:root {
  --primary-color: #ffffff;
  --bg-color: #1a1a1a;
  --card-bg: rgba(255, 255, 255, 0.1);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: var(--bg-color);
  color: var(--primary-color);
  min-height: 100vh;
  line-height: 1.5;
  font-size: clamp(14px, 1vw, 16px);
  overflow-x: hidden;
}


@font-face {
  font-family: "HarmonyOS_M";
  src: url("/font/web_font.woff2") format("woff2");
  font-display: swap;
}

:root {
  --primary-color: #ffffff;
  --bg-color: #1a1a1a;
  --card-bg: rgba(255, 255, 255, 0.1);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: "HarmonyOS_M", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: var(--bg-color);
  color: var(--primary-color);
  min-height: 100vh;
  line-height: 1.5;
  font-size: clamp(14px, 1vw, 16px);
  overflow-x: hidden;
}

h1, h2, h3, p, span, a, div {
  font-family: "HarmonyOS_M", sans-serif;
}

.background {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  display: flex;
  gap: 1rem;
  transform: rotate(-15deg) scale(1.5);
  pointer-events: none;
  z-index: 0;
}

.waterfall-column {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  position: relative;
  overflow: hidden;
}

.column-wrapper {
  position: absolute;
  left: 0;
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  will-change: transform;
}

.waterfall-column:nth-child(2) {
  animation-delay: -20s;
}

.waterfall-column:nth-child(3) {
  animation-delay: -40s;
}

.waterfall-column img {
  width: 100%;
  height: auto;
  border-radius: 0.5rem;
  opacity: 0.1;
  transition: opacity 0.3s ease;
}

.container {
  max-width: 75rem;
  margin: 0 auto;
  padding: 1.25rem;
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem 0;
  width: 100%;
  max-width: 56.25rem;
}

.logo img {
  height: 1.5rem;
}

.mobile-toggle {
  display: none;
}

.greeting {
  margin: 3.125rem 0;
  text-align: left;
  width: 100%;
  max-width: 56.25rem;
}

.wave-icon {
  font-size: clamp(2rem, 4vw, 2.25rem);
  margin-bottom: 1rem;
}

h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  margin-bottom: 0.5rem;
  font-weight: 500;
}

h2 {
  font-size: clamp(2rem, 5vw, 3rem);
  margin-bottom: 1rem;
  font-weight: 500;
}

.subtitle {
  font-size: clamp(1.125rem, 2.5vw, 1.5rem);
  opacity: 0.8;
  font-weight: 400;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(17.5rem, 1fr));
  gap: 0.75rem;
  position: relative;
  z-index: 1;
  max-width: 56.25rem;
  width: 100%;
}

.card {
  -webkit-tap-highlight-color: transparent;
  user-select: none;
  background: var(--card-bg);
  border-radius: 1rem;
  padding: 1rem 1.25rem;
  backdrop-filter: blur(10px);
  transition: transform 0.3s ease;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  text-decoration: none;
  color: inherit;
  height: 100%;
  min-height: 4rem;
}

.card:hover {
  transform: translateY(-0.3125rem);
}

.card-main {
  flex-grow: 1;
}

.card-icon {
  width: 2rem;
  height: 2rem;
  display: flex;
  align-items: center;
  margin-bottom: 0.5rem;
}

.card h3 {
  font-size: clamp(1.125rem, 2vw, 1.25rem);
  margin-bottom: 0.375rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.card h3 img {
  width: 1.5rem;
  height: 1.5rem;
}

.card p {
  opacity: 0.8;
  font-size: clamp(0.875rem, 1.5vw, 1rem);
  color: rgba(255, 255, 255, 0.8);
  line-height: 1.6;
  margin-bottom: 1rem;
}

.card-footer {
  margin-top: auto;
}

.try-button {
  color: var(--primary-color);
  font-size: clamp(0.875rem, 1.5vw, 1rem);
  display: flex;
  align-items: center;
  font-weight: 500;
}

.arrow {
  margin-left: 0.5rem;
  transition: transform 0.3s ease;
}

.card:hover .arrow {
  transform: translateX(0.3125rem);
}

.sphere-bg {
  position: fixed;
  bottom: -30%;
  right: -10%;
  width: 50rem;
  height: 50rem;
  background: linear-gradient(45deg, #1a1a1a, #2a2a2a);
  border-radius: 50%;
  opacity: 0.5;
  z-index: 0;
}

@media (max-width: 48rem) {
  .container {
    padding: 1rem;
  }

  header {
    max-width: 100%;
  }

  .greeting {
    margin: 2.5rem 0;
    max-width: 100%;
  }

  .cards {
    grid-template-columns: 1fr;
    max-width: 100%;
  }

  .card {
    padding: 1rem;
  }

  .mobile-toggle {
    display: block;
  }

  .sphere-bg {
    width: 25rem;
    height: 25rem;
    bottom: -20%;
    right: -20%;
  }

  .card:active {
    transform: scale(0.98);
    transition: transform 0.2s ease;
  }

  .card:hover {
    transform: none;
  }

  .card:hover .arrow {
    transform: none;
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(1.25rem);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.greeting, .card {
  animation: fadeInUp 0.8s ease forwards;
}



@media (prefers-reduced-motion: reduce) {
  .greeting, .card {
    animation: none;
  }

  .card:hover .arrow {
    transform: none;
  }

  .card:hover {
    transform: none;
  }

  .waterfall-column {
    animation: none;
  }
}