:root {
    --bg: #05060e;
    --ink: #e9e7f2;
    --muted: #9b98b0;
    --faint: #8f8ca8;
    --card: rgba(19, 21, 38, 0.78);
    --edge: rgba(255, 255, 255, 0.09);
    --you: #ff2e63;
    --c-machines: #ff4d6d;
    --c-alien: #70e000;
    --c-nuclear: #ff9e00;
    --c-eco: #2ec4b6;
    --c-bio: #c77dff;
    --c-cosmic: #4cc9f0;
    --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
    --sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    --hud-h: 52px;
  }
  * { box-sizing: border-box; }
  html { scroll-behavior: smooth; }
  body {
    margin: 0;
    background: var(--bg);
    color: var(--ink);
    font-family: var(--sans);
    line-height: 1.55;
    overflow-x: hidden;
  }
  a { color: var(--c-cosmic); }

  /* ---------- sky ---------- */
  .sky, .era {
    position: fixed;
    inset: -12vh -12vw;
    pointer-events: none;
    z-index: 0;
  }
  .era { transition: opacity 0.4s linear; }
  .era-future {
    background:
      radial-gradient(60vmax 44vmax at 82% -8%, rgba(124, 92, 255, 0.32), transparent 65%),
      radial-gradient(48vmax 36vmax at 8% 32%, rgba(76, 201, 240, 0.16), transparent 60%);
  }
  .era-present {
    background:
      radial-gradient(56vmax 40vmax at 78% 4%, rgba(46, 128, 240, 0.20), transparent 62%),
      radial-gradient(44vmax 34vmax at 12% 62%, rgba(46, 196, 182, 0.10), transparent 60%);
  }
  .era-past {
    background:
      radial-gradient(56vmax 42vmax at 76% 10%, rgba(255, 158, 0, 0.16), transparent 62%),
      radial-gradient(46vmax 36vmax at 14% 66%, rgba(217, 119, 66, 0.11), transparent 60%);
  }
  .stars { opacity: 0.9; }
  .stars .s1, .stars .s2 {
    position: absolute;
    inset: 0;
    background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="420" height="420"><g fill="white"><circle cx="22" cy="34" r="1.1"/><circle cx="98" cy="12" r="0.7"/><circle cx="151" cy="76" r="1.3"/><circle cx="211" cy="29" r="0.8"/><circle cx="284" cy="63" r="1.0"/><circle cx="356" cy="20" r="0.7"/><circle cx="398" cy="112" r="1.2"/><circle cx="47" cy="128" r="0.8"/><circle cx="120" cy="169" r="1.0"/><circle cx="196" cy="141" r="0.6"/><circle cx="262" cy="188" r="1.2"/><circle cx="330" cy="150" r="0.8"/><circle cx="16" cy="222" r="1.0"/><circle cx="88" cy="257" r="0.7"/><circle cx="171" cy="234" r="1.1"/><circle cx="243" cy="279" r="0.7"/><circle cx="317" cy="243" r="1.3"/><circle cx="387" cy="292" r="0.8"/><circle cx="58" cy="334" r="1.1"/><circle cx="132" cy="368" r="0.7"/><circle cx="209" cy="331" r="1.0"/><circle cx="281" cy="382" r="0.9"/><circle cx="349" cy="342" r="0.7"/><circle cx="401" cy="399" r="1.1"/></g></svg>');
  }
  .stars .s1 { animation: twinkle 7s ease-in-out infinite alternate; }
  .stars .s2 {
    background-size: 640px 640px;
    opacity: 0.5;
    animation: twinkle 9s 2s ease-in-out infinite alternate-reverse;
  }
  @keyframes twinkle { from { opacity: 0.35; } to { opacity: 0.85; } }

  /* ---------- HUD ---------- */
  .hud {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: var(--hud-h);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 0 clamp(12px, 3vw, 28px);
    background: rgba(7, 8, 18, 0.72);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--edge);
    z-index: 10;
    font-family: var(--mono);
  }
  .hud .brand {
    font-size: 11px;
    letter-spacing: 0.22em;
    color: var(--muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }
  .hud .brand strong { color: var(--ink); }
  .odo { text-align: right; white-space: nowrap; }
  .odo small {
    display: block;
    font-size: 9px;
    letter-spacing: 0.3em;
    color: var(--faint);
  }
  .odo span {
    font-size: 17px;
    font-weight: 700;
    color: var(--ink);
    text-shadow: 0 0 14px rgba(76, 201, 240, 0.55);
    font-variant-numeric: tabular-nums;
  }
  .progress {
    position: absolute;
    left: 0; bottom: -2px;
    height: 2px;
    width: 100%;
    transform: scaleX(0);
    transform-origin: 0 50%;
    background: linear-gradient(90deg, #8b7cf8, #4cc9f0, #ff9e00);
  }

  /* ---------- hero ---------- */
  .hero {
    position: relative;
    z-index: 1;
    min-height: 100svh;
    display: grid;
    place-content: center;
    text-align: center;
    padding: calc(var(--hud-h) + 24px) 20px 48px;
  }
  .hero .over {
    font-family: var(--mono);
    font-size: 12px;
    letter-spacing: 0.42em;
    color: var(--muted);
  }
  .hero h1 {
    margin: 10px 0 14px;
    font-size: clamp(2.5rem, 9vw, 5.6rem);
    line-height: 0.98;
    letter-spacing: -0.02em;
    text-transform: uppercase;
    background: linear-gradient(100deg, #a78bfa 5%, #4cc9f0 45%, #ffb454 95%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
  }
  .hero p.sub {
    max-width: 34em;
    margin: 0 auto;
    color: var(--muted);
  }
  .legend {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px 14px;
    margin: 26px auto 0;
    padding: 0;
    list-style: none;
    font-family: var(--mono);
    font-size: 10.5px;
    letter-spacing: 0.12em;
    color: var(--muted);
  }
  .legend i {
    display: inline-block;
    width: 9px; height: 9px;
    border-radius: 50%;
    margin-right: 6px;
    background: var(--dot);
    box-shadow: 0 0 8px var(--dot);
  }
  .hero .cue {
    margin-top: 40px;
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 0.28em;
    color: var(--faint);
  }
  .hero .cue span {
    display: block;
    font-size: 18px;
    margin-top: 6px;
    animation: bob 1.6s ease-in-out infinite;
  }
  @keyframes bob { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(8px); } }

  /* ---------- timeline ---------- */
  .rail {
    position: relative;
    z-index: 1;
    max-width: 1160px;
    margin: 0 auto;
    padding: 30px 16px 10px;
  }
  .rail::before {
    content: "";
    position: absolute;
    top: 0; bottom: 0;
    left: 50%;
    width: 2px;
    transform: translateX(-50%);
    background: linear-gradient(180deg,
      #b97a3f 0%, #ff9e00 38%, #ff2e63 54%, #4cc9f0 66%, #8b7cf8 100%);
    opacity: 0.55;
    -webkit-mask-image: linear-gradient(180deg, transparent, black 3%, black 97%, transparent);
    mask-image: linear-gradient(180deg, transparent, black 3%, black 97%, transparent);
  }
  .entry {
    position: relative;
    display: grid;
    grid-template-columns: minmax(0, 1fr) 72px minmax(0, 1fr);
    align-items: start;
    margin: 26px 0;
  }
  .node {
    grid-column: 2;
    grid-row: 1;
    justify-self: center;
    width: 46px; height: 46px;
    border-radius: 50%;
    display: grid;
    place-items: center;
    color: var(--cat);
    background: #0a0c1c;
    border: 2px solid var(--cat);
    box-shadow: 0 0 0 rgba(0, 0, 0, 0);
    transition: box-shadow 0.6s ease, transform 0.6s ease, opacity 0.6s ease;
    transform: scale(0.6);
    opacity: 0.35;
  }
  .in-view .node {
    transform: scale(1);
    opacity: 1;
    box-shadow: 0 0 22px color-mix(in srgb, var(--cat) 55%, transparent);
  }
  .node svg { width: 26px; height: 26px; }

  .card {
    grid-row: 1;
    max-width: 500px;
    width: 100%;
    background: var(--card);
    border: 1px solid var(--edge);
    border-radius: 16px;
    padding: 16px 16px 12px;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    cursor: pointer;
    transition: transform 0.35s ease, border-color 0.35s ease, box-shadow 0.35s ease,
                opacity 0.7s ease;
  }
  .side-l .card { grid-column: 1; justify-self: end; }
  .side-r .card { grid-column: 3; justify-self: start; }
  @media (hover: hover) {
    .card:hover {
      transform: translateY(-4px);
      border-color: color-mix(in srgb, var(--cat) 55%, var(--edge));
      box-shadow: 0 14px 34px rgba(0, 0, 0, 0.45),
                  0 0 24px color-mix(in srgb, var(--cat) 18%, transparent);
    }
  }
  .reveal .card { opacity: 0; transform: translateY(26px); }
  .in-view .card { opacity: 1; transform: none; }

  .card-head {
    display: grid;
    grid-template-columns: 92px minmax(0, 1fr);
    gap: 14px;
  }
  .poster {
    position: relative;
    width: 92px; height: 138px;
    border-radius: 9px;
    overflow: hidden;
    background: #0a0c1c;
    border: 1px solid var(--edge);
    flex: none;
  }
  .poster img {
    width: 100%; height: 100%;
    object-fit: cover;
    display: block;
  }
  .poster.fit-contain img { object-fit: contain; padding: 6px; }
  .poster .art {
    position: absolute;
    inset: 0;
    display: none;
    place-items: center;
    color: var(--cat);
    background:
      radial-gradient(120% 90% at 50% 0%, color-mix(in srgb, var(--cat) 26%, transparent), transparent 70%),
      #0a0c1c;
  }
  .poster .art svg { width: 44px; height: 44px; opacity: 0.9; }
  .poster.noimg img { display: none; }
  .poster.noimg .art { display: grid; }

  .when {
    font-family: var(--mono);
    font-size: clamp(15px, 2.1vw, 18px);
    font-weight: 700;
    color: var(--cat);
    letter-spacing: 0.02em;
  }
  .dist {
    font-family: var(--mono);
    font-size: 10px;
    letter-spacing: 0.18em;
    color: var(--faint);
    text-transform: uppercase;
    margin-top: 2px;
  }
  .card h2 {
    margin: 6px 0 8px;
    font-size: 1.16rem;
    line-height: 1.25;
  }
  .chips {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 8px;
  }
  .chip {
    font-family: var(--mono);
    font-size: 9.5px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--muted);
    border: 1px solid var(--edge);
    border-radius: 999px;
    padding: 3px 9px;
    white-space: nowrap;
    max-width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
  }
  .chip.cat {
    color: var(--cat);
    border-color: color-mix(in srgb, var(--cat) 45%, transparent);
    background: color-mix(in srgb, var(--cat) 12%, transparent);
  }
  .hook {
    margin: 0;
    font-style: italic;
    color: var(--muted);
    font-size: 0.92rem;
  }

  .toggle {
    display: flex;
    align-items: center;
    gap: 7px;
    margin: 10px 0 0;
    padding: 6px 2px;
    background: none;
    border: 0;
    color: var(--faint);
    font-family: var(--mono);
    font-size: 10px;
    letter-spacing: 0.24em;
    text-transform: uppercase;
    cursor: pointer;
  }
  .toggle::after {
    content: "";
    width: 7px; height: 7px;
    border-right: 1.5px solid currentColor;
    border-bottom: 1.5px solid currentColor;
    transform: rotate(45deg) translateY(-2px);
    transition: transform 0.3s ease;
  }
  .open .toggle { color: var(--cat); }
  .open .toggle::after { transform: rotate(-135deg) translateY(-2px); }

  .details {
    display: grid;
    grid-template-rows: 0fr;
    transition: grid-template-rows 0.45s ease;
  }
  .open .details { grid-template-rows: 1fr; }
  /* visibility keeps collapsed content out of the tab order and a11y tree;
     the delay lets the close animation finish before it vanishes */
  .details > div { overflow: hidden; min-height: 0; visibility: hidden; transition: visibility 0s 0.45s; }
  .open .details > div { visibility: visible; transition: visibility 0s; }
  .details p { margin: 10px 0 0; font-size: 0.94rem; color: var(--ink); }
  .details .basis {
    margin-top: 10px;
    padding: 8px 12px;
    border-left: 2px solid var(--cat);
    background: rgba(255, 255, 255, 0.035);
    border-radius: 0 8px 8px 0;
    font-size: 0.85rem;
    color: var(--muted);
  }
  .details .basis b {
    display: block;
    font-family: var(--mono);
    font-size: 9px;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--faint);
    margin-bottom: 3px;
  }
  .details .meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px;
    margin: 12px 0 4px;
    font-size: 0.85rem;
    color: var(--muted);
  }
  .wiki {
    font-family: var(--mono);
    font-size: 10.5px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    text-decoration: none;
    color: var(--cat);
    border: 1px solid color-mix(in srgb, var(--cat) 50%, transparent);
    border-radius: 999px;
    padding: 5px 12px;
  }
  @media (hover: hover) {
    .wiki:hover { background: color-mix(in srgb, var(--cat) 14%, transparent); }
  }

  /* gap + now markers */
  .gap {
    position: relative;
    display: grid;
    place-items: center;
    padding: 44px 0;
    z-index: 1;
  }
  .gap span {
    font-family: var(--mono);
    font-size: 10.5px;
    letter-spacing: 0.34em;
    text-transform: uppercase;
    color: var(--faint);
    background: var(--bg);
    border: 1px dashed rgba(255, 255, 255, 0.16);
    border-radius: 999px;
    padding: 7px 16px 7px 18px;
  }
  .now {
    position: relative;
    display: grid;
    place-items: center;
    text-align: center;
    padding: 54px 16px;
    z-index: 1;
  }
  .beacon {
    position: relative;
    width: 20px; height: 20px;
    border-radius: 50%;
    background: var(--you);
    box-shadow: 0 0 18px var(--you);
    margin-bottom: 18px;
  }
  .beacon .r1, .beacon .r2 {
    position: absolute;
    inset: 0;
    border-radius: 50%;
    border: 2px solid var(--you);
    animation: ping 2.6s cubic-bezier(0, 0, 0.2, 1) infinite;
  }
  .beacon .r2 { animation-delay: 1.3s; }
  @keyframes ping {
    0% { transform: scale(1); opacity: 0.9; }
    80%, 100% { transform: scale(3.4); opacity: 0; }
  }
  .now h2 {
    margin: 0;
    font-family: var(--mono);
    font-size: clamp(1.2rem, 4.5vw, 1.7rem);
    letter-spacing: 0.42em;
    text-indent: 0.42em;
    color: var(--you);
    text-shadow: 0 0 22px rgba(255, 46, 99, 0.6);
  }
  .now .stamp {
    margin-top: 8px;
    font-family: var(--mono);
    font-size: 12.5px;
    color: var(--ink);
    letter-spacing: 0.08em;
  }
  .now .quip {
    margin-top: 8px;
    max-width: 30em;
    font-size: 0.9rem;
    color: var(--muted);
    font-style: italic;
  }

  /* footer */
  footer {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 56px 20px 90px;
    color: var(--muted);
    font-size: 0.92rem;
  }
  footer .end {
    font-family: var(--mono);
    letter-spacing: 0.34em;
    font-size: 11px;
    color: var(--faint);
    margin-bottom: 14px;
  }
  footer .fine { font-size: 0.78rem; color: var(--faint); max-width: 46em; margin: 14px auto 0; }

  .now-btn {
    position: fixed;
    right: 18px; bottom: 18px;
    z-index: 10;
    width: 58px; height: 58px;
    border-radius: 50%;
    border: 1px solid color-mix(in srgb, var(--you) 55%, transparent);
    background: rgba(12, 8, 16, 0.8);
    color: var(--you);
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 0.14em;
    cursor: pointer;
    box-shadow: 0 0 18px rgba(255, 46, 99, 0.35);
    transition: opacity 0.35s ease, transform 0.35s ease, visibility 0.35s;
  }
  .now-btn.hide { opacity: 0; transform: scale(0.7); pointer-events: none; visibility: hidden; }

  /* ---------- mobile ---------- */
  @media (max-width: 759px) {
    .entry { grid-template-columns: 62px minmax(0, 1fr); margin: 20px 0; }
    .rail::before { left: 47px; transform: translateX(-50%); } /* 16px rail padding + 31px node-column center */
    .node { grid-column: 1; width: 40px; height: 40px; }
    .node svg { width: 22px; height: 22px; }
    .side-l .card, .side-r .card { grid-column: 2; justify-self: stretch; max-width: none; }
    .card-head { grid-template-columns: 74px minmax(0, 1fr); gap: 12px; }
    .poster { width: 74px; height: 111px; }
    .gap span { letter-spacing: 0.2em; font-size: 9.5px; }
    .now { justify-items: start; text-align: left; padding-left: 62px; }
    .now h2 { letter-spacing: 0.24em; text-indent: 0; }
    .beacon { position: absolute; left: 21px; top: 50%; margin: 0; transform: translateY(-50%); }
  }

  @media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after { animation: none !important; transition: none !important; }
    .reveal, .reveal .card, .node { opacity: 1; transform: none; }
  }