/* ==================== 设计令牌 · 二次元粉紫版（弹窗流畅度优化版） ==================== */
:root {
  --primary-hue: 300;
  --primary-sat: 70%;
  --primary-lightness: 75%;
  --primary: hsl(var(--primary-hue), var(--primary-sat), var(--primary-lightness));
  --primary-hover: hsl(var(--primary-hue), calc(var(--primary-sat) + 8%), calc(var(--primary-lightness) + 5%));
  --primary-soft: hsla(var(--primary-hue), var(--primary-sat), var(--primary-lightness), 0.25);
  --primary-glow: hsla(var(--primary-hue), var(--primary-sat), var(--primary-lightness), 0.5);
  
  --success: #ff9eb5;
  --success-hover: #ffb3c6;
  
  --bg-gradient-light: radial-gradient(circle at 10% 20%, #ffe9f4, #f4e4ff 80%, #d9e4ff);
  --card-bg-light: rgba(255, 255, 255, 0.75);
  --card-border-light: rgba(255, 200, 230, 0.7);
  --text-primary-light: #3d2b4f;
  --text-secondary-light: #6b4e7e;
  --text-muted-light: #a58eb5;
  --border-light: rgba(210, 170, 230, 0.5);
  --mask-bg-light: rgba(61, 43, 79, 0.65);
  
  --bg-gradient-dark: radial-gradient(circle at 30% 10%, #2a1e38, #1b1326 100%);
  --card-bg-dark: rgba(40, 30, 55, 0.85);
  --card-border-dark: rgba(200, 160, 240, 0.25);
  --text-primary-dark: #f5eaff;
  --text-secondary-dark: #decbff;
  --text-muted-dark: #b19cd9;
  --border-dark: rgba(170, 130, 220, 0.4);
  --mask-bg-dark: rgba(0, 0, 0, 0.75);
  
  --bg-gradient: var(--bg-gradient-light);
  --card-bg: var(--card-bg-light);
  --card-border: var(--card-border-light);
  --text-primary: var(--text-primary-light);
  --text-secondary: var(--text-secondary-light);
  --text-muted: var(--text-muted-light);
  --border-color: var(--border-light);
  --mask-bg: var(--mask-bg-light);
  
  --shadow-sm: 0 8px 20px -6px rgba(210, 150, 220, 0.3);
  --shadow-md: 0 16px 32px -12px rgba(190, 130, 210, 0.4);
  --shadow-lg: 0 24px 48px -12px rgba(170, 110, 200, 0.5);
  --shadow-xl: 0 32px 64px -16px rgba(150, 90, 190, 0.6);
  
  --radius-sm: 20px;
  --radius-md: 30px;
  --radius-lg: 40px;
  --radius-xl: 50px;
  --radius-full: 9999px;
  
  --transition-fast: 0.2s ease-out;
  --transition-base: 0.3s ease-out;
  --transition-slow: 0.5s ease-out;
}

.dark {
  --bg-gradient: var(--bg-gradient-dark);
  --card-bg: var(--card-bg-dark);
  --card-border: var(--card-border-dark);
  --text-primary: var(--text-primary-dark);
  --text-secondary: var(--text-secondary-dark);
  --text-muted: var(--text-muted-dark);
  --border-color: var(--border-dark);
  --mask-bg: var(--mask-bg-dark);
  --shadow-sm: 0 8px 20px -4px rgba(0, 0, 0, 0.6);
  --shadow-md: 0 16px 36px -8px rgba(0, 0, 0, 0.7);
  --shadow-lg: 0 28px 56px -12px rgba(0, 0, 0, 0.8);
  --shadow-xl: 0 36px 72px -16px rgba(0, 0, 0, 0.9);
}

/* ==================== 弹窗公告核心样式 · 极致流畅优化版 ==================== */
.notice-modal {
  position: fixed !important;
  inset: 0 !important;
  width: 100vw !important;
  height: 100vh !important;
  z-index: 99999 !important;
  background: var(--mask-bg) !important;
  /* 优化毛玻璃性能，减少渲染压力 */
  backdrop-filter: blur(4px) !important;
  -webkit-backdrop-filter: blur(4px) !important;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  padding: 20px !important;
  box-sizing: border-box !important;
  /* 核心：默认隐藏，用opacity和visibility做动画，不触发重排 */
  opacity: 0 !important;
  visibility: hidden !important;
  pointer-events: none !important;
  /* 动画只做opacity，性能最优 */
  transition: opacity 0.25s ease-out, visibility 0.25s ease-out !important;
  /* 告诉浏览器提前准备动画，避免启动卡顿 */
  will-change: opacity, visibility !important;
  overflow: hidden !important;
  margin: 0 !important;
}

/* 弹窗显示状态，JS会自动添加 */
.notice-modal.show {
  opacity: 1 !important;
  visibility: visible !important;
  pointer-events: auto !important;
}

.notice-modal-box {
  background: var(--card-bg) !important;
  border: 2px solid var(--card-border) !important;
  border-radius: var(--radius-xl) !important;
  padding: 40px 30px !important;
  max-width: 500px !important;
  width: 100% !important;
  box-shadow: var(--shadow-xl) !important;
  backdrop-filter: blur(20px) !important;
  -webkit-backdrop-filter: blur(20px) !important;
  /* 核心：开启GPU硬件加速，用3d变换，动画完全不触发重排 */
  transform: translate3d(0, 30px, 0) scale(0.85) !important;
  /* 更丝滑的弹性缓动曲线，动画更自然 */
  transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275) !important;
  position: relative !important;
  overflow: hidden !important;
  box-sizing: border-box !important;
  /* 隔离独立渲染层，避免带动页面重绘 */
  will-change: transform !important;
  transform-style: preserve-3d;
  backface-visibility: hidden;
}

/* 弹窗弹出动画 */
.notice-modal.show .notice-modal-box {
  transform: translate3d(0, 0, 0) scale(1) !important;
}

/* 弹窗背景光晕装饰（优化性能，用渐变替代多元素） */
.notice-modal-box::before {
  content: '';
  position: absolute;
  inset: -50% !important;
  background: radial-gradient(circle at 80% 20%, var(--primary-soft), transparent 60%);
  pointer-events: none;
  opacity: 0.4;
  z-index: 0;
  will-change: opacity;
}

.notice-modal-title {
  position: relative;
  font-size: 28px;
  font-weight: 800;
  text-align: center;
  margin-bottom: 20px;
  background: linear-gradient(145deg, var(--primary), #d9b3ff);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: 1px;
  z-index: 1;
}

.notice-modal-title::before {
  content: "🌸 ";
}
.notice-modal-title::after {
  content: " 🌸";
}

.notice-modal-content {
  position: relative;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: 30px;
  text-align: left;
  word-break: break-word;
  background: rgba(255, 255, 255, 0.2);
  padding: 16px 20px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 1;
}

.notice-modal-close {
  position: relative;
  width: 100%;
  padding: 14px 0;
  border-radius: var(--radius-full);
  border: 2px solid rgba(255, 255, 255, 0.4);
  background: linear-gradient(145deg, var(--primary), var(--primary-hover));
  color: #fff;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  /* 按钮hover也开启硬件加速 */
  transition: all 0.2s ease-out !important;
  transform: translate3d(0, 0, 0);
  box-shadow: 0 16px 32px -12px var(--primary-glow);
  overflow: hidden;
  z-index: 1;
  will-change: transform, box-shadow;
  backface-visibility: hidden;
}

.notice-modal-close::after {
  content: '';
  position: absolute;
  inset: -50% !important;
  background: radial-gradient(circle, rgba(255,255,255,0.3) 10%, transparent 60%);
  opacity: 0;
  transition: opacity 0.2s ease-out;
  pointer-events: none;
}

.notice-modal-close:not(:disabled):hover::after {
  opacity: 1;
}

.notice-modal-close:not(:disabled):hover {
  transform: translate3d(0, -3px, 0) scale(1.02);
  box-shadow: 0 20px 40px -12px var(--primary-glow);
  filter: brightness(1.05);
}

/* 倒计时禁用状态（保留以防万一，但公告按钮不再使用） */
.notice-modal-close:disabled {
  background: var(--text-muted-light) !important;
  box-shadow: none !important;
  transform: none !important;
  cursor: not-allowed !important;
  opacity: 0.6 !important;
}
.dark .notice-modal-close:disabled {
  background: var(--text-muted-dark) !important;
}

/* ==================== 二次元背景小星星（轻量化） ==================== */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image: 
    radial-gradient(2px at 15% 30%, rgba(255, 255, 255, 0.6) 50%, transparent),
    radial-gradient(3px at 75% 15%, rgba(255, 200, 240, 0.5) 50%, transparent);
  z-index: -1;
  opacity: 0.2;
  animation: twinkle 12s infinite alternate;
}

@keyframes twinkle {
  0% { opacity: 0.1; }
  100% { opacity: 0.3; }
}

/* ==================== 全局重置 ==================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Comic Sans MS', 'Chalkboard SE', '幼圆', 'Yuanti SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

html {
  scroll-behavior: smooth;
}

body {
  background: var(--bg-gradient);
  color: var(--text-primary);
  min-height: 100vh;
  transition: background-color 0.4s ease, color 0.3s ease;
  padding: 0 0 40px;
  line-height: 1.6;
  position: relative;
}

/* 滚动条 */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--primary-soft);
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb {
  background: var(--primary);
  border-radius: var(--radius-full);
  border: 2px solid transparent;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--primary-hover);
}

/* ==================== 独立暗黑模式按钮 ==================== */
.floating-mode-btn {
  position: fixed;
  top: 70px;
  right: 24px;
  z-index: 1000;
  padding: 12px 24px;
  border-radius: var(--radius-full);
  background: var(--card-bg);
  color: var(--text-secondary);
  border: 2px solid var(--primary-soft);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  transform: translate3d(0, 0, 0);
  will-change: transform, box-shadow;
}

.floating-mode-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 20px 32px -12px var(--primary-glow);
}

.floating-mode-btn::before {
  content: "🌙✨";
  font-size: 16px;
  opacity: 0.9;
}
.dark .floating-mode-btn::before {
  content: "☀️🌸";
}

/* ==================== 新增：浮动公告按钮 ==================== */
.floating-announce-btn {
  position: fixed;
  bottom: 80px;  /* 位于暗黑模式按钮下方，避免重叠 */
  right: 24px;
  z-index: 1000;
  padding: 12px 24px;
  border-radius: var(--radius-full);
  background: var(--card-bg);
  color: var(--text-secondary);
  border: 2px solid var(--primary-soft);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  transform: translate3d(0, 0, 0);
  will-change: transform, box-shadow;
}

.floating-announce-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 20px 32px -12px var(--primary-glow);
}

.floating-announce-btn::before {
  content: "📢";
  font-size: 16px;
  opacity: 0.9;
}

/* ==================== 跑马灯公告 ==================== */
.notice-bar {
  width: 100%;
  background: linear-gradient(90deg, #ffb3d9, #e0b3ff, #ffb3d9);
  background-size: 200% auto;
  color: #5a3d6b;
  padding: 12px 0;
  font-size: 16px;
  font-weight: 600;
  overflow: hidden;
  white-space: nowrap;
  box-shadow: 0 6px 24px -8px rgba(240, 150, 220, 0.8);
  border-bottom: 2px solid rgba(255, 255, 255, 0.4);
  letter-spacing: 1px;
  text-shadow: 2px 2px 0 rgba(255, 255, 255, 0.3);
}

.notice-content {
  display: inline-block;
  padding-left: 100%;
  animation: scroll 45s linear infinite;
}

.notice-content::before {
  content: "✨ ";
  font-size: 18px;
}
.notice-content::after {
  content: " ✨";
}

@keyframes scroll {
  0% { transform: translateX(0); }
  100% { transform: translateX(-100%); }
}

/* ==================== 主容器 ==================== */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 90px 24px 30px;
  opacity: 0;
  animation: fadeIn 0.6s ease forwards;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ==================== 头部 ==================== */
.header {
  text-align: center;
  margin-bottom: 30px;
  padding: 10px 20px;
}

.site-title {
  font-size: 42px;
  font-weight: 800;
  background: linear-gradient(145deg, #ffaad4, #d9b3ff, #aaccff);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.02em;
  display: inline-block;
  max-width: 90vw;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: transform 0.3s ease;
}

.site-title::before {
  content: "🌟 ";
  font-size: 0.8em;
  color: #ffb347;
}
.site-title::after {
  content: " 🌟";
  font-size: 0.8em;
  color: #ffb347;
}

.site-title:hover {
  transform: scale(1.02);
}

/* ==================== 上传卡片 ==================== */
.upload-card {
  background: var(--card-bg);
  border: 2px solid var(--card-border);
  border-radius: var(--radius-xl);
  padding: 24px;
  box-shadow: var(--shadow-xl);
  margin-bottom: 40px;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  transition: background-color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.upload-zone {
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px 20px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.3s ease, background-color 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
  background: var(--primary-soft);
  position: relative;
  overflow: hidden;
}

.upload-zone::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 50% 0%, var(--primary-soft), transparent 70%);
  opacity: 0;
  transition: opacity 0.4s ease;
  pointer-events: none;
}

.upload-zone:hover::before {
  opacity: 1;
}

.upload-zone:hover {
  border-color: var(--primary);
  transform: scale(1.01);
  box-shadow: 0 20px 40px -16px var(--primary-glow);
}

.upload-zone.dragover {
  border-color: var(--primary);
  background: color-mix(in srgb, var(--primary-soft) 90%, white);
  transform: scale(1.02);
  box-shadow: 0 0 0 8px var(--primary-soft);
}

#file-input {
  display: none;
}

.upload-content h3 {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.upload-tips-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 24px;
}

.upload-tips {
  color: var(--text-secondary);
  font-size: 14px;
  background: rgba(255, 255, 255, 0.2);
  padding: 5px 16px;
  border-radius: var(--radius-full);
  display: inline-block;
  margin: 0 auto;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  border: 1px solid rgba(255, 255, 255, 0.3);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.02);
}

.upload-btn {
  padding: 14px 40px;
  background: linear-gradient(145deg, var(--primary), var(--primary-hover));
  color: #fff;
  border: none;
  border-radius: var(--radius-full);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, filter 0.2s ease;
  box-shadow: 0 20px 36px -14px var(--primary);
  border: 2px solid rgba(255, 255, 255, 0.4);
  position: relative;
  overflow: hidden;
  transform: translate3d(0, 0, 0);
  will-change: transform, box-shadow;
}

.upload-btn::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -60%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255,255,255,0.3) 10%, transparent 60%);
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
}

.upload-btn:hover:not(:disabled)::after {
  opacity: 1;
}

.upload-btn:hover:not(:disabled) {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 28px 48px -16px var(--primary);
  filter: brightness(1.05);
}

.upload-btn:disabled {
  background: #d9b3d0;
  box-shadow: none;
  transform: none;
  cursor: not-allowed;
  opacity: 0.6;
}

/* 进度条 */
.progress-bar {
  width: 100%;
  height: 10px;
  background: rgba(240, 200, 240, 0.3);
  border-radius: var(--radius-full);
  margin-top: 24px;
  overflow: hidden;
  display: none;
  box-shadow: inset 0 2px 6px rgba(0, 0, 0, 0.05);
}

.progress-bar.show {
  display: block;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, #ffb3d9, #d9b3ff, #ffb3d9);
  background-size: 200% 100%;
  width: 0%;
  transition: width 0.3s ease;
  border-radius: var(--radius-full);
  animation: shimmer 2s infinite;
  box-shadow: 0 0 16px #ffb3d9;
}

@keyframes shimmer {
  0% { background-position: 0% 0; }
  100% { background-position: 200% 0; }
}

/* ==================== 文件网格 ==================== */
.file-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px;
}

.file-item {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 2px solid var(--card-border);
  box-shadow: var(--shadow-md);
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
  animation: fadeInUp 0.5s ease both;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  display: flex;
  flex-direction: column;
  transform: translate3d(0, 0, 0);
  will-change: transform, box-shadow;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px) scale(0.96); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.file-item:hover {
  transform: translateY(-6px) scale(1.02);
  box-shadow: var(--shadow-xl), 0 0 0 4px var(--primary-soft);
  border-color: var(--primary);
}

.file-preview {
  width: 100%;
  aspect-ratio: 16 / 10;
  background: var(--bg-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
}

.file-preview::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.05), transparent 50%);
  pointer-events: none;
  opacity: 0.4;
  transition: opacity 0.3s;
}

.file-item:hover .file-preview::after {
  opacity: 0.8;
}

.file-preview img,
.file-preview video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
  opacity: 0;
  animation: imgFadeIn 0.4s ease-out forwards;
  background: #ffe6f0;
}

@keyframes imgFadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.file-item:hover .file-preview img,
.file-item:hover .file-preview video {
  transform: scale(1.08);
}

.file-info {
  padding: 16px 14px 18px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.file-name {
  font-size: 15px;
  font-weight: 600;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--text-primary);
  margin-bottom: 6px;
  line-height: 1.4;
}

.file-size {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 4px;
}

.link-input {
  width: 100%;
  padding: 10px 14px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
  background: rgba(255, 255, 255, 0.2);
  color: var(--text-secondary);
  font-size: 12px;
  outline: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
  margin-bottom: 14px;
  text-overflow: ellipsis;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.link-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px var(--primary-soft);
  background: rgba(255, 255, 255, 0.3);
}

.copy-btn {
  width: 100%;
  padding: 10px 0;
  border-radius: var(--radius-full);
  background: linear-gradient(145deg, var(--success), #ffb3c6);
  color: #5a3d6b;
  border: none;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
  box-shadow: 0 8px 18px -8px #ffb3d9;
  margin-top: auto;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transform: translate3d(0, 0, 0);
  will-change: transform, box-shadow;
}

.copy-btn::before {
  content: "📋";
  font-size: 14px;
}

.copy-btn:hover:not(.copied) {
  background: linear-gradient(145deg, #ffb3c6, var(--success));
  transform: translateY(-2px);
  box-shadow: 0 14px 26px -12px #ff9eb5;
}

.copy-btn:active {
  transform: scale(0.98);
}

.copy-btn.copied {
  background: #d9b3d0;
  box-shadow: none;
  transform: none;
  cursor: default;
  opacity: 0.8;
}
.copy-btn.copied::before {
  content: "✅";
}

/* 空状态 */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-muted);
  font-size: 16px;
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  border: 2px solid var(--card-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  grid-column: 1 / -1;
}

.empty-state::before {
  content: '📂✨';
  font-size: 56px;
  display: block;
  margin-bottom: 20px;
  opacity: 0.7;
  filter: drop-shadow(0 4px 8px rgba(240,150,200,0.3));
}

/* 全屏预览 */
.preview-modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.8);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  animation: fadeIn 0.3s ease;
  cursor: pointer;
}

.preview-modal.show {
  display: flex;
}

.preview-modal img,
.preview-modal video {
  max-width: 95vw;
  max-height: 95vh;
  object-fit: contain;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-xl), 0 0 0 4px rgba(255, 200, 240, 0.6);
  cursor: default;
}

/* 页脚 */
.footer {
  max-width: 1400px;
  margin: 60px auto 0;
  padding: 28px 24px;
  text-align: center;
  font-size: 14px;
  color: var(--text-muted);
  background: var(--card-bg);
  border-radius: var(--radius-xl);
  border: 2px solid var(--card-border);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: var(--shadow-md);
}

.footer a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s;
  padding: 0 8px;
}

.footer a:hover {
  color: var(--primary-hover);
  text-decoration: underline wavy #ffb3d9;
  text-underline-offset: 4px;
}

.footer-links {
  margin-bottom: 16px;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 24px;
}

.footer-links a::before {
  content: "✨";
  margin-right: 4px;
  opacity: 0.7;
}

.copyright {
  margin-bottom: 10px;
  letter-spacing: 0.5px;
}

.beian {
  font-size: 12px;
  opacity: 0.8;
}

/* ==================== 响应式适配 ==================== */
@media (max-width: 768px) {
  /* 弹窗移动端适配 */
  .notice-modal-box {
    padding: 30px 20px;
    max-width: 90vw;
  }
  .notice-modal-title {
    font-size: 24px;
  }
  .notice-modal-content {
    font-size: 15px;
    padding: 14px 16px;
  }
  .notice-modal-close {
    padding: 12px 0;
    font-size: 15px;
  }

  .container { padding: 80px 16px 30px; }
  .site-title { font-size: 32px; }
  .upload-card { padding: 20px; }
  .upload-zone { padding: 30px 16px; }
  .upload-content h3 { font-size: 24px; }
  .upload-tips { font-size: 13px; }
  .file-grid { gap: 16px; grid-template-columns: repeat(auto-fill, minmax(170px, 1fr)); }
  
  /* 浮动按钮移动端尺寸 */
  .floating-mode-btn,
  .floating-announce-btn {
    padding: 10px 20px;
    font-size: 14px;
  }
  .floating-mode-btn { top: 60px; right: 16px; }
  .floating-announce-btn { bottom: 70px; right: 16px; }
}

@media (max-width: 480px) {
  .site-title { font-size: 26px; }
  .upload-btn { padding: 12px 30px; font-size: 15px; }
  .file-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
  .file-preview { aspect-ratio: 4 / 3; }
  .file-info { padding: 12px 10px 14px; }
  .file-name { font-size: 13px; }
  .link-input { padding: 8px 12px; font-size: 11px; }
  .copy-btn { font-size: 12px; padding: 8px 0; }
  
  .floating-mode-btn,
  .floating-announce-btn {
    padding: 8px 14px;
    font-size: 12px;
  }
  .floating-mode-btn { top: 55px; }
  .floating-announce-btn { bottom: 65px; }
}