:root {
  --bg: #f5f6fa;
  --card-bg: #ffffff;
  --sidebar-bg: #ffffff;
  --text: #1f2430;
  --muted: #6b7280;
  --border: #e2e4ea;
  --border-soft: #eef0f4;
  --accent: #2e448f;
  --accent-soft: #e1e6f5;
  --topbar-bg: #2e448f;
  --topbar-text: #ffffff;
  --head-bg: #e1e6f5;
  --head-text: #2e448f;
  --input-bg: #ffffff;
  --tag-n-bg: #e1e6f5;
  --tag-n-text: #2e448f;
  --tag-s-bg: #eaf6ec;
  --tag-s-text: #2f7a3c;
  --tag-k-bg: #fdf1e3;
  --tag-k-text: #a3620b;
  --tag-border: transparent;
  --table-border-width: 1px;
}

html[data-theme="dark"] {
  --bg: #12141c;
  --card-bg: #1b1e29;
  --sidebar-bg: #171a23;
  --text: #e6e8ef;
  --muted: #9096a6;
  --border: #2a2e3b;
  --border-soft: #242732;
  --accent: #8fa4e8;
  --accent-soft: #26314f;
  --topbar-bg: #1b1e29;
  --topbar-text: #e6e8ef;
  --head-bg: #222739;
  --head-text: #aebbee;
  --input-bg: #20232e;
  --tag-n-bg: #26314f;
  --tag-n-text: #aebbee;
  --tag-s-bg: #1d3324;
  --tag-s-text: #7fd39a;
  --tag-k-bg: #3a2a12;
  --tag-k-text: #e3a95c;
}

html[data-contrast="high"] {
  --bg: #ffffff;
  --card-bg: #ffffff;
  --sidebar-bg: #ffffff;
  --text: #000000;
  --muted: #000000;
  --border: #000000;
  --border-soft: #000000;
  --accent: #0000cc;
  --accent-soft: #ffff00;
  --topbar-bg: #000000;
  --topbar-text: #ffffff;
  --head-bg: #000000;
  --head-text: #ffffff;
  --input-bg: #ffffff;
  --tag-n-bg: #ffffff;
  --tag-n-text: #000000;
  --tag-s-bg: #ffffff;
  --tag-s-text: #000000;
  --tag-k-bg: #ffffff;
  --tag-k-text: #000000;
  --tag-border: #000000;
  --table-border-width: 2px;
}

html[data-contrast="high"] a {
  text-decoration: underline;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  line-height: 1.5;
}

a { color: inherit; }

.icon {
  width: 1.05rem;
  height: 1.05rem;
  flex-shrink: 0;
}

.topbar {
  display: flex;
  align-items: center;
  gap: .75rem;
  padding: .6rem 1rem;
  background: var(--topbar-bg);
  color: var(--topbar-text);
  position: sticky;
  top: 0;
  z-index: 20;
}

.topbar h1 {
  font-size: 1.05rem;
  margin: 0;
  font-weight: 600;
}

.topbar .logo {
  height: 2.25rem;
  width: auto;
  border-radius: .3rem;
  background: #fff;
  padding: .1rem;
}

.nav-toggle {
  display: none;
  background: transparent;
  border: none;
  color: inherit;
  font-size: 1.3rem;
  cursor: pointer;
  padding: .1rem .4rem;
}

.topbar-actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: .35rem;
  flex-wrap: wrap;
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .3rem;
  height: 2.2rem;
  background: rgba(255, 255, 255, .12);
  border: 1px solid rgba(255, 255, 255, .3);
  color: inherit;
  padding: 0 .6rem;
  border-radius: .45rem;
  cursor: pointer;
  font: inherit;
  font-size: .8rem;
  line-height: 1;
  box-sizing: border-box;
}

.icon-btn:hover {
  background: rgba(255, 255, 255, .22);
}

.icon-btn.is-active {
  background: rgba(255, 255, 255, .35);
}

html[data-contrast="high"] .icon-btn {
  border-color: #ffffff;
}

.font-group {
  display: inline-flex;
}

.font-group .icon-btn {
  border-radius: 0;
  width: 2.4rem;
  padding: 0;
}

.font-group .icon-btn:first-child {
  border-top-left-radius: .45rem;
  border-bottom-left-radius: .45rem;
}

.font-group .icon-btn:last-child {
  border-top-right-radius: .45rem;
  border-bottom-right-radius: .45rem;
}

.font-group .icon-btn + .icon-btn {
  margin-left: -1px;
}

.theme-icon-dark { display: none; }
html[data-theme="dark"] .theme-icon-light { display: none; }
html[data-theme="dark"] .theme-icon-dark { display: inline-flex; }

.layout {
  display: flex;
  align-items: flex-start;
  min-height: calc(100vh - 3.4rem);
}

.sidebar {
  width: 19.5rem;
  flex-shrink: 0;
  background: var(--sidebar-bg);
  border-right: 1px solid var(--border);
  padding: .85rem;
  position: sticky;
  top: 3.4rem;
  height: calc(100vh - 3.4rem);
  overflow-y: auto;
}

#nav-filter {
  width: 100%;
  padding: .5rem .65rem;
  border: 1px solid var(--border);
  border-radius: .5rem;
  font: inherit;
  font-size: .85rem;
  background: var(--input-bg);
  color: var(--text);
}

.nav-group {
  margin-top: .9rem;
  padding-top: .9rem;
  border-top: 1px solid var(--border);
}

.nav-group:first-of-type {
  margin-top: .85rem;
  padding-top: .85rem;
}

.nav-group h3 {
  display: flex;
  align-items: center;
  gap: .4rem;
  font-size: .74rem;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--accent);
  font-weight: 700;
  margin: 0 0 .45rem;
  padding-left: .55rem;
  border-left: .2rem solid var(--accent);
}

.nav-group ul {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--border-soft);
}

.nav-group li {
  border-bottom: 1px solid var(--border-soft);
}

.nav-group li a {
  display: block;
  padding: .5rem .55rem;
  border-radius: 0;
  text-decoration: none;
  color: var(--text);
  font-size: .9rem;
}

.nav-group li a:hover {
  background: var(--accent-soft);
}

.nav-group li a.active {
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 600;
}

.content {
  flex: 1;
  padding: 1rem 1.25rem 2rem;
  min-width: 0;
}

.plan-header {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: .5rem 1rem;
  margin-bottom: 1rem;
}

.plan-header h2 {
  margin: 0;
  font-size: 1.35rem;
}

.plan-meta {
  color: var(--muted);
  margin: 0;
  font-size: .85rem;
}

.print-btn {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  border: 1px solid var(--border);
  background: var(--card-bg);
  color: var(--text);
  padding: .45rem 1rem;
  border-radius: .5rem;
  cursor: pointer;
  font: inherit;
}

.print-btn:hover {
  background: var(--accent-soft);
}

.plan-table-wrap {
  border: 1px solid var(--border);
  border-radius: .75rem;
  overflow: auto;
  background: var(--card-bg);
}

table.plan-table {
  width: 100%;
  border-collapse: collapse;
}

table.plan-table th {
  background: var(--head-bg);
  color: var(--head-text);
  font-weight: 600;
  text-align: left;
  padding: .7rem .85rem;
  font-size: .8rem;
  white-space: nowrap;
  border: var(--table-border-width) solid var(--border);
}

table.plan-table td {
  padding: .7rem .85rem;
  border: var(--table-border-width) solid var(--border);
  vertical-align: top;
  font-size: .85rem;
  line-height: 1.35;
}

table.plan-table .col-nr,
table.plan-table .col-godz {
  text-align: center;
  vertical-align: middle;
  white-space: nowrap;
  color: var(--muted);
  font-weight: 600;
  width: 1%;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}

.lesson + .lesson {
  margin-top: .3rem;
  padding-top: .3rem;
  border-top: 1px dashed var(--border-soft);
}

.lesson-subject {
  font-weight: 600;
}

.lesson-tags {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .3rem;
  margin-top: .25rem;
}

.tag {
  font-size: .72rem;
  padding: .12rem .55rem;
  border-radius: 999px;
  text-decoration: none;
  border: 1px solid var(--tag-border);
}

.tag-n { background: var(--tag-n-bg); color: var(--tag-n-text); }
.tag-s { background: var(--tag-s-bg); color: var(--tag-s-text); }
.tag-k { background: var(--tag-k-bg); color: var(--tag-k-text); }

.lesson-note {
  font-size: .72rem;
  color: var(--muted);
  font-style: italic;
  align-self: center;
}

.lesson-empty {
  color: var(--muted);
}

.plan-footnote {
  margin-top: 1rem;
  font-size: .72rem;
  color: var(--muted);
}

@media (max-width: 47.99em) {
  .nav-toggle {
    display: inline-flex;
    font-size: 1.9rem;
    padding: .1rem .5rem;
  }

  .sidebar {
    position: fixed;
    inset: 3.4rem 0 0 0;
    height: auto;
    transform: translateX(-100%);
    transition: transform .2s ease;
    z-index: 15;
    width: 100%;
    max-width: 21rem;
  }

  .sidebar.open {
    transform: translateX(0);
    box-shadow: .5rem 0 1.5rem rgba(0, 0, 0, .25);
  }

  .topbar-actions {
    position: fixed;
    left: 0;
    bottom: 0;
    margin-left: 0;
    z-index: 25;
    background: var(--topbar-bg);
    color: var(--topbar-text);
    padding: .5rem;
    border-top-right-radius: .6rem;
    box-shadow: 0 -.15rem .6rem rgba(0, 0, 0, .2);
  }

  .content {
    padding-bottom: 4.5rem;
  }
}

@media (max-width: 39.99em) {
  table.plan-table thead {
    display: none;
  }

  table.plan-table, table.plan-table tbody, table.plan-table tr, table.plan-table td {
    display: block;
    width: 100%;
  }

  table.plan-table tr {
    margin-bottom: .75rem;
    border-bottom: 1px solid var(--border);
  }

  table.plan-table tr:last-child {
    margin-bottom: 0;
  }

  table.plan-table td {
    border: none;
    border-bottom: 1px solid var(--border-soft);
    padding: .45rem .75rem;
  }

  table.plan-table td:last-child {
    border-bottom: none;
  }

  table.plan-table td[data-label]::before {
    content: attr(data-label) ": ";
    font-weight: 600;
    color: var(--muted);
  }

  table.plan-table .col-nr,
  table.plan-table .col-godz {
    display: inline-block;
    width: auto;
    text-align: left;
  }
}

@media print {
  .topbar, .sidebar, .nav-toggle, .print-btn {
    display: none !important;
  }

  .layout, .content {
    display: block;
    padding: 0;
  }
}