:root {
  --paper: #faf6f1;
  --ink: #2b2420;
  --ink-soft: #6b6058;
  --plum: #7d3c4a;
  --plum-deep: #5e2c37;
  --sage: #8b9a7c;
  --line: #e8ded2;
  --white: #fffdfa;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Pretendard", -apple-system, "Malgun Gothic", sans-serif;
  min-height: 100vh;
}

.spine {
  position: fixed;
  top: 0;
  left: 0;
  width: 10px;
  height: 100%;
  background: linear-gradient(180deg, var(--plum) 0%, var(--plum-deep) 100%);
  z-index: 5;
}

.page {
  max-width: 640px;
  margin: 0 auto;
  padding: 0 20px 24px 30px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.header {
  padding: 36px 0 20px;
  border-bottom: 1px solid var(--line);
}

.header h1 {
  font-family: "Noto Serif KR", serif;
  font-weight: 700;
  font-size: 28px;
  margin: 0 0 6px;
  color: var(--plum-deep);
}

.school-name {
  margin: 0;
  font-size: 14px;
  color: var(--ink-soft);
}

.chat-wrap {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding-top: 20px;
}

.log {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding-bottom: 16px;
}

.bubble {
  max-width: 82%;
  padding: 12px 16px;
  border-radius: 3px;
  line-height: 1.55;
  font-size: 15px;
  white-space: pre-wrap;
}

.bubble p { margin: 0; }
.bubble p + p { margin-top: 8px; }

.bubble.bot {
  align-self: flex-start;
  background: var(--white);
  border-left: 3px solid var(--sage);
  color: var(--ink);
}

.bubble.user {
  align-self: flex-end;
  background: var(--plum);
  color: var(--white);
  border-radius: 3px;
}

.bubble.error {
  align-self: flex-start;
  background: #fff4f0;
  border-left: 3px solid #b5473f;
  color: #6f2b25;
}

.bubble.loading {
  align-self: flex-start;
  background: var(--white);
  border-left: 3px solid var(--line);
  color: var(--ink-soft);
  font-style: normal;
}

.starters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 4px 0 8px;
}

.chip {
  border: 1px solid var(--line);
  background: var(--white);
  color: var(--ink-soft);
  font-family: inherit;
  font-size: 13px;
  padding: 8px 12px;
  border-radius: 3px;
  cursor: pointer;
  transition: border-color 0.15s ease, color 0.15s ease;
}

.chip:hover {
  border-color: var(--plum);
  color: var(--plum-deep);
}

.input-row {
  display: flex;
  gap: 8px;
  align-items: flex-end;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  position: sticky;
  bottom: 0;
  background: var(--paper);
}

#input {
  flex: 1;
  resize: none;
  font-family: inherit;
  font-size: 15px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: var(--white);
  color: var(--ink);
  max-height: 120px;
}

#input:focus {
  outline: none;
  border-color: var(--plum);
}

#send {
  font-family: inherit;
  font-size: 15px;
  font-weight: 600;
  padding: 12px 18px;
  background: var(--plum);
  color: var(--white);
  border: none;
  border-radius: 3px;
  cursor: pointer;
  transition: background 0.15s ease;
}

#send:hover { background: var(--plum-deep); }
#send:disabled { background: var(--line); color: var(--ink-soft); cursor: not-allowed; }

.disclaimer {
  font-size: 12px;
  color: var(--ink-soft);
  text-align: center;
  margin: 10px 0 0;
}

@media (max-width: 480px) {
  .page { padding: 0 14px 16px 22px; }
  .header { padding-top: 24px; }
  .bubble { max-width: 90%; }
}