/* ============================================
   云启科技 - 官网设计系统
   软件开发外包咨询
   ============================================ */

:root {
  --primary: #2563eb;
  --primary-dark: #1e40af;
  --primary-light: #dbeafe;
  --accent: #0ea5e9;
  --text: #1f2937;
  --text-muted: #6b7280;
  --bg: #ffffff;
  --bg-alt: #f8fafc;
  --border: #e5e7eb;
  --radius: 12px;
  --shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.10);
  --max-w: 1120px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

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

a:hover {
  color: var(--primary-dark);
}

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

.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

/* ============ 顶部导航 ============ */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.logo {
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo .mark {
  width: 34px;
  height: 34px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 18px;
  font-weight: 800;
}

.nav-links {
  display: flex;
  gap: 8px;
  list-style: none;
  align-items: center;
}

.nav-links a {
  display: block;
  padding: 8px 16px;
  border-radius: 8px;
  color: var(--text-muted);
  font-size: 15px;
}

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

.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: var(--text);
}

/* ============ Hero ============ */
.hero {
  padding: 96px 0 72px;
  background: linear-gradient(180deg, var(--bg-alt) 0%, var(--bg) 100%);
  text-align: center;
}

.hero .badge {
  display: inline-block;
  padding: 6px 16px;
  border-radius: 999px;
  background: var(--primary-light);
  color: var(--primary-dark);
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 24px;
}

.hero h1 {
  font-size: 44px;
  line-height: 1.25;
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 20px;
}

.hero h1 .highlight {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero p.sub {
  font-size: 19px;
  color: var(--text-muted);
  max-width: 680px;
  margin: 0 auto 36px;
}

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

.btn {
  display: inline-block;
  padding: 13px 28px;
  border-radius: 10px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.2s;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}

.btn-primary:hover {
  background: var(--primary-dark);
  color: #fff;
}

.btn-outline {
  background: #fff;
  color: var(--text);
  border-color: var(--border);
}

.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.hero .stats {
  display: flex;
  gap: 48px;
  justify-content: center;
  margin-top: 56px;
  flex-wrap: wrap;
}

.hero .stats .num {
  font-size: 32px;
  font-weight: 800;
  color: var(--primary);
}

.hero .stats .label {
  font-size: 14px;
  color: var(--text-muted);
}

/* ============ 通用 section ============ */
.section {
  padding: 72px 0;
}

.section.alt {
  background: var(--bg-alt);
}

.section-head {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 48px;
}

.section-head h2 {
  font-size: 32px;
  font-weight: 800;
  margin-bottom: 12px;
}

.section-head p {
  color: var(--text-muted);
  font-size: 16px;
}

/* ============ 服务卡片 ============ */
.grid {
  display: grid;
  gap: 24px;
}

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid-2 {
  grid-template-columns: repeat(2, 1fr);
}

.card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: all 0.25s;
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-3px);
  border-color: transparent;
}

.card .icon {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  background: var(--primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: 18px;
}

.card h3 {
  font-size: 19px;
  margin-bottom: 10px;
}

.card p {
  color: var(--text-muted);
  font-size: 15px;
}

/* ============ 流程 ============ */
.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.step {
  text-align: center;
  position: relative;
}

.step .num {
  width: 44px;
  height: 44px;
  margin: 0 auto 14px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  font-weight: 700;
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.step h4 {
  font-size: 17px;
  margin-bottom: 6px;
}

.step p {
  font-size: 14px;
  color: var(--text-muted);
}

/* ============ 页脚 ============ */
.footer {
  background: #111827;
  color: #9ca3af;
  padding: 48px 0 24px;
  margin-top: 40px;
}

.footer .container {
  display: flex;
  flex-wrap: wrap;
  gap: 32px;
  justify-content: space-between;
}

.footer h4 {
  color: #fff;
  font-size: 16px;
  margin-bottom: 14px;
}

.footer a {
  color: #9ca3af;
  display: block;
  padding: 4px 0;
}

.footer a:hover {
  color: #fff;
}

.footer .col {
  min-width: 160px;
}

.footer .filing {
  width: 100%;
  border-top: 1px solid #374151;
  padding-top: 20px;
  margin-top: 8px;
  text-align: center;
  font-size: 13px;
}

.footer .filing a {
  display: inline;
  color: #9ca3af;
}

.footer .filing a:hover {
  color: #fff;
}

/* ============ 页面头部（内页） ============ */
.page-hero {
  padding: 72px 0 48px;
  background: linear-gradient(180deg, var(--bg-alt) 0%, var(--bg) 100%);
  text-align: center;
}

.page-hero h1 {
  font-size: 36px;
  font-weight: 800;
  margin-bottom: 12px;
}

.page-hero p {
  color: var(--text-muted);
  font-size: 17px;
}

/* ============ 联系表单 ============ */
.form {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 560px;
}

.form input,
.form textarea,
.form select {
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 15px;
  font-family: inherit;
}

.form input:focus,
.form textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}

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

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.contact-info .item {
  display: flex;
  gap: 14px;
  margin-bottom: 20px;
}

.contact-info .item .ico {
  font-size: 22px;
}

.contact-info .item .label {
  font-size: 13px;
  color: var(--text-muted);
}

.contact-info .item .val {
  font-size: 16px;
  font-weight: 600;
}

/* ============ 响应式 ============ */
@media (max-width: 900px) {
  .grid-3 { grid-template-columns: 1fr 1fr; }
  .steps { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .hero h1 { font-size: 34px; }
}

@media (max-width: 640px) {
  .grid-3, .grid-2, .steps { grid-template-columns: 1fr; }
  .hero h1 { font-size: 28px; }
  .nav-links {
    display: none;
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    background: #fff;
    flex-direction: column;
    padding: 16px;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
  }
  .nav-links.open { display: flex; }
  .nav-toggle { display: block; }
  .hero .stats { gap: 24px; }
}