:root {
  --dn-cyan: #00bae5;
  --dn-cyan-deep: #2291be;
  --dn-green: #19b47b;
  --dn-lime: #bbd036;
  --dn-yellow: #fed939;
  --dn-orange: #f4931c;
  --dn-violet: #b976af;
  --dn-ink: #1e1e1f;
  --dn-muted: #808285;
  --dn-line: #d1d3d4;
  --dn-bg: #f6fafc;
  --dn-surface: #ffffff;
  --dn-footer: #231f20;
  --dn-danger: #fc563a;
  --dn-warning: #f6921e;
  --font: "Open Sans", Helvetica, Arial, sans-serif;
  --radius: 4px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.12);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: var(--font);
  font-size: 14px;
  color: var(--dn-ink);
  background: var(--dn-bg);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
a { color: var(--dn-cyan-deep); text-decoration: none; }
a:hover { color: var(--dn-cyan); text-decoration: underline; }
.container { width: min(1100px, calc(100% - 2rem)); margin: 0 auto; }
.main { flex: 1; padding: 1.5rem 0 3rem; }

.colored-line {
  display: flex;
  height: 4px;
  width: 100%;
}
.colored-line__item { flex: 1; }
.colored-line__item_blue { background: #4cc0e2; }
.colored-line__item_green { background: #bbd036; }
.colored-line__item_yellow { background: #fed939; }
.colored-line__item_orange { background: #f4931c; }
.colored-line__item_violet { background: #b976af; }

.site-header {
  background: var(--dn-surface);
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 30;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 72px;
  flex-wrap: wrap;
  padding: 0.5rem 0;
}
.logo {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--dn-ink);
  text-decoration: none;
  font-weight: 700;
}
.logo:hover { text-decoration: none; color: var(--dn-ink); }
.logo-mark {
  width: 40px;
  height: 40px;
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--dn-cyan), var(--dn-cyan-deep));
  color: #fff;
  display: grid;
  place-items: center;
  font-size: 15px;
}
.logo-text { font-size: 16px; }
.nav {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  flex-wrap: wrap;
}
.nav a { color: var(--dn-ink); font-weight: 600; }
.nav-user { color: var(--dn-muted); font-size: 13px; }
.inline { display: inline; margin: 0; }

.btn {
  display: inline-block;
  border: 1px solid transparent;
  border-radius: var(--radius);
  padding: 0.45rem 1rem;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none !important;
  background: var(--dn-cyan);
  color: #fff !important;
}
.btn:hover { filter: brightness(0.95); }
.btn-green {
  background: var(--dn-green);
  border-color: var(--dn-green);
}
.btn-outline {
  background: transparent;
  border-color: var(--dn-green);
  color: var(--dn-green) !important;
}
.btn-outline:hover { background: rgba(25, 180, 123, 0.08); }
.btn-sm { padding: 0.3rem 0.7rem; font-size: 13px; }

.messages { margin-top: 1rem; }
.flash {
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  margin-bottom: 0.5rem;
  border: 1px solid var(--dn-line);
  background: #fff;
}
.flash-success { border-left: 4px solid var(--dn-green); }
.flash-error, .flash-warning { border-left: 4px solid var(--dn-warning); }
.flash-error { border-left-color: var(--dn-danger); }

.hero {
  background: var(--dn-surface);
  border: 1px solid var(--dn-line);
  border-radius: var(--radius);
  padding: 2rem 1.5rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow);
}
.hero h1 {
  margin: 0 0 0.5rem;
  font-size: 28px;
  font-weight: 700;
}
.hero p { margin: 0; color: var(--dn-muted); max-width: 40rem; }

.role-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin: 1.5rem 0;
}
@media (max-width: 800px) {
  .role-grid { grid-template-columns: 1fr; }
}
.role-card {
  background: var(--dn-surface);
  border: 1px solid var(--dn-line);
  border-radius: var(--radius);
  padding: 1.25rem;
  box-shadow: var(--shadow);
  transition: border-color 0.15s, transform 0.15s;
}
.role-card:hover {
  border-color: var(--dn-cyan);
  transform: translateY(-2px);
}
.role-card h2 {
  margin: 0 0 0.4rem;
  font-size: 18px;
  color: var(--dn-cyan-deep);
}
.role-card p { margin: 0 0 1rem; color: var(--dn-muted); font-size: 13px; }
.role-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius);
  display: grid;
  place-items: center;
  font-weight: 700;
  color: #fff;
  margin-bottom: 0.75rem;
  font-size: 18px;
}
.role-icon.admin { background: var(--dn-violet); }
.role-icon.teacher { background: var(--dn-cyan); }
.role-icon.parent { background: var(--dn-green); }

.panel {
  background: var(--dn-surface);
  border: 1px solid var(--dn-line);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin-bottom: 1rem;
  box-shadow: var(--shadow);
}
.panel h2, .panel h3 { margin-top: 0; }
.muted { color: var(--dn-muted); }
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
@media (max-width: 800px) {
  .grid-2 { grid-template-columns: 1fr; }
}

table.data {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}
table.data th, table.data td {
  border-bottom: 1px solid var(--dn-line);
  padding: 0.55rem 0.4rem;
  text-align: left;
  vertical-align: top;
}
table.data th {
  color: var(--dn-muted);
  font-weight: 600;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.02em;
}
table.data tr:hover td { background: #f0f9fc; }

.badge {
  display: inline-block;
  padding: 0.15rem 0.45rem;
  border-radius: 3px;
  font-size: 12px;
  font-weight: 600;
}
.badge-ok { background: #e6f7ef; color: var(--dn-green); }
.badge-warn { background: #fff4e5; color: var(--dn-warning); }
.badge-bad { background: #ffe8e4; color: var(--dn-danger); }

.input, select.input, textarea.input {
  width: 100%;
  border: 1px solid var(--dn-line);
  border-radius: var(--radius);
  padding: 0.5rem 0.65rem;
  font: inherit;
  background: #fff;
}
.input:focus {
  outline: 2px solid rgba(0, 186, 229, 0.35);
  border-color: var(--dn-cyan);
}
.form-row { margin-bottom: 0.85rem; }
.form-row label {
  display: block;
  margin-bottom: 0.3rem;
  font-weight: 600;
  font-size: 13px;
}
.help { color: var(--dn-muted); font-size: 12px; margin-top: 0.25rem; }
.errorlist { color: var(--dn-danger); margin: 0.25rem 0 0; padding-left: 1rem; }

.grade {
  display: inline-flex;
  width: 28px;
  height: 28px;
  align-items: center;
  justify-content: center;
  border-radius: 3px;
  background: #e8f8fc;
  color: var(--dn-cyan-deep);
  font-weight: 700;
  margin-right: 0.25rem;
}

.week-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 0.5rem;
  overflow-x: auto;
}
.day-col {
  background: #fff;
  border: 1px solid var(--dn-line);
  border-radius: var(--radius);
  min-width: 140px;
  padding: 0.5rem;
}
.day-today { border-color: var(--dn-cyan); box-shadow: 0 0 0 1px var(--dn-cyan); }
.day-col h4 {
  margin: 0 0 0.5rem;
  font-size: 13px;
  color: var(--dn-cyan-deep);
}
.slot {
  border-left: 3px solid var(--dn-cyan);
  padding: 0.35rem 0.4rem;
  margin-bottom: 0.4rem;
  background: var(--dn-bg);
  font-size: 12px;
}
.slot time { color: var(--dn-muted); display: block; }

.stats {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}
.stat {
  flex: 1;
  min-width: 120px;
  background: var(--dn-bg);
  border-radius: var(--radius);
  padding: 0.85rem 1rem;
  border: 1px solid var(--dn-line);
}
.stat strong { display: block; font-size: 24px; color: var(--dn-cyan-deep); }

.site-footer {
  background: var(--dn-footer);
  color: #c8c8c8;
  padding: 2rem 0;
  margin-top: auto;
}
.site-footer a { color: #eee; }
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 1.5rem;
}
@media (max-width: 700px) {
  .footer-grid { grid-template-columns: 1fr; }
  .week-grid { grid-template-columns: repeat(2, 1fr); }
}

.auth-box {
  max-width: 420px;
  margin: 1rem auto;
}
.deadline-bar {
  background: #fff8e8;
  border: 1px solid #f5d9a0;
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
  margin-bottom: 1rem;
}
.deadline-bar.late {
  background: #ffe8e4;
  border-color: #f5b5a8;
}