/* ============================================
   摄影作品展示网站 — 苹果极简风格
   ============================================ */

/* ---- CSS 变量 ---- */
:root {
  /* 颜色 */
  --bg: #f5f5f7;
  --text: #1d1d1f;
  --text-secondary: #86868b;
  --text-tertiary: #aeaeb2;
  --accent: #0071e3;
  --accent-hover: #0077ed;
  --card-bg: #ffffff;
  --card-shadow: 0 1px 3px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.06);
  --card-hover-shadow: 0 8px 24px rgba(0, 0, 0, 0.08), 0 2px 8px rgba(0, 0, 0, 0.06);
  --glass-bg: rgba(245, 245, 247, 0.72);
  --glass-border: rgba(0, 0, 0, 0.08);
  --lightbox-bg: rgba(0, 0, 0, 0.55);
  --lightbox-param-bg: rgba(255, 255, 255, 0.06);
  --divider: rgba(0, 0, 0, 0.08);

  /* 间距 */
  --header-height: 64px;
  --footer-height: 56px;
  --masonry-gap: 16px;
  --content-padding: 20px;
  --card-radius: 12px;
  --lightbox-padding: 40px;

  /* 模糊 */
  --header-blur: 20px;
  --lightbox-blur: 30px;

  /* 过渡 */
  --transition-fast: 0.2s cubic-bezier(0.25, 0.1, 0.25, 1);
  --transition-smooth: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: 0.45s cubic-bezier(0.34, 1.56, 0.64, 1);

  /* 字体 */
  --font-stack: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue",
    Helvetica, Arial, sans-serif;
}

/* ---- 重置 & 基础 ---- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-stack);
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  min-height: 100vh;
  /* 为固定页眉/页脚留出空间 */
  padding-top: calc(var(--header-height) + var(--content-padding));
  padding-bottom: calc(var(--footer-height) + var(--content-padding));
  overflow-x: hidden;
}

/* ---- 固定页眉 ---- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-height);
  background: var(--glass-bg);
  backdrop-filter: blur(var(--header-blur));
  -webkit-backdrop-filter: blur(var(--header-blur));
  border-bottom: 1px solid var(--glass-border);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition-smooth);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 12px;
  max-width: 1400px;
  width: 100%;
  padding: 0 var(--content-padding);
}

.avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
  background: var(--text-tertiary);
}

.site-title {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text);
  white-space: nowrap;
}

/* ---- 瀑布流 ---- */
.masonry {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--content-padding);
  column-count: 4;
  column-gap: var(--masonry-gap);
}

/* 瀑布流卡片 */
.masonry-item {
  break-inside: avoid;
  margin-bottom: var(--masonry-gap);
  border-radius: var(--card-radius);
  overflow: hidden;
  background: var(--card-bg);
  box-shadow: var(--card-shadow);
  cursor: pointer;
  transition: transform var(--transition-smooth), box-shadow var(--transition-smooth);
  -webkit-tap-highlight-color: transparent;
}

.masonry-item:hover {
  transform: translateY(-2px);
  box-shadow: var(--card-hover-shadow);
}

.masonry-item:active {
  transform: scale(0.985);
  transition: transform 0.1s ease;
}

.masonry-item img {
  display: block;
  width: 100%;
  height: auto;
  /* 初始模糊占位效果 */
  background: var(--text-tertiary);
  transition: opacity 0.3s ease;
}

.masonry-item img.loaded {
  opacity: 1;
}

/* ---- 固定页脚 ---- */
.site-footer {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--footer-height);
  background: var(--glass-bg);
  backdrop-filter: blur(var(--header-blur));
  -webkit-backdrop-filter: blur(var(--header-blur));
  border-top: 1px solid var(--glass-border);
  display: flex;
  align-items: center;
  justify-content: center;
}

.footer-inner {
  display: flex;
  align-items: center;
  gap: 28px;
  max-width: 1400px;
  width: 100%;
  padding: 0 var(--content-padding);
  justify-content: center;
}

.footer-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  color: var(--text-secondary);
  border-radius: 50%;
  transition: color var(--transition-fast), background var(--transition-fast);
}

.footer-link:hover {
  color: var(--accent);
  background: rgba(0, 113, 227, 0.06);
}

.footer-link svg {
  width: 20px;
  height: 20px;
}

/* ---- 灯箱 ---- */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-smooth), visibility 0s 0.35s;
}

.lightbox.active {
  opacity: 1;
  visibility: visible;
  transition: opacity var(--transition-smooth), visibility 0s 0s;
}

/* 毛玻璃背景 */
.lightbox-backdrop {
  position: absolute;
  inset: 0;
  background: var(--lightbox-bg);
  backdrop-filter: blur(var(--lightbox-blur));
  -webkit-backdrop-filter: blur(var(--lightbox-blur));
}

/* 关闭按钮 */
.lightbox-close {
  position: absolute;
  top: 20px;
  right: 20px;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: none;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
  cursor: pointer;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.lightbox-close:hover {
  background: rgba(255, 255, 255, 0.25);
  transform: scale(1.08);
}

.lightbox-close:active {
  transform: scale(0.95);
}

/* 导航按钮 */
.lightbox-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border: none;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  cursor: pointer;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: background var(--transition-fast), transform var(--transition-fast),
    opacity var(--transition-fast);
}

.lightbox-nav:hover {
  background: rgba(255, 255, 255, 0.22);
  transform: translateY(-50%) scale(1.08);
}

.lightbox-nav:active {
  transform: translateY(-50%) scale(0.94);
}

.lightbox-prev { left: 20px; }
.lightbox-next { right: 20px; }

/* 灯箱内容 */
.lightbox-content {
  position: relative;
  z-index: 5;
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 32px;
  max-width: calc(100vw - var(--lightbox-padding) * 2);
  max-height: calc(100vh - var(--lightbox-padding) * 2);
  width: 100%;
  height: 100%;
  padding: 0 var(--lightbox-padding);
}

.lightbox-image-wrap {
  flex: 1 1 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 0;
  min-height: 0;
  height: 100%;
}

.lightbox-image-wrap img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  border-radius: 6px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
  opacity: 0;
  transform: scale(0.92);
  transition: opacity var(--transition-smooth), transform var(--transition-spring);
}

.lightbox.active .lightbox-image-wrap img {
  opacity: 1;
  transform: scale(1);
}

/* 参数面板 */
.lightbox-params {
  flex: 0 0 220px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  color: #fff;
  opacity: 0;
  transform: translateX(12px);
  transition: opacity var(--transition-smooth) 0.1s, transform var(--transition-smooth) 0.1s;
}

.lightbox.active .lightbox-params {
  opacity: 1;
  transform: translateX(0);
}

.param-item {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 10px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.param-item:last-child {
  border-bottom: none;
}

.param-label {
  font-size: 13px;
  font-weight: 400;
  color: rgba(255, 255, 255, 0.55);
  letter-spacing: 0.02em;
}

.param-value {
  font-size: 14px;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.9);
  text-align: right;
  letter-spacing: -0.01em;
}

.photo-title {
  font-size: 18px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
  opacity: 0;
  transform: translateY(8px);
  transition: opacity var(--transition-smooth) 0.15s, transform var(--transition-smooth) 0.15s;
}

.lightbox.active .photo-title {
  opacity: 1;
  transform: translateY(0);
}

/* 照片计数器 */
.lightbox-counter {
  position: absolute;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
  font-size: 13px;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.5);
  letter-spacing: 0.04em;
  font-variant-numeric: tabular-nums;
}

/* =============================================
   响应式 - 平板竖屏
   ============================================= */
@media (max-width: 1024px) {
  .masonry {
    column-count: 3;
  }

  .lightbox-content {
    gap: 24px;
    padding: 0 24px;
  }

  .lightbox-params {
    flex: 0 0 180px;
  }
}

/* =============================================
   响应式 - 平板 & 大手机
   ============================================= */
@media (max-width: 768px) {
  :root {
    --header-height: 56px;
    --footer-height: 52px;
    --masonry-gap: 12px;
    --content-padding: 16px;
  }

  .masonry {
    column-count: 2;
  }

  .site-title {
    font-size: 18px;
  }

  /* 竖屏：灯箱切换为纵向布局 */
  .lightbox-content {
    flex-direction: column;
    gap: 20px;
    padding: 0 16px;
    max-width: calc(100vw - 32px);
  }

  .lightbox-image-wrap {
    flex: 0 1 auto;
    height: auto;
    max-height: 50vh;
  }

  .lightbox-params {
    flex: 0 0 auto;
    width: 100%;
    max-width: 400px;
    transform: translateY(12px);
    flex-direction: row;
    flex-wrap: wrap;
    gap: 0;
  }

  .lightbox.active .lightbox-params {
    transform: translateY(0);
  }

  .param-item {
    flex: 1 1 50%;
    padding: 8px 0;
  }

  .photo-title {
    width: 100%;
    text-align: center;
    margin-bottom: 8px;
  }

  .lightbox-prev { left: 8px; }
  .lightbox-next { right: 8px; }

  .lightbox-nav {
    width: 40px;
    height: 40px;
  }

  .lightbox-nav svg {
    width: 24px;
    height: 24px;
  }

  .lightbox-close {
    top: 12px;
    right: 12px;
  }
}

/* =============================================
   响应式 - 小手机
   ============================================= */
@media (max-width: 480px) {
  :root {
    --header-height: 52px;
    --footer-height: 48px;
    --masonry-gap: 8px;
    --content-padding: 12px;
  }

  .masonry {
    column-count: 2;
  }

  .site-title {
    font-size: 16px;
  }

  .avatar {
    width: 34px;
    height: 34px;
  }

  .header-inner {
    gap: 10px;
  }

  .footer-inner {
    gap: 20px;
  }

  .lightbox-params {
    max-width: 100%;
  }

  .param-label {
    font-size: 12px;
  }

  .param-value {
    font-size: 13px;
  }
}

/* =============================================
   响应式 - 大屏幕
   ============================================= */
@media (min-width: 1441px) {
  .masonry {
    column-count: 5;
  }
}

/* =============================================
   辅助类
   ============================================= */
/* 页面加载时的入场动画 */
.masonry-item {
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.6s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes fadeInUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 防止灯箱打开时页面滚动 */
body.lightbox-open {
  overflow: hidden;
  touch-action: none;
}

/* 选择文本颜色 */
::selection {
  background: var(--accent);
  color: #fff;
}