* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --primary: #172450;
  --primary-light: #038ed1;
  --accent: #dfb025;
  --accent-bright: #fed607;
  --bg: #f5f5f5;
  --white: #ffffff;
  --text: #2c2c2c;
  --text-light: #666;
  --border: #ddd;
  --bubble-user: #172450;
  --bubble-assistant: #ffffff;
  --shadow: 0 2px 12px rgba(0,0,0,0.08);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.container {
  width: 720px;
  max-width: 100%;
  height: 90vh;
  min-width: 340px;
  min-height: 400px;
  max-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--white);
  box-shadow: var(--shadow);
  border-radius: 16px;
  overflow: hidden;
  resize: both;
}

/* Embedded in another site (/embed): the frame's whole area, no school picker */
body.embed {
  display: block;
}

.embed .container {
  width: 100%;
  height: 100vh;
  min-width: 0;
  max-height: none;
  border-radius: 0;
  box-shadow: none;
  resize: none;
}

.embed header {
  padding: 12px 16px 10px;
}

.embed .picker {
  display: none;
}

/* Header */
header {
  background: var(--primary);
  color: white;
  padding: 20px 24px 16px;
}

.header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 6px;
}

.logo-text {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.5px;
}

#lang-select {
  background: rgba(255,255,255,0.15);
  color: white;
  border: 1px solid rgba(255,255,255,0.3);
  border-radius: 8px;
  padding: 4px 8px;
  font-size: 13px;
  cursor: pointer;
  outline: none;
}

#lang-select option {
  background: var(--primary);
}

#school-input {
  width: 100%;
  margin: 6px 0 8px;
  background: rgba(255,255,255,0.15);
  color: white;
  border: 1px solid rgba(255,255,255,0.3);
  border-radius: 8px;
  padding: 6px 10px;
  font-size: 14px;
  outline: none;
}

#school-input::placeholder {
  color: rgba(255,255,255,0.7);
}

#school-input:focus {
  border-color: var(--accent);
}

/* School search: a list under the box; the whole screen on a phone */
.picker {
  position: relative;
}

#picker-cancel {
  display: none;
}

#school-list {
  position: absolute;
  top: calc(100% - 4px);
  left: 0;
  right: 0;
  z-index: 20;
  max-height: min(60vh, 420px);
  overflow-y: auto;
  list-style: none;
  padding: 4px 0;
  background: var(--white);
  color: var(--text);
  border-radius: 8px;
  box-shadow: 0 6px 24px rgba(0,0,0,0.18);
}

#school-list li {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 8px 12px;
  cursor: pointer;
}

#school-list li[aria-selected="true"] {
  background: #eaf2fb;
}

#school-list li[aria-disabled="true"],
#school-list li.empty {
  cursor: default;
  color: var(--text-light);
}

.option-name {
  font-size: 14px;
  font-weight: 600;
}

#school-list li.current .option-name::after {
  content: " ✓";
  color: var(--primary-light);
}

.option-detail {
  font-size: 12px;
  color: var(--text-light);
}

.tagline {
  font-size: 13px;
  opacity: 0.75;
}

/* School choices in a reply that asks which school is meant */
.choices {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 8px;
}

.choice {
  background: var(--white);
  color: var(--primary);
  border: 1px solid var(--primary);
  border-radius: 16px;
  padding: 6px 12px;
  font-size: 14px;
  cursor: pointer;
}

.choice:hover:not(:disabled) {
  background: var(--primary);
  color: white;
}

.choice:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Chat window */
.chat-window {
  flex: 1;
  overflow-y: auto;
  padding: 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  scroll-behavior: smooth;
}

.message {
  display: flex;
  max-width: 85%;
}

.message.user {
  align-self: flex-end;
  flex-direction: row-reverse;
}

.message.assistant {
  align-self: flex-start;
  flex-direction: column;
}

.bubble {
  padding: 12px 16px;
  border-radius: 16px;
  font-size: 14px;
  line-height: 1.6;
}

.message.user .bubble {
  white-space: pre-wrap;
}

.message.user .bubble {
  background: var(--bubble-user);
  color: white;
  border-bottom-right-radius: 4px;
}

.message.assistant .bubble {
  background: var(--bubble-assistant);
  border: 1px solid var(--border);
  border-bottom-left-radius: 4px;
  box-shadow: 0 1px 4px rgba(0,0,0,0.05);
}

/* Comparison tables scroll sideways instead of widening the bubble */
.bubble table {
  display: block;
  overflow-x: auto;
  border-collapse: collapse;
  margin: 8px 0;
}

.bubble th,
.bubble td {
  border: 1px solid var(--border);
  padding: 6px 10px;
  text-align: left;
  vertical-align: top;
}

.bubble th {
  background: var(--bg);
}

.sources {
  margin-top: 8px;
  font-size: 11px;
  color: var(--text-light);
}

.sources a {
  color: var(--primary);
  text-decoration: none;
  margin-right: 6px;
}

.sources a:hover {
  text-decoration: underline;
}

/* Under an answer: helpful / not helpful / copy, and the note after 👎 */
.actions,
.note {
  display: flex;
  gap: 6px;
  margin-top: 6px;
  font-size: 12px;
  color: var(--text-light);
}

.actions button,
.note button {
  background: none;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2px 10px;
  font-size: 12px;
  color: var(--text-light);
  cursor: pointer;
}

.actions button:hover:not(:disabled),
.note button:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.actions button:disabled {
  cursor: default;
  opacity: 0.4;
}

.actions button.chosen {
  opacity: 1;
  border-color: var(--primary);
}

.note input {
  flex: 1;
  min-width: 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 4px 8px;
  font-size: 12px;
}

/* Typing indicator */
.typing .bubble {
  display: flex;
  gap: 4px;
  align-items: center;
  padding: 14px 18px;
}

.dot {
  width: 7px;
  height: 7px;
  background: var(--text-light);
  border-radius: 50%;
  animation: bounce 1.2s infinite;
}

.dot:nth-child(2) { animation-delay: 0.2s; }
.dot:nth-child(3) { animation-delay: 0.4s; }

@keyframes bounce {
  0%, 80%, 100% { transform: translateY(0); }
  40% { transform: translateY(-6px); }
}

/* Input area */
.input-area {
  display: flex;
  align-items: flex-end;
  gap: 10px;
  padding: 16px 24px;
  border-top: 1px solid var(--border);
  background: var(--white);
}

#input {
  flex: 1;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px 14px;
  font-size: 14px;
  font-family: inherit;
  resize: none;
  outline: none;
  line-height: 1.5;
  max-height: 120px;
  overflow-y: auto;
  transition: border-color 0.2s;
}

#input:focus {
  border-color: var(--primary);
}

#send-btn {
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 12px;
  width: 42px;
  height: 42px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background 0.2s, opacity 0.2s;
}

#send-btn:hover {
  background: #038ed1;
}

#send-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Footer */
footer {
  padding: 10px 24px;
  border-top: 1px solid var(--border);
  background: #fafafa;
}

footer p {
  font-size: 11px;
  color: var(--text-light);
  text-align: center;
}

footer a {
  color: var(--primary);
  text-decoration: none;
}

/* Scrollbar */
.chat-window::-webkit-scrollbar { width: 4px; }
.chat-window::-webkit-scrollbar-track { background: transparent; }
.chat-window::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

/* Markdown content in assistant bubbles */
.message.assistant .bubble h1,
.message.assistant .bubble h2,
.message.assistant .bubble h3 {
  margin-top: 12px;
  margin-bottom: 6px;
  line-height: 1.3;
}

.message.assistant .bubble h1 { font-size: 16px; }
.message.assistant .bubble h2 { font-size: 15px; }
.message.assistant .bubble h3 { font-size: 14px; }

.message.assistant .bubble h1:first-child,
.message.assistant .bubble h2:first-child,
.message.assistant .bubble h3:first-child {
  margin-top: 0;
}

.message.assistant .bubble p {
  margin: 6px 0;
}

.message.assistant .bubble p:first-child {
  margin-top: 0;
}

.message.assistant .bubble p:last-child {
  margin-bottom: 0;
}

.message.assistant .bubble ul,
.message.assistant .bubble ol {
  margin: 6px 0;
  padding-left: 20px;
}

.message.assistant .bubble li {
  margin: 3px 0;
}

.message.assistant .bubble li > ul,
.message.assistant .bubble li > ol {
  margin: 2px 0;
}

.message.assistant .bubble strong {
  font-weight: 600;
  color: var(--primary);
}

.message.assistant .bubble a {
  color: var(--primary-light);
  text-decoration: underline;
}

.message.assistant .bubble hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 10px 0;
}

.message.assistant .bubble code {
  background: #f0f0f0;
  padding: 1px 5px;
  border-radius: 4px;
  font-size: 13px;
}

.message.assistant .bubble table {
  border-collapse: collapse;
  margin: 8px 0;
  font-size: 13px;
  width: 100%;
}

.message.assistant .bubble th,
.message.assistant .bubble td {
  border: 1px solid var(--border);
  padding: 5px 8px;
  text-align: left;
}

.message.assistant .bubble th {
  background: #f5f5f5;
  font-weight: 600;
}

.source-tag {
  display: inline;
  font-size: 11px;
}

/* Tablet */
@media (max-width: 768px) {
  .container {
    width: 100%;
    max-width: 100%;
    max-height: 100vh;
    height: 100vh;
    border-radius: 0;
    resize: none;
  }
  .message { max-width: 90%; }
}

/* Mobile */
@media (max-width: 480px) {
  body { align-items: stretch; }
  .container {
    border-radius: 0;
    max-height: 100vh;
    height: 100dvh; /* dynamic viewport height, avoids keyboard overlap */
  }
  header { padding: 14px 16px 12px; }
  .logo-text { font-size: 20px; }
  .tagline { font-size: 12px; }
  .chat-window { padding: 12px 14px; gap: 12px; }
  .message { max-width: 92%; }
  .bubble { padding: 10px 14px; font-size: 14px; }
  .input-area { padding: 10px 12px; gap: 8px; }
  #input { padding: 10px 12px; font-size: 16px; /* 16px prevents iOS auto-zoom on focus */ }
  .note input { font-size: 16px; }
  #send-btn { width: 40px; height: 40px; }

  /* Tables scroll horizontally on mobile */
  .message.assistant .bubble table {
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
  .message.assistant .bubble h2 { font-size: 14px; }
  .message.assistant .bubble h3 { font-size: 13px; }
  footer { padding: 8px 14px; }
  footer p { font-size: 10px; }

  .picker.open {
    position: fixed;
    inset: 0;
    z-index: 50;
    display: flex;
    flex-wrap: wrap;
    align-content: flex-start;
    gap: 10px;
    padding: 14px 16px;
    background: var(--primary);
  }
  .picker.open #school-input { flex: 1; margin: 0; padding: 10px 12px; font-size: 16px; }
  .picker.open #picker-cancel {
    display: block;
    background: none;
    border: none;
    color: white;
    font-size: 15px;
  }
  .picker.open #school-list {
    position: static;
    flex-basis: 100%;
    max-height: calc(100dvh - 80px);
  }
  #school-list li { padding: 12px 14px; }
  .option-name { font-size: 15px; }
}