:root {
  color-scheme: light;
  --bg: #f5f6f8;
  --surface: #ffffff;
  --surface-muted: #eef1f4;
  --text: #18202a;
  --muted: #66717f;
  --border: #d9dee5;
  --accent: #2457d6;
  --accent-strong: #1843ad;
  --success: #147a43;
  --success-bg: #e5f5ec;
  --danger: #b42318;
  --danger-bg: #fdecea;
  --warning: #9a6700;
  --warning-bg: #fff4ce;
  --radius: 14px;
  --shadow: 0 1px 3px rgb(0 0 0 / 8%);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-size: 16px;
  line-height: 1.45;
}

a {
  color: var(--accent);
}

button,
select,
input {
  font: inherit;
}

button,
.btn,
select,
input[type="date"] {
  min-height: 48px;
}

button,
.btn {
  border: 1px solid transparent;
  border-radius: 12px;
  padding: 0.75rem 1rem;
  font-weight: 650;
  cursor: pointer;
  touch-action: manipulation;
}

button:focus-visible,
a:focus-visible,
select:focus-visible,
input:focus-visible {
  outline: 3px solid rgb(36 87 214 / 30%);
  outline-offset: 2px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background: rgb(255 255 255 / 96%);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(10px);
}

.site-nav {
  width: min(100%, 960px);
  margin: 0 auto;
  padding: 0.7rem max(1rem, env(safe-area-inset-left));
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem 1rem;
}

.site-nav__home {
  margin-right: auto;
}

.site-nav__home {
  font-weight: 750;
  text-decoration: none;
}

.site-nav__user {
  color: var(--muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.page {
  width: min(100%, 960px);
  margin: 0 auto;
  padding: 1rem max(1rem, env(safe-area-inset-left))
    calc(1.5rem + env(safe-area-inset-bottom))
    max(1rem, env(safe-area-inset-right));
}

.page-header {
  margin-bottom: 1rem;
}

.page-header h1 {
  margin: 0 0 0.25rem;
  font-size: clamp(1.55rem, 6vw, 2.15rem);
  line-height: 1.15;
}

.page-header__meta,
.muted {
  color: var(--muted);
}

.messages {
  width: min(100%, 960px);
  margin: 0.75rem auto 0;
  padding: 0 max(1rem, env(safe-area-inset-left));
  list-style: none;
}

.messages li {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.75rem 1rem;
  box-shadow: var(--shadow);
}

.toolbar,
.filter-form {
  display: grid;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.field {
  display: grid;
  gap: 0.35rem;
}

.field label {
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 650;
}

select,
input[type="date"],
input[type="text"],
input[type="password"],
input[type="number"],
input[type="time"],
input[type="datetime-local"] {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
  color: var(--text);
  padding: 0.65rem 0.8rem;
}

.card-list {
  display: grid;
  gap: 0.85rem;
}

.lesson-card,
.student-card,
.auth-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.lesson-card {
  padding: 1rem;
}

.lesson-card__top,
.student-card__top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
}

.lesson-card h2,
.lesson-card h3,
.student-card h2 {
  margin: 0;
}

.lesson-card__time {
  font-size: 1.15rem;
  font-weight: 800;
}

.lesson-card__meta {
  margin: 0.35rem 0 0;
  color: var(--muted);
}

.lesson-card__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.5rem;
  margin-top: 0.9rem;
}

.stat {
  background: var(--surface-muted);
  border-radius: 10px;
  padding: 0.55rem 0.5rem;
  text-align: center;
}

.stat strong {
  display: block;
  font-size: 1.15rem;
}

.stat span {
  color: var(--muted);
  font-size: 0.78rem;
}

.badge {
  display: inline-flex;
  min-height: 30px;
  align-items: center;
  border-radius: 999px;
  padding: 0.25rem 0.6rem;
  font-size: 0.82rem;
  font-weight: 750;
  white-space: nowrap;
  background: var(--surface-muted);
}

.badge--yes,
.badge--present,
.badge--covered {
  background: var(--success-bg);
  color: var(--success);
}

.badge--no,
.badge--absent,
.badge--cancelled,
.badge--uncovered {
  background: var(--danger-bg);
  color: var(--danger);
}

.badge--unknown {
  background: var(--warning-bg);
  color: var(--warning);
}

.action-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.6rem;
  margin-top: 0.9rem;
}

.action-row form {
  margin: 0;
}

.action-row button,
.action-row .btn {
  width: 100%;
}

.btn-primary {
  background: var(--accent);
  color: white;
}

.btn-primary:hover {
  background: var(--accent-strong);
}

.btn-present {
  background: var(--success-bg);
  color: var(--success);
  border-color: rgb(20 122 67 / 22%);
}

.btn-present.is-active {
  background: var(--success);
  color: white;
}

.btn-absent {
  background: var(--danger-bg);
  color: var(--danger);
  border-color: rgb(180 35 24 / 22%);
}

.btn-absent.is-active {
  background: var(--danger);
  color: white;
}

.btn-secondary {
  background: var(--surface-muted);
  color: var(--text);
  border-color: var(--border);
}

.student-list {
  display: grid;
  gap: 0.75rem;
}

.student-card {
  padding: 0.9rem;
}

.student-card__name {
  font-size: 1.12rem;
  font-weight: 800;
}

.student-card__state {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.55rem;
}

.student-card__actions {
  margin-top: 0.75rem;
}

.bulk-actions {
  position: sticky;
  bottom: 0;
  z-index: 20;
  margin: 1rem -1rem calc(-1.5rem - env(safe-area-inset-bottom));
  padding: 0.75rem 1rem calc(0.75rem + env(safe-area-inset-bottom));
  display: grid;
  gap: 0.55rem;
  background: rgb(255 255 255 / 97%);
  border-top: 1px solid var(--border);
  box-shadow: 0 -8px 20px rgb(0 0 0 / 7%);
  backdrop-filter: blur(10px);
}

.bulk-actions form {
  margin: 0;
}

.bulk-actions button {
  width: 100%;
}

.section-title {
  margin: 1.25rem 0 0.7rem;
  font-size: 1rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.empty-state {
  padding: 1.25rem;
  text-align: center;
  color: var(--muted);
  background: var(--surface);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
}

.auth-card {
  max-width: 420px;
  margin: 8vh auto 0;
  padding: 1rem;
}

.auth-card form p {
  display: grid;
  gap: 0.35rem;
}

.auth-card button {
  width: 100%;
  background: var(--accent);
  color: white;
}

@media (min-width: 720px) {
  .page {
    padding-top: 1.5rem;
  }

  .toolbar,
  .filter-form {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: end;
  }

  .card-list--coach {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .student-card {
    display: grid;
    grid-template-columns: minmax(180px, 1fr) minmax(260px, auto);
    gap: 1rem;
    align-items: center;
  }

  .student-card__actions {
    margin-top: 0;
  }

  .bulk-actions {
    position: static;
    margin: 1.25rem 0 0;
    padding: 0;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    background: transparent;
    border: 0;
    box-shadow: none;
    backdrop-filter: none;
  }
}


.report-list {
  display: grid;
  gap: 1rem;
}

.report-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1rem;
}

.report-card__top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
}

.report-card h2,
.report-card h3 {
  margin: 0;
}

.report-card__meta,
.report-card__period {
  margin: 0.35rem 0 0;
  color: var(--muted);
}

.report-allowances {
  display: grid;
  gap: 0.75rem;
  margin-top: 1rem;
}

.report-allowance {
  border-top: 1px solid var(--border);
  padding-top: 0.85rem;
}

.report-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.5rem;
  margin-top: 0.65rem;
}

.report-holds {
  margin-top: 1rem;
  border-top: 1px solid var(--border);
  padding-top: 0.85rem;
}

.report-holds ul {
  margin: 0.5rem 0 0;
  padding-left: 1.25rem;
}

@media (min-width: 720px) {
  .report-stats {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
}


.manager-operation-grid {
  display: grid;
  gap: 1rem;
  margin-top: 1rem;
}

.manager-nav-card {
  display: block;
  color: var(--text);
  text-decoration: none;
}

.manager-nav-card:hover {
  border-color: var(--accent);
}

.manager-nav-card p {
  margin-bottom: 0;
  color: var(--muted);
}

.manager-form {
  display: grid;
  gap: 0.85rem;
}

.manager-form p {
  display: grid;
  gap: 0.35rem;
  margin: 0;
}

.manager-form select,
.manager-form input {
  width: 100%;
}

.manager-actions {
  margin-bottom: 1rem;
}

.form-error {
  color: var(--danger);
  font-size: 0.9rem;
}

.audit-filter {
  grid-template-columns: 1fr;
}

.audit-event details {
  margin-top: 0.75rem;
}

.audit-payload {
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  background: var(--surface-muted);
  border-radius: 10px;
  padding: 0.75rem;
  font-size: 0.82rem;
}

@media (min-width: 720px) {
  .manager-operation-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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


.account-primary-actions {
  grid-template-columns: minmax(0, 220px);
}

.account-balance-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.65rem;
  margin-top: 1rem;
}

.account-balance {
  background: var(--surface-muted);
  border-radius: 12px;
  padding: 0.75rem;
}

.account-balance span,
.account-balance small {
  display: block;
  color: var(--muted);
}

.account-balance strong {
  display: inline-block;
  margin-right: 0.25rem;
  font-size: 1.5rem;
}

.account-pagination {
  align-items: center;
}

.account-pagination__state {
  align-self: center;
  text-align: center;
  color: var(--muted);
}

@media (min-width: 720px) {
  .account-student-filter {
    grid-template-columns: minmax(240px, 1fr) auto;
  }

  .account-balance-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}