:root {
  color-scheme: light dark;
  --bg: #f6f4f0;
  --surface: #ffffff;
  --surface-2: #efece6;
  --ink: #1d1b17;
  --ink-soft: #5d574d;
  --ink-faint: #8b8478;
  --line: #e2ddd3;
  --accent: #6b5b3e;
  --accent-soft: #efe7d6;
  --user-bubble: #2f2a22;
  --user-ink: #f7f4ee;
  --danger: #8c2f22;
  --radius: 14px;
  --max: 46rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #171613;
    --surface: #201e1a;
    --surface-2: #29261f;
    --ink: #ece8e0;
    --ink-soft: #b3ac9f;
    --ink-faint: #857e72;
    --line: #35312a;
    --accent: #cbb287;
    --accent-soft: #2e2921;
    --user-bubble: #3a352c;
    --user-ink: #f2eee6;
    --danger: #e08a7a;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  -webkit-text-size-adjust: 100%;
}

body { display: flex; flex-direction: column; }

/* ---------- header ---------- */

header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: .75rem;
  padding: .7rem 1rem;
  padding-top: max(.7rem, env(safe-area-inset-top));
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(12px);
  border-bottom: 1px solid var(--line);
}

header .mark {
  width: 30px; height: 30px; flex: none;
  border-radius: 9px;
  background: var(--accent);
  color: var(--bg);
  display: grid; place-items: center;
  font-weight: 700; font-size: .8rem; letter-spacing: .02em;
}

header h1 {
  margin: 0;
  font-size: .98rem;
  font-weight: 600;
  letter-spacing: -.01em;
  line-height: 1.2;
}
header .sub { display: block; font-size: .74rem; font-weight: 400; color: var(--ink-faint); }
header .spacer { flex: 1; }

.iconbtn {
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink-soft);
  border-radius: 9px;
  width: 34px; height: 34px;
  display: grid; place-items: center;
  cursor: pointer;
  padding: 0;
}
.iconbtn:hover { color: var(--ink); border-color: var(--ink-faint); }
.iconbtn svg { width: 17px; height: 17px; }

/* ---------- conversation ---------- */

main {
  flex: 1;
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding: 1.1rem 1rem 1rem;
}

.turn { margin-bottom: 1.6rem; }

.turn.user {
  display: flex;
  justify-content: flex-end;
}
.turn.user .body {
  background: var(--user-bubble);
  color: var(--user-ink);
  padding: .6rem .9rem;
  border-radius: var(--radius) var(--radius) 4px var(--radius);
  max-width: 88%;
  white-space: pre-wrap;
}
.turn.user .body img {
  display: block;
  border-radius: 9px;
  margin-bottom: .5rem;
  max-height: 220px;
}

.turn.assistant .body { max-width: 100%; }

.turn.assistant .body > :first-child { margin-top: 0; }
.turn.assistant .body > :last-child { margin-bottom: 0; }

.body h2, .body h3 { font-size: 1rem; margin: 1.3em 0 .5em; letter-spacing: -.01em; }
.body p { margin: 0 0 .85em; }
.body ul, .body ol { margin: 0 0 .9em; padding-left: 1.25rem; }
.body li { margin-bottom: .3em; }
.body code {
  background: var(--surface-2);
  padding: .1em .35em;
  border-radius: 5px;
  font-size: .88em;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}
.body pre {
  background: var(--surface-2);
  padding: .8rem;
  border-radius: 10px;
  overflow-x: auto;
}
.body pre code { background: none; padding: 0; }
.body a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 2px; }
.body blockquote {
  margin: 0 0 .9em;
  padding-left: .9rem;
  border-left: 3px solid var(--line);
  color: var(--ink-soft);
}
.body figure {
  margin: 1rem 0;
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  background: var(--surface);
}
.body figure img { display: block; width: 100%; height: auto; }
.body figcaption {
  font-size: .8rem;
  color: var(--ink-soft);
  padding: .5rem .75rem;
  border-top: 1px solid var(--line);
}
.body table { border-collapse: collapse; width: 100%; margin: 0 0 .9em; font-size: .92em; }
.body th, .body td { border: 1px solid var(--line); padding: .35rem .5rem; text-align: left; }

/* ---------- activity ---------- */

.activity {
  display: flex;
  flex-wrap: wrap;
  gap: .35rem;
  margin-bottom: .7rem;
}
.chip {
  font-size: .76rem;
  color: var(--ink-soft);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: .17rem .6rem;
}
.chip.live::after {
  content: "";
  display: inline-block;
  width: .4em; height: .4em;
  margin-left: .45em;
  border-radius: 50%;
  background: var(--accent);
  animation: pulse 1.1s ease-in-out infinite;
}
@keyframes pulse { 0%,100% { opacity: .25 } 50% { opacity: 1 } }

.thinking { color: var(--ink-faint); font-size: .88rem; }
.thinking::after { content: "."; animation: dots 1.4s steps(4,end) infinite; }
@keyframes dots { 0% { content:"." } 33% { content:".." } 66% { content:"..." } }

.error {
  color: var(--danger);
  border: 1px solid color-mix(in srgb, var(--danger) 35%, transparent);
  background: color-mix(in srgb, var(--danger) 8%, transparent);
  padding: .6rem .8rem;
  border-radius: 10px;
  font-size: .9rem;
}

/* ---------- empty state ---------- */

.empty { padding: 1.5rem 0 0; }
.empty h2 {
  font-size: 1.35rem;
  font-weight: 600;
  letter-spacing: -.02em;
  margin: 0 0 .4rem;
}
.empty p { color: var(--ink-soft); margin: 0 0 1.4rem; font-size: .95rem; }
.suggestions { display: grid; gap: .5rem; }
.suggestion {
  text-align: left;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  border-radius: 11px;
  padding: .7rem .85rem;
  font: inherit;
  font-size: .9rem;
  cursor: pointer;
  line-height: 1.4;
}
.suggestion:hover { border-color: var(--accent); background: var(--accent-soft); }

/* ---------- composer ---------- */

footer {
  position: sticky;
  bottom: 0;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(12px);
  border-top: 1px solid var(--line);
  padding: .6rem 1rem;
  padding-bottom: max(.6rem, env(safe-area-inset-bottom));
}
.composer {
  max-width: var(--max);
  margin: 0 auto;
  display: flex;
  align-items: flex-end;
  gap: .5rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: .4rem .4rem .4rem .75rem;
}
.composer:focus-within { border-color: var(--accent); }

textarea {
  flex: 1;
  border: 0;
  background: none;
  color: inherit;
  font: inherit;
  resize: none;
  outline: none;
  max-height: 8.5rem;
  padding: .35rem 0;
  line-height: 1.45;
}

.roundbtn {
  flex: none;
  width: 36px; height: 36px;
  border-radius: 10px;
  border: 0;
  display: grid; place-items: center;
  cursor: pointer;
  background: var(--surface-2);
  color: var(--ink-soft);
}
.roundbtn svg { width: 18px; height: 18px; }
.roundbtn.send { background: var(--accent); color: var(--bg); }
.roundbtn:disabled { opacity: .4; cursor: default; }

.attachment {
  max-width: var(--max);
  margin: 0 auto .5rem;
  display: flex;
  align-items: center;
  gap: .6rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 11px;
  padding: .45rem .6rem;
  font-size: .82rem;
  color: var(--ink-soft);
}
.attachment img { width: 42px; height: 42px; object-fit: cover; border-radius: 7px; flex: none; }
.attachment .grow { flex: 1; min-width: 0; }
.attachment strong { color: var(--ink); font-weight: 600; display: block; font-size: .84rem; }
.attachment .drop {
  border: 0; background: none; color: var(--ink-faint);
  cursor: pointer; font: inherit; font-size: 1.1rem; padding: 0 .25rem;
}

.hint {
  max-width: var(--max);
  margin: .45rem auto 0;
  font-size: .72rem;
  color: var(--ink-faint);
  text-align: center;
}

/* ---------- sign in ---------- */

.signin {
  min-height: 100%;
  display: grid;
  place-items: center;
  padding: 2rem 1.25rem;
  text-align: center;
}
.signin .card {
  max-width: 24rem;
  width: 100%;
}
.signin .mark {
  width: 56px; height: 56px; margin: 0 auto 1.2rem;
  border-radius: 16px; background: var(--accent); color: var(--bg);
  display: grid; place-items: center; font-weight: 700; letter-spacing: .02em;
}
.signin h1 { font-size: 1.4rem; margin: 0 0 .4rem; letter-spacing: -.02em; }
.signin p { color: var(--ink-soft); font-size: .93rem; margin: 0 0 1.6rem; }
.google {
  display: inline-flex; align-items: center; gap: .6rem;
  background: var(--surface); color: var(--ink);
  border: 1px solid var(--line); border-radius: 10px;
  padding: .65rem 1.1rem; font: inherit; font-weight: 500;
  text-decoration: none; cursor: pointer;
}
.google:hover { border-color: var(--accent); }
.signin small { display: block; margin-top: 1.5rem; color: var(--ink-faint); font-size: .76rem; }