:root {
  --text-color: #ffffff;
  --btn-bg: #000000;
  --btn-bg-hover: #1e1e1e;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  width: 100%;
  height: 100%;
  font-family: "Inter", Arial, sans-serif;
  color: var(--text-color);
}

body {
  overflow: hidden;
  background: #111;
}

.landing-page {
  position: fixed;
  inset: 0;
  background-image: url("./assets/background.png");
  background-size: cover;
  background-position: center center;
  background-repeat: no-repeat;
}

.overlay {
  position: absolute;
  inset: 0;
  background: rgba(51, 51, 51, 0.6);
  z-index: 1;
}

.top-brand {
  position: absolute;
  z-index: 2;
  width: 100%;
  padding: 1.5rem;
  margin: auto;
}

.nus-logo {
  width: min(390px, 100%);
  height: auto;
  display: block;
}

.hero-content {
  position: relative;
  z-index: 2;
  width: 100%;
  height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  gap: 30px;
  padding: 20px;
}

.sdl-logo {
  max-width: 230px;
  height: auto;
}

.title {
  margin: 0;
  padding-bottom: 30px;
  font-size: 40px;
  line-height: 48px;
  font-weight: 500;
  border-bottom: 1px solid rgba(217, 217, 217, 1);
}

.start-btn {
  width: 250px;
  height: 56px;
  border: 0;
  border-radius: 10px;
  background: var(--btn-bg);
  color: #fff;
  font-size: 20px;
  cursor: pointer;
  transition: background-color 0.2s ease, transform 0.08s ease;
}

.start-btn:hover {
  background: var(--btn-bg-hover);
}

.start-btn:active {
  transform: scale(0.98);
}

.tour-view {
  position: fixed;
  inset: 0;
  background: #000;
}

.tour-view iframe {
  width: 100%;
  height: 100%;
  border: 0;
  display: block;
}

.hidden {
  display: none;
}

@media (max-width: 390px) {
  .sdl-logo {
    max-width: 180px;
  }

  .title {
    font-size: 24px;
    line-height: 32px;
  }
}