:root {
  --pwa-shell-bg: rgba(15, 23, 42, 0.88);
  --pwa-shell-border: rgba(148, 163, 184, 0.24);
  --pwa-shell-text: #f8fafc;
  --pwa-shell-muted: rgba(226, 232, 240, 0.74);
  --pwa-shell-accent: linear-gradient(135deg, #38bdf8, #22c55e);
  --pwa-safe-bottom: env(safe-area-inset-bottom, 0px);
  --pwa-safe-top: env(safe-area-inset-top, 0px);
}

html {
  scroll-behavior: smooth;
  -webkit-tap-highlight-color: transparent;
}

[hidden] {
  display: none !important;
}

body {
  overscroll-behavior-y: none;
  width: 100%;
  max-width: 100%;
  overflow-x: clip;
}

body.pwa-standalone {
  min-height: 100dvh;
  padding-top: var(--pwa-safe-top);
}

@media (display-mode: standalone) {
  .pwa-install-card,
  .pwa-install-fab {
    display: none !important;
  }
}

body.pwa-nav-active .content-wrapper,
body.pwa-nav-active main#main,
body.pwa-nav-active .main-content {
  padding-bottom: calc(96px + var(--pwa-safe-bottom));
}

img[loading="lazy"] {
  content-visibility: auto;
}

.app-transition {
  position: fixed;
  inset: 0;
  z-index: 5000;
  pointer-events: none;
  opacity: 0;
  background:
    radial-gradient(circle at top, rgba(56, 189, 248, 0.16), transparent 35%),
    linear-gradient(180deg, rgba(15, 23, 42, 0.08), rgba(15, 23, 42, 0.58));
  backdrop-filter: blur(2px);
  transition: opacity 0.28s ease;
}

body.is-transitioning .app-transition {
  opacity: 1;
}

[data-reveal] {
  opacity: 0;
  transform: translate3d(0, 22px, 0) scale(0.985);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

[data-reveal].is-visible {
  opacity: 1;
  transform: translate3d(0, 0, 0) scale(1);
}

.pwa-install-card {
  position: fixed;
  left: 16px;
  right: 16px;
  bottom: calc(18px + var(--pwa-safe-bottom));
  z-index: 3000;
  display: grid;
  gap: 16px;
  padding: 18px;
  border-radius: 26px;
  background:
    linear-gradient(180deg, rgba(7, 12, 24, 0.94), rgba(11, 19, 35, 0.96)),
    var(--pwa-shell-bg);
  border: 1px solid var(--pwa-shell-border);
  color: var(--pwa-shell-text);
  box-shadow: 0 24px 70px rgba(2, 6, 23, 0.34);
  backdrop-filter: blur(20px);
}

body.pwa-nav-active .pwa-install-card {
  bottom: calc(108px + var(--pwa-safe-bottom));
}

.pwa-install-eyebrow {
  margin: 0 0 6px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: #7dd3fc;
}

.pwa-install-card h2 {
  margin: 0 0 6px;
  font-size: clamp(20px, 4.4vw, 28px);
  line-height: 1.05;
}

.pwa-install-card p {
  margin: 0;
  color: var(--pwa-shell-muted);
  line-height: 1.5;
}

.pwa-install-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.pwa-primary-btn,
.pwa-secondary-btn,
.pwa-install-fab {
  border: 0;
  border-radius: 16px;
  padding: 14px 18px;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

body.pwa-nav-active .pwa-install-fab {
  bottom: calc(108px + var(--pwa-safe-bottom));
}

.pwa-primary-btn {
  background: var(--pwa-shell-accent);
  color: #04111f;
  flex: 1;
}

.pwa-secondary-btn {
  background: rgba(255, 255, 255, 0.08);
  color: var(--pwa-shell-text);
}

.pwa-install-fab {
  position: fixed;
  right: 16px;
  bottom: calc(18px + var(--pwa-safe-bottom));
  z-index: 2900;
  background: linear-gradient(135deg, #0f172a, #1d4ed8);
  color: #eff6ff;
  box-shadow: 0 20px 48px rgba(15, 23, 42, 0.34);
}

.pwa-status-toast {
  position: fixed;
  left: 50%;
  bottom: calc(24px + var(--pwa-safe-bottom));
  transform: translateX(-50%);
  z-index: 3100;
  padding: 12px 16px;
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.9);
  color: #e2e8f0;
  border: 1px solid rgba(148, 163, 184, 0.28);
  box-shadow: 0 18px 40px rgba(15, 23, 42, 0.24);
}

body.pwa-nav-active .pwa-status-toast {
  bottom: calc(104px + var(--pwa-safe-bottom));
}

.mobile-app-nav {
  position: fixed;
  left: 12px;
  right: 12px;
  bottom: calc(12px + var(--pwa-safe-bottom));
  z-index: 2800;
  display: none;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
  padding: 10px;
  border-radius: 24px;
  background: rgba(9, 14, 25, 0.86);
  border: 1px solid rgba(148, 163, 184, 0.22);
  box-shadow: 0 24px 70px rgba(2, 6, 23, 0.3);
  backdrop-filter: blur(18px);
}

.mobile-app-link {
  min-height: 62px;
  display: grid;
  place-items: center;
  gap: 4px;
  padding: 8px 6px;
  border-radius: 18px;
  color: rgba(226, 232, 240, 0.76);
  text-decoration: none;
  text-align: center;
  transition: transform 0.18s ease, background 0.18s ease, color 0.18s ease;
}

.mobile-app-link:active {
  transform: scale(0.98);
}

.mobile-app-link:hover,
.mobile-app-link:focus-visible {
  color: #fff;
  background: rgba(255, 255, 255, 0.08);
  transform: translateY(-2px);
}

.mobile-app-link.is-active {
  color: #08111f;
  background: linear-gradient(135deg, #7dd3fc, #4ade80);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.34);
}

.mobile-app-link strong {
  font-size: 18px;
  line-height: 1;
}

.mobile-app-link span {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

@media (max-width: 992px) {
  .mobile-app-nav {
    display: grid;
  }

  .sidebar {
    width: min(88vw, 320px) !important;
    max-width: 320px;
  }

  .main-header {
    padding-top: calc(0.85rem + var(--pwa-safe-top));
  }

  .content-wrapper,
  main#main {
    padding-left: 14px !important;
    padding-right: 14px !important;
  }

  .card,
  .io-card,
  .attendance-card,
  .speaking-shell,
  .hero-card,
  .schedule-card,
  .pro-card {
    border-radius: 20px !important;
  }
}

@media (max-width: 768px) {
  .pwa-install-card {
    left: 12px;
    right: 12px;
    padding: 16px;
    border-radius: 22px;
  }

  .pwa-install-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .main-header,
  .header-left,
  .header-right {
    gap: 10px !important;
  }

  .header-right {
    flex-wrap: wrap;
  }

  .page-title {
    font-size: 1rem !important;
    line-height: 1.2;
  }

  .user-menu {
    min-width: 0;
  }

  .user-menu .user-name,
  .logo-text p {
    display: none !important;
  }
}

@media (max-width: 560px) {
  .mobile-app-nav {
    left: 8px;
    right: 8px;
    bottom: calc(8px + var(--pwa-safe-bottom));
    gap: 6px;
    padding: 8px;
    border-radius: 20px;
  }

  .mobile-app-link {
    min-height: 56px;
    padding: 6px 4px;
    border-radius: 14px;
  }

  .mobile-app-link strong {
    font-size: 15px;
  }

  .mobile-app-link span {
    font-size: 10px;
  }

  .pwa-install-card,
  .pwa-install-fab,
  .pwa-status-toast {
    bottom: calc(84px + var(--pwa-safe-bottom));
  }

  .pwa-status-toast {
    width: calc(100vw - 24px);
    text-align: center;
    white-space: normal;
  }

  .pwa-install-actions {
    grid-template-columns: 1fr;
  }

  .pwa-primary-btn,
  .pwa-secondary-btn,
  .pwa-install-fab {
    min-height: 48px;
  }

  .content-wrapper,
  main#main {
    padding-left: 10px !important;
    padding-right: 10px !important;
  }
}

@media (min-width: 768px) {
  .pwa-install-card {
    left: auto;
    width: min(440px, calc(100vw - 32px));
  }
}