/* 文件路径：my-website/assets/css/home.css */
/* 首页开场动画样式 —— Logo 已放大 5 倍 */

html, body {
  overflow: hidden;
}

/* ========== 开场动画遮罩层 ========== */
#intro-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: #000;
  pointer-events: none;
  overflow: hidden;
}

/* ----- 蓝色渐变圆环 ----- */
.blue-circle {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: radial-gradient(circle at center,
    rgba(80, 170, 255, 1) 0%,
    rgba(40, 130, 255, 0.95) 30%,
    rgba(20, 90, 220, 0.9) 55%,
    rgba(10, 60, 180, 0.85) 75%,
    rgba(5, 40, 140, 0.8) 100%);
  transform: translate(-50%, -50%) scale(0);
  opacity: 0;
  z-index: 1;
  box-shadow: 0 0 60px 20px rgba(30, 120, 255, 0.6),
              0 0 120px 40px rgba(30, 120, 255, 0.3);
  transition: transform 1.4s cubic-bezier(0.22, 0.61, 0.36, 1),
              opacity 0.6s ease;
  will-change: transform, opacity;
}

.blue-circle.expand {
  transform: translate(-50%, -50%) scale(120);
  opacity: 1;
}

.blue-circle.fade-out {
  opacity: 0;
  transition: opacity 0.9s ease;
}

/* ----- Logo 区域（包裹图片的容器） ----- */
.logo-wrapper {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 10;
  transition: transform 1s cubic-bezier(0.22, 0.61, 0.36, 1);
  will-change: transform;
  pointer-events: auto;
  cursor: default;
}

.logo-wrapper.slide-up {
  transform: translate(-50%, -60%);
}

.logo-wrapper.detached {
  position: fixed;
  z-index: 10001;
}

/* ----- Logo 图片容器（负责光效和裁切） ----- */
.logo-text {
  position: relative;
  display: inline-block;
  line-height: 0;
  overflow: hidden;
  isolation: isolate;
}

/* ----- Logo 图片本身（放大 5 倍：6rem × 5 = 30rem） ----- */
.logo-img {
  display: block;
  height: 30rem;              /* 原 6rem，放大 5 倍 */
  width: auto;
  max-width: 90vw;            /* 防止超出屏幕宽度 */
  filter: brightness(0) invert(1);
  transition: filter 0.6s ease;
  user-select: none;
  -webkit-user-drag: none;
}

.logo-text.black .logo-img {
  filter: brightness(0);
}

/* ===== Logo 光划过效果 ===== */
.logo-text::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -100%;
  width: 50%;
  height: 200%;
  background: linear-gradient(
    100deg,
    rgba(255, 255, 255, 0) 0%,
    rgba(255, 255, 255, 0.35) 40%,
    rgba(255, 255, 255, 0.9) 50%,
    rgba(255, 255, 255, 0.35) 60%,
    rgba(255, 255, 255, 0) 100%
  );
  transform: skewX(-25deg);
  opacity: 0;
  pointer-events: none;
  z-index: 10;
  mix-blend-mode: overlay;
  will-change: left, opacity;
}

.logo-text.black::before {
  background: linear-gradient(
    100deg,
    rgba(255, 255, 255, 0) 0%,
    rgba(255, 255, 255, 0.5) 40%,
    rgba(255, 255, 255, 1) 50%,
    rgba(255, 255, 255, 0.5) 60%,
    rgba(255, 255, 255, 0) 100%
  );
  mix-blend-mode: screen;
}

.logo-wrapper:hover .logo-text::before {
  animation: shineSweep 1s ease-in-out;
}

@keyframes shineSweep {
  0% { left: -100%; opacity: 0; }
  8% { opacity: 1; }
  85% { opacity: 1; }
  100% { left: 150%; opacity: 0; }
}

/* ===== 左渐变白色底 ===== */
.white-gradient {
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
  height: 100%;
  z-index: 3;
  pointer-events: none;
  background: linear-gradient(to right, #ffffff 0%, #ffffff 85%, rgba(255, 255, 255, 0) 100%);
  transition: width 1.1s cubic-bezier(0.45, 0, 0.15, 1);
  will-change: width;
}

.white-gradient.expand {
  width: 130%;
}

/* ----- 三个交互按钮 ----- */
.action-buttons {
  position: fixed;
  bottom: 8%;
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  display: flex;
  gap: 3rem;
  z-index: 10000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.7s ease 0.2s,
              transform 0.8s cubic-bezier(0.34, 1.56, 0.64, 1) 0.2s;
}

.action-buttons.show {
  opacity: 1;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

.action-btn {
  display: inline-block;
  padding: 0.9rem 2.4rem;
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--color-text);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 50px;
  cursor: pointer;
  text-decoration: none;
  text-align: center;
  box-shadow: var(--shadow-btn);
  transition: transform 0.25s ease, box-shadow 0.25s ease, background 0.25s, border-color 0.25s;
  white-space: nowrap;
}

.action-btn:hover {
  transform: translateY(-4px) scale(1.02);
  box-shadow: var(--shadow-btn-hover);
  background: #f8f9fa;
  border-color: var(--color-primary);
}

.action-btn:active {
  transform: translateY(-1px) scale(0.99);
}

/* 响应式：手机端也同步放大（原 3.5rem × 5 ≈ 17.5rem，用 18rem 取整） */
@media (max-width: 640px) {
  .logo-img { height: 18rem; }
  .action-buttons {
    gap: 1.2rem;
    flex-wrap: wrap;
    justify-content: center;
    bottom: 6%;
    width: 100%;
    padding: 0 1rem;
  }
  .action-btn { padding: 0.7rem 1.4rem; font-size: 0.95rem; }
}