:root {
  --paper: #F7F9FC;
  --card: #FFFFFF;
  --ink: #16233B;
  --ink-soft: #5A6B85;
  --line: #DBE4F2;
  --line-strong: #C6D4E8;
  --pen: #1B5EB8;
  --pen-deep: #0C3A76;
  --wash: #E6EFFB;
  --wash-soft: #F1F6FD;
  --amber: #B4661F;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  -webkit-font-smoothing: antialiased;
}

body { padding: 28px 20px 40px; }

.sheet {
  max-width: 1080px;
  margin: 0 auto;
}

/* ---------- 顶部：周次 ---------- */

.head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line-strong);
}

.week { display: flex; align-items: flex-end; gap: 12px; }

.week__num {
  font-size: 54px;
  line-height: 1;
  font-weight: 500;
  letter-spacing: -2px;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.week__meta {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-bottom: 6px;
  font-size: 13px;
  color: var(--ink-soft);
}

.week__meta > span:first-child { color: var(--ink); font-weight: 500; }
.week__sub { font-size: 12px; color: var(--ink-soft); }

.head__right { display: flex; gap: 6px; padding-bottom: 6px; }

.ghost {
  appearance: none;
  border: 1px solid var(--line-strong);
  background: var(--card);
  color: var(--pen-deep);
  font: inherit;
  font-size: 13px;
  padding: 6px 12px;
  border-radius: 3px;
  cursor: pointer;
}

.ghost:hover { background: var(--wash-soft); border-color: var(--pen); }
.ghost:focus-visible { outline: 2px solid var(--pen); outline-offset: 1px; }

/* ---------- 现在 / 下一节 ---------- */

.now {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 12px 2px;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
}

.now__clock {
  font-variant-numeric: tabular-nums;
  color: var(--pen);
  font-weight: 600;
  font-size: 15px;
  min-width: 52px;
}

.now__text { color: var(--ink); }
.now__text strong { font-weight: 600; }
.now__text em { font-style: normal; color: var(--ink-soft); }

/* ---------- 课表网格 ---------- */

.grid {
  display: grid;
  grid-template-columns: 64px repeat(var(--days, 5), minmax(0, 1fr));
  grid-auto-rows: minmax(52px, auto);
  margin-top: 16px;
  border: 1px solid var(--line-strong);
  border-right: none;
  border-bottom: none;
  background: var(--card);
  position: relative;
}

.cell {
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  min-height: 52px;
}

.cell--head {
  min-height: 0;
  padding: 8px 6px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  background: var(--wash-soft);
  border-bottom: 1px solid var(--line-strong);
}

.cell--head .dow { font-size: 13px; font-weight: 600; color: var(--ink); }
.cell--head .date { font-size: 11px; color: var(--ink-soft); font-variant-numeric: tabular-nums; }

.cell--head.is-today {
  background: var(--pen);
  border-bottom-color: var(--pen);
}

.cell--head.is-today .dow,
.cell--head.is-today .date { color: #FFFFFF; }

.cell--period {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  background: var(--wash-soft);
}

.cell--period .idx { font-size: 13px; font-weight: 600; color: var(--ink); font-variant-numeric: tabular-nums; }
.cell--period .time { font-size: 10px; color: var(--ink-soft); font-variant-numeric: tabular-nums; letter-spacing: -0.2px; }
.cell--period .section-tag { font-size: 10px; color: var(--pen); }

.cell--col-today { background: #FBFDFF; }

.cell--period.is-now { background: var(--wash); }
.cell--col-now { background: var(--wash-soft); }

/* 一门课 */
.course {
  margin: 3px;
  padding: 5px 7px;
  background: var(--wash);
  border: 1px solid var(--line-strong);
  border-left: 3px solid var(--pen);
  border-radius: 2px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: 2px;
  font-size: 12px;
  line-height: 1.35;
}

.course.is-now {
  background: #D8E7FB;
  border-left-color: var(--pen-deep);
}

.course__name { font-weight: 600; color: var(--ink); }
.course__room { color: var(--ink-soft); font-size: 11px; }
.course__teacher { color: var(--ink-soft); font-size: 11px; }

/* ---------- 实践环节 ---------- */

.practice { margin-top: 22px; }

.practice__title {
  margin: 0 0 8px;
  font-size: 12px;
  font-weight: 500;
  color: var(--ink-soft);
  letter-spacing: 0.3px;
}

.practice__list { margin: 0; padding: 0; list-style: none; }

.practice__list li {
  padding: 10px 2px;
  border-top: 1px solid var(--line);
  font-size: 14px;
  display: flex;
  gap: 10px;
  align-items: baseline;
  flex-wrap: wrap;
}

.practice__list .p-name { font-weight: 600; }
.practice__list .p-meta { color: var(--ink-soft); font-size: 12px; }

/* ---------- 页脚 ---------- */

.foot {
  margin-top: 26px;
  padding-top: 10px;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  font-size: 11px;
  color: var(--ink-soft);
}

.foot code { font-size: 11px; color: var(--pen-deep); }

/* ---------- 手机：今日视图 ---------- */

.only-mobile { display: none; }

.daylist { display: none; margin-top: 14px; }

.daylist__title {
  margin: 0 0 4px;
  font-size: 12px;
  font-weight: 500;
  color: var(--ink-soft);
  letter-spacing: 0.3px;
}

.daylist__items { margin: 0; padding: 0; list-style: none; }

.daylist__items li {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 10px;
  padding: 14px 2px;
  border-bottom: 1px solid var(--line);
}

.daylist__items li.is-now {
  background: var(--wash);
  border-left: 3px solid var(--pen);
  padding-left: 8px;
  margin-left: -8px;
}

.daylist__time {
  font-size: 12px;
  color: var(--pen);
  font-variant-numeric: tabular-nums;
  line-height: 1.5;
}

.daylist__time .idx { display: block; font-weight: 600; }
.daylist__time .span { display: block; color: var(--ink-soft); font-size: 11px; }

.daylist__name { font-weight: 600; font-size: 15px; line-height: 1.4; }
.daylist__meta { font-size: 12px; color: var(--ink-soft); margin-top: 3px; }

.daylist__empty {
  margin: 16px 2px;
  font-size: 14px;
  color: var(--ink-soft);
}

@media (max-width: 760px) {
  .only-mobile { display: inline-block; }
  .only-desktop { display: none; }
  body.show-grid .only-desktop { display: inline-block; }
  .daylist { display: block; }
  .table-scroll { display: none; }
  body.show-grid .daylist { display: none; }
  body.show-grid .table-scroll { display: block; }
  .foot { font-size: 12px; }
}

/* ---------- 小屏 ---------- */

@media (max-width: 760px) {
  body { padding: 18px 12px 28px; }
  .week__num { font-size: 42px; }
  .grid { min-width: var(--grid-min, 600px); }
  .table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }
  .course__teacher { display: none; }
  .cell--period .section-tag { display: none; }
}

@media (prefers-reduced-motion: no-preference) {
  .course { transition: background 160ms ease; }
}