:root {
  --bg: #f7f5f0;
  --surface: #ffffff;
  --ink: #141a2b;
  --muted: #5d6375;
  --line: #e2dfd6;
  --blue: #1f3a93;
  --blue-ink: #ffffff;
  --red: #d6303a;
  --chip: #ffffff;
  --chip-hover: #eef1fa;
  --user: #1f3a93;
  --user-ink: #ffffff;
  --shadow: 0 1px 2px rgba(20, 26, 43, .04), 0 8px 24px rgba(20, 26, 43, .06);
  --serif: "Instrument Serif", Georgia, "Times New Roman", serif;
  --sans: Inter, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #11141c;
    --surface: #191d28;
    --ink: #eceef4;
    --muted: #9aa0b2;
    --line: #2a2f3d;
    --blue: #7d97ff;
    --blue-ink: #0d1020;
    --red: #ff6b73;
    --chip: #191d28;
    --chip-hover: #222838;
    --user: #2b3f86;
    --user-ink: #ffffff;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .25);
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.6 var(--sans);
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--blue); text-underline-offset: 2px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

.tricolore { display: flex; height: 4px; }
.tricolore span { flex: 1; }
.tricolore span:nth-child(1) { background: #1f3a93; }
.tricolore span:nth-child(2) { background: #fff; }
.tricolore span:nth-child(3) { background: #d6303a; }

.top {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px clamp(16px, 4vw, 40px);
}
.wordmark {
  font: 400 28px/1 var(--serif);
  color: var(--ink);
  text-decoration: none;
  letter-spacing: -.01em;
}
.wordmark span { color: var(--red); }
.top nav { display: flex; gap: 20px; align-items: center; }
.link {
  font: 500 14px var(--sans); color: var(--muted); text-decoration: none;
  background: none; border: 0; cursor: pointer; padding: 4px 0;
}
.link:hover { color: var(--ink); }

main {
  flex: 1;
  width: 100%;
  max-width: 760px;
  margin: 0 auto;
  padding: 0 16px;
  display: flex;
  flex-direction: column;
}

.hero { text-align: center; padding: clamp(40px, 12vh, 120px) 0 32px; }
.hero h1 {
  font: 400 clamp(40px, 7vw, 68px)/1.05 var(--serif);
  letter-spacing: -.02em;
  margin: 0 0 16px;
}
.hero h1 em { font-style: italic; color: var(--blue); }
.lede { color: var(--muted); font-size: 17px; margin: 0 auto; max-width: 520px; }

.composer {
  position: relative;
  display: flex; align-items: flex-end; gap: 8px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 28px;
  padding: 10px 10px 10px 22px;
  box-shadow: var(--shadow);
  transition: border-color .15s;
}
.composer:focus-within { border-color: var(--blue); }
.composer textarea {
  flex: 1; resize: none; border: 0; outline: 0; background: transparent;
  color: var(--ink); font: 17px/1.5 var(--sans);
  padding: 9px 0; max-height: 200px; overflow-y: hidden;
}
.composer textarea::placeholder { color: var(--muted); opacity: .8; }
.composer-actions { display: flex; gap: 6px; }
.icon-btn, .send {
  width: 42px; height: 42px; border-radius: 50%; border: 0; cursor: pointer;
  display: grid; place-items: center; flex: none;
}
.icon-btn svg, .send svg { width: 20px; height: 20px; fill: currentColor; }
.icon-btn { background: transparent; color: var(--muted); }
.icon-btn:hover { background: var(--chip-hover); color: var(--ink); }
.icon-btn.listening { color: var(--red); background: var(--chip-hover); animation: pulse 1.2s infinite; }
.send { background: var(--blue); color: var(--blue-ink); }
.send:disabled { opacity: .35; cursor: default; }

.suggestions {
  display: flex; flex-wrap: wrap; justify-content: center; gap: 8px;
  margin: 24px 0 8px;
}
.suggestions button {
  font: 500 14px var(--sans); color: var(--ink);
  background: var(--chip); border: 1px solid var(--line); border-radius: 999px;
  padding: 8px 14px; cursor: pointer;
}
.suggestions button:hover { background: var(--chip-hover); border-color: var(--blue); }

.sources { text-align: center; margin: 40px 0 24px; color: var(--muted); font-size: 13px; }
.sources p { margin: 0 0 8px; text-transform: uppercase; letter-spacing: .08em; font-size: 11px; font-weight: 600; }
.sources ul { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; justify-content: center; gap: 4px 18px; }
.sources a { color: var(--muted); text-decoration: none; }
.sources a:hover { color: var(--ink); text-decoration: underline; }

/* Conversation mode */
body.chatting .hero, body.chatting .suggestions, body.chatting .sources { display: none; }
body.chatting .composer { position: sticky; bottom: 16px; margin-top: auto; }
body.chatting main { padding-bottom: 16px; }

.thread { display: flex; flex-direction: column; gap: 22px; padding: 12px 0 28px; }
.msg-user {
  align-self: flex-end; max-width: 85%;
  background: var(--user); color: var(--user-ink);
  padding: 10px 16px; border-radius: 20px 20px 4px 20px;
  white-space: pre-wrap; overflow-wrap: anywhere;
}
.msg-bot { align-self: stretch; overflow-wrap: anywhere; }
.steps { display: flex; flex-direction: column; gap: 4px; margin-bottom: 10px; }
.step { font-size: 13px; color: var(--muted); display: flex; align-items: center; gap: 8px; }
.step::before {
  content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--line); flex: none;
}
.step.active::before { background: var(--blue); animation: pulse 1s infinite; }
.answer > :first-child { margin-top: 0; }
.answer > :last-child { margin-bottom: 0; }
.answer h1, .answer h2, .answer h3 { font: 600 17px/1.4 var(--sans); margin: 20px 0 6px; }
.answer p { margin: 0 0 12px; }
.answer ul, .answer ol { padding-left: 22px; margin: 0 0 12px; }
.answer li { margin: 3px 0; }
.answer code { font-size: .9em; background: var(--chip-hover); padding: 1px 5px; border-radius: 4px; }
.answer blockquote { margin: 0 0 12px; padding-left: 12px; border-left: 3px solid var(--red); color: var(--muted); }
.answer table { border-collapse: collapse; font-size: 14px; margin: 0 0 12px; display: block; overflow-x: auto; }
.answer th, .answer td { border: 1px solid var(--line); padding: 5px 9px; text-align: left; }
.error { color: var(--red); font-size: 14px; }
.typing { display: inline-flex; gap: 4px; padding: 6px 0; }
.typing i { width: 6px; height: 6px; border-radius: 50%; background: var(--muted); animation: blink 1.2s infinite both; }
.typing i:nth-child(2) { animation-delay: .2s; }
.typing i:nth-child(3) { animation-delay: .4s; }

.foot { border-top: 1px solid var(--line); margin-top: 32px; padding: 28px 16px 36px; color: var(--muted); font-size: 14px; }
.about { max-width: 760px; margin: 0 auto; }
.about h2 { font: 400 24px var(--serif); color: var(--ink); margin: 0 0 8px; }
.fine { max-width: 760px; margin: 16px auto 0; font-size: 12px; }
body.chatting .foot { display: none; }

@keyframes pulse { 50% { opacity: .35; } }
@keyframes blink { 0%, 80%, 100% { opacity: .2; } 40% { opacity: 1; } }

@media (max-width: 560px) {
  .top { padding: 14px 16px; }
  .wordmark { font-size: 24px; }
  .composer { padding-left: 16px; border-radius: 24px; }
  .suggestions button { font-size: 13px; }
}