/* ====== 全局基础 ====== */
html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  font-family: "微软雅黑", sans-serif;
  background: linear-gradient(135deg, #1c1c1c, #2e2e2e); /* 深灰渐变 */
  color: #fff;
  overflow-x: hidden;
}

/* ====== 封面 ====== */
#cover {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 100;
  cursor: pointer;
  overflow: hidden;
  background: linear-gradient(270deg, #1e3c72, #2a5298, #6dd5ed, #2193b0);
  background-size: 800% 800%;
  animation: gradientFlow 20s ease infinite;
}

#cover::before {
  content: '';
  position: absolute;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 25px 25px;
  animation: moveParticles 12s linear infinite;
  z-index: 0;
}

.cover-content {
  position: relative;
  z-index: 101;
  text-align: center;
  opacity: 0;
  animation: fadeIn 1.5s forwards;
}

.cover-content h1 {
  font-size: 28px;
  color: #fff;
  text-shadow: 2px 2px 6px rgba(0,0,0,0.5);
  overflow: hidden;
  white-space: nowrap;
  border-right: 2px solid rgba(255,255,255,0.8);
  width: 0;
  animation: typing 2s steps(30) forwards;
}

.cover-content p {
  font-size: 16px;
  color: #eee;
  margin-top: 10px;
  animation: breathe 2.5s infinite alternate;
  text-shadow: 1px 1px 4px rgba(0,0,0,0.4);
}

/* ====== 相册网格 ====== */
#gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 16px;
  padding: 16px;
  background: linear-gradient(180deg, #1c1c1c, #2a2a2a);
}

/* ====== 缩略图统一尺寸 ====== */
#gallery img {
  width: 100%;
  height: 200px;        /* 缩略图统一高度 */
  object-fit: cover;    /* 按比例裁剪填满 */
  border-radius: 12px;
  box-shadow: 0 6px 20px rgba(0,0,0,0.35);
  transition: transform 0.3s ease, filter 0.3s ease, opacity 0.5s;
  cursor: pointer;
  filter: brightness(1.05) contrast(1.1);
  opacity: 0;
  animation: fadeInImg 0.8s forwards;
}

#gallery img:hover {
  transform: scale(1.05);
  filter: brightness(1.1) contrast(1.15);
}

/* ====== 全屏展示 ====== */
.fullscreen {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0,0,0,0.95);
  justify-content: center;
  align-items: center;
  z-index: 9999;
  overflow: hidden;
  touch-action: pan-y;
}

.fullscreen img {
  max-width: 95%;
  max-height: 90%;
  object-fit: contain;   /* 保持原图比例 */
  border-radius: 10px;
}

.photo-caption {
  position: absolute;
  bottom: 20px;
  color: #fff;
  font-size: 14px;
  text-shadow: 1px 1px 5px rgba(0,0,0,0.6);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.fullscreen:hover .photo-caption {
  opacity: 1;
}

/* ====== 动画效果 ====== */
@keyframes fadeIn {
  to { opacity: 1; }
}

@keyframes fadeInImg {
  to { opacity: 1; }
}

@keyframes typing {
  from { width: 0; }
  to { width: 100%; }
}

@keyframes breathe {
  0% { opacity: 0.6; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.05); }
  100% { opacity: 0.6; transform: scale(1); }
}

@keyframes gradientFlow {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

@keyframes moveParticles {
  0% { background-position: 0 0; }
  100% { background-position: 100px 100px; }
}

/* ====== 移动端自适应 ====== */
@media (max-width: 600px){
  .cover-content h1 { font-size: 20px; }
  .cover-content p { font-size: 14px; }
  #gallery { grid-template-columns: repeat(auto-fill, minmax(100px, 1fr)); gap: 12px; padding: 12px; }
  .fullscreen img { max-width: 95%; max-height: 80%; }
}

@media (max-width: 480px){
  #gallery { grid-template-columns: repeat(2, 1fr); gap: 8px; padding: 8px; }
}

@media (min-width: 481px) and (max-width: 768px){
  #gallery { grid-template-columns: repeat(3, 1fr); gap: 10px; padding: 10px; }
}