:root {
  --red: #d93025;
  --red-dark: #b3261e;
  --orange: #ef6c00;
  --orange-dark: #c45f00;
  --purple: #8e24aa;
  --purple-dark: #701a88;
  --blue: #1e73be;
  --blue-dark: #175f9e;
  --ink: #222;
  --muted: #777;
  --line: #e5e7eb;
  --bg: #f2f4f7;
  --card: #ffffff;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  background: var(--bg);
  color: var(--ink);
  max-width: 680px;
  margin: 0 auto;
  padding-bottom: 40px;
}

.top {
  background: linear-gradient(135deg, #8b0000, #b3261e);
  color: #fff;
  text-align: center;
  padding: 18px 12px 14px;
  position: sticky;
  top: 0;
  z-index: 20;
  box-shadow: 0 2px 8px rgba(0,0,0,.18);
}
.top h1 { font-size: 20px; font-weight: 700; letter-spacing: 2px; }
.top .sub { font-size: 12px; opacity: .85; margin-top: 3px; }

.datebar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--card);
  margin: 12px;
  border-radius: 12px;
  padding: 10px 12px;
  box-shadow: 0 1px 4px rgba(0,0,0,.08);
  position: relative;
}
.navbtn {
  width: 44px; height: 44px;
  border: none; border-radius: 10px;
  background: #f0f1f3;
  font-size: 26px; color: var(--ink);
  cursor: pointer;
  flex: none;
  position: relative;
  z-index: 2;
}
.navbtn:active { background: #dfe1e5; }
.datecenter { text-align: center; flex: 1; position: relative; z-index: 2; cursor: pointer; }
.datecenter:active { opacity: .7; }
.date-main { font-size: 19px; font-weight: 700; }
.date-sub { font-size: 13px; color: var(--muted); margin-top: 2px; }
.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 0 12px 4px;
}
.lg {
  font-size: 12px;
  padding: 4px 10px;
  border-radius: 999px;
  color: #fff;
}
.lg-red { background: var(--red); }
.lg-orange { background: var(--orange); }
.lg-purple { background: var(--purple); }
.lg-blue { background: var(--blue); }

#content { padding: 8px 12px; }
.loading { text-align: center; color: var(--muted); padding: 40px 0; font-size: 14px; }

.building {
  margin-top: 14px;
}
.building-head {
  background: var(--card);
  border-left: 5px solid #8b0000;
  border-radius: 10px;
  padding: 10px 14px;
  font-size: 17px;
  font-weight: 700;
  box-shadow: 0 1px 4px rgba(0,0,0,.08);
}
.building-head .cnt { font-size: 12px; font-weight: 400; color: var(--muted); margin-left: 8px; }

.rooms { display: flex; flex-direction: column; gap: 10px; margin-top: 10px; }

.room {
  background: var(--card);
  border-radius: 12px;
  padding: 12px 14px;
  box-shadow: 0 1px 4px rgba(0,0,0,.08);
}
.room-head {
  display: flex; align-items: center; gap: 8px;
  margin-bottom: 10px;
}
.room-name { font-size: 17px; font-weight: 700; }
.floor-chip {
  font-size: 11px; color: #555;
  background: #eef0f3;
  padding: 2px 8px; border-radius: 999px;
}

.slots { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.slot-cell {
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
  min-height: 86px;
  display: flex; flex-direction: column;
}
.slot-label {
  background: #f7f8fa;
  font-size: 12px;
  color: #444;
  padding: 4px 8px;
  border-bottom: 1px solid var(--line);
  display: flex; justify-content: space-between; align-items: center;
}
.slot-label em { font-style: normal; color: var(--muted); font-size: 11px; }
.slot-body { flex: 1; padding: 6px 8px; font-size: 12.5px; }
.slot-body.free { color: #b0b3b8; display: flex; align-items: center; justify-content: center; font-size: 12px; }

.slot-body.book { color: #fff; }
.book .s-class { font-size: 14px; font-weight: 700; line-height: 1.35; }
.book .s-meta { font-size: 12px; opacity: .95; margin-top: 2px; line-height: 1.4; }
.book .s-note { font-size: 11px; opacity: .85; margin-top: 3px; }
.book .badge {
  display: inline-block;
  background: #fff;
  color: var(--purple-dark);
  font-size: 10.5px;
  font-weight: 700;
  padding: 1px 6px;
  border-radius: 4px;
  margin-bottom: 3px;
}
.book.extra + .book.extra { border-top: 1px dashed rgba(255,255,255,.5); padding-top: 5px; margin-top: 5px; }

.book.red { background: linear-gradient(160deg, var(--red), var(--red-dark)); }
.book.orange { background: linear-gradient(160deg, var(--orange), var(--orange-dark)); }
.book.purple { background: linear-gradient(160deg, var(--purple), var(--purple-dark)); }
.book.blue { background: linear-gradient(160deg, var(--blue), var(--blue-dark)); }

.foot {
  text-align: center;
  margin-top: 26px;
  font-size: 12px;
  color: var(--muted);
}
.foot a { color: #999; text-decoration: none; }
.foot a:active { color: var(--ink); }

.empty-tip {
  text-align: center; color: var(--muted);
  background: var(--card); border-radius: 12px;
  padding: 34px 16px; margin-top: 14px;
  font-size: 14px; box-shadow: 0 1px 4px rgba(0,0,0,.08);
}