/* ═══════════════════════════════════════════════════════════════
   /timeTravel: four era themes

   Loaded only by timeTravel.html, after styles.css (which supplies the
   :root tokens and reset). Kept out of styles.css deliberately: four
   design systems is a lot of CSS to ship to every other page on the
   site for no reason.

   Everything is scoped to body.timetravel-page. Era selection is a
   single attribute on the body, so switching frames swaps the entire
   visual language in one paint.
   ═══════════════════════════════════════════════════════════════ */

/* ─────────── Shell ─────────── */

body.timetravel-page {
  margin: 0;
  min-height: 100svh;
  transition: background-color 0.45s ease, color 0.45s ease;
}

body.timetravel-page .tt-era {
  display: none;
}

body.timetravel-page[data-era="1998"] .tt-era[data-frame="1998"],
body.timetravel-page[data-era="2012"] .tt-era[data-frame="2012"],
body.timetravel-page[data-era="2024"] .tt-era[data-frame="2024"],
body.timetravel-page[data-era="2035"] .tt-era[data-frame="2035"] {
  display: block;
}

body.timetravel-page main {
  max-width: 54rem;
  margin: 0 auto;
  padding: clamp(1.5rem, 4vw, 3rem) clamp(1rem, 4vw, 2rem) 4rem;
}

/* Top bar and year tabs: restyled per era below. */
body.timetravel-page .tt-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  max-width: 54rem;
  margin: 0 auto;
  padding: 1rem clamp(1rem, 4vw, 2rem);
}

body.timetravel-page .tt-bar__id,
body.timetravel-page .tt-bar__exit {
  margin: 0;
  font-size: 0.8125rem;
}

body.timetravel-page .tt-tabs {
  display: flex;
  gap: 0.25rem;
}

body.timetravel-page .tt-tab {
  font: inherit;
  font-size: 0.8125rem;
  padding: 0.4rem 0.75rem;
  min-height: 36px;
  border: 1px solid transparent;
  background: transparent;
  color: inherit;
  cursor: pointer;
  opacity: 0.55;
  transition: opacity 0.2s ease, background-color 0.2s ease,
    border-color 0.2s ease, color 0.2s ease;
}

body.timetravel-page .tt-tab:hover {
  opacity: 0.85;
}

body.timetravel-page .tt-tab[aria-selected="true"] {
  opacity: 1;
}

/* Shared structural elements, colour supplied per era. */
/* styles.css sets a serif face on h1 globally. Each era supplies its own
   typeface on the body, so inherit rather than restating it four times. */
body.timetravel-page .tt-h {
  margin: 0 0 0.5rem;
  line-height: 1.2;
  font-family: inherit;
}

body.timetravel-page .tt-sub,
body.timetravel-page .tt-eyebrow {
  margin: 0 0 2rem;
  font-size: 0.8125rem;
  opacity: 0.7;
}

body.timetravel-page .tt-label {
  margin: 3rem 0 1rem;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  opacity: 0.6;
}

/* Timeline: same markup in all four frames, restyled per era. */
body.timetravel-page .tt-tl {
  list-style: none;
  margin: 0;
  padding: 0;
}

body.timetravel-page .tt-tl__item {
  display: grid;
  grid-template-columns: 8.5rem 12rem 1fr;
  gap: 0.75rem;
  padding: 0.85rem 0;
  align-items: baseline;
}

body.timetravel-page .tt-tl__yr {
  font-size: 0.8125rem;
  opacity: 0.65;
}

body.timetravel-page .tt-tl__wh {
  font-weight: 600;
  font-size: 0.875rem;
}

body.timetravel-page .tt-tl__wt {
  font-size: 0.875rem;
  opacity: 0.8;
  line-height: 1.6;
}

@media (max-width: 700px) {
  body.timetravel-page .tt-tl__item {
    grid-template-columns: 1fr;
    gap: 0.2rem;
  }
}

body.timetravel-page .tt-foot {
  max-width: 54rem;
  margin: 0 auto;
  padding: 2rem clamp(1rem, 4vw, 2rem) 3rem;
  font-size: 0.75rem;
  opacity: 0.6;
}

body.timetravel-page .tt-foot p {
  margin: 0 0 0.4rem;
}

body.timetravel-page .tt-foot__note {
  font-style: italic;
  opacity: 0.8;
}

/* ═══════════════ 1998: CRT terminal ═══════════════ */

body.timetravel-page[data-era="1998"] {
  background: #050705;
  color: #33ff6a;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.7;
}

body.timetravel-page[data-era="1998"] a {
  color: #7dffa8;
  text-underline-offset: 3px;
}

body.timetravel-page[data-era="1998"] .tt-bar {
  border-bottom: 1px solid rgba(51, 255, 106, 0.3);
}

body.timetravel-page[data-era="1998"] .tt-tab {
  border-color: rgba(51, 255, 106, 0.35);
  border-radius: 0;
}

body.timetravel-page[data-era="1998"] .tt-tab[aria-selected="true"] {
  background: #33ff6a;
  color: #050705;
}

/* Scanlines. Purely decorative, and removed for reduced motion. */
body.timetravel-page[data-era="1998"] .tt-crt {
  position: relative;
}

body.timetravel-page[data-era="1998"] .tt-crt::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(
    to bottom,
    rgba(0, 0, 0, 0) 0px,
    rgba(0, 0, 0, 0) 2px,
    rgba(0, 0, 0, 0.22) 3px,
    rgba(0, 0, 0, 0.22) 4px
  );
  z-index: 2;
}

body.timetravel-page[data-era="1998"] .tt-boot {
  margin: 0 0 2rem;
  font-size: 0.8125rem;
  line-height: 1.9;
  opacity: 0.75;
}

body.timetravel-page[data-era="1998"] .tt-boot--end {
  margin: 3rem 0 0;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(51, 255, 106, 0.25);
}

body.timetravel-page[data-era="1998"] .tt-warn {
  color: #ffd166;
}

body.timetravel-page[data-era="1998"] .tt-h {
  font-size: clamp(1.1rem, 0.7rem + 1.6vw, 1.5rem);
  font-weight: 600;
  letter-spacing: 0.02em;
}

body.timetravel-page[data-era="1998"] .tt-cursor {
  animation: tt-blink 1.1s steps(1) infinite;
}

@keyframes tt-blink {
  50% { opacity: 0; }
}

body.timetravel-page[data-era="1998"] .tt-ascii {
  margin: 1.5rem 0 2rem;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  line-height: 1.5;
  color: #33ff6a;
  overflow-x: auto;
  white-space: pre;
}

body.timetravel-page[data-era="1998"] .tt-p {
  max-width: 40rem;
  opacity: 0.9;
}

body.timetravel-page[data-era="1998"] .tt-tl__item {
  border-bottom: 1px dashed rgba(51, 255, 106, 0.22);
}

body.timetravel-page[data-era="1998"] .tt-tl__wh {
  color: #7dffa8;
}

body.timetravel-page[data-era="1998"] .tt-foot {
  border-top: 1px solid rgba(51, 255, 106, 0.25);
}

/* ═══════════════ 2012: skeuomorphic iOS 6 ═══════════════ */

body.timetravel-page[data-era="2012"] {
  /* Woven "linen" ground, built from gradients so there is no image to load. */
  background-color: #d8d3ca;
  background-image:
    repeating-linear-gradient(45deg, rgba(255, 255, 255, 0.35) 0 1px, rgba(0, 0, 0, 0) 1px 3px),
    repeating-linear-gradient(-45deg, rgba(0, 0, 0, 0.05) 0 1px, rgba(0, 0, 0, 0) 1px 3px);
  color: #2f2f31;
  font-family: "Helvetica Neue", Helvetica, "Lucida Grande", Arial, sans-serif;
  font-size: 0.9375rem;
  line-height: 1.6;
}

body.timetravel-page[data-era="2012"] a {
  color: #0a60c2;
}

body.timetravel-page[data-era="2012"] .tt-bar {
  background: linear-gradient(to bottom, #fdfdfd 0%, #d3d5da 100%);
  border-bottom: 1px solid #93959b;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.25);
  max-width: none;
  padding-inline: clamp(1rem, 4vw, 2rem);
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.85);
}

body.timetravel-page[data-era="2012"] .tt-tab {
  border-color: #9a9ca2;
  border-radius: 5px;
  background: linear-gradient(to bottom, #fefefe 0%, #dcdee3 100%);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.9), 0 1px 1px rgba(0, 0, 0, 0.14);
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.8);
  font-weight: 500;
}

body.timetravel-page[data-era="2012"] .tt-tab[aria-selected="true"] {
  background: linear-gradient(to bottom, #5b9ae4 0%, #2f6fc4 100%);
  border-color: #24589e;
  color: #fff;
  text-shadow: 0 -1px 0 rgba(0, 0, 0, 0.35);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.4), 0 1px 1px rgba(0, 0, 0, 0.2);
}

body.timetravel-page[data-era="2012"] .tt-nav2012 {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.75rem;
  padding: 0.6rem 0.85rem;
  border: 1px solid #24589e;
  border-radius: 6px;
  background: linear-gradient(to bottom, #6ba4e8 0%, #2f6fc4 100%);
  color: #fff;
  font-size: 0.8125rem;
  font-weight: 500;
  text-shadow: 0 -1px 0 rgba(0, 0, 0, 0.35);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.35);
}

body.timetravel-page[data-era="2012"] .tt-nav2012__title {
  font-size: 1rem;
  font-weight: 700;
}

body.timetravel-page[data-era="2012"] .tt-h {
  font-size: clamp(1.4rem, 0.9rem + 2vw, 2rem);
  font-weight: 700;
  color: #1d1d1f;
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.75);
}

body.timetravel-page[data-era="2012"] .tt-sub {
  color: #5c5c60;
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.7);
}

body.timetravel-page[data-era="2012"] .tt-card {
  margin-bottom: 1.5rem;
  border: 1px solid #b3b0a8;
  border-radius: 10px;
  background: #fbfaf7;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.22), inset 0 1px 0 rgba(255, 255, 255, 0.9);
  overflow: hidden;
}

body.timetravel-page[data-era="2012"] .tt-card__head {
  padding: 0.7rem 1rem;
  border-bottom: 1px solid #b8b5ad;
  background: linear-gradient(to bottom, #f6f5f2 0%, #e2e0d9 100%);
  font-weight: 700;
  font-size: 0.875rem;
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.9);
}

body.timetravel-page[data-era="2012"] .tt-card__body {
  padding: 1rem;
}

body.timetravel-page[data-era="2012"] .tt-card__body p {
  margin: 0 0 0.85rem;
}

body.timetravel-page[data-era="2012"] .tt-card__body p:last-child {
  margin-bottom: 0;
}

body.timetravel-page[data-era="2012"] .tt-grid2012 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(9rem, 1fr));
  gap: 0.75rem;
}

body.timetravel-page[data-era="2012"] .tt-tile {
  padding: 1rem;
  border: 1px solid #b3b0a8;
  border-radius: 10px;
  background: linear-gradient(to bottom, #ffffff 0%, #eeece6 100%);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.18), inset 0 1px 0 rgba(255, 255, 255, 0.95);
  text-align: center;
}

body.timetravel-page[data-era="2012"] .tt-tile__n {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 700;
  color: #2f6fc4;
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.9);
}

body.timetravel-page[data-era="2012"] .tt-tile__l {
  margin: 0.25rem 0 0;
  font-size: 0.75rem;
  color: #5c5c60;
}

body.timetravel-page[data-era="2012"] .tt-label {
  color: #4a4a4e;
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.8);
  opacity: 1;
}

body.timetravel-page[data-era="2012"] .tt-tl {
  border: 1px solid #b3b0a8;
  border-radius: 10px;
  background: #fbfaf7;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.18);
  overflow: hidden;
}

body.timetravel-page[data-era="2012"] .tt-tl__item {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid #e0ded7;
}

body.timetravel-page[data-era="2012"] .tt-tl__item:last-child {
  border-bottom: none;
}

body.timetravel-page[data-era="2012"] .tt-tl__item--now {
  background: #fdf6dd;
}

body.timetravel-page[data-era="2012"] .tt-tl__wh {
  color: #1d1d1f;
}

body.timetravel-page[data-era="2012"] .tt-note2012 {
  margin-top: 2rem;
  font-size: 0.8125rem;
  font-style: italic;
  color: #5c5c60;
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.7);
}

body.timetravel-page[data-era="2012"] .tt-foot {
  color: #4a4a4e;
  opacity: 0.85;
  border-top: 1px solid #b8b5ad;
}

/* ═══════════════ 2024: glassmorphic dark dashboard ═══════════════ */

body.timetravel-page[data-era="2024"] {
  background-color: #0a0d12;
  background-image:
    radial-gradient(ellipse 70% 50% at 15% 0%, rgba(72, 128, 255, 0.18), transparent),
    radial-gradient(ellipse 60% 45% at 90% 10%, rgba(160, 92, 255, 0.15), transparent);
  background-attachment: fixed;
  color: #e8ecf3;
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  line-height: 1.65;
}

body.timetravel-page[data-era="2024"] a {
  color: #8ab4ff;
}

body.timetravel-page[data-era="2024"] .tt-bar {
  border-bottom: 1px solid rgba(232, 236, 243, 0.1);
}

body.timetravel-page[data-era="2024"] .tt-tab {
  border-radius: 999px;
  border-color: rgba(232, 236, 243, 0.16);
}

body.timetravel-page[data-era="2024"] .tt-tab[aria-selected="true"] {
  background: rgba(138, 180, 255, 0.16);
  border-color: rgba(138, 180, 255, 0.5);
  color: #cfe0ff;
}

body.timetravel-page[data-era="2024"] .tt-eyebrow {
  margin-bottom: 0.5rem;
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: #8ab4ff;
  opacity: 1;
}

body.timetravel-page[data-era="2024"] .tt-h {
  font-size: clamp(1.6rem, 1rem + 2.6vw, 2.5rem);
  font-weight: 600;
  letter-spacing: -0.02em;
}

body.timetravel-page[data-era="2024"] .tt-glassgrid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(11rem, 1fr));
  gap: 0.85rem;
  margin-bottom: 0.85rem;
}

body.timetravel-page[data-era="2024"] .tt-glass {
  padding: 1.25rem;
  border: 1px solid rgba(232, 236, 243, 0.12);
  border-radius: 16px;
  background: rgba(232, 236, 243, 0.05);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

body.timetravel-page[data-era="2024"] .tt-glass--wide p {
  margin: 0 0 0.85rem;
  color: rgba(232, 236, 243, 0.82);
}

body.timetravel-page[data-era="2024"] .tt-glass--wide p:last-child {
  margin-bottom: 0;
}

body.timetravel-page[data-era="2024"] .tt-glass__n {
  margin: 0;
  font-size: 1.85rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  background: linear-gradient(120deg, #8ab4ff, #c39cff);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

body.timetravel-page[data-era="2024"] .tt-glass__l {
  margin: 0.35rem 0 0;
  font-size: 0.8125rem;
  color: rgba(232, 236, 243, 0.65);
  line-height: 1.45;
}

body.timetravel-page[data-era="2024"] .tt-tl__item {
  border-bottom: 1px solid rgba(232, 236, 243, 0.08);
}

body.timetravel-page[data-era="2024"] .tt-tl__item--now {
  border-left: 2px solid #8ab4ff;
  padding-left: 0.85rem;
}

body.timetravel-page[data-era="2024"] .tt-tl__wh {
  color: #cfe0ff;
}

body.timetravel-page[data-era="2024"] .tt-foot {
  border-top: 1px solid rgba(232, 236, 243, 0.1);
}

/* ═══════════════ 2035: archival retrospective ═══════════════ */

body.timetravel-page[data-era="2035"] {
  background: #f2f1ee;
  color: #16161a;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 300;
  line-height: 1.85;
}

body.timetravel-page[data-era="2035"] a {
  color: #16161a;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
}

body.timetravel-page[data-era="2035"] .tt-bar {
  border-bottom: 1px solid rgba(22, 22, 26, 0.14);
}

body.timetravel-page[data-era="2035"] .tt-bar__id,
body.timetravel-page[data-era="2035"] .tt-bar__exit {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

body.timetravel-page[data-era="2035"] .tt-tab {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  border-radius: 0;
  border-bottom-color: transparent;
}

body.timetravel-page[data-era="2035"] .tt-tab[aria-selected="true"] {
  border-bottom-color: #16161a;
}

body.timetravel-page[data-era="2035"] .tt-eyebrow {
  margin-bottom: 2.5rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  opacity: 0.5;
}

body.timetravel-page[data-era="2035"] .tt-h {
  font-size: clamp(2rem, 1rem + 4vw, 3.25rem);
  font-weight: 200;
  letter-spacing: -0.03em;
  margin-bottom: 2.5rem;
}

body.timetravel-page[data-era="2035"] .tt-lede2035 {
  max-width: 34rem;
  margin: 0 0 4rem;
  font-size: 1.125rem;
  font-weight: 300;
  line-height: 1.7;
  opacity: 0.75;
}

body.timetravel-page[data-era="2035"] .tt-entry {
  max-width: 36rem;
  margin: 0 0 3.5rem;
}

body.timetravel-page[data-era="2035"] .tt-entry__k {
  margin: 0 0 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  opacity: 0.45;
}

body.timetravel-page[data-era="2035"] .tt-entry p:not(.tt-entry__k) {
  margin: 0;
}

body.timetravel-page[data-era="2035"] .tt-label {
  font-family: var(--font-mono);
  margin-top: 5rem;
  opacity: 0.45;
}

body.timetravel-page[data-era="2035"] .tt-tl__item {
  border-top: 1px solid rgba(22, 22, 26, 0.14);
  padding: 1.5rem 0;
}

body.timetravel-page[data-era="2035"] .tt-tl__yr {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  opacity: 0.5;
}

body.timetravel-page[data-era="2035"] .tt-tl__wh {
  font-weight: 400;
  font-size: 1rem;
}

body.timetravel-page[data-era="2035"] .tt-tl__item--now .tt-tl__wh {
  font-style: italic;
}

body.timetravel-page[data-era="2035"] .tt-close2035 {
  max-width: 34rem;
  margin: 5rem 0 0;
  padding-top: 2rem;
  border-top: 1px solid rgba(22, 22, 26, 0.14);
  font-size: 0.875rem;
  opacity: 0.6;
}

body.timetravel-page[data-era="2035"] .tt-foot {
  border-top: 1px solid rgba(22, 22, 26, 0.14);
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
}

/* ─────────── Motion ─────────── */

@media (prefers-reduced-motion: reduce) {
  body.timetravel-page,
  body.timetravel-page .tt-tab {
    transition: none;
  }

  body.timetravel-page[data-era="1998"] .tt-cursor {
    animation: none;
  }

  body.timetravel-page[data-era="1998"] .tt-crt::after {
    display: none;
  }
}