:root{
  --paper:#FAF6EF; --paper2:#F3ECDF; --ink:#2B2723; --ink2:#6B6258;
  --rule:#D8CDBA; --accent:#9C5C38; --accent-soft:#E8D9C9;
  --green:#3E6B4F; --green-soft:#DFE9E0; --red:#A6402E; --red-soft:#F3DFD8;
  --yellow:#B98A2F; --yellow-soft:#F2E7C9;
  --shadow:0 1px 0 rgba(43,39,35,.06);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:auto}
body{
  font-family:"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  background:var(--paper); color:var(--ink); line-height:1.7;
  min-height:100vh;
}
.serif{font-family:"Noto Serif SC","Songti SC","SimSun",serif}
h1,h2,h3,.brand{font-family:"Noto Serif SC","Songti SC","SimSun",serif}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}

/* ===== 顶栏 ===== */
.topbar{
  position:sticky;top:0;z-index:50;
  background:var(--paper); border-bottom:2px solid var(--ink);
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:10px 20px;flex-wrap:wrap;
}
.brand{font-size:22px;font-weight:900;letter-spacing:.5px;display:flex;align-items:center;gap:10px}
.brand .mark{
  width:34px;height:34px;border-radius:6px;background:var(--accent);color:var(--paper);
  display:inline-flex;align-items:center;justify-content:center;
  font-size:18px;font-weight:900;font-family:Georgia,serif;
}
.brand small{display:block;font-size:11px;font-weight:500;color:var(--ink2);letter-spacing:1.5px}
.nav{display:flex;gap:4px;flex-wrap:wrap}
.nav button{
  font-size:16px;font-weight:500;padding:8px 18px;border-radius:999px;color:var(--ink2);
  min-height:44px;
}
.nav button.on{background:var(--ink);color:var(--paper)}
.nav button:hover:not(.on){background:var(--paper2)}
.userbox{display:flex;align-items:center;gap:10px;margin-left:auto}
.userbox[hidden]{display:none}
.ub-name{font-size:14.5px;font-weight:700;color:var(--accent);white-space:nowrap}
.ub-logout{
  font-size:13px;padding:5px 12px;border:1.5px solid var(--rule);border-radius:999px;color:var(--ink2);
  min-height:34px;transition:all .15s;
}
.ub-logout:hover{border-color:var(--red);color:var(--red);background:var(--red-soft)}

/* ===== 登录页 ===== */
.login-wrap{max-width:440px;margin:8vh auto 0;padding:0 20px}
.login-card{
  background:var(--paper2);border:2px solid var(--ink);box-shadow:var(--shadow);
  padding:34px 36px 30px;
}
.login-card h2{font-size:26px;font-weight:900;margin-bottom:10px}
.login-tip{font-size:15.5px;color:var(--ink2);margin-bottom:22px;line-height:1.8}
.login-field{margin-bottom:16px}
.login-field label{display:block;font-size:14px;font-weight:700;color:var(--ink);margin-bottom:6px}
.login-field input{
  width:100%;font-size:17px;padding:11px 14px;border:1.5px solid var(--rule);background:var(--paper);
  color:var(--ink);outline:none;border-radius:4px;min-height:46px;
}
.login-field input:focus{border-color:var(--accent)}
.login-btn{width:100%;min-height:48px;font-size:17px;margin-top:6px}
.login-err{min-height:22px;font-size:14px;color:var(--red);margin-top:10px}

/* ===== 主容器 ===== */
main{max-width:900px;margin:0 auto;padding:26px 20px 80px}
.view-head{margin-bottom:22px}
.view-head .kicker{
  font-size:13px;letter-spacing:2px;color:var(--accent);font-weight:700;margin-bottom:6px;
}
.view-head h1{font-size:34px;font-weight:900;line-height:1.25}
.view-head p{color:var(--ink2);margin-top:8px;font-size:16px;max-width:60ch}

/* ===== 首页：主题卡 ===== */
.hero{
  border:2px solid var(--ink);background:var(--paper2);
  padding:26px 26px 22px;margin-bottom:26px;position:relative;
}
.hero h1{font-size:36px;font-weight:900;line-height:1.3}
.hero .stats{display:flex;gap:26px;margin-top:16px;flex-wrap:wrap}
.hero .stat b{font-size:30px;font-weight:900;font-family:Georgia,serif}
.hero .stat span{display:block;font-size:14px;color:var(--ink2)}
.topic-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.topic-card{
  border:1.5px solid var(--ink);background:#fffdf8;padding:16px 16px 14px;
  position:relative;transition:transform .12s ease,box-shadow .12s ease;
  display:flex;flex-direction:column;gap:8px;text-align:left;min-height:150px;
}
.topic-card:hover{transform:translate(-2px,-2px);box-shadow:4px 4px 0 var(--ink)}
.topic-card .tno{
  position:absolute;top:10px;right:12px;font-family:Georgia,serif;font-size:30px;font-weight:900;color:var(--rule);
}
.topic-card h3{font-size:20px;font-weight:900}
.topic-card .tshort{font-size:14px;font-weight:700;color:var(--accent)}
.topic-card p{font-size:14.5px;color:var(--ink2);flex:1}
.topic-card .tmeta{font-size:14px;color:var(--ink2);border-top:1px solid var(--rule);padding-top:8px;display:flex;justify-content:space-between}
.topic-card .acc{font-weight:700}
.topic-card.c0 h3,.topic-card.c0 .tshort{color:var(--accent)}
.topic-card.c1 h3,.topic-card.c1 .tshort{color:#7A5C2E}
.topic-card.c2 h3,.topic-card.c2 .tshort{color:var(--green)}
.topic-card.c3 h3,.topic-card.c3 .tshort{color:#A6402E}
.topic-card.c4 h3,.topic-card.c4 .tshort{color:#4E5E9E}
.topic-card.c5 h3,.topic-card.c5 .tshort{color:#8B4E6E}
.action-row{display:flex;gap:12px;margin-top:22px;flex-wrap:wrap}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-size:17px;font-weight:700;padding:12px 26px;border-radius:6px;
  border:2px solid var(--ink);background:#fffdf8;color:var(--ink);
  transition:transform .1s ease,box-shadow .1s ease;
}
.btn:hover{transform:translate(-1px,-1px);box-shadow:3px 3px 0 var(--ink)}
.btn:active{transform:translate(1px,1px);box-shadow:none}
.btn.primary{background:var(--accent);color:var(--paper)}
.btn.ghost{background:transparent;border-style:dashed}

/* ===== 练习页 ===== */
.quiz-head{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:6px}
.quiz-head .back-top{padding:6px 14px;font-size:14.5px;white-space:nowrap;border-color:var(--accent);color:var(--accent)}
.quiz-topic{font-size:16px;font-weight:700;color:var(--accent);background:var(--accent-soft);padding:4px 14px;border-radius:999px}
.quiz-progress{font-size:14px;color:var(--ink2)}
.q-meta{font-size:13px;color:var(--ink2);margin-bottom:14px}
.q-num{font-size:30px;font-weight:900;font-family:Georgia,serif;margin-right:8px;color:var(--accent)}
.quiz-card{
  border:2px solid var(--ink);background:#fffdf8;padding:20px;
}
.q-title{font-size:18px;font-weight:700;margin-bottom:16px}
.sent{
  border:1.5px solid var(--rule);background:var(--paper);padding:14px 16px;margin-bottom:12px;
  font-size:21px;line-height:1.7;display:flex;gap:12px;align-items:flex-start;
  cursor:pointer;transition:border-color .12s ease,background .12s ease;
}
.sent:hover{border-color:var(--accent)}
.sent .tag{
  flex:0 0 30px;height:30px;border-radius:50%;border:2px solid var(--ink);
  display:inline-flex;align-items:center;justify-content:center;
  font-weight:900;font-size:15px;font-family:Georgia,serif;margin-top:2px;
}
.sent .txt{flex:1}
.sent.picked{border-color:var(--accent);background:var(--accent-soft)}
.sent.picked .tag{background:var(--accent);color:var(--paper);border-color:var(--accent)}
.sent.correct{border-color:var(--green);background:var(--green-soft)}
.sent.correct .tag{background:var(--green);color:#fff;border-color:var(--green)}
.sent.wrong{border-color:var(--red);background:var(--red-soft)}
.sent.wrong .tag{background:var(--red);color:#fff;border-color:var(--red)}
.sent.disabled{pointer-events:none}
.order-bar{display:flex;gap:10px;flex-wrap:wrap;margin:16px 0}
.order-chip{
  border:1.5px solid var(--ink);background:#fffdf8;padding:6px 16px;border-radius:999px;
  font-size:15px;font-weight:700;display:none;align-items:center;gap:8px;
}
.order-chip.show{display:inline-flex}
.order-chip .n{background:var(--ink);color:var(--paper);width:22px;height:22px;border-radius:50%;display:inline-flex;align-items:center;justify-content:center;font-size:13px;font-family:Georgia,serif}
.quiz-actions{display:flex;gap:12px;margin-top:8px;flex-wrap:wrap}
.quiz-actions .btn{padding:10px 22px;font-size:16px}

/* 结果区 */
.result{
  margin-top:18px;border:2px solid var(--ink);padding:18px 20px;display:none;
}
.result.show{display:block}
.result.ok{background:var(--green-soft);border-color:var(--green)}
.result.bad{background:var(--red-soft);border-color:var(--red)}
.result .r-head{font-size:22px;font-weight:900;margin-bottom:6px}
.result .r-answer{font-size:16px;margin-bottom:10px}
.result .r-answer b{font-size:19px;font-family:Georgia,serif}
.explain{
  margin-top:12px;border-top:1.5px dashed var(--rule);padding-top:12px;
}
.explain .e-tip{
  background:var(--yellow-soft);border-left:4px solid var(--yellow);padding:10px 14px;margin-bottom:10px;font-size:15.5px;
}
.explain .e-tip.id{
  background:var(--green-soft);border-left-color:var(--green);margin-top:-2px;font-size:15px;
}
.explain .e-body{font-size:16px;color:var(--ink)}
.explain .e-body b{color:var(--accent)}
.explain .e-block{margin-top:14px;border-top:1.5px dashed var(--rule);padding-top:12px}
.explain .e-block .e-body{margin-bottom:4px}
.role-row{display:flex;gap:12px;align-items:baseline;margin:8px 0;font-size:15.5px;line-height:1.7}
.role-row .role-lt{
  flex:0 0 26px;height:26px;border-radius:50%;border:1.5px solid var(--accent);color:var(--accent);
  display:inline-flex;align-items:center;justify-content:center;font-weight:900;font-family:Georgia,serif;font-size:14px;
}
.role-row .role-txt{flex:1}
.link-row{display:flex;gap:12px;align-items:baseline;margin:8px 0;font-size:15.5px;line-height:1.7}
.link-row .link-no{
  flex:0 0 22px;height:22px;border-radius:5px;background:var(--ink);color:var(--paper);
  display:inline-flex;align-items:center;justify-content:center;font-size:12px;font-weight:700;font-family:Georgia,serif;
  margin-top:3px;
}
/* 印尼语块：独立淡绿容器，宽松行距 */
.explain .e-block.id{
  background:var(--green-soft);border-left:4px solid var(--green);
  padding:12px 16px;margin-top:14px;border-top:none;
}
.explain .e-block.id .e-body{color:var(--green)}
.explain .e-block.id .role-row,.explain .e-block.id .link-row{font-size:15px;color:var(--ink)}
.explain .e-block.id .role-lt{border-color:var(--green);color:var(--green)}
.explain .e-block.id .link-no{background:var(--green);color:#fff}
.quiz-end{margin-top:22px;display:none;text-align:center;padding:30px;border:2px solid var(--ink);background:var(--paper2)}
.quiz-end.show{display:block}
.quiz-end h2{font-size:26px;font-weight:900;margin-bottom:10px}

/* ===== 错题分析 ===== */
.stat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-bottom:22px}
.stat-box{border:1.5px solid var(--ink);background:#fffdf8;padding:16px}
.stat-box .sv{font-size:34px;font-weight:900;font-family:Georgia,serif}
.stat-box .sl{font-size:13.5px;color:var(--ink2);margin-top:2px}
.bars{border:2px solid var(--ink);background:#fffdf8;padding:18px 20px}
.bars h3{font-size:18px;font-weight:900;margin-bottom:14px}
.bar-row{display:grid;grid-template-columns:110px 1fr 84px;gap:10px;align-items:center;margin-bottom:12px}
.bar-row .bn{font-size:14.5px;font-weight:700}
.bar-row .btrack{background:var(--paper2);height:22px;border:1px solid var(--rule)}
.bar-row .bfill{height:100%;background:var(--accent);width:0;transition:width .5s ease}
.bar-row .bfill.warn{background:var(--red)}
.bar-row .bv{font-size:13px;color:var(--ink2);text-align:right}
.empty{
  border:2px dashed var(--rule);padding:36px 20px;text-align:center;color:var(--ink2);font-size:16px;margin-bottom:22px;
}
.empty b{color:var(--ink)}

/* ===== 错题本 ===== */
.wrong-list{margin-top:6px}
.wrong-item{
  border:1.5px solid var(--ink);background:#fffdf8;padding:14px 16px;margin-bottom:12px;
}
.wrong-item .w-top{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;align-items:center;margin-bottom:8px}
.wrong-item .w-topic{font-size:12.5px;font-weight:700;color:var(--accent);background:var(--accent-soft);padding:2px 10px;border-radius:999px}
.wrong-item .w-time{font-size:12.5px;color:var(--ink2)}
.wrong-item .w-sents{font-size:17px;margin-bottom:8px}
.wrong-item .w-sents .lab{color:var(--ink2);font-size:13px;margin-right:4px}
.wrong-item .w-sents .ltr{font-family:Georgia,serif;font-weight:900;color:var(--accent)}
.wrong-item .w-ans{font-size:14.5px;margin-bottom:10px}
.wrong-item .w-ans .mine{color:var(--red);font-weight:700}
.wrong-item .w-ans .right{color:var(--green);font-weight:700}
.wrong-item .w-actions{display:flex;gap:10px}
.wrong-item .w-actions button{font-size:13.5px;font-weight:700;padding:5px 14px;border:1.5px solid var(--ink);border-radius:6px}
.wrong-item .w-actions button:hover{background:var(--paper2)}

/* ===== 页脚 & 提示 ===== */
.foot{margin-top:40px;border-top:1.5px solid var(--rule);padding-top:14px;color:var(--ink2);font-size:14px;display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap}
.toast{
  position:fixed;left:50%;bottom:28px;transform:translateX(-50%) translateY(20px);
  background:var(--ink);color:var(--paper);padding:10px 22px;border-radius:8px;font-size:15px;font-weight:700;
  opacity:0;pointer-events:none;transition:opacity .25s ease,transform .25s ease;z-index:100;
}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

@media (max-width:760px){
  .topic-grid{grid-template-columns:1fr 1fr}
  .stat-grid{grid-template-columns:1fr 1fr}
  .view-head h1{font-size:28px}
  .hero h1{font-size:28px}
  .sent{font-size:19px;padding:12px 12px}
  .q-title{font-size:16px}
  .bar-row{grid-template-columns:88px 1fr 70px}
}
@media (max-width:480px){
  .topic-grid{grid-template-columns:1fr}
  .stat-grid{grid-template-columns:1fr}
  .brand{font-size:19px}
}