:root{
  --blue:#2C8CF3; --blue-d:#1a72d0; --bg:#f2f5f9; --card:#fff;
  --ink:#1b2430; --ink2:#5b6b7f; --line:#e3e9f0; --ok:#18a058; --bad:#e5453a;
  --warn:#f0a020; --r:14px;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0}
body{
  font-family:"Baloo 2","975Maru SC","PingFang SC","Microsoft YaHei",sans-serif;
  background:var(--bg);color:var(--ink);font-size:16px;line-height:1.55;
  -webkit-text-size-adjust:100%;
}
a{color:var(--blue);text-decoration:none}
.wrap{max-width:960px;margin:0 auto;padding:0 16px 40px}
.wrap.narrow{max-width:720px}

/* 顶栏 */
.top{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}
.top-in{max-width:960px;margin:0 auto;padding:10px 16px;display:flex;align-items:center;gap:12px}
.brand{font-weight:700;font-size:17px;color:var(--ink);display:flex;align-items:center;gap:8px}
.brand i{width:26px;height:26px;border-radius:8px;background:var(--blue);display:inline-block;
  position:relative}
.brand i::after{content:"";position:absolute;inset:7px 6px;border-left:2px solid #fff;border-right:2px solid #fff;
  border-radius:1px}
.top .sp{flex:1}
.chip{display:inline-flex;align-items:center;gap:6px;background:#eef4fd;color:var(--blue-d);
  border-radius:999px;padding:5px 12px;font-size:14px;font-weight:600}
.chip.gold{background:#fff6e0;color:#a57100}
a.tab{color:var(--ink2);font-size:14px;padding:6px 10px;border-radius:8px}
a.tab:hover{background:#eef2f7;color:var(--ink)}

/* 卡片 */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:16px 18px;
  margin-top:14px;box-shadow:0 1px 2px rgba(20,40,70,.04)}
.card h2{font-size:15px;margin:0 0 10px;color:var(--ink2);font-weight:600;letter-spacing:.3px}
.card.tight{padding:12px 14px}

/* 当前课次大卡 */
.hero{background:linear-gradient(135deg,#2C8CF3,#4aa3ff);color:#fff;border-radius:18px;padding:20px;
  margin-top:16px;box-shadow:0 8px 24px rgba(44,140,243,.25)}
.hero .u{font-size:13px;opacity:.85;letter-spacing:.5px}
.hero .t{font-size:23px;font-weight:700;margin:4px 0 14px}
.mods{display:grid;grid-template-columns:1fr 1fr;gap:12px}
@media(max-width:520px){.mods{grid-template-columns:1fr}}
.mod{background:rgba(255,255,255,.16);border:1px solid rgba(255,255,255,.28);border-radius:14px;
  padding:14px;display:block;color:#fff;backdrop-filter:blur(2px)}
.mod:hover{background:rgba(255,255,255,.26)}
.mod .n{font-size:15px;font-weight:600}
.mod .m{font-size:13px;opacity:.9;margin-top:2px}
.mod .go{margin-top:10px;display:inline-block;background:#fff;color:var(--blue-d);font-weight:700;
  border-radius:10px;padding:8px 16px;font-size:15px;min-height:40px;line-height:24px}
.mod.done .go{background:rgba(255,255,255,.2);color:#fff}

/* 课次列表 */
.pack{display:flex;align-items:center;gap:12px;padding:12px 4px;border-bottom:1px solid var(--line)}
.pack:last-child{border-bottom:0}
.pack .idx{width:34px;height:34px;border-radius:10px;background:#eef4fd;color:var(--blue-d);
  display:flex;align-items:center;justify-content:center;font-weight:700;font-size:14px;flex:none}
.pack .nm{flex:1;min-width:0}
.pack .nm b{display:block;font-size:15px;font-weight:600}
.pack .nm span{font-size:13px;color:var(--ink2)}
.pack .st{display:flex;gap:6px;flex:none}
.dot{width:26px;height:26px;border-radius:8px;border:1px solid var(--line);display:flex;align-items:center;
  justify-content:center;font-size:13px;color:#c3ccd8;background:#fafbfd}
.dot.ok{background:#e8f8ef;border-color:#b8e6cb;color:var(--ok)}
.dot.half{background:#fff6e0;border-color:#f5dfa8;color:var(--warn)}

/* 折叠 */
details.unit{background:#fff;border:1px solid var(--line);border-radius:var(--r);margin-top:10px;overflow:hidden}
details.unit>summary{list-style:none;cursor:pointer;padding:14px 16px;display:flex;align-items:center;gap:10px;
  font-weight:600;font-size:15px}
details.unit>summary::-webkit-details-marker{display:none}
details.unit>summary::after{content:"";width:8px;height:8px;border-right:2px solid var(--ink2);
  border-bottom:2px solid var(--ink2);transform:rotate(45deg);margin-left:auto;transition:.2s}
details.unit[open]>summary::after{transform:rotate(-135deg)}
.unit-body{padding:0 8px 8px}

/* 按钮 */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:44px;padding:0 20px;
  border-radius:12px;border:1px solid transparent;background:var(--blue);color:#fff;font-size:16px;
  font-weight:600;cursor:pointer;font-family:inherit}
.btn:hover{background:var(--blue-d)}
.btn.ghost{background:#fff;color:var(--blue-d);border-color:#cfe1f7}
.btn.gray{background:#eef2f7;color:var(--ink2)}
.btn.block{width:100%}
.btn.lg{min-height:52px;font-size:17px}
.btn:disabled{opacity:.55}

/* 表单 */
input[type=text],input[type=password],textarea,select{
  width:100%;font-family:inherit;font-size:16px;padding:11px 13px;border:1px solid var(--line);
  border-radius:11px;background:#fff;color:var(--ink);outline:none;-webkit-appearance:none}
input:focus,textarea:focus,select:focus{border-color:var(--blue);box-shadow:0 0 0 3px rgba(44,140,243,.12)}
textarea{min-height:110px;line-height:1.6;resize:vertical}
label.f{display:block;font-size:13px;color:var(--ink2);margin:12px 0 6px;font-weight:600}
.msg{padding:10px 13px;border-radius:10px;font-size:14px;margin-top:12px}
.msg.ok{background:#e8f8ef;color:#0d6b3d;border:1px solid #b8e6cb}
.msg.err{background:#fdecea;color:#a0251b;border:1px solid #f5c6c1}

/* 表格 */
table.t{width:100%;border-collapse:collapse;font-size:14px}
table.t th,table.t td{padding:9px 8px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
table.t th{color:var(--ink2);font-weight:600;font-size:13px;background:#fafbfd}
table.t tr:last-child td{border-bottom:0}

/* 统计条 */
.kpis{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}
@media(max-width:560px){.kpis{grid-template-columns:repeat(2,1fr)}}
.kpi{background:#fff;border:1px solid var(--line);border-radius:12px;padding:12px;text-align:center}
.kpi b{display:block;font-size:22px;color:var(--blue-d);line-height:1.2}
.kpi span{font-size:12.5px;color:var(--ink2)}

.mut{color:var(--ink2);font-size:13.5px}
.tag{display:inline-block;font-size:12px;padding:1px 7px;border-radius:6px;background:#eef4fd;color:var(--blue-d)}
.tag.g{background:#e8f8ef;color:#0d6b3d}
.tag.r{background:#fdecea;color:#a0251b}
.tag.y{background:#fff6e0;color:#a57100}
.empty{text-align:center;color:var(--ink2);padding:26px 10px;font-size:14px}