/* ============================================================
   中药饮片识图复习 · 统一设计系统
   ============================================================ */
:root{
  --bg:#f5f2ea;
  --surface:#fffdf8;
  --surface-2:#faf7ef;
  --ink:#2e2a22;
  --ink-2:#5d564a;
  --muted:#8d8577;
  --line:#e4ddcd;
  --line-2:#d5cbb6;
  --accent:#3f6b4a;
  --accent-hi:#4d7d59;
  --accent-soft:#eef5ef;
  --good:#2f7d51;
  --good-soft:#f1faf4;
  --bad:#b0392e;
  --bad-soft:#fdf4f3;
  --warn:#a9700f;
  --r-sm:8px;
  --r-md:12px;
  --r-lg:16px;
  --shadow-1:0 1px 2px rgba(70,58,38,.06);
  --shadow-2:0 8px 28px rgba(70,58,38,.10);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  background:var(--bg);color:var(--ink);
  font:15px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  -webkit-font-smoothing:antialiased;
  padding:18px 16px 48px;
}
.app{max-width:780px;margin:0 auto}

.topbar{margin-bottom:16px}
.topbar h1{font-size:19px;font-weight:650;letter-spacing:.4px;margin:0 0 12px;color:var(--ink)}
.progress{height:6px;background:#e8e1d1;border-radius:99px;overflow:hidden}
.progress .bar{height:100%;width:0;border-radius:99px;background:linear-gradient(90deg,var(--accent),var(--accent-hi));transition:width .28s ease}
.meta-line{display:flex;justify-content:space-between;font-size:12.5px;color:var(--muted);margin-top:7px}

.panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);padding:18px;box-shadow:var(--shadow-2)}
.hidden{display:none!important}

.row{margin-bottom:16px}
.field-label{display:block;font-size:12.5px;font-weight:600;letter-spacing:.5px;color:var(--muted);margin-bottom:8px}
.hint{font-size:13px;color:var(--muted);line-height:1.7}

/* 按钮：统一一套 */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:6px;
  font-family:inherit;font-size:14.5px;font-weight:500;line-height:1.2;
  border-radius:var(--r-md);cursor:pointer;padding:11px 18px;
  border:1px solid transparent;
  transition:background .15s,border-color .15s,color .15s,box-shadow .15s;
  white-space:nowrap;
}
.btn:active{transform:translateY(.5px)}
.btn-primary{background:var(--accent);color:#fff;border-color:var(--accent);box-shadow:var(--shadow-1)}
.btn-primary:hover{background:var(--accent-hi);border-color:var(--accent-hi)}
.btn-primary:disabled{background:#b9c9bd;border-color:#b9c9bd;cursor:not-allowed;box-shadow:none}
.btn-ghost{background:var(--surface-2);color:var(--ink-2);border-color:var(--line-2)}
.btn-ghost:hover{background:#f3eee0;border-color:#c9bea5;color:var(--ink)}
.btn-quiet{background:transparent;color:var(--muted);border-color:transparent;padding:8px 10px;font-size:13.5px}
.btn-quiet:hover{background:#f0ebdd;color:var(--ink-2)}
.btn-sm{padding:8px 13px;font-size:13.5px;border-radius:10px}
.btn-block{width:100%;padding:14px;font-size:15.5px}

/* 兼容旧类名（保证两种写法外观一致） */
.primary{background:var(--accent);color:#fff;border:1px solid var(--accent);border-radius:var(--r-md);padding:11px 18px;font-size:14.5px;cursor:pointer;font-family:inherit;font-weight:500;transition:background .15s,border-color .15s}
.primary:hover{background:var(--accent-hi);border-color:var(--accent-hi)}
.primary:disabled{background:#b9c9bd;border-color:#b9c9bd;cursor:not-allowed}
.primary.big{width:100%;padding:14px;font-size:15.5px}
.ghost{background:var(--surface-2);color:var(--ink-2);border:1px solid var(--line-2);border-radius:var(--r-md);padding:11px 16px;font-size:14px;cursor:pointer;font-family:inherit;transition:.15s}
.ghost:hover{background:#f3eee0;border-color:#c9bea5}
.link-btn{background:transparent;border:1px solid transparent;color:var(--muted);font-size:13.5px;padding:8px 10px;border-radius:10px;cursor:pointer;font-family:inherit;transition:.15s}
.link-btn:hover{background:#f0ebdd;color:var(--ink-2)}

.chips{display:flex;flex-wrap:wrap;gap:8px}
.chips.small{max-height:140px;overflow:auto;padding:2px 2px 2px 0}
.chip{
  font-family:inherit;font-size:13px;line-height:1.2;
  border:1px solid var(--line-2);background:var(--surface-2);color:var(--ink-2);
  border-radius:99px;padding:7px 13px;cursor:pointer;
  transition:background .15s,border-color .15s,color .15s;
}
.chip:hover{background:#f2ecdd;border-color:#c8bda3}
.chip.active{background:var(--accent);border-color:var(--accent);color:#fff}

.resume{border:1px solid #c8dfcd;background:var(--accent-soft);border-radius:var(--r-md);padding:14px;margin-bottom:18px}
.resume-txt{font-size:13.5px;color:#3e5a46;line-height:1.65}
.resume-txt b{color:var(--accent);font-weight:650}
.resume-actions{display:flex;gap:10px;margin-top:12px}
.resume-actions .primary,.resume-actions .btn{flex:1}

.quiz-head{display:flex;align-items:center;justify-content:space-between;margin:-4px 0 12px}
.quiz-pos{font-size:12.5px;color:var(--muted);font-variant-numeric:tabular-nums}

.figure{position:relative;background:#efe9da;border-radius:var(--r-md);overflow:hidden;display:flex;align-items:center;justify-content:center;min-height:240px;border:1px solid var(--line)}
.figure img{display:block;max-width:100%;max-height:62vh;object-fit:contain;cursor:zoom-in}
.zoom-hint{position:absolute;right:10px;bottom:10px;font-size:11.5px;color:#7d7666;background:rgba(255,253,248,.9);border:1px solid var(--line);border-radius:99px;padding:3px 9px;pointer-events:none}

.answers{margin:18px 0 4px;display:grid;gap:12px}
.answer-row{display:grid;grid-template-columns:64px 1fr;align-items:center;gap:12px}
.answer-row label{font-size:13.5px;color:var(--ink-2);font-weight:500}
.answer-row input{width:100%;padding:12px 14px;font-size:16px;font-family:inherit;border:1px solid var(--line-2);border-radius:var(--r-md);background:#fff;color:var(--ink);outline:none;transition:border-color .15s,box-shadow .15s,background .15s}
.answer-row input::placeholder{color:#b3ab9b}
.answer-row input:focus{border-color:var(--accent-hi);box-shadow:0 0 0 3px rgba(77,125,89,.14)}
.answer-row input.ok{border-color:#93c5a5;background:var(--good-soft)}
.answer-row input.err{border-color:#dda8a2;background:var(--bad-soft)}

.actions{display:flex;gap:10px;justify-content:flex-end;margin-top:16px}

.feedback{margin-top:18px;border-radius:var(--r-md);padding:16px;border:1px solid var(--line);background:var(--surface-2)}
.feedback.good{border-color:#c3e2cd;background:var(--good-soft)}
.feedback.bad{border-color:#eccfc9;background:var(--bad-soft)}
.fb-title{font-weight:650;font-size:15.5px;margin-bottom:10px;color:var(--ink)}
.feedback.good .fb-title{color:var(--good)}
.feedback.bad .fb-title{color:var(--bad)}
.fb-body{font-size:14px;color:var(--ink-2);line-height:1.9}
.fb-body .k{color:var(--muted);font-size:12.5px;margin-right:8px}
.fb-body b{color:var(--accent);font-weight:650}
.fb-body .note{display:block;margin-top:8px;font-size:12.5px;color:var(--warn)}
.feedback .btn,.feedback .primary{margin-top:14px;width:100%}

h2{font-size:17px;margin:0 0 14px;font-weight:650}
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:6px 0 20px}
.stat{background:var(--surface-2);border:1px solid var(--line);border-radius:var(--r-md);padding:14px 10px;text-align:center}
.stat .v{font-size:22px;font-weight:650;color:var(--accent);font-variant-numeric:tabular-nums}
.stat .l{font-size:12px;color:var(--muted);margin-top:3px}

.wrong-list{display:grid;gap:8px;margin-bottom:20px;max-height:46vh;overflow:auto}
.wrong-item{display:flex;gap:12px;align-items:center;border:1px solid var(--line);border-radius:var(--r-md);padding:8px;background:#fff}
.wrong-item img{width:58px;height:58px;object-fit:cover;border-radius:var(--r-sm);flex:none}
.wrong-item .t{font-size:13.5px;line-height:1.55}
.wrong-item .t .n{font-weight:650}
.wrong-item .t .f{color:var(--muted);font-size:12.5px}

.lightbox{
  position:fixed;inset:0;background:rgba(20,17,12,.94);
  display:flex;align-items:center;justify-content:center;
  z-index:50;padding:16px;cursor:zoom-out;
  touch-action:none;overflow:hidden;
}
.lightbox img{
  max-width:100%;max-height:100%;object-fit:contain;border-radius:var(--r-sm);
  transform-origin:center center;will-change:transform;
  transition:transform .06s linear;cursor:zoom-in;
}
.lightbox.zoomed img{cursor:grab}
.lightbox::after{
  content:"滚轮/双指缩放 · 拖动平移 · 双击复位 · Esc 关闭";
  position:fixed;left:50%;bottom:16px;transform:translateX(-50%);
  font-size:12px;color:rgba(255,255,255,.62);letter-spacing:.3px;
  background:rgba(0,0,0,.35);padding:5px 12px;border-radius:99px;
  pointer-events:none;white-space:nowrap;
}
@media (max-width:540px){ .lightbox::after{font-size:11px;bottom:12px} }

@media (max-width:540px){
  body{padding:14px 10px 36px}
  .panel{padding:14px;border-radius:14px}
  .topbar h1{font-size:17px}
  .answer-row{grid-template-columns:54px 1fr;gap:10px}
  .figure img{max-height:50vh}
  .actions{gap:8px}
  .actions .btn,.actions .ghost,.actions .primary{flex:1;padding-left:8px;padding-right:8px}
  .resume-actions{flex-direction:column}
}


/* ---- v3: 多用户 / 讲解 ---- */
.top-row{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:12px}
.top-row h1{margin:0}
.fb-body .explain{
  margin-top:10px;padding:10px 12px;border-radius:10px;
  background:#f6f3e8;border-left:3px solid var(--accent);
  font-size:13.5px;line-height:1.75;color:#4a4436;
}
.fb-body .src{margin-top:8px;font-size:12.5px;color:var(--muted)}

.sheet{position:fixed;inset:0;background:rgba(28,24,17,.55);z-index:60;display:flex;align-items:center;justify-content:center;padding:18px}
.sheet-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);
  max-width:420px;width:100%;padding:18px;box-shadow:var(--shadow-2);max-height:86vh;overflow:auto}
.sheet-card h3{margin:0 0 8px;font-size:16px}
.profile-list{display:grid;gap:8px;margin-bottom:14px}
.profile-item{display:flex;align-items:center;gap:8px;border:1px solid var(--line);
  border-radius:var(--r-md);padding:6px 8px;background:#fff}
.profile-item.active{border-color:var(--accent);background:var(--accent-soft)}
.profile-name{flex:1;display:flex;justify-content:space-between;align-items:baseline;gap:8px;
  background:none;border:0;font:inherit;cursor:pointer;padding:6px 4px;color:var(--ink);text-align:left}
.profile-name b{font-size:14.5px}
.profile-name span{font-size:12px;color:var(--muted)}
.profile-new{display:flex;gap:8px;margin-bottom:12px}
.profile-new input{flex:1;padding:9px 12px;font-size:14px;font-family:inherit;
  border:1px solid var(--line-2);border-radius:10px;background:#fff;color:var(--ink);outline:none}
.profile-new input:focus{border-color:var(--accent-hi);box-shadow:0 0 0 3px rgba(77,125,89,.14)}
.profile-foot{display:flex;gap:8px;flex-wrap:wrap;justify-content:flex-end}