:root {
  color-scheme: light;
  --main-bg-color: #f8f7f3;
  --paper: #fffdfa;
  --paper-strong: #ffffff;
  --ink: #202124;
  --muted: #6a6760;
  --faint: #8a867c;
  --line: #d8d3c9;
  --soft-line: #ece7de;
  --link-color: #0b57d0;
  --page-max: 1120px;
  --shell-max: 1200px;
  --page-gutter: clamp(18px, 4vw, 40px);
  --font-family-sans: -apple-system, BlinkMacSystemFont, avenir next, avenir, segoe ui, helvetica neue, Adwaita Sans, Cantarell, Ubuntu, roboto, noto, helvetica, arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-family-serif: Iowan Old Style, Apple Garamond, Baskerville, Times New Roman, Droid Serif, Times, Source Serif Pro, "Songti SC", "STSong", SimSun, serif, Apple Color Emoji, Segoe UI Emoji, Segoe UI Symbol;
  --font-family-mono: Menlo, Consolas, Monaco, Adwaita Mono, Liberation Mono, Lucida Console, monospace;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--main-bg-color);
}

body {
  min-height: 100vh;
  margin: 0;
  background: var(--main-bg-color);
  color: var(--ink);
  font-family: var(--font-family-sans);
  line-height: 1.55;
}

a {
  color: var(--link-color);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

h1,
h2 {
  font-family: var(--font-family-serif);
  font-weight: 700;
}

h1,
h2,
p {
  margin-top: 0;
}

.topbar {
  background: rgba(255, 253, 250, 0.92);
  border-bottom: 1px solid var(--line);
}

.topbar-inner {
  align-items: center;
  display: flex;
  gap: 24px;
  justify-content: space-between;
  margin: 0 auto;
  max-width: var(--shell-max);
  min-height: 66px;
  padding: 14px var(--page-gutter);
  width: 100%;
}

.brand {
  align-items: baseline;
  color: var(--ink);
  display: flex;
  flex-wrap: wrap;
  font-family: var(--font-family-serif);
  font-size: clamp(18px, 1.8vw, 22px);
  gap: 9px;
  font-weight: 700;
  line-height: 1.18;
  overflow-wrap: anywhere;
}

.brand:hover {
  text-decoration: none;
}

.brand-school {
  color: var(--link-color);
}

.brand-site {
  border-left: 1px solid var(--line);
  color: var(--ink);
  padding-left: 10px;
}

.topnav {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: flex-end;
}

.topnav a {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.3;
  padding: 2px 0;
}

.topnav a:hover {
  color: var(--link-color);
}

main {
  margin: 0 auto;
  max-width: var(--shell-max);
  padding: 30px var(--page-gutter) 68px;
  width: 100%;
}

.hero {
  background: var(--paper);
  border: 1px solid var(--line);
  display: grid;
  gap: clamp(24px, 4vw, 36px);
  grid-template-columns: minmax(0, 1fr) 280px;
  margin-bottom: 22px;
  padding: clamp(26px, 4vw, 38px);
}

.hero-copy {
  max-width: 760px;
}

.eyebrow {
  background: #eef4fb;
  border: 1px solid #d7e4f5;
  color: #245c91;
  display: inline-block;
  font-family: var(--font-family-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0;
  margin: 0 0 12px;
  padding: 3px 8px;
}

h1 {
  font-size: clamp(42px, 5vw, 66px);
  line-height: 1.08;
  margin-bottom: 14px;
  max-width: 760px;
  text-wrap: balance;
}

h1 span {
  display: block;
  white-space: nowrap;
}

.hero-lede {
  color: var(--ink);
  font-family: var(--font-family-serif);
  font-size: clamp(19px, 2vw, 24px);
  line-height: 1.38;
  margin-bottom: 0;
  max-width: 680px;
}

.index-status {
  align-self: stretch;
  border-left: 1px solid var(--line);
  display: grid;
  grid-template-rows: repeat(3, 1fr);
  padding-left: 24px;
}

.index-status div {
  --stat-color: var(--link-color);
  border-bottom: 1px solid var(--soft-line);
  display: grid;
  gap: 2px;
  grid-template-columns: 1fr auto;
  padding: 4px 0 16px;
}

.index-status div:nth-child(2) {
  --stat-color: #7a5a1b;
}

.index-status div:nth-child(3) {
  --stat-color: #4f6a50;
}

.index-status div:last-child {
  border-bottom: 0;
}

.index-status span {
  color: var(--stat-color);
  font-family: var(--font-family-mono);
  font-size: 15px;
  font-weight: 700;
  grid-column: 1 / -1;
}

.index-status strong {
  font-family: var(--font-family-serif);
  font-size: 38px;
  line-height: 1;
}

.index-status small {
  align-self: end;
  color: var(--muted);
  font-size: 14px;
  padding-bottom: 3px;
}

.search-section {
  background: var(--paper);
  border: 1px solid var(--line);
  margin-bottom: 22px;
  padding: 22px 24px 24px;
}

.section-head {
  align-items: baseline;
  border-bottom: 1px solid var(--soft-line);
  display: flex;
  gap: 16px;
  justify-content: space-between;
  margin-bottom: 18px;
  padding-bottom: 12px;
}

.section-head h2,
.panel-head h2 {
  font-size: 24px;
  line-height: 1.1;
  margin: 0;
}

.section-head span,
.panel-head span {
  color: var(--muted);
  font-size: 14px;
}

.searchbar {
  align-items: start;
  display: grid;
  column-gap: 24px;
  grid-template-columns: minmax(0, 1fr) 200px;
  row-gap: 6px;
}

.searchbar label {
  color: var(--link-color);
  font-family: var(--font-family-mono);
  font-size: 15px;
  font-weight: 700;
  line-height: 1.2;
}

.searchbar label[for="search-input"] {
  color: #245c91;
  grid-column: 1 / -1;
}

#search-input {
  font-size: 18px;
  grid-column: 1 / -1;
  margin-bottom: 8px;
}

#category-filter,
#sort-select {
  grid-row: 4;
}

.searchbar label[for="category-filter"] {
  color: #7a5a1b;
  grid-column: 1;
  grid-row: 3;
  margin-top: 2px;
}

#category-filter {
  grid-column: 1;
}

.searchbar label[for="sort-select"] {
  color: #4f6a50;
  grid-column: 2;
  grid-row: 3;
  margin-top: 2px;
}

#sort-select {
  grid-column: 2;
}

input,
select,
button {
  border-radius: 4px;
  font: inherit;
}

input,
select {
  background: var(--paper-strong);
  border: 1px solid var(--line);
  color: var(--ink);
  min-height: 46px;
  padding: 10px 12px;
  width: 100%;
}

input::placeholder {
  color: var(--faint);
}

input:focus,
select:focus,
button:focus-visible,
a:focus-visible {
  outline: 3px solid rgba(11, 87, 208, 0.18);
  outline-offset: 2px;
}

.layout {
  align-items: start;
  display: grid;
  gap: 24px;
  grid-template-columns: 300px minmax(0, 1fr);
}

.course-panel,
.resource-panel {
  min-width: 0;
}

.course-panel {
  background: var(--paper);
  border: 1px solid var(--line);
  padding: 18px;
  position: sticky;
  top: 18px;
}

.resource-panel {
  background: var(--paper);
  border: 1px solid var(--line);
  padding: 18px;
}

.panel-head {
  align-items: center;
  border-bottom: 1px solid var(--soft-line);
  display: flex;
  gap: 12px;
  justify-content: space-between;
  margin-bottom: 12px;
  padding-bottom: 12px;
}

#clear-button,
.more-button {
  background: transparent;
  border: 1px solid var(--line);
  color: var(--muted);
  cursor: pointer;
  padding: 7px 10px;
}

#clear-button:hover,
.more-button:hover {
  border-color: var(--link-color);
  color: var(--link-color);
}

.course-list,
.resource-list {
  display: grid;
}

.course-card {
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--soft-line);
  color: var(--ink);
  cursor: pointer;
  padding: 10px 0;
  text-align: left;
  width: 100%;
}

.course-card:hover,
.course-card.active {
  color: var(--link-color);
}

.course-card.active .course-title {
  text-decoration: underline;
}

.course-title,
.resource-title {
  font-weight: 700;
  overflow-wrap: anywhere;
}

.course-meta,
.resource-meta {
  color: var(--muted);
  display: flex;
  flex-wrap: wrap;
  font-size: 13px;
  gap: 8px;
  margin-top: 5px;
}

.resource-card {
  background: transparent;
  border-bottom: 1px solid var(--soft-line);
  display: grid;
  gap: 8px;
  padding: 15px 0;
}

.resource-card:first-child {
  padding-top: 2px;
}

.resource-main {
  align-items: start;
  display: grid;
  gap: 14px;
  grid-template-columns: minmax(0, 1fr) auto;
}

.resource-title {
  font-size: 17px;
  line-height: 1.36;
}

.tag {
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  padding: 1px 8px;
}

.resource-card[data-category="历年试题"] .tag {
  border-color: #d9c9c4;
}

.resource-card[data-category="作业"] .tag {
  border-color: #ddd0b5;
}

.resource-card[data-category="教材"] .tag {
  border-color: #c5d0e5;
}

.resource-actions {
  display: flex;
  gap: 8px;
}

.resource-actions a {
  border: 1px solid var(--line);
  border-radius: 4px;
  color: var(--link-color);
  font-size: 14px;
  padding: 6px 9px;
  white-space: nowrap;
}

.resource-actions a:hover {
  border-color: var(--link-color);
  text-decoration: none;
}

.empty {
  border: 1px dashed var(--line);
  color: var(--muted);
  padding: 24px;
  text-align: center;
}

.more-button {
  display: none;
  margin: 18px auto 0;
}

.more-button.visible {
  display: block;
}

@media (max-width: 900px) {
  .topbar-inner {
    align-items: flex-start;
    flex-direction: column;
  }

  .hero,
  .layout,
  .searchbar {
    grid-template-columns: 1fr;
  }

  .index-status {
    border-left: 0;
    border-top: 1px solid var(--line);
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: none;
    padding-left: 0;
    padding-top: 16px;
  }

  .index-status div {
    border-bottom: 0;
    border-right: 1px solid var(--soft-line);
    padding: 0 14px 0 0;
  }

  .index-status div:last-child {
    border-right: 0;
  }

  .course-panel {
    position: static;
  }

  .searchbar label[for="category-filter"],
  .searchbar label[for="sort-select"],
  #category-filter,
  #sort-select {
    grid-column: auto;
    grid-row: auto;
  }
}

@media (max-width: 600px) {
  .topbar-inner {
    min-height: auto;
    padding-bottom: 16px;
    padding-top: 16px;
  }

  main {
    padding-top: 24px;
  }

  .hero,
  .search-section,
  .course-panel,
  .resource-panel {
    padding: 18px;
  }

  h1 {
    font-size: clamp(30px, 9vw, 36px);
  }

  .hero-lede {
    font-size: 21px;
  }

  .index-status {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .index-status div {
    border-bottom: 1px solid var(--soft-line);
    border-right: 0;
    padding: 0 0 10px;
  }

  .index-status div:last-child {
    border-bottom: 0;
  }

  .section-head,
  .panel-head,
  .resource-main {
    align-items: flex-start;
    flex-direction: column;
    grid-template-columns: 1fr;
  }

  .topnav {
    justify-content: flex-start;
  }
}