/* Apple 디자인 시스템 기반 (토큰 출처: web/DESIGN.md — apple.com 검증 값)
   - 색: primary #0071e3(채움 액션), link #0066cc(링크·아웃라인), canvas #f5f5f7, surface #fff
   - 타이포: SF Pro(시스템 폰트로 로드), body 17/25, body-small 14/18, caption 12/16
   - 컨트롤: 980px 필(대형 44px·컴팩트 36px), 카드 18px, 컨트롤 8px
   - 깊이: 그림자 토큰 없음(플랫) — 구분은 배경 대비와 헤어라인으로
   호버·포커스 상태는 캡처에 없어 로컬 확장으로 정의한다. */
:root {
  --canvas: #f5f5f7;
  --surface: #ffffff;
  --ink: #1d1d1f;
  --muted: #6e6e73;
  --secondary: #515154;
  --primary: #0071e3;
  --on-primary: #ffffff;
  --link: #0066cc;
  --line: #d2d2d7;            /* 헤어라인 — 토큰 외 로컬 확장 (apple.com 계열 중성색) */
  --code-bg: #f5f5f7;
  --pill: 980px;
  --radius-card: 18px;
  --radius-control: 8px;
  --error: #d70015;           /* 로컬 확장 — 오류 표시용 */
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--canvas); color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display",
    "Apple SD Gothic Neo", "Pretendard", "Segoe UI", sans-serif;
  font-size: 17px; line-height: 25px; letter-spacing: -0.374px;  /* body 토큰 */
  -webkit-font-smoothing: antialiased;
}
.layout { max-width: 1080px; margin: 0 auto; display: flex; gap: 8px; align-items: flex-start; }
.app { flex: 1; min-width: 0; max-width: 780px; margin: 0 auto; min-height: 100dvh; display: flex; flex-direction: column; }

/* 자주 쓰는 질문 — 데스크톱: 좌측 고정 패널, 모바일: 상단 가로 스크롤 칩 */
.prompts {
  width: 240px; flex-shrink: 0; position: sticky; top: 0;
  max-height: 100dvh; overflow-y: auto;
  padding: 64px 0 20px 20px; display: flex; flex-direction: column; gap: 8px;
}
.prompts h2 {
  margin: 0 0 4px; font-size: 12px; line-height: 16px; letter-spacing: -0.12px;
  font-weight: 600; color: var(--muted);
}
.prompt {
  text-align: left; background: var(--surface); border: 1px solid transparent;
  border-radius: 12px; padding: 10px 13px;
  font-size: 14px; line-height: 19px; letter-spacing: -0.224px; font-weight: 400;
  color: var(--secondary); cursor: pointer;
}
.prompt:hover { border-color: var(--line); color: var(--ink); }

/* 모바일 헤더: 모델 ID 메타는 공간만 차지하므로 숨긴다 — 버튼이 밀려나지 않게 */
@media (max-width: 640px) {
  header { gap: 8px; }
  header .meta { display: none; }
}

@media (max-width: 900px) {
  .layout { display: block; }
  .prompts {
    width: auto; position: static; max-height: none;
    flex-direction: row; overflow-x: auto; gap: 8px;
    padding: 10px 20px 0; -webkit-overflow-scrolling: touch;
  }
  .prompts h2 { display: none; }
  .prompt { flex-shrink: 0; max-width: 260px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; border-radius: var(--pill); }
}

header {
  display: flex; align-items: center; gap: 12px; padding: 16px 20px 12px;
  position: sticky; top: 0; z-index: 5;
  background: color-mix(in srgb, var(--canvas) 78%, transparent);
  -webkit-backdrop-filter: saturate(180%) blur(20px); backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--line);
}
header h1 { font-size: 19px; font-weight: 600; letter-spacing: -0.2px; margin: 0; white-space: nowrap; }
header .meta {
  font-size: 12px; line-height: 16px; letter-spacing: -0.12px; color: var(--muted);
  min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;  /* 좁으면 말줄임 */
}
/* marketing-compact 기하의 아웃라인 변형: 36px 필, 8px 15px, 14px/400 */
header button {
  border: 1px solid var(--line); background: transparent; color: var(--secondary);
  border-radius: var(--pill); padding: 8px 15px; height: 36px; white-space: nowrap; flex-shrink: 0;
  font-size: 14px; font-weight: 400; letter-spacing: -0.224px; cursor: pointer;
}
header button:hover { border-color: var(--secondary); color: var(--ink); }
header #reset { margin-left: auto; }

.hidden { display: none !important; }

.login {
  position: fixed; inset: 0; z-index: 100; background: var(--canvas);
  display: flex; align-items: center; justify-content: center; padding: 20px;
}
.login-card {
  width: 100%; max-width: 360px; background: var(--surface);
  border-radius: var(--radius-card); padding: 36px 32px;
  display: flex; flex-direction: column; gap: 12px;
}
.login-card h2 { margin: 0; font-size: 28px; line-height: 32px; font-weight: 600; letter-spacing: 0.196px; }
.login-card p { margin: 0 0 8px; font-size: 14px; line-height: 18px; letter-spacing: -0.224px; color: var(--muted); }
.login-card input {
  border: 1px solid var(--line); border-radius: var(--radius-control); padding: 12px 14px;
  font-size: 17px; letter-spacing: -0.374px; background: var(--surface); color: var(--ink); outline: none;
}
.login-card input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary) 25%, transparent); }
/* marketing-primary: #0071e3 채움, 44px 필, 11px 21px, 17px/400 */
.login-card button {
  margin-top: 8px; border: none; background: var(--primary); color: var(--on-primary);
  border-radius: var(--pill); padding: 11px 21px; height: 44px;
  font-size: 17px; font-weight: 400; letter-spacing: -0.374px; cursor: pointer;
}
.login-card button:hover { background: color-mix(in srgb, var(--primary) 90%, #ffffff); }
.login-error { min-height: 18px; font-size: 12px; line-height: 16px; color: var(--error); }

#chat { flex: 1; padding: 16px 20px 20px; display: flex; flex-direction: column; gap: 16px; }
.msg { max-width: 100%; }
.msg.user { align-self: flex-end; max-width: 78%; }
.msg.user .who { text-align: right; }
.msg.user .bubble { width: fit-content; margin-left: auto; }
.msg .who { font-size: 12px; line-height: 16px; letter-spacing: -0.12px; color: var(--muted); margin-bottom: 5px; }
.bubble {
  background: var(--surface); border-radius: var(--radius-card);
  padding: 13px 17px; font-size: 17px; line-height: 25px; letter-spacing: -0.374px;
  overflow-x: auto;
}
.msg.user .bubble { background: var(--primary); color: var(--on-primary); }
.bubble :is(h1, h2, h3) { font-size: 1.02em; font-weight: 600; margin: 0.8em 0 0.3em; }
.bubble p { margin: 0.4em 0; }
.bubble pre { background: var(--code-bg); padding: 12px; border-radius: var(--radius-control); overflow-x: auto; font-size: 14px; line-height: 1.5; letter-spacing: 0; }
.bubble code { background: var(--code-bg); border-radius: 4px; padding: 1px 5px; font-size: 0.88em; letter-spacing: 0; }
.bubble pre code { background: none; padding: 0; }
.bubble table { border-collapse: collapse; margin: 0.5em 0; font-size: 14px; line-height: 18px; letter-spacing: -0.224px; }
.bubble th, .bubble td { border: 1px solid var(--line); padding: 5px 10px; }
.bubble a { color: var(--link); }
.msg.user .bubble a { color: #cfe4ff; }

details.logs { margin-bottom: 8px; font-size: 12px; line-height: 16px; letter-spacing: -0.12px; color: var(--muted); }
details.logs summary { cursor: pointer; user-select: none; }
details.logs div { font-family: ui-monospace, "SF Mono", Menlo, monospace; letter-spacing: 0; padding: 2px 0 2px 14px; word-break: break-all; }

.error .bubble { background: var(--surface); border: 1px solid var(--error); color: var(--error); }

.typing { color: var(--muted); font-size: 14px; line-height: 18px; letter-spacing: -0.224px; padding-left: 2px; }
.typing::after { content: "…"; animation: dots 1.2s infinite; }
@keyframes dots { 0% { content: "…"; } 33% { content: "·"; } 66% { content: "··"; } }
@media (prefers-reduced-motion: reduce) { .typing::after { animation: none; } }

form {
  position: sticky; bottom: 0; padding: 12px 20px 20px;
  background: color-mix(in srgb, var(--canvas) 78%, transparent);
  -webkit-backdrop-filter: saturate(180%) blur(20px); backdrop-filter: saturate(180%) blur(20px);
  display: flex; gap: 8px;
}
form input {
  flex: 1; border: 1px solid var(--line); border-radius: var(--pill); padding: 11px 21px;
  height: 44px; font-size: 17px; letter-spacing: -0.374px;
  background: var(--surface); color: var(--ink); outline: none;
}
form input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary) 25%, transparent); }
/* marketing-primary 대형 필과 동일 기하 */
form button {
  border: none; background: var(--primary); color: var(--on-primary);
  border-radius: var(--pill); padding: 11px 21px; height: 44px;
  font-size: 17px; font-weight: 400; letter-spacing: -0.374px; cursor: pointer;
}
form button:hover { background: color-mix(in srgb, var(--primary) 90%, #ffffff); }
form button:disabled { opacity: 0.4; cursor: default; }