:root {
  --bg: #0f172a;
  --fg: #e2e8f0;
  --muted: #94a3b8;
  --primary: #3b82f6;
  --primary-600: #2563eb;
  --danger: #ef4444;
  --card: #111827;
  --border: #1f2937;
  --safe-top: env(safe-area-inset-top);
  --safe-bottom: env(safe-area-inset-bottom);
}

* {
  box-sizing: border-box;
}

html, body {
  height: 100%;
}

body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, Helvetica Neue, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  color: var(--fg);
  background: radial-gradient(1000px 600px at 20% -10%, rgba(59, 130, 246, 0.25), transparent 60%),
              radial-gradient(1200px 700px at 80% -10%, rgba(147, 51, 234, 0.2), transparent 60%),
              var(--bg);
  padding-top: max(0px, var(--safe-top));
  padding-bottom: max(0px, var(--safe-bottom));
}

.container {
  width: 100%;
  max-width: 980px;
  margin: 0 auto;
  padding: 0 16px;
}

.app-header {
  padding: 32px 0 12px 0;
}

.brand {
  margin: 0;
  font-size: 32px;
  letter-spacing: 0.5px;
}

.tagline {
  margin: 4px 0 0 0;
  color: var(--muted);
}

main.container {
  padding: 24px 0 40px 0;
}

.card {
  background: linear-gradient(180deg, rgba(255,255,255,0.03), rgba(255,255,255,0.01));
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.hidden { display: none; }

.form-row { margin-bottom: 14px; }
.form-row label { display: block; margin-bottom: 6px; color: var(--muted); }
.form-row input {
  width: 100%;
  padding: 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: #0b1220;
  color: var(--fg);
  font-size: 16px; /* évite le zoom iOS à la saisie */
}

.actions { display: flex; gap: 10px; }

.btn {
  padding: 10px 14px;
  border: 1px solid var(--border);
  background: #0b1220;
  color: var(--fg);
  border-radius: 10px;
  cursor: pointer;
  white-space: nowrap;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.btn:hover { filter: brightness(1.1); }
.btn.primary { background: var(--primary); border-color: var(--primary-600); }
.btn.danger { background: var(--danger); border-color: #b91c1c; }

.hint { color: var(--muted); margin-top: 10px; }

.chat-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.status { color: var(--muted); margin-top: 2px; }

.messages {
  height: 50vh;
  overflow: auto;
  padding: 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: #0b1220;
}

.msg { margin-bottom: 10px; }
.msg .meta { color: var(--muted); font-size: 12px; margin-bottom: 2px; }
.msg .bubble {
  display: inline-block;
  background: #111827;
  border: 1px solid var(--border);
  padding: 8px 10px;
  border-radius: 10px;
}

.composer {
  display: grid;
  grid-template-columns: 1fr auto auto auto;
  gap: 10px;
  margin-top: 12px;
  align-items: center;
  width: 100%;
}

.composer input[type="text"] {
  padding: 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: #0b1220;
  color: var(--fg);
  min-width: 0; /* permet à l'input de rétrécir en grid (évite le débordement des boutons) */
}

.file-input { display: none; }

.app-footer {
  margin-top: 40px;
  padding: 20px 0;
  color: var(--muted);
  border-top: 1px solid var(--border);
}

/* Mobile tweaks */
@media (max-width: 640px) {
  .brand { font-size: 26px; }
  .card { padding: 16px; }

  .messages { height: auto; }

  .composer {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: linear-gradient(180deg, rgba(15, 23, 42, 0.94), rgba(15, 23, 42, 1));
    border-top: 1px solid var(--border);
    padding: 8px 12px;
    padding-bottom: max(10px, var(--safe-bottom));
    display: flex;
    align-items: center;
    gap: 8px;
  }

  .btn { padding: 8px 12px; font-size: 14px; height: 44px; }
  .composer input[type="text"] { padding: 12px; font-size: 16px; flex: 1 1 auto; }
  main.container { padding-bottom: calc(120px + var(--safe-bottom)); }
}

@supports (height: 100dvh) {
  @media (max-width: 640px) {
    .messages {
      height: calc(100dvh - 270px - var(--safe-bottom));
    }
  }
}