/* cc-chat — Claude design aesthetic, responsive PC + mobile */
:root {
  --bg: #f0eee6;
  --bg-sidebar: #e9e6da;
  --bg-input: #ffffff;
  --bg-user: #ffffff;
  --bg-elev: #f7f5ef;
  --border: #dcd8ca;
  --text: #23221e;
  --text-soft: #6b6658;
  --accent: #d97757;
  --accent-hover: #c56646;
  --accent-soft: #f3e3db;
  --code-bg: #2b2926;
  --code-text: #e8e5dc;
  --danger: #b3452f;
  --shadow: 0 1px 3px rgba(40, 35, 25, 0.08);
  --serif: "Iowan Old Style", "Palatino Linotype", Georgia, "Times New Roman", serif;
  --sans: ui-sans-serif, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #262421;
    --bg-sidebar: #1f1d1b;
    --bg-input: #302d29;
    --bg-user: #34302b;
    --bg-elev: #2e2b27;
    --border: #413d37;
    --text: #ece9e1;
    --text-soft: #a29b8c;
    --accent: #e08a6c;
    --accent-hover: #ec9a7d;
    --accent-soft: #3a2f28;
    --code-bg: #161513;
    --code-text: #e8e5dc;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
  }
}

* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  overflow: hidden;
}
button { font-family: inherit; cursor: pointer; }
input, textarea { font-family: inherit; }

/* ---------- Login ---------- */
#login {
  position: fixed; inset: 0; display: flex; align-items: center; justify-content: center;
  background: var(--bg); z-index: 50; padding: 24px;
}
.login-card {
  width: 100%; max-width: 360px; text-align: center;
}
.login-card .logo { font-size: 40px; margin-bottom: 8px; }
.login-card h1 { font-family: var(--serif); font-weight: 500; font-size: 26px; margin: 0 0 4px; }
.login-card p { color: var(--text-soft); margin: 0 0 24px; font-size: 14px; }
.login-card input {
  width: 100%; padding: 13px 15px; border: 1px solid var(--border); border-radius: 12px;
  background: var(--bg-input); color: var(--text); font-size: 16px; margin-bottom: 12px;
}
.login-card input:focus { outline: none; border-color: var(--accent); }
.btn-primary {
  width: 100%; padding: 13px; border: none; border-radius: 12px;
  background: var(--accent); color: #fff; font-size: 15px; font-weight: 600;
  transition: background .15s;
}
.btn-primary:hover { background: var(--accent-hover); }
.btn-primary:disabled { opacity: .55; cursor: default; }
.login-err { color: var(--danger); font-size: 13px; min-height: 18px; margin-top: 10px; }

/* ---------- Layout ---------- */
#app { display: none; height: 100%; }
#app.visible { display: flex; }

#sidebar {
  width: 280px; flex-shrink: 0; background: var(--bg-sidebar);
  border-right: 1px solid var(--border); display: flex; flex-direction: column;
  transition: transform .25s ease;
}
.sidebar-head { padding: 16px 14px 10px; }
.brand { font-family: var(--serif); font-size: 20px; font-weight: 500; display: flex; align-items: center; gap: 8px; }
.brand .dot { width: 10px; height: 10px; border-radius: 50%; background: var(--accent); }
.new-btn {
  width: 100%; margin-top: 14px; padding: 11px 14px; border: 1px solid var(--border);
  border-radius: 11px; background: var(--bg-input); color: var(--text); font-weight: 600;
  display: flex; align-items: center; gap: 8px; justify-content: center; font-size: 14px;
}
.new-btn:hover { border-color: var(--accent); color: var(--accent); }
.conv-list { flex: 1; overflow-y: auto; padding: 8px; }
.conv-item {
  padding: 10px 12px; border-radius: 9px; cursor: pointer; font-size: 14px;
  color: var(--text-soft); display: flex; align-items: center; justify-content: space-between;
  gap: 6px; white-space: nowrap; overflow: hidden;
}
.conv-item:hover { background: var(--bg-elev); color: var(--text); }
.conv-item.active { background: var(--accent-soft); color: var(--text); }
.conv-item .t { overflow: hidden; text-overflow: ellipsis; flex: 1; }
.conv-item .del { opacity: 0; border: none; background: none; color: var(--text-soft); font-size: 16px; padding: 0 2px; }
.conv-item:hover .del { opacity: .7; }
.conv-item .del:hover { color: var(--danger); opacity: 1; }
.sidebar-foot { padding: 12px 14px; border-top: 1px solid var(--border); font-size: 12px; color: var(--text-soft); display: flex; justify-content: space-between; align-items: center; }
.sidebar-foot button { border: none; background: none; color: var(--text-soft); font-size: 12px; }
.sidebar-foot button:hover { color: var(--accent); }

/* ---------- Main ---------- */
#main { flex: 1; display: flex; flex-direction: column; min-width: 0; }
.topbar {
  display: flex; align-items: center; gap: 10px; padding: 12px 18px;
  border-bottom: 1px solid var(--border); background: var(--bg);
}
.topbar .title { font-family: var(--serif); font-size: 17px; flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.hamburger { display: none; border: none; background: none; font-size: 22px; color: var(--text); padding: 2px 6px; }

.model-toggle { display: inline-flex; background: var(--bg-elev); border: 1px solid var(--border); border-radius: 999px; padding: 3px; }
.model-toggle button {
  border: none; background: none; padding: 5px 13px; border-radius: 999px; font-size: 13px;
  font-weight: 600; color: var(--text-soft);
}
.model-toggle button.on { background: var(--accent); color: #fff; }

.messages { flex: 1; overflow-y: auto; padding: 24px 0 12px; }
.mwrap { max-width: 760px; margin: 0 auto; padding: 0 20px; }
.empty-state { text-align: center; color: var(--text-soft); margin-top: 14vh; }
.empty-state .big { font-family: var(--serif); font-size: 30px; color: var(--text); margin-bottom: 8px; }

.msg { margin-bottom: 22px; }
.msg .role { font-size: 12px; font-weight: 700; letter-spacing: .04em; text-transform: uppercase; color: var(--text-soft); margin-bottom: 6px; display: flex; align-items: center; gap: 7px; }
.msg.user .role { color: var(--accent); }
.msg.user .bubble { background: var(--bg-user); border: 1px solid var(--border); border-radius: 14px; padding: 12px 16px; box-shadow: var(--shadow); }
.bubble { word-wrap: break-word; overflow-wrap: anywhere; }
.bubble p { margin: 0 0 12px; }
.bubble p:last-child { margin-bottom: 0; }
.bubble h1, .bubble h2, .bubble h3 { font-family: var(--serif); font-weight: 600; line-height: 1.3; margin: 18px 0 8px; }
.bubble h1 { font-size: 22px; } .bubble h2 { font-size: 19px; } .bubble h3 { font-size: 16px; }
.bubble ul, .bubble ol { margin: 0 0 12px; padding-left: 22px; }
.bubble li { margin: 3px 0; }
.bubble a { color: var(--accent); }
.bubble code { background: var(--accent-soft); padding: 1px 5px; border-radius: 5px; font-size: .88em; font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; }
.bubble pre { background: var(--code-bg); color: var(--code-text); padding: 13px 15px; border-radius: 11px; overflow-x: auto; margin: 0 0 12px; }
.bubble pre code { background: none; padding: 0; color: inherit; font-size: 13px; line-height: 1.5; }
.bubble blockquote { border-left: 3px solid var(--accent); margin: 0 0 12px; padding-left: 12px; color: var(--text-soft); }

.cursor::after { content: "▋"; color: var(--accent); animation: blink 1s steps(2) infinite; margin-left: 1px; }
@keyframes blink { 50% { opacity: 0; } }

/* thinking + tools */
.chip { display: inline-flex; align-items: center; gap: 7px; background: var(--bg-elev); border: 1px solid var(--border); border-radius: 9px; padding: 7px 12px; font-size: 13px; margin: 0 0 10px; color: var(--text-soft); }
.chip .tname { font-weight: 600; color: var(--text); font-family: ui-monospace, Menlo, Consolas, monospace; }
details.fold { margin: 0 0 12px; border: 1px solid var(--border); border-radius: 10px; background: var(--bg-elev); overflow: hidden; }
details.fold summary { cursor: pointer; padding: 8px 13px; font-size: 13px; color: var(--text-soft); user-select: none; }
details.fold summary::-webkit-details-marker { color: var(--accent); }
details.fold pre { margin: 0; border-radius: 0; border-top: 1px solid var(--border); max-height: 320px; }
details.thinking summary { color: var(--accent); font-style: italic; }

.done-meta { font-size: 12px; color: var(--text-soft); margin-top: -8px; margin-bottom: 20px; }
.err { background: var(--accent-soft); border: 1px solid var(--danger); color: var(--danger); border-radius: 10px; padding: 10px 14px; margin-bottom: 16px; font-size: 14px; }

/* ---------- Composer ---------- */
.composer { border-top: 1px solid var(--border); background: var(--bg); padding: 12px 0 16px; }
.composer-inner { max-width: 760px; margin: 0 auto; padding: 0 20px; }
.input-row { display: flex; align-items: flex-end; gap: 10px; background: var(--bg-input); border: 1px solid var(--border); border-radius: 16px; padding: 8px 8px 8px 16px; box-shadow: var(--shadow); }
.input-row:focus-within { border-color: var(--accent); }
.input-row textarea {
  flex: 1; border: none; background: none; color: var(--text); resize: none; font-size: 15px;
  line-height: 1.5; max-height: 200px; padding: 6px 0; outline: none;
}
.send-btn { width: 38px; height: 38px; border: none; border-radius: 11px; background: var(--accent); color: #fff; font-size: 18px; display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.send-btn:disabled { opacity: .4; }
.send-btn.stop { background: var(--danger); }
.composer-hint { text-align: center; font-size: 11px; color: var(--text-soft); margin-top: 8px; }

.backdrop { display: none; position: fixed; inset: 0; background: rgba(0,0,0,.35); z-index: 8; }

/* ---------- Mobile ---------- */
@media (max-width: 760px) {
  #sidebar { position: fixed; top: 0; left: 0; bottom: 0; z-index: 10; transform: translateX(-100%); box-shadow: 2px 0 12px rgba(0,0,0,.15); }
  #sidebar.open { transform: translateX(0); }
  .backdrop.show { display: block; }
  .hamburger { display: block; }
  .mwrap, .composer-inner { padding: 0 14px; }
  body { font-size: 15px; }
}