* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
html {
  height: 100%;
}
body.landing-page {
  min-height: 100%;
  min-height: 100dvh;
  overflow-x: hidden;
  overflow-y: auto;
  -webkit-text-size-adjust: 100%;
}
.dark-mode {
  background-color: #0b1220;
  color: #e7edf8;
}
/* Mavzu tugmasi: o'ng yuqori burchak, bosish uchun qulay maydon */
#mode-icon {
  position: fixed;
  top: max(6px, env(safe-area-inset-top));
  right: max(12px, env(safe-area-inset-right));
  z-index: 5;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  font-size: 1.5rem;
  cursor: pointer;
  border-radius: 50%;
  transition: background-color 0.2s;
}
#mode-icon:hover {
  background-color: rgba(127, 127, 150, 0.18);
}
#mode-icon:focus-visible {
  outline: 2px solid #1877f2;
  outline-offset: 2px;
}

/* Sahifa ekran balandligiga moslashadi; sig'masa tabiiy ravishda scroll bo'ladi (hech narsa kesilmaydi) */
.landing {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: calc(56px + env(safe-area-inset-top))
    max(16px, env(safe-area-inset-right)) 0 max(16px, env(safe-area-inset-left));
}
.landing-body {
  flex: 1;
  width: 100%;
  max-width: 560px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: clamp(8px, 2vh, 16px);
  padding-block: clamp(8px, 3vh, 32px);
  text-align: center;
}
.main-body {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}
.logo {
  height: clamp(110px, 30vh, 250px);
  width: auto;
  max-width: 62vw;
  aspect-ratio: 1;
  object-fit: contain;
}
.landing h1 {
  margin: 0;
  font-size: clamp(1.9rem, 1.2rem + 2.2vw, 2.6rem);
  font-weight: 700;
}
.tagline {
  max-width: 40ch;
  margin: 0;
  font-size: clamp(1rem, 0.9rem + 0.5vw, 1.25rem);
  line-height: 1.45;
  text-wrap: balance;
}
.start-message__btn {
  display: inline-block;
  width: min(100%, 320px);
  margin-top: clamp(8px, 2vh, 20px);
  padding: 12px 20px;
  border: none;
  border-radius: 20px;
  background: linear-gradient(135deg, #3189ff, #1877f2);
  box-shadow: 0 10px 24px -10px rgba(24, 119, 242, 0.8);
  color: #fff;
  font-size: clamp(1.15rem, 1rem + 0.6vw, 1.5rem);
  text-align: center;
  text-decoration: none;
  transition:
    transform 0.15s ease,
    box-shadow 0.2s ease;
}
.start-message__btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 28px -10px rgba(24, 119, 242, 0.9);
  color: #fff;
}
.start-message__btn:active {
  transform: scale(0.97);
}
footer {
  width: 100%;
  padding: 14px 0 calc(14px + env(safe-area-inset-bottom));
}
footer p {
  margin: 0;
  font-size: 0.85rem;
  text-align: center;
}
/* Past ekranlar (kichik noutbuk oynasi, telefon yotiq holatda) */
@media (max-height: 560px) {
  .landing {
    padding-top: calc(48px + env(safe-area-inset-top));
  }
  .logo {
    height: clamp(84px, 24vh, 130px);
  }
  .landing-body {
    gap: 6px;
    padding-block: 6px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .start-message__btn,
  #mode-icon {
    transition: none;
  }
}