:root {
  --ppau-green: #0f766e;
  --ppau-green-dark: #115e59;
  --ppau-teal: #14b8a6;
  --ppau-ink: #0f172a;
}

body {
  font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  color: var(--ppau-ink);
  background: #f6f9f9;
}

.main-nav {
  background: linear-gradient(90deg, var(--ppau-green-dark), var(--ppau-green));
  box-shadow: 0 2px 10px rgba(15, 23, 42, .15);
}

.main-nav .nav-link { font-weight: 500; color: rgba(255,255,255,.85); }
.main-nav .nav-link:hover { color: #fff; }
.main-nav .nav-link.active { color: #fff; font-weight: 700; }

.brand-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: #fff;
  color: var(--ppau-green);
  font-size: 1.2rem;
}

.hero {
  background:
    radial-gradient(circle at 85% 20%, rgba(20,184,166,.35), transparent 45%),
    linear-gradient(135deg, var(--ppau-ink) 0%, #134e4a 100%);
}

.hero-card {
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.15);
  border-radius: 20px;
  backdrop-filter: blur(6px);
}

.stat-tile {
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.12);
  border-radius: 16px;
  padding: 1rem;
}

.page-header {
  background: linear-gradient(90deg, var(--ppau-green-dark), var(--ppau-green));
  color: #fff;
}

.style-card { border: 0; border-radius: 16px; box-shadow: 0 4px 18px rgba(15,23,42,.06); transition: transform .15s ease, box-shadow .15s ease; }
.style-card:hover { transform: translateY(-4px); box-shadow: 0 10px 26px rgba(15,23,42,.12); }

.style-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: #fff;
  background: linear-gradient(135deg, var(--ppau-teal), var(--ppau-green));
}

.style-icon-sm {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  color: var(--ppau-green);
  background: rgba(20,184,166,.15);
}

.step-num {
  width: 46px;
  height: 46px;
  margin: 0 auto;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  color: #fff;
  background: linear-gradient(135deg, var(--ppau-teal), var(--ppau-green));
}

.auth-icon {
  width: 60px;
  height: 60px;
  border-radius: 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.7rem;
  color: #fff;
  background: linear-gradient(135deg, var(--ppau-teal), var(--ppau-green));
}

.auth-card { border: 0; border-radius: 18px; box-shadow: 0 8px 30px rgba(15,23,42,.08); }

.stat-card { border: 0; border-radius: 16px; box-shadow: 0 4px 18px rgba(15,23,42,.06); }
.stat-label { font-size: .8rem; text-transform: uppercase; letter-spacing: .04em; color: #64748b; font-weight: 600; }
.stat-value { font-size: 2rem; font-weight: 800; }
.stat-sub { font-size: .82rem; color: #64748b; }

.module-card { border: 0; border-radius: 16px; box-shadow: 0 4px 18px rgba(15,23,42,.06); transition: transform .15s ease, box-shadow .15s ease; }
.module-card:hover { transform: translateY(-4px); box-shadow: 0 10px 26px rgba(15,23,42,.12); }

.question-card { border: 0; border-radius: 14px; box-shadow: 0 2px 12px rgba(15,23,42,.05); }
.module-content h4 { font-weight: 700; margin-top: 1.2rem; }

.certificate {
  border: 2px solid #e2e8f0;
  border-radius: 18px;
  background: #fff;
}
.cert-name { color: var(--ppau-green-dark); }
.letter-spacing { letter-spacing: .22em; }

.site-footer { background: var(--ppau-ink); color: #fff; }

.btn-success { background: var(--ppau-green); border-color: var(--ppau-green); }
.btn-success:hover, .btn-success:focus { background: var(--ppau-green-dark); border-color: var(--ppau-green-dark); }

.card { border: 0; border-radius: 16px; box-shadow: 0 4px 18px rgba(15,23,42,.06); }
.card-header { background: #fff; border-bottom: 1px solid #eef2f6; border-radius: 16px 16px 0 0 !important; }
.card-body { border-radius: 16px; }

.table thead th { font-size: .78rem; text-transform: uppercase; letter-spacing: .03em; color: #64748b; }

@media print {
  .main-nav, .site-footer, .no-print, .btn { display: none !important; }
  body { background: #fff; }
  .certificate { border: 2px solid #0f172a; box-shadow: none; }
}