:root {
  --bg: #f6f4ef;
  --card: #ffffff;
  --ink: #2b2b33;
  --sub: #7a7a85;
  --brand: #e8613c;
  --brand-ink: #ffffff;
  --ok: #2f9e63;
  --line: #e6e2d8;
  --radius: 14px;
}
* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg); color: var(--ink);
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  font-size: 15px; line-height: 1.5;
}
a { color: inherit; text-decoration: none; }

.topbar {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; gap: 10px;
  padding: 10px 14px; background: var(--card);
  border-bottom: 1px solid var(--line);
}
.topbar .logo { font-weight: 700; font-size: 17px; }
.topbar .logo em { font-style: normal; color: var(--brand); }
.topbar .spacer { flex: 1; }
.topbar button, .topbar a.btn {
  border: 1px solid var(--line); background: var(--bg); color: var(--sub);
  border-radius: 999px; padding: 5px 12px; font-size: 13px; cursor: pointer;
}

.wrap { max-width: 980px; margin: 0 auto; padding: 12px 14px 40px; }

/* 级别选择 */
.chips { display: flex; gap: 8px; overflow-x: auto; padding: 10px 2px; }
.chip {
  flex: 0 0 auto; border: 1.5px solid var(--line); background: var(--card);
  border-radius: 999px; padding: 6px 14px; font-size: 14px; font-weight: 600;
  color: var(--sub); cursor: pointer; text-transform: uppercase;
}
.chip.on { background: var(--brand); border-color: var(--brand); color: var(--brand-ink); }
.chip small { display: block; font-size: 10px; font-weight: 400; opacity: .75; }

/* 书架网格 */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(128px, 1fr)); gap: 12px; }
.card {
  background: var(--card); border-radius: var(--radius); overflow: hidden;
  border: 1px solid var(--line); cursor: pointer; position: relative;
  transition: transform .12s ease, box-shadow .12s ease;
}
.card:active { transform: scale(.97); }
.card .cover { aspect-ratio: 3/4; width: 100%; object-fit: contain; background: #fff; display: block; }
.card .info { padding: 7px 9px 9px; }
.card .t {
  font-size: 12.5px; font-weight: 600; white-space: nowrap;
  overflow: hidden; text-overflow: ellipsis;
}
.card .m { font-size: 11px; color: var(--sub); margin-top: 2px; }
.badge {
  position: absolute; top: 7px; right: 7px; font-size: 11px; font-weight: 700;
  padding: 2px 8px; border-radius: 999px; background: var(--card); border: 1px solid var(--line);
}
.badge.done { background: var(--ok); color: #fff; border-color: var(--ok); }
.badge.reading { background: #fff3d6; border-color: #e8c96a; color: #8a6d1a; }

/* 阅读器 */
.reader { position: fixed; inset: 0; background: #17171c; z-index: 50; display: flex; flex-direction: column; }
.reader .rhead {
  display: flex; align-items: center; gap: 10px; padding: 8px 12px; color: #fff;
}
.reader .rhead .t { font-weight: 600; font-size: 14px; flex: 1;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.reader .rhead .pg { color: #b9b9c6; font-size: 13px; font-variant-numeric: tabular-nums; }
.reader .rhead button {
  background: none; border: none; color: #fff; font-size: 20px; cursor: pointer; padding: 4px 8px;
}
.pages {
  flex: 1; display: flex; overflow-x: auto; overflow-y: hidden;
  scroll-snap-type: x mandatory; -webkit-overflow-scrolling: touch;
}
.pages .pgbox {
  flex: 0 0 100%; height: 100%; scroll-snap-align: center;
  display: flex; align-items: center; justify-content: center; padding: 4px 8px 8px;
}
.pages img { max-width: 100%; max-height: 100%; object-fit: contain; border-radius: 6px; }

.rfoot {
  display: flex; align-items: center; gap: 8px; padding: 8px 12px 14px;
  background: rgba(0,0,0,.25);
}
.rfoot audio { flex: 1; height: 40px; min-width: 0; }
.rfoot .pgctl { flex: 1; display: flex; align-items: center; gap: 10px; min-width: 0; }
.pgctl .pbtn {
  flex: 0 0 auto; width: 52px; height: 44px; border: none; border-radius: 12px;
  background: var(--brand); color: #fff; font-size: 20px; cursor: pointer;
}
.pgctl .pbtn:active { transform: scale(.95); }
.pgctl .mbtn {
  flex: 0 0 auto; border: 1.5px solid rgba(255,255,255,.4); background: none; color: #d9d9e2;
  border-radius: 999px; padding: 7px 14px; font-size: 13px; cursor: pointer;
}
.rfoot .done-btn {
  border: none; background: var(--ok); color: #fff; font-weight: 700;
  border-radius: 999px; padding: 10px 16px; font-size: 14px; cursor: pointer;
  flex: 0 0 auto;
}
.done-btn:disabled { opacity: .45; }

/* 通用 */
.btn {
  display: inline-block; border: none; background: var(--brand); color: #fff;
  font-weight: 600; border-radius: 12px; padding: 11px 22px; font-size: 15px; cursor: pointer;
}
.btn.ghost { background: none; border: 1.5px solid var(--line); color: var(--sub); }
.center { text-align: center; }
.muted { color: var(--sub); }
.toast {
  position: fixed; left: 50%; bottom: 90px; transform: translateX(-50%) translateY(20px);
  background: rgba(30,30,36,.92); color: #fff; padding: 10px 18px; border-radius: 999px;
  font-size: 14px; opacity: 0; pointer-events: none; transition: all .25s ease; z-index: 99;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* 登录 */
.login-box { max-width: 340px; margin: 18vh auto 0; padding: 26px 22px;
  background: var(--card); border: 1px solid var(--line); border-radius: 18px; }
.login-box h1 { font-size: 20px; margin: 0 0 4px; }
.login-box .sub { color: var(--sub); font-size: 13px; margin-bottom: 18px; }
.login-box label { display: block; font-size: 13px; color: var(--sub); margin: 12px 0 4px; }
.login-box input {
  width: 100%; padding: 11px 12px; border: 1.5px solid var(--line); border-radius: 10px;
  font-size: 15px; background: var(--bg); color: var(--ink);
}
.login-box .err { color: #c23b3b; font-size: 13px; min-height: 18px; margin-top: 10px; }
.login-box .btn { width: 100%; margin-top: 14px; }

/* 家长页 */
table.week { width: 100%; border-collapse: collapse; background: var(--card);
  border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
table.week th, table.week td { padding: 9px 12px; text-align: left; border-bottom: 1px solid var(--line); }
table.week th { font-size: 12.5px; color: var(--sub); background: #faf8f3; }
table.week td.n { font-variant-numeric: tabular-nums; font-weight: 700; }
.lvrow { display: flex; align-items: center; gap: 10px; margin: 8px 0; }
.lvrow .id { width: 34px; font-weight: 700; text-transform: uppercase; font-size: 13px; }
.lvrow .bar { flex: 1; height: 10px; background: #ece8de; border-radius: 999px; overflow: hidden; }
.lvrow .bar i { display: block; height: 100%; background: var(--ok); border-radius: 999px; }
.lvrow .num { width: 74px; text-align: right; font-size: 12.5px; color: var(--sub);
  font-variant-numeric: tabular-nums; }
.panel { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 14px 16px; margin: 14px 0; }
.panel h3 { margin: 0 0 8px; font-size: 14.5px; }