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

html,
body {
    width: 100%;
    height: 100%;
}
body {
    min-height: 100vh;
    overflow: hidden;
    
    background: #242424
        radial-gradient(
            circle at center,
            #242424 0%,
            #181818 50%,
            #0b0b0b 100%
        );

    font-family: Arial, sans-serif;
    color: white;
}

/* Three.js */
#canvas-container {
    position: fixed;
    inset: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}


/* 上层文字 */
.overlay {
    position: absolute;
    left: 50%;
    bottom: clamp(36px, 5vh, 56px);
    transform: translateX(-50%);
    text-align: center;
    z-index: 10;
    pointer-events: auto;
}

.overlay h1 {
  margin: 0 0 10px;
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.18em;
  color: rgba(255, 255, 255, 0.5);
}

.overlay h2 {
  margin: 0 0 26px;
  font-size: 23px;
  font-weight: 500;
  letter-spacing: 0.18em;
  color: rgba(255, 255, 255, 1);
}





/* ENTER */
.enter-link {
  position: relative;

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

  width: 130px;
  height: 32px;
  margin: 0 auto;

  color: rgba(255, 255, 255, 0.5);

  font-size: 0.7rem;
  line-height: 1;
  text-decoration: none;

  cursor: pointer;
}

.enter-text {
  position: relative;
  z-index: 1;

  letter-spacing: 0.18em;

  transition:
    color 0.4s ease,
    letter-spacing 0.45s cubic-bezier(0.22, 1, 0.36, 1),
    text-shadow 0.4s ease;
}

/* 四个直角的共同样式 */
.enter-corner {
  position: absolute;

  width: 5px;
  height: 5px;

  border-color: rgba(255, 255, 255, 0.36);
  border-style: solid;
  border-width: 0;

  transition:
    width 0.45s cubic-bezier(0.22, 1, 0.36, 1),
    height 0.45s cubic-bezier(0.22, 1, 0.36, 1),
    inset 0.45s cubic-bezier(0.22, 1, 0.36, 1),
    border-color 0.35s ease,
    filter 0.35s ease;
}

/* 左上角 */
.corner-top-left {
  top: 0;
  left: 0;

  border-top-width: 1px;
  border-left-width: 1px;
}

/* 右上角 */
.corner-top-right {
  top: 0;
  right: 0;

  border-top-width: 1px;
  border-right-width: 1px;
}

/* 左下角 */
.corner-bottom-left {
  bottom: 0;
  left: 0;

  border-bottom-width: 1px;
  border-left-width: 1px;
}

/* 右下角 */
.corner-bottom-right {
  right: 0;
  bottom: 0;

  border-right-width: 1px;
  border-bottom-width: 1px;
}

/* 鼠标移入和键盘聚焦 */
.enter-link:hover .enter-text,
.enter-link:focus-visible .enter-text {
  color: #fff;
  letter-spacing: 0.25em;

  text-shadow:
    0 0 12px rgba(210, 240, 255, 0.28);
}

.enter-link:hover .enter-corner,
.enter-link:focus-visible .enter-corner {
  width: 6px;
  height: 6px;

  border-color: rgba(230, 246, 255, 0.95);

  filter:
    drop-shadow(0 0 4px rgba(190, 230, 255, 0.35));
}

/* 四角向内移动 */
.enter-link:hover .corner-top-left,
.enter-link:focus-visible .corner-top-left {
  top: 4px;
  left: 4px;
}

.enter-link:hover .corner-top-right,
.enter-link:focus-visible .corner-top-right {
  top: 4px;
  right: 4px;
}

.enter-link:hover .corner-bottom-left,
.enter-link:focus-visible .corner-bottom-left {
  bottom: 4px;
  left: 4px;
}

.enter-link:hover .corner-bottom-right,
.enter-link:focus-visible .corner-bottom-right {
  right: 4px;
  bottom: 4px;
}

/* 键盘操作时的焦点提示 */
.enter-link:focus-visible {
  outline: 1px solid rgba(220, 240, 255, 0.5);
  outline-offset: 5px;
}








/* 轻微暗角 */
body::before {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;

    background:
        radial-gradient(
            circle at center,
            rgba(0,255,255,0.06) 0%,
            rgba(0,255,255,0.02) 25%,
            transparent 50%
        );

    z-index: 1;
}


::view-transition-old(root),
::view-transition-new(root) {
  animation-duration: 0.45s;
  animation-timing-function: cubic-bezier(.2, .8, .2, 1);
}



@media (prefers-reduced-motion: reduce) {
  .enter-text,
  .enter-corner {
    transition: none;
  }
}