* { box-sizing: border-box; }

:root {
  --bg: #07111f;
  --card: rgba(255, 255, 255, 0.075);
  --card-strong: rgba(255, 255, 255, 0.12);
  --text: #f4f8fb;
  --muted: #a9b8c6;
  --accent: #00d5ff;
  --accent-2: #4fffb0;
  --danger: #ffcc66;
  --border: rgba(255, 255, 255, 0.16);
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background:
    radial-gradient(circle at top left, rgba(0, 213, 255, 0.18), transparent 35%),
    radial-gradient(circle at top right, rgba(79, 255, 176, 0.12), transparent 35%),
    var(--bg);
  color: var(--text);
}

.hero { padding: 28px 6vw 60px; }

.navbar { display: flex; justify-content: space-between; align-items: center; gap: 16px; }
.brand { display: flex; align-items: center; gap: 14px; }

.logo {
  width: 52px; height: 52px; border-radius: 16px;
  display: grid; place-items: center;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #06111c; font-weight: 800;
  box-shadow: 0 0 28px rgba(0, 213, 255, 0.28);
}

.brand h1, .brand p { margin: 0; }
.brand p { color: var(--muted); font-size: 0.9rem; }

.nav-button, .primary-btn {
  border: none; border-radius: 999px; padding: 13px 20px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #06111c; font-weight: 800; text-decoration: none; cursor: pointer;
}

.hero-content {
  margin-top: 70px; display: grid; grid-template-columns: 1.5fr 0.8fr;
  gap: 32px; align-items: center;
}

.badge {
  display: inline-block; padding: 8px 13px; border: 1px solid var(--border);
  border-radius: 999px; color: var(--accent-2); background: rgba(255, 255, 255, 0.06);
}

.hero-content h2 {
  max-width: 850px; font-size: clamp(2.2rem, 5vw, 4.8rem);
  line-height: 1.02; margin: 20px 0;
}

.hero-content p { max-width: 720px; color: var(--muted); font-size: 1.1rem; }

.hero-card, .calculator-card, .sidebar, .content-section {
  border: 1px solid var(--border); background: var(--card); backdrop-filter: blur(18px);
  border-radius: 28px; box-shadow: 0 25px 80px rgba(0, 0, 0, 0.25);
}

.hero-card { padding: 28px; }
main { padding: 0 6vw 36px; }

.ad-zone {
  border: 1px dashed rgba(255,255,255,0.28); background: rgba(255,255,255,0.045);
  color: var(--muted); border-radius: 18px; display: grid; place-items: center; text-align: center;
}

.ad-top, .ad-bottom { min-height: 90px; margin: 20px 0; }

.app-layout {
  display: grid; grid-template-columns: 310px 1fr; gap: 22px; align-items: start;
}

.sidebar { padding: 20px; position: sticky; top: 16px; }

.module-btn {
  width: 100%; margin-bottom: 10px; padding: 14px; border-radius: 16px;
  border: 1px solid var(--border); background: rgba(255,255,255,0.06);
  color: var(--text); text-align: left; cursor: pointer;
}

.module-btn.active, .module-btn:hover {
  background: linear-gradient(135deg, rgba(0,213,255,0.22), rgba(79,255,176,0.16));
  border-color: var(--accent);
}

.ad-side { height: 260px; margin-top: 18px; }
.calculator-card { padding: 28px; }

.calculator-header { display: flex; justify-content: space-between; gap: 16px; margin-bottom: 22px; }
.calculator-header h2 { margin: 0 0 6px; }
.calculator-header p { margin: 0; color: var(--muted); }

.form-grid { display: grid; grid-template-columns: repeat(2, minmax(220px, 1fr)); gap: 16px; }
.input-group { display: grid; gap: 8px; }
.input-group label { color: var(--muted); font-size: 0.92rem; }

.input-group input, .input-group select {
  width: 100%; border: 1px solid var(--border); border-radius: 16px;
  padding: 14px 15px; background: rgba(0,0,0,0.22); color: var(--text); outline: none;
}

.input-group input:focus, .input-group select:focus {
  border-color: var(--accent); box-shadow: 0 0 0 3px rgba(0,213,255,0.12);
}

.primary-btn { margin-top: 22px; width: 100%; font-size: 1rem; }

.result-box, .steps-box {
  margin-top: 22px; padding: 22px; border-radius: 22px;
  border: 1px solid var(--border); background: var(--card-strong);
}

.result-label {
  margin: 0 0 6px; color: var(--accent-2); font-weight: 800;
  text-transform: uppercase; letter-spacing: 0.08em; font-size: 0.78rem;
}

.result-box h3 { margin: 0 0 14px; font-size: 2rem; color: var(--accent-2); }
.result-box ul, .steps-box ol { margin-bottom: 0; }
.warning { color: var(--danger); }
.hidden { display: none; }

.content-section { margin-top: 26px; padding: 28px; }
.content-section p { color: var(--muted); }

footer { padding: 26px; text-align: center; color: var(--muted); }

@media (max-width: 850px) {
  .navbar, .hero-content, .app-layout { grid-template-columns: 1fr; }
  .navbar { align-items: flex-start; }
  .hero-content { margin-top: 42px; }
  .form-grid { grid-template-columns: 1fr; }
  .sidebar { position: static; }
  .ad-side { height: 120px; }
}