* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Segoe UI", Arial, sans-serif;
  color: white;
  background: #06162e;
}

.glass {
  background: rgba(255,255,255,.18);
  border: 1px solid rgba(255,255,255,.45);
  box-shadow:
    inset 0 1px rgba(255,255,255,.65),
    0 20px 60px rgba(0,0,0,.35);
  backdrop-filter: blur(22px);
}

.topbar {
  position: fixed;
  top: 18px;
  left: 50%;
  transform: translateX(-50%);
  width: min(1100px, 90%);
  height: 58px;
  z-index: 50;
  border-radius: 18px;
  padding: 0 24px;

  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  font-weight: 700;
  font-size: 20px;
}

.nav-links {
  display: flex;
  gap: 24px;
}

.nav-links a {
  color: white;
  text-decoration: none;
  opacity: .85;
  font-size: 14px;
}

.nav-links a:hover {
  opacity: 1;
}

.hero-home {
  min-height: 100vh;
  display: grid;
  place-items: center;
  text-align: center;
  position: relative;
  overflow: hidden;

  background:
    radial-gradient(circle at 50% 45%, rgba(95,200,255,.95), transparent 20%),
    radial-gradient(circle at 20% 80%, rgba(0,255,210,.35), transparent 28%),
    radial-gradient(circle at 85% 15%, rgba(120,120,255,.35), transparent 24%),
    linear-gradient(135deg, #020b18, #064b86 48%, #00a2c7);
}

.hero-home::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, transparent 25%, rgba(255,255,255,.18), transparent 45%);
  transform: translateX(-130%) skewX(-18deg);
  animation: pageShine 6s infinite;
}

@keyframes pageShine {
  0% { transform: translateX(-130%) skewX(-18deg); }
  55% { transform: translateX(130%) skewX(-18deg); }
  100% { transform: translateX(130%) skewX(-18deg); }
}

.hero-content {
  position: relative;
  z-index: 2;
}

.hero-line {
  width: min(720px, 80vw);
  height: 2px;
  margin: 22px auto;
  background: linear-gradient(90deg, transparent, white, transparent);
  opacity: .8;
}

.shine-logo {
  margin: 0;
  font-size: clamp(64px, 12vw, 155px);
  letter-spacing: -6px;
  line-height: .9;
  text-shadow: 0 15px 55px rgba(0,0,0,.55);

  background: linear-gradient(100deg, #fff, #bdefff, #fff);
  -webkit-background-clip: text;
  color: transparent;

  position: relative;
}

.hero-content p {
  font-size: 34px;
  margin: 30px 0;
  text-shadow: 0 6px 25px rgba(0,0,0,.45);
}

.discover-btn,
.final button {
  display: inline-block;
  border: 1px solid rgba(255,255,255,.75);
  border-radius: 999px;
  padding: 14px 38px;

  color: white;
  text-decoration: none;
  font-weight: 600;

  background: linear-gradient(#9ee5ff, #1676d2 55%, #0b4fa8);
  box-shadow:
    inset 0 1px rgba(255,255,255,.9),
    inset 0 -1px rgba(0,0,0,.25),
    0 14px 34px rgba(0,0,0,.38);

  cursor: pointer;
  transition: .25s;
}

.discover-btn:hover,
.final button:hover {
  transform: translateY(-2px);
  filter: brightness(1.15);
}

.particles::before,
.particles::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle, rgba(255,255,255,.8) 1px, transparent 1px),
    radial-gradient(circle, rgba(255,255,255,.35) 1px, transparent 1px);
  background-size: 90px 90px, 140px 140px;
  animation: particlesMove 18s linear infinite;
}

@keyframes particlesMove {
  from { transform: translateY(0); }
  to { transform: translateY(-120px); }
}

.section {
  padding: 110px 10%;
  text-align: center;
  background: linear-gradient(#06162e, #0a2e5c);
}

.section.blue {
  background: radial-gradient(circle at top, #1479c9, #06162e 70%);
}

.eyebrow {
  color: #9ee5ff;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.section h2 {
  font-size: clamp(38px, 6vw, 76px);
  line-height: 1.05;
  margin: 10px 0 50px;
}

.aero-window {
  max-width: 820px;
  margin: auto;
  border-radius: 14px;
  overflow: hidden;

  background: rgba(255,255,255,.22);
  border: 1px solid rgba(255,255,255,.6);
  box-shadow: 0 35px 90px rgba(0,0,0,.55);
  backdrop-filter: blur(24px);
}

.titlebar {
  height: 44px;
  padding: 8px 12px;

  display: flex;
  justify-content: space-between;
  align-items: center;

  background: linear-gradient(rgba(255,255,255,.55), rgba(255,255,255,.12));
}

.titlebar button {
  border: 1px solid rgba(255,255,255,.7);
  background: linear-gradient(#ffffff99, #ffffff33);
  border-radius: 4px;
  color: white;
}

.window-body {
  padding: 60px;
  color: #111;
  background: rgba(255,255,255,.86);
}

.window-body h3 {
  font-size: 36px;
  margin: 0 0 12px;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 24px;
}

.card {
  padding: 35px;
  border-radius: 20px;
  font-size: 20px;
  font-weight: 600;
}

.start-preview {
  max-width: 520px;
  height: 430px;
  margin: auto;
  padding: 18px;
  border-radius: 18px;

  display: grid;
  grid-template-columns: 1.4fr .9fr;
  gap: 14px;
}

.start-left,
.start-right {
  padding: 20px;
  border-radius: 12px;
  background: rgba(255,255,255,.75);
  color: #111;

  display: flex;
  flex-direction: column;
  gap: 16px;
  text-align: left;
}

.start-right {
  background: rgba(40,90,160,.45);
  color: white;
}

.nostalgia {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 18px;
}

.nostalgia span {
  padding: 14px 24px;
  border-radius: 999px;
  background: rgba(255,255,255,.15);
  border: 1px solid rgba(255,255,255,.35);
  backdrop-filter: blur(14px);
}

.final {
  background:
    radial-gradient(circle at 50% 0%, rgba(70,190,255,.6), transparent 30%),
    linear-gradient(#06162e, #020b18);
}

.final button {
  margin-top: 45px;
  font-size: 17px;
}