:root {
  --bg: #f6f6f3;
  --surface: #ffffff;
  --text: #1c1f1d;
  --muted: #5d645f;
  --border: #dfe2dd;
  --accent: #2f6b58;
  --accent-text: #ffffff;
  --user-bg: #e3efe9;
  --user-text: #16302a;
  --info-bg: #e8f0fb;
  --info-text: #1d3b66;
  --warn-bg: #fdf3dc;
  --warn-text: #5b4200;
  --error-bg: #fbe6e4;
  --error-text: #6b1d16;
  --focus: #2f6b58;
  --radius: 14px;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111312;
    --surface: #1a1d1b;
    --text: #e6e9e7;
    --muted: #9aa29d;
    --border: #2c312e;
    --accent: #7cc3ab;
    --accent-text: #0d1f19;
    --user-bg: #22362f;
    --user-text: #def0e8;
    --info-bg: #17263a;
    --info-text: #bcd3f2;
    --warn-bg: #33290f;
    --warn-text: #f3d891;
    --error-bg: #3a1a17;
    --error-text: #f4c2bb;
    --focus: #7cc3ab;
  }
}

* { box-sizing: border-box; }

html, body { margin: 0; }

body {
  background: var(--bg);
  color: var(--text);
  font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-text-size-adjust: 100%;
}

.page {
  max-width: 760px;
  min-height: 100dvh;
  margin: 0 auto;
  padding: 0 16px;
  display: flex;
  flex-direction: column;
}

.top { padding: 28px 0 8px; }
.top h1 { margin: 0; font-size: 1.5rem; letter-spacing: -0.01em; }
.sub { margin: 4px 0 0; color: var(--muted); }

.notice {
  margin: 12px 0 0;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--muted);
  font-size: 0.9rem;
}

.banner {
  margin: 0 0 8px;
  padding: 10px 14px;
  border-radius: var(--radius);
  display: flex;
  flex-wrap: wrap;
  gap: 4px 12px;
  align-items: center;
  background: var(--info-bg);
  color: var(--info-text);
}
.banner[hidden] { display: none; }
.banner[data-kind="warn"] { background: var(--warn-bg); color: var(--warn-text); }
.banner[data-kind="error"] { background: var(--error-bg); color: var(--error-text); }

.chat {
  flex: 1;
  padding: 16px 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.empty { color: var(--muted); text-align: center; margin: 32px 0; }

.msg {
  max-width: 88%;
  padding: 10px 14px;
  border-radius: var(--radius);
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
.msg.user {
  align-self: flex-end;
  background: var(--user-bg);
  color: var(--user-text);
  border-bottom-right-radius: 4px;
}
.msg.assistant {
  align-self: flex-start;
  background: var(--surface);
  border: 1px solid var(--border);
  border-bottom-left-radius: 4px;
}
.msg .status {
  display: block;
  color: var(--muted);
  font-size: 0.88rem;
}
.msg .status:empty { display: none; }
.msg[data-status="pending"] .text:empty::after,
.msg[data-status="waiting"] .text:empty::after {
  content: "…";
  color: var(--muted);
}
.msg[data-status="error"] .status { color: var(--error-text); }

.turnstile { display: flex; justify-content: center; }
.turnstile:empty { display: none; }

.composer {
  position: sticky;
  bottom: 0;
  padding: 10px 0 calc(12px + env(safe-area-inset-bottom));
  background: linear-gradient(to bottom, transparent, var(--bg) 14px);
}

textarea {
  width: 100%;
  min-height: 48px;
  max-height: 40vh;
  resize: none;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  font: inherit;
  font-size: 16px; /* >= 16px stops iOS from zooming on focus */
}
textarea:disabled { opacity: 0.65; }

.actions {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 8px;
}
.count { margin-right: auto; color: var(--muted); font-size: 0.85rem; font-variant-numeric: tabular-nums; }

button {
  min-height: 44px;
  padding: 0 18px;
  border: 1px solid transparent;
  border-radius: 999px;
  background: var(--accent);
  color: var(--accent-text);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}
button.secondary {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
  font-weight: 500;
}
button.link {
  min-height: 0;
  padding: 0;
  background: none;
  color: inherit;
  text-decoration: underline;
  font-weight: 600;
}
button:disabled {
  background: var(--border);
  color: var(--muted);
  border-color: transparent;
  cursor: not-allowed;
}
button.secondary:disabled { background: transparent; border-color: var(--border); }
button[hidden] { display: none; }

:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }

.foot {
  padding: 4px 0 20px;
  color: var(--muted);
  font-size: 0.8rem;
  text-align: center;
}
.foot a { color: inherit; }

@media (max-width: 480px) {
  .top { padding-top: 18px; }
  .msg { max-width: 94%; }
}