intro-screen.screen-index { order: 2; }

.intro-publications + .intro-awards {
  margin-top: 64px;
}

/* the grid, where it fits on one screen */
@media (min-width: 1200px) and (min-height: 760px) {
  .project.intro {
    padding: 40px 72px 40px 56px; /* the right side also clears the progress bar */
    scroll-snap-align: start; /* one screen again, so it snaps like any slide */
  }

  .intro .project-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-areas:
      "text index"
      "publications awards";
    column-gap: 48px;
    row-gap: 32px;
    align-items: center;
  }

  .intro-screen {
    display: contents;
  }

  .intro .text-field {
    gap: 12px;
  }

  .intro-text { grid-area: text; }
  .intro-index { grid-area: index; }
  .intro-publications { grid-area: publications; align-self: stretch; }
  .intro-awards { grid-area: awards; align-self: stretch; }

  .intro-publications + .intro-awards {
    margin-top: 0;
  }
}

/* the intro's type is one notch smaller than a project slide's so the grid fits a laptop screen */
.intro .project-abstract {
  font-size: 0.94rem;
  line-height: 1.5;
}

.intro .project-highlight {
  font-size: 0.94rem;
  line-height: 1.45;
}

.intro-name {
  font-size: clamp(2rem, 1.2rem + 2vw, 3rem);
}

.intro-tagline {
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--text);
  margin-top: -6px;
}

.intro-heading {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.publication-list,
.index-list {
  list-style: none;
}

.publication {
  display: flex;
  flex-direction: column;
  gap: 2px;
  max-width: 600px;
  line-height: 1.5;
}

.publication + .publication {
  margin-top: 10px;
}

.publication-title {
  font-size: 0.94rem;
  font-weight: 600;
  color: var(--text);
}

.publication-authors,
.publication-venue,
.publication-note,
.index-meta {
  font-size: 0.86rem;
  color: var(--text-muted);
}

.publication-links {
  display: flex;
  gap: 14px;
  font-size: 0.86rem;
}

.publication-note {
  margin-top: 6px;
}

/* reference material lives in cards: publications, awards, project index */
.intro-publications,
.intro-index,
.intro-awards {
  padding: 16px 22px;
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.index-list li {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  column-gap: 12px;
  padding: 4px 0;
  border-top: 1px solid var(--chip-border);
}

.index-list .index-meta {
  text-align: right;
}

.index-list li:first-child {
  border-top: 0;
}

.index-link {
  font-size: 0.94rem;
  font-weight: 600;
  text-decoration: none;
  color: var(--text);
}

.index-link:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.award-list li {
  display: flex;
  flex-direction: column;
  padding: 5px 0;
  line-height: 1.45;
  font-size: 0.9rem;
}

/* ---------- contact section ---------- */

/* A column: the content is centred in the space above the footer, which sits at
   the bottom edge and can grow without overlapping anything. */
.contact {
  flex-direction: column;
  padding-bottom: 24px;
}

.contact .project-content {
  justify-content: center;
  margin: auto 0;
}

.contact-main {
  max-width: 640px;
  align-items: center;
  text-align: center;
}

.contact-main .project-links {
  justify-content: center;
}

.site-footer {
  display: flex;
  width: 100%;
  padding-top: 32px;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  text-align: center;
  color: var(--text-muted);
}

.colophon {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  column-gap: 0.5em;
  font-size: 0.85rem;
}

.colophon span {
  white-space: nowrap;
}

.colophon span + span::before {
  content: "·";
  margin-right: 0.5em;
}

/* ---------- demo media ---------- */

.demo-field {
  display: block;
  text-decoration: none;
  transition: transform 0.3s ease;
}

.demo-field:hover {
  transform: scale(1.02);
}

.demo-container {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--demo-bg);
  box-shadow: var(--shadow);
}

.demo-slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 0.8s ease-in-out;
}

.demo-slide.active {
  opacity: 1;
}

.demo-media {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.demo-media.fit-contain {
  object-fit: contain;
}

/* blurred copy of a "contain" image filling the frame behind it */
.demo-backdrop {
  position: absolute;
  inset: -10%;
  width: 120%;
  height: 120%;
  object-fit: cover;
  filter: blur(24px) saturate(1.2);
  opacity: 0.85;
}

.demo-placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-muted);
}

/* ---------- dot navigation ---------- */

.progress-bar {
  position: fixed;
  right: 24px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 16px 10px;
  border-radius: 30px;
  background: var(--surface);
  box-shadow: var(--shadow-small);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: opacity 0.3s ease;
}

.progress-dot {
  position: relative;
  width: 12px;
  height: 12px;
  padding: 0;
  border: 0;
  border-radius: 6px;
  background: var(--dot);
  cursor: pointer;
  transition: height 0.3s ease, background 0.3s ease, transform 0.3s ease;
}

/* 24px touch target around the 12px dot */
.progress-dot::before {
  content: "";
  position: absolute;
  inset: -6px;
}

.progress-dot:hover {
  background: var(--dot-hover);
  transform: scale(1.2);
}

.progress-dot[aria-current="true"] {
  height: 32px;
  background: var(--dot-active);
  transform: none;
}

/* ---------- loading / error state ---------- */

.status {
  position: fixed;
  inset: 0;
  z-index: 900;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  text-align: center;
  font-size: 1.1rem;
  line-height: 1.6;
  color: var(--text-muted);
  background: var(--page-bg);
}

.status[hidden] {
  display: none;
}

/* ---------- 404 page ---------- */
/* One centred column that has to fit a single screen, so the big number, the
   image and the spacing between the blocks scale with the window height; the
   "Go home" button must never end up below the fold. */

.error-page {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 80px 20px 24px; /* the header sits in the top padding */
}

.error-container {
  width: 100%;
  max-width: 800px;
  text-align: center;
}

.error-code {
  font-size: min(clamp(5rem, 10vw, 8rem), 12vh);
  font-weight: 700;
  line-height: 1;
  margin-bottom: clamp(8px, 2vh, 20px);
  color: var(--text);
}

.error-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 12px;
}

.error-image-link {
  display: block;
  max-width: min(500px, 52vh);
  margin: clamp(12px, 3vh, 30px) auto;
  transition: transform 0.3s ease;
}

.error-image-link:hover {
  transform: scale(1.02);
}

.error-image {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  background: #fff; /* the image is transparent with black lettering */
  box-shadow: var(--shadow);
}

.error-title {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 700;
  margin-bottom: clamp(8px, 2vh, 16px);
  color: var(--text);
}

.error-message {
  font-size: 1.1rem;
  line-height: 1.6;
  margin-bottom: clamp(16px, 4vh, 36px);
  color: var(--text-muted);
}

/* ---------- small screens ---------- */

@media (max-width: 768px) {
  .site-header {
    padding: 14px 16px;
  }

  .project {
    padding: 56px 16px 20px;
  }

  .project-title {
    font-size: 1.6rem;
  }

  .intro-name {
    font-size: 2.1rem; /* the hero name stays larger than a project title */
  }

  /* always two lines on phones: name, then the rest, without a dangling separator */
  .colophon {
    flex-direction: column;
    row-gap: 2px;
  }

  .colophon span + span::before {
    content: none;
  }

  .contact {
    padding-bottom: 20px;
  }

  .project-content,
  .project:nth-child(even) .project-content {
    flex-direction: column;
    gap: 20px;
  }

  .text-field,
  .demo-field {
    flex: none;
    width: 100%;
  }

  .demo-field:hover {
    transform: none;
  }

  .text-field {
    gap: 10px;
  }

  .project-abstract {
    font-size: 0.95rem;
    line-height: 1.5;
  }

  .project-highlight {
    font-size: 0.95rem;
    line-height: 1.45;
  }

  /* every index row stacks title and meta, so the rows look alike, and the
     rows are compact so the card fits even a short phone screen */
  .index-list li {
    flex-direction: column;
    align-items: flex-start;
    line-height: 1.3;
  }

  .index-list .index-meta {
    text-align: left;
  }

  /* the dot navigation only shows while scrolling */
  .progress-bar {
    right: 10px;
    gap: 10px;
    padding: 12px 7px;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0s linear 0.3s;
  }

  .progress-bar.visible {
    opacity: 1;
    visibility: visible;
    transition: opacity 0.3s ease;
  }

  .progress-dot {
    width: 10px;
    height: 10px;
  }

  .progress-dot[aria-current="true"] {
    height: 26px;
  }
}

/* ---------- phones: abstracts collapse to their first sentence ---------- */
/* Only where a whole slide would not fit otherwise: narrow and not tall, so a
   tablet in portrait keeps the full text. */

@media (max-width: 768px) and (max-height: 900px) {
  .project-abstract.collapsible:not(.expanded) .abstract-rest {
    display: none;
  }

  .project-abstract.collapsible .abstract-toggle {
    display: inline;
  }
}

/* ---------- reduced motion ---------- */

@media (prefers-reduced-motion: reduce) {
  .demo-slide,
  .demo-field,
  .progress-dot,
  .progress-bar,
  .button,
  .site-name,
  .site-link,
  .error-image-link {
    transition: none;
  }

  .demo-field:hover,
  .error-image-link:hover,
  .button-primary:hover {
    transform: none;
  }
}

/* ---------- dark mode ---------- */
/* Last so it wins over the light rules above with equal specificity. The variable
   block is repeated because CSS cannot share one declaration block across a
   media-query boundary, and the media-query copy works without theme.js. The
   @supports guard keeps the light theme in browsers without color-mix(). */

/* the toggle forced light on a dark OS: native controls and overscroll follow */
:root[data-theme="light"] {
  color-scheme: light;
}

@supports (background: color-mix(in oklab, #fff 50%, #000)) {
  @media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
      color-scheme: dark;
      --text: #f2f2f2;
      --text-body: #d6d6d6;
      --text-muted: #a3a3a3;
      --page-bg: #141416;
      --demo-bg: #1c1c1e;
      --surface: rgba(28, 28, 30, 0.85);
      --on-text: #141416;
      --dot: #4a4a4a;
      --dot-hover: #8a8a8a;
      --dot-active: #f2f2f2;
      --focus: #60a5fa;
      --shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
      --shadow-small: 0 4px 20px rgba(0, 0, 0, 0.5);
      --chip: rgba(255, 255, 255, 0.1);
      --chip-border: rgba(255, 255, 255, 0.24);
    }

    :root:not([data-theme="light"]) .project {
      background: color-mix(in oklab, var(--project-bg) 14%, #141416);
    }
  }

  :root[data-theme="dark"] {
    color-scheme: dark;
    --text: #f2f2f2;
    --text-body: #d6d6d6;
    --text-muted: #a3a3a3;
    --page-bg: #141416;
    --demo-bg: #1c1c1e;
    --surface: rgba(28, 28, 30, 0.85);
    --on-text: #141416;
    --dot: #4a4a4a;
    --dot-hover: #8a8a8a;
    --dot-active: #f2f2f2;
    --focus: #60a5fa;
    --shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
    --shadow-small: 0 4px 20px rgba(0, 0, 0, 0.5);
    --chip: rgba(255, 255, 255, 0.1);
    --chip-border: rgba(255, 255, 255, 0.24);
  }

  :root[data-theme="dark"] .project {
    background: color-mix(in oklab, var(--project-bg) 14%, #141416);
  }
}