:root {
  --bg: #120f0d;
  --panel: rgba(255, 255, 255, 0.08);
  --panel-strong: rgba(255, 255, 255, 0.13);
  --line: rgba(255, 255, 255, 0.18);
  --text: #fff7ef;
  --muted: #cdbfb2;
  --orange: #ff7a1a;
  --orange-2: #ffb156;
  --green: #23d18b;
  --red: #ff4f5e;
  --gray: #737985;
  --shadow: 0 20px 70px rgba(0, 0, 0, 0.38);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(255, 122, 26, 0.24), transparent 32rem),
    linear-gradient(135deg, #120f0d 0%, #1b1715 45%, #201410 100%);
}

a {
  color: inherit;
  text-decoration: none;
}

.shell {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 24px 0 48px;
}

.glass {
  background: linear-gradient(145deg, var(--panel), rgba(255, 255, 255, 0.04));
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
  border-radius: 8px;
}

.topnav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 34px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
}

.brand {
  font-weight: 800;
  color: var(--orange-2);
}

.navlinks,
.actions,
.inline-form {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.page-stack {
  display: grid;
  gap: 22px;
}

.page-title h1,
.classroom-head h1,
.auth-hero h1 {
  margin: 6px 0 0;
  line-height: 1.05;
}

.eyebrow,
.pill {
  color: var(--orange-2);
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
}

.pill {
  display: inline-flex;
  padding: 5px 8px;
  border: 1px solid rgba(255, 122, 26, 0.36);
  border-radius: 999px;
  background: rgba(255, 122, 26, 0.12);
}

.button {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  justify-content: center;
  padding: 0 16px;
  border: 0;
  border-radius: 8px;
  color: #1a0f08;
  background: linear-gradient(135deg, var(--orange), var(--orange-2));
  font-weight: 800;
  cursor: pointer;
}

.button.ghost {
  color: var(--text);
  background: rgba(255, 255, 255, 0.09);
  border: 1px solid var(--line);
}

.button.danger {
  color: #fff;
  background: linear-gradient(135deg, #c72439, var(--red));
}

input,
select,
button {
  font: inherit;
}

input,
select {
  width: 100%;
  min-height: 42px;
  padding: 9px 11px;
  color: var(--text);
  background: rgba(0, 0, 0, 0.22);
  border: 1px solid var(--line);
  border-radius: 8px;
}

select[multiple] {
  min-height: 130px;
}

label {
  display: grid;
  gap: 7px;
  color: var(--muted);
  font-size: 0.92rem;
}

.form,
.admin-form {
  display: grid;
  gap: 14px;
}

.admin-form {
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  align-items: end;
}

.check {
  display: flex;
  align-items: center;
  gap: 9px;
}

.check input {
  width: auto;
  min-height: auto;
}

.auth-layout {
  min-height: calc(100vh - 72px);
  display: grid;
  grid-template-columns: 1fr 380px;
  align-items: center;
  gap: 42px;
}

.auth-hero p {
  max-width: 620px;
  color: var(--muted);
  font-size: 1.05rem;
}

.login-card,
.panel {
  padding: 22px;
}

.alert,
.notice {
  padding: 12px;
  border-radius: 8px;
  color: #ffe2d0;
  background: rgba(255, 79, 94, 0.16);
  border: 1px solid rgba(255, 79, 94, 0.32);
}

.class-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
}

.class-card {
  display: grid;
  gap: 16px;
  padding: 18px;
}

.class-card h2 {
  margin: 8px 0 0;
}

.admin-strip {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  padding: 10px;
}

.admin-strip a {
  padding: 9px 12px;
  border-radius: 8px;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.06);
}

.classroom-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.stats-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.stat {
  padding: 16px;
}

.stat span {
  color: var(--muted);
}

.stat strong {
  display: block;
  margin-top: 4px;
  font-size: 2rem;
}

.classroom-board {
  padding: 16px;
}

.classroom-map {
  position: relative;
  width: 100%;
  min-height: 620px;
  border-radius: 8px;
  overflow: hidden;
  background:
    linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    rgba(0, 0, 0, 0.18);
  background-size: 20px 20px;
}

.seat {
  position: absolute;
  width: 15%;
  min-width: 118px;
  min-height: 82px;
  display: grid;
  align-content: center;
  gap: 4px;
  padding: 10px;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.28);
}

.seat-ok {
  background: rgba(35, 209, 139, 0.22);
  border-color: rgba(35, 209, 139, 0.58);
}

.seat-violation {
  background: rgba(255, 79, 94, 0.28);
  border-color: rgba(255, 79, 94, 0.72);
}

.seat-offline {
  background: rgba(115, 121, 133, 0.24);
  border-color: rgba(180, 185, 195, 0.34);
}

.seat-label,
.seat small {
  color: var(--muted);
  overflow-wrap: anywhere;
}

.seat strong {
  overflow-wrap: anywhere;
}

.table-wrap {
  overflow-x: auto;
}

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

th,
td {
  padding: 12px 10px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  color: var(--orange-2);
}

td form {
  display: inline-flex;
}

.setup-page {
  min-height: 100vh;
  display: grid;
  place-items: center;
}

.setup-list {
  color: var(--muted);
}

.empty-state {
  padding: 24px;
  color: var(--muted);
}

@media (max-width: 760px) {
  .auth-layout,
  .stats-row {
    grid-template-columns: 1fr;
  }

  .classroom-head,
  .topnav {
    align-items: flex-start;
    flex-direction: column;
  }

  .classroom-board {
    overflow-x: auto;
  }

  .classroom-map {
    min-width: 720px;
    min-height: 900px;
  }
}