/* 01CDN - 主样式 */
:root {
  --color-bg: #0a0e17;
  --color-surface: #111827;
  --color-surface-hover: #1a2332;
  --color-primary: #06b6d4;
  --color-primary-dim: #0891b2;
  --color-accent: #22d3ee;
  --color-text: #e5e7eb;
  --color-text-muted: #9ca3af;
  --color-border: #1f2937;
  --font-sans: 'Inter', 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --radius: 12px;
  --shadow: 0 4px 24px rgba(6, 182, 212, 0.08);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s;
}
a:hover {
  color: var(--color-accent);
}

/* 头部 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 14, 23, 0.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: 0.05em;
}
.logo span { color: var(--color-primary); }

.nav-main {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  flex-wrap: wrap;
}

.nav-main a {
  color: var(--color-text-muted);
  padding: 0.5rem 0.85rem;
  border-radius: var(--radius);
  font-size: 0.95rem;
}
.nav-main a:hover {
  color: var(--color-text);
  background: var(--color-surface-hover);
}

.lang-switch {
  display: flex;
  gap: 0.25rem;
}
.lang-switch a {
  padding: 0.4rem 0.7rem;
  border-radius: 8px;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}
.lang-switch a.active {
  color: var(--color-primary);
  background: var(--color-surface);
}

/* 主内容区 */
.main-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

.page-title {
  font-size: 2rem;
  margin-bottom: 0.5rem;
  color: var(--color-text);
}
.page-subtitle {
  color: var(--color-text-muted);
  font-size: 1.05rem;
  margin-bottom: 2rem;
}

/* 首页 Hero */
.hero {
  text-align: center;
  padding: 4rem 1.5rem 5rem;
  background: linear-gradient(180deg, rgba(6, 182, 212, 0.06) 0%, transparent 60%);
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  margin-bottom: 1rem;
  letter-spacing: 0.02em;
}
.hero h1 .brand { color: var(--color-accent); }
.hero p {
  color: var(--color-text-muted);
  font-size: 1.2rem;
  max-width: 560px;
  margin: 0 auto 2rem;
}
.hero-cta {
  display: inline-flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
}
.hero-cta .btn {
  display: inline-block;
  padding: 0.85rem 1.6rem;
  border-radius: var(--radius);
  font-weight: 600;
  transition: transform 0.2s, box-shadow 0.2s;
}
.hero-cta .btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dim));
  color: #0a0e17;
}
.hero-cta .btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(6, 182, 212, 0.35);
}
.hero-cta .btn-outline {
  border: 2px solid var(--color-primary);
  color: var(--color-primary);
}
.hero-cta .btn-outline:hover {
  background: var(--color-surface);
  color: var(--color-accent);
}

/* 特性网格 - 每行 3 个，限制单块宽度；按内容高度排列，避免底部大片空白 */
.features {
  display: grid;
  grid-template-columns: repeat(3, minmax(200px, 280px));
  gap: 1.5rem;
  margin-top: 3rem;
  justify-content: center;
  align-items: start;
}
@media (max-width: 900px) {
  .features {
    grid-template-columns: repeat(2, minmax(200px, 280px));
  }
}
@media (max-width: 560px) {
  .features {
    grid-template-columns: minmax(0, 320px);
    justify-content: center;
  }
}

.feature-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.feature-card:hover {
  border-color: var(--color-primary-dim);
  box-shadow: var(--shadow);
}

.feature-card h3 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
  color: var(--color-accent);
}
.feature-card p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 1.55;
  margin: 0;
}

/* 区块标题 */
.section-title {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  color: var(--color-text);
}

/* 价格表 */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.pricing-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem;
  text-align: center;
  transition: border-color 0.2s;
}
.pricing-card.featured {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 1px var(--color-primary);
}
.pricing-card h3 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}
.pricing-card .price {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-primary);
  margin: 1rem 0;
}
.pricing-card .price-note {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: 1rem;
}
.pricing-card ul {
  list-style: none;
  text-align: left;
  margin-bottom: 1.5rem;
}
.pricing-card li {
  padding: 0.4rem 0;
  color: var(--color-text-muted);
  font-size: 0.95rem;
  border-bottom: 1px solid var(--color-border);
}
.pricing-card li:last-child { border-bottom: none; }
.pricing-card .btn {
  display: block;
  width: 100%;
  padding: 0.75rem;
  border-radius: var(--radius);
  font-weight: 600;
  text-align: center;
  background: var(--color-primary);
  color: #0a0e17;
  border: none;
  cursor: pointer;
  transition: background 0.2s;
}
.pricing-card .btn:hover {
  background: var(--color-accent);
}

/* 业务介绍列表 */
.service-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}
.service-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem 2rem;
}
.service-item h3 {
  color: var(--color-accent);
  margin-bottom: 0.5rem;
}
.service-item p {
  color: var(--color-text-muted);
}

/* 关于我们 - 左文右图，视觉优化 */
.about-wrap {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 3rem;
  align-items: center;
  margin-top: 2rem;
}
.about-content {
  min-width: 0;
  padding: 2rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}
.about-content p {
  color: var(--color-text-muted);
  margin-bottom: 1.25rem;
  font-size: 1rem;
  line-height: 1.7;
}
.about-content p:last-child {
  margin-bottom: 0;
}
.about-image {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.25);
}
.about-image img {
  width: 100%;
  height: auto;
  display: block;
  aspect-ratio: 4/3;
  object-fit: cover;
}
@media (max-width: 900px) {
  .about-wrap {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .about-image {
    max-width: 400px;
    margin: 0 auto;
  }
}

/* 联系我们 - 左右结构 */
.contact-wrap {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
  margin-top: 1rem;
}
.contact-info {
  padding: 2rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}
.contact-info p {
  color: var(--color-text-muted);
  margin-bottom: 0.75rem;
  font-size: 1rem;
}
.contact-info p:last-child {
  margin-bottom: 0;
}
.contact-form-wrap {
  min-width: 0;
}
.contact-form label {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}
.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  margin-bottom: 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  color: var(--color-text);
  font-family: inherit;
  font-size: 1rem;
}
.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--color-primary);
}
.contact-form textarea {
  min-height: 140px;
  resize: vertical;
}
.contact-form .btn {
  padding: 0.85rem 2rem;
  border-radius: var(--radius);
  font-weight: 600;
  background: var(--color-primary);
  color: #0a0e17;
  border: none;
  cursor: pointer;
  font-size: 1rem;
}
.contact-form .btn:hover {
  background: var(--color-accent);
}
@media (max-width: 768px) {
  .contact-wrap {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

/* 页脚 */
.site-footer {
  border-top: 1px solid var(--color-border);
  margin-top: 4rem;
  padding: 2rem 1.5rem;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.9rem;
}
.site-footer a {
  color: var(--color-text-muted);
}
.site-footer a:hover {
  color: var(--color-primary);
}

/* 响应式 */
@media (max-width: 768px) {
  .nav-main { width: 100%; justify-content: center; }
  .hero { padding: 3rem 1rem 4rem; }
  .main-content { padding: 1.5rem 1rem 3rem; }
}