/* Fish landing page — implements the "Fish Lander" Claude Design canvas.
   Tokens are lifted from the Fish design system (tokens/colors.css etc.). */

:root {
  /* surfaces */
  --bg: #071220;
  --panel: #0B1B2D;
  --panel2: #0D2034;

  /* hairlines: arctic at low alpha, never grey */
  --line: rgba(124, 211, 255, 0.13);
  --line-strong: rgba(124, 211, 255, 0.22);
  --line-diagram: rgba(124, 211, 255, 0.30);
  --line-core: rgba(124, 211, 255, 0.35);

  /* text */
  --ink: #E9F3FB;
  --muted: #87A0B6;
  --faint: #5E7488;

  /* accent */
  --arctic: #8FE0FF;
  --arctic-soft: #7CD3FF;
  --arctic-lift: #B4F4FF;
  --on-arctic: #071220;

  /* washes */
  --wash-6: rgba(124, 211, 255, 0.06);
  --wash-8: rgba(124, 211, 255, 0.08);
  --wash-11: rgba(124, 211, 255, 0.11);
  --wash-12: rgba(124, 211, 255, 0.12);

  --ok: #6cd97e;

  --font: "Geist", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --shadow-menu: 0 12px 28px rgba(0, 0, 0, 0.45);

  --container: 1280px;
  --gutter: 48px;
  --dur-fast: .12s;
}

/* ---------- base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
html, body { margin: 0; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
a { color: var(--arctic); text-decoration: none; transition: color var(--dur-fast) ease, background var(--dur-fast) ease; }
a:hover { color: var(--arctic-lift); }
img { display: block; max-width: 100%; }
button { font: inherit; }
::selection { background: rgba(124, 211, 255, 0.25); color: var(--ink); }
:focus-visible { outline: 2px solid var(--arctic); outline-offset: 2px; }

h1, h2, h3 { margin: 0; font-weight: 600; }
h1 { font-size: 52px; line-height: 1.08; letter-spacing: -0.02em; margin-bottom: 24px; }
h2 { font-size: 30px; line-height: 1.2; letter-spacing: -0.015em; }
h3 { font-size: 19px; margin-bottom: 14px; }

.kicker {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--faint);
  margin-bottom: 14px;
}
.mono { font-family: var(--font-mono); }

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 72px var(--gutter);
}
.band { border-top: 1px solid var(--line); }

/* ---------- buttons ---------- */
.btn {
  display: inline-block;
  font-size: 14px;
  padding: 12px 22px;
  border-radius: 7px;
  line-height: 1.2;
  white-space: nowrap;
}
.btn-primary {
  background: var(--arctic);
  color: var(--on-arctic);
  font-weight: 600;
}
.btn-primary:hover { background: var(--arctic-soft); color: var(--on-arctic); }
.btn-outline {
  border: 1px solid var(--line-strong);
  color: var(--arctic);
}
.btn-outline:hover { background: var(--wash-6); color: var(--arctic); }
.actions { display: flex; gap: 12px; flex-wrap: wrap; }

/* ---------- nav ---------- */
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px var(--gutter);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 12px; color: var(--ink); }
.brand:hover { color: var(--ink); }
.brand-mark { width: 28px; height: 28px; border-radius: 8px; }
.brand-name { font-weight: 600; font-size: 15px; letter-spacing: -0.01em; }
.brand-by { color: var(--faint); font-size: 12px; font-family: var(--font-mono); }

.lang { position: relative; }
.lang-toggle {
  display: flex;
  align-items: center;
  gap: 7px;
  background: transparent;
  border: none;
  padding: 6px 8px;
  border-radius: 7px;
  cursor: pointer;
  color: var(--faint);
  transition: background var(--dur-fast) ease;
}
.lang-toggle:hover { background: var(--wash-6); }
.flag { border-radius: 2px; display: block; }
.flag[hidden] { display: none; }
.lang-menu {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  z-index: 40;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 5px;
  background: var(--panel);
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  box-shadow: var(--shadow-menu);
}
.lang-menu[hidden] { display: none; }
.lang-option {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 8px 10px;
  border: none;
  border-radius: 7px;
  background: transparent;
  color: var(--muted);
  font-size: 13px;
  font-weight: 500;
  text-align: left;
  cursor: pointer;
  transition: background var(--dur-fast) ease, color var(--dur-fast) ease;
}
.lang-option:hover { background: var(--wash-8); color: var(--ink); }
.lang-option svg { border-radius: 2px; }

/* ---------- hero ---------- */
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  gap: 64px;
  padding: 88px var(--gutter) 80px;
  max-width: var(--container);
  margin: 0 auto;
}
.hero .kicker { margin-bottom: 22px; }
.lede {
  font-size: 16.5px;
  line-height: 1.65;
  color: var(--muted);
  margin: 0 0 36px;
  max-width: 520px;
}

/* layer diagram */
.diagram {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  padding-top: 44px;
}
.diagram-row { display: grid; gap: 8px; }
.diagram-sources { grid-template-columns: repeat(4, 1fr); }
.diagram-outputs { grid-template-columns: repeat(3, 1fr); }
.node {
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 10px 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--muted);
}
.node-out {
  border-color: var(--line-strong);
  background: var(--wash-6);
  color: var(--arctic);
  text-align: center;
}
.diagram-lines { display: flex; justify-content: space-around; height: 34px; }
.diagram-lines i { display: block; width: 1px; background: var(--line-diagram); }
.diagram-core {
  background: var(--panel);
  border: 1px solid var(--line-core);
  border-radius: 10px;
  padding: 22px 24px;
  text-align: center;
}
.diagram-core-brand { display: flex; align-items: center; justify-content: center; gap: 10px; }
.diagram-core-brand img { width: 24px; height: 24px; border-radius: 7px; }
.diagram-core-brand span { font-weight: 600; font-size: 15px; }
.diagram-core-steps {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  color: var(--faint);
  margin-top: 8px;
}

/* ---------- product showcase ---------- */
.showcase {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  gap: 24px;
  align-items: start;
}
.shot { margin: 0; min-width: 0; }
.shot figcaption { font-size: 12.5px; color: var(--faint); margin-top: 10px; }

.window {
  background: var(--panel);
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  overflow: hidden;
}
.window-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 11px 16px;
  border-bottom: 1px solid var(--line);
}
.dot { width: 9px; height: 9px; border-radius: 50%; background: var(--faint); opacity: 0.45; }
.window-title { font-family: var(--font-mono); font-size: 11px; color: var(--faint); margin-left: 10px; }

/* chat workspace mock */
.workspace {
  display: grid;
  grid-template-columns: 200px 1fr;
  background: var(--bg);
}
.workspace-side { border-right: 1px solid var(--line); padding: 18px 12px; }
.side-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
  padding: 0 10px 8px;
}
.side-label svg { color: var(--faint); }
.side-list { display: flex; flex-direction: column; gap: 2px; }
.side-row {
  padding: 10px 12px 10px 33px;
  font-size: 14px;
  font-weight: 500;
  color: var(--muted);
  border-radius: 9px;
}
.side-row.is-active { background: var(--wash-11); color: var(--ink); }

.thread {
  padding: 22px 22px 18px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  min-height: 300px;
  min-width: 0;
}
.bubble-user {
  align-self: flex-end;
  max-width: 78%;
  background: linear-gradient(135deg, var(--arctic-soft), var(--arctic-lift));
  color: var(--on-arctic);
  font-weight: 500;
  border-radius: 16px;
  border-top-right-radius: 5px;
  padding: 13px 16px;
  font-size: 13.5px;
}
.msg { align-self: flex-start; display: flex; gap: 12px; max-width: 88%; }
.msg-avatar {
  width: 32px;
  height: 32px;
  border-radius: 9px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  border: 1px solid var(--line);
  margin-top: 1px;
}
.msg-body { display: flex; flex-direction: column; gap: 5px; min-width: 0; }
.msg-author { font-size: 11.5px; font-weight: 600; color: var(--muted); padding: 0 2px; }
.msg-text { font-size: 13.5px; line-height: 1.55; color: var(--ink); padding: 2px; }
.msg-link { color: var(--arctic); text-decoration: underline; text-underline-offset: 2px; }
.msg-feedback { display: flex; gap: 12px; margin-top: 4px; color: var(--faint); }

.composer {
  margin-top: auto;
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--panel2);
  border: 1px solid var(--line-strong);
  border-radius: 26px;
  padding: 6px 6px 6px 20px;
  font-size: 14px;
  color: var(--faint);
}
.composer-btn, .search-btn {
  margin-left: auto;
  flex-shrink: 0;
  border-radius: 50%;
  background: var(--arctic);
  color: var(--on-arctic);
  display: flex;
  align-items: center;
  justify-content: center;
}
.composer-btn { width: 36px; height: 36px; }
.search-btn { width: 34px; height: 34px; }

/* retrieval search mock */
.search { padding: 18px; background: var(--bg); }
.search-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--panel2);
  border: 1px solid var(--line-strong);
  border-radius: 26px;
  padding: 6px 6px 6px 18px;
  font-size: 13.5px;
  color: var(--ink);
}
.search-count { font-size: 12px; color: var(--faint); margin-top: 10px; }
.results { display: flex; flex-direction: column; gap: 10px; margin-top: 8px; }
.result {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 7px;
}
.result-title { display: flex; align-items: center; gap: 7px; font-size: 13px; font-weight: 600; }
.result-title svg { color: var(--arctic); flex-shrink: 0; }
.result-meta { display: flex; align-items: center; gap: 10px; font-size: 11.5px; color: var(--faint); }
.score {
  background: var(--wash-8);
  color: var(--arctic);
  font-weight: 600;
  padding: 1px 7px;
  border-radius: 999px;
}
.result-text { font-size: 13px; line-height: 1.55; color: var(--ink); }
.hl { color: var(--arctic); background: var(--wash-12); border-radius: 3px; padding: 0 2px; }
.ok { color: var(--ok); }

/* ---------- problem / use case ---------- */
.split {
  display: grid;
  grid-template-columns: minmax(0, 360px) minmax(0, 1fr);
  gap: 64px;
}
.prose { font-size: 15.5px; line-height: 1.7; color: var(--muted); max-width: 860px; }
.prose p { margin: 0 0 18px; }
.prose p:last-child { margin-bottom: 0; }
.link { font-size: 14px; }

.cards {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
  margin-top: 8px;
}
.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 32px;
}
.card p { font-size: 14.5px; line-height: 1.65; color: var(--muted); margin: 0 0 18px; }

.partner { display: flex; align-items: center; gap: 14px; margin-bottom: 16px; }
.partner img { height: 56px; width: auto; }
.partner span { font-size: 28px; font-weight: 600; letter-spacing: -0.015em; color: var(--ink); }

/* ---------- closing ---------- */
.closing { padding: 80px var(--gutter); text-align: center; }
.closing h2 { font-size: 28px; margin: 0 auto 16px; max-width: 640px; }
.closing > p { color: var(--muted); font-size: 15px; margin: 0 0 28px; }
.closing .btn { padding: 12px 24px; }
.footer {
  margin-top: 64px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 12.5px;
  color: var(--faint);
}

/* ---------- reveal on scroll (set up by js/main.js) ---------- */
@media (prefers-reduced-motion: no-preference) {
  .js [data-reveal="group"] > * {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity .65s cubic-bezier(.22, .61, .36, 1), transform .65s cubic-bezier(.22, .61, .36, 1);
  }
  .js [data-reveal="group"] > .is-visible {
    opacity: 1;
    transform: none;
  }
}

/* ---------- responsive (the canvas is desktop-only; these are additions) ---------- */
@media (max-width: 1024px) {
  :root { --gutter: 32px; }
  h1 { font-size: 44px; }
  .hero { gap: 48px; }
  .showcase { grid-template-columns: 1fr; }
  .split { gap: 40px; }
}

@media (max-width: 820px) {
  :root { --gutter: 24px; }
  h1 { font-size: 38px; }
  h2 { font-size: 26px; }
  .container { padding-top: 56px; padding-bottom: 56px; }
  .hero { grid-template-columns: 1fr; gap: 48px; padding-top: 56px; padding-bottom: 56px; }
  .diagram { padding-top: 0; }
  .split { grid-template-columns: 1fr; gap: 24px; }
  .cards { margin-top: 16px; }
  .workspace { grid-template-columns: 1fr; }
  .workspace-side { display: none; }
}

@media (max-width: 560px) {
  :root { --gutter: 20px; }
  h1 { font-size: 32px; }
  .brand-by { display: none; }
  .diagram-sources { grid-template-columns: repeat(2, 1fr); }
  .diagram-outputs { grid-template-columns: 1fr; }
  .diagram-lines { height: 24px; }
  .diagram-lines i:nth-child(n+3) { display: none; }
  .cards { grid-template-columns: 1fr; }
  .card { padding: 24px; }
  .partner span { font-size: 24px; }
  .closing { padding-top: 56px; padding-bottom: 56px; }
  .footer { flex-direction: column; align-items: center; text-align: center; }
}