/* 답변집 — 깔끔한 잎(연두) 테마 + 좌측 대화 목록.
   Spectral(디스플레이) + Pretendard(본문·한국어). */

:root {
  --paper: #f8f7f2;
  --paper-2: #f2f1ea;
  --card: #ffffff;
  --ink: #23261e;
  --muted: #747869;
  --line: #e7e6dc;
  --accent: #6f9a3f;
  --accent-soft: #6f9a3f12;
  --accent-ink: #4e7228;
  --user-bg: #eef1e6;
  --danger: #b1553a;
  --shadow: 0 1px 2px #1a1c1508, 0 10px 30px -22px #1a1c151f;
  --serif: "Spectral", ui-serif, Georgia, serif;
  --sans: "Pretendard Variable", Pretendard, -apple-system, system-ui, sans-serif;
}
:root[data-theme="dark"] {
  --paper: #14160f;
  --paper-2: #0e100a;
  --card: #1c1e15;
  --ink: #e9ebdd;
  --muted: #9aa088;
  --line: #2c2f22;
  --accent: #a7d474;
  --accent-soft: #a7d47418;
  --accent-ink: #c1e298;
  --user-bg: #22261a;
  --danger: #dd8b6f;
  --shadow: 0 1px 2px #0006, 0 18px 40px -24px #0009;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: var(--sans);
  color: var(--ink);
  background: linear-gradient(var(--paper), var(--paper-2));
  -webkit-font-smoothing: antialiased;
  line-height: 1.6;
  overflow: hidden;
}

.grain {
  position: fixed; inset: 0; z-index: 0; pointer-events: none; opacity: 0.24;
  mix-blend-mode: soft-light;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.5'/%3E%3C/svg%3E");
}

.app { position: relative; z-index: 1; display: flex; height: 100dvh; overflow: hidden; }

/* ── 좌측 사이드바 ── */
.sidebar {
  width: 268px; flex: none; display: flex; flex-direction: column;
  border-right: 1px solid var(--line);
  background: color-mix(in srgb, var(--card) 55%, var(--paper));
}
.sidebar__top { padding: 16px 14px 10px; }
.wordmark {
  display: block; font-family: var(--serif); font-weight: 600; font-size: 1.3rem;
  letter-spacing: -0.01em; padding: 4px 6px 12px;
}
.newchat {
  width: 100%; font-family: var(--sans); font-size: 0.9rem; cursor: pointer;
  padding: 10px 14px; border-radius: 11px; border: 1px solid var(--line);
  background: var(--card); color: var(--ink); text-align: left; transition: all .16s ease;
}
.newchat:hover { border-color: var(--accent); color: var(--accent-ink); }

.sessions { flex: 1; overflow-y: auto; padding: 6px 8px; display: flex; flex-direction: column; gap: 2px; }
.session {
  display: block; width: 100%; text-align: left; cursor: pointer;
  font-family: var(--sans); font-size: 0.88rem; color: var(--muted);
  border: none; background: transparent; border-radius: 9px; padding: 9px 11px;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis; transition: all .14s ease;
}
.session:hover { background: var(--accent-soft); color: var(--ink); }
.session.active { background: var(--accent-soft); color: var(--accent-ink); font-weight: 500; }
.sessions__empty { color: var(--muted); font-size: 0.82rem; padding: 12px; }
.sidebar__foot { color: var(--muted); font-size: 0.72rem; padding: 12px 16px; border-top: 1px solid var(--line); margin: 0; }

/* ── 우측 본체 ── */
.main { flex: 1; min-width: 0; display: flex; flex-direction: column; height: 100%; }

.topbar {
  flex: none; display: flex; align-items: center; gap: 12px;
  padding: 12px clamp(14px, 3vw, 28px);
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--paper) 80%, transparent);
  backdrop-filter: blur(8px);
}
.hamb {
  display: none; width: 36px; height: 36px; border-radius: 9px; cursor: pointer;
  border: 1px solid var(--line); background: var(--card); color: var(--ink); font-size: 1rem;
}
.topbar__title {
  flex: 1; min-width: 0; color: var(--muted); font-size: 0.9rem;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.controls { display: flex; align-items: center; gap: 10px; margin-left: auto; }
#model {
  font-family: var(--sans); font-size: 0.86rem; color: var(--ink);
  background: var(--card); border: 1px solid var(--line); border-radius: 999px;
  padding: 7px 30px 7px 14px; cursor: pointer; appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='none' stroke='%23747869' stroke-width='2'%3E%3Cpath d='M2 4l4 4 4-4'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 12px center;
}
.icon-btn {
  width: 36px; height: 36px; display: grid; place-items: center; cursor: pointer;
  border: 1px solid var(--line); background: var(--card); border-radius: 999px; transition: all .18s ease;
}
.icon-btn:hover { border-color: var(--accent); }
.theme-dot {
  width: 15px; height: 15px; border-radius: 50%;
  background: conic-gradient(from 200deg, var(--accent), var(--ink));
  box-shadow: inset 0 0 0 2px var(--card);
}

/* ── 대화 영역 (내부 스크롤) ── */
.stage {
  flex: 1; overflow-y: auto;
  padding: clamp(18px, 3vw, 36px) clamp(14px, 4vw, 28px) 24px;
}
.stage > .intro, .stage > .thread { max-width: 760px; margin: 0 auto; }

.intro { padding: clamp(28px, 10vh, 90px) 2px; animation: rise .6s ease both; }
.intro__title {
  font-family: var(--serif); font-weight: 500; font-size: clamp(1.6rem, 4vw, 2.2rem);
  letter-spacing: -0.015em; margin: 0 0 22px;
}
.suggestions { display: flex; flex-wrap: wrap; gap: 10px; }
.suggestions button {
  font-family: var(--sans); font-size: 0.88rem; color: var(--ink);
  background: var(--card); border: 1px solid var(--line); border-radius: 12px;
  padding: 11px 15px; cursor: pointer; transition: all .18s ease; box-shadow: var(--shadow);
}
.suggestions button:hover { border-color: var(--accent); color: var(--accent-ink); transform: translateY(-1px); }

.thread { display: flex; flex-direction: column; gap: 26px; padding-bottom: 10px; }
.msg { animation: rise .4s ease both; }
.msg.user { align-self: flex-end; max-width: 88%; }
.msg.user .bubble {
  background: var(--user-bg); border: 1px solid var(--line);
  padding: 12px 16px; border-radius: 16px 16px 4px 16px; font-size: 0.98rem;
  white-space: pre-wrap; word-break: break-word;
}
.msg.assistant { align-self: stretch; }
.msg.assistant .who {
  display: flex; align-items: center; gap: 8px; margin-bottom: 8px;
  font-size: 0.74rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted);
}
.msg.assistant .who::before {
  content: ""; width: 7px; height: 7px; border-radius: 50%;
  background: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft);
}

.tools { display: flex; flex-wrap: wrap; gap: 7px; margin-bottom: 12px; }
.tool-chip {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 0.76rem; color: var(--muted); background: var(--accent-soft);
  border: 1px solid var(--line); border-radius: 999px; padding: 4px 11px; animation: rise .3s ease both;
}
.tool-chip b { color: var(--accent-ink); font-weight: 600; }
.tool-chip.search::before { content: "⌕"; }
.tool-chip.read::before { content: "▤"; font-size: .7rem; }

.answer { font-size: 1.02rem; }
.answer p { margin: 0 0 0.85em; }
.answer h2, .answer h3 { font-family: var(--serif); font-weight: 600; letter-spacing: -0.01em; margin: 1.1em 0 0.5em; }
.answer h2 { font-size: 1.22rem; }
.answer h3 { font-size: 1.08rem; }
.answer ul, .answer ol { margin: 0 0 0.85em; padding-left: 1.3em; }
.answer li { margin: 0.25em 0; }
.answer a { color: var(--accent-ink); text-underline-offset: 3px; text-decoration-color: var(--line); }
.answer code { font-family: ui-monospace, SFMono-Regular, monospace; font-size: 0.88em; background: var(--accent-soft); padding: 1px 6px; border-radius: 6px; }
.answer strong { font-weight: 600; }
.cursor { display: inline-block; width: 8px; height: 1.05em; vertical-align: -2px; background: var(--accent); margin-left: 2px; animation: blink 1s steps(2) infinite; }

.sources { margin-top: 16px; padding-top: 14px; border-top: 1px dashed var(--line); }
.sources__cap { font-size: 0.72rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); margin-bottom: 8px; }
.sources__list { display: flex; flex-wrap: wrap; gap: 8px; }
.source {
  display: inline-flex; align-items: center; gap: 7px; text-decoration: none;
  font-size: 0.84rem; color: var(--ink); background: var(--card);
  border: 1px solid var(--line); border-radius: 10px; padding: 7px 12px; transition: all .16s ease;
}
.source::before { content: "§"; color: var(--accent); font-weight: 600; }
.source:hover { border-color: var(--accent); transform: translateY(-1px); }

.feedback { display: flex; align-items: center; gap: 10px; margin-top: 14px; }
.fb-flag {
  cursor: pointer; font-family: var(--sans); font-size: 0.82rem; color: var(--muted);
  border: 1px solid var(--line); background: var(--card); padding: 6px 13px;
  border-radius: 999px; transition: all .16s ease;
}
.fb-flag::before { content: "⚑ "; }
.fb-flag:hover { border-color: var(--danger); color: var(--danger); }
.fb-flag.active { border-color: var(--danger); color: var(--danger); background: color-mix(in srgb, var(--danger) 8%, transparent); }
.fb-flag:disabled { opacity: 0.6; cursor: default; }
.fb-hint { font-size: 0.8rem; color: var(--muted); }
.fb-form { display: flex; gap: 8px; margin-top: 10px; width: 100%; }
.fb-form textarea { flex: 1; font-family: var(--sans); font-size: 0.9rem; color: var(--ink); background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 9px 12px; resize: vertical; min-height: 42px; }
.fb-form button { font-family: var(--sans); font-size: 0.86rem; cursor: pointer; padding: 0 16px; background: var(--accent); color: #fff; border: none; border-radius: 10px; }
:root[data-theme="dark"] .fb-form button { color: #10120e; }
.error-note { color: var(--danger); font-size: 0.92rem; margin-top: 6px; }

/* ── 입력창 ── */
.composer-wrap { flex: none; padding: 10px clamp(14px, 4vw, 28px) 14px; background: linear-gradient(transparent, var(--paper) 30%); }
.composer {
  display: flex; align-items: flex-end; gap: 10px; max-width: 760px; margin: 0 auto;
  background: var(--card); border: 1px solid var(--line); border-radius: 18px;
  padding: 10px 10px 10px 16px; box-shadow: var(--shadow); transition: border-color .18s ease;
}
.composer:focus-within { border-color: var(--accent); }
#input { flex: 1; font-family: var(--sans); font-size: 1rem; color: var(--ink); background: transparent; border: none; outline: none; resize: none; max-height: 38vh; line-height: 1.5; padding: 6px 0; }
.send-btn { flex: none; width: 40px; height: 40px; border-radius: 12px; cursor: pointer; border: none; background: var(--accent); color: #fff; display: grid; place-items: center; transition: transform .16s ease, opacity .16s ease; }
:root[data-theme="dark"] .send-btn { color: #10120e; }
.send-btn:hover { transform: translateY(-1px); }
.send-btn:disabled { opacity: 0.4; cursor: default; transform: none; }
.composer__note { max-width: 760px; margin: 8px auto 0; text-align: center; font-size: 0.75rem; color: var(--muted); }

.scrim { display: none; position: fixed; inset: 0; z-index: 15; background: #0006; border: none; }

@keyframes rise { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }
@keyframes blink { 50% { opacity: 0; } }
@media (prefers-reduced-motion: reduce) { * { animation: none !important; } }

/* ── 모바일: 사이드바 오프캔버스 ── */
@media (max-width: 820px) {
  .hamb { display: grid; place-items: center; }
  .sidebar {
    position: fixed; left: 0; top: 0; bottom: 0; z-index: 20; width: 82vw; max-width: 300px;
    transform: translateX(-100%); transition: transform .22s ease; box-shadow: var(--shadow);
  }
  .app.nav-open .sidebar { transform: none; }
  .app.nav-open .scrim { display: block; }
}