/* 配色和标题字体取自 Latent 山屋（hut/prototype.html），正文用系统字体保证可读 */
@font-face {
  font-family: "YShiWritten";
  src: url("fonts/YShiWritten-SC-GB2312.woff2") format("woff2");
  font-display: swap;
}

:root {
  --paper: #FBF8F2;
  --chalk: #F2EFE8;
  --oak: #CFAB7E;
  --ink: #3A2F28;
  --ink-2: #76695F;
  --gold: #8B6A31;
  --glacier: #5D84A2;
  --slate: #34424A;
  --brick: #A4493E;
  --line: #E4DDD0;
  --bubble-user: #EFE6D6;
  --f-title: "YShiWritten", "Songti SC", "STSong", serif;
  --f-body: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  --f-mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --vv-h: 100dvh;
  --vv-top: 0px;
  --safe-b: env(safe-area-inset-bottom, 0px);
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; background: var(--paper); color: var(--ink); font: 16px/1.65 var(--f-body); }
button, input, textarea { font: inherit; color: inherit; }
[hidden] { display: none !important; }

.title { font-family: var(--f-title); font-weight: normal; margin: 0; letter-spacing: .04em; }
.hint { color: var(--ink-2); font-size: 13px; margin: 0; }
.error { color: var(--brick); }

.primary { background: var(--slate); color: var(--paper); border: 0; border-radius: 999px; padding: 8px 18px; cursor: pointer; }
.primary:disabled { opacity: .5; }
.text-btn { background: none; border: 0; padding: 2px 6px; color: var(--ink-2); font-size: 13px; cursor: pointer; }
.text-btn:hover { color: var(--ink); }
.icon-btn { background: var(--chalk); border: 1px solid var(--line); border-radius: 999px; width: 40px; height: 40px; flex: none; cursor: pointer; font-family: var(--f-title); }

/* ---------- 登录 ---------- */
.login { min-height: 100%; display: grid; place-items: center; padding: 16px; }
.login form { display: grid; gap: 14px; width: min(320px, 100%); text-align: center; }
.login .title { font-size: 40px; color: var(--gold); }
.login input { font-size: 16px; padding: 10px 14px; border: 1px solid var(--line); border-radius: 12px; background: #fff; }

/* ---------- 外壳 ---------- */
.app { position: fixed; top: var(--vv-top); left: 0; right: 0; height: var(--vv-h); display: flex; flex-direction: column; }
#panes { flex: 1; min-height: 0; display: flex; }
.tabs { display: flex; border-top: 1px solid var(--line); background: var(--chalk); padding-bottom: var(--safe-b); }
.tabs button { flex: 1; background: none; border: 0; padding: 10px 0; color: var(--ink-2); font-family: var(--f-title); font-size: 18px; cursor: pointer; }
.tabs button[aria-current="page"] { color: var(--gold); }
.keyboard-up .tabs { display: none; }

/* ---------- 聊天页 ---------- */
.pane { flex: 1; min-width: 0; display: flex; flex-direction: column; max-width: 760px; margin: 0 auto; width: 100%; }
.pane-head { padding: 10px 16px 6px; border-bottom: 1px solid var(--line); display: flex; flex-wrap: wrap; align-items: center; gap: 6px 14px; }
.pane-head .title { font-size: 24px; color: var(--gold); margin-right: auto; }
.pane-note { flex-basis: 100%; }
.pane-note:empty { display: none; }
.switches { display: flex; gap: 12px; flex-wrap: wrap; }
.switch { display: flex; align-items: center; gap: 6px; font-size: 13px; color: var(--ink-2); }
.seg { display: inline-flex; border: 1px solid var(--line); border-radius: 999px; overflow: hidden; }
.seg button { background: none; border: 0; padding: 2px 10px; font-size: 13px; color: var(--ink-2); cursor: pointer; }
.seg button[aria-pressed="true"] { background: var(--glacier); color: #fff; }
.switch-state:empty { display: none; }

.msgs { flex: 1; min-height: 0; overflow-y: auto; padding: 12px 16px 20px; display: flex; flex-direction: column; gap: 14px; overscroll-behavior: contain; }
.older { align-self: center; }
.msg { display: grid; gap: 4px; justify-items: start; max-width: 100%; }
.msg.from-user { justify-items: end; }
.msg .who { font-size: 12px; color: var(--ink-2); font-family: var(--f-title); font-size: 15px; }
.msg.from-claude .who { color: var(--gold); }
.msg.from-gpt .who { color: var(--glacier); }
.msg .body { max-width: 100%; overflow-wrap: anywhere; }
.msg.from-user .body { background: var(--bubble-user); border-radius: 16px 16px 4px 16px; padding: 8px 12px; white-space: pre-wrap; max-width: 85%; }
.msg .body > :first-child { margin-top: 0; }
.msg .body > :last-child { margin-bottom: 0; }
.pic { max-width: min(240px, 70%); border-radius: 12px; border: 1px solid var(--line); }
.thinking, .superseded { font-size: 14px; color: var(--ink-2); border-left: 2px solid var(--oak); padding-left: 10px; max-width: 100%; }
.thinking summary, .superseded summary { cursor: pointer; font-size: 13px; }
.thinking-text { white-space: pre-wrap; margin-top: 4px; }
.actions { display: flex; gap: 4px; margin-left: -6px; }
.msg.from-user .actions { display: none; }
.stop { margin-left: -6px; color: var(--brick); }

/* markdown 内容 */
.body table { border-collapse: collapse; font-size: 14px; }
.body th, .body td { border: 1px solid var(--line); padding: 4px 8px; }
.table-scroll { overflow-x: auto; max-width: 100%; }
.body code { font-family: var(--f-mono); font-size: .9em; background: var(--chalk); padding: 0 4px; border-radius: 4px; }
.code-wrap { background: var(--chalk); border-radius: 10px; overflow: hidden; max-width: 100%; }
.code-head { display: flex; justify-content: space-between; align-items: center; padding: 2px 10px; font-size: 12px; color: var(--ink-2); }
.code-head button { background: none; border: 0; color: var(--ink-2); cursor: pointer; font-size: 12px; }
.code-wrap pre { margin: 0; padding: 8px 12px 12px; overflow-x: auto; }
.code-wrap pre code { background: none; padding: 0; }
.svg-frame { width: 100%; border: 0; display: block; background: #fff; border-radius: 8px; }
.body blockquote { margin: 0; padding-left: 12px; border-left: 3px solid var(--oak); color: var(--ink-2); }
.body a { color: var(--glacier); }

/* ---------- 输入框 ---------- */
.composer { border-top: 1px solid var(--line); padding: 8px 16px 10px; display: grid; gap: 6px; background: var(--paper); }
.composer-row { display: flex; gap: 8px; align-items: flex-end; }
.composer textarea { flex: 1; min-width: 0; resize: none; font-size: 16px; line-height: 1.5; padding: 8px 12px; border: 1px solid var(--line); border-radius: 20px; background: #fff; max-height: 160px; }
.send { flex: none; height: 40px; }
.thumbs { display: flex; gap: 6px; flex-wrap: wrap; }
.thumb { padding: 0; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; width: 56px; height: 56px; background: none; cursor: pointer; }
.thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }