:root {
  --bg: #f3efe6;
  --panel: #fffaf0;
  --ink: #17212b;
  --muted: #6b7280;
  --accent: #264653;
  --user: #e9f5db;
  --bot: #ffffff;
  --border: #d9d2c3;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, sans-serif;
  background: radial-gradient(circle at top, #fefae0 0%, var(--bg) 55%, #ece7dc 100%);
  color: var(--ink);
}

.layout-shell {
  width: min(1280px, 96vw);
  margin: 18px auto;
  display: grid;
  grid-template-columns: minmax(300px, 380px) 1fr;
  gap: 14px;
  height: min(92vh, 920px);
}

.cart-panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  display: grid;
  grid-template-rows: auto 1fr auto;
  overflow: hidden;
}

.cart-header {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(120deg, #2a9d8f 0%, #8ecae6 100%);
}

.cart-header h2 {
  margin: 0;
  font-size: 1.1rem;
}

.cart-header p {
  margin: 4px 0 0;
  font-size: .9rem;
}

.cart-items {
  overflow: auto;
  padding: 10px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.cart-empty {
  border: 1px dashed #b6ad9b;
  border-radius: 10px;
  padding: 18px;
  text-align: center;
  color: var(--muted);
  background: #fff;
}

.cart-item {
  display: grid;
  grid-template-columns: 66px 1fr;
  gap: 10px;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px;
  background: #fff;
}

.cart-thumb {
  width: 66px;
  height: 66px;
  border-radius: 8px;
  object-fit: cover;
  background: #f5f5f5;
  border: 1px solid #e5e7eb;
}

.cart-item-body h3 {
  margin: 0;
  font-size: .9rem;
  line-height: 1.2;
}

.cart-item-body p {
  margin: 6px 0 0;
  font-size: .82rem;
  color: #1f2937;
}

.cart-line-total {
  font-weight: 700;
}

.cart-footer {
  border-top: 1px solid var(--border);
  padding: 10px 14px;
  background: #fff;
}

.cart-total-row {
  display: flex;
  justify-content: space-between;
  font-size: .95rem;
  margin: 4px 0;
}

.chat-shell {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
  display: grid;
  grid-template-rows: auto 1fr auto;
}

.chat-header {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(120deg, #f4a261 0%, #e9c46a 100%);
}

.chat-header h1 {
  margin: 0;
  font-size: 1.1rem;
}

.chat-header p {
  margin: 4px 0 0;
  color: #1f2937;
  font-size: .9rem;
}

.chat-log {
  overflow: auto;
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.msg {
  max-width: 85%;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  line-height: 1.35;
  white-space: pre-wrap;
}

.msg.user {
  align-self: flex-end;
  background: var(--user);
}

.msg.assistant {
  align-self: flex-start;
  background: var(--bot);
}

.msg.thinking {
  opacity: .75;
  font-style: italic;
  color: var(--muted);
}

.chat-input-row {
  border-top: 1px solid var(--border);
  padding: 12px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px;
}

.chat-input-row input {
  font-size: 1rem;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid #b6ad9b;
}

.chat-input-row button {
  border: 0;
  border-radius: 10px;
  background: var(--accent);
  color: white;
  font-weight: 600;
  padding: 10px 14px;
  cursor: pointer;
}

.chat-input-row button:disabled {
  opacity: .5;
  cursor: not-allowed;
}

@media (max-width: 980px) {
  .layout-shell {
    grid-template-columns: 1fr;
    height: auto;
  }

  .cart-panel,
  .chat-shell {
    min-height: 380px;
  }
}