* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  color: #171717;
  background: #f4f5f7;
}

button,
input,
select,
textarea {
  font: inherit;
}

.topbar {
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  background: #ffffff;
  border-bottom: 1px solid #d7dce2;
}

.save-status {
  margin-left: 16px;
  color: #5c6773;
  font-size: 13px;
}

.ghost {
  border: 1px solid #c9d0d8;
  background: #fff;
  padding: 7px 12px;
}

.app-shell {
  height: calc(100vh - 48px);
  display: grid;
  grid-template-columns: minmax(320px, 38vw) 1fr 320px;
  gap: 0;
}

.scan-pane,
.editor-pane,
.catalog-pane {
  min-width: 0;
  min-height: 0;
  overflow: auto;
}

.scan-pane {
  background: #e8ebef;
  border-right: 1px solid #cfd5dd;
}

.pane-title,
.catalog-title {
  position: sticky;
  top: 0;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 42px;
  padding: 0 12px;
  background: #fff;
  border-bottom: 1px solid #d7dce2;
  font-weight: 700;
}

.pane-title a {
  color: #1b5fb8;
  font-size: 13px;
  font-weight: 400;
}

.scan-pages {
  padding: 12px;
}

.scan-page {
  width: 100%;
  display: block;
  margin: 0 0 12px;
  background: #fff;
  border: 1px solid #c6ccd4;
}

.editor-pane {
  background: #fff;
}

.student-meta {
  position: sticky;
  top: 0;
  z-index: 3;
  display: grid;
  grid-template-columns: 2fr 1fr 2fr;
  gap: 10px;
  padding: 10px 12px;
  background: #fff;
  border-bottom: 1px solid #d7dce2;
}

label {
  display: grid;
  gap: 4px;
  font-size: 12px;
  color: #47515d;
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid #c5ccd5;
  background: #fff;
  padding: 7px 8px;
  color: #15191d;
}

textarea {
  resize: vertical;
}

.table-wrap {
  padding: 0 0 24px;
}

.rows-table {
  width: 100%;
  border-collapse: collapse;
  table-layout: fixed;
  font-size: 13px;
}

.rows-table th {
  position: sticky;
  top: 84px;
  z-index: 2;
  background: #f7f8fa;
  border-bottom: 1px solid #c7cdd5;
  text-align: left;
  padding: 8px;
}

.rows-table td {
  border-bottom: 1px solid #e0e4e8;
  padding: 6px 8px;
  vertical-align: top;
}

.rows-table .num {
  width: 42px;
  text-align: right;
  color: #687380;
}

.rows-table .credits {
  width: 72px;
}

.rows-table .grade {
  width: 170px;
}

.rows-table select {
  padding: 5px 6px;
}

.catalog-pane {
  background: #fff;
  border-left: 1px solid #cfd5dd;
}

.upload-form {
  display: grid;
  gap: 8px;
  padding: 12px;
  border-bottom: 1px solid #d7dce2;
}

.upload-form button,
.login-form button {
  border: 1px solid #1559aa;
  background: #1b66c9;
  color: #fff;
  padding: 8px 10px;
}

.catalog-list {
  display: grid;
}

.catalog-item {
  display: grid;
  gap: 3px;
  padding: 10px 12px;
  border-bottom: 1px solid #e1e5ea;
  color: #17202a;
  text-decoration: none;
}

.catalog-item:hover,
.catalog-item.active {
  background: #eaf2ff;
}

.catalog-item small {
  color: #687380;
  font-size: 11px;
}

.login-body {
  display: grid;
  place-items: center;
}

.login-panel {
  width: min(360px, calc(100vw - 32px));
  background: #fff;
  border: 1px solid #d7dce2;
  padding: 24px;
}

.login-panel h1 {
  margin: 0 0 18px;
  font-size: 22px;
}

.login-form {
  display: grid;
  gap: 14px;
}

.error {
  color: #b42318;
  font-size: 13px;
}

@media (max-width: 1100px) {
  .app-shell {
    grid-template-columns: 1fr;
    height: auto;
  }

  .scan-pane,
  .catalog-pane {
    max-height: 70vh;
  }

  .student-meta {
    grid-template-columns: 1fr;
  }

  .rows-table th {
    top: 0;
  }
}