/* Design system: palette + motion (reduce motion respected) */

:root {
  /* Row 1 — warm & green */
  --palette-red-magma: #ff3d32;
  --palette-rose-flame: #ff1f8f;
  --palette-volcanic-orange: #ff6b0a;
  --palette-golden-yellow: #e8a317;
  --palette-sunny-yellow: #ffe135;
  --palette-signal-green: #9ae619;
  --palette-pure-green: #22c55e;
  --palette-ocean-green: #00c9a7;

  /* Row 2 — cool & pastel */
  --palette-amethyst-violet: #7b68a6;
  --palette-lilac-planet: #8b7fff;
  --palette-lilac-garden: #e8deff;
  --palette-lilac-haze: #f5f2ff;
  --palette-gentle-rose: #ffc8dd;
  --palette-morning-blue: #8bb4ff;
  --palette-aqua-blue: #2eb5ff;
  --palette-digital-blue: #1e40af;

  /* Row 3 — neutrals */
  --palette-dark-side: #1a1d24;
  --palette-boring-grey: #8b909a;
  --palette-dusty-grey: #d4d7dc;
  --palette-moon-light: #f2f3f5;

  /* Row 4 — accent & primaries */
  --palette-acid-green: #bfff00;
  --palette-purple-space: #7c3aed;
  --palette-deep-purple: #1e0b3d;
  --palette-total-black: #0a0a0c;
  --palette-pure-white: #ffffff;

  /* Semantic (Bootstrap 5.3) */
  --bs-primary: var(--palette-digital-blue);
  --bs-primary-rgb: 30, 64, 175;
  --bs-secondary: var(--palette-amethyst-violet);
  --bs-secondary-rgb: 123, 104, 166;
  --bs-success: var(--palette-pure-green);
  --bs-success-rgb: 34, 197, 94;
  --bs-info: var(--palette-aqua-blue);
  --bs-info-rgb: 46, 181, 255;
  --bs-warning: var(--palette-golden-yellow);
  --bs-warning-rgb: 232, 163, 23;
  --bs-danger: var(--palette-red-magma);
  --bs-danger-rgb: 255, 61, 50;
  --bs-light: var(--palette-moon-light);
  --bs-light-rgb: 242, 243, 245;
  --bs-dark: var(--palette-dark-side);
  --bs-dark-rgb: 26, 29, 36;
  --bs-body-bg: var(--palette-lilac-haze);
  --bs-body-color: var(--palette-dark-side);
  --bs-border-radius: 0.75rem;
  --bs-border-radius-lg: 1rem;
  --bs-link-color: var(--palette-digital-blue);
  --bs-link-hover-color: var(--palette-purple-space);

  /* App chrome */
  --app-nav-accent: var(--palette-ocean-green);
  --app-shadow-sm: 0 2px 8px rgba(30, 11, 61, 0.08);
  --app-shadow-md: 0 8px 24px rgba(30, 11, 61, 0.12);
  --app-shadow-glow: 0 0 0 1px rgba(0, 201, 167, 0.25), 0 12px 40px rgba(30, 64, 175, 0.15);
  --app-transition: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
}

@media (prefers-reduced-motion: reduce) {
  :root {
    --app-transition: 0.01ms;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Typography */
.app-body {
  font-family: "Outfit", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  min-height: 100vh;
  background-color: var(--bs-body-bg);
  background-image:
    radial-gradient(ellipse 120% 80% at 100% -20%, rgba(139, 127, 255, 0.18), transparent 50%),
    radial-gradient(ellipse 90% 60% at -10% 100%, rgba(0, 201, 167, 0.12), transparent 45%),
    linear-gradient(180deg, var(--palette-lilac-haze) 0%, var(--palette-moon-light) 100%);
  background-attachment: fixed;
}

.app-main {
  padding-bottom: 2.5rem;
}

/* ——— Motion ——— */
@keyframes app-fade-up {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes app-pulse-soft {
  0%,
  100% {
    box-shadow: 0 0 0 0 rgba(0, 201, 167, 0.35);
  }
  50% {
    box-shadow: 0 0 0 10px rgba(0, 201, 167, 0);
  }
}

.app-animate-in {
  animation: app-fade-up 0.55s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.app-animate-in-delay-1 {
  animation-delay: 0.06s;
}

.app-animate-in-delay-2 {
  animation-delay: 0.12s;
}

.app-animate-in-delay-3 {
  animation-delay: 0.18s;
}

/* Stagger children (lists of cards) */
.app-stagger > * {
  animation: app-fade-up 0.5s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.app-stagger > *:nth-child(1) {
  animation-delay: 0.02s;
}
.app-stagger > *:nth-child(2) {
  animation-delay: 0.08s;
}
.app-stagger > *:nth-child(3) {
  animation-delay: 0.14s;
}
.app-stagger > *:nth-child(4) {
  animation-delay: 0.2s;
}
.app-stagger > *:nth-child(5) {
  animation-delay: 0.26s;
}
.app-stagger > *:nth-child(6) {
  animation-delay: 0.32s;
}
.app-stagger > *:nth-child(n + 7) {
  animation-delay: 0.38s;
}

/* ——— Admin navbar ——— */
.app-navbar {
  background: linear-gradient(135deg, var(--palette-deep-purple) 0%, var(--palette-dark-side) 55%, #252a35 100%);
  box-shadow: var(--app-shadow-md);
  border-bottom: 3px solid transparent;
  border-image: linear-gradient(
      90deg,
      var(--palette-ocean-green),
      var(--palette-lilac-planet),
      var(--palette-aqua-blue)
    )
    1;
  padding-top: 0.35rem;
  padding-bottom: 0.35rem;
}

.app-navbar .navbar-brand {
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--palette-pure-white) !important;
  transition: color var(--app-transition), transform var(--app-transition);
}

.app-navbar .navbar-brand:hover {
  color: var(--palette-signal-green) !important;
  transform: translateY(-1px);
}

.app-navbar .nav-link {
  color: rgba(255, 255, 255, 0.88) !important;
  border-radius: 0.5rem;
  margin: 0 0.1rem;
  padding: 0.45rem 0.75rem !important;
  transition:
    color var(--app-transition),
    background var(--app-transition),
    transform var(--app-transition);
}

.app-navbar .nav-link:hover {
  color: var(--palette-pure-white) !important;
  background: rgba(139, 127, 255, 0.2);
  transform: translateY(-1px);
}

.app-navbar .navbar-toggler {
  border-color: rgba(255, 255, 255, 0.35);
}

/* ——— Buttons ——— */
.btn-primary {
  font-weight: 600;
  border: none;
  box-shadow: 0 4px 14px rgba(30, 64, 175, 0.35);
  transition:
    transform var(--app-transition),
    box-shadow var(--app-transition),
    filter var(--app-transition);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 22px rgba(30, 64, 175, 0.45);
  filter: brightness(1.05);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  font-weight: 600;
  border: none;
  transition: transform var(--app-transition), box-shadow var(--app-transition);
}

.btn-secondary:hover {
  transform: translateY(-2px);
  box-shadow: var(--app-shadow-sm);
}

.btn-outline-secondary {
  border-width: 2px;
  font-weight: 500;
  transition: all var(--app-transition);
}

.btn-outline-secondary:hover {
  border-color: var(--palette-amethyst-violet);
  background: var(--palette-lilac-garden);
  color: var(--palette-dark-side);
}

/* ——— Cards (admin main) ——— */
.app-main .card {
  border: none;
  border-radius: var(--bs-border-radius-lg);
  box-shadow: var(--app-shadow-sm);
  overflow: hidden;
  transition:
    transform var(--app-transition),
    box-shadow var(--app-transition);
}

.app-main .card:not(.lesson-sidebar-card):hover {
  transform: translateY(-4px);
  box-shadow: var(--app-shadow-glow);
}

.app-main .card-footer {
  background: linear-gradient(180deg, var(--palette-moon-light) 0%, var(--palette-pure-white) 100%);
  border-top: 1px solid var(--palette-dusty-grey);
}

/* ——— Alerts ——— */
.alert {
  border: none;
  border-radius: var(--bs-border-radius);
  border-left: 4px solid currentColor;
  box-shadow: var(--app-shadow-sm);
  animation: app-fade-up 0.4s ease both;
}

.alert-primary {
  border-left-color: var(--palette-digital-blue);
  background: linear-gradient(90deg, rgba(30, 64, 175, 0.08), var(--palette-pure-white));
}

.alert-success {
  border-left-color: var(--palette-pure-green);
  background: linear-gradient(90deg, rgba(34, 197, 94, 0.1), var(--palette-pure-white));
}

.alert-danger {
  border-left-color: var(--palette-red-magma);
  background: linear-gradient(90deg, rgba(255, 61, 50, 0.08), var(--palette-pure-white));
}

.alert-warning {
  border-left-color: var(--palette-volcanic-orange);
  background: linear-gradient(90deg, rgba(255, 107, 10, 0.1), var(--palette-pure-white));
}

.alert-info {
  border-left-color: var(--palette-aqua-blue);
  background: linear-gradient(90deg, rgba(46, 181, 255, 0.1), var(--palette-pure-white));
}

/* ——— Forms ——— */
.form-control:focus {
  border-color: var(--palette-lilac-planet);
  box-shadow: 0 0 0 0.2rem rgba(139, 127, 255, 0.25);
}

/* ——— Headings ——— */
.app-main h1,
.app-main h2,
.app-main h3 {
  font-weight: 700;
  color: var(--palette-deep-purple);
  letter-spacing: -0.02em;
}

/* Auth: full-page background on body (see .app-body.app-auth-standalone) */
.app-body.app-auth-standalone {
  background-image:
    radial-gradient(ellipse 100% 80% at 50% -30%, rgba(124, 58, 237, 0.35), transparent 55%),
    radial-gradient(ellipse 80% 60% at 100% 80%, rgba(0, 201, 167, 0.2), transparent 50%),
    linear-gradient(160deg, var(--palette-deep-purple) 0%, var(--palette-dark-side) 45%, #2a1f4a 100%);
  background-color: var(--palette-deep-purple);
  background-attachment: fixed;
}

/* ——— Auth / login ——— */
.app-auth-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 2rem 0;
}

.app-auth-page .card {
  border: none;
  border-radius: 1.25rem;
  box-shadow: var(--app-shadow-glow);
  animation: app-fade-up 0.65s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.app-auth-page .card-title {
  background: linear-gradient(90deg, var(--palette-digital-blue), var(--palette-purple-space));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
}

.app-auth-page .btn-primary {
  animation: app-pulse-soft 2.5s ease-in-out infinite;
}

@media (prefers-reduced-motion: reduce) {
  .app-auth-page .btn-primary {
    animation: none;
  }
}

/* ——— Public lesson shell ——— */
.public-shell {
  font-family: "Outfit", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: linear-gradient(180deg, var(--palette-lilac-haze) 0%, var(--palette-pure-white) 35%, var(--palette-moon-light) 100%);
  min-height: 100vh;
}

.public-shell.embed-body {
  background: var(--palette-pure-white);
  min-height: auto;
}

.public-navbar {
  background: linear-gradient(90deg, var(--palette-pure-white) 0%, var(--palette-lilac-garden) 100%) !important;
  border-bottom: 2px solid var(--palette-dusty-grey) !important;
  box-shadow: var(--app-shadow-sm);
}

.public-navbar .navbar-brand {
  font-weight: 700;
  background: linear-gradient(90deg, var(--palette-digital-blue), var(--palette-ocean-green));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent !important;
  -webkit-text-fill-color: transparent;
}

.public-shell main:not(.embed-mode) {
  animation: app-fade-up 0.5s ease both;
}

.public-shell h1 {
  font-weight: 700;
  color: var(--palette-deep-purple);
  letter-spacing: -0.02em;
}

/* Tables / pagination polish inside admin */
.app-main .table {
  box-shadow: var(--app-shadow-sm);
  border-radius: var(--bs-border-radius);
  overflow: hidden;
}

.app-main .page-link {
  border-radius: 0.5rem !important;
  margin: 0 0.15rem;
  transition: transform var(--app-transition), background var(--app-transition);
}

.app-main .page-link:hover {
  transform: translateY(-1px);
  background: var(--palette-lilac-garden);
  color: var(--palette-deep-purple);
}

.app-main .page-item.active .page-link {
  background: linear-gradient(135deg, var(--palette-digital-blue), var(--palette-purple-space));
  border-color: transparent;
}