.nd-link { color: var(--nd-color-brand-700); font-weight: 650; text-underline-offset: 0.2em; }
.nd-link:hover { color: var(--nd-color-brand-900); }

.nd-btn {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  gap: var(--nd-space-2);
  border: 1px solid transparent;
  border-radius: var(--nd-radius-md);
  padding: 0.65rem 1rem;
  background: var(--nd-color-brand-700);
  color: #fff;
  font-weight: 720;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition: background var(--nd-transition-fast), border-color var(--nd-transition-fast), transform var(--nd-transition-fast);
}
.nd-btn:hover { background: var(--nd-color-brand-900); }
.nd-btn:active { transform: translateY(1px); }
.nd-btn:disabled, .nd-btn[aria-disabled="true"] { opacity: 0.5; cursor: not-allowed; transform: none; }
.nd-btn--secondary { border-color: var(--nd-color-ink-200); background: #fff; color: var(--nd-color-ink-900); }
.nd-btn--secondary:hover { border-color: var(--nd-color-brand-700); background: var(--nd-color-brand-50); }
.nd-btn--danger { background: var(--nd-color-danger-700); }
.nd-btn--danger:hover { background: #8f1720; }
.nd-btn--text { min-height: 40px; padding-inline: var(--nd-space-2); background: transparent; color: var(--nd-color-brand-700); }
.nd-btn--text:hover { background: var(--nd-color-brand-50); color: var(--nd-color-brand-900); }
.nd-btn--icon { width: 44px; padding: 0; }
.nd-btn--sm { min-height: 36px; padding: 0.45rem 0.75rem; font-size: var(--nd-text-sm); }
.nd-btn__spinner { width: 1rem; height: 1rem; border: 2px solid rgb(255 255 255 / 45%); border-top-color: #fff; border-radius: 50%; animation: nd-spin 0.8s linear infinite; }
@keyframes nd-spin { to { transform: rotate(360deg); } }

.nd-icon { width: 1.15em; height: 1.15em; flex: none; }

.nd-card { border: var(--nd-border); border-radius: var(--nd-radius-lg); background: var(--nd-color-surface); box-shadow: var(--nd-shadow-sm); }
.nd-card__header, .nd-card__body, .nd-card__footer { padding: var(--nd-space-5); }
.nd-card__header { border-bottom: var(--nd-border); }
.nd-card__footer { border-top: var(--nd-border); }
.nd-card__title { margin-bottom: var(--nd-space-1); font-size: var(--nd-text-lg); }
.nd-card__meta { margin: 0; color: var(--nd-color-ink-600); font-size: var(--nd-text-sm); }
.nd-card--interactive { transition: border-color var(--nd-transition-fast), box-shadow var(--nd-transition-fast), transform var(--nd-transition-fast); }
.nd-card--interactive:hover { border-color: var(--nd-color-brand-500); box-shadow: var(--nd-shadow-md); transform: translateY(-2px); }

.nd-badge { display: inline-flex; align-items: center; gap: var(--nd-space-1); min-height: 26px; border-radius: var(--nd-radius-pill); padding: 0.25rem 0.55rem; background: var(--nd-color-ink-100); color: var(--nd-color-ink-700); font-size: var(--nd-text-xs); font-weight: 760; }
.nd-badge--success { background: var(--nd-color-success-100); color: var(--nd-color-success-700); }
.nd-badge--warning { background: var(--nd-color-warning-100); color: var(--nd-color-warning-700); }
.nd-badge--danger { background: var(--nd-color-danger-100); color: var(--nd-color-danger-700); }
.nd-badge--info { background: var(--nd-color-info-100); color: var(--nd-color-info-700); }

.nd-alert { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: var(--nd-space-3); border: 1px solid var(--nd-color-info-100); border-left: 4px solid var(--nd-color-info-700); border-radius: var(--nd-radius-md); padding: var(--nd-space-4); background: #fff; }
.nd-alert--success { border-color: var(--nd-color-success-100); border-left-color: var(--nd-color-success-700); }
.nd-alert--warning { border-color: var(--nd-color-warning-100); border-left-color: var(--nd-color-warning-700); }
.nd-alert--danger { border-color: var(--nd-color-danger-100); border-left-color: var(--nd-color-danger-700); }
.nd-alert__title { margin-bottom: var(--nd-space-1); font-weight: 760; }
.nd-alert p { margin: 0; color: var(--nd-color-ink-700); }

.nd-field { display: grid; gap: var(--nd-space-2); }
.nd-field__label { font-weight: 700; }
.nd-field__required { color: var(--nd-color-danger-700); }
.nd-field__help, .nd-field__error { margin: 0; font-size: var(--nd-text-sm); }
.nd-field__help { color: var(--nd-color-ink-600); }
.nd-field__error { color: var(--nd-color-danger-700); font-weight: 620; }
.nd-input, .nd-select, .nd-textarea {
  width: 100%;
  min-height: 44px;
  border: var(--nd-border);
  border-radius: var(--nd-radius-md);
  background: #fff;
  color: var(--nd-color-ink-900);
  padding: 0.7rem 0.8rem;
  transition: border-color var(--nd-transition-fast), box-shadow var(--nd-transition-fast), background var(--nd-transition-fast);
}
.nd-input:hover, .nd-select:hover, .nd-textarea:hover { border-color: var(--nd-color-ink-400); }
.nd-input:focus, .nd-select:focus, .nd-textarea:focus { border-color: var(--nd-color-brand-700); outline: none; box-shadow: var(--nd-focus-ring); }
.nd-input[aria-invalid="true"], .nd-select[aria-invalid="true"], .nd-textarea[aria-invalid="true"] { border-color: var(--nd-color-danger-700); }
.nd-input:disabled, .nd-select:disabled, .nd-textarea:disabled { background: var(--nd-color-ink-50); color: var(--nd-color-ink-600); cursor: not-allowed; }
.nd-textarea { min-height: 8rem; resize: vertical; }
.nd-input-wrap { position: relative; }
.nd-input-wrap .nd-input { padding-left: 2.65rem; }
.nd-input-wrap .nd-icon { position: absolute; left: 0.85rem; top: 50%; transform: translateY(-50%); color: var(--nd-color-ink-600); pointer-events: none; }

.nd-choice { display: inline-flex; align-items: flex-start; gap: var(--nd-space-2); cursor: pointer; }
.nd-choice input { width: 1.15rem; height: 1.15rem; margin-top: 0.18rem; accent-color: var(--nd-color-brand-700); }
.nd-switch { display: inline-flex; align-items: center; gap: var(--nd-space-3); cursor: pointer; }
.nd-switch input { position: absolute; opacity: 0; }
.nd-switch__track { position: relative; width: 2.9rem; height: 1.65rem; border-radius: var(--nd-radius-pill); background: var(--nd-color-ink-300); transition: background var(--nd-transition-fast); }
.nd-switch__track::after { content: ""; position: absolute; top: 0.2rem; left: 0.2rem; width: 1.25rem; height: 1.25rem; border-radius: 50%; background: #fff; box-shadow: var(--nd-shadow-sm); transition: transform var(--nd-transition-fast); }
.nd-switch input:checked + .nd-switch__track { background: var(--nd-color-accent-700); }
.nd-switch input:checked + .nd-switch__track::after { transform: translateX(1.25rem); }
.nd-switch input:focus-visible + .nd-switch__track { box-shadow: var(--nd-focus-ring); }

.nd-nav { display: grid; gap: var(--nd-space-1); }
.nd-nav__link { display: flex; align-items: center; gap: var(--nd-space-3); min-height: 44px; border-radius: var(--nd-radius-md); padding: 0.65rem 0.75rem; color: rgb(255 255 255 / 82%); text-decoration: none; font-weight: 650; }
.nd-nav__link:hover { background: rgb(255 255 255 / 10%); color: #fff; }
.nd-nav__link[aria-current="page"] { background: #fff; color: var(--nd-color-brand-900); }

.nd-breadcrumb { display: flex; flex-wrap: wrap; align-items: center; gap: var(--nd-space-2); margin: 0; padding: 0; list-style: none; color: var(--nd-color-ink-600); font-size: var(--nd-text-sm); }
.nd-breadcrumb li + li::before { content: "/"; margin-right: var(--nd-space-2); color: var(--nd-color-ink-400); }

.nd-table-wrap { overflow-x: auto; border: var(--nd-border); border-radius: var(--nd-radius-lg); background: #fff; }
.nd-table { width: 100%; min-width: 720px; border-collapse: collapse; }
.nd-table th, .nd-table td { padding: 0.8rem 1rem; border-bottom: var(--nd-border); text-align: left; vertical-align: middle; }
.nd-table th { background: var(--nd-color-ink-50); color: var(--nd-color-ink-700); font-size: var(--nd-text-xs); letter-spacing: 0.04em; text-transform: uppercase; }
.nd-table tbody tr:hover { background: var(--nd-color-brand-50); }
.nd-table tbody tr:last-child td { border-bottom: 0; }

.nd-filterbar { display: flex; flex-wrap: wrap; gap: var(--nd-space-3); align-items: end; padding: var(--nd-space-4); border: var(--nd-border); border-radius: var(--nd-radius-lg); background: #fff; }
.nd-filterbar .nd-field { min-width: 12rem; flex: 1 1 12rem; }

.nd-pagination { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: var(--nd-space-3); }
.nd-pagination__list { display: flex; gap: var(--nd-space-1); margin: 0; padding: 0; list-style: none; }
.nd-pagination__link { display: inline-flex; min-width: 40px; min-height: 40px; align-items: center; justify-content: center; border: var(--nd-border); border-radius: var(--nd-radius-md); background: #fff; color: var(--nd-color-ink-900); text-decoration: none; font-weight: 650; }
.nd-pagination__link:hover { border-color: var(--nd-color-brand-700); }
.nd-pagination__link[aria-current="page"] { border-color: var(--nd-color-brand-700); background: var(--nd-color-brand-700); color: #fff; }

.nd-status { display: inline-flex; align-items: center; gap: var(--nd-space-2); font-weight: 700; }
.nd-status::before { content: ""; width: 0.65rem; height: 0.65rem; border-radius: 50%; background: currentColor; }
.nd-status--success { color: var(--nd-color-success-700); }
.nd-status--warning { color: var(--nd-color-warning-700); }
.nd-status--danger { color: var(--nd-color-danger-700); }
.nd-status--info { color: var(--nd-color-info-700); }

.nd-attendance { display: grid; gap: var(--nd-space-2); }
.nd-attendance__row { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: var(--nd-space-3); border: var(--nd-border); border-radius: var(--nd-radius-md); padding: var(--nd-space-3); background: #fff; }
.nd-attendance__name { font-weight: 700; }
.nd-attendance__meta { color: var(--nd-color-ink-600); font-size: var(--nd-text-sm); }
.nd-segmented { display: inline-flex; border: var(--nd-border); border-radius: var(--nd-radius-pill); padding: 0.2rem; background: var(--nd-color-ink-50); }
.nd-segmented button { min-height: 36px; border: 0; border-radius: var(--nd-radius-pill); padding: 0.45rem 0.7rem; background: transparent; color: var(--nd-color-ink-700); font-weight: 700; cursor: pointer; }
.nd-segmented button[aria-pressed="true"] { background: var(--nd-color-success-700); color: #fff; }
.nd-segmented button[data-state="absent"][aria-pressed="true"] { background: var(--nd-color-danger-700); }

.nd-empty { display: grid; place-items: center; min-height: 18rem; border: 1px dashed var(--nd-color-ink-300); border-radius: var(--nd-radius-lg); padding: var(--nd-space-8); background: #fff; text-align: center; }
.nd-empty__icon { display: grid; place-items: center; width: 4rem; height: 4rem; margin-bottom: var(--nd-space-4); border-radius: 50%; background: var(--nd-color-brand-50); color: var(--nd-color-brand-700); }

.nd-skeleton { border-radius: var(--nd-radius-sm); background: linear-gradient(90deg, var(--nd-color-ink-100) 25%, var(--nd-color-ink-50) 50%, var(--nd-color-ink-100) 75%); background-size: 200% 100%; animation: nd-shimmer 1.4s infinite; }
.nd-skeleton--line { width: 100%; height: 0.9rem; }
.nd-skeleton--title { width: 55%; height: 1.35rem; }
@keyframes nd-shimmer { to { background-position: -200% 0; } }

.nd-modal[hidden] { display: none; }
.nd-modal { position: fixed; inset: 0; z-index: var(--nd-z-modal); display: grid; place-items: center; padding: var(--nd-space-4); background: var(--nd-color-overlay); }
.nd-modal__dialog { width: min(100%, 34rem); max-height: min(88vh, 48rem); overflow-y: auto; border-radius: var(--nd-radius-xl); background: #fff; box-shadow: var(--nd-shadow-md); }
.nd-modal__header, .nd-modal__body, .nd-modal__footer { padding: var(--nd-space-5); }
.nd-modal__header { display: flex; align-items: center; justify-content: space-between; gap: var(--nd-space-4); border-bottom: var(--nd-border); }
.nd-modal__footer { display: flex; justify-content: flex-end; gap: var(--nd-space-3); border-top: var(--nd-border); }

.nd-notice-page { min-height: 72vh; display: grid; place-items: center; padding: var(--nd-space-8); }
.nd-notice-page__card { width: min(100%, 38rem); border: var(--nd-border); border-radius: var(--nd-radius-xl); padding: var(--nd-space-8); background: #fff; box-shadow: var(--nd-shadow-md); text-align: center; }
.nd-notice-page__code { color: var(--nd-color-brand-700); font-size: var(--nd-text-sm); font-weight: 800; letter-spacing: 0.1em; text-transform: uppercase; }

@media (max-width: 640px) {
  .nd-attendance__row { grid-template-columns: 1fr; }
  .nd-segmented { width: 100%; }
  .nd-segmented button { flex: 1; }
  .nd-filterbar { align-items: stretch; }
  .nd-filterbar .nd-field { min-width: 100%; }
  .nd-pagination { align-items: flex-start; flex-direction: column; }
}