/* ========== 基础样式与重置 ========== */

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  line-height: 1.6;
  letter-spacing: 0.02em;
  overflow-x: hidden;
}

/* ========== 导航栏样式 ========== */

#navbar {
  background: transparent;
  transition: all 0.3s ease;
}

#navbar.scrolled {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  box-shadow: 0 1px 20px rgba(0, 0, 0, 0.08);
}

#navbar.scrolled .nav-link {
  color: #374151;
}

#navbar:not(.scrolled) .nav-link {
  color: rgba(255, 255, 255, 0.9);
}

#navbar:not(.scrolled) #mobile-menu-btn {
  color: white;
}

.nav-link {
  position: relative;
  transition: all 0.3s ease;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(to right, #2196F3, #FF9800);
  transition: width 0.3s ease;
}

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

/* ========== 动画定义 ========== */

/* 淡入上移动画 */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-fade-in-up {
  animation: fadeInUp 0.8s ease-out forwards;
}

.animation-delay-200 {
  animation-delay: 0.2s;
  opacity: 0;
}

.animation-delay-400 {
  animation-delay: 0.4s;
  opacity: 0;
}

.animation-delay-600 {
  animation-delay: 0.6s;
  opacity: 0;
}

.animation-delay-800 {
  animation-delay: 0.8s;
  opacity: 0;
}

.animation-delay-1000 {
  animation-delay: 1s;
  opacity: 0;
}

/* 滚动提示点动画 */
@keyframes scrollDot {
  0%, 100% {
    transform: translateY(0);
    opacity: 1;
  }
  50% {
    transform: translateY(8px);
    opacity: 0.3;
  }
}

.animate-scroll-dot {
  animation: scrollDot 1.5s ease-in-out infinite;
}

/* 滚动触发动画 */
.scroll-animate {
  opacity: 0;
  transform: translateY(40px);
  transition: all 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.scroll-animate.visible {
  opacity: 1;
  transform: translateY(0);
}

/* 脉冲动画 */
@keyframes pulse-glow {
  0%, 100% {
    box-shadow: 0 0 0 0 rgba(33, 150, 243, 0.4);
  }
  50% {
    box-shadow: 0 0 0 12px rgba(33, 150, 243, 0);
  }
}

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

/* 粒子浮动动画 */
@keyframes float-particle {
  0% {
    transform: translateY(100vh) rotate(0deg);
    opacity: 0;
  }
  10% {
    opacity: 1;
  }
  90% {
    opacity: 1;
  }
  100% {
    transform: translateY(-100px) rotate(720deg);
    opacity: 0;
  }
}

.particle {
  position: absolute;
  width: 4px;
  height: 4px;
  background: rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  animation: float-particle linear infinite;
}

/* ========== 卡片样式 ========== */

/* 统计卡片 */
.stat-card {
  transition: all 0.3s ease;
  cursor: default;
}

.stat-card:hover {
  transform: translateY(-4px);
  background: rgba(255, 255, 255, 0.18);
}

/* 服务卡片 */
.service-card {
  transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  position: relative;
  overflow: hidden;
  cursor: pointer;
}

.service-card::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(to right, #2196F3, #FF9800);
  transform: scaleX(0);
  transition: transform 0.4s ease;
}

.service-card:hover::before {
  transform: scaleX(1);
}

.service-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px rgba(33, 150, 243, 0.15);
}

.service-card .service-icon {
  transition: all 0.4s ease;
}

.service-card:hover .service-icon {
  transform: scale(1.15) rotate(5deg);
}

/* Agent 卡片 */
.agent-card {
  transition: all 0.3s ease;
  cursor: pointer;
}

.agent-card:hover {
  transform: translateY(-4px) scale(1.02);
  box-shadow: 0 12px 30px rgba(33, 150, 243, 0.2);
}

/* 文档分类卡片 */
.doc-category {
  transition: all 0.3s ease;
}

.doc-category:hover {
  transform: translateY(-4px);
}

.doc-link {
  transition: all 0.2s ease;
  padding: 4px 0;
  display: inline-block;
}

.doc-link:hover {
  transform: translateX(4px);
}

/* ========== 回到顶部按钮 ========== */

#back-to-top {
  transition: all 0.3s ease;
}

#back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

#back-to-top:hover {
  transform: translateY(-4px);
}

/* ========== 表单样式 ========== */

input:focus,
textarea:focus {
  box-shadow: 0 0 0 3px rgba(33, 150, 243, 0.1);
}

/* ========== 选择高亮 ========== */

::selection {
  background: rgba(33, 150, 243, 0.3);
  color: inherit;
}

/* ========== 滚动条美化 ========== */

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: #f1f5f9;
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(to bottom, #2196F3, #FF9800);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(to bottom, #1565C0, #E65100);
}

/* ========== 响应式调整 ========== */

@media (max-width: 768px) {
  #hero h1 {
    font-size: 2.5rem;
    line-height: 1.2;
  }

  #hero p {
    font-size: 1.125rem;
  }

  .service-card:hover {
    transform: translateY(-4px);
  }

  .stat-card {
    padding: 1rem;
  }

  .stat-card div:first-child {
    font-size: 2rem;
  }
}

@media (max-width: 640px) {
  #hero h1 {
    font-size: 2rem;
  }

  #hero p {
    font-size: 1rem;
  }

  .doc-category {
    padding: 1.5rem;
  }
}

/* ========== 玻璃态效果 ========== */

.glass {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

/* ========== 渐变文字 ========== */

.gradient-text {
  background: linear-gradient(135deg, #2196F3 0%, #FF9800 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ========== 阴影层次 ========== */

.shadow-soft {
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.shadow-hard {
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

/* ========== 提示消息 ========== */

.toast {
  position: fixed;
  top: 100px;
  left: 50%;
  transform: translateX(-50%) translateY(-20px);
  background: linear-gradient(135deg, #2196F3, #1565C0);
  color: white;
  padding: 16px 32px;
  border-radius: 12px;
  font-weight: 500;
  box-shadow: 0 10px 30px rgba(33, 150, 243, 0.3);
  z-index: 9999;
  opacity: 0;
  transition: all 0.4s ease;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ========== 加载动画 ========== */

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

.animate-spin {
  animation: spin 1s linear infinite;
}

/* ========== 打字机效果 ========== */

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

@keyframes blink {
  50% {
    border-color: transparent;
  }
}

.typing-effect {
  overflow: hidden;
  border-right: 2px solid;
  white-space: nowrap;
  animation: typing 3.5s steps(40, end), blink 0.75s step-end infinite;
}

/* ========== 网格背景 ========== */

.grid-background {
  background-image: 
    linear-gradient(rgba(33, 150, 243, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(33, 150, 243, 0.05) 1px, transparent 1px);
  background-size: 50px 50px;
}

/* ========== 发光效果 ========== */

.glow-effect {
  box-shadow: 0 0 20px rgba(33, 150, 243, 0.5);
}

.glow-effect:hover {
  box-shadow: 0 0 30px rgba(33, 150, 243, 0.8);
}

/* ========== 渐变边框 ========== */

.gradient-border {
  position: relative;
  background: white;
  border-radius: 1rem;
}

.gradient-border::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 1rem;
  padding: 2px;
  background: linear-gradient(135deg, #2196F3, #FF9800);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
}

/* ========== 悬浮卡片效果 ========== */

.hover-lift {
  transition: all 0.3s ease;
}

.hover-lift:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

/* ========== 文字阴影 ========== */

.text-shadow {
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
}

.text-shadow-strong {
  text-shadow: 4px 4px 8px rgba(0, 0, 0, 0.3);
}

/* ========== 按钮样式增强 ========== */

button,
a.button {
  position: relative;
  overflow: hidden;
}

button::before,
a.button::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

button:hover::before,
a.button:hover::before {
  width: 300px;
  height: 300px;
}

/* ========== 图片优化 ========== */

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* ========== 无障碍优化 ========== */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* ========== 打印样式 ========== */

@media print {
  #navbar,
  #back-to-top,
  .no-print {
    display: none !important;
  }

  body {
    background: white;
    color: black;
  }

  a {
    text-decoration: underline;
  }
}

/* ========== 深色模式支持（预留） ========== */

@media (prefers-color-scheme: dark) {
  /* 深色模式样式可以在这里添加 */
}