/* kq-net-root-page  -  肯綮科技根域名欢迎页 */
/* 纯静态、零依赖,适配移动端 + 桌面端 */

/* ---------- 1. 设计变量 ---------- */
:root {
  --color-primary:        #2563EB;
  --color-primary-dark:   #1D4ED8;
  --color-primary-light:  #EFF6FF;
  --color-ink:            #0F172A;
  --color-ink-2:          #334155;
  --color-muted:          #64748B;
  --color-muted-2:        #94A3B8;
  --color-line:           #E2E8F0;
  --color-bg:             #F8FAFC;
  --color-bg-hero-start:  #EFF6FF;
  --color-bg-hero-end:    #FFFFFF;
  --radius-lg:            16px;
  --radius-md:            12px;
  --shadow-card:          0 12px 32px rgba(15, 23, 42, 0.06);
  --shadow-cta:           0 8px 20px rgba(37, 99, 235, 0.28);
  --container:            1100px;
}

/* ---------- 2. Reset ---------- */
* { margin: 0; padding: 0; box-sizing: border-box; }

html, body {
  height: 100%;
  background: var(--color-bg);
  color: var(--color-ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.15s;
}
a:hover { color: var(--color-primary-dark); }

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

/* ---------- 3. 顶部 Hero ---------- */
.hero {
  background: linear-gradient(180deg, var(--color-bg-hero-start) 0%, var(--color-bg-hero-end) 100%);
  padding: 88px 20px 72px;
  border-bottom: 1px solid var(--color-line);
}

.hero__inner {
  max-width: var(--container);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.hero__logo {
  width: 96px;
  height: 96px;
  margin-bottom: 28px;
  filter: drop-shadow(0 12px 28px rgba(37, 99, 235, 0.28));
}

.hero__title {
  font-size: 38px;
  font-weight: 700;
  letter-spacing: 1px;
  color: var(--color-ink);
  line-height: 1.3;
  margin-bottom: 14px;
}

.hero__subtitle {
  font-size: 16px;
  color: var(--color-muted);
  letter-spacing: 0.5px;
  margin-bottom: 16px;
}

.hero__desc {
  max-width: 640px;
  font-size: 15px;
  color: var(--color-ink-2);
  margin-bottom: 32px;
  line-height: 1.7;
}

.hero__cta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 32px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: #FFFFFF;
  font-size: 16px;
  font-weight: 600;
  border-radius: 999px;
  box-shadow: var(--shadow-cta);
  transition: transform 0.15s, box-shadow 0.15s;
}
.hero__cta:hover {
  color: #FFFFFF;
  transform: translateY(-1px);
  box-shadow: 0 10px 24px rgba(37, 99, 235, 0.36);
}

/* ---------- 4. 服务卡片 ---------- */
.services {
  max-width: var(--container);
  margin: 0 auto;
  padding: 64px 20px 80px;
}

.services__title {
  text-align: center;
  font-size: 22px;
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: 32px;
  letter-spacing: 1px;
}

.services__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
}

.service {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 22px 20px;
  background: #FFFFFF;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  box-shadow: 0 2px 8px rgba(15, 23, 42, 0.03);
  transition: transform 0.15s, box-shadow 0.15s, border-color 0.15s;
}
.service:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-card);
  border-color: var(--color-primary-light);
}

a.service { color: inherit; }
a.service:hover { color: inherit; }

.service__icon {
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-light);
  color: var(--color-primary);
  border-radius: 10px;
}

.service__body { min-width: 0; }

.service__name {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 6px;
}

.service__desc {
  font-size: 13px;
  color: var(--color-muted);
  line-height: 1.6;
}

/* ---------- 5. 底部 Footer ---------- */
.footer {
  border-top: 1px solid var(--color-line);
  background: #FFFFFF;
  padding: 18px 20px;
}

.footer__inner {
  max-width: var(--container);
  margin: 0 auto;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  font-size: 13px;
  color: var(--color-muted-2);
}

.footer__copy { color: var(--color-muted-2); }

.footer__sep {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--color-muted-2);
  display: inline-block;
}

.footer__icp {
  color: var(--color-muted-2);
  font-weight: 500;
}
.footer__icp:hover { color: var(--color-primary); }

/* ---------- 6. 响应式 ---------- */
@media (max-width: 640px) {
  .hero { padding: 56px 20px 48px; }
  .hero__logo { width: 80px; height: 80px; margin-bottom: 20px; }
  .hero__title { font-size: 26px; }
  .hero__subtitle { font-size: 14px; }
  .hero__desc { font-size: 14px; margin-bottom: 24px; }
  .hero__cta { padding: 12px 24px; font-size: 15px; }

  .services { padding: 40px 16px 56px; }
  .services__title { font-size: 18px; margin-bottom: 20px; }
  .services__grid { grid-template-columns: 1fr; gap: 12px; }
  .service { padding: 18px 16px; }

  .footer__inner { font-size: 12px; gap: 8px; }
}