:root {
  --accent: #2563eb;
  --accent-dark: color-mix(in srgb, var(--accent), black 28%);
  --accent-soft: color-mix(in srgb, var(--accent), white 88%);
  --ink: #111827;
  --muted: #6b7280;
  --line: #e5e7eb;
  --bg: #ffffff;
  --bg-alt: #f8fafc;
  --radius: 1rem;
  --shadow: 0 10px 30px rgba(17, 24, 39, .08);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  line-height: 1.65; color: var(--ink); background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

/* ---- navigasi ---- */
.site-nav {
  position: sticky; top: 0; z-index: 50;
  display: flex; justify-content: space-between; align-items: center;
  padding: .9rem 1.5rem;
  background: rgba(255, 255, 255, .85);
  -webkit-backdrop-filter: blur(12px); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.site-nav .brand { font-weight: 800; font-size: 1.1rem; color: var(--accent); letter-spacing: -.02em; }
.nav-links a {
  margin-left: 1.25rem; text-decoration: none; color: #374151;
  font-size: .92rem; font-weight: 500; padding: .35rem 0;
  border-bottom: 2px solid transparent;
}
.nav-links a:hover { color: var(--accent); }
.nav-links a.active { color: var(--accent); border-bottom-color: var(--accent); }

/* ---- hero ---- */
.hero {
  position: relative; overflow: hidden;
  padding: 5.5rem 1.5rem 4.5rem; text-align: center; color: #fff;
  background:
    radial-gradient(60rem 30rem at 85% -10%, rgba(255, 255, 255, .16), transparent 60%),
    radial-gradient(50rem 26rem at 10% 110%, rgba(0, 0, 0, .22), transparent 60%),
    linear-gradient(135deg, var(--accent), var(--accent-dark));
}
.hero h1 {
  font-size: clamp(1.9rem, 5vw, 3rem); line-height: 1.15; letter-spacing: -.02em;
  max-width: 44rem; margin: 0 auto .9rem; font-weight: 800;
}
.hero p { max-width: 42rem; margin: 0 auto 2rem; opacity: .92; font-size: 1.08rem; }
.cta {
  display: inline-block; padding: .85rem 2.1rem; border-radius: 999px;
  background: #fff; color: var(--accent-dark);
  font-weight: 700; text-decoration: none; font-size: 1rem;
  box-shadow: 0 8px 24px rgba(0, 0, 0, .22);
  transition: transform .15s ease, box-shadow .15s ease;
}
.cta:hover { transform: translateY(-2px); box-shadow: 0 12px 28px rgba(0, 0, 0, .28); }

/* ---- section ---- */
section { padding: 3.75rem 1.5rem; }
section:nth-of-type(even) { background: var(--bg-alt); }
section > h2, section > p, .service-grid, .gallery-grid, .faq, .blog {
  max-width: 62rem; margin-left: auto; margin-right: auto;
}
h2 {
  font-size: clamp(1.4rem, 3vw, 1.9rem); letter-spacing: -.01em;
  margin-bottom: 1.4rem; font-weight: 800;
}
h2::after {
  content: ""; display: block; width: 3rem; height: 4px; border-radius: 2px;
  background: var(--accent); margin-top: .6rem;
}
.about p { font-size: 1.05rem; color: #374151; max-width: 62rem; margin: 0 auto; }

/* ---- layanan ---- */
.service-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 1.25rem;
}
.service-card {
  background: #fff; padding: 1.6rem; border-radius: var(--radius);
  border: 1px solid var(--line); box-shadow: var(--shadow);
  transition: transform .15s ease, box-shadow .15s ease;
}
.service-card:hover { transform: translateY(-4px); box-shadow: 0 16px 36px rgba(17, 24, 39, .12); }
.service-card h3 { font-size: 1.08rem; margin-bottom: .5rem; color: var(--accent-dark); }
.service-card p { color: var(--muted); font-size: .95rem; }

/* ---- galeri ---- */
.gallery-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}
.gallery-grid img {
  width: 100%; height: 100%; aspect-ratio: 4 / 3; object-fit: cover;
  border-radius: .75rem; transition: transform .2s ease;
}
.gallery-grid img:hover { transform: scale(1.03); }
.gallery-placeholder { color: var(--muted); font-style: italic; }

/* ---- faq ---- */
.faq details {
  background: #fff; border: 1px solid var(--line); border-radius: .75rem;
  padding: 1rem 1.25rem; margin-bottom: .75rem; max-width: 62rem;
}
.faq summary { font-weight: 650; cursor: pointer; list-style: none; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; float: right; color: var(--accent); font-weight: 800; }
.faq details[open] summary::after { content: "–"; }
.faq details p { margin-top: .6rem; color: var(--muted); }

/* ---- blog ---- */
.blog-item {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1.4rem 1.6rem; margin-bottom: 1rem; box-shadow: var(--shadow);
}
.blog-item h3 { margin-bottom: .4rem; }
.blog-item p { color: var(--muted); }

/* ---- kontak / footer ---- */
.contact {
  text-align: center; padding: 4rem 1.5rem;
  background: linear-gradient(135deg, #111827, #1f2937); color: #e5e7eb;
}
.contact h2 { color: #fff; }
.contact h2::after { margin-left: auto; margin-right: auto; }
.contact p { margin-bottom: 1.75rem; color: #9ca3af; }
.contact .cta { background: var(--accent); color: #fff; }

/* ---- mobile ---- */
@media (max-width: 640px) {
  .nav-links a { margin-left: .8rem; font-size: .85rem; }
  .site-nav .brand { font-size: 1rem; }
  .hero { padding: 3.75rem 1.25rem 3rem; }
  section { padding: 2.75rem 1.25rem; }
}