/* ========================================
   UI/UX 增强样式
   色彩系统 + 微交互 + 骨架屏 + 动画增强
   ======================================== */

/* ========================================
   零、全局动画增强
   ======================================== */

/* 平滑过渡 */
* {
  transition-timing-function: var(--ease-engineering);
}

/* 页面加载动画 */
@keyframes page-enter {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.page-enter {
  animation: page-enter 0.6s var(--ease-engineering) forwards;
}

/* 悬浮效果增强 */
@keyframes float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

.float-animation {
  animation: float 4s ease-in-out infinite;
}

/* 发光脉冲 */
@keyframes glow-pulse {
  0%, 100% {
    box-shadow: 0 0 20px rgba(59, 130, 246, 0.3);
  }
  50% {
    box-shadow: 0 0 40px rgba(59, 130, 246, 0.5);
  }
}

.glow-pulse {
  animation: glow-pulse 2s ease-in-out infinite;
}

/* 信任背书 stagger 动画 */
@keyframes trust-item-enter {
  from {
    opacity: 0;
    transform: translateY(20px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.trust-item.reveal {
  opacity: 0;
}

.trust-item.reveal.active {
  animation: trust-item-enter 0.5s var(--ease-engineering) forwards;
}

/* Stagger delays for trust items */
.trust-item.reveal[data-reveal-delay="0"].active { animation-delay: 0ms; }
.trust-item.reveal[data-reveal-delay="100"].active { animation-delay: 100ms; }
.trust-item.reveal[data-reveal-delay="200"].active { animation-delay: 200ms; }
.trust-item.reveal[data-reveal-delay="300"].active { animation-delay: 300ms; }
.trust-item.reveal[data-reveal-delay="400"].active { animation-delay: 400ms; }
.trust-item.reveal[data-reveal-delay="500"].active { animation-delay: 500ms; }

/* 卡片悬浮增强 */
.card-float {
  transition: all 0.4s var(--ease-engineering);
}

.card-float:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

/* 按钮磁吸效果 */
.btn-magnetic {
  transition: transform 0.3s var(--ease-engineering);
}

.btn-magnetic:hover {
  transform: scale(1.02);
}

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

/* 文字渐变动画 */
@keyframes gradient-text {
  0%, 100% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
}

.text-gradient-animated {
  background: linear-gradient(90deg, #3b82f6, #22d3ee, #3b82f6);
  background-size: 200% auto;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: gradient-text 3s ease infinite;
}

/* 边框流动效果 */
@keyframes border-flow {
  0% {
    background-position: 0% 50%;
  }
  100% {
    background-position: 200% 50%;
  }
}

.border-flow {
  position: relative;
}

.border-flow::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 2px;
  background: linear-gradient(90deg, #3b82f6, #22d3ee, #3b82f6, #22d3ee);
  background-size: 300% 100%;
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  animation: border-flow 3s linear infinite;
}

/* 滚动指示器 */
.scroll-indicator {
  position: absolute;
  bottom: var(--space-8);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-text-tertiary);
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.scroll-indicator::after {
  content: '';
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--color-brand-primary), transparent);
  animation: scroll-line 1.5s ease-in-out infinite;
}

@keyframes scroll-line {
  0% {
    transform: scaleY(0);
    transform-origin: top;
  }
  50% {
    transform: scaleY(1);
    transform-origin: top;
  }
  50.1% {
    transform-origin: bottom;
  }
  100% {
    transform: scaleY(0);
    transform-origin: bottom;
  }
}

/* 加载 shimmer 效果 */
@keyframes shimmer {
  0% {
    background-position: -200% 0;
  }
  100% {
    background-position: 200% 0;
  }
}

.shimmer {
  background: linear-gradient(
    90deg,
    var(--color-bg-tertiary) 25%,
    var(--color-bg-surface) 50%,
    var(--color-bg-tertiary) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 2s infinite;
}

/* Tooltip 增强 */
.tooltip {
  position: relative;
}

.tooltip::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(-8px);
  padding: var(--space-2) var(--space-3);
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  transition: all var(--duration-fast);
  z-index: 1000;
}

.tooltip:hover::after {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(-4px);
}

/* 焦点环动画 */
@keyframes focus-ring {
  0% {
    box-shadow: 0 0 0 0 rgba(59, 130, 246, 0.4);
  }
  100% {
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0);
  }
}

.focus-ring:focus-visible {
  animation: focus-ring 0.6s ease-out;
}

/* ========================================
   一、色彩系统增强
   ======================================== */

:root {
  /* 功能色系统 */
  --color-success: #10b981;
  --color-success-dim: rgba(16, 185, 129, 0.1);
  --color-warning: #f59e0b;
  --color-warning-dim: rgba(245, 158, 11, 0.1);
  --color-error: #ef4444;
  --color-error-dim: rgba(239, 68, 68, 0.1);
  --color-info: #3b82f6;
  --color-info-dim: rgba(59, 130, 246, 0.1);
}

/* 数据高亮标签 */
.tag-success {
  background: var(--color-success-dim);
  color: var(--color-success);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.tag-warning {
  background: var(--color-warning-dim);
  color: var(--color-warning);
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.tag-error {
  background: var(--color-error-dim);
  color: var(--color-error);
  border: 1px solid rgba(239, 68, 68, 0.3);
}

/* 数据指标高亮 */
.metric-highlight {
  color: var(--color-success);
  font-weight: 600;
}

.metric-highlight-up::before {
  content: '↑';
  margin-right: 4px;
}

/* ========================================
   二、字体层级优化
   ======================================== */

/* 增强正文可读性 */
body {
  font-weight: 400;
  line-height: 1.7;
  letter-spacing: 0.01em;
}

/* 字体大小档位优化 */
.text-display {
  font-size: clamp(3rem, 8vw, 5rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
}

.text-headline {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.text-title {
  font-size: clamp(1.25rem, 3vw, 1.5rem);
  font-weight: 600;
  line-height: 1.3;
}

.text-body {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
}

.text-caption {
  font-size: 0.875rem;
  line-height: 1.5;
  color: var(--color-text-tertiary);
}

.text-small {
  font-size: 0.75rem;
  line-height: 1.4;
  color: var(--color-text-muted);
}

/* 长文本优化 */
.prose {
  max-width: 65ch;
  line-height: 1.8;
}

.prose p + p {
  margin-top: 1.5em;
}

/* ========================================
   三、微交互细节
   ======================================== */

/* 按钮涟漪效果 */
.btn {
  position: relative;
  overflow: hidden;
}

.btn::after {
  content: '';
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  background: radial-gradient(circle, rgba(255,255,255,0.3) 0%, transparent 70%);
  transform: scale(0);
  opacity: 0;
  transition: transform 0.5s, opacity 0.5s;
  pointer-events: none;
}

.btn:active::after {
  transform: scale(2);
  opacity: 1;
  transition: 0s;
}

/* 按钮点击反馈 */
.btn:active {
  transform: scale(0.97);
}

/* 卡片边框发光效果 */
.card-glow {
  transition: all var(--duration-base) var(--ease-stable);
}

.card-glow:hover {
  border-color: var(--color-border-brand);
  box-shadow: 0 0 30px rgba(59, 130, 246, 0.15);
}

/* 导航当前页指示器 */
.nav-link {
  position: relative;
}

.nav-link.active::before {
  content: '';
  position: absolute;
  top: -4px;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 4px;
  background: var(--color-brand-primary);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--color-brand-primary);
}

/* 表单输入高亮 */
.form-input {
  position: relative;
  background: var(--color-bg-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  transition: all var(--duration-fast);
}

.form-input:focus {
  outline: none;
  border-color: var(--color-brand-primary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* 左侧边框高亮动画 */
.form-input-highlight {
  position: relative;
}

.form-input-highlight::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%) scaleY(0);
  width: 3px;
  height: 60%;
  background: var(--gradient-accent);
  border-radius: 0 2px 2px 0;
  transition: transform var(--duration-base);
}

.form-input-highlight:focus-within::before {
  transform: translateY(-50%) scaleY(1);
}

/* 链接下划线动画 */
.link-underline {
  position: relative;
  text-decoration: none;
}

.link-underline::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-brand-primary);
  transition: width var(--duration-base);
}

.link-underline:hover::after {
  width: 100%;
}

/* 数据标签Hover */
.data-tag {
  transition: all var(--duration-fast);
  cursor: default;
}

.data-tag:hover {
  background: var(--color-brand-dim);
  border-color: var(--color-border-brand);
  color: var(--color-brand-primary);
  transform: translateY(-1px);
}

/* 列表项Hover效果 */
.list-item-hover {
  transition: all var(--duration-fast);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  margin: 0 calc(-1 * var(--space-3));
}

.list-item-hover:hover {
  background: var(--color-bg-tertiary);
}

/* 图片Hover缩放 */
.img-zoom {
  overflow: hidden;
}

.img-zoom img {
  transition: transform var(--duration-slow);
}

.img-zoom:hover img {
  transform: scale(1.05);
}

/* 状态指示器脉冲 */
.status-dot {
  width: 8px;
  height: 8px;
  background: var(--color-success);
  border-radius: 50%;
  position: relative;
}

.status-dot::after {
  content: '';
  position: absolute;
  inset: -4px;
  border: 1px solid var(--color-success);
  border-radius: 50%;
  animation: pulse-ring 2s ease-out infinite;
}

@keyframes pulse-ring {
  0% {
    transform: scale(0.8);
    opacity: 1;
  }
  100% {
    transform: scale(2);
    opacity: 0;
  }
}

/* 渐变边框动画 */
.gradient-border {
  position: relative;
  background: var(--color-bg-secondary);
  border-radius: var(--radius-lg);
}

.gradient-border::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-lg);
  padding: 1px;
  background: linear-gradient(135deg, var(--color-brand-primary), var(--color-brand-accent), var(--color-brand-primary));
  background-size: 200% 200%;
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  animation: gradient-shift 3s ease infinite;
}

@keyframes gradient-shift {
  0%, 100% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
}

/* ========================================
   四、骨架屏加载
   ======================================== */

.skeleton {
  background: linear-gradient(
    90deg,
    var(--color-bg-tertiary) 25%,
    var(--color-bg-surface) 50%,
    var(--color-bg-tertiary) 75%
  );
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s ease-in-out infinite;
  border-radius: var(--radius-md);
}

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

.skeleton-text {
  height: 1em;
  margin-bottom: 0.5em;
}

.skeleton-text:last-child {
  width: 80%;
}

.skeleton-title {
  height: 1.5em;
  width: 60%;
  margin-bottom: 1em;
}

.skeleton-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
}

.skeleton-card {
  padding: var(--space-6);
  background: var(--color-bg-secondary);
  border-radius: var(--radius-lg);
}

/* 页面加载遮罩 */
.page-loader {
  position: fixed;
  inset: 0;
  background: var(--color-bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  transition: opacity 0.5s, visibility 0.5s;
}

.page-loader.hidden {
  opacity: 0;
  visibility: hidden;
}

.loader-spinner {
  width: 40px;
  height: 40px;
  border: 2px solid var(--color-border);
  border-top-color: var(--color-brand-primary);
  border-radius: 50%;
  animation: spinner 1s linear infinite;
}

@keyframes spinner {
  to {
    transform: rotate(360deg);
  }
}

/* ========================================
   五、无障碍访问增强
   ======================================== */

/* 焦点样式 */
:focus-visible {
  outline: 2px solid var(--color-brand-primary);
  outline-offset: 2px;
}

/* 跳过链接 */
.skip-link {
  position: absolute;
  top: -100%;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-brand-primary);
  color: white;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  z-index: 10000;
  transition: top var(--duration-fast);
}

.skip-link:focus {
  top: var(--space-4);
}

/* 屏幕阅读器文本 */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* 高对比度模式支持 */
@media (prefers-contrast: high) {
  :root {
    --color-border: rgba(255, 255, 255, 0.3);
    --color-text-secondary: #c0c0c0;
  }
  
  .card,
  .btn {
    border-width: 2px;
  }
}

/* 打印样式 */
@media print {
  .no-print {
    display: none !important;
  }
  
  body {
    background: white;
    color: black;
  }
  
  .card {
    border: 1px solid #ccc;
    break-inside: avoid;
  }
}


/* ========================================
   六、图片懒加载样式
   ======================================== */

/* 图片加载状态 */
img[data-src],
img[data-srcset] {
  opacity: 0;
  transition: opacity 0.5s ease;
}

img.loading {
  opacity: 0.5;
  filter: blur(5px);
}

img.loaded {
  opacity: 1;
  filter: blur(0);
}

img.error {
  opacity: 1;
}

/* 图片占位背景 */
.img-placeholder {
  background: var(--color-bg-tertiary);
  position: relative;
  overflow: hidden;
}

.img-placeholder::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(255, 255, 255, 0.05) 50%,
    transparent 100%
  );
  animation: placeholder-shimmer 1.5s infinite;
}

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

/* 背景图片加载状态 */
[data-bg-src] {
  background-color: var(--color-bg-tertiary);
  transition: background-image 0.5s ease;
}

[data-bg-src].bg-loaded {
  background-color: transparent;
}

/* ========================================
   七、响应式字体优化
   ======================================== */

/* 流体字体大小 */
.fluid-text-sm {
  font-size: clamp(0.875rem, 0.8rem + 0.2vw, 1rem);
}

.fluid-text-base {
  font-size: clamp(1rem, 0.9rem + 0.3vw, 1.125rem);
}

.fluid-text-lg {
  font-size: clamp(1.125rem, 1rem + 0.4vw, 1.25rem);
}

.fluid-text-xl {
  font-size: clamp(1.25rem, 1.1rem + 0.5vw, 1.5rem);
}

.fluid-text-2xl {
  font-size: clamp(1.5rem, 1.2rem + 0.8vw, 2rem);
}

/* ========================================
   八、数据保护模式样式
   ======================================== */

.data-saver .bg-glow,
.data-saver .canvas-container,
.data-saver .gradient-border::before {
  display: none !important;
}

.data-saver img {
  filter: none !important;
}

/* ========================================
   九、平滑滚动优化
   ======================================== */

@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}

/* 滚动吸附（可选） */
.snap-container {
  scroll-snap-type: y proximity;
  overflow-y: auto;
  height: 100vh;
}

.snap-section {
  scroll-snap-align: start;
}

/* ========================================
   十、打印样式增强
   ======================================== */
@media print {
  .no-print {
    display: none !important;
  }
  
  body {
    background: white !important;
    color: black !important;
  }
  
  .card {
    border: 1px solid #ccc;
    break-inside: avoid;
  }
  
  /* 打印时隐藏动画元素 */
  .bg-glow,
  .canvas-container,
  .scroll-indicator,
  .back-to-top {
    display: none !important;
  }
  
  /* 确保链接可点击 */
  a {
    text-decoration: underline;
  }
  
  a[href]::after {
    content: " (" attr(href) ")";
    font-size: 0.8em;
    color: #666;
  }
}