:root {
  --bg: #eef3f8;
  --surface: #ffffff;
  --surface-soft: #f7fafc;
  --ink: #142033;
  --muted: #66758a;
  --line: #dfe7ef;
  --primary: #0d7c66;
  --primary-dark: #075d4d;
  --primary-soft: #dff7f0;
  --accent: #d99b22;
  --danger: #c24141;
  --success: #0d7c66;
  --shadow: 0 22px 60px rgba(20, 32, 51, 0.12);
  --radius: 8px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(13, 124, 102, 0.14), transparent 34rem),
    linear-gradient(135deg, #f8fbfd 0%, var(--bg) 100%);
  font-family: Inter, "Segoe UI", Arial, sans-serif;
}

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

button,
input,
select {
  font: inherit;
}

.login-page,
.install-page {
  display: grid;
  place-items: center;
  padding: 24px;
}

.auth-shell {
  width: min(100%, 460px);
}

.auth-card {
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid rgba(255, 255, 255, 0.75);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 34px;
  backdrop-filter: blur(18px);
}

.auth-card h1,
.hero-panel h1,
.module-head h1 {
  margin: 8px 0 10px;
  font-size: clamp(28px, 4vw, 42px);
  letter-spacing: 0;
}

.auth-card p,
.hero-panel p,
.module-head p,
.panel-head p {
  color: var(--muted);
  margin: 0;
  line-height: 1.55;
}

.brand,
.topbar,
.user-pill,
.panel-head,
.table-toolbar,
.hero-panel,
.module-head {
  display: flex;
  align-items: center;
}

.brand {
  gap: 12px;
  padding: 18px;
}

.brand span:last-child {
  display: grid;
  gap: 2px;
}

.brand small,
.user-pill small,
.counter,
.muted,
.small,
.eyebrow {
  color: var(--muted);
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius);
  color: #fff;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), #11a17f);
  box-shadow: 0 12px 30px rgba(13, 124, 102, 0.26);
}

.eyebrow {
  text-transform: uppercase;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.12em;
}

.app-shell {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  background: rgba(255, 255, 255, 0.82);
  border-right: 1px solid var(--line);
  backdrop-filter: blur(20px);
  overflow-y: auto;
}

.sidebar nav {
  display: grid;
  gap: 12px;
  padding: 10px;
}

.nav-group {
  display: grid;
  gap: 6px;
}

.nav-group-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  border: 0;
  border-radius: var(--radius);
  background: transparent;
  padding: 10px 10px;
  color: #718096;
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  cursor: pointer;
  text-align: left;
}

.nav-group-title:hover,
.nav-group.open .nav-group-title {
  color: var(--primary-dark);
  background: rgba(13, 124, 102, 0.08);
}

.nav-chevron {
  font-size: 16px;
  line-height: 1;
  transform: rotate(0deg);
  transition: transform 0.18s ease;
}

.nav-group.open .nav-chevron {
  transform: rotate(90deg);
}

.nav-submenu {
  display: none;
  gap: 5px;
  padding-left: 6px;
}

.nav-group.open .nav-submenu {
  display: grid;
}

.sidebar nav a {
  display: grid;
  gap: 3px;
  padding: 10px 12px 10px 16px;
  border-radius: var(--radius);
  color: #334155;
  border: 1px solid transparent;
  position: relative;
}

.sidebar nav a:hover,
.sidebar nav a.active {
  background: var(--primary-soft);
  color: var(--primary-dark);
  border-color: rgba(13, 124, 102, 0.16);
}

.sidebar nav a.active::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 11px;
  bottom: 11px;
  width: 3px;
  border-radius: 999px;
  background: var(--primary);
}

.sidebar nav small {
  color: inherit;
  opacity: 0.72;
}

.main-area {
  padding: 22px;
}

.topbar {
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 22px;
}

.topbar > div:first-child {
  display: grid;
  gap: 3px;
}

.user-pill {
  gap: 12px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 8px 8px 8px 16px;
  box-shadow: 0 10px 28px rgba(20, 32, 51, 0.06);
}

.user-pill span {
  font-weight: 700;
}

.user-pill a {
  background: #142033;
  color: #fff;
  border-radius: 999px;
  padding: 8px 12px;
  font-size: 13px;
}

.hero-panel,
.module-head {
  justify-content: space-between;
  gap: 24px;
  background:
    linear-gradient(135deg, rgba(13, 124, 102, 0.96), rgba(10, 46, 61, 0.94)),
    linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.16));
  color: #fff;
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
}

.hero-panel p,
.hero-panel .eyebrow,
.module-head p,
.module-head .eyebrow {
  color: rgba(255, 255, 255, 0.78);
}

.hero-metric {
  min-width: 220px;
  padding: 20px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.12);
}

.hero-metric span,
.metric-card span {
  display: block;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.hero-metric span {
  color: rgba(255, 255, 255, 0.76);
}

.hero-metric strong {
  display: block;
  margin-top: 8px;
  font-size: 28px;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin: 18px 0;
}

.metric-card,
.panel,
.modal-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 14px 34px rgba(20, 32, 51, 0.08);
}

.metric-card {
  padding: 20px;
}

.metric-card strong {
  display: block;
  margin: 8px 0 4px;
  font-size: 34px;
}

.metric-card small {
  color: var(--muted);
}

.metric-card.accent {
  color: #fff;
  background: linear-gradient(135deg, #d99b22, #b97515);
  border-color: transparent;
}

.metric-card.accent span,
.metric-card.accent small {
  color: rgba(255, 255, 255, 0.78);
}

.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.panel {
  padding: 20px;
}

.panel-head {
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
}

.panel h2 {
  margin: 0 0 4px;
  font-size: 20px;
}

.link {
  color: var(--primary);
  font-weight: 800;
}

.mini-list {
  display: grid;
  gap: 10px;
}

.mini-list > div {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-soft);
}

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

.report-card {
  display: grid;
  gap: 12px;
}

.report-card h2,
.report-card p {
  margin: 0;
}

.report-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.table-toolbar {
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 14px;
}

.module-actions,
.pagination {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
  flex-wrap: wrap;
}

.pagination {
  margin-top: 16px;
}

.search-box,
.stack-form label,
.grid-form label {
  display: grid;
  gap: 7px;
  color: #334155;
  font-size: 13px;
  font-weight: 800;
}

input,
select {
  width: 100%;
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  color: var(--ink);
  padding: 10px 12px;
  outline: none;
}

input:focus,
select:focus {
  border-color: rgba(13, 124, 102, 0.65);
  box-shadow: 0 0 0 4px rgba(13, 124, 102, 0.1);
}

.search-box {
  width: min(100%, 360px);
}

.table-wrap {
  width: 100%;
  overflow-x: auto;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 860px;
}

.data-table th,
.data-table td {
  padding: 13px 12px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: middle;
}

.data-table th {
  color: #475569;
  background: var(--surface-soft);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.data-table tbody tr:hover {
  background: #fbfdff;
}

.actions-col {
  width: 250px;
  text-align: right;
}

.actions-col form {
  display: inline;
}

.status {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  padding: 4px 9px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 800;
}

.status.good {
  color: var(--primary-dark);
  background: var(--primary-soft);
}

.status.warn {
  color: #9a5a00;
  background: #fff2d2;
}

.status.neutral {
  color: #475569;
  background: #eef2f7;
}

.btn,
.ghost-btn,
.icon-btn {
  border: 0;
  cursor: pointer;
  font-weight: 800;
  border-radius: var(--radius);
}

.btn {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  min-height: 44px;
  padding: 11px 16px;
}

.btn.primary {
  color: #fff;
  background: linear-gradient(135deg, var(--primary), #10a37f);
  box-shadow: 0 14px 28px rgba(13, 124, 102, 0.22);
}

.btn.light {
  color: var(--ink);
  background: #eef3f8;
}

.btn.wide {
  width: 100%;
}

.ghost-btn {
  color: var(--danger);
  background: #fff1f1;
  padding: 8px 10px;
}

.ghost-btn.neutral {
  color: #334155;
  background: #eef3f8;
}

.ghost-btn.edit {
  color: var(--primary-dark);
  background: var(--primary-soft);
}

.locked-note {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  padding: 6px 10px;
  border-radius: var(--radius);
  color: #475569;
  background: #eef2f7;
  font-size: 12px;
  font-weight: 800;
}

.icon-btn {
  width: 38px;
  height: 38px;
  color: var(--ink);
  background: #eef3f8;
}

.stack-form {
  display: grid;
  gap: 14px;
  margin-top: 22px;
}

.grid-form {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.grid-form.compact-form {
  grid-template-columns: repeat(5, minmax(140px, 1fr));
  align-items: end;
}

.form-actions {
  grid-column: 1 / -1;
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 8px;
}

.grade-table input {
  min-width: 84px;
}

.grade-table td:first-child {
  color: var(--muted);
  font-weight: 800;
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: grid;
  place-items: center;
  padding: 22px;
  background: rgba(15, 23, 42, 0.42);
}

.modal-backdrop[hidden] {
  display: none;
}

.modal-card {
  width: min(100%, 860px);
  max-height: calc(100vh - 44px);
  overflow-y: auto;
  padding: 22px;
}

.detail-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.detail-item {
  display: grid;
  gap: 5px;
  padding: 13px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-soft);
}

.detail-item span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.detail-item strong {
  overflow-wrap: anywhere;
}

.alert {
  border-radius: var(--radius);
  padding: 13px 15px;
  margin-bottom: 16px;
  font-weight: 700;
}

.alert.success {
  color: var(--primary-dark);
  background: var(--primary-soft);
  border: 1px solid rgba(13, 124, 102, 0.16);
}

.alert.danger {
  color: #8d2525;
  background: #fff0f0;
  border: 1px solid rgba(194, 65, 65, 0.18);
}

.empty,
.empty-cell {
  color: var(--muted);
  text-align: center;
  padding: 22px;
}

@media (max-width: 1040px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
    height: auto;
  }

  .sidebar nav {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-items: start;
  }

  .metric-grid,
  .dashboard-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 680px) {
  .main-area,
  .auth-card,
  .hero-panel,
  .module-head,
  .panel {
    padding: 16px;
  }

  .topbar,
  .hero-panel,
  .module-head,
  .table-toolbar,
  .mini-list > div {
    align-items: stretch;
    flex-direction: column;
  }

  .metric-grid,
  .dashboard-grid,
  .grid-form,
  .grid-form.compact-form,
  .detail-grid,
  .sidebar nav {
    grid-template-columns: 1fr;
  }

  .hero-metric,
  .search-box {
    width: 100%;
  }

  .user-pill {
    border-radius: var(--radius);
    flex-wrap: wrap;
  }
}