/* ── Fertaro — Landing Page ─────────────────────────────── */
:root {
  --bg: #0b0b14;
  --surface: #111128;
  --card: #16163a;
  --accent: #4f8cff;
  --accent-glow: rgba(79, 140, 255, 0.15);
  --green: #34d399;
  --text: #d1d5db;
  --text-bright: #f3f4f6;
  --dim: #6b7280;
  --border: rgba(255, 255, 255, 0.06);
  --radius: 16px;
}

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

body {
  font-family: 'Inter', -apple-system, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ── NAV ──────────────────────────────────────────────────── */
.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 32px;
  max-width: 1200px;
  margin: 0 auto;
}

.logo {
  font-size: 20px;
  font-weight: 800;
  color: var(--text-bright);
  letter-spacing: -0.02em;
}

.logo span {
  color: var(--accent);
  font-weight: 400;
}

.nav-links {
  display: flex;
  gap: 28px;
  align-items: center;
}

.nav-links a {
  color: var(--dim);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: color 0.2s;
}

.nav-links a:hover { color: var(--text-bright); }

.btn-nav {
  background: var(--accent) !important;
  color: white !important;
  padding: 8px 20px;
  border-radius: 8px;
  font-weight: 600 !important;
}

/* ── HERO ─────────────────────────────────────────────────── */
.hero {
  min-height: 90vh;
  display: flex;
  flex-direction: column;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(79, 140, 255, 0.08), transparent 60%),
    radial-gradient(ellipse at 80% 20%, rgba(52, 211, 153, 0.05), transparent 50%),
    var(--bg);
}

.hero-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 60px 32px;
  max-width: 800px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-block;
  padding: 6px 16px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
  border: 1px solid rgba(79, 140, 255, 0.25);
  background: rgba(79, 140, 255, 0.08);
  margin-bottom: 24px;
}

.hero h1 {
  font-size: clamp(28px, 5vw, 48px);
  font-weight: 800;
  color: var(--text-bright);
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
}

.hero-sub {
  font-size: 18px;
  color: var(--dim);
  max-width: 600px;
  margin-bottom: 40px;
  line-height: 1.7;
}

.hero-stats {
  display: flex;
  gap: 40px;
  margin-bottom: 36px;
}

.stat { text-align: center; }
.stat-num { display: block; font-size: 28px; font-weight: 800; color: var(--green); }
.stat-label { font-size: 12px; color: var(--dim); text-transform: uppercase; letter-spacing: 0.05em; }

.btn-primary {
  display: inline-block;
  padding: 14px 32px;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 10px;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.15s, box-shadow 0.15s;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(79, 140, 255, 0.3);
}

/* ── PROBLEM ──────────────────────────────────────────────── */
.problem {
  padding: 80px 0;
  border-top: 1px solid var(--border);
}

.problem h2, .services h2, .tech h2, .case-study h2, .contact h2 {
  font-size: clamp(24px, 4vw, 36px);
  font-weight: 800;
  color: var(--text-bright);
  text-align: center;
  margin-bottom: 12px;
}

.section-sub {
  text-align: center;
  color: var(--dim);
  font-size: 16px;
  margin-bottom: 48px;
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

.problem-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
  margin-top: 40px;
}

.problem-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
}

.problem-icon { font-size: 28px; margin-bottom: 12px; }
.problem-card h3 { font-size: 18px; color: var(--text-bright); margin-bottom: 8px; font-weight: 700; }
.problem-card p { font-size: 14px; color: var(--dim); line-height: 1.6; }

/* ── SERVICES ─────────────────────────────────────────────── */
.services {
  padding: 80px 0;
  background: var(--surface);
  border-top: 1px solid var(--border);
}

.tier-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}

.tier-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 24px;
  position: relative;
}

.tier-card.featured {
  border-color: var(--accent);
  box-shadow: 0 0 40px rgba(79, 140, 255, 0.1);
}

.tier-badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  background: var(--accent-glow);
  color: var(--accent);
  margin-bottom: 16px;
}

.tier-card h3 { font-size: 20px; color: var(--text-bright); font-weight: 700; margin-bottom: 8px; }
.tier-price { font-size: 28px; font-weight: 800; color: var(--green); margin-bottom: 20px; }

.tier-card ul {
  list-style: none;
  margin-bottom: 16px;
}

.tier-card li {
  padding: 6px 0;
  font-size: 14px;
  color: var(--text);
  border-bottom: 1px solid rgba(255,255,255,0.03);
}

.tier-card li::before {
  content: "\2713 ";
  color: var(--green);
  font-weight: 700;
  margin-right: 8px;
}

.tier-example { font-size: 13px; color: var(--dim); font-style: italic; }

/* ── TECH ─────────────────────────────────────────────────── */
.tech {
  padding: 80px 0;
  border-top: 1px solid var(--border);
}

.arch-diagram {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  margin: 32px 0;
  overflow-x: auto;
}

.arch-diagram pre {
  color: var(--accent);
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 14px;
  line-height: 1.5;
  text-align: center;
  white-space: pre;
}

.tech-features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin-top: 32px;
}

.tech-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}

.tech-card h4 { font-size: 16px; color: var(--text-bright); margin-bottom: 8px; font-weight: 700; }
.tech-card p { font-size: 14px; color: var(--dim); line-height: 1.6; }

/* ── CASE STUDY ───────────────────────────────────────────── */
.case-study {
  padding: 80px 0;
  background: var(--surface);
  border-top: 1px solid var(--border);
}

.case-content { max-width: 680px; margin: 32px auto 0; }
.case-text p { margin-bottom: 16px; color: var(--text); }
.case-text ul { list-style: none; margin-top: 16px; }
.case-text li { padding: 8px 0; font-size: 15px; }
.case-text li::before { content: "\2192 "; color: var(--accent); font-weight: 700; }

/* ── CONTACT ──────────────────────────────────────────────── */
.contact {
  padding: 80px 0;
  border-top: 1px solid var(--border);
}

.contact-form {
  max-width: 520px;
  margin: 0 auto;
  display: grid;
  gap: 14px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 16px;
  color: var(--text-bright);
  font-size: 15px;
  font-family: inherit;
  outline: none;
  transition: border-color 0.2s;
}

.contact-form input:focus,
.contact-form textarea:focus { border-color: var(--accent); }
.contact-form textarea { resize: vertical; min-height: 80px; }

.form-status { text-align: center; font-size: 14px; min-height: 20px; }
.form-status.success { color: var(--green); }

/* ── FOOTER ───────────────────────────────────────────────── */
.footer {
  padding: 40px 0;
  border-top: 1px solid var(--border);
  text-align: center;
}

.footer-content p { font-size: 14px; color: var(--dim); margin-top: 8px; }
.footer-legal { font-size: 12px; margin-top: 12px; }

/* ── RESPONSIVE ───────────────────────────────────────────── */
@media (max-width: 640px) {
  .hero-stats { flex-direction: column; gap: 16px; }
  .form-row { grid-template-columns: 1fr; }
  .nav-links a:not(.btn-nav) { display: none; }
  .arch-diagram pre { font-size: 11px; }
}