:root {
  --ink: #2a1c16;
  --muted: #7a6458;
  --paper: #f4ead8;
  --card: #fffaf1;
  --line: #e2d3bf;
  --red: #8c1d20;
  --red-deep: #5c1013;
  --gold: #c4a15a;
  --done: #3d6b4f;
  --shadow: 0 12px 32px rgba(74, 42, 28, 0.08);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(140, 29, 32, 0.08), transparent 28%),
    linear-gradient(180deg, #f7efe1 0%, #efe3cf 100%);
}

.page {
  max-width: 980px;
  margin: 0 auto;
  padding: 32px 20px 56px;
  position: relative;
}

.spine {
  position: absolute;
  left: 8px;
  top: 24px;
  bottom: 24px;
  width: 6px;
  border-radius: 999px;
  background: linear-gradient(180deg, var(--red) 0%, var(--gold) 100%);
}

.hero {
  padding-left: 22px;
}

.eyebrow {
  margin: 0 0 8px;
  letter-spacing: 0.18em;
  font-size: 12px;
  color: var(--red);
}

h1 {
  font-family: "Noto Serif SC", "Songti SC", serif;
  font-size: 52px;
  line-height: 1;
  margin: 0 0 12px;
}

.lede {
  margin: 0 0 20px;
  max-width: 36em;
  color: var(--muted);
}

.stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.stat {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 14px 16px;
  box-shadow: var(--shadow);
}

.stat b {
  display: block;
  font-size: 28px;
  font-family: "Noto Serif SC", serif;
}

.stat span {
  color: var(--muted);
  font-size: 13px;
}

.tabs {
  display: flex;
  gap: 8px;
  margin: 28px 0 16px 22px;
}

.tab,
.chip,
button,
select,
input {
  font: inherit;
}

.tab {
  border: 1px solid transparent;
  background: transparent;
  color: var(--muted);
  padding: 8px 16px;
  border-radius: 999px;
  cursor: pointer;
}

.tab.is-active {
  background: var(--red);
  color: #fff8ee;
}

.panel[hidden] {
  display: none;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 22px;
  box-shadow: var(--shadow);
}

.split {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 16px;
}

h2 {
  font-family: "Noto Serif SC", serif;
  font-size: 22px;
  margin: 0 0 8px;
}

.muted {
  margin: 0 0 16px;
  color: var(--muted);
}

.course-list,
.todo-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.course-item,
.todo-item {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 12px 14px;
  background: #fff;
}

.course-item strong,
.todo-item strong {
  display: block;
}

.meta {
  color: var(--muted);
  font-size: 13px;
  margin-top: 4px;
}

.tag {
  display: inline-block;
  margin-top: 8px;
  font-size: 12px;
  padding: 2px 8px;
  border-radius: 999px;
  background: #f3e4c9;
  color: var(--red-deep);
}

.todo-item {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 10px;
  align-items: start;
}

.todo-item.is-done strong {
  text-decoration: line-through;
  color: var(--muted);
}

.todo-item button {
  border: 0;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
}

.toolbar {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: end;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.toolbar label {
  color: var(--muted);
  font-size: 13px;
  display: grid;
  gap: 6px;
}

select,
input[type="text"],
input[type="date"] {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 10px 12px;
  background: #fff;
}

.timetable {
  display: grid;
  gap: 10px;
}

.day-block h3 {
  margin: 0 0 8px;
  font-size: 15px;
}

.todo-form {
  display: grid;
  grid-template-columns: 1fr 120px 150px auto;
  gap: 8px;
  margin: 16px 0;
}

.todo-form button,
.tab.is-active {
  background: var(--red);
  color: #fff8ee;
}

.todo-form button {
  border: 0;
  border-radius: 12px;
  padding: 10px 16px;
  cursor: pointer;
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.chip {
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 999px;
  padding: 6px 12px;
  cursor: pointer;
  color: var(--muted);
}

.chip.is-on {
  border-color: var(--red);
  color: var(--red);
  background: #f8ece6;
}

.empty {
  color: var(--muted);
  padding: 18px 4px;
}

.foot {
  margin: 24px 0 0 22px;
  color: var(--muted);
  font-size: 13px;
}

@media (max-width: 760px) {
  .spine {
    display: none;
  }

  .hero,
  .tabs,
  .foot {
    padding-left: 0;
    margin-left: 0;
  }

  h1 {
    font-size: 40px;
  }

  .split,
  .todo-form,
  .stats {
    grid-template-columns: 1fr;
  }
}