/* ========================================
   徐州扬鱼软件科技有限公司 - 科技感企业官网
   文件名：style.css
   描述：科技暗色主题样式，包含粒子背景、渐变光效、响应式布局
======================================== */

/* 变量定义 */
:root {
  --bg-primary: #0a0e17;
  --bg-secondary: #0f172a;
  --bg-tertiary: #1e293b;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent-cyan: #0ea5e9;
  --accent-blue: #3b82f6;
  --accent-purple: #8b5cf6;
  --accent-indigo: #6366f1;
  --border-color: rgba(148, 163, 184, 0.1);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
  --shadow-glow: 0 0 40px rgba(14, 165, 233, 0.15);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
}

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

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

ul {
  list-style: none;
}

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

/* 粒子背景 Canvas */
#particle-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

/* 布局容器 */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* 导航栏 */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(10, 14, 23, 0.6);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid transparent;
  transition: var(--transition-base);
}

.navbar.scrolled {
  background: rgba(10, 14, 23, 0.85);
  border-bottom-color: var(--border-color);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text-primary);
  transition: var(--transition-fast);
}

.nav-logo:hover {
  opacity: 0.9;
}

.logo-icon {
  width: 32px;
  height: 32px;
  color: var(--accent-cyan);
}

.logo-text {
  background: linear-gradient(135deg, var(--text-primary), var(--accent-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  transition: var(--transition-fast);
  padding: 4px 0;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-purple));
  border-radius: 2px;
  transition: var(--transition-base);
}

.nav-link:hover,
.nav-link:focus {
  color: var(--text-primary);
}

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

.nav-cta {
  padding: 8px 20px;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
  color: #fff !important;
  border-radius: var(--radius-sm);
  font-weight: 600;
  transition: var(--transition-base);
}

.nav-cta::after {
  display: none;
}

.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(14, 165, 233, 0.35);
}

/* 移动端导航按钮 */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  z-index: 1001;
}

.hamburger {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  position: relative;
  transition: var(--transition-base);
}

.hamburger::before,
.hamburger::after {
  content: '';
  position: absolute;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  transition: var(--transition-base);
}

.hamburger::before {
  top: -7px;
}

.hamburger::after {
  top: 7px;
}

.nav-toggle.active .hamburger {
  background: transparent;
}

.nav-toggle.active .hamburger::before {
  top: 0;
  transform: rotate(45deg);
}

.nav-toggle.active .hamburger::after {
  top: 0;
  transform: rotate(-45deg);
}

/* Hero 区域 */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 24px 80px;
  overflow: hidden;
  z-index: 1;
}

.hero::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(14, 165, 233, 0.12) 0%, transparent 70%);
  transform: translate(-50%, -50%);
  pointer-events: none;
  z-index: -1;
}

.hero-content {
  max-width: 800px;
  animation: fadeInUp 1s ease-out;
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 24px;
  letter-spacing: -0.02em;
}

.gradient-text {
  background: linear-gradient(135deg, var(--accent-cyan) 0%, var(--accent-purple) 50%, var(--accent-indigo) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  background-size: 200% 200%;
  animation: gradientShift 6s ease infinite;
}

.hero-subtitle {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 40px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition-base);
  border: none;
  outline: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
  color: #fff;
  position: relative;
  overflow: hidden;
}

.btn-primary::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transition: 0.5s;
}

.btn-primary:hover::before {
  left: 100%;
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 32px rgba(14, 165, 233, 0.4);
}

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border: 1.5px solid var(--border-color);
  position: relative;
  overflow: hidden;
}

.btn-secondary:hover {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 20px rgba(14, 165, 233, 0.2);
  transform: translateY(-3px);
}

.btn-block {
  width: 100%;
}

/* 滚动提示 */
.scroll-indicator {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  font-size: 0.75rem;
  animation: bounce 2s infinite;
}

.mouse {
  width: 22px;
  height: 36px;
  border: 2px solid var(--text-muted);
  border-radius: 12px;
  position: relative;
}

.wheel {
  width: 4px;
  height: 8px;
  background: var(--accent-cyan);
  border-radius: 2px;
  position: absolute;
  top: 6px;
  left: 50%;
  transform: translateX(-50%);
  animation: scrollWheel 2s infinite;
}

/* 通用区块 */
.section {
  position: relative;
  padding: 100px 0;
  z-index: 1;
}

.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 64px;
}

.section-tag {
  display: inline-block;
  padding: 6px 16px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--accent-cyan);
  background: rgba(14, 165, 233, 0.1);
  border: 1px solid rgba(14, 165, 233, 0.2);
  border-radius: 100px;
  margin-bottom: 16px;
}

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  margin-bottom: 16px;
  line-height: 1.3;
}

.section-desc {
  font-size: 1.0625rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* 公司简介 */
.about {
  background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}

.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.about-card {
  background: rgba(30, 41, 59, 0.5);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 32px;
  transition: var(--transition-base);
  position: relative;
  overflow: hidden;
}

.about-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-purple));
  opacity: 0;
  transition: var(--transition-base);
}

.about-card:hover {
  transform: translateY(-6px);
  border-color: rgba(14, 165, 233, 0.25);
  box-shadow: var(--shadow-glow);
}

.about-card:hover::before {
  opacity: 1;
}

.about-icon {
  width: 48px;
  height: 48px;
  color: var(--accent-cyan);
  margin-bottom: 20px;
}

.about-card h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 10px;
}

.about-card p {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  line-height: 1.7;
}

/* 服务范围 */
.services {
  background: var(--bg-secondary);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.service-card {
  position: relative;
  background: rgba(30, 41, 59, 0.4);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 40px 32px;
  overflow: hidden;
  transition: var(--transition-base);
}

.service-glow {
  position: absolute;
  top: -50%;
  right: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(14, 165, 233, 0.08) 0%, transparent 60%);
  opacity: 0;
  transition: var(--transition-base);
  pointer-events: none;
}

.service-card:hover {
  border-color: rgba(14, 165, 233, 0.3);
  transform: translateY(-6px);
  box-shadow: var(--shadow-glow);
}

.service-card:hover .service-glow {
  opacity: 1;
}

.service-icon {
  width: 56px;
  height: 56px;
  color: var(--accent-cyan);
  margin-bottom: 24px;
  padding: 12px;
  background: rgba(14, 165, 233, 0.08);
  border-radius: var(--radius-sm);
}

.service-card h3 {
  font-size: 1.375rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.service-card > p {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  line-height: 1.7;
  margin-bottom: 20px;
}

.service-features {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.service-features li {
  font-size: 0.8125rem;
  padding: 4px 12px;
  background: rgba(14, 165, 233, 0.08);
  color: var(--accent-cyan);
  border-radius: 100px;
  border: 1px solid rgba(14, 165, 233, 0.15);
}

/* 技术栈 */
.tech {
  background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
}

.tech-categories {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.tech-category {
  background: rgba(30, 41, 59, 0.4);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 32px;
  transition: var(--transition-base);
}

.tech-category:hover {
  border-color: rgba(14, 165, 233, 0.2);
}

.tech-category h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 20px;
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
  gap: 8px;
}

.tech-category h3::before {
  content: '';
  display: inline-block;
  width: 8px;
  height: 8px;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
  border-radius: 50%;
}

.tech-items {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tech-item {
  font-size: 0.875rem;
  padding: 6px 14px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  transition: var(--transition-fast);
}

.tech-item:hover {
  background: rgba(14, 165, 233, 0.1);
  border-color: rgba(14, 165, 233, 0.3);
  color: var(--text-primary);
  transform: translateY(-2px);
}

/* 案例展示 */
.cases {
  background: var(--bg-primary);
}

.cases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.case-card {
  background: rgba(30, 41, 59, 0.4);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition-base);
}

.case-card:hover {
  transform: translateY(-6px);
  border-color: rgba(14, 165, 233, 0.25);
  box-shadow: var(--shadow-glow);
}

.case-visual {
  height: 180px;
  background: linear-gradient(135deg, rgba(255,255,255,0.02), rgba(255,255,255,0.05));
  display: flex;
  align-items: center;
  justify-content: center;
  border-bottom: 1px solid var(--border-color);
}

.case-visual svg {
  width: 160px;
  height: auto;
}

.case-card h3 {
  font-size: 1.125rem;
  font-weight: 600;
  padding: 24px 24px 8px;
}

.case-card p {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  padding: 0 24px;
  line-height: 1.7;
}

.case-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 16px 24px 24px;
}

.case-tags span {
  font-size: 0.75rem;
  padding: 4px 10px;
  background: rgba(14, 165, 233, 0.08);
  color: var(--accent-cyan);
  border-radius: 100px;
  border: 1px solid rgba(14, 165, 233, 0.15);
}

/* 联系我们 */
.contact {
  background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}

.contact-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}

.contact-info .section-header {
  text-align: left;
  margin-bottom: 40px;
  max-width: 100%;
}

.contact-details {
  font-style: normal;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
}

.contact-item svg {
  width: 24px;
  height: 24px;
  color: var(--accent-cyan);
  flex-shrink: 0;
  margin-top: 2px;
}

.contact-item strong {
  display: block;
  font-weight: 600;
  margin-bottom: 2px;
}

.contact-item span {
  color: var(--text-secondary);
  font-size: 0.9375rem;
}

/* 联系表单 */
.contact-form {
  background: rgba(30, 41, 59, 0.4);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 8px;
  color: var(--text-secondary);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 1rem;
  font-family: inherit;
  transition: var(--transition-fast);
  outline: none;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-muted);
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--accent-cyan);
  background: rgba(14, 165, 233, 0.04);
  box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

/* 页脚 */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 64px 0 24px;
  position: relative;
  z-index: 1;
}

.footer-top {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 64px;
  margin-bottom: 48px;
}

.footer-brand p {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  margin-top: 16px;
  max-width: 320px;
  line-height: 1.7;
}

.footer-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.footer-nav-group h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.footer-nav-group ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-nav-group a {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  transition: var(--transition-fast);
}

.footer-nav-group a:hover {
  color: var(--accent-cyan);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
  color: var(--text-muted);
  font-size: 0.8125rem;
  flex-wrap: wrap;
  gap: 8px;
}

/* 动画关键帧 */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% {
    transform: translateX(-50%) translateY(0);
  }
  40% {
    transform: translateX(-50%) translateY(-10px);
  }
  60% {
    transform: translateX(-50%) translateY(-5px);
  }
}

@keyframes scrollWheel {
  0% {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
  }
  100% {
    opacity: 0;
    transform: translateX(-50%) translateY(12px);
  }
}

/* 滚动显示动画 */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* 响应式 - 平板 */
@media (max-width: 1024px) {
  .contact-wrapper {
    gap: 40px;
  }
}

/* 响应式 - 移动端 */
@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 320px;
    height: 100vh;
    background: rgba(10, 14, 23, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    align-items: flex-start;
    padding: 100px 32px 32px;
    gap: 0;
    transition: right 0.3s ease;
    border-left: 1px solid var(--border-color);
  }

  .nav-menu.active {
    right: 0;
  }

  .nav-menu li {
    width: 100%;
    border-bottom: 1px solid var(--border-color);
  }

  .nav-link {
    display: block;
    padding: 16px 0;
    font-size: 1.125rem;
  }

  .nav-link::after {
    display: none;
  }

  .nav-cta {
    margin-top: 16px;
    text-align: center;
  }

  .nav-toggle {
    display: block;
  }

  .section {
    padding: 72px 0;
  }

  .section-header {
    margin-bottom: 40px;
  }

  .contact-wrapper {
    grid-template-columns: 1fr;
  }

  .contact-info .section-header {
    text-align: center;
  }

  .contact-details {
    align-items: center;
  }

  .contact-item {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 8px;
  }

  .contact-item svg {
    margin-top: 0;
    width: 28px;
    height: 28px;
  }

  .contact-item div {
    text-align: center;
  }

  .footer-top {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .footer-brand {
    text-align: center;
  }

  .footer-brand p {
    max-width: 100%;
  }

  .footer-nav {
    justify-content: center;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  .hero-actions {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 100%;
    max-width: 280px;
  }
}

@media (max-width: 480px) {
  .cases-grid {
    grid-template-columns: 1fr;
  }

  .about-grid,
  .services-grid {
    grid-template-columns: 1fr;
  }

  .contact-form {
    padding: 24px;
  }
}

/* 表单提示文字 */
.form-tip {
  margin-top: 16px;
  font-size: 0.85rem;
  color: #8892a0;
  text-align: center;
  line-height: 1.6;
}

.form-tip a {
  color: #38bdf8;
  text-decoration: none;
  font-weight: 500;
}

.form-tip a:hover {
  text-decoration: underline;
}

/* 语言切换按钮 */
.lang-switch {
  background: transparent;
  border: 1px solid rgba(56, 189, 248, 0.3);
  color: #38bdf8;
  padding: 6px 14px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 500;
  transition: all 0.3s ease;
  margin-left: 8px;
}

.lang-switch:hover {
  background: rgba(56, 189, 248, 0.15);
  border-color: #38bdf8;
  box-shadow: 0 0 12px rgba(56, 189, 248, 0.2);
}

@media (max-width: 768px) {
  .lang-switch {
    margin-left: 0;
    margin-top: 8px;
  }
}