/* ============================================
   易思维特 esweet.cn — 官网样式系统
   主题：科技感深色 / 渐变紫粉 / 毛玻璃
   ============================================ */

/* ---------- 设计令牌 ---------- */
:root {
  /* 背景色 */
  --bg-base: #0a0e1a;
  --bg-surface: #131829;
  --bg-elevated: #1a2138;
  --bg-glass: rgba(26, 33, 56, 0.6);

  /* 渐变 */
  --grad-primary: linear-gradient(135deg, #7c3aed 0%, #ec4899 50%, #f43f5e 100%);
  --grad-primary-soft: linear-gradient(135deg, rgba(124, 58, 237, 0.15) 0%, rgba(236, 72, 153, 0.15) 50%, rgba(244, 63, 94, 0.15) 100%);
  --grad-blue: linear-gradient(135deg, #3b82f6 0%, #06b6d4 100%);
  --grad-text: linear-gradient(135deg, #a78bfa 0%, #f472b6 100%);

  /* 文字色 */
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  /* 边框 */
  --border-subtle: rgba(255, 255, 255, 0.06);
  --border-default: rgba(255, 255, 255, 0.12);
  --border-glow: rgba(236, 72, 153, 0.3);

  /* 间距 */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 6rem;

  /* 圆角 */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 24px;
  --radius-full: 9999px;

  /* 过渡 */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --dur-fast: 0.2s;
  --dur-normal: 0.4s;
  --dur-slow: 0.7s;

  /* 字体 */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* 布局 */
  --container: 1200px;
  --nav-height: 70px;
}

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

html { scroll-behavior: smooth; font-size: 16px; -webkit-text-size-adjust: 100%; }

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

/* 背景光效 */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 800px 600px at 20% 0%, rgba(124, 58, 237, 0.08), transparent),
    radial-gradient(ellipse 600px 400px at 80% 100%, rgba(236, 72, 153, 0.06), transparent);
  pointer-events: none;
  z-index: 0;
}

a { color: inherit; text-decoration: none; transition: color var(--dur-fast) var(--ease-out); }
a:hover { color: #f472b6; }

ul, ol { list-style: none; }

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

button { font-family: inherit; cursor: pointer; border: none; background: none; }

/* ---------- 通用布局 ---------- */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 1.5rem;
  position: relative;
  z-index: 1;
}

.section { padding: var(--space-xl) 0; position: relative; z-index: 1; }
.section-sm { padding: var(--space-lg) 0; }

.text-center { text-align: center; }
.text-grad {
  background: var(--grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ---------- 排版 ---------- */
h1, h2, h3, h4 { line-height: 1.25; font-weight: 700; letter-spacing: -0.02em; }
h1 { font-size: clamp(2.2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.8rem, 4vw, 2.6rem); }
h3 { font-size: clamp(1.2rem, 2.5vw, 1.5rem); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #c084fc;
  padding: 0.3rem 0.8rem;
  border-radius: var(--radius-full);
  background: rgba(124, 58, 237, 0.1);
  border: 1px solid rgba(124, 58, 237, 0.2);
}

.lead { font-size: 1.15rem; color: var(--text-secondary); max-width: 640px; }
.lead.text-center { margin: 0 auto; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.8rem 1.8rem;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.95rem;
  transition: all var(--dur-normal) var(--ease-out);
  white-space: nowrap;
}

.btn-primary {
  background: var(--grad-primary);
  color: #fff;
  box-shadow: 0 4px 20px rgba(236, 72, 153, 0.35);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(236, 72, 153, 0.5);
  color: #fff;
}

.btn-outline {
  border: 1px solid var(--border-default);
  color: var(--text-primary);
  background: var(--bg-glass);
  backdrop-filter: blur(10px);
}
.btn-outline:hover {
  border-color: var(--border-glow);
  background: rgba(236, 72, 153, 0.08);
  color: #fff;
}

.btn-sm { padding: 0.5rem 1.2rem; font-size: 0.85rem; }

/* ---------- 导航栏 ---------- */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-height);
  z-index: 1000;
  display: flex;
  align-items: center;
  background: rgba(10, 14, 26, 0.7);
  backdrop-filter: blur(20px) saturate(150%);
  border-bottom: 1px solid var(--border-subtle);
  transition: all var(--dur-normal) var(--ease-out);
}
.navbar.scrolled {
  background: rgba(10, 14, 26, 0.92);
  border-bottom-color: var(--border-default);
}

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

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 800;
  font-size: 1.25rem;
  color: #fff;
}
.nav-brand img { width: 36px; height: auto; }
.nav-brand span { letter-spacing: -0.02em; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
}
.nav-links a {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 0.3rem 0;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 0;
  width: 0; height: 2px;
  background: var(--grad-primary);
  border-radius: 2px;
  transition: width var(--dur-normal) var(--ease-out);
}
.nav-links a:hover, .nav-links a.active { color: #fff; }
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }

.nav-cta { display: flex; align-items: center; gap: 1rem; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 0.5rem;
}
.nav-toggle span {
  width: 24px; height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: all var(--dur-normal) var(--ease-out);
}
.nav-toggle.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ---------- 轮播通知 ---------- */
.carousel {
  position: relative;
  margin-top: var(--nav-height);
  height: 56px;
  overflow: hidden;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-subtle);
}
.carousel-track {
  display: flex;
  height: 100%;
  transition: transform var(--dur-slow) var(--ease-out);
}
.carousel-slide {
  min-width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0 2rem;
  font-size: 0.92rem;
  color: var(--text-secondary);
}
.carousel-slide .badge {
  flex-shrink: 0;
  padding: 0.15rem 0.6rem;
  border-radius: var(--radius-full);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.05em;
}
.carousel-slide .badge.new { background: rgba(34, 197, 94, 0.15); color: #4ade80; }
.carousel-slide .badge.update { background: rgba(59, 130, 246, 0.15); color: #60a5fa; }
.carousel-slide .badge.event { background: rgba(236, 72, 153, 0.15); color: #f472b6; }
.carousel-slide strong { color: var(--text-primary); }

.carousel-dots {
  position: absolute;
  right: 1.5rem;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  gap: 6px;
}
.carousel-dots button {
  width: 8px; height: 8px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.2);
  transition: all var(--dur-fast) var(--ease-out);
}
.carousel-dots button.active { background: var(--grad-primary); width: 24px; }

/* ---------- Hero ---------- */
.hero {
  min-height: calc(100vh - var(--nav-height) - 56px);
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding: var(--space-lg) 0;
}
.hero::before {
  content: '';
  position: absolute;
  top: 10%; right: -10%;
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(124, 58, 237, 0.15), transparent 70%);
  border-radius: 50%;
  pointer-events: none;
  animation: float 8s ease-in-out infinite;
}
.hero::after {
  content: '';
  position: absolute;
  bottom: -10%; left: -5%;
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(236, 72, 153, 0.12), transparent 70%);
  border-radius: 50%;
  pointer-events: none;
  animation: float 10s ease-in-out infinite reverse;
}

.hero-content { max-width: 720px; position: relative; z-index: 2; }
.hero h1 { margin: 1.5rem 0; }
.hero h1 .text-grad { display: inline-block; }
.hero .lead { margin-bottom: 2rem; }

.hero-actions { display: flex; gap: 1rem; flex-wrap: wrap; }

.hero-stats {
  display: flex;
  gap: 3rem;
  margin-top: 3rem;
  flex-wrap: wrap;
}
.hero-stats .stat .num {
  font-size: 2rem;
  font-weight: 800;
  background: var(--grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-stats .stat .label { font-size: 0.85rem; color: var(--text-muted); }

/* ---------- 服务卡片 ---------- */
.service-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}
.service-card {
  padding: 2rem;
  border-radius: var(--radius-lg);
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-subtle);
  transition: all var(--dur-normal) var(--ease-out);
  position: relative;
  overflow: hidden;
}
.service-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--grad-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur-normal) var(--ease-out);
}
.service-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-glow);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
}
.service-card:hover::before { transform: scaleX(1); }

.service-icon {
  width: 52px; height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: var(--grad-primary-soft);
  margin-bottom: 1.2rem;
  font-size: 1.5rem;
}
.service-card h3 { margin-bottom: 0.6rem; }
.service-card p { color: var(--text-secondary); font-size: 0.92rem; }

/* ---------- 统计区域 ---------- */
.stats-band {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 2rem;
  padding: 3rem 2rem;
  border-radius: var(--radius-lg);
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-subtle);
}
.stats-band .stat { text-align: center; }
.stats-band .num {
  font-size: 2.6rem;
  font-weight: 800;
  background: var(--grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.stats-band .label { color: var(--text-secondary); font-size: 0.9rem; margin-top: 0.3rem; }

/* ---------- 通用卡片网格 ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
}
.info-card {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-subtle);
  transition: all var(--dur-normal) var(--ease-out);
}
.info-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-glow);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.25);
}
.info-card .card-thumb {
  height: 200px;
  background: var(--grad-primary-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  position: relative;
  overflow: hidden;
}
.info-card .card-body { padding: 1.5rem; }
.info-card .card-body h3 { margin-bottom: 0.5rem; font-size: 1.15rem; }
.info-card .card-body p { color: var(--text-secondary); font-size: 0.9rem; }
.info-card .card-tag {
  display: inline-block;
  padding: 0.2rem 0.7rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  background: rgba(124, 58, 237, 0.12);
  color: #c084fc;
  margin-bottom: 0.6rem;
}

/* ---------- 关于我们 ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}
.about-visual {
  border-radius: var(--radius-lg);
  padding: 3rem;
  background: var(--grad-primary-soft);
  border: 1px solid var(--border-subtle);
  text-align: center;
}
.about-visual .logo-big { width: 120px; margin: 0 auto 1.5rem; }
.about-visual h3 { margin-bottom: 0.5rem; }
.about-visual p { color: var(--text-secondary); }

.value-list { margin-top: 2rem; display: grid; gap: 1rem; }
.value-item {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  padding: 1rem;
  border-radius: var(--radius-md);
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
}
.value-item .icon {
  flex-shrink: 0;
  width: 40px; height: 40px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(124, 58, 237, 0.12);
  font-size: 1.2rem;
}
.value-item h4 { font-size: 1rem; margin-bottom: 0.2rem; }
.value-item p { font-size: 0.85rem; color: var(--text-secondary); }

/* ---------- 时间线 ---------- */
.timeline { position: relative; padding-left: 2rem; }
.timeline::before {
  content: '';
  position: absolute;
  left: 6px; top: 0; bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--grad-primary));
  border-radius: 2px;
}
.timeline-item { position: relative; padding-bottom: 2rem; }
.timeline-item::before {
  content: '';
  position: absolute;
  left: -2rem; top: 4px;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--bg-base);
  border: 3px solid #ec4899;
}
.timeline-item .year {
  font-weight: 700;
  font-size: 1rem;
  color: #f472b6;
  margin-bottom: 0.4rem;
}
.timeline-item h4 { font-size: 1.25rem; margin-bottom: 0.4rem; }
.timeline-item p { font-size: 1rem; color: var(--text-secondary); line-height: 1.7; }

/* ---------- 联系表单 ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
}
.contact-info { display: grid; gap: 1.5rem; }
.contact-item {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  padding: 1.2rem;
  border-radius: var(--radius-md);
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
}
.contact-item .icon {
  flex-shrink: 0;
  width: 44px; height: 44px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--grad-primary-soft);
  font-size: 1.2rem;
}
.contact-item .label { font-size: 0.78rem; color: var(--text-muted); margin-bottom: 0.2rem; }
.contact-item .value { font-size: 0.95rem; font-weight: 500; }

.contact-form {
  padding: 2rem;
  border-radius: var(--radius-lg);
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-subtle);
}
.form-group { margin-bottom: 1.2rem; }
.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}
.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  background: rgba(10, 14, 26, 0.5);
  border: 1px solid var(--border-default);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.92rem;
  transition: border-color var(--dur-fast) var(--ease-out);
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: #ec4899;
  box-shadow: 0 0 0 3px rgba(236, 72, 153, 0.1);
}
.form-group textarea { resize: vertical; min-height: 100px; }

/* ---------- CTA 区域 ---------- */
.cta-band {
  text-align: center;
  padding: 4rem 2rem;
  border-radius: var(--radius-lg);
  background: var(--grad-primary-soft);
  border: 1px solid var(--border-default);
  position: relative;
  overflow: hidden;
}
.cta-band::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 50% 50%, rgba(236, 72, 153, 0.08), transparent 70%);
}
.cta-band h2 { margin-bottom: 1rem; }
.cta-band p { color: var(--text-secondary); margin-bottom: 2rem; max-width: 500px; margin-left: auto; margin-right: auto; }
.cta-band .hero-actions { justify-content: center; }

/* ---------- 页脚 ---------- */
.footer {
  border-top: 1px solid var(--border-subtle);
  padding: 3rem 0 2rem;
  position: relative;
  z-index: 1;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}
.footer-brand p { color: var(--text-secondary); font-size: 0.88rem; margin-top: 0.8rem; max-width: 280px; }
.footer-col h4 { font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-muted); margin-bottom: 1rem; }
.footer-col a { display: block; font-size: 0.9rem; color: var(--text-secondary); padding: 0.3rem 0; }
.footer-col a:hover { color: #fff; }
.footer-bottom {
  border-top: 1px solid var(--border-subtle);
  padding-top: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.82rem;
  color: var(--text-muted);
  flex-wrap: wrap;
  gap: 1rem;
}

/* ---------- 页面头部 ---------- */
.page-header {
  padding: var(--space-lg) 0 var(--space-md);
  text-align: center;
  position: relative;
  z-index: 1;
}
.page-header h1 { margin-bottom: 1rem; }

/* ---------- 滚动动画 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity var(--dur-slow) var(--ease-out), transform var(--dur-slow) var(--ease-out);
}
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ---------- 动画 ---------- */
@keyframes float {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(-20px, 20px); }
}

@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 0 20px rgba(236, 72, 153, 0.3); }
  50% { box-shadow: 0 0 40px rgba(236, 72, 153, 0.5); }
}

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .nav-links {
    position: fixed;
    top: var(--nav-height);
    left: 0; right: 0;
    flex-direction: column;
    background: rgba(10, 14, 26, 0.97);
    backdrop-filter: blur(20px);
    padding: 2rem;
    gap: 1.2rem;
    border-bottom: 1px solid var(--border-subtle);
    transform: translateY(-150%);
    transition: transform var(--dur-normal) var(--ease-out);
  }
  .nav-links.open { transform: translateY(0); }
  .nav-toggle { display: flex; }
  .nav-cta .btn { display: none; }

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

  .hero-stats { gap: 1.5rem; }
}

@media (max-width: 600px) {
  .footer-grid { grid-template-columns: 1fr; }
  .hero-stats { flex-direction: column; gap: 1rem; }
  .stats-band { grid-template-columns: 1fr 1fr; }
  .container { padding: 0 1rem; }
  .section { padding: var(--space-lg) 0; }
}