:root{
  --navy:#1F3A5F; --terra:#C25B3A; --cream:#F7F3EA; --qbg:#F3EEE2;
  --ink:#2B2B2B; --gray:#6B6B6B; --line:#D8D2C4; --white:#fff;
}
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:-apple-system,"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
  background:var(--cream);color:var(--ink);line-height:1.7;font-size:15px}
a{color:var(--navy);text-decoration:none}
button{cursor:pointer;font-family:inherit}
input,textarea,select{font-family:inherit;font-size:14px}

/* 顶栏 */
.topbar{background:var(--navy);color:#fff;padding:0 16px;display:flex;align-items:center;
  height:52px;position:sticky;top:0;z-index:50;gap:6px;overflow-x:auto;white-space:nowrap}
.topbar .logo{font-weight:700;font-size:16px;margin-right:12px;flex-shrink:0}
.topbar .logo span{color:#E8A87C}
.navbtn{background:none;border:none;color:#cdd6e0;padding:6px 10px;border-radius:6px;font-size:14px;flex-shrink:0}
.navbtn.active,.navbtn:hover{background:rgba(255,255,255,.14);color:#fff}
.topbar .spacer{flex:1}
.userchip{font-size:13px;color:#cdd6e0;flex-shrink:0}

.wrap{max-width:960px;margin:0 auto;padding:20px 14px 60px}
.card{background:var(--white);border:1px solid var(--line);border-radius:12px;
  padding:22px;margin-bottom:16px;box-shadow:0 1px 3px rgba(31,58,95,.05)}
.card h2{color:var(--navy);font-size:19px;margin-bottom:12px}
.card h3{color:var(--navy);font-size:16px;margin:14px 0 8px}
.muted{color:var(--gray);font-size:13px}
.btn{background:var(--navy);color:#fff;border:none;padding:9px 20px;border-radius:8px;font-size:14px}
.btn:hover{opacity:.9}
.btn.terra{background:var(--terra)}
.btn.ghost{background:transparent;color:var(--navy);border:1px solid var(--navy)}
.btn.sm{padding:5px 12px;font-size:13px}
.input{width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:8px;margin-bottom:10px;background:#fff}
.tag{display:inline-block;padding:2px 10px;border-radius:20px;font-size:12px;margin-right:6px}
.tag.ok{background:#E7F2E7;color:#2E6B2E}
.tag.no{background:#F6E5E0;color:#A6462B}
.tag.navy{background:#E5EBF2;color:var(--navy)}

/* 登录页 */
.authbox{max-width:400px;margin:8vh auto}
.authbox .brand{text-align:center;margin-bottom:24px}
.authbox .brand h1{color:var(--navy);font-size:26px;letter-spacing:2px}
.authbox .brand p{color:var(--terra);font-size:14px;margin-top:6px}
.authtabs{display:flex;margin-bottom:16px;border-bottom:2px solid var(--line)}
.authtabs button{flex:1;background:none;border:none;padding:10px;font-size:15px;color:var(--gray)}
.authtabs button.active{color:var(--navy);font-weight:700;border-bottom:2px solid var(--terra);margin-bottom:-2px}

/* 首页 */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:14px}
.feature{background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px;cursor:pointer;transition:.15s}
.feature:hover{transform:translateY(-2px);box-shadow:0 4px 12px rgba(31,58,95,.1)}
.feature .ic{font-size:26px}
.feature b{display:block;color:var(--navy);margin:6px 0 4px;font-size:15px}
.feature p{font-size:12.5px;color:var(--gray);line-height:1.5}
.stagebar{background:var(--qbg);border-left:3px solid var(--terra);padding:12px 16px;border-radius:0 8px 8px 0;margin:10px 0}

/* 阅读页 */
.reader{display:flex;gap:16px;align-items:flex-start}
.toc{width:230px;flex-shrink:0;background:#fff;border:1px solid var(--line);border-radius:12px;
  padding:10px;max-height:78vh;overflow-y:auto;position:sticky;top:66px}
.toc button{display:block;width:100%;text-align:left;background:none;border:none;
  padding:8px 10px;border-radius:6px;font-size:13.5px;color:var(--ink)}
.toc button:hover{background:var(--qbg)}
.toc button.active{background:var(--navy);color:#fff}
.toc button.locked{color:#b5aa96}
.chapter{flex:1;background:#fff;border:1px solid var(--line);border-radius:12px;padding:30px 34px;min-height:60vh}
.chapter h2{color:var(--navy);font-size:22px;margin:18px 0 12px;padding-bottom:8px;border-bottom:1px solid var(--line)}
.chapter h3{color:var(--navy);font-size:17px;margin:18px 0 8px}
.chapter h4{color:var(--terra);font-size:15px;margin:14px 0 6px}
.chapter p{margin:9px 0;text-align:justify}
.chapter blockquote{background:var(--qbg);border-left:3px solid var(--terra);
  padding:12px 16px;margin:12px 0;border-radius:0 8px 8px 0;color:#4a4a4a;font-size:14px}
.chapter ul,.chapter ol{padding-left:22px;margin:8px 0}
.chapter li{margin:4px 0}
.chapter hr{border:none;border-top:1px solid var(--line);margin:18px 0}
.locktip{text-align:center;padding:60px 20px;color:var(--gray)}

/* 测评 */
.q{margin-bottom:18px}
.q .qt{font-weight:600;margin-bottom:8px}
.q label{display:block;padding:8px 12px;border:1px solid var(--line);border-radius:8px;
  margin-bottom:6px;cursor:pointer;font-size:14px;background:#fff}
.q label:hover{border-color:var(--navy)}
.q label.sel{border-color:var(--terra);background:#FDF6F3}
.resultbox{text-align:center;padding:20px}
.resultbox .stage{font-size:30px;color:var(--terra);font-weight:700;margin:8px 0}

/* 打卡 */
.week{margin-bottom:18px}
.week h3{color:var(--terra)}
.dayrow{display:flex;align-items:center;gap:10px;padding:9px 12px;background:#fff;
  border:1px solid var(--line);border-radius:8px;margin-bottom:6px}
.dayrow.done{background:#F2F7F2;border-color:#BCD8BC}
.dayrow .dn{width:52px;flex-shrink:0;font-weight:700;color:var(--navy);font-size:13px}
.dayrow .dt{flex:1;font-size:13.5px}
.dayrow input[type=checkbox]{width:18px;height:18px;accent-color:var(--terra)}
.progress{height:10px;background:var(--qbg);border-radius:5px;overflow:hidden;margin:10px 0}
.progress i{display:block;height:100%;background:linear-gradient(90deg,var(--terra),#E8A87C)}

/* AI聊天 */
.chatwrap{display:flex;gap:14px;align-items:flex-start}
.convlist{width:200px;flex-shrink:0;background:#fff;border:1px solid var(--line);
  border-radius:12px;padding:10px;max-height:74vh;overflow-y:auto}
.convlist button{display:block;width:100%;text-align:left;background:none;border:none;
  padding:8px;border-radius:6px;font-size:13px;color:var(--ink);white-space:nowrap;
  overflow:hidden;text-overflow:ellipsis}
.convlist button.active{background:var(--qbg);color:var(--navy);font-weight:600}
.chatmain{flex:1;background:#fff;border:1px solid var(--line);border-radius:12px;
  display:flex;flex-direction:column;height:74vh;min-height:0}
.msgs{flex:1;overflow-y:auto;padding:18px;min-height:0}
.msg{margin-bottom:14px;display:flex}
.msg .bub{max-width:82%;padding:10px 14px;border-radius:12px;font-size:14px;white-space:pre-wrap;word-break:break-word}
.msg.user{justify-content:flex-end}
.msg.user .bub{background:var(--navy);color:#fff;border-bottom-right-radius:3px}
.msg.ai .bub{background:var(--qbg);border-bottom-left-radius:3px}
.chatinput{display:flex;gap:8px;padding:12px;border-top:1px solid var(--line);flex-shrink:0}
.chatinput textarea{flex:1;resize:none;border:1px solid var(--line);border-radius:8px;padding:9px 12px;height:44px}

/* 表格 */
table.tbl{width:100%;border-collapse:collapse;font-size:13px}
.tbl th,.tbl td{border:1px solid var(--line);padding:6px 10px;text-align:left}
.tbl th{background:var(--qbg);color:var(--navy)}
.codebox{font-family:monospace;background:var(--qbg);padding:10px;border-radius:8px;
  white-space:pre-wrap;word-break:break-all;font-size:13px;margin-top:8px}
.toast{position:fixed;top:64px;left:50%;transform:translateX(-50%);background:var(--navy);
  color:#fff;padding:10px 22px;border-radius:24px;z-index:99;font-size:14px;box-shadow:0 4px 14px rgba(0,0,0,.2)}

@media (max-width:760px){
  .wrap{padding:12px 10px 20px}
  .reader,.chatwrap{flex-direction:column}
  .toc,.convlist{width:100%;position:static;max-height:160px}
  .chapter{padding:20px 16px}
  .chatwrap{height:calc(100dvh - 52px - 24px);display:flex;flex-direction:column;gap:8px}
  .convlist{flex-shrink:0}
  .chatmain{flex:1;height:auto;min-height:0}
  .chatinput textarea{height:40px;font-size:14px}
}