/* ai4picture shell styles.
 * BoardUI visual language, concrete values (from BoardUI theme.css):
 * neutral-100 #f7f7f7, neutral-200 #ebebeb, neutral-950 #0a0a0a,
 * neutral-500 #737373, neutral-400 #a3a3a3, blue-400 #3392ff,
 * Gemini gradient linear-gradient(89.58deg, #3186ff 0.28%, #346bf0 44.45%, #4ea0ff 99.55%),
 * radii 10px / 20px / 999px.
 */
* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  display: flex;
  flex-direction: column;
  background: #f7f7f7;
  color: #0a0a0a;
  font-family: Inter, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

button { font-family: inherit; cursor: pointer; }
button:disabled { cursor: not-allowed; opacity: 0.6; }

/* ---------- top bar ---------- */
.topbar {
  flex: 0 0 auto;
  background: #fff;
  border-bottom: 1px solid #ebebeb;
}
.topbar-inner {
  max-width: 960px;
  margin: 0 auto;
  height: 56px;
  padding: 0 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.brand { display: flex; align-items: center; gap: 10px; min-width: 0; }
.brand-mark {
  width: 32px;
  height: 32px;
  border-radius: 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  background: linear-gradient(89.58deg, #3186ff 0.28%, #346bf0 44.45%, #4ea0ff 99.55%);
  flex: 0 0 auto;
}
.brand-name { font-size: 17px; font-weight: 600; letter-spacing: -0.01em; }
.brand-sub { font-size: 13px; color: #737373; }
.model-badge {
  font-size: 12px;
  color: #737373;
  background: #f7f7f7;
  border: 1px solid #ebebeb;
  border-radius: 999px;
  padding: 4px 10px;
  white-space: nowrap;
}

/* ---------- chat ---------- */
.chat { flex: 1 1 auto; overflow-y: auto; }
.chat-inner { max-width: 768px; margin: 0 auto; padding: 24px 16px 32px; }

.hero { text-align: center; padding: 40px 8px 8px; }
.hero h1 {
  margin: 0 0 12px;
  font-size: 30px;
  line-height: 1.3;
  font-weight: 600;
  letter-spacing: -0.02em;
}
.hero-sub { margin: 0 auto 20px; max-width: 520px; color: #737373; font-size: 15px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }
.chip {
  background: #fff;
  border: 1px solid #ebebeb;
  border-radius: 999px;
  padding: 7px 14px;
  font-size: 14px;
  color: #0a0a0a;
}
.chip:hover { border-color: #d4d4d4; }

.messages { display: flex; flex-direction: column; gap: 24px; }
.messages:empty { display: none; }

.msg-user { display: flex; justify-content: flex-end; }
.bubble-user {
  max-width: 80%;
  background: #fff;
  border: 1px solid #ebebeb;
  border-radius: 20px;
  padding: 10px 16px;
  white-space: pre-wrap;
  word-break: break-word;
}

.msg-ai { display: flex; flex-direction: column; }
.card {
  background: #fff;
  border: 1px solid #ebebeb;
  border-radius: 20px;
  overflow: hidden;
  box-shadow: 0 1px 2px rgb(0 0 0 / 0.04);
}
.card img { display: block; width: 100%; aspect-ratio: 1 / 1; object-fit: cover; background: #f7f7f7; }
.card-meta { padding: 14px 16px 16px; }
.card-prompt { margin: 0 0 4px; font-size: 14px; color: #0a0a0a; word-break: break-word; }
.card-sub { margin: 0 0 12px; font-size: 12px; color: #a3a3a3; }
.card-actions { display: flex; gap: 8px; flex-wrap: wrap; }

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: none;
  border-radius: 999px;
  padding: 9px 18px;
  font-size: 14px;
  font-weight: 500;
  color: #fff;
  background: linear-gradient(89.58deg, #3186ff 0.28%, #346bf0 44.45%, #4ea0ff 99.55%);
}
.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 1px solid #ebebeb;
  border-radius: 999px;
  padding: 9px 18px;
  font-size: 14px;
  font-weight: 500;
  color: #0a0a0a;
  background: #fff;
}
.btn-ghost:hover { border-color: #d4d4d4; }

.loading-box { padding: 16px; }
.loading-img {
  aspect-ratio: 1 / 1;
  border-radius: 12px;
  background: linear-gradient(100deg, #f7f7f7 40%, #ebebeb 50%, #f7f7f7 60%);
  background-size: 200% 100%;
  animation: shimmer 1.4s infinite linear;
}
@keyframes shimmer { to { background-position: -200% 0; } }
.loading-text { margin: 12px 2px 0; font-size: 14px; color: #737373; }

.msg-error {
  background: #fff;
  border: 1px solid #fecaca;
  border-radius: 20px;
  padding: 14px 16px;
  font-size: 14px;
  color: #b91c1c;
}

/* ---------- composer ---------- */
.composer-wrap { flex: 0 0 auto; padding: 12px 16px 16px; }
.composer-inner { max-width: 768px; margin: 0 auto; }
.composer {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  background: #fff;
  border: 1px solid #ebebeb;
  border-radius: 20px;
  padding: 8px 8px 8px 16px;
  box-shadow: 0 1px 2px rgb(0 0 0 / 0.04);
}
.composer:focus-within { border-color: #3392ff; }
.composer textarea {
  flex: 1;
  border: none;
  outline: none;
  resize: none;
  background: transparent;
  font-family: inherit;
  font-size: 16px;
  line-height: 1.6;
  color: #0a0a0a;
  padding: 8px 0;
  max-height: 160px;
}
.composer textarea::placeholder { color: #a3a3a3; }
.composer .btn-primary { flex: 0 0 auto; padding: 10px 20px; }
.composer-note { margin: 8px 4px 0; font-size: 12px; color: #a3a3a3; text-align: center; }

@media (max-width: 640px) {
  .hero { padding-top: 28px; }
  .hero h1 { font-size: 24px; }
  .model-badge { display: none; }
  .brand-sub { display: none; }
  .bubble-user { max-width: 88%; }
  .composer-wrap { padding: 8px 12px 12px; }
}