* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: #f5f7fb;
  color: #111827;
}

.layout {
  display: flex;
  height: 100vh;
}

.sidebar {
  width: 260px;
  background: #0f172a;
  color: #e5e7eb;
  padding: 16px;
  border-right: 1px solid #1f2937;
}

.brand {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 12px;
}

.new-chat {
  width: 100%;
  border: 1px solid #334155;
  background: #111827;
  color: #e5e7eb;
  border-radius: 8px;
  padding: 10px 12px;
  cursor: pointer;
}

.new-chat.secondary {
  margin-top: 8px;
  background: #0b1220;
}

.new-chat.secondary.danger {
  background: #3b0b0b;
  border-color: #7f1d1d;
}

.session-list {
  margin-top: 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.session-item {
  background: #1f2937;
  border: 1px solid #374151;
  padding: 10px;
  border-radius: 8px;
  font-size: 13px;
}

.chat-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  max-width: 980px;
  margin: 0 auto;
  width: 100%;
}

.chat-header {
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  font-weight: 700;
}

.message-list {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
}

.message-row {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  margin-bottom: 10px;
}

.message-row.user {
  justify-content: flex-end;
}

.message-row.assistant {
  justify-content: flex-start;
}

.message-stack {
  display: flex;
  flex-direction: column;
}

.message-stack.user {
  align-items: flex-end;
}

.message-stack.assistant {
  align-items: flex-start;
}

.message-meta {
  font-size: 12px;
  color: #6b7280;
  margin-bottom: 4px;
  padding: 0 2px;
}

.avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
  flex-shrink: 0;
}

.avatar.user {
  background: #2563eb;
  color: #fff;
}

.avatar.assistant {
  background: #0f172a;
  color: #e5e7eb;
}

.message {
  width: auto;
  display: inline-block;
  max-width: min(80%, 720px);
  border-radius: 12px;
  padding: 12px;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-word;
  overflow-wrap: anywhere;
}

.message.single-line {
  white-space: nowrap;
  min-width: max-content;
}

.message-meta.user {
  text-align: right;
}

.message-meta.assistant {
  text-align: left;
}

.message.user {
  background: #2563eb;
  color: #fff;
}

.message.assistant {
  background: #fff;
  border: 1px solid #e5e7eb;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 12px;
  margin: 10px 0 16px;
}

.card {
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  padding: 12px;
}

.card h4 {
  margin: 0 0 6px;
  font-size: 16px;
}

.meta {
  font-size: 13px;
  color: #4b5563;
  margin: 4px 0;
}

.meta.dishes {
  color: #d97706;
  font-weight: 500;
  margin-top: 6px;
  padding-top: 5px;
  border-top: 1px dashed #fde68a;
}

.order-btn {
  margin-top: 8px;
  border: none;
  border-radius: 8px;
  background: #16a34a;
  color: #fff;
  padding: 8px 10px;
  font-size: 13px;
  cursor: pointer;
}

.order-btn:disabled {
  background: #9ca3af;
  cursor: not-allowed;
}

.chat-input-wrap {
  border-top: 1px solid #e5e7eb;
  background: #fff;
  padding: 14px;
  display: flex;
  gap: 10px;
}

#promptInput {
  flex: 1;
  min-height: 56px;
  resize: none;
  border: 1px solid #d1d5db;
  border-radius: 10px;
  padding: 10px;
  font-size: 14px;
}

#sendBtn {
  width: 90px;
  border: none;
  border-radius: 10px;
  background: #2563eb;
  color: #fff;
  font-size: 14px;
  cursor: pointer;
}

.pref-modal {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 999;
}

.hidden {
  display: none;
}

.pref-panel {
  width: min(640px, 92vw);
  background: #fff;
  border-radius: 14px;
  padding: 18px;
  border: 1px solid #e5e7eb;
}

.pref-panel h3 {
  margin: 0 0 14px;
}

.pref-question {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 10px;
}

.pref-options {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.pref-option {
  border: 1px solid #d1d5db;
  background: #f9fafb;
  border-radius: 10px;
  padding: 10px;
  cursor: pointer;
  text-align: left;
}

.pref-option.active {
  border-color: #2563eb;
  background: #eff6ff;
}

.pref-actions {
  margin-top: 14px;
  display: flex;
  justify-content: space-between;
}

.ghost-btn {
  border: 1px solid #d1d5db;
  border-radius: 10px;
  background: #fff;
  padding: 8px 12px;
  cursor: pointer;
}

.auth-input {
  width: 100%;
  border: 1px solid #d1d5db;
  border-radius: 10px;
  padding: 10px;
  font-size: 14px;
}

.toast {
  position: fixed;
  right: 18px;
  top: 18px;
  z-index: 1200;
  min-width: 220px;
  max-width: 420px;
  padding: 10px 12px;
  border-radius: 10px;
  color: #fff;
  background: #111827;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

.account-wrap {
  max-width: 900px;
  margin: 0 auto;
  width: 100%;
}

.account-main {
  max-width: none;
  margin: 0;
}

.account-card {
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  padding: 16px;
  margin-bottom: 14px;
}

.account-card h3 {
  margin: 0 0 10px;
  font-size: 18px;
}

.account-line {
  margin: 10px 0;
  color: #334155;
  font-size: 14px;
}

.account-form {
  display: grid;
  gap: 10px;
}

.account-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.mt12 {
  margin-top: 12px;
}

.primary-btn {
  border: none;
  border-radius: 10px;
  background: #2563eb;
  color: #fff;
  padding: 9px 14px;
  cursor: pointer;
}

.danger-btn {
  border: none;
  border-radius: 10px;
  background: #dc2626;
  color: #fff;
  padding: 9px 14px;
  cursor: pointer;
}

.question-list {
  display: grid;
  gap: 12px;
}

.question-card {
  border: 1px solid #e5e7eb;
  border-radius: 10px;
  padding: 10px;
  background: #f8fafc;
}

.question-title {
  margin-bottom: 8px;
  font-weight: 600;
}

.question-options {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.question-option {
  border: 1px solid #d1d5db;
  background: #fff;
  border-radius: 8px;
  padding: 8px;
  text-align: left;
  cursor: pointer;
}

.question-option.active {
  border-color: #2563eb;
  background: #eff6ff;
}

@media (max-width: 900px) {
  .account-main .chat-header {
    font-size: 22px;
  }
  .question-options {
    grid-template-columns: 1fr;
  }
}

.toast.success {
  background: #16a34a;
}

.toast.error {
  background: #dc2626;
}

.toast {
  position: fixed;
  right: 20px;
  top: 20px;
  z-index: 1200;
  background: #111827;
  color: #fff;
  border-radius: 10px;
  padding: 10px 14px;
  font-size: 13px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}