*,
*::before,
*::after {
  box-sizing: border-box;
}

:root {
  --color-primary: #0369a1;
  --color-primary-light: #0ea5e9;
  --color-bg: #f8fafc;
  --color-text: #1e293b;
  --color-text-muted: #64748b;
  --color-white: #ffffff;
  --font-sans: 'Noto Sans SC', system-ui, sans-serif;
  --max-width: 960px;
  --spacing: 1.5rem;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing);
}

/* Header */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-white);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 3.5rem;
}

.logo {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-primary);
  text-decoration: none;
}

.nav {
  display: flex;
  gap: 1.5rem;
}

.nav a {
  color: var(--color-text);
  text-decoration: none;
  font-weight: 500;
}

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

/* Hero */
.hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  color: var(--color-white);
  padding: 4rem 0;
  text-align: center;
}

.hero-content {
  max-width: 640px;
}

.hero h1 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 700;
}

.hero-tagline {
  margin: 0 0 1.5rem;
  font-size: 1.125rem;
  opacity: 0.95;
}

.btn {
  display: inline-block;
  padding: 0.6rem 1.25rem;
  font-size: 1rem;
  font-weight: 500;
  text-decoration: none;
  border-radius: 6px;
  transition: opacity 0.2s;
}

.btn:hover {
  opacity: 0.9;
}

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

/* Sections */
.section {
  padding: 3rem 0;
}

.section h2 {
  margin: 0 0 1.5rem;
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-primary);
  text-align: center;
}

/* About */
.about {
  background: var(--color-white);
}

.about-text {
  margin: 0 0 1rem;
  color: var(--color-text);
  text-align: center;
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
}

.highlights {
  list-style: none;
  padding: 0;
  margin: 1.5rem auto 0;
  max-width: 480px;
  text-align: center;
}

.highlights li {
  padding: 0.4rem 0;
  position: relative;
  padding-left: 1.5rem;
  text-align: left;
}

.highlights li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.75rem;
  width: 6px;
  height: 6px;
  background: var(--color-primary);
  border-radius: 50%;
}

/* Services */
.service-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.service-card {
  background: var(--color-white);
  padding: 1.5rem;
  border-radius: 8px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
  border: 1px solid #e2e8f0;
}

.service-card h3 {
  margin: 0 0 0.5rem;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-primary);
}

.service-card p {
  margin: 0;
  font-size: 0.95rem;
  color: var(--color-text-muted);
}

/* Contact */
.contact {
  background: var(--color-white);
}

.contact-info {
  max-width: 480px;
  margin: 0 auto;
  padding: 1rem 0;
}

.contact-info p {
  margin: 0.5rem 0;
  color: var(--color-text);
}

/* Footer */
.footer {
  background: var(--color-text);
  color: var(--color-white);
  padding: 1.25rem 0;
  text-align: center;
}

.footer p {
  margin: 0;
  font-size: 0.875rem;
  opacity: 0.9;
}

/* Responsive */
@media (max-width: 640px) {
  .nav {
    gap: 1rem;
  }

  .nav a {
    font-size: 0.9rem;
  }

  .hero {
    padding: 3rem 0;
  }

  .section {
    padding: 2rem 0;
  }
}