:root {
  --bg: #f8fafc;
  --panel: rgba(255, 255, 255, 0.94);
  --panel-soft: #f1f5f9;
  --text: #0f172a;
  --muted: #64748b;
  --line: #e2e8f0;
  --brand: #0f766e;
  --brand-dark: #115e59;
  --dark: #0f172a;
  --shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
  --max: 1180px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.55;
}

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

.container {
  width: min(var(--max), calc(100% - 32px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  min-height: 74px;
}

.brand-title {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.brand-sub {
  color: var(--muted);
  font-size: 0.92rem;
  margin-top: 2px;
}

.nav {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  font-size: 0.95rem;
  color: var(--muted);
}

.nav a:hover {
  color: var(--text);
}

.teacher-page {
  padding: 28px 0 40px;
  background:
    linear-gradient(rgba(248, 250, 252, 0.78), rgba(248, 250, 252, 0.84)),
    url("classroom-bg.webp") center/cover no-repeat;
  border-top: 1px solid rgba(226, 232, 240, 0.7);
  border-bottom: 1px solid rgba(226, 232, 240, 0.7);
  min-height: calc(100vh - 75px);
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 28px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(5px);
}

.card {
  padding: 28px;
}

.page-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 20px;
}

.section-kicker {
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.78rem;
  font-weight: 800;
  color: var(--brand);
  margin-bottom: 8px;
}

h1 {
  font-size: clamp(2rem, 3.3vw, 3.6rem);
  line-height: 1.08;
  letter-spacing: -0.035em;
  margin: 0;
}

h2 {
  margin: 0 0 16px;
  font-size: 1.4rem;
  letter-spacing: -0.02em;
}

p {
  margin: 0 0 14px;
  color: var(--muted);
}

.button,
button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 18px;
  border-radius: 16px;
  font-weight: 700;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.15s ease;
  font-family: inherit;
  font-size: 0.95rem;
}

.button:hover,
button:hover {
  transform: translateY(-1px);
}

.button-primary,
button.primary {
  background: var(--dark);
  color: #fff;
}

.button-secondary,
button.secondary {
  background: #fff;
  border-color: var(--line);
  color: var(--text);
}

.button-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 18px;
}

.field {
  margin-bottom: 16px;
}

.field label {
  display: block;
  font-size: 0.92rem;
  font-weight: 700;
  margin: 0 0 8px 0;
  color: var(--text);
}

.field input,
.field select,
.field textarea {
  width: 100%;
  padding: 14px 16px;
  border-radius: 16px;
  border: 1px solid var(--line);
  font-size: 1rem;
  outline: none;
  background: #fff;
  font-family: Arial, Helvetica, sans-serif;
}

.field input:focus,
.field select:focus,
.field textarea:focus {
  border-color: #94a3b8;
}

.helper-text {
  color: var(--muted);
  font-size: 0.95rem;
  margin-bottom: 18px;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 20px;
  align-items: start;
}

.list-card,
.info-box {
  background: var(--panel-soft);
  border-radius: 20px;
  padding: 18px;
}

.class-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 14px;
}

.class-list li {
  background: var(--panel-soft);
  border-radius: 18px;
  padding: 18px;
}

.table-wrap {
  overflow-x: auto;
  margin-top: 16px;
}

table {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
  border-radius: 18px;
  overflow: hidden;
}

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

th {
  background: var(--panel-soft);
  font-size: 0.92rem;
}

.badge {
  background: #d1fae5;
  color: var(--brand-dark);
  padding: 8px 12px;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 700;
  white-space: nowrap;
}

.error-box {
  background: #fee2e2;
  color: #991b1b;
  border-radius: 16px;
  padding: 14px 16px;
  margin-bottom: 18px;
}

.success-box {
  background: #dcfce7;
  color: #166534;
  border-radius: 16px;
  padding: 14px 16px;
  margin-bottom: 18px;
}

.top-link {
  display: inline-block;
  margin-bottom: 16px;
  color: var(--brand-dark);
  font-weight: 700;
}

.table-wrap select,
.table-wrap input[type="text"] {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  font-family: inherit;
  font-size: 0.95rem;
  color: var(--text);
}

.table-wrap select:focus,
.table-wrap input[type="text"]:focus {
  outline: none;
  border-color: #94a3b8;
  box-shadow: 0 0 0 3px rgba(148, 163, 184, 0.15);
}

.table-wrap td {
  min-width: 120px;
}

.table-wrap td:last-child {
  min-width: 180px;
}

.table-wrap table {
  border-radius: 18px;
  overflow: hidden;
}

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


.table-wrap td form {
  margin: 0;
}

.table-wrap td .secondary {
  padding: 9px 12px;
  font-size: 0.88rem;
  border-radius: 12px;
}

.table-wrap td .button-row {
  margin-top: 0;
  gap: 8px;
}

.table-wrap td .button {
  padding: 9px 12px;
  font-size: 0.88rem;
  border-radius: 12px;
}

.report-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.summary-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.badge-good {
  background: #dcfce7;
}

.badge-warn {
  background: #fef3c7;
}

.badge-bad {
  background: #fee2e2;
}

.badge-neutral {
  background: var(--panel-soft);
}

.print-hide {
  display: block;
}

@media (max-width: 1024px) {
  .report-grid,
  .summary-strip {
    grid-template-columns: 1fr;
  }
}

@media print {
  body {
    background: #fff !important;
  }

  .print-hide {
    display: none !important;
  }

  .teacher-page {
    background: #fff !important;
    padding: 0 !important;
    border: none !important;
  }

  .panel {
    box-shadow: none !important;
    border: 1px solid #ddd !important;
    background: #fff !important;
  }

  .info-box {
    background: #fff !important;
    border: 1px solid #ddd;
  }

  .site-header,
  .nav,
  .button,
  button {
    display: none !important;
  }
}

.student-actions {
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: flex-start;
}

.student-actions .button {
  min-width: 86px;
  padding: 9px 12px;
  font-size: 0.88rem;
  border-radius: 12px;
}

.table-wrap td {
  vertical-align: top;
}

@media (max-width: 1024px) {
  .grid-2 {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .header-inner,
  .page-head {
    align-items: start;
    flex-direction: column;
  }

  .nav {
    gap: 12px;
  }
}