:root {
  --bg: #f7f7f5;
  --card: #ffffff;
  --fg: #16161a;
  --muted: #77777f;
  --line: #e4e4e0;
  --accent: #16161a;
  --danger: #b3261e;
  --warn: #9a6700;
  --ok: #1a7f37;
  --radius: 12px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101014;
    --card: #18181d;
    --fg: #ececf1;
    --muted: #9a9aa5;
    --line: #2a2a32;
    --accent: #ececf1;
    --danger: #f2555a;
    --warn: #e3b341;
    --ok: #3fb950;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

a { color: inherit; }
code { background: var(--bg); padding: 2px 6px; border-radius: 6px; font-size: 13px; }

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  max-width: 1000px;
  margin: 0 auto;
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
}

.brand { font-weight: 700; text-decoration: none; letter-spacing: -0.02em; }
header nav { display: flex; gap: 14px; font-size: 14px; }
header nav a { text-decoration: none; color: var(--muted); }
header nav a:hover { color: var(--fg); }

main { max-width: 1000px; margin: 0 auto; padding: 20px 16px 60px; }
footer { text-align: center; color: var(--muted); font-size: 12px; padding: 20px; }

h1 { font-size: 24px; margin: 0; letter-spacing: -0.02em; }
h2 { font-size: 16px; margin: 0 0 12px; }

.page-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}

.muted { color: var(--muted); font-size: 13px; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  margin-bottom: 16px;
}

.card.narrow { max-width: 360px; margin: 60px auto; }

.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px; }
.grid.days { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }

.group-card { display: flex; flex-direction: column; gap: 4px; text-decoration: none; }
.group-card:hover { border-color: var(--accent); }

.badge {
  display: inline-block;
  font-size: 12px;
  padding: 2px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
}

.day.today { border-color: var(--accent); }

.lesson { padding: 5px 0; border-bottom: 1px solid var(--line); font-size: 14px; }
.lesson:last-child { border-bottom: 0; }
.lesson.kind-replace { color: var(--warn); }
.lesson.kind-cancel { color: var(--danger); text-decoration: line-through; }
.lesson.kind-add { color: var(--ok); }

.kind { font-size: 12px; white-space: nowrap; }
.kind-replace { color: var(--warn); }
.kind-cancel { color: var(--danger); }
.kind-add { color: var(--ok); }

table { width: 100%; border-collapse: collapse; font-size: 14px; }
th { text-align: left; font-weight: 600; color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: 0.04em; }
th, td { padding: 7px 8px; border-bottom: 1px solid var(--line); vertical-align: middle; }
tr:last-child td { border-bottom: 0; }

input, select {
  background: var(--bg);
  color: var(--fg);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 7px 10px;
  font: inherit;
  font-size: 14px;
  width: 100%;
}

input:focus, select:focus { outline: 2px solid var(--accent); outline-offset: -1px; }

label { display: block; margin-bottom: 10px; font-size: 13px; color: var(--muted); }
label input, label select { margin-top: 4px; }
label.check { display: flex; align-items: center; gap: 8px; color: var(--fg); }
label.check input { width: auto; }

.btn {
  display: inline-block;
  background: var(--card);
  color: var(--fg);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 7px 14px;
  font: inherit;
  font-size: 14px;
  text-decoration: none;
  cursor: pointer;
  width: auto;
}
.btn:hover { border-color: var(--accent); }
.btn.primary { background: var(--accent); color: var(--bg); border-color: var(--accent); }
.btn.danger { color: var(--danger); }
.btn.small { padding: 4px 9px; font-size: 13px; }

.inline { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.actions { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }

.form-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(170px, 1fr)); gap: 10px 14px; align-items: end; }
.form-grid .wide { grid-column: span 2; }
.form-grid .check { margin-bottom: 4px; }
.form-grid button { justify-self: start; }

.lesson-rows { display: flex; flex-direction: column; gap: 8px; }
.lesson-row {
  display: grid;
  grid-template-columns: 56px 110px 100px minmax(140px, 2fr) minmax(120px, 1.4fr) 70px auto auto;
  gap: 6px;
  align-items: center;
}
.lesson-row.add { margin-top: 12px; padding-top: 12px; border-top: 1px dashed var(--line); }
.lesson-row input, .lesson-row select { padding: 5px 8px; font-size: 13px; }

.bell-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(360px, 1fr)); gap: 8px; }
.bell-row { display: grid; grid-template-columns: 56px auto auto auto; gap: 8px; align-items: center; }

.time-input { display: inline-flex; align-items: center; gap: 2px; }
.time-input select { width: auto; padding: 6px 6px; font-size: 13px; font-variant-numeric: tabular-nums; }
.time-input .time-colon { color: var(--muted); }
.change-field { display: inline-flex; align-items: center; gap: 6px; font-size: 12px; color: var(--muted); white-space: nowrap; }
input.time-change { width: 64px; padding: 6px 8px; }
.stand-change { color: #9a9aa5; }

.tabs { display: flex; gap: 6px; flex-wrap: wrap; }
.tab {
  padding: 6px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  text-decoration: none;
  font-size: 14px;
  color: var(--muted);
}
.tab:hover { border-color: var(--accent); color: var(--fg); }
.tab.active { background: var(--accent); color: var(--bg); border-color: var(--accent); }

.grid-edit {
  display: grid;
  grid-template-columns: 48px repeat(6, minmax(140px, 1fr));
  gap: 6px;
  overflow-x: auto;
}
.grid-edit-head {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  font-weight: 600;
  padding: 4px 2px;
}
.grid-pair { font-weight: 700; color: var(--muted); padding-top: 8px; }
.grid-cell {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 6px;
  border: 1px solid var(--line);
  border-radius: 8px;
  min-width: 0;
}
.grid-cell .cell-time { font-size: 11px; color: var(--muted); font-variant-numeric: tabular-nums; }
.grid-cell select, .grid-cell input { padding: 5px 7px; font-size: 13px; }

@media (max-width: 900px) {
  .grid-edit { grid-template-columns: 40px repeat(6, minmax(120px, 1fr)); }
}

.flash {
  background: var(--card);
  border: 1px solid var(--line);
  border-left: 3px solid var(--ok);
  border-radius: 8px;
  padding: 10px 14px;
  margin-bottom: 14px;
  font-size: 14px;
}
.flash.error { border-left-color: var(--danger); }

.subscribe ol { margin: 0 0 10px; padding-left: 20px; }
.subscribe li { margin-bottom: 6px; }

@media (max-width: 720px) {
  .lesson-row { grid-template-columns: 1fr 1fr; }
  .lesson-row input[name="subject"], .lesson-row input[name="teacher"] { grid-column: span 2; }
  .form-grid .wide { grid-column: span 1; }
}

.brandline { display: flex; align-items: baseline; gap: 10px; min-width: 0; }
.subtitle { color: var(--muted); font-size: 13px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.tiles { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 12px; margin-bottom: 16px; }
.tile { display: flex; flex-direction: column; gap: 4px; text-decoration: none; margin-bottom: 0; }
.tile:hover { border-color: var(--accent); }

.announcement { padding: 8px 0; border-bottom: 1px solid var(--line); }
.announcement:last-of-type { border-bottom: 0; }
.announcement p { margin: 4px 0 0; font-size: 14px; }
.linkish { text-decoration: underline; }

textarea {
  width: 100%;
  background: var(--bg);
  color: var(--fg);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 7px 10px;
  font: inherit;
  font-size: 13px;
  resize: vertical;
}
textarea:focus { outline: 2px solid var(--accent); outline-offset: -1px; }
.nowrap { white-space: nowrap; }
.menu-table td { vertical-align: top; }

.user-row {
  display: grid;
  grid-template-columns: 120px minmax(120px, 1fr) 190px 120px 140px auto auto;
  gap: 6px;
  align-items: center;
  padding: 7px 0;
  border-bottom: 1px solid var(--line);
}
.user-row:last-of-type { border-bottom: 0; }
.user-row input, .user-row select { padding: 5px 8px; font-size: 13px; }

.stand-body {
  background: #0b0b0f;
  color: #f2f2f5;
  min-height: 100vh;
}
.stand-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  padding: 18px 28px;
  border-bottom: 1px solid #23232b;
  max-width: none;
}
.stand-brand { font-size: 20px; font-weight: 700; letter-spacing: -0.02em; }
.stand-clock { font-size: 44px; font-weight: 700; font-variant-numeric: tabular-nums; }
.stand-date { text-align: right; color: #9a9aa5; font-size: 15px; line-height: 1.5; }
.stand-main {
  display: grid;
  grid-template-columns: 1.8fr 1fr;
  gap: 22px;
  max-width: 1600px;
  margin: 0 auto;
  padding: 22px 28px 110px;
}
.stand-h2 { font-size: 15px; text-transform: uppercase; letter-spacing: 0.06em; color: #9a9aa5; margin-bottom: 12px; }
.stand-lesson {
  display: grid;
  grid-template-columns: 58px 130px 1.2fr 1fr;
  gap: 12px;
  align-items: center;
  padding: 14px 18px;
  margin-bottom: 10px;
  background: #121218;
  border: 1px solid #23232b;
  border-radius: 14px;
  font-size: 20px;
  transition: border-color 0.3s, box-shadow 0.3s;
}
.stand-lesson.now { border-color: #3fb950; background: #0f1a12; box-shadow: 0 0 26px rgba(63, 185, 80, 0.18); }
.stand-lesson.cancel { opacity: 0.55; }
.stand-lesson.cancel .stand-subject { text-decoration: line-through; }
.stand-pair { font-weight: 700; color: #9a9aa5; white-space: nowrap; }
.stand-time { color: #9a9aa5; font-variant-numeric: tabular-nums; white-space: nowrap; }
.stand-who { color: #b9b9c3; font-size: 17px; }
.stand-who strong { color: #e3b341; }
.stand-empty { color: #9a9aa5; font-size: 20px; }
.stand-side { background: #121218; border: 1px solid #23232b; border-radius: 14px; padding: 16px 18px; margin-bottom: 16px; }
.stand-menu { margin: 0 0 8px; font-size: 17px; }
.stand-menu:last-child { margin-bottom: 0; }
.stand-announce { padding: 8px 0; border-bottom: 1px solid #23232b; font-size: 16px; }
.stand-announce:last-child { border-bottom: 0; }
.stand-announce p { margin: 4px 0 0; color: #b9b9c3; }
.stand-muted { color: #9a9aa5; font-size: 14px; display: block; }
.stand-foot {
  position: fixed;
  left: 0; right: 0; bottom: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 12px 28px;
  background: rgba(11, 11, 15, 0.92);
  border-top: 1px solid #23232b;
}
.stand-nav { display: flex; gap: 14px; flex-wrap: wrap; }
.stand-nav a { color: #9a9aa5; text-decoration: none; font-size: 15px; }
.stand-nav a.active { color: #f2f2f5; font-weight: 700; }
.stand-body .btn { background: #1b1b22; color: #f2f2f5; border-color: #2e2e38; }

@media (max-width: 900px) {
  .stand-main { grid-template-columns: 1fr; }
  .stand-clock { font-size: 30px; }
  .stand-head { flex-wrap: wrap; }
  .user-row { grid-template-columns: 1fr 1fr; }
}