:root {
    /* Field: cold, deep, achromatic — the water */
    --abyss: #06070a;
    --deep: #0b0d11;
    --card: #101318;
    --foam: #eef1f4;
    --mist: #99a2ac;
    --mute: #6a737d;
    /* Signal: cold water — the one deliberate mark in the chaos */
    --signal: #6f9fc0;
    --signal-2: #9cc4dd;
    --line: rgba(255, 255, 255, 0.08);
    --line-strong: rgba(255, 255, 255, 0.14);
    --display: "Archivo", sans-serif;
    --mono: "Space Mono", ui-monospace, monospace;
    --body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  }

  * { box-sizing: border-box; }
  html { scroll-behavior: smooth; }
  body {
    margin: 0;
    background: var(--abyss);
    color: var(--foam);
    font-family: var(--body);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
  }
  a { color: inherit; }
  p { margin: 0; }
  h1, h2, h3 {
    margin: 0;
    font-family: var(--display);
    line-height: 1.04;
    letter-spacing: -0.02em;
  }

  .wrap { width: min(1080px, calc(100% - 44px)); margin: 0 auto; }
  @media (max-width: 640px) { .wrap { width: calc(100% - 32px); } }

  /* Nav */
  nav {
    position: fixed;
    inset: 0 0 auto;
    z-index: 50;
    padding: 20px 0;
    border-bottom: 1px solid transparent;
    transition: background .3s ease, border-color .3s ease;
  }
  nav.scrolled {
    background: rgba(8, 8, 10, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom-color: var(--line);
  }
  nav .wrap { display: flex; align-items: center; justify-content: space-between; gap: 20px; }
  .nav-brand {
    font-family: var(--display);
    font-weight: 800;
    font-size: 13px;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    text-decoration: none;
  }
  .nav-login {
    appearance: none;
    background: none;
    border: none;
    padding: 6px 0;
    font-family: var(--mono);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--mute);
    cursor: pointer;
    transition: color .2s;
  }
  .nav-login:hover { color: var(--signal); }

  /* Hero */
  .hero {
    position: relative;
    min-height: 100vh;
    min-height: 100svh;
    display: flex;
    align-items: flex-end;
    overflow: hidden;
  }
  .hero-media {
    position: absolute;
    inset: 0;
    z-index: -2;
    background: var(--abyss) center 55% / cover no-repeat;
    background-image: url("./hero-waters.png");
  }
  .hero-media::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(8,8,10,0.6) 0%, rgba(8,8,10,0.15) 38%, rgba(8,8,10,0.72) 78%, var(--abyss) 100%);
  }
  .hero-inner {
    width: min(1080px, calc(100% - 44px));
    margin: 0 auto;
    padding: 0 0 clamp(64px, 11vh, 120px);
  }
  .brand-mark {
    font-weight: 900;
    font-size: clamp(40px, 6.4vw, 78px);
    line-height: 1;
    letter-spacing: -0.025em;
    text-transform: uppercase;
  }
  .brand-mark span { color: var(--signal); }
  .hero-line {
    margin-top: 22px;
    font-family: var(--display);
    font-weight: 600;
    font-size: clamp(17px, 1.9vw, 22px);
    letter-spacing: -0.01em;
  }
  .hero-sub {
    margin-top: 8px;
    font-family: var(--mono);
    font-size: 12px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--signal-2);
  }
  .cta-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }

  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 46px;
    padding: 0 20px;
    font-family: var(--mono);
    font-size: 11.5px;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    text-decoration: none;
    border: 1px solid transparent;
    border-radius: 2px;
    cursor: pointer;
    transition: filter .2s, border-color .2s, color .2s;
  }
  button.btn { appearance: none; }
  .btn-primary { background: var(--signal); color: #04121c; }
  .btn-primary:hover { filter: brightness(1.1); }
  .btn-ghost {
    background: transparent;
    border-color: var(--line-strong);
    color: var(--foam);
  }
  .btn-ghost:hover { border-color: var(--signal); color: var(--signal-2); }

  /* Sections */
  section { padding: clamp(72px, 9vw, 112px) 0; border-top: 1px solid var(--line); }
  /* Interior pages have no hero, so the first section clears the fixed nav. */
  .page-top { padding-top: clamp(128px, 15vh, 176px); border-top: none; }
  .page .nav-login { text-decoration: none; }
  .kicker {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    font-family: var(--mono);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.26em;
    text-transform: uppercase;
    color: var(--signal);
  }
  .kicker::before { content: ""; width: 24px; height: 1px; background: var(--signal); opacity: .6; }
  h2 {
    margin-top: 20px;
    font-size: clamp(26px, 3.6vw, 42px);
    font-weight: 800;
    max-width: 20ch;
  }
  .lede {
    margin-top: 20px;
    max-width: 56ch;
    font-size: clamp(15px, 1.5vw, 17.5px);
    color: var(--mist);
  }

  /* Tracks */
  .tracks {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
    margin-top: 40px;
  }
  @media (max-width: 760px) { .tracks { grid-template-columns: 1fr; } }
  .track {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    padding: 26px 24px;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 4px;
    text-decoration: none;
    transition: border-color .2s, background .2s;
  }
  .track:hover { border-color: rgba(111, 159, 192, 0.55); background: #131820; }
  .track .t {
    font-family: var(--mono);
    font-size: 10.5px;
    font-weight: 700;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--signal-2);
  }
  .track h3 {
    margin-top: 12px;
    font-size: 20px;
    font-weight: 800;
    text-transform: uppercase;
  }
  .track p { margin-top: 10px; color: var(--mist); font-size: 15px; }
  .track .note {
    display: block;
    margin-top: auto;
    padding-top: 18px;
    font-family: var(--mono);
    font-size: 11.5px;
    letter-spacing: 0.06em;
    color: var(--signal-2);
  }

  .seats { margin: 28px 0 0; padding: 0; list-style: none; max-width: 620px; }
  .seats li { padding: 14px 0; border-top: 1px solid var(--line); }
  .seats li:last-child { border-bottom: 1px solid var(--line); }
  .seats a {
    font-family: var(--mono);
    font-size: 12.5px;
    letter-spacing: 0.04em;
    color: var(--signal-2);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color .2s;
  }
  .seats a:hover { border-bottom-color: var(--signal-2); }
  .seats span { display: block; margin-top: 5px; font-size: 13.5px; color: var(--mute); }

  /* Terms */
  .terms {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
    margin: 40px 0 0;
    padding-top: 32px;
    border-top: 1px solid var(--line);
  }
  @media (max-width: 760px) { .terms { grid-template-columns: 1fr; gap: 24px; } }
  .terms dt {
    font-family: var(--mono);
    font-size: 10.5px;
    font-weight: 700;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--mute);
  }
  .terms dd {
    margin: 10px 0 0;
    font-family: var(--display);
    font-weight: 800;
    font-size: clamp(17px, 1.9vw, 21px);
    letter-spacing: -0.015em;
  }
  .terms dd span {
    display: block;
    margin-top: 6px;
    font-family: var(--body);
    font-weight: 400;
    font-size: 13.5px;
    color: var(--mist);
    letter-spacing: 0;
  }

  /* Society */
  .society { background: linear-gradient(180deg, var(--deep), var(--abyss)); }
  .members {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 26px;
    margin: 32px 0 0;
    padding: 0;
    list-style: none;
  }
  .members li {
    font-family: var(--mono);
    font-size: 11.5px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--mute);
  }

  /* Apply */
  form.apply { margin-top: 36px; max-width: 620px; }
  .fields { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
  @media (max-width: 620px) { .fields { grid-template-columns: 1fr; } }
  .field { display: flex; flex-direction: column; gap: 7px; }
  .field.full { grid-column: 1 / -1; }
  label {
    font-family: var(--mono);
    font-size: 10.5px;
    font-weight: 700;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--mute);
  }
  input, select, textarea {
    width: 100%;
    background: var(--card);
    border: 1px solid var(--line-strong);
    border-radius: 2px;
    color: var(--foam);
    font-family: var(--body);
    font-size: 15px;
    padding: 12px 14px;
    outline: none;
  }
  input:focus, select:focus, textarea:focus { border-color: var(--signal); }
  select { appearance: none; }
  textarea { min-height: 96px; resize: vertical; }
  textarea.tall { min-height: 180px; }
  label em {
    font-style: normal;
    font-weight: 400;
    letter-spacing: 0.08em;
    color: var(--mute);
    text-transform: lowercase;
  }
  .form-row { margin-top: 18px; display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
  .form-note { font-family: var(--mono); font-size: 11px; letter-spacing: 0.08em; color: var(--mute); }

  footer { padding: 32px 0 44px; border-top: 1px solid var(--line); }
  footer .wrap { display: flex; justify-content: space-between; gap: 14px; flex-wrap: wrap; }
  footer div {
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--mute);
  }

  /* Login modal */
  .overlay {
    position: fixed;
    inset: 0;
    z-index: 80;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 24px;
    background: rgba(0, 0, 0, 0.82);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
  }
  .overlay.open { display: flex; }
  .modal {
    width: 100%;
    max-width: 380px;
    background: var(--deep);
    border: 1px solid var(--line-strong);
    border-radius: 4px;
    padding: 32px 28px 26px;
    position: relative;
  }
  .modal .close {
    position: absolute;
    top: 12px;
    right: 14px;
    background: none;
    border: none;
    color: var(--mute);
    font-size: 20px;
    cursor: pointer;
    line-height: 1;
  }
  .modal .close:hover { color: var(--foam); }
  .modal h2 { margin-top: 10px; font-size: 22px; text-transform: uppercase; max-width: none; }
  .modal .deny { margin-top: 10px; font-size: 13px; color: var(--mute); }
  .modal form { display: flex; flex-direction: column; gap: 12px; margin-top: 22px; }
  .modal .err { min-height: 15px; font-family: var(--mono); font-size: 11px; color: #c08a68; }

  .reveal { opacity: 0; transform: translateY(16px); transition: opacity .7s ease, transform .7s ease; }
  .reveal.in { opacity: 1; transform: none; }
  @media (prefers-reduced-motion: reduce) {
    .reveal { opacity: 1; transform: none; transition: none; }
  }