/* ========================================
   杭州图大深度数据有限公司 - 企业官网
   设计系统：高科技 · 未来感 · 大气
   ======================================== */

/* ===== 设计令牌 ===== */
:root {
  /* 色彩系统 */
  --bg-primary: #060818;
  --bg-secondary: #0a0e27;
  --bg-tertiary: #0f1535;
  --bg-glass: rgba(15, 21, 53, 0.6);
  --bg-glass-hover: rgba(20, 28, 65, 0.8);

  --neon-cyan: #00e5ff;
  --neon-cyan-rgb: 0, 229, 255;
  --neon-purple: #7c3aed;
  --neon-purple-rgb: 124, 58, 237;
  --neon-magenta: #e040fb;
  --neon-magenta-rgb: 224, 64, 251;
  --neon-green: #00ffa3;
  --neon-green-rgb: 0, 255, 163;

  --text-primary: #ffffff;
  --text-secondary: #b4bcdb;
  --text-muted: #6b7399;
  --text-dim: #4a5070;

  --border-glass: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(var(--neon-cyan-rgb), 0.3);

  /* 渐变 */
  --grad-cyan-purple: linear-gradient(135deg, #00e5ff 0%, #7c3aed 100%);
  --grad-purple-magenta: linear-gradient(135deg, #7c3aed 0%, #e040fb 100%);
  --grad-cyan-green: linear-gradient(135deg, #00e5ff 0%, #00ffa3 100%);
  --grad-text: linear-gradient(135deg, #00e5ff 0%, #7c3aed 50%, #e040fb 100%);
  --grad-bg-radial: radial-gradient(ellipse at top, rgba(124, 58, 237, 0.15) 0%, transparent 50%),
                    radial-gradient(ellipse at bottom right, rgba(0, 229, 255, 0.1) 0%, transparent 50%);

  /* 阴影 */
  --shadow-glow-cyan: 0 0 30px rgba(var(--neon-cyan-rgb), 0.3);
  --shadow-glow-purple: 0 0 30px rgba(var(--neon-purple-rgb), 0.3);
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
  --shadow-card-hover: 0 16px 48px rgba(0, 0, 0, 0.5), 0 0 30px rgba(var(--neon-cyan-rgb), 0.15);

  /* 字体 */
  --font-heading: 'Space Grotesk', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;

  /* 圆角 */
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;

  /* 过渡 */
  --ease-premium: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 0.4s var(--ease-premium);
  --transition-fast: 0.2s var(--ease-smooth);
  --transition-slow: 0.8s var(--ease-premium);

  /* 布局 */
  --nav-height: 72px;
  --max-width: 1280px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background: var(--grad-bg-radial);
  z-index: 0;
  pointer-events: none;
}

/* 粒子背景画布 */
#particle-canvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

/* 科技网格背景 */
.tech-grid {
  position: fixed;
  inset: 0;
  z-index: 0;
  background-image:
    linear-gradient(rgba(var(--neon-cyan-rgb), 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(var(--neon-cyan-rgb), 0.03) 1px, transparent 1px);
  background-size: 50px 50px;
  pointer-events: none;
  mask-image: radial-gradient(ellipse at center, black 0%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 0%, transparent 70%);
}

/* ===== 排版 ===== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(2.5rem, 6vw, 4.5rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }
h4 { font-size: clamp(1.2rem, 2vw, 1.5rem); }

p { color: var(--text-secondary); }

a {
  color: var(--neon-cyan);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover { color: var(--neon-magenta); }

.gradient-text {
  background: var(--grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  background-size: 200% auto;
  animation: shimmer 4s linear infinite;
}

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

.glow-text {
  text-shadow: 0 0 20px rgba(var(--neon-cyan-rgb), 0.5);
}

/* ===== 布局容器 ===== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

.section {
  padding: 100px 0;
  position: relative;
  z-index: 1;
}

.section-sm { padding: 60px 0; }

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-header .eyebrow {
  display: inline-block;
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--neon-cyan);
  margin-bottom: 16px;
  padding: 6px 20px;
  border: 1px solid rgba(var(--neon-cyan-rgb), 0.3);
  border-radius: 100px;
  background: rgba(var(--neon-cyan-rgb), 0.05);
}

.section-header h2 {
  margin-bottom: 16px;
}

.section-header p {
  max-width: 900px;
  margin: 0 auto;
  font-size: 1.1rem;
}

/* ===== 导航栏 ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 1000;
  display: flex;
  align-items: center;
  transition: all var(--transition-base);
  background: transparent;
}

.navbar.scrolled {
  background: rgba(6, 8, 24, 0.85);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border-glass);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

/* Logo */
.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text-primary);
  transition: transform var(--transition-fast);
}

.nav-logo:hover { transform: scale(1.02); }

.nav-logo .logo-mark {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: var(--grad-cyan-purple);
  position: relative;
  overflow: hidden;
}

.nav-logo .logo-mark::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--grad-purple-magenta);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.nav-logo:hover .logo-mark::before { opacity: 1; }

.nav-logo .logo-mark svg {
  position: relative;
  z-index: 1;
}

.nav-logo .logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.nav-logo .logo-text .name {
  font-size: 1.1rem;
  background: var(--grad-cyan-purple);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-logo .logo-text .sub {
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  color: var(--text-muted);
  text-transform: uppercase;
}

/* 导航链接 */
.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
}

.nav-links a {
  display: block;
  padding: 8px 18px;
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--grad-cyan-purple);
  transition: all var(--transition-base);
  transform: translateX(-50%);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-primary);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 60%;
}

/* 导航 CTA */
.nav-cta {
  padding: 10px 24px !important;
  background: var(--grad-cyan-purple) !important;
  color: white !important;
  border-radius: 100px !important;
  font-weight: 600 !important;
  box-shadow: 0 4px 20px rgba(var(--neon-cyan-rgb), 0.3);
  transition: all var(--transition-base) !important;
}

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

.nav-cta:hover {
  transform: translateY(-2px) !important;
  box-shadow: 0 8px 30px rgba(var(--neon-cyan-rgb), 0.5) !important;
}

/* 移动端菜单按钮 */
.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  background: var(--bg-glass);
  cursor: pointer;
  align-items: center;
  justify-content: center;
}

.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition-fast);
  position: relative;
}

.nav-toggle span::before,
.nav-toggle span::after {
  content: '';
  position: absolute;
  left: 0;
  width: 20px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition-fast);
}

.nav-toggle span::before { top: -6px; }
.nav-toggle span::after { top: 6px; }

.nav-toggle.open span { background: transparent; }
.nav-toggle.open span::before { top: 0; transform: rotate(45deg); }
.nav-toggle.open span::after { top: 0; transform: rotate(-45deg); }

/* 移动端菜单 */
.mobile-menu {
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  background: rgba(6, 8, 24, 0.95);
  backdrop-filter: blur(30px);
  -webkit-backdrop-filter: blur(30px);
  border-bottom: 1px solid var(--border-glass);
  padding: 20px 24px;
  transform: translateY(-100%);
  opacity: 0;
  pointer-events: none;
  transition: all var(--transition-base);
  z-index: 999;
}

.mobile-menu.open {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}

.mobile-menu a {
  display: block;
  padding: 14px 16px;
  color: var(--text-secondary);
  font-size: 1.1rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.mobile-menu a:hover,
.mobile-menu a.active {
  color: var(--text-primary);
  background: rgba(var(--neon-cyan-rgb), 0.1);
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 32px;
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
  border: none;
  border-radius: 100px;
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
  text-decoration: none;
}

.btn-primary {
  background: var(--grad-cyan-purple);
  color: white;
  box-shadow: 0 4px 20px rgba(var(--neon-cyan-rgb), 0.3);
}

.btn-primary::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--grad-purple-magenta);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.btn-primary span { position: relative; z-index: 1; }

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 40px rgba(var(--neon-cyan-rgb), 0.5);
}

.btn-primary:hover::before { opacity: 1; }

.btn-ghost {
  background: var(--bg-glass);
  color: var(--text-primary);
  border: 1px solid var(--border-glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.btn-ghost:hover {
  border-color: rgba(var(--neon-cyan-rgb), 0.5);
  background: rgba(var(--neon-cyan-rgb), 0.05);
  transform: translateY(-3px);
  box-shadow: 0 4px 20px rgba(var(--neon-cyan-rgb), 0.15);
}

/* ===== 玻璃卡片 ===== */
.glass-card {
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  padding: 32px;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.glass-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(var(--neon-cyan-rgb), 0.5), transparent);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.glass-card:hover {
  background: var(--bg-glass-hover);
  border-color: rgba(var(--neon-cyan-rgb), 0.2);
  transform: translateY(-6px);
  box-shadow: var(--shadow-card-hover);
}

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

/* ===== 页脚 ===== */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-glass);
  padding: 60px 0 30px;
  position: relative;
  z-index: 1;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand .nav-logo { margin-bottom: 20px; }

.footer-brand p {
  font-size: 0.9rem;
  line-height: 1.8;
  max-width: 300px;
}

.footer-col h5 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 20px;
  letter-spacing: 0.05em;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-col a {
  color: var(--text-muted);
  font-size: 0.9rem;
  transition: all var(--transition-fast);
}

.footer-col a:hover {
  color: var(--neon-cyan);
  padding-left: 4px;
}

.footer-bottom {
  border-top: 1px solid var(--border-glass);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-bottom p {
  font-size: 0.85rem;
  color: var(--text-dim);
}

.footer-social {
  display: flex;
  gap: 12px;
}

.footer-social a {
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  transition: all var(--transition-base);
}

.footer-social a:hover {
  border-color: rgba(var(--neon-cyan-rgb), 0.4);
  color: var(--neon-cyan);
  background: rgba(var(--neon-cyan-rgb), 0.05);
  transform: translateY(-2px);
}

/* ===== 滚动动画 ===== */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s var(--ease-premium), transform 0.8s var(--ease-premium);
}

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

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }
.reveal-delay-5 { transition-delay: 0.5s; }

/* ===== 通用工具类 ===== */
.text-center { text-align: center; }
.mt-4 { margin-top: 2rem; }
.mt-6 { margin-top: 3rem; }

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 14px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border-radius: 100px;
  border: 1px solid;
}

.badge-cyan {
  color: var(--neon-cyan);
  border-color: rgba(var(--neon-cyan-rgb), 0.3);
  background: rgba(var(--neon-cyan-rgb), 0.05);
}

.badge-purple {
  color: var(--neon-magenta);
  border-color: rgba(var(--neon-magenta-rgb), 0.3);
  background: rgba(var(--neon-magenta-rgb), 0.05);
}

.badge-green {
  color: var(--neon-green);
  border-color: rgba(var(--neon-green-rgb), 0.3);
  background: rgba(var(--neon-green-rgb), 0.05);
}

/* 脉冲点 */
.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--neon-green);
  position: relative;
}

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

@keyframes pulse-ring {
  0% { transform: scale(0.8); opacity: 1; }
  100% { transform: scale(1.8); opacity: 0; }
}

/* ===== 响应式 ===== */
@media (max-width: 968px) {
  .nav-links { display: none; }
  .nav-toggle { display: flex; }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 30px;
  }

  .footer-brand { grid-column: 1 / -1; }

  .section { padding: 60px 0; }
}

@media (max-width: 640px) {
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .container { padding: 0 16px; }
  .glass-card { padding: 24px; }
}

/* ===== 滚动条 ===== */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb {
  background: rgba(var(--neon-cyan-rgb), 0.2);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover { background: rgba(var(--neon-cyan-rgb), 0.4); }

/* ===== 选中文本 ===== */
::selection {
  background: rgba(var(--neon-cyan-rgb), 0.3);
  color: white;
}

/* ===== 页面入场动画 ===== */
.page-enter {
  animation: pageEnter 0.8s var(--ease-premium);
}

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

/* ===== 浮动动画 ===== */
@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-12px); }
}

.float { animation: float 6s ease-in-out infinite; }
.float-delay { animation: float 6s ease-in-out infinite 2s; }

/* ===== 旋转光环 ===== */
@keyframes spin-slow {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.spin-slow { animation: spin-slow 20s linear infinite; }

/* ===== 渐入光斑 ===== */
.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
  opacity: 0.15;
  pointer-events: none;
  z-index: 0;
}

.orb-cyan {
  background: var(--neon-cyan);
  width: 400px;
  height: 400px;
}

.orb-purple {
  background: var(--neon-purple);
  width: 350px;
  height: 350px;
}

.orb-magenta {
  background: var(--neon-magenta);
  width: 300px;
  height: 300px;
}