/* ===== 踏云信息 — Staraccel 现代风格重构 ===== */
:root {
  --primary: #4f46e5;
  --primary-dark: #4338ca;
  --primary-light: #818cf8;
  --accent: #7c3aed;
  --dark: #0f172a;
  --dark-2: #1e293b;
  --gray-50: #f8fafc;
  --gray-100: #f1f5f9;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e1;
  --gray-400: #94a3b8;
  --gray-500: #64748b;
  --gray-600: #475569;
  --gray-700: #334155;
  --text: #334155;
  --text-light: #94a3b8;
  --white: #ffffff;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(0,0,0,.06);
  --shadow-lg: 0 12px 48px rgba(0,0,0,.1);
  --transition: .3s cubic-bezier(.4,0,.2,1);
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text); background: var(--white); line-height: 1.7; overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }

/* ===== Container ===== */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.section { padding: 100px 0; }
.section-title {
  text-align: center; font-size: 36px; font-weight: 800; color: var(--dark); margin-bottom: 12px;
}
.section-subtitle {
  text-align: center; font-size: 16px; color: var(--gray-500); margin-bottom: 50px; max-width: 600px; margin-left: auto; margin-right: auto;
}
.section-tag {
  display: inline-block; padding: 4px 14px; border-radius: 100px;
  background: rgba(79,70,229,.08); color: var(--primary); font-size: 13px; font-weight: 600; margin-bottom: 12px;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 30px; border-radius: 10px; font-size: 15px; font-weight: 600;
  border: none; cursor: pointer; transition: var(--transition);
}
.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--accent)); color: #fff;
  box-shadow: 0 4px 16px rgba(79,70,229,.3);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 28px rgba(79,70,229,.4); }
.btn-outline {
  background: transparent; color: var(--dark); border: 2px solid var(--gray-200);
}
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }

/* ===== Header / 导航 ===== */
.header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(255,255,255,.85); backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(0,0,0,.04); transition: var(--transition);
}
.header.scrolled { box-shadow: 0 2px 20px rgba(0,0,0,.06); }
.header .container { display: flex; align-items: center; justify-content: space-between; height: 68px; }
.logo { display: flex; align-items: center; gap: 10px; font-size: 20px; font-weight: 800; color: var(--dark); }
.logo .logo-icon {
  width: 34px; height: 34px; border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex; align-items: center; justify-content: center; color: #fff; font-size: 16px; font-weight: 700;
}
.logo span { color: var(--primary); }
.nav { display: flex; align-items: center; gap: 6px; list-style: none; }
.nav a {
  padding: 8px 16px; border-radius: 8px; font-size: 14px; font-weight: 500;
  color: var(--gray-500); transition: var(--transition);
}
.nav a:hover, .nav a.active { color: var(--primary); background: rgba(79,70,229,.06); }
.nav .nav-btn {
  padding: 8px 24px; border-radius: 8px; background: var(--primary-dark); color: #fff !important; font-weight: 700; font-size: 14px;
  position: relative; overflow: hidden; border: 1px solid var(--primary-light);
}
.nav .nav-btn::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,.25), transparent);
  transform: translateX(-100%); animation: navShine 3s ease-in-out infinite;
}
@keyframes navShine { 0% { transform: translateX(-100%); } 20% { transform: translateX(100%); } 100% { transform: translateX(100%); } }
.nav .nav-btn:hover { background: var(--primary); transform: scale(1.04); }
.mobile-toggle { display: none; flex-direction: column; gap: 5px; cursor: pointer; background: none; border: none; padding: 4px; }
.mobile-toggle span { display: block; width: 24px; height: 2px; border-radius: 2px; background: var(--dark); transition: var(--transition); }
.mobile-toggle.open span:nth-child(1) { transform: rotate(45deg) translate(5px,5px); }
.mobile-toggle.open span:nth-child(2) { opacity: 0; }
.mobile-toggle.open span:nth-child(3) { transform: rotate(-45deg) translate(5px,-5px); }

/* ===== Hero ===== */
.hero {
  padding: 140px 24px 80px; min-height: 100vh; display: flex; align-items: center;
  background: linear-gradient(135deg, #f5f7ff 0%, #eef0ff 50%, #f5f7ff 100%);
  position: relative; overflow: hidden;
}
.hero::before {
  content: ''; position: absolute; width: 600px; height: 600px; border-radius: 50%;
  background: radial-gradient(circle, rgba(79,70,229,.06) 0%, transparent 70%);
  top: -200px; right: -100px;
}
.hero::after {
  content: ''; position: absolute; width: 400px; height: 400px; border-radius: 50%;
  background: radial-gradient(circle, rgba(124,58,237,.05) 0%, transparent 70%);
  bottom: -100px; left: -100px;
}
.hero .container {
  max-width: 1200px; margin: 0 auto; width: 100%;
  display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center;
  position: relative; z-index: 1;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 14px; border-radius: 100px;
  background: rgba(79,70,229,.08); color: var(--primary);
  font-size: 13px; font-weight: 600; margin-bottom: 20px;
}
.hero h1 { font-size: 48px; font-weight: 800; line-height: 1.15; color: var(--dark); margin-bottom: 20px; }
.hero h1 span { background: linear-gradient(135deg, var(--primary), var(--accent)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero p { font-size: 17px; color: var(--gray-500); line-height: 1.8; margin-bottom: 32px; max-width: 520px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.hero-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 36px; }
.hero-stat { text-align: center; }
.hero-stat strong { display: block; font-size: 32px; font-weight: 800; background: linear-gradient(135deg, var(--primary), var(--accent)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero-stat span { font-size: 13px; color: var(--gray-400); }
.hero-visual { display: flex; align-items: center; justify-content: center; position: relative; }
.hero-image {
  width: 100%; border-radius: 16px;
  box-shadow: 0 20px 60px rgba(79,70,229,.15);
  transition: transform .6s ease, box-shadow .6s ease;
}
.hero-image:hover { transform: scale(1.02); box-shadow: 0 30px 80px rgba(79,70,229,.25); }
/* Code block hero */
.hero-code-block {
  width: 100%; background: #0f172a; border-radius: 16px; padding: 24px;
  box-shadow: 0 20px 60px rgba(0,0,0,.15);
  font-family: 'JetBrains Mono', 'Cascadia Code', monospace;
  font-size: 13px; line-height: 1.9; color: #e2e8f0;
  position: relative; overflow: hidden;
}
.hero-code-block::before { content: '● ● ●'; position: absolute; top: 10px; left: 14px; color: #475569; font-size: 10px; letter-spacing: 4px; }
.hero-code-block pre { padding-top: 18px; overflow-x: auto; }
.hero-code-block .keyword { color: #818cf8; }
.hero-code-block .string { color: #34d399; }
.hero-code-block .comment { color: #64748b; font-style: italic; }
.hero-code-block .function { color: #5eea9a; }
.hero-code-block .variable { color: #fbbf24; }

/* ===== About ===== */
.about { background: var(--gray-50); }
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.about-text h2 { font-size: 28px; font-weight: 700; color: var(--dark); margin-bottom: 16px; }
.about-text > p { font-size: 15px; color: var(--gray-500); line-height: 1.8; margin-bottom: 24px; }
.about-features { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.about-feature {
  display: flex; align-items: flex-start; gap: 12px;
  padding: 16px; border-radius: 12px; background: var(--gray-100);
}
.about-feature-icon {
  width: 40px; height: 40px; border-radius: 10px;
  background: linear-gradient(135deg, rgba(79,70,229,.1), rgba(79,70,229,.1));
  display: flex; align-items: center; justify-content: center; font-size: 18px; flex-shrink: 0;
}
.about-feature strong { display: block; font-size: 14px; color: var(--dark); margin-bottom: 2px; }
.about-feature span { font-size: 13px; color: var(--gray-500); }
.about-image-card {
  background: linear-gradient(135deg, var(--primary), var(--accent)); border-radius: 20px;
  padding: 40px; text-align: center; position: relative; overflow: hidden;
  min-height: 320px; display: flex; align-items: center; justify-content: center;
}
.about-image-card-inner { color: #fff; position: relative; z-index: 1; }
.about-image-card-inner .big-number { font-size: 64px; font-weight: 900; opacity: .15; position: absolute; top: -20px; right: -10px; line-height: 1; }
.about-image-card-inner h4 { font-size: 22px; font-weight: 700; margin-bottom: 8px; }
.about-image-card-inner p { font-size: 14px; opacity: .85; }

/* ===== Services ===== */
.services { background: var(--gray-100); }
.services-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.service-card {
  background: #fff; border-radius: var(--radius); padding: 32px 28px;
  box-shadow: var(--shadow); transition: var(--transition); border: 1px solid rgba(0,0,0,.04);
}
.service-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.service-icon {
  width: 56px; height: 56px; border-radius: 14px;
  display: flex; align-items: center; justify-content: center; font-size: 26px; margin-bottom: 18px;
  overflow: hidden; transition: transform .4s ease;
}
.service-icon img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s ease; }
.service-card:hover .service-icon img { transform: scale(1.15); }
.service-card h3 { font-size: 18px; font-weight: 700; color: var(--dark); margin-bottom: 10px; }
.service-card p { font-size: 14px; color: var(--gray-500); line-height: 1.7; }
.service-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 14px; }
.service-tags span {
  padding: 3px 10px; border-radius: 6px; font-size: 12px;
  background: var(--gray-100); color: var(--gray-500);
}

/* ===== Cases ===== */
.cases { background: #fff; }
.cases-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.case-card { border-radius: var(--radius); overflow: hidden; border: 1px solid rgba(0,0,0,.06); transition: var(--transition); background: #fff; }
.case-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.case-img { height: 200px; overflow: hidden; position: relative; }
.case-img img { width: 100%; height: 100%; object-fit: cover; transition: transform .6s ease; }
.case-card:hover .case-img img { transform: scale(1.08); }
.case-overlay {
  position: absolute; inset: 0; background: rgba(79,70,229,.7);
  display: flex; align-items: center; justify-content: center;
  opacity: 0; transition: opacity .4s ease; cursor: pointer;
}
.case-overlay span { color: #fff; font-size: 14px; font-weight: 600; border: 2px solid #fff; padding: 6px 20px; border-radius: 24px; }
.case-card:hover .case-overlay { opacity: 1; }
.case-body { padding: 24px; }
.case-category { display: inline-block; padding: 2px 10px; border-radius: 6px; font-size: 11px; font-weight: 500; background: rgba(79,70,229,.08); color: var(--primary); margin-bottom: 8px; }
.case-body h3 { font-size: 17px; font-weight: 700; color: var(--dark); margin-bottom: 6px; }
.case-body p { font-size: 13px; color: var(--gray-500); line-height: 1.7; margin-bottom: 12px; }
.case-tech { display: flex; flex-wrap: wrap; gap: 5px; }
.case-tech span { padding: 2px 10px; border-radius: 6px; font-size: 11px; font-weight: 500; background: rgba(79,70,229,.08); color: var(--primary); }

/* ===== News ===== */
.news { background: var(--gray-50); }
.news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.news-card { border-radius: var(--radius); overflow: hidden; background: #fff; box-shadow: var(--shadow); border: 1px solid rgba(0,0,0,.04); transition: var(--transition); }
.news-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.news-img { height: 200px; overflow: hidden; }
.news-img img { width: 100%; height: 100%; object-fit: cover; transition: transform .6s ease; }
.news-card:hover .news-img img { transform: scale(1.08); }
.news-body { padding: 24px; }
.news-tag { display: inline-block; padding: 2px 10px; border-radius: 6px; font-size: 11px; font-weight: 500; background: rgba(79,70,229,.08); color: var(--primary); margin-bottom: 8px; }
.news-date { font-size: 12px; color: var(--gray-400); }
.news-body h3 { font-size: 17px; font-weight: 700; color: var(--dark); margin-bottom: 8px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.news-body p { font-size: 13px; color: var(--gray-500); line-height: 1.7; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }

/* ===== Contact ===== */
.contact { background: var(--dark); color: #fff; position: relative; overflow: hidden; }
.contact::before {
  content: ''; position: absolute; width: 500px; height: 500px; border-radius: 50%;
  background: radial-gradient(circle, rgba(79,70,229,.1) 0%, transparent 70%);
  top: -200px; right: -150px;
}
.contact-content { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; position: relative; z-index: 1; }
.contact-info h2 { display: none; }
.contact-info h3 { font-size: 32px; font-weight: 800; margin-bottom: 16px; }
.contact-info > p { font-size: 15px; color: rgba(255,255,255,.6); line-height: 1.8; margin-bottom: 32px; }
.contact-item { display: flex; align-items: center; gap: 14px; margin-bottom: 18px; }
.contact-item-icon {
  width: 44px; height: 44px; border-radius: 12px;
  background: rgba(255,255,255,.08);
  display: flex; align-items: center; justify-content: center; font-size: 20px; flex-shrink: 0;
}
.contact-item strong { display: block; font-size: 14px; }
.contact-item .value, .contact-item span { font-size: 13px; color: rgba(255,255,255,.5); }
.contact-form { display: flex; flex-direction: column; gap: 14px; }
.contact-form input, .contact-form textarea {
  width: 100%; padding: 14px 16px; border-radius: 10px;
  border: 1px solid rgba(255,255,255,.1); background: rgba(255,255,255,.06);
  color: #fff; font-size: 14px; outline: none; transition: var(--transition);
  font-family: inherit;
}
.contact-form input::placeholder, .contact-form textarea::placeholder { color: rgba(255,255,255,.35); }
.contact-form input:focus, .contact-form textarea:focus { border-color: var(--primary-light); background: rgba(255,255,255,.1); }
.contact-form textarea { min-height: 120px; resize: vertical; }

/* ===== Footer ===== */
.footer {
  background: #0b1120; color: rgba(255,255,255,.5); padding: 48px 24px 32px; font-size: 13px;
}
.footer-content { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 16px; }
.footer-brand .logo { color: #fff; }
.footer-links { display: flex; gap: 20px; }
.footer-links a:hover { color: var(--primary-light); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.06); padding-top: 24px; margin-top: 24px; text-align: center; font-size: 13px; }

/* ===== 页面头部（内页共用） ===== */
.page-header {
  padding: 120px 0 40px; background: linear-gradient(135deg, #f5f7ff, #eef0ff); text-align: center;
}
.page-header h1 { font-size: 36px; font-weight: 800; color: var(--dark); margin-bottom: 8px; }
.page-header .breadcrumb { color: var(--gray-400); font-size: 14px; }

/* ===== 文章详情 ===== */
.article-body { line-height: 1.9; font-size: 16px; color: #444; }
.article-body img { max-width:100%; border-radius:8px; margin:20px 0; }
.article-body h2 { font-size:24px; margin:32px 0 16px; color:var(--dark); }
.article-body h3 { font-size:20px; margin:24px 0 12px; color:var(--dark); }
.article-body p { margin-bottom:16px; }
.article-body ul, .article-body ol { margin:0 0 16px 20px; }
.article-body li { margin-bottom:8px; }
.article-body pre {
  background:#1e1e2e; color:#e0e0e0; padding:20px; border-radius:8px;
  overflow-x:auto; font-size:14px; line-height:1.6; margin:16px 0;
  font-family: 'JetBrains Mono', 'Cascadia Code', 'Courier New', monospace;
}
.article-body code { background:#f0f0f0; padding:2px 6px; border-radius:4px; font-size:14px; }
.article-body pre code { background:transparent; padding:0; }
.article-body a { color:var(--primary); text-decoration:underline; }
.article-body blockquote {
  border-left:4px solid var(--primary); padding:12px 20px; margin:16px 0;
  background:#f8f9ff; border-radius:0 8px 8px 0; color:#555;
}

/* ===== 广告位 ===== */
.ad-slot {
  text-align: center; padding: 20px; margin: 20px 0;
  border: 1px dashed var(--gray-200); border-radius: 8px; min-height: 90px;
  display: flex; align-items: center; justify-content: center;
  background: var(--gray-50); font-size: 13px; color: var(--gray-400);
}

/* ===== Scroll animation ===== */
.scroll-fade {
  opacity: 0; transform: translateY(24px); transition: opacity .6s ease, transform .6s ease;
}
.scroll-fade.visible { opacity: 1; transform: translateY(0); }

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .hero h1 { font-size: 36px; }
  .hero .container { grid-template-columns: 1fr; gap: 40px; }
  .hero-visual { order: -1; }
  .about-grid { grid-template-columns: 1fr; }
  .services-grid, .cases-grid, .news-grid { grid-template-columns: repeat(2, 1fr); }
  .news-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-content { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  .nav { display: none; }
  .nav.open { display: flex; flex-direction: column; position: absolute; top: 68px; left: 0; right: 0; background: rgba(255,255,255,.98); backdrop-filter: blur(16px); padding: 16px 24px; border-bottom: 1px solid rgba(0,0,0,.06); gap: 4px; }
  .mobile-toggle { display: flex; }
  .hero { padding: 110px 20px 60px; }
  .hero h1 { font-size: 28px; }
  .hero-stats { grid-template-columns: repeat(3,1fr); gap: 8px; }
  .hero-stat strong { font-size: 24px; }
  .hero-image { height: auto; }
  .section { padding: 60px 0; }
  .section-title { font-size: 26px; }
  .section-subtitle { font-size: 15px; }
  .about-features { grid-template-columns: 1fr; }
  .services-grid, .cases-grid, .news-grid { grid-template-columns: 1fr; }
  .contact-content { grid-template-columns: 1fr; }
  .footer-content { flex-direction: column; text-align: center; }
  .page-header { padding: 100px 0 30px; }
  .page-header h1 { font-size: 28px; }
}