* { box-sizing: border-box; }

:root {
  color-scheme: dark;
  --bg: #0a0a0c;
  --panel: #14141a;
  --panel-2: #1c1c24;
  --text: #e7e7ef;
  --muted: #8a8aa0;
  --accent: #ff7e3a;
  --user: #4cb0ff;
  --tool: #b97aff;
  --err: #ff6262;
  --border: #2a2a36;
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --safe-top: env(safe-area-inset-top, 0px);
  --tap: 44px;
}

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
  overscroll-behavior-y: none;
}

#app {
  display: flex;
  flex-direction: column;
  height: 100dvh;
  min-height: 100dvh;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: calc(10px + var(--safe-top)) 16px 10px;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
  flex: 0 0 auto;
}
header h1 { margin: 0; font-size: 16px; letter-spacing: 0.04em; text-transform: uppercase; color: var(--accent); }
.header-right { display: flex; align-items: center; gap: 10px; }
#status { font-size: 12px; color: var(--muted); }
#status.ok { color: #6ad26a; }
#status.err { color: var(--err); }

.screen { flex: 1; display: flex; flex-direction: column; min-height: 0; }
.hidden { display: none !important; }

#auth { align-items: center; justify-content: center; padding: 24px; }
#auth-form { display: flex; flex-direction: column; gap: 12px; max-width: 360px; width: 100%; }
#auth-form label { display: flex; flex-direction: column; gap: 6px; font-size: 13px; color: var(--muted); }
#auth-form input,
#msg-input {
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
  font: inherit;
  min-height: var(--tap);
}
#auth-form input:focus, #msg-input:focus { outline: none; border-color: var(--accent); }

button {
  background: var(--accent);
  color: #0a0a0c;
  border: 0;
  border-radius: 10px;
  padding: 10px 16px;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  min-height: var(--tap);
  min-width: var(--tap);
  touch-action: manipulation;
}
button:hover { filter: brightness(1.1); }
button:active { transform: translateY(1px); }
button:disabled { opacity: 0.5; cursor: not-allowed; }
.hint { font-size: 12px; color: var(--muted); margin: 0; }

#messages {
  flex: 1;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding: 12px 14px 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  scroll-behavior: smooth;
  overscroll-behavior: contain;
}

.msg { display: flex; flex-direction: column; gap: 4px; max-width: 92%; }
.msg .who { font-size: 11px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.06em; }
.msg .body { background: var(--panel); border: 1px solid var(--border); padding: 10px 12px; border-radius: 12px; white-space: pre-wrap; word-break: break-word; line-height: 1.5; }
.msg.user { align-self: flex-end; }
.msg.user .body { background: #16263a; border-color: #28547f; }
.msg.assistant .body { background: var(--panel); }
.msg.error .body { background: #3a1414; border-color: #6f2424; color: #ffdada; }

.tool { background: var(--panel-2); border: 1px solid var(--border); border-radius: 10px; padding: 6px 10px; font-size: 12px; color: var(--muted); }
.tool details summary { cursor: pointer; color: var(--tool); padding: 2px 0; }
.tool pre { background: #0c0c12; border: 1px solid var(--border); border-radius: 6px; padding: 8px; overflow-x: auto; font-size: 11px; color: var(--text); }

.progress { display: inline-flex; align-items: center; gap: 8px; align-self: flex-start; background: var(--panel-2); border: 1px solid var(--border); border-radius: 12px; padding: 8px 12px; font-size: 13px; color: var(--muted); max-width: 92%; }
.progress-dots { color: var(--accent); letter-spacing: 2px; animation: progress-pulse 1.2s ease-in-out infinite; }
.progress-label { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
@keyframes progress-pulse { 0%, 100% { opacity: 0.4; } 50% { opacity: 1; } }

#msg-form {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  padding: 10px 12px;
  padding-bottom: calc(10px + var(--safe-bottom));
  border-top: 1px solid var(--border);
  background: var(--panel);
  flex: 0 0 auto;
}
#msg-input {
  flex: 1;
  resize: none;
  max-height: 40dvh;
  min-height: var(--tap);
  line-height: 1.4;
}

.icon-btn {
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 50%;
  width: var(--tap);
  height: var(--tap);
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  cursor: pointer;
  font-size: 18px;
  user-select: none;
  -webkit-user-select: none;
}
.icon-btn:hover { filter: brightness(1.15); }
.icon-btn[aria-pressed="true"] { background: var(--accent); color: #0a0a0c; border-color: var(--accent); }
.icon-btn.recording { background: var(--err); color: #fff; border-color: var(--err); animation: rec-pulse 1s ease-in-out infinite; }
@keyframes rec-pulse { 0%, 100% { box-shadow: 0 0 0 0 rgba(255, 98, 98, 0.6); } 50% { box-shadow: 0 0 0 8px rgba(255, 98, 98, 0); } }

@media (max-width: 640px) {
  header { padding: calc(8px + var(--safe-top)) 12px 8px; }
  header h1 { font-size: 14px; }
  #messages { padding: 10px 12px 12px; gap: 8px; }
  .msg { max-width: 100%; }
  #msg-form { padding: 8px 10px; padding-bottom: calc(8px + var(--safe-bottom)); }
  /* iOS bumps the viewport on focus when input < 16px — keep 16px to prevent zoom. */
  #msg-input, #auth-form input { font-size: 16px; }
}