/* ── Reset & Base ──────────────────────────────── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --brand: #00d4ff;
  --brand-dim: rgba(0, 212, 255, 0.15);
  --brand-glow: rgba(0, 212, 255, 0.08);
  --accent: #7b61ff;
  --dark: #06090f;
  --dark-2: #0c1017;
  --dark-3: #111820;
  --border: rgba(255, 255, 255, 0.06);
  --border-hover: rgba(0, 212, 255, 0.3);
  --gray: #7a8599;
  --light: #b8c4d6;
  --white: #e8edf5;
  --radius: 8px;
  --transition: 0.3s ease;
  --font-mono: "SF Mono", "Fira Code", "Cascadia Code", monospace;
}

html { scroll-behavior: smooth; scroll-padding-top: 80px; }

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--dark);
  color: var(--light);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.container { max-width: 1160px; margin: 0 auto; padding: 0 28px; }

a { color: inherit; text-decoration: none; }

/* ── Header ───────────────────────────────────── */
.header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(6, 9, 15, 0.88);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}

.nav { display: flex; align-items: center; justify-content: space-between; height: 72px; }

.logo {
  font-size: 1.4rem; font-weight: 700; color: var(--white);
  letter-spacing: -0.5px;
}
.logo span { color: var(--brand); font-weight: 400; }

.nav-links { display: flex; align-items: center; gap: 32px; list-style: none; }
.nav-links a {
  font-size: 0.85rem; font-weight: 500; color: var(--gray);
  letter-spacing: 0.02em; transition: color var(--transition);
}
.nav-links a:hover { color: var(--white); }

.nav-toggle {
  display: none; background: none; border: none; cursor: pointer;
  flex-direction: column; gap: 5px; padding: 4px;
}
.nav-toggle span {
  display: block; width: 24px; height: 2px; background: var(--light);
  border-radius: 2px; transition: var(--transition);
}

/* ── Buttons ──────────────────────────────────── */
.btn {
  display: inline-block; padding: 12px 28px;
  background: var(--brand); color: var(--dark); font-weight: 600;
  font-size: 0.9rem; border-radius: var(--radius);
  border: 1px solid var(--brand);
  cursor: pointer; transition: all var(--transition);
  letter-spacing: 0.01em;
}
.btn:hover {
  background: #33dfff; border-color: #33dfff;
  box-shadow: 0 0 24px rgba(0, 212, 255, 0.25);
}
.btn-outline {
  background: transparent; color: var(--brand);
  border: 1px solid rgba(0, 212, 255, 0.35);
}
.btn-outline:hover {
  background: var(--brand-dim); color: var(--white);
  border-color: var(--brand);
}
.btn-sm { padding: 8px 20px; font-size: 0.8rem; }

/* ── Hero ─────────────────────────────────────── */
.hero {
  position: relative; padding: 160px 0 100px; overflow: hidden;
  background: radial-gradient(ellipse at 30% 0%, rgba(0, 212, 255, 0.06) 0%, transparent 50%),
              radial-gradient(ellipse at 70% 20%, rgba(123, 97, 255, 0.04) 0%, transparent 50%);
}

.hero-grid-bg {
  position: absolute; inset: 0; opacity: 0.035;
  background-image:
    linear-gradient(rgba(0, 212, 255, 1) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 212, 255, 1) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at 50% 30%, black 20%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at 50% 30%, black 20%, transparent 70%);
}

.hero-inner {
  position: relative; z-index: 1;
  display: grid; grid-template-columns: 1fr 1fr; gap: 40px;
  align-items: center;
}
.hero-content { position: relative; }

.hero-badge {
  display: inline-block; padding: 6px 16px;
  font-size: 0.75rem; font-weight: 600; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--brand);
  border: 1px solid rgba(0, 212, 255, 0.2);
  border-radius: 20px; margin-bottom: 24px;
  background: rgba(0, 212, 255, 0.05);
}

.hero h1 {
  font-size: clamp(2.4rem, 5vw, 3.8rem); font-weight: 800;
  color: var(--white); line-height: 1.1; letter-spacing: -1.5px;
  max-width: 780px;
}

.hero-sub {
  margin-top: 24px; font-size: 1.1rem; color: var(--gray);
  max-width: 600px; line-height: 1.75;
}

.hero-actions { margin-top: 36px; display: flex; gap: 16px; flex-wrap: wrap; }

.hero-tags {
  display: flex; flex-wrap: wrap; gap: 10px; margin-top: 48px;
}
.hero-tags span {
  padding: 5px 14px; font-size: 0.75rem; font-weight: 500;
  font-family: var(--font-mono);
  color: var(--gray); background: var(--dark-2);
  border: 1px solid var(--border); border-radius: 4px;
  letter-spacing: 0.02em;
}

/* ── Topology Diagram ─────────────────────────── */
.hero-topo {
  display: flex; align-items: center; justify-content: center;
}
.topo-svg { width: 100%; max-width: 480px; height: auto; }

.topo-link {
  transition: stroke 0.4s ease;
}
.topo-svg:hover .topo-link {
  stroke: rgba(0, 212, 255, 0.3);
}

.topo-node { transition: transform 0.3s ease; }

@keyframes pulse-glow {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 1; }
}
.topo-core circle {
  filter: drop-shadow(0 0 6px rgba(0, 212, 255, 0.3));
}
.topo-hosts circle {
  animation: pulse-glow 3s ease-in-out infinite;
}
.topo-hosts circle:nth-child(even) { animation-delay: 1.5s; }

/* ── Shared Section ───────────────────────────── */
.section-title {
  font-size: clamp(1.6rem, 3vw, 2.4rem); font-weight: 700;
  color: var(--white); letter-spacing: -0.5px;
}
.section-sub {
  margin-top: 12px; color: var(--gray); font-size: 1.05rem;
  max-width: 560px; line-height: 1.7;
}

/* ── Expertise ────────────────────────────────── */
.expertise { padding: 120px 0; }
.expertise-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 20px; margin-top: 56px;
}

.card {
  position: relative; background: var(--dark-2);
  border: 1px solid var(--border); border-radius: 12px;
  padding: 36px 28px; overflow: hidden;
  transition: border-color var(--transition), transform var(--transition);
}
.card:hover { border-color: var(--border-hover); transform: translateY(-3px); }

.card-accent {
  position: absolute; top: 0; left: 28px; right: 28px; height: 1px;
  background: linear-gradient(90deg, transparent, var(--brand), transparent);
  opacity: 0; transition: opacity var(--transition);
}
.card:hover .card-accent { opacity: 1; }

.card h3 {
  font-size: 1.1rem; color: var(--white); margin-bottom: 12px;
  font-weight: 600;
}
.card p { color: var(--gray); font-size: 0.9rem; line-height: 1.7; }

.card-tags {
  display: flex; flex-wrap: wrap; gap: 6px;
  list-style: none; margin-top: 20px;
}
.card-tags li {
  padding: 3px 10px; font-size: 0.7rem; font-weight: 500;
  font-family: var(--font-mono);
  color: var(--brand); background: var(--brand-glow);
  border: 1px solid rgba(0, 212, 255, 0.12);
  border-radius: 3px; letter-spacing: 0.02em;
}

/* ── Practices ────────────────────────────────── */
.practices { padding: 120px 0; background: var(--dark-2); }
.practices-grid {
  display: grid; grid-template-columns: repeat(2, 1fr);
  gap: 24px; margin-top: 56px;
}

.practice {
  padding: 36px; border-radius: 12px;
  border: 1px solid var(--border);
  transition: border-color var(--transition);
}
.practice:hover { border-color: var(--border-hover); }

.practice-num {
  font-family: var(--font-mono); font-size: 0.8rem;
  font-weight: 600; color: var(--brand);
  margin-bottom: 16px; letter-spacing: 0.05em;
}
.practice h4 { font-size: 1.1rem; color: var(--white); margin-bottom: 10px; font-weight: 600; }
.practice p { color: var(--gray); font-size: 0.9rem; line-height: 1.7; }

/* ── About ────────────────────────────────────── */
.about { padding: 120px 0; }
.about-inner { display: grid; grid-template-columns: 1.4fr 1fr; gap: 72px; align-items: start; }
.about-text p {
  margin-top: 16px; color: var(--gray); line-height: 1.8; font-size: 0.95rem;
}

.about-numbers { display: flex; flex-direction: column; gap: 20px; margin-top: 8px; }

.stat {
  padding: 28px 32px; border-radius: 12px;
  background: var(--dark-2); border: 1px solid var(--border);
}
.stat-number {
  display: block; font-size: 1.8rem; font-weight: 800;
  color: var(--brand); letter-spacing: -0.5px;
  font-family: var(--font-mono);
}
.stat-label { color: var(--gray); font-size: 0.85rem; margin-top: 4px; }

/* ── Contact ──────────────────────────────────── */
.contact { padding: 120px 0; }
.contact-form { max-width: 680px; margin-top: 48px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.form-group { margin-bottom: 20px; }
.form-group label {
  display: block; margin-bottom: 6px; font-size: 0.8rem;
  color: var(--gray); font-weight: 500; letter-spacing: 0.02em;
}
.form-group input,
.form-group textarea,
.form-group select {
  width: 100%; padding: 12px 16px;
  background: var(--dark-2); border: 1px solid var(--border);
  border-radius: var(--radius); color: var(--white);
  font-family: inherit; font-size: 0.9rem;
  transition: border-color var(--transition);
}
.form-group select { cursor: pointer; }
.form-group select option { background: var(--dark-2); }
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none; border-color: var(--brand);
  box-shadow: 0 0 0 3px var(--brand-glow);
}
.form-group textarea { resize: vertical; }
.form-group textarea::placeholder { color: var(--gray); opacity: 0.5; }

/* ── Footer ───────────────────────────────────── */
.footer {
  padding: 48px 0 0;
  border-top: 1px solid var(--border);
  background: var(--dark-2);
}
.footer-inner {
  display: flex; align-items: start; justify-content: space-between;
  padding-bottom: 32px;
}
.footer-left p {
  font-size: 0.85rem; color: var(--gray); margin-top: 8px; max-width: 340px;
}
.footer-links { display: flex; gap: 28px; list-style: none; }
.footer-links a {
  font-size: 0.85rem; color: var(--gray); transition: color var(--transition);
}
.footer-links a:hover { color: var(--white); }

.footer-bottom {
  padding: 20px 0; border-top: 1px solid var(--border);
  font-size: 0.8rem; color: rgba(122, 133, 153, 0.6);
}

/* ── Animations ───────────────────────────────── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}
.fade-up {
  opacity: 0; transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-up.visible { opacity: 1; transform: translateY(0); }

/* ── Mobile ───────────────────────────────────── */
@media (max-width: 900px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-topo { margin-top: 24px; }
  .topo-svg { max-width: 400px; }
  .expertise-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .nav-toggle { display: flex; }
  .nav-links {
    position: fixed; top: 72px; left: 0; right: 0;
    background: var(--dark); flex-direction: column;
    padding: 24px; gap: 20px;
    border-bottom: 1px solid var(--border);
    transform: translateY(-120%); transition: transform 0.3s ease;
  }
  .nav-links.open { transform: translateY(0); }

  .expertise-grid { grid-template-columns: 1fr; }
  .practices-grid { grid-template-columns: 1fr; }
  .about-inner { grid-template-columns: 1fr; gap: 48px; }
  .form-row { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; gap: 24px; }
}