html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: black;
  overflow: hidden;
}

.hero-section {
  width: 100dvw;
  height: 100dvh;
  background-color: black;
  background-image:
    repeating-linear-gradient(
      rgba(0, 255, 100, 0.03) 0px,
      rgba(0, 255, 100, 0.03) 1px,
      transparent 1px,
      transparent 2px
    ),
    radial-gradient(circle at center, rgba(0,255,100,0.03) 0%, transparent 80%);
  background-size: cover;
  background-repeat: repeat;
  background-position: center;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  align-items: center;
  box-sizing: border-box;
  position: relative;
  font-family: 'VT323', monospace;
  padding-top: 7dvh;
  padding-bottom: 7dvh;
  padding-left: 5dvw;
  padding-right: 5dvw;
  overflow-y: auto;
}

.hero-title {
  color: #00FF99;
  font-size: clamp(3rem, 6dvw, 8rem);
  letter-spacing: 1dvw;
  margin: 0 0 0.1dvh 0;
  text-shadow: 0 2dvh 8dvw #000;
  text-align: center;
  max-width: 100%;
  word-break: break-word;
}

.hero-slogan {
  color: #6AFFE3;
  font-size: clamp(1rem, 2.5dvw, 3rem);
  letter-spacing: 0.1dvw;
  margin: 0;
  text-align: center;
  max-width: 100%;
  word-break: break-word;
  min-height: 2.5em;
  display: inline-block;
}

.button-container {
  display: flex;
  flex-direction: column;
  gap: 2.5dvh;
  margin-top: 6dvh;
}

.link-button {
  position: relative;
  overflow: hidden;
  background: transparent;
  color: #00FF99;
  font-family: 'VT323', monospace;
  font-size: clamp(1.1rem, 2.8vw, 2rem);
  border: 2px solid #00FF99;
  border-radius: 1.5dvw;
  padding: 2dvh 0;
  margin: 0;
  width: 100%;
  text-align: center;
  text-decoration: none;
  user-select: none;
  letter-spacing: 0.06em;
  text-shadow: 0 0 4px #00FF99;
  box-shadow: 0 0 8px #00FF99, 0 0 20px #00FF9930;
  transition: transform 0.2s, box-shadow 0.2s;
  display: inline-block;
}

.link-button .btn-text {
  position: relative;
  z-index: 2;
}

.link-button .cursor {
  position: relative;
  z-index: 2;
}

.link-button::before {
  content: "";
  position: absolute;
  top: 0;
  right: 100%;
  width: 100%;
  height: 100%;
  background: rgba(0, 255, 100, 0.15);
  box-shadow: 0 0 20px #00FF99;
  z-index: 1;
  transform: skewX(-20deg);
  transition: right 0.4s ease;
}

.link-button.hover::before {
  right: 0%;
}

.footer {
  max-width: 100dvw;
  padding: 3dvh 2dvw 2dvh;
  color: #00ff99;
  font-family: 'VT323', monospace;
  font-size: clamp(1rem, 1.4dvw, 2rem);
  text-align: center;
  border-top: 1px solid rgba(0,255,153,0.2);
  margin-top: 5dvh;
  opacity: 0.8;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.4ch;
  user-select: none;
}

.footer-cursor {
  display: inline-block;
  width: 1ch;
  animation: blink-cursor 0.8s steps(1) infinite;
}

.menu-btn {
  padding: 3dvh 5dvw;
  border-bottom-left-radius: 3dvw;
  border-bottom-right-radius: 3dvw;
  background-color: transparent;
  color:#00FF99;
  box-shadow: 0 0 8px #00FF99, 0 0 20px #00FF9930;
}

.menu-switcher {
  display: flex;
  justify-content: center;
  gap: 3dvw;
  margin-bottom: 2dvh;
}

.room-container {
  display: flex;
  flex-direction: column;
  gap: 2dvh;
  align-items: center;
  width: 100%;
  max-width: 35dvw;
  margin: 0 auto;
}

.comment-list {
  display: flex;
  flex-direction: column;
  gap: 1.2dvh;
  width: 100%;
  padding: 1.5dvh 1dvw;
  background: transparent;
  font-family: 'VT323', monospace;
  color: #00ff99;
  min-height: 50dvh;
  max-height: 80dvh;
  overflow-y: auto;
  border-radius: 1.5dvw;
}

.comment-item {
  background: transparent;
  padding: 1dvh 1.2dvw;
  border-radius: 1dvw;
  border: 1px solid rgba(0,255,153,0.2);
  box-shadow: 0 0 8px #00ff9925;
  position: relative;
}

.comment-name {
  display: block;
  font-weight: bold;
  color: #6AFFE3;
  margin-bottom: 0.4dvh;
}

.comment-form {
  display: flex;
  justify-content: center;
  width: 100%;
}

.comment-form-bubble {
  display: flex;
  align-items: center;
  gap: 1dvw;
  padding: 1dvh 1dvw;
  background: #111;
  border: 1px solid #00ff99;
  border-radius: 1dvw;
  width: 100%;
  box-shadow: 0 0 10px #00ff9940;
}

.comment-form-bubble input,
.comment-form-bubble textarea {
  flex: 1;
  font-family: 'VT323', monospace;
  background: transparent;
  border: none;
  color: #00ff99;
  outline: none;
  resize: none;
  font-size: 1rem;
  padding: 0.5dvh;
}

.comment-form-bubble input::placeholder,
.comment-form-bubble textarea::placeholder {
  color: #666;
}

.comment-form-bubble textarea {
  height: 3.5rem;
}

.comment-form-bubble button {
  font-family: monospace;
  background: #002b11;
  color: #00ff99;
  border: 1px solid #00ff99;
  border-radius: 50%;
  width: 2.6rem;
  height: 2.6rem;
  font-size: 1.3rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.comment-form-bubble button:hover {
  background: #00ff99;
  color: #000;
}

@media (max-width: 768px) {
  html, body {
    font-size: 14px;
  }

  .hero-section {
    padding-top: 5dvh;
    padding-bottom: 5dvh;
    padding-left: 3dvw;
    padding-right: 3dvw;
  }

  .hero-title {
    font-size: clamp(2.5rem, 8vw, 5rem);
  }

  .hero-slogan {
    font-size: clamp(1rem, 4.5vw, 2rem);
    min-height: 2em;
  }

  .button-container {
    margin-top: 4dvh;
  }

  .link-button {
    font-size: clamp(1rem, 3.8vw, 1.4rem);
    padding: 1.5dvh 0;
  }

  .footer {
    font-size: 1rem;
    padding: 2dvh 1dvw 1.5dvh;
  }

  .menu-btn {
    padding: 1.2dvh 4dvw;
    border-bottom-left-radius: 4dvw;
    border-bottom-right-radius: 4dvw;
    font-size: 1.2rem;
  }

  .menu-switcher {
    gap: 2dvw;
  }

  .room-container {
    max-width: 90dvw;
    padding: 0 2dvw;
  }

  .comment-list {
    min-height: 35dvh;
    max-height: 55dvh;
    padding: 1.5dvh 2dvw;
    font-size: 1rem;
  }

  .comment-item {
    font-size: 1rem;
    padding: 1dvh;
  }

  .comment-form-bubble {
    gap: 1dvw;
    padding: 1.2dvh 2dvw;
  }

  .comment-form-bubble textarea {
    height: 3.2rem;
  }

  .comment-form-bubble button {
    width: 2.2rem;
    height: 2.2rem;
    font-size: 1.1rem;
  }
}

.icon-svg {
  vertical-align: middle;
  margin-right: 0.64em;
  filter: drop-shadow(0 0 4px #00FF99) brightness(1.2);
  transition: filter 0.23s;
}
.link-button:hover .icon-svg,
.link-button:focus .icon-svg {
  filter: drop-shadow(0 0 9px #00FF99) brightness(1.4);
}