:root {
  --main-color: #0f91d6;
  --main-dark: #0874ad;
  --page: #f4f2f2;
  --paper: #ffffff;
  --line: #e1e7ec;
  --ink: #20252a;
  --muted: #6f7881;
  --soft-blue: #eaf6fd;
}

* {
  box-sizing: border-box;
}

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

body {
  background: var(--page);
  color: var(--ink);
  display: flex;
  font-family: "Rubik", Arial, sans-serif;
  letter-spacing: 0;
}

.file-warning {
  display: none;
}

.file-mode .file-warning {
  background: #fff3cd;
  border-bottom: 1px solid #e7d48a;
  color: #4f3d00;
  display: block;
  font: 14px Arial, sans-serif;
  left: 0;
  padding: 10px 14px;
  position: fixed;
  right: 0;
  top: 0;
  z-index: 9999;
}

button,
input,
select {
  font: inherit;
}

.sidebar {
  background: var(--main-color);
  color: #ffffff;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  padding: 34px 26px 24px;
  width: 292px;
}

.brand {
  align-items: center;
  background: #ffffff;
  border-radius: 8px;
  display: flex;
  justify-content: center;
  min-height: 92px;
  padding: 18px;
}

.brand img {
  max-width: 210px;
  width: 100%;
}

.nav {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 34px;
}

.nav-link {
  border-radius: 7px;
  color: #ffffff;
  opacity: 0.75;
  padding: 12px 14px;
  text-decoration: none;
}

.nav-link.active,
.nav-link:hover {
  background: #ffffff20;
  opacity: 1;
}

.sidebar-footer {
  border-top: 1px solid #ffffff38;
  color: #ffffffcc;
  font-size: 12px;
  line-height: 1.45;
  margin-top: auto;
  padding-top: 18px;
}

.page {
  display: flex;
  flex: 1;
  flex-direction: column;
  min-width: 0;
  padding: 28px;
}

.topbar {
  align-items: flex-start;
  display: flex;
  gap: 18px;
  justify-content: space-between;
  margin-bottom: 18px;
}

.eyebrow {
  color: var(--main-dark);
  font-size: 13px;
  font-weight: 600;
  margin: 0 0 7px;
}

h1,
h2 {
  color: #4d545a;
  font-weight: 500;
  line-height: 1.2;
  margin: 0;
}

h1 {
  font-size: 30px;
}

h2 {
  font-size: 24px;
}

.icon-button,
.button {
  align-items: center;
  background: var(--main-color);
  border: 0;
  border-radius: 7px;
  color: #ffffff;
  cursor: pointer;
  display: inline-flex;
  font-weight: 500;
  justify-content: center;
  min-height: 42px;
  padding: 0 16px;
  transition: background 0.15s, transform 0.15s;
  white-space: nowrap;
}

.icon-button {
  aspect-ratio: 1;
  font-size: 22px;
  padding: 0;
  width: 44px;
}

.button:hover,
.icon-button:hover {
  background: var(--main-dark);
}

.controls {
  display: grid;
  gap: 12px;
  grid-template-columns: minmax(160px, 0.8fr) minmax(220px, 1fr) auto;
  margin-bottom: 18px;
}

.control,
.search {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 8px;
  display: grid;
  gap: 5px;
  padding: 10px 12px;
}

.control span,
.search span {
  color: var(--muted);
  font-size: 12px;
}

.control select,
.search input {
  background: transparent;
  border: 0;
  color: var(--ink);
  outline: 0;
  width: 100%;
}

.workspace {
  display: grid;
  flex: 1;
  gap: 18px;
  grid-template-columns: 360px minmax(0, 1fr);
  min-height: 0;
}

.panel {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 8px;
  min-height: 0;
}

.index-panel {
  display: flex;
  flex-direction: column;
  gap: 12px;
  overflow: hidden;
  padding: 16px;
}

.tabs,
.week-tabs {
  background: #eef3f6;
  border-radius: 8px;
  display: grid;
  gap: 4px;
  grid-template-columns: repeat(auto-fit, minmax(108px, 1fr));
  padding: 4px;
  width: 100%;
}

.tab,
.week-tab {
  background: transparent;
  border: 0;
  border-radius: 6px;
  color: #44515b;
  cursor: pointer;
  min-height: 34px;
  min-width: 0;
  padding: 0 8px;
  white-space: nowrap;
}

.tab.active,
.week-tab.active {
  background: var(--main-color);
  color: #ffffff;
  font-weight: 600;
}

.status {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.4;
}

.entity-list {
  display: flex;
  flex: 1;
  flex-direction: column;
  gap: 8px;
  min-height: 0;
  overflow: auto;
}

.entity-row {
  background: #ffffff;
  border: 1px solid #e0e7ec;
  border-radius: 7px;
  color: #27323a;
  cursor: pointer;
  display: grid;
  gap: 4px;
  padding: 10px 12px;
  text-align: left;
}

.entity-row:hover,
.entity-row.active {
  background: var(--soft-blue);
  border-color: #b7daee;
}

.entity-name {
  font-weight: 600;
}

.entity-count {
  color: var(--muted);
  font-size: 12px;
}

.schedule-panel {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.schedule-head {
  border-bottom: 1px solid var(--line);
  padding: 18px;
}

.schedule-content {
  flex: 1;
  overflow: auto;
  padding: 18px;
}

.empty-state,
.notice {
  background: #f8fbfd;
  border: 1px solid #d9e7ef;
  border-radius: 8px;
  color: #53606a;
  padding: 16px;
}

.day-card {
  background: #ffffff;
  border: 1px solid #d8e3ea;
  border-radius: 8px;
  margin-bottom: 14px;
  overflow: hidden;
}

.day-card h3 {
  background: #f0f7fb;
  border-bottom: 1px solid #d8e3ea;
  color: #25313a;
  font-size: 17px;
  font-weight: 600;
  margin: 0;
  padding: 13px 16px;
  white-space: pre-line;
}

.lesson-row {
  display: grid;
  gap: 14px;
  grid-template-columns: 118px minmax(0, 1fr);
  padding: 14px 16px;
}

.lesson-row + .lesson-row {
  border-top: 1px solid #edf1f4;
}

.time {
  align-self: start;
  background: #f7fafc;
  border: 1px solid #dce7ee;
  border-radius: 7px;
  color: #26323a;
  font-size: 13px;
  font-weight: 600;
  padding: 9px 8px;
  text-align: center;
}

.lesson-card {
  background: #fbfdff;
  border: 1px solid #dbe8f0;
  border-left: 4px solid var(--main-color);
  border-radius: 7px;
  display: grid;
  gap: 6px;
  padding: 11px 12px;
}

.lesson-top {
  align-items: flex-start;
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.week {
  border-radius: 999px;
  color: #ffffff;
  flex: 0 0 auto;
  font-size: 11px;
  font-weight: 600;
  line-height: 1;
  padding: 5px 8px;
}

.week.one {
  background: #1594d2;
}

.week.two {
  background: #64748b;
}

.group {
  color: var(--main-dark);
  font-size: 12px;
  font-weight: 600;
  line-height: 1.25;
  max-height: 3.8em;
  overflow-wrap: anywhere;
  overflow: hidden;
}

.subject {
  color: #222b33;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.3;
}

.detail {
  color: #59656f;
  font-size: 13px;
  line-height: 1.35;
  overflow-wrap: anywhere;
}

@media (max-width: 980px) {
  body {
    display: block;
  }

  .sidebar {
    min-height: auto;
    width: 100%;
  }

  .controls,
  .workspace {
    grid-template-columns: 1fr;
  }

  .lesson-row {
    grid-template-columns: 1fr;
  }

  .tabs,
  .week-tabs {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}