/* ============ 基础 / 移动端优先 ============ */
:root{
  --bg:#f5f7fa; --card:#ffffff; --ink:#23303a; --sub:#6b7a86;
  --brand:#2bb3a3; --brand-d:#1f8c80; --accent:#ff8a4c;
  --line:#e6ebef; --ok:#27ae60; --warn:#e67e22; --danger:#e74c3c;
  --radius:16px; --shadow:0 2px 10px rgba(30,50,60,.08);
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0}
body{
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",Segoe UI,Roboto,sans-serif;
  background:var(--bg); color:var(--ink); font-size:15px; line-height:1.5;
  padding-bottom:74px; /* 给底部导航留位 */
}
.wrap{max-width:520px;margin:0 auto;padding:12px}
header.app{
  position:sticky;top:0;z-index:30;background:linear-gradient(135deg,var(--brand),var(--brand-d));
  color:#fff;padding:14px 16px;box-shadow:var(--shadow)
}
header.app h1{margin:0;font-size:18px;font-weight:700;letter-spacing:.5px}
header.app p{margin:2px 0 0;font-size:12px;opacity:.9}
section.view{display:none}
section.view.active{display:block}

/* ============ 卡片 / 通用 ============ */
.card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:14px;margin-bottom:12px}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:6px;
  border:none;border-radius:12px;padding:11px 14px;font-size:15px;font-weight:600;
  background:var(--brand);color:#fff;cursor:pointer;width:100%;transition:.15s
}
.btn:active{transform:scale(.98)}
.btn.sec{background:#eef3f5;color:var(--ink)}
.btn.ghost{background:transparent;color:var(--brand);border:1.5px solid var(--brand)}
.btn.warn{background:var(--accent);color:#fff}
.btn.sm{width:auto;padding:7px 12px;font-size:13px;border-radius:10px}
.btn[disabled]{opacity:.5;cursor:not-allowed}
input,textarea,select{
  width:100%;border:1.5px solid var(--line);border-radius:10px;padding:10px 12px;
  font-size:15px;font-family:inherit;background:#fff;color:var(--ink)
}
input:focus,textarea:focus,select:focus{outline:none;border-color:var(--brand)}
label.lab{display:block;font-size:13px;color:var(--sub);margin:10px 0 5px;font-weight:600}
.row{display:flex;gap:8px;align-items:center}
.row>*{flex:1}
.hint{font-size:12px;color:var(--sub);margin-top:4px}
.tag{display:inline-block;background:#eafaf7;color:var(--brand-d);border-radius:999px;
  padding:2px 10px;font-size:12px;margin:2px 4px 2px 0}
.pill{display:inline-block;background:#f0f3f5;color:var(--sub);border-radius:999px;padding:3px 10px;font-size:12px}

/* ============ 底部导航 ============ */
nav.bottom{
  position:fixed;left:0;right:0;bottom:0;z-index:40;
  display:flex;background:#fff;border-top:1px solid var(--line);
  max-width:520px;margin:0 auto;box-shadow:0 -2px 10px rgba(0,0,0,.05)
}
nav.bottom button{
  flex:1;border:none;background:none;padding:9px 0 7px;font-size:11px;color:var(--sub);
  display:flex;flex-direction:column;align-items:center;gap:3px;cursor:pointer
}
nav.bottom button .ico{font-size:20px;line-height:1}
nav.bottom button.active{color:var(--brand);font-weight:700}

/* ============ 课件库 ============ */
.searchbar{display:flex;gap:8px;margin-bottom:10px}
.lib-item{display:flex;justify-content:space-between;align-items:center;gap:10px;
  padding:12px;border:1px solid var(--line);border-radius:12px;margin-bottom:8px;background:#fff;cursor:pointer}
.lib-item:active{background:#f0faf8}
.lib-item .id{font-weight:700;color:var(--brand-d);font-size:14px}
.lib-item .meta{font-size:12px;color:var(--sub);margin-top:2px}
.lib-item .arrow{color:#c4ced4;font-size:18px}
.empty{text-align:center;color:var(--sub);padding:40px 0;font-size:14px}

/* ============ 生成器 ============ */
.words-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.word-cell{border:1px solid var(--line);border-radius:10px;padding:8px;position:relative}
.word-cell .en{font-weight:700;font-size:15px}
.word-cell .zh{font-size:12px;color:var(--sub)}
.word-cell .x{position:absolute;top:4px;right:6px;color:var(--danger);cursor:pointer;font-size:16px;font-weight:700}
.sent-cell{border:1px solid var(--line);border-radius:10px;padding:10px;margin-bottom:8px;position:relative}
.sent-cell .q{font-weight:600}
.sent-cell .a{color:var(--brand-d)}
.sent-cell .zh{font-size:12px;color:var(--sub)}
.sent-cell .x{position:absolute;top:6px;right:8px;color:var(--danger);cursor:pointer;font-weight:700}
.chip{display:inline-flex;align-items:center;gap:4px;border:1.5px solid var(--line);
  border-radius:12px;padding:7px 11px;margin:4px 5px 0 0;font-size:13px;cursor:pointer;background:#fff}
.chip.on{border-color:var(--brand);background:#eafaf7;color:var(--brand-d);font-weight:600}
.chip .x{color:var(--danger);margin-left:2px}
.step-h{font-weight:700;margin:14px 0 6px;display:flex;align-items:center;gap:8px}
.step-h .n{background:var(--brand);color:#fff;width:22px;height:22px;border-radius:50%;
  display:inline-flex;align-items:center;justify-content:center;font-size:13px}

/* ============ 详情 / 弹层 ============ */
.overlay{position:fixed;inset:0;background:rgba(20,30,35,.55);z-index:60;display:none;overflow:auto}
.overlay.show{display:block}
.sheet{background:#fff;max-width:520px;margin:0 auto;min-height:100%;padding:18px 16px 90px}
.sheet h2{margin:0 0 4px;font-size:20px}
.sheet .id-pill{color:var(--brand-d);font-weight:700}
.sec-title{font-weight:700;margin:18px 0 8px;color:var(--brand-d);border-left:4px solid var(--brand);padding-left:8px}
.dl-actions{position:fixed;left:0;right:0;bottom:0;background:#fff;border-top:1px solid var(--line);
  padding:10px 12px;display:flex;gap:8px;max-width:520px;margin:0 auto;z-index:70}
.dl-actions .btn{margin:0}
#imgCard{max-width:100%;border-radius:12px;border:1px solid var(--line);margin-top:10px;display:none}
#printArea{display:none}

/* ============ 游戏库 ============ */
.game-card{border:1px solid var(--line);border-radius:12px;padding:12px;margin-bottom:10px;background:#fff}
.game-card h4{margin:0 0 4px;font-size:15px}
.game-card .en{color:var(--sub);font-size:12px;font-weight:400}
.game-card .rules{font-size:13px;color:var(--ink);margin:6px 0}
.game-card .meta{font-size:12px;color:var(--sub)}
.game-card .meta .en{color:#9aa6ae;font-size:11px}
.gc-head{display:flex;justify-content:space-between;align-items:flex-start;gap:8px;margin-bottom:2px}
.gc-head h4{margin:0}
.btn.xs{width:auto;padding:4px 10px;font-size:12px;border-radius:8px;flex:0 0 auto}

/* ============ 签到 ============ */
.att-day{display:flex;gap:6px;flex-wrap:wrap;margin:8px 0}
.stu-chip{display:flex;align-items:center;gap:6px;border:1.5px solid var(--line);border-radius:12px;
  padding:7px 11px;font-size:13px;cursor:pointer;background:#fff}
.stu-chip.p{background:#eafaf7;border-color:var(--brand);color:var(--brand-d)}
.stu-chip.a{background:#fdecea;border-color:var(--danger);color:var(--danger)}
.soon{background:#fff7ed;border:1px dashed var(--accent);color:var(--warn);border-radius:12px;padding:14px;font-size:13px}

/* ============ 打印 ============ */
@media print{
  body{background:#fff;padding:0}
  header.app,nav.bottom,.wrap>section:not(.active),.dl-actions,.overlay{display:none!important}
  #printArea{display:block!important;padding:0}
  .print-card{border:1px solid #333;padding:18px;margin:0;font-size:13px}
  .print-card h1{font-size:22px;margin:0 0 4px}
  .print-words{display:grid;grid-template-columns:1fr 1fr 1fr 1fr;gap:6px;margin:8px 0}
  .print-words div{border:1px solid #999;padding:6px;border-radius:6px}
}