:root {
  --bg: #eef1f6;
  --bg-soft: #f7f9fc;
  --card: #ffffff;
  --border: #dfe4ec;
  --border-strong: #c9d1de;
  --text: #1a2230;
  --muted: #64748b;
  --accent: #2563eb;
  --accent-soft: #dbe7ff;
  --accent-text: #1d4ed8;
  --shadow: 0 1px 2px rgba(15, 23, 42, .06), 0 8px 24px rgba(15, 23, 42, .07);
  --radius: 14px;
  --radius-sm: 9px;
  --day-w: 96px;
  --pair-w: 86px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e131c;
    --bg-soft: #151b26;
    --card: #1a2130;
    --border: #2a3444;
    --border-strong: #3a465a;
    --text: #e7ecf3;
    --muted: #94a3b8;
    --accent: #4f8cff;
    --accent-soft: #22304a;
    --accent-text: #a9c6ff;
    --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 10px 30px rgba(0, 0, 0, .35);
  }
}

* { box-sizing: border-box; }
html, body { height: 100%; }

body {
  margin: 0;
  font-family: "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
  line-height: 1.45;
  -webkit-font-smoothing: antialiased;
}

/* ---------- Шапка ---------- */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding: 18px clamp(12px, 3vw, 32px);
  background: var(--card);
  border-bottom: 1px solid var(--border);
}
.brand { display: flex; align-items: center; gap: 14px; }
.logo { font-size: 30px; line-height: 1; filter: drop-shadow(0 2px 4px rgba(37, 99, 235, .25)); }
.topbar h1 { margin: 0; font-size: clamp(1.05rem, 2.4vw, 1.4rem); font-weight: 700; letter-spacing: -.01em; }
.sub { margin: 2px 0 0; color: var(--muted); font-size: .86rem; }

/* ---------- Кнопки ---------- */
.btn {
  font: inherit; cursor: pointer; border-radius: 10px; padding: 9px 14px;
  border: 1px solid var(--border-strong); background: var(--card); color: var(--text);
  transition: background .15s, border-color .15s, transform .05s; white-space: nowrap;
}
.btn:hover { border-color: var(--accent); color: var(--accent-text); }
.btn:active { transform: translateY(1px); }
.btn-ghost { background: transparent; }

.topbar-actions { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.status {
  font-size: .76rem;
  font-weight: 600;
  padding: 5px 10px;
  border-radius: 999px;
  white-space: nowrap;
  background: color-mix(in srgb, #f59e0b 18%, transparent);
  color: #b45309;
  border: 1px solid color-mix(in srgb, #f59e0b 35%, transparent);
}
@media (prefers-color-scheme: dark) {
  .status { background: color-mix(in srgb, #f59e0b 22%, transparent); color: #fbbf24; }
}

/* ---------- Фильтры ---------- */
.filters {
  position: sticky; top: 0; z-index: 30;
  display: flex; align-items: flex-end; gap: 14px; flex-wrap: wrap;
  padding: 14px clamp(12px, 3vw, 32px);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.field { display: flex; flex-direction: column; gap: 5px; }
.field-label { font-size: .72rem; font-weight: 600; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); }
select {
  font: inherit; min-width: 190px; padding: 9px 34px 9px 12px; border-radius: 10px;
  border: 1px solid var(--border-strong); background-color: var(--card); color: var(--text);
  cursor: pointer; appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M2 4l4 4 4-4' fill='none' stroke='%2364748b' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 12px center;
  transition: border-color .15s, box-shadow .15s;
}
select:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }

/* ---------- Комбобокс (преподаватель) ---------- */
.combo { position: relative; }
.combo input {
  font: inherit;
  width: 240px;
  max-width: 100%;
  padding: 9px 30px 9px 12px;
  border-radius: 10px;
  border: 1px solid var(--border-strong);
  background: var(--card);
  color: var(--text);
  transition: border-color .15s, box-shadow .15s;
}
.combo input::placeholder { color: var(--muted); }
.combo input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.combo.open input { border-color: var(--accent); }

.combo-clear {
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  width: 20px; height: 20px;
  display: flex; align-items: center; justify-content: center;
  border: 0; border-radius: 50%; cursor: pointer;
  background: color-mix(in srgb, var(--muted) 18%, transparent);
  color: var(--muted);
  font-size: 15px; line-height: 1;
  padding: 0;
}
.combo-clear:hover { background: var(--border-strong); color: var(--text); }

.combo-list {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  min-width: 100%;
  max-width: 340px;
  max-height: 320px;
  overflow: auto;
  margin: 0;
  padding: 4px;
  list-style: none;
  background: var(--card);
  border: 1px solid var(--border-strong);
  border-radius: 10px;
  box-shadow: var(--shadow);
  z-index: 50;
}
.combo-list li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 7px 10px;
  border-radius: 7px;
  cursor: pointer;
  font-size: .88rem;
  white-space: nowrap;
}
.combo-list li:hover,
.combo-list li.active { background: var(--accent-soft); color: var(--accent-text); }
.combo-list li .cnt { color: var(--muted); font-size: .74rem; flex: none; }
.combo-list li.active .cnt { color: var(--accent-text); }
.combo-list li.combo-empty { cursor: default; color: var(--muted); justify-content: flex-start; }
.combo-list li.combo-empty:hover { background: transparent; color: var(--muted); }
.result { margin-left: auto; color: var(--muted); font-size: .86rem; padding-bottom: 9px; }
.result b { color: var(--text); }

/* ---------- Контент ---------- */
main { padding: clamp(12px, 3vw, 28px); }

.state {
  max-width: 520px; margin: 48px auto; text-align: center; color: var(--muted);
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 26px 22px; box-shadow: var(--shadow);
}
.state.error { color: #dc2626; border-color: #fecaca; }
.state h2 { margin: 0 0 6px; font-size: 1.05rem; color: inherit; }
.state p { margin: 0; font-size: .88rem; }

/* ---------- Таблица ---------- */
.table-wrap {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: auto;
  max-height: calc(100vh - 230px);
}

table.tt {
  border-collapse: separate;
  border-spacing: 0;
  table-layout: fixed;
  width: max-content;
  min-width: 100%;
}

table.tt th,
table.tt td {
  border-bottom: 1px solid var(--border);
  border-right: 1px solid var(--border);
  vertical-align: top;
  text-align: left;
}
table.tt tr > *:last-child { border-right: 0; }
table.tt tbody tr:last-child > * { border-bottom: 0; }

/* верхний ряд — заголовки групп */
table.tt thead th {
  position: sticky;
  top: 0;
  z-index: 4;
  background: var(--bg-soft);
  font-size: .84rem;
}

.grp-col {
  padding: 8px 10px;
  width: 200px;
  min-width: 200px;
  max-width: 200px;
  border-bottom: 3px solid var(--c, var(--border)) !important;
}
.grp-btn {
  font: inherit; cursor: pointer; background: none; border: 0; padding: 0;
  display: flex; flex-direction: column; align-items: flex-start; gap: 1px;
  color: inherit; text-align: left; width: 100%;
}
.grp-btn:hover .grp-code { text-decoration: underline; }
.grp-year { font-size: .72rem; font-weight: 600; color: var(--c, var(--muted)); letter-spacing: .04em; }
.grp-code { font-size: .98rem; font-weight: 700; color: var(--text); }

/* липкие левые колонки */
.day-col, .pair-col {
  position: sticky;
  background: var(--bg-soft);
  z-index: 2;
}
.day-col { left: 0; width: var(--day-w); min-width: var(--day-w); max-width: var(--day-w); }
.pair-col { left: var(--day-w); width: var(--pair-w); min-width: var(--pair-w); max-width: var(--pair-w); }

thead .day-col, thead .pair-col { z-index: 6; }

thead th.day-col, thead th.pair-col { padding: 10px 12px; }
thead .lbl { font-size: .78rem; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); }

/* ячейка дня (rowspan) */
tbody th.day-col {
  padding: 12px 10px;
  vertical-align: top;
  border-right: 2px solid var(--border-strong);
}
tbody th.day-col .dow { display: block; font-size: 1.15rem; font-weight: 700; color: var(--text); line-height: 1.1; }
tbody th.day-col .dname { display: block; font-size: .74rem; color: var(--muted); margin-top: 2px; }
tbody th.day-col .dnum { display: block; font-size: .8rem; font-weight: 600; margin-top: 6px; color: var(--muted); }
tbody th.day-col.today { background: var(--accent-soft); }
tbody th.day-col.today .dow, tbody th.day-col.today .dnum { color: var(--accent-text); }

/* ячейка пары */
tbody th.pair-col {
  padding: 10px 12px;
  border-right: 2px solid var(--border-strong);
}
tbody th.pair-col .num { display: block; font-size: 1.05rem; font-weight: 700; }
tbody th.pair-col .time { display: block; font-size: .72rem; color: var(--muted); white-space: nowrap; }

table.tt td {
  padding: 6px;
  background: var(--card);
  width: 200px;
  min-width: 200px;
  max-width: 200px;
}
table.tt td.empty {
  background: repeating-linear-gradient(45deg, transparent, transparent 7px,
    color-mix(in srgb, var(--border) 30%, transparent) 7px, color-mix(in srgb, var(--border) 30%, transparent) 8px);
}

/* ---------- Карточка занятия ---------- */
.cell { display: flex; flex-direction: column; gap: 5px; }

.lesson {
  --c: var(--accent);
  border: 1px solid var(--border);
  border-left: 4px solid var(--c);
  border-radius: var(--radius-sm);
  background: var(--bg-soft);
  padding: 6px 8px;
  transition: box-shadow .15s;
}
.lesson:hover { box-shadow: 0 3px 10px rgba(15, 23, 42, .12); }
.lesson .subject { font-size: .82rem; font-weight: 600; line-height: 1.25; overflow-wrap: break-word; }
.lesson .meta { margin-top: 3px; font-size: .74rem; color: var(--muted); }
.lesson .tag {
  margin-top: 4px;
  display: inline-block;
  font-size: .68rem; font-weight: 600;
  padding: 1px 7px; border-radius: 999px;
  background: color-mix(in srgb, var(--c) 15%, transparent);
  color: var(--c);
}

.foot { padding: 14px clamp(12px, 3vw, 32px) 28px; color: var(--muted); font-size: .76rem; }

@media (max-width: 640px) {
  :root { --day-w: 74px; --pair-w: 74px; }
  .result { margin-left: 0; width: 100%; padding-bottom: 0; }
  select { min-width: 150px; flex: 1; }
  .table-wrap { max-height: none; }
  .grp-col, table.tt td { min-width: 128px; }
}

@media print {
  .filters, .topbar .btn { display: none; }
  body { background: #fff; }
  .table-wrap { box-shadow: none; max-height: none; overflow: visible; border: 0; }
  table.tt { width: 100%; }
  table.tt thead th, .day-col, .pair-col { background: #f2f2f2 !important; position: static; }
  .grp-col { max-width: none; }
}