:root {
  color-scheme: dark;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background:
    radial-gradient(circle at 0% 0%, #3b2a7a 0, transparent 55%),
    radial-gradient(circle at 100% 100%, #161a34 0, #050716 60%);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text",
    "Segoe UI", sans-serif;
  color: #ffffff;
}

/* 居中容器 */
.hero {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 80px;
  padding: 40px 16px;
}

/* 顶部大标题：左侧多语言 + 右侧渐变文字 */
.hero-title {
  font-size: clamp(2.4rem, 4vw, 3.5rem);
  line-height: 1.3;
  font-weight: 700;
  letter-spacing: 0.03em;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  flex-wrap: wrap;
}

/* 右侧渐变标题 */
.hero-title-main {
  background: linear-gradient(
    120deg,
    #ff9a9e,
    #fad0c4,
    #fbc2eb,
    #a18cd1,
    #84fab0
  );
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: 0 10px 35px rgba(0, 0, 0, 0.6);
}

/* ------------ 多语言竖向滑动 ------------ */

.hello-slider {
  display: inline-flex;
  align-items: center;
  height: 1.2em;
}

.hello-words {
  --bg-color: #050716;
  overflow: hidden;
  position: relative;
  height: 1.2em;
  line-height: 1.2;
}

.hello-word {
  display: block;
  height: 100%;
  padding-left: 4px;
  color: #ffc9ad;
  text-shadow: 0 10px 30px rgba(0, 0, 0, 0.6);
  animation: hello_spin 4s infinite;
}

/* 5 个单词，对应 0% ~ -400% 的位移 */
@keyframes hello_spin {
  10% {
    transform: translateY(-102%);
  }

  25% {
    transform: translateY(-100%);
  }

  35% {
    transform: translateY(-202%);
  }

  50% {
    transform: translateY(-200%);
  }

  60% {
    transform: translateY(-302%);
  }

  75% {
    transform: translateY(-300%);
  }

  85% {
    transform: translateY(-402%);
  }

  100% {
    transform: translateY(-400%);
  }
}

/* ------------ 按钮 ------------ */

.button {
  display: inline-block;
  --white: #ffe7ff;
  --purple-100: #f4b1fd;
  --purple-200: #d190ff;
  --purple-300: #c389f2;
  --purple-400: #8e26e2;
  --purple-500: #5e2b83;
  --radius: 18px;

  border-radius: var(--radius);
  outline: none;
  cursor: pointer;
  font-size: 20px;
  font-family: inherit;
  background: transparent;
  letter-spacing: -0.5px;
  border: 0;
  position: relative;
  width: 220px;
  height: 80px;
  transform: rotate(353deg) skewX(4deg);
  margin-top: 17px;
}

.bg {
  position: absolute;
  inset: 0;
  border-radius: inherit;
  filter: blur(1px);
}

.bg::before,
.bg::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: calc(var(--radius) * 1.1);
  background: var(--purple-500);
}

.bg::before {
  filter: blur(5px);
  transition: all 0.3s ease;
  box-shadow:
    -7px 6px 0 0 rgb(115 75 155 / 40%),
    -14px 12px 0 0 rgb(115 75 155 / 30%),
    -21px 18px 4px 0 rgb(115 75 155 / 25%),
    -28px 24px 8px 0 rgb(115 75 155 / 15%),
    -35px 30px 12px 0 rgb(115 75 155 / 12%),
    -42px 36px 16px 0 rgb(115 75 155 / 8%),
    -56px 42px 20px 0 rgb(115 75 155 / 5%);
}

.wrap {
  border-radius: inherit;
  overflow: hidden;
  height: 100%;
  transform: translate(6px, -6px);
  padding: 3px;
  background: linear-gradient(
    to bottom,
    var(--purple-100) 0%,
    var(--purple-400) 100%
  );
  position: relative;
  transition: all 0.3s ease;
}

.outline {
  position: absolute;
  overflow: hidden;
  inset: 0;
  opacity: 0;
  outline: none;
  border-radius: inherit;
  transition: all 0.4s ease;
}

.outline::before {
  content: "";
  position: absolute;
  inset: 2px;
  width: 120px;
  height: 300px;
  margin: auto;
  background: linear-gradient(
    to right,
    transparent 0%,
    white 50%,
    transparent 100%
  );
  animation: spin 3s linear infinite;
  animation-play-state: paused;
}

.content {
  pointer-events: none;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1;
  position: relative;
  height: 100%;
  gap: 16px;
  border-radius: calc(var(--radius) * 0.85);
  font-weight: 600;
  transition: all 0.3s ease;
  background: linear-gradient(
    to bottom,
    var(--purple-300) 0%,
    var(--purple-400) 100%
  );
  box-shadow:
    inset -2px 12px 11px -5px var(--purple-200),
    inset 1px -3px 11px 0px rgb(0 0 0 / 35%);
}

.content::before {
  content: "";
  inset: 0;
  position: absolute;
  z-index: 10;
  width: 80%;
  top: 45%;
  bottom: 35%;
  opacity: 0.7;
  margin: auto;
  background: linear-gradient(to bottom, transparent, var(--purple-400));
  filter: brightness(1.3) blur(5px);
}

.char {
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.char span {
  display: block;
  color: transparent;
  position: relative;
}

.char span::before,
.char span::after {
  content: attr(data-label);
  position: absolute;
  color: var(--white);
  text-shadow: -1px 1px 2px var(--purple-500);
  left: 0;
}

.char span::before {
  opacity: 0;
  transform: translateY(-100%);
}

.char.state-2 {
  position: absolute;
  left: 80px;
}

.char.state-2 span::after {
  opacity: 1;
}

.icon {
  animation: resetArrow 0.8s cubic-bezier(0.7, -0.5, 0.3, 1.2) forwards;
  z-index: 10;
}

.icon div,
.icon div::before,
.icon div::after {
  height: 3px;
  border-radius: 1px;
  background-color: var(--white);
}

.icon div::before,
.icon div::after {
  content: "";
  position: absolute;
  right: 0;
  transform-origin: center right;
  width: 14px;
  border-radius: 15px;
  transition: all 0.3s ease;
}

.icon div {
  position: relative;
  width: 24px;
  box-shadow: -2px 2px 5px var(--purple-400);
  transform: scale(0.9);
  background: linear-gradient(to bottom, var(--white), var(--purple-100));
  animation: swingArrow 1s ease-in-out infinite;
  animation-play-state: paused;
}

.icon div::before {
  transform: rotate(44deg);
  top: 1px;
  box-shadow: 1px -2px 3px -1px var(--purple-400);
  animation: rotateArrowLine 1s linear infinite;
  animation-play-state: paused;
}

.icon div::after {
  bottom: 1px;
  transform: rotate(316deg);
  box-shadow: -2px 2px 3px 0 var(--purple-400);
  background: linear-gradient(200deg, var(--white), var(--purple-100));
  animation: rotateArrowLine2 1s linear infinite;
  animation-play-state: paused;
}

.path {
  position: absolute;
  z-index: 12;
  bottom: 0;
  left: 0;
  right: 0;
  stroke-dasharray: 150 480;
  stroke-dashoffset: 150;
  pointer-events: none;
}

.splash {
  position: absolute;
  top: 0;
  left: 0;
  pointer-events: none;
  stroke-dasharray: 60 60;
  stroke-dashoffset: 60;
  transform: translate(-17%, -31%);
  stroke: var(--purple-300);
}

/* 悬停 / 点击状态 */

.button:hover .wrap {
  transform: translate(8px, -8px);
}

.button:hover .outline {
  opacity: 1;
}

.button:hover .outline::before,
.button:hover .icon div::before,
.button:hover .icon div::after,
.button:hover .icon div {
  animation-play-state: running;
}

.button:hover .char.state-1 span::before {
  animation: charAppear 0.7s ease calc(var(--i) * 0.03s);
}

.button:hover .char.state-1 span::after {
  opacity: 1;
  animation: charDisappear 0.7s ease calc(var(--i) * 0.03s);
}

.button:active .bg::before {
  filter: blur(5px);
  opacity: 0.7;
  box-shadow:
    -7px 6px 0 0 rgb(115 75 155 / 40%),
    -14px 12px 0 0 rgb(115 75 155 / 25%),
    -21px 18px 4px 0 rgb(115 75 155 / 15%);
}

.button:active .content {
  box-shadow:
    inset -1px 12px 8px -5px rgba(71, 0, 137, 0.4),
    inset 0px -3px 8px 0px var(--purple-200);
}

.button:active .outline {
  opacity: 0;
}

.button:active .wrap {
  transform: translate(3px, -3px);
}

.button:active .splash {
  animation: splash 0.8s cubic-bezier(0.3, 0, 0, 1) forwards 0.05s;
}

.button:focus .path {
  animation: path 1.6s ease forwards 0.2s;
}

.button:focus .icon {
  animation: arrow 1s cubic-bezier(0.7, -0.5, 0.3, 1.5) forwards;
}

.char.state-2 span::after,
.button:focus .char.state-1 span {
  animation: charDisappear 0.5s ease forwards calc(var(--i) * 0.03s);
}

.button:focus .char.state-2 span::after {
  animation: charAppear 1s ease backwards calc(var(--i) * 0.03s);
}

/* 动画 keyframes */

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

@keyframes charAppear {
  0% {
    transform: translateY(50%);
    opacity: 0;
    filter: blur(20px);
  }
  20% {
    transform: translateY(70%);
    opacity: 1;
  }
  50% {
    transform: translateY(-15%);
    opacity: 1;
    filter: blur(0);
  }
  100% {
    transform: translateY(0);
    opacity: 1;
  }
}

@keyframes charDisappear {
  0% {
    transform: translateY(0);
    opacity: 1;
  }
  100% {
    transform: translateY(-70%);
    opacity: 0;
    filter: blur(3px);
  }
}

@keyframes arrow {
  0% {
    opacity: 1;
  }
  50% {
    transform: translateX(60px);
    opacity: 0;
  }
  51% {
    transform: translateX(-200px);
    opacity: 0;
  }
  100% {
    transform: translateX(-128px);
    opacity: 1;
  }
}

@keyframes swingArrow {
  50% {
    transform: translateX(5px) scale(0.9);
  }
}

@keyframes rotateArrowLine {
  50% {
    transform: rotate(30deg);
  }
  80% {
    transform: rotate(55deg);
  }
}

@keyframes rotateArrowLine2 {
  50% {
    transform: rotate(330deg);
  }
  80% {
    transform: rotate(300deg);
  }
}

@keyframes resetArrow {
  0% {
    transform: translateX(-128px);
  }
  100% {
    transform: translateX(0);
  }
}

@keyframes path {
  from {
    stroke: white;
  }
  to {
    stroke-dashoffset: -480;
    stroke: #f9c6fe;
  }
}

@keyframes splash {
  to {
    stroke-dasharray: 2 60;
    stroke-dashoffset: -60;
  }
}

/* ------------ 页面过渡：白色圆形覆盖层 ------------ */

.page-transition-overlay {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 999;
  overflow: hidden;
}

.page-transition-circle {
  position: absolute;
  width: 200px;
  height: 200px;
  background: #ffffff;
  border-radius: 50%;
  top: var(--circle-y, 50%);
  left: var(--circle-x, 50%);
  transform: translate(-50%, -50%) scale(0);
  transform-origin: center center;
  /* 先快后慢 */
  transition: transform 0.9s cubic-bezier(0.2, 0.8, 0.2, 1);
}