/* 荀子网站更新 · 共用样式表
   引用：<link rel="stylesheet" href="/static/css/xunzi3.css">
   配色与字体对齐 index.html / siku.html：
   宣纸白 #fdfdfc 背景、金 #b48c5a 主色、墨灰 #1f2937 正文、Noto Serif SC
   所有新增页面共用，改一处即全站生效 */

:root{
  --paper:#fdfdfc;        /* 主背景，同 index.html 的 bg-xunzi-paper */
  --paper-warm:#fdf5e6;   /* 宣纸黄，同聊天气泡，用于强调块 */
  --paper-grey:#f9fafb;   /* 交替区块背景，同 index.html 的 bg-gray-50 */
  --ink:#1f2937;          /* 正文，同 xunzi-navy */
  --ink-2:#6b7280;        /* 次要文字 */
  --ink-3:#4b5563;
  --gold:#b48c5a;         /* 主色，同 xunzi-gold */
  --gold-dark:#a37b4b;    /* hover */
  --line:#e5e7eb;
  --line-warm:#e0d9ce;
  --radius:12px;
  --maxw:1200px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:5rem}
body{
  margin:0;background:var(--paper);color:var(--ink);
  font-family:'Noto Serif SC',serif;
  font-size:16px;line-height:1.8;
}
a{color:var(--gold);text-decoration:none}
a:hover{color:var(--gold-dark)}
img{max-width:100%;height:auto}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 1.5rem}

/* ---------- 顶栏（沿用 index.html 的玻璃拟态写法） ---------- */
.xz-nav{
  position:sticky;top:0;z-index:50;
  background:rgba(253,253,252,.8);backdrop-filter:blur(12px);
  box-shadow:0 1px 2px rgba(0,0,0,.05);
}
.xz-nav .inner{max-width:var(--maxw);margin:0 auto;padding:1rem 1.5rem;
  display:flex;align-items:center;gap:1rem}
.xz-nav img{height:2.5rem;width:auto}
.xz-nav .brand{font-size:1.35rem;font-weight:700;color:var(--gold)}
.xz-nav .links{margin-left:auto;display:flex;gap:1.75rem;flex-wrap:wrap}
.xz-nav .links a{color:var(--ink);font-size:.95rem;transition:color .3s}
.xz-nav .links a:hover{color:var(--gold)}
.xz-nav .links a.on{color:var(--gold);font-weight:700}
@media(max-width:768px){.xz-nav .links{gap:1rem;font-size:.85rem}}

/* ---------- 区块与标题 ---------- */
.hero{padding:4.5rem 0 3.5rem;background:var(--paper)}
.eyebrow{font-size:.85rem;letter-spacing:.2em;color:var(--gold);margin:0 0 .9rem;font-weight:700}
h1{font-size:2.5rem;line-height:1.25;margin:0 0 1.1rem;font-weight:700}
h2{font-size:1.9rem;margin:0 0 1.5rem;font-weight:700;text-align:center}
/* 金色下划线，同 index.html 的 .title-underline */
h2::after{content:'';display:block;width:80px;height:3px;
  background:var(--gold);margin:1rem auto 0}
h2.left{text-align:left}
h2.left::after{margin-left:0}
h3{font-size:1.25rem;margin:1.6rem 0 .6rem;font-weight:700}
section{padding:3.5rem 0}
section:nth-of-type(even){background:var(--paper-grey)}
.lead{font-size:1.05rem;color:var(--ink-3);max-width:52rem;line-height:1.85}
h2+.lead{margin-left:auto;margin-right:auto;margin-bottom:2rem}
.muted{color:var(--ink-2);font-size:.92rem}

/* ---------- 徽标与按钮（沿用 btn-custom-* 视觉） ---------- */
.badge{display:inline-block;padding:.2rem .8rem;border-radius:9999px;
  font-size:.78rem;margin:0 .4rem .4rem 0;
  background:rgba(180,140,90,.12);color:var(--gold-dark);font-weight:700}
.badge.grey{background:var(--paper-grey);color:var(--ink-2);
  border:1px solid var(--line);font-weight:400}

.btn{display:inline-block;padding:.75rem 2rem;border-radius:.375rem;
  background:var(--gold);color:#fff;border:1px solid var(--gold);
  font-weight:700;cursor:pointer;transition:all .3s ease;font-family:inherit;font-size:1rem}
.btn:hover{background:var(--gold-dark);color:#fff}
.btn.ghost{background:transparent;color:var(--ink);border-color:var(--ink)}
.btn.ghost:hover{background:var(--ink);color:var(--paper)}
.btn:disabled{opacity:.5;cursor:not-allowed}

/* ---------- 卡片（沿用 .feature-card 视觉） ---------- */
.card{background:#fff;border:1px solid var(--line);border-radius:.5rem;
  padding:2rem;transition:transform .3s ease,box-shadow .3s ease}
.card:hover{transform:translateY(-5px);box-shadow:0 10px 20px rgba(0,0,0,.08)}
.card.flat:hover{transform:none;box-shadow:none}
a.card{color:inherit;display:block}
a.card:hover{color:inherit;border-color:var(--gold)}

.grid{display:grid;gap:2rem}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
@media(max-width:1024px){.g4{grid-template-columns:repeat(2,1fr)}}
@media(max-width:768px){
  .g2,.g3,.g4{grid-template-columns:1fr}
  h1{font-size:1.9rem}h2{font-size:1.5rem}
  section{padding:2.5rem 0}
}

/* ---------- 表格（沿用 siku.html 写法） ---------- */
table{width:100%;border-collapse:collapse;background:#fff}
th,td{padding:.75rem 1rem;border:1px solid var(--line);text-align:left;font-size:.95rem}
th{background:var(--paper-grey);font-weight:700;color:#374151}
tbody tr:nth-child(even){background:var(--paper-grey)}
.table-scroll{overflow-x:auto;border-radius:.5rem;border:1px solid var(--line)}
.table-scroll table{border:none}

figure{margin:1.75rem 0;background:#fff;border:1px solid var(--line);
  border-radius:.75rem;padding:1rem}
figcaption{font-size:.88rem;color:var(--ink-2);margin-top:.6rem;text-align:center}

/* ---------- 四阶段训练卡片 ---------- */
.stage{background:#fff;border:1px solid var(--line);border-radius:.5rem;
  padding:1.75rem;transition:transform .3s ease,box-shadow .3s ease}
.stage:hover{transform:translateY(-5px);box-shadow:0 10px 20px rgba(0,0,0,.08)}
.stage .no{font-size:.8rem;letter-spacing:.15em;color:var(--gold);font-weight:700}
.stage h3{margin:.4rem 0 .6rem;font-size:1.15rem}
.stage ul{margin:.7rem 0 0;padding-left:1.1rem;font-size:.9rem;color:var(--ink-3)}
.stage li{margin-bottom:.3rem}
.stage .fw{margin-top:1rem;padding-top:.7rem;border-top:1px solid var(--line);
  font-size:.78rem;color:var(--gold);letter-spacing:.03em}

/* ---------- 时间轴（专著页） ---------- */
.tl{position:relative;padding-left:2.4rem}
.tl::before{content:"";position:absolute;left:.65rem;top:.4rem;bottom:.4rem;
  width:2px;background:var(--line)}
.tl-item{position:relative;margin-bottom:2.2rem;opacity:0;transform:translateY(30px);
  transition:opacity .8s cubic-bezier(.215,.61,.355,1),transform .8s cubic-bezier(.215,.61,.355,1)}
.tl-item.in{opacity:1;transform:none}
.tl-item::before{content:"";position:absolute;left:-2.05rem;top:.75rem;
  width:.75rem;height:.75rem;border-radius:50%;background:var(--gold);
  border:3px solid var(--paper);box-shadow:0 0 0 1px var(--line)}
.tl-item .yr{font-size:.8rem;letter-spacing:.12em;color:var(--gold);font-weight:700}
@media(prefers-reduced-motion:reduce){
  .tl-item{opacity:1;transform:none;transition:none}
}

/* ---------- 对话演示（对齐 chat_style.css） ---------- */
.chat-box{background:#fff;border:1px solid var(--line);border-radius:.75rem;
  height:28rem;overflow-y:auto;padding:1.25rem;
  display:flex;flex-direction:column;gap:1.25rem}
.chat-box::-webkit-scrollbar{width:6px}
.chat-box::-webkit-scrollbar-track{background:transparent}
.chat-box::-webkit-scrollbar-thumb{background:#ccc;border-radius:10px}
.chat-box::-webkit-scrollbar-thumb:hover{background:#aaa}

.chat-message{display:flex;gap:.75rem;max-width:85%}
.chat-message.user{margin-left:auto;flex-direction:row-reverse}
.chat-message.bot,.chat-message.bot-error{margin-right:auto}
.message-avatar{width:2.5rem;height:2.5rem;border-radius:9999px;
  background:#e5e7eb;display:flex;align-items:center;justify-content:center;
  font-weight:700;flex-shrink:0}
.message-content{display:flex;flex-direction:column;gap:.5rem;min-width:0}
.message-text{padding:.75rem 1.25rem;border-radius:1.25rem;line-height:1.6;
  word-wrap:break-word;overflow-wrap:anywhere}
.chat-message.user .message-text{background:var(--paper-warm);color:#374151;
  border:1px solid var(--line-warm);border-bottom-right-radius:.25rem}
.chat-message.bot .message-text{background:#fff;color:var(--ink);
  border:1px solid var(--line);border-bottom-left-radius:.25rem}
.chat-message.bot-error .message-text{background:#fef2f2;color:#991b1b;
  border:1px solid #fecaca;border-bottom-left-radius:.25rem}
.message-text p{margin:0 0 .6rem}
.message-text p:last-child{margin-bottom:0}
.message-text ul,.message-text ol{margin:.4rem 0;padding-left:1.3rem}
.message-text pre{background:#f5f1e9;border:1px solid var(--line-warm);
  border-radius:.5rem;padding:.9rem;overflow-x:auto;font-size:.85rem}
.message-text code{font-size:.9em}
.thought-bubble{padding:1rem;background:#f3f4f6;border:1px dashed #d1d5db;
  border-radius:.75rem;font-size:.9em;color:var(--ink-3)}
.thought-bubble-header{font-weight:700;margin-bottom:.5rem;color:#374151}

.composer{display:flex;gap:.75rem;margin-top:1rem}
.composer textarea{flex:1;resize:none;height:3.25rem;padding:.75rem 1rem;
  font-size:1rem;border:1px solid var(--line);border-radius:.5rem;
  font-family:inherit;background:#fff;color:var(--ink);line-height:1.5}
.composer textarea:focus{outline:none;border-color:var(--gold)}
.chips{display:flex;gap:.6rem;flex-wrap:wrap;margin-bottom:1rem}
.chip{padding:.4rem .9rem;border:1px solid var(--line);border-radius:9999px;
  background:rgba(249,250,251,.8);font-size:.88rem;cursor:pointer;
  color:var(--ink-3);font-family:inherit;transition:all .2s ease-in-out}
.chip:hover{transform:translateY(-2px);box-shadow:0 4px 12px rgba(0,0,0,.08);
  border-color:var(--gold);color:var(--gold-dark)}

/* ---------- 页脚 ---------- */
.xz-foot{padding:2rem 0 2.5rem;font-size:.88rem;color:var(--ink-2);
  text-align:center;border-top:1px solid var(--line);background:var(--paper)}

:focus-visible{outline:2px solid var(--gold);outline-offset:2px}

/* ==========================================================
   智能体模式：plan → act → reflect 阶段卡片
   ========================================================== */
.agent-run{border:1px solid var(--line);border-radius:.75rem;background:#fff;
  overflow:hidden;margin-right:auto;max-width:100%;width:100%}
.agent-run + .agent-run{margin-top:1rem}

.phase{border-top:1px solid var(--line)}
.phase:first-child{border-top:none}
.phase-head{display:flex;align-items:center;gap:.6rem;padding:.7rem 1rem;
  cursor:pointer;user-select:none;background:var(--paper-grey);
  font-size:.9rem;font-weight:700;color:var(--ink-3)}
.phase-head:hover{background:#f3f4f6}
.phase-head .tag{font-size:.68rem;letter-spacing:.1em;padding:.12rem .5rem;
  border-radius:9999px;background:rgba(180,140,90,.15);color:var(--gold-dark);
  font-weight:700;flex-shrink:0}
.phase-head .caret{margin-left:auto;transition:transform .2s;color:var(--ink-2);
  font-size:.8rem}
.phase.collapsed .caret{transform:rotate(-90deg)}
.phase.collapsed .phase-body{display:none}
.phase-body{padding:.9rem 1rem;font-size:.95rem;line-height:1.7}
.phase-body p:first-child{margin-top:0}
.phase-body p:last-child{margin-bottom:0}

/* 状态点 */
.dotstat{width:.5rem;height:.5rem;border-radius:50%;flex-shrink:0}
.dotstat.run{background:var(--gold);animation:pulse 1.2s ease-in-out infinite}
.dotstat.ok{background:#16a34a}
.dotstat.err{background:#dc2626}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.3}}
@media(prefers-reduced-motion:reduce){.dotstat.run{animation:none}}

/* 计划步骤列表 */
.plan-list{list-style:none;margin:0;padding:0;counter-reset:pstep}
.plan-list li{position:relative;padding:.45rem 0 .45rem 2rem;
  border-bottom:1px dashed var(--line);color:var(--ink-3)}
.plan-list li:last-child{border-bottom:none}
.plan-list li::before{counter-increment:pstep;content:counter(pstep);
  position:absolute;left:0;top:.5rem;width:1.35rem;height:1.35rem;
  border-radius:50%;background:var(--paper-warm);border:1px solid var(--line-warm);
  color:var(--gold-dark);font-size:.72rem;font-weight:700;
  display:flex;align-items:center;justify-content:center}
.plan-list li.done{color:var(--ink)}
.plan-list li.done::before{content:"✓";background:#dcfce7;border-color:#86efac;color:#16a34a}
.plan-list li.active::before{background:var(--gold);border-color:var(--gold);color:#fff}

/* 步骤内的观察/结论 */
.obs{margin-top:.5rem;padding:.6rem .8rem;background:var(--paper-grey);
  border-left:3px solid var(--gold);border-radius:0 .3rem .3rem 0;
  font-size:.9rem;color:var(--ink-3)}
.obs .obs-label{font-size:.7rem;letter-spacing:.1em;color:var(--gold-dark);
  font-weight:700;display:block;margin-bottom:.25rem}

/* 模式切换 */
.mode-switch{display:inline-flex;border:1px solid var(--line);border-radius:9999px;
  overflow:hidden;background:#fff}
.mode-switch button{padding:.35rem 1rem;border:none;background:transparent;
  font-family:inherit;font-size:.85rem;color:var(--ink-2);cursor:pointer;
  transition:all .2s}
.mode-switch button.on{background:var(--gold);color:#fff;font-weight:700}

/* ==========================================================
   专著页：封面 + 简介
   ========================================================== */
.book-hero{display:grid;grid-template-columns:280px 1fr;gap:2.5rem;align-items:start}
.book-hero .cover img{width:100%;display:block;
  filter:drop-shadow(0 12px 28px rgba(0,0,0,.18))}
.book-meta{list-style:none;margin:1.4rem 0 0;padding:0;font-size:.92rem;color:var(--ink-3)}
.book-meta li{padding:.35rem 0;border-bottom:1px solid var(--line)}
.book-meta li:last-child{border-bottom:none}
.book-meta .k{display:inline-block;width:4.5rem;color:var(--ink-2)}
@media(max-width:768px){
  .book-hero{grid-template-columns:1fr;gap:1.5rem}
  .book-hero .cover{max-width:220px;margin:0 auto}
}

/* 研究成果总览页的专著卡片缩略图 */
.book-thumb{float:right;width:110px;margin:0 0 1rem 1.4rem;
  filter:drop-shadow(0 6px 16px rgba(0,0,0,.15))}
@media(max-width:768px){.book-thumb{float:none;display:block;margin:0 auto 1rem}}

/* ---------- 语言切换按钮 ---------- */
.lang-toggle{margin-left:1.25rem;padding:.25rem .7rem;border:1px solid var(--gold);
  border-radius:9999px;background:transparent;color:var(--gold);font-family:inherit;
  font-size:.82rem;font-weight:700;cursor:pointer;transition:all .2s;line-height:1.4}
.lang-toggle:hover{background:var(--gold);color:#fff}
@media(max-width:768px){.lang-toggle{margin-left:.6rem}}