/* Full-viewport shell: prefer dvh (mobile chrome), fallback vh. */
:root {
  --app-h: 100vh;
  --app-h: 100dvh;
  --rail: clamp(4.5rem, 14vmin, 9.5rem);
  --gap: clamp(0.35rem, 1.2vmin, 0.75rem);
  --safe-t: env(safe-area-inset-top, 0px);
  --safe-b: env(safe-area-inset-bottom, 0px);
  --safe-l: env(safe-area-inset-left, 0px);
  --safe-r: env(safe-area-inset-right, 0px);
  --ui: clamp(0.7rem, 2.4vmin, 1rem);
}

html,
body {
  margin: 0;
  width: 100%;
  height: var(--app-h);
  overflow: hidden;
  background: #0a0f1a;
  overscroll-behavior: none;
  -webkit-tap-highlight-color: transparent;
}

/* —— PWA install gate (mobile browsers only; shown via JS class) —— */
.pwa-gate {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 100000;
  align-items: center;
  justify-content: center;
  padding: max(1rem, var(--safe-t)) max(1rem, var(--safe-r))
    max(1rem, var(--safe-b)) max(1rem, var(--safe-l));
  background: radial-gradient(ellipse at 50% 20%, #132038 0%, #070b14 70%);
  color: #e8ecf4;
  text-align: center;
  font-family: Tahoma, "Segoe UI", Vazirmatn, sans-serif;
}

body.pwa-required .pwa-gate {
  display: flex;
}

body.pwa-required .pwa-gated-content {
  visibility: hidden;
  pointer-events: none;
}

.pwa-gate__card {
  width: min(28rem, 92vw);
  padding: clamp(1.25rem, 4vmin, 2rem);
  border-radius: 1rem;
  background: rgba(14, 21, 36, 0.95);
  border: 1px solid rgba(212, 175, 55, 0.45);
  box-shadow: 0 1rem 2.5rem rgba(0, 0, 0, 0.45);
}

.pwa-gate__title {
  margin: 0 0 0.5rem;
  font-size: clamp(1.15rem, 4.2vmin, 1.55rem);
  color: #f5e6b8;
}

.pwa-gate__lead {
  margin: 0 0 1rem;
  font-size: var(--ui);
  line-height: 1.65;
  color: #c5d0e0;
}

.pwa-gate__steps {
  margin: 0 0 1.25rem;
  padding: 0 1.25rem 0 0;
  text-align: right;
  font-size: calc(var(--ui) * 0.95);
  line-height: 1.7;
  color: #9eb0c8;
}

.pwa-gate__install {
  appearance: none;
  border: 0;
  border-radius: 0.65rem;
  padding: 0.75rem 1.25rem;
  font-size: var(--ui);
  font-weight: 700;
  cursor: pointer;
  color: #1a1200;
  background: linear-gradient(180deg, #e0c35a, #c9a227);
  width: 100%;
}

.pwa-gate__resume {
  appearance: none;
  border: 0;
  border-radius: 0.65rem;
  padding: 0.75rem 1.25rem;
  font-size: var(--ui);
  font-weight: 700;
  cursor: pointer;
  color: #1a1200;
  background: linear-gradient(180deg, #7dff96, #2db84a);
  width: 100%;
}

.pwa-gate__install[hidden] {
  display: none !important;
}

.pwa-gate__resume[hidden],
.pwa-gate__steps[hidden] {
  display: none !important;
}

.pwa-gate__hint {
  margin: 0.85rem 0 0;
  font-size: calc(var(--ui) * 0.85);
  color: #7f93ad;
}

/* —— Force landscape on phones —— */
.landscape-gate {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 99990;
  align-items: center;
  justify-content: center;
  padding: 1.25rem;
  background: rgba(4, 8, 18, 0.94);
  color: #e8ecf4;
  text-align: center;
  font-family: Tahoma, "Segoe UI", Vazirmatn, sans-serif;
}

body.need-landscape .landscape-gate {
  display: flex;
}

body.need-landscape .pwa-gated-content {
  visibility: hidden;
  pointer-events: none;
}

.landscape-gate__card {
  max-width: 22rem;
}

.landscape-gate__icon {
  font-size: clamp(2.5rem, 12vmin, 4rem);
  margin-bottom: 0.75rem;
  display: block;
  animation: landscape-tilt 1.6s ease-in-out infinite;
}

@keyframes landscape-tilt {
  0%,
  100% {
    transform: rotate(0deg);
  }
  40% {
    transform: rotate(90deg);
  }
  60% {
    transform: rotate(90deg);
  }
}

.landscape-gate__title {
  margin: 0 0 0.4rem;
  font-size: clamp(1.05rem, 3.8vmin, 1.35rem);
}

.landscape-gate__lead {
  margin: 0;
  font-size: var(--ui);
  color: #9eb0c8;
  line-height: 1.6;
}