:root {
  color-scheme: dark;
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #071d23;
  color: #f3fbf9;
  font-synthesis: none;
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
  margin: 0;
}

body {
  min-height: 100svh;
  background:
    radial-gradient(circle at 20% 8%, rgba(90, 226, 192, 0.19), transparent 32rem),
    radial-gradient(circle at 90% 90%, rgba(40, 154, 170, 0.17), transparent 28rem),
    linear-gradient(145deg, #09272e 0%, #06181e 58%, #071d23 100%);
}

body::before {
  position: fixed;
  inset: 0;
  pointer-events: none;
  content: "";
  opacity: 0.24;
  background-image: linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: 32px 32px;
  mask-image: linear-gradient(to bottom, black, transparent 70%);
}

.page-shell {
  position: relative;
  display: grid;
  min-height: 100svh;
  place-items: center;
  padding: max(24px, env(safe-area-inset-top)) max(18px, env(safe-area-inset-right))
    max(24px, env(safe-area-inset-bottom)) max(18px, env(safe-area-inset-left));
}

.launcher-card {
  width: min(100%, 440px);
  padding: 38px 26px 30px;
  overflow: hidden;
  text-align: center;
  background: linear-gradient(155deg, rgba(17, 57, 65, 0.94), rgba(7, 31, 37, 0.92));
  border: 1px solid rgba(181, 255, 236, 0.17);
  border-radius: 28px;
  box-shadow: 0 28px 80px rgba(0, 7, 10, 0.46), inset 0 1px rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(18px);
}

.sound-mark {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 62px;
  gap: 6px;
  margin-bottom: 22px;
}

.sound-mark span {
  display: block;
  width: 7px;
  height: 28px;
  border-radius: 99px;
  background: linear-gradient(to top, #43d6b3, #b9ffed);
  box-shadow: 0 0 20px rgba(67, 214, 179, 0.35);
}

.sound-mark span:nth-child(1),
.sound-mark span:nth-child(5) {
  height: 20px;
}

.sound-mark span:nth-child(2),
.sound-mark span:nth-child(4) {
  height: 42px;
}

.sound-mark span:nth-child(3) {
  height: 58px;
}

.eyebrow {
  margin: 0 0 10px;
  color: #72e3c7;
  font-size: 0.75rem;
  font-weight: 750;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 9vw, 3rem);
  line-height: 1.02;
  letter-spacing: -0.045em;
}

.intro {
  max-width: 32ch;
  margin: 18px auto 28px;
  color: #bdd4d1;
  font-size: 1rem;
  line-height: 1.55;
}

.launch-button {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: 68px;
  gap: 12px;
  padding: 18px 20px;
  color: #06221e;
  font-size: 1.05rem;
  font-weight: 780;
  line-height: 1.2;
  text-decoration: none;
  background: linear-gradient(135deg, #b7ffe8, #53dfbb 70%, #3bc7ae);
  border: 0;
  border-radius: 18px;
  box-shadow: 0 14px 34px rgba(51, 211, 174, 0.2), inset 0 1px rgba(255, 255, 255, 0.72);
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  transition: transform 150ms ease, box-shadow 150ms ease, filter 150ms ease;
}

.launch-button:active {
  transform: translateY(2px) scale(0.99);
  filter: brightness(0.95);
  box-shadow: 0 8px 18px rgba(51, 211, 174, 0.16);
}

.launch-button:focus-visible {
  outline: 3px solid #ffffff;
  outline-offset: 4px;
}

.arrow {
  font-size: 1.45rem;
  line-height: 1;
}

.hint {
  margin: 20px auto 0;
  color: #8ea9a7;
  font-size: 0.83rem;
  line-height: 1.45;
}

@media (max-width: 380px) {
  .launcher-card {
    padding: 30px 20px 24px;
    border-radius: 24px;
  }

  .intro {
    margin-bottom: 24px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .launch-button {
    transition: none;
  }
}