/* Shared app-page UI (auth, dashboard, courses, admin, …) */

body.app-surface {
  background: linear-gradient(180deg, #f7f4ef 0%, #f0ebe2 50%, #f7f4ef 100%);
  color: var(--nh-ink);
}

body.app-surface h1,
body.app-surface h2,
body.app-surface h3 {
  font-family: var(--nh-font-display);
}

main.container.main-content.app-wide {
  max-width: 1320px;
  padding-top: 1.2rem;
  padding-bottom: 4rem;
}

.nh-page {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 1.35rem;
}

.nh-surface,
.nh-card {
  position: relative;
  border: 1px solid var(--nh-border);
  background: var(--nh-surface);
  box-shadow: var(--nh-shadow-soft);
  border-radius: var(--nh-radius-lg);
}

.nh-kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.42rem 0.82rem;
  border-radius: 999px;
  background: var(--nh-accent-soft);
  color: var(--nh-accent-dark);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.nh-kicker::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--nh-ink);
}

.nh-title {
  margin: 0;
  font-family: var(--nh-font-display);
  color: var(--nh-ink);
  line-height: 0.98;
  letter-spacing: -0.04em;
}

.nh-subtitle {
  margin: 0;
  color: var(--nh-ink-soft);
  line-height: 1.65;
}

/* Unified buttons — use across the app */
.nh-btn,
a.nh-btn,
button.nh-btn,
.hero-btn,
a.hero-btn,
.dashboard-btn,
a.dashboard-btn,
.home-btn,
a.home-btn,
.course-action,
a.course-action,
.auth-submit,
button.auth-submit,
.lesson-action-primary,
a.lesson-action-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  min-height: 48px;
  padding: 0.78rem 1.2rem;
  border-radius: 999px;
  border: 1px solid transparent;
  text-decoration: none !important;
  font-weight: 600;
  font-size: 0.96rem;
  line-height: 1.2;
  cursor: pointer;
  transition:
    transform 0.18s ease,
    box-shadow 0.18s ease,
    background-color 0.18s ease,
    color 0.18s ease,
    border-color 0.18s ease;
}

.nh-btn.primary,
.hero-btn.primary,
.dashboard-btn.primary,
.home-btn.primary,
.course-action,
.auth-submit,
.lesson-action-primary {
  background: #311b14;
  color: #fffaf4 !important;
  box-shadow: 0 10px 22px rgba(49, 27, 20, 0.18);
}

.nh-btn.secondary,
.hero-btn.secondary,
.dashboard-btn.secondary,
.home-btn.secondary {
  background: #ede6d8;
  border-color: rgba(49, 27, 20, 0.18);
  color: #311b14 !important;
  box-shadow: none;
}

.nh-btn.primary:hover,
.nh-btn.primary:focus-visible,
.hero-btn.primary:hover,
.dashboard-btn.primary:hover,
.home-btn.primary:hover,
.course-action:hover,
.auth-submit:hover,
.lesson-action-primary:hover {
  background: #24140f;
  color: #fffaf4 !important;
  transform: translateY(-1px);
  box-shadow: 0 14px 26px rgba(49, 27, 20, 0.22);
}

.nh-btn.secondary:hover,
.nh-btn.secondary:focus-visible,
.hero-btn.secondary:hover,
.dashboard-btn.secondary:hover,
.home-btn.secondary:hover {
  background: #e4dccb;
  color: #311b14 !important;
  transform: translateY(-1px);
}

.reveal-up {
  opacity: 0;
  transform: translateY(14px);
  animation: nhReveal 0.55s cubic-bezier(0.22, 0.8, 0.24, 1) forwards;
  animation-delay: var(--delay, 0ms);
}

/* Unified surface cards (dashboard / lesson / profile) */
.surface-card {
  position: relative;
  isolation: isolate;
  border: 1px solid var(--nh-border);
  border-radius: var(--nh-radius-lg);
  padding: 1.15rem;
  overflow: hidden;
  background: var(--nh-surface-card);
  box-shadow: var(--nh-surface-highlight), var(--nh-shadow-soft);
  transition:
    transform 0.28s ease,
    box-shadow 0.28s ease,
    border-color 0.28s ease;
}

.surface-card:hover,
.surface-card:focus-within {
  transform: translateY(-2px);
  border-color: var(--nh-border-strong);
  box-shadow:
    var(--nh-surface-highlight),
    0 22px 44px rgba(16, 8, 6, 0.11);
}

.surface-card .section-head {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.35rem;
  margin: -1.15rem -1.15rem 1rem;
  padding: 1.05rem 1.15rem 0.95rem;
  border-bottom: 1px solid rgba(49, 27, 20, 0.1);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.42), rgba(255, 255, 255, 0.08));
}

.surface-card .section-head--row {
  flex-direction: row;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem;
}

.surface-card .section-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.32rem 0.7rem;
  border-radius: 999px;
  background: rgba(49, 27, 20, 0.08);
  color: var(--nh-ink);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.surface-card .section-head h2,
.surface-card .section-head h3 {
  margin: 0.4rem 0 0;
  font-family: var(--nh-font-display);
  font-size: clamp(1.35rem, 2.4vw, 1.55rem);
  color: var(--nh-ink);
  line-height: 1.2;
}

.surface-card .section-head p {
  margin: 0.2rem 0 0;
  color: var(--nh-ink-soft);
  line-height: 1.5;
  font-size: 0.92rem;
}

.surface-card > .section-meta:first-child {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem;
  margin: -1.15rem -1.15rem 1rem;
  padding: 1.05rem 1.15rem 0.95rem;
  border-bottom: 1px solid rgba(49, 27, 20, 0.1);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.42), rgba(255, 255, 255, 0.08));
}

.surface-empty {
  display: grid;
  gap: 0.85rem;
  padding: 1rem 1.05rem;
  border-radius: var(--nh-radius-md);
  border: 1px dashed rgba(49, 27, 20, 0.16);
  background: var(--nh-surface-empty);
}

.surface-empty h3 {
  margin: 0 0 0.35rem;
  font-family: var(--nh-font-display);
  color: var(--nh-ink);
}

.surface-empty p {
  margin: 0;
  color: var(--nh-ink-soft);
  line-height: 1.55;
  max-width: 48ch;
}

/* Stagger children after the card itself reveals */
.surface-card.reveal-up .surface-stagger > * {
  opacity: 0;
  transform: translateY(10px);
  animation: nhRevealSoft 0.5s cubic-bezier(0.22, 0.8, 0.24, 1) forwards;
}

.surface-card.reveal-up .surface-stagger > *:nth-child(1) { animation-delay: calc(var(--delay, 0ms) + 90ms); }
.surface-card.reveal-up .surface-stagger > *:nth-child(2) { animation-delay: calc(var(--delay, 0ms) + 135ms); }
.surface-card.reveal-up .surface-stagger > *:nth-child(3) { animation-delay: calc(var(--delay, 0ms) + 180ms); }
.surface-card.reveal-up .surface-stagger > *:nth-child(4) { animation-delay: calc(var(--delay, 0ms) + 225ms); }
.surface-card.reveal-up .surface-stagger > *:nth-child(5) { animation-delay: calc(var(--delay, 0ms) + 270ms); }
.surface-card.reveal-up .surface-stagger > *:nth-child(6) { animation-delay: calc(var(--delay, 0ms) + 315ms); }
.surface-card.reveal-up .surface-stagger > *:nth-child(7) { animation-delay: calc(var(--delay, 0ms) + 360ms); }
.surface-card.reveal-up .surface-stagger > *:nth-child(8) { animation-delay: calc(var(--delay, 0ms) + 405ms); }
.surface-card.reveal-up .surface-stagger > *:nth-child(9) { animation-delay: calc(var(--delay, 0ms) + 450ms); }
.surface-card.reveal-up .surface-stagger > *:nth-child(10) { animation-delay: calc(var(--delay, 0ms) + 495ms); }
.surface-card.reveal-up .surface-stagger > *:nth-child(11) { animation-delay: calc(var(--delay, 0ms) + 540ms); }
.surface-card.reveal-up .surface-stagger > *:nth-child(12) { animation-delay: calc(var(--delay, 0ms) + 585ms); }
.surface-card.reveal-up .surface-stagger > *:nth-child(n+13) { animation-delay: calc(var(--delay, 0ms) + 630ms); }

@media (prefers-reduced-motion: reduce) {
  .reveal-up {
    animation: none !important;
    opacity: 1;
    transform: none;
  }

  .surface-card.reveal-up .surface-stagger > * {
    animation: none !important;
    opacity: 1;
    transform: none;
  }

  .surface-card,
  .surface-card:hover,
  .surface-card:focus-within {
    transition: none !important;
    transform: none !important;
  }

  .nh-btn,
  .hero-btn,
  .dashboard-btn,
  .home-btn,
  .course-action,
  .auth-submit {
    transition: none !important;
  }
}

@keyframes nhReveal {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes nhRevealSoft {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Admin */
.admin-page {
  gap: 1.1rem;
}

.admin-hero {
  padding: clamp(1.25rem, 2.8vw, 1.85rem);
  background: linear-gradient(140deg, #faf7f2, #ede6d8);
}

.admin-hero h1 {
  margin: 0.75rem 0 0.4rem;
  font-family: var(--nh-font-display);
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  letter-spacing: -0.03em;
}

.admin-hero p {
  margin: 0;
  color: var(--nh-ink-soft);
  max-width: 58ch;
}

.admin-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
  justify-content: space-between;
}

.admin-toolbar h2 {
  margin: 0;
  font-family: var(--nh-font-display);
  font-size: 1.35rem;
}

.admin-panel {
  padding: 1rem;
  overflow: hidden;
}

.admin-cards {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.admin-course-card {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--nh-border);
  background: rgba(255, 252, 248, 0.92);
  border-radius: 22px;
  overflow: hidden;
  min-height: 100%;
}

.admin-course-cover {
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 5 / 4;
  background: linear-gradient(155deg, #faf7f2 0%, #efe6d8 55%, #e4dccb 100%);
  overflow: hidden;
}

.admin-course-cover img {
  width: auto;
  height: auto;
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  display: block;
}

.admin-course-body {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding: 1rem;
  flex: 1;
}

.admin-course-body h3 {
  margin: 0;
  font-size: 1.15rem;
  line-height: 1.25;
}

.admin-course-body p {
  margin: 0;
  color: var(--nh-ink-soft);
  font-size: 0.9rem;
  line-height: 1.5;
  flex: 1;
}

.admin-table {
  margin: 0;
  --bs-table-bg: transparent;
  --bs-table-striped-bg: rgba(49, 27, 20, 0.03);
  --bs-table-hover-bg: rgba(49, 27, 20, 0.05);
  --bs-table-border-color: var(--nh-border);
  color: var(--nh-ink);
}

.admin-table thead th {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--nh-ink-muted);
  font-weight: 700;
  border-bottom-width: 1px;
  white-space: nowrap;
}

.admin-table td {
  vertical-align: middle;
}

.admin-table-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.admin-form {
  display: grid;
  gap: 1rem;
  padding: 1.15rem;
  padding-bottom: 5.5rem;
}

.admin-form .form-label,
.admin-form label {
  font-weight: 600;
  color: var(--nh-ink);
  margin-bottom: 0.4rem;
}

.admin-form .form-control,
.admin-form textarea.form-control {
  min-height: 48px;
  border-radius: 16px;
  border: 1px solid var(--nh-border);
  background: rgba(255, 255, 255, 0.92);
  padding: 0.75rem 1rem;
  color: var(--nh-ink);
}

.admin-form .form-control:focus {
  border-color: rgba(49, 27, 20, 0.32);
  box-shadow: 0 0 0 4px rgba(49, 27, 20, 0.08);
}

.admin-form-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.admin-form-actions.is-sticky {
  position: sticky;
  bottom: 0.75rem;
  z-index: 5;
  margin: 0 -0.25rem;
  padding: 0.75rem;
  border: 1px solid var(--nh-border);
  border-radius: 18px;
  background: rgba(255, 252, 248, 0.96);
  box-shadow: 0 12px 28px rgba(16, 8, 6, 0.1);
  backdrop-filter: blur(10px);
}

.course-cover-picker {
  display: grid;
  grid-template-columns: 140px minmax(0, 1fr);
  gap: 0.85rem;
  align-items: start;
}

.course-cover-preview {
  width: 140px;
  height: 112px;
  border-radius: 16px;
  border: 1px solid rgba(49, 27, 20, 0.14);
  background: linear-gradient(155deg, #faf7f2 0%, #efe6d8 55%, #e4dccb 100%) center / contain no-repeat;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.55);
}

.course-cover-controls {
  min-width: 0;
}

@media (max-width: 640px) {
  .course-cover-picker {
    grid-template-columns: 1fr;
  }

  .course-cover-preview {
    width: 100%;
    height: 180px;
  }
}

.admin-video-preview {
  width: min(100%, 420px);
  aspect-ratio: 16 / 9;
  height: auto;
  border-radius: var(--nh-radius-sm);
  background: #120f0d;
}

.admin-empty {
  padding: 1.4rem;
  text-align: center;
  color: var(--nh-ink-soft);
}

.admin-table-wrap {
  display: none;
}

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

[data-students-panel] .admin-table tbody tr[hidden] {
  display: none;
}

/* Assignments */
.assignments-list {
  display: grid;
  gap: 1rem;
}

.assignment-card {
  padding: 1.15rem;
}

.assignment-card h3 {
  margin: 0 0 0.45rem;
  font-family: var(--nh-font-display);
  font-size: 1.25rem;
}

.assignment-card p {
  color: var(--nh-ink-soft);
  margin-bottom: 0.65rem;
}

.assignment-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  margin-bottom: 0.85rem;
  font-size: 0.9rem;
  color: var(--nh-ink-soft);
}

.assignment-meta strong {
  color: var(--nh-ink);
}

@media (max-width: 1100px) {
  .admin-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .admin-cards {
    grid-template-columns: 1fr;
  }

  .admin-cards {
    display: none;
  }

  .admin-table-wrap {
    display: block;
  }

  .admin-table-actions .btn,
  .admin-form-actions .btn,
  .nh-btn {
    flex: 1 1 auto;
  }
}

/* Custom confirm dialog */
body.nh-confirm-open {
  overflow: hidden;
}

.nh-confirm-root {
  position: fixed;
  inset: 0;
  z-index: 4000;
  display: grid;
  place-items: center;
  padding: 1rem;
}

.nh-confirm-root[hidden] {
  display: none !important;
}

.nh-confirm-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(25, 14, 10, 0.46);
  backdrop-filter: blur(4px);
}

.nh-confirm-dialog {
  position: relative;
  z-index: 1;
  width: min(100%, 420px);
  padding: 1.25rem 1.3rem 1.15rem;
  border-radius: 24px;
  border: 1px solid rgba(49, 27, 20, 0.14);
  background: linear-gradient(155deg, #faf7f2 0%, #f3eee4 52%, #ede6d8 100%);
  box-shadow: 0 24px 50px rgba(16, 8, 6, 0.22);
}

.nh-confirm-title {
  margin: 0 0 0.45rem;
  font-family: var(--nh-font-display, Lora, Georgia, serif);
  font-size: 1.35rem;
  line-height: 1.2;
  color: var(--nh-ink, #311b14);
}

.nh-confirm-message {
  margin: 0 0 1.1rem;
  color: var(--nh-ink-soft, rgba(49, 27, 20, 0.7));
  line-height: 1.5;
  font-size: 0.95rem;
}

.nh-confirm-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  justify-content: flex-end;
}

.nh-confirm-ok.is-danger,
.nh-btn.primary.nh-confirm-ok.is-danger {
  background: #9b3d3d;
  border-color: #9b3d3d;
  color: #fffaf4 !important;
}

.nh-confirm-ok.is-danger:hover,
.nh-btn.primary.nh-confirm-ok.is-danger:hover {
  background: #823333;
  border-color: #823333;
}

@media (max-width: 520px) {
  .nh-confirm-actions {
    flex-direction: column-reverse;
  }

  .nh-confirm-actions .nh-btn {
    width: 100%;
  }
}

/* Global toasts */
.nh-toast-host {
  position: fixed;
  z-index: 4500;
  right: 1rem;
  bottom: 1rem;
  display: grid;
  gap: 0.55rem;
  width: min(100% - 2rem, 360px);
  pointer-events: none;
}

.nh-toast {
  pointer-events: auto;
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
  padding: 0.85rem 0.9rem;
  border-radius: 18px;
  border: 1px solid rgba(49, 27, 20, 0.12);
  background: linear-gradient(155deg, #faf7f2 0%, #f3eee4 100%);
  color: var(--nh-ink, #311b14);
  box-shadow: 0 16px 36px rgba(16, 8, 6, 0.16);
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.nh-toast.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.nh-toast.is-hiding {
  opacity: 0;
  transform: translateY(8px);
}

.nh-toast--success {
  border-color: rgba(44, 140, 89, 0.28);
}

.nh-toast--error {
  border-color: rgba(176, 71, 71, 0.3);
}

.nh-toast--info {
  border-color: rgba(49, 27, 20, 0.14);
}

.nh-toast-text {
  flex: 1 1 auto;
  min-width: 0;
  font-size: 0.92rem;
  line-height: 1.45;
}

.nh-toast-close {
  flex: 0 0 auto;
  width: 1.6rem;
  height: 1.6rem;
  border: 0;
  border-radius: 999px;
  background: rgba(49, 27, 20, 0.06);
  color: var(--nh-ink-soft, rgba(49, 27, 20, 0.7));
  font-size: 1.1rem;
  line-height: 1;
  cursor: pointer;
}

.nh-toast-close:hover {
  background: rgba(49, 27, 20, 0.1);
}