:root {
  --blue-900: #003d8f;
  --blue-700: #005ec4;
  --cyan-500: #00b8ff;
  --cyan-300: #62dcff;
  --white: #ffffff;
  --bg: #f3f9ff;
  --text: #0b2540;
  --muted: #4a6786;
  --border: #cfe6ff;
  --success: #0a9d63;
  --danger: #cc2d2d;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Be Vietnam Pro", system-ui, -apple-system, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

.container {
  width: min(1100px, 92vw);
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.95);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(8px);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
}

.logo {
  text-decoration: none;
  color: var(--blue-900);
  font-weight: 800;
  font-size: 1.6rem;
}

.nav-toggle {
  border: 1px solid var(--border);
  background: var(--white);
  color: var(--blue-900);
  border-radius: 10px;
  padding: 0.4rem 0.6rem;
}

.site-nav {
  display: none;
  position: absolute;
  top: 68px;
  left: 0;
  right: 0;
  background: var(--white);
  border-bottom: 1px solid var(--border);
  padding: 1rem 4vw;
}

.site-nav.open { display: grid; gap: 0.75rem; }
.site-nav a { color: var(--blue-900); text-decoration: none; font-weight: 600; }

.hero {
  background: linear-gradient(140deg, #eaf5ff 0%, #d9f5ff 45%, #f8fcff 100%);
  padding: 4rem 0 3.2rem;
}

.hero-grid {
  display: grid;
  gap: 1.5rem;
}

.tag {
  display: inline-block;
  margin-bottom: 0.8rem;
  background: #e2f2ff;
  color: var(--blue-900);
  border-radius: 999px;
  padding: 0.25rem 0.8rem;
  font-size: 0.9rem;
}

h1 {
  margin: 0;
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  line-height: 1.2;
}

h1 span { color: var(--blue-700); }
.subtitle { color: var(--muted); }

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  text-decoration: none;
  border-radius: 12px;
  padding: 0.65rem 1rem;
  font-weight: 700;
  border: none;
  cursor: pointer;
}

.btn-primary {
  background: linear-gradient(120deg, var(--blue-700), var(--cyan-500));
  color: var(--white);
}

.btn-ghost {
  background: var(--white);
  border: 1px solid var(--border);
  color: var(--blue-900);
}

.section {
  padding: 3rem 0;
}

.section-alt {
  background: var(--white);
}

.section h2 {
  margin-top: 0;
  font-size: clamp(1.4rem, 3vw, 2rem);
}

.section-sub { color: var(--muted); }

.cards {
  display: grid;
  gap: 1rem;
}

.card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1rem;
}

.steps {
  display: grid;
  gap: 1rem;
}

.step {
  background: #f6fbff;
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1rem;
}

.step span {
  display: inline-grid;
  place-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background: var(--cyan-500);
  color: var(--white);
  font-weight: 700;
}

.video-wrap video {
  width: 100%;
  border-radius: 16px;
  border: 1px solid var(--border);
  background: #000;
}

.calculator-grid {
  display: grid;
  gap: 1rem;
}

.calc-inputs {
  display: grid;
  gap: 0.5rem;
}

input, select, textarea {
  width: 100%;
  padding: 0.7rem;
  border-radius: 10px;
  border: 1px solid #bcdcff;
  font: inherit;
}

.calc-results {
  border-radius: 14px;
  border: 1px dashed var(--blue-700);
  padding: 1rem;
  background: #f6fbff;
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

.chips span {
  background: #e7f6ff;
  color: var(--blue-900);
  border-radius: 999px;
  padding: 0.45rem 0.8rem;
  font-weight: 600;
}

.form-grid {
  display: grid;
  gap: 0.8rem;
}

.auth-row {
  display: grid;
  gap: 0.8rem;
  margin-bottom: 0.8rem;
}

.auth-field {
  display: block;
}

.auth-row .btn {
  width: 100%;
}


.verification-status,
.form-status {
  font-weight: 600;
}

.verification-status.success,
.form-status.success { color: var(--success); }
.verification-status.error,
.form-status.error { color: var(--danger); }

.consent {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  margin: 1rem 0;
}

.consent input {
  width: auto;
  margin-top: 0.2rem;
}

.faq-list details {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.8rem 1rem;
  margin-bottom: 0.75rem;
}

.site-footer {
  background: #002f70;
  color: var(--white);
  padding: 1.2rem 0;
}

.footer-grid {
  display: flex;
  gap: 1rem;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
}

@media (min-width: 768px) {
  .nav-toggle { display: none; }
  .site-nav {
    display: flex;
    position: static;
    border: none;
    padding: 0;
    gap: 1rem;
    background: transparent;
  }
  .hero-grid,
  .calculator-grid {
    grid-template-columns: 1.3fr 1fr;
    align-items: start;
  }
  .three-col,
  .steps,
  .form-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .auth-row {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
  }

  .auth-row .btn {
    width: auto;
    min-width: 180px;
  }
  .form-grid label:nth-child(10),
  .form-grid label:nth-child(11),
  .form-grid label:nth-child(12),
  .form-grid label:nth-child(13),
  .form-grid label:nth-child(14),
  .form-grid label:nth-child(15),
  .form-grid label:nth-child(16) {
    grid-column: span 1;
  }
}

.hidden {
  display: none !important;
}

.validation-errors {
  margin: 0.6rem 0;
  padding-left: 1.2rem;
  color: var(--danger);
  font-weight: 600;
}

.success-box {
  margin-top: 1rem;
  border: 1px solid #bdeed8;
  background: #ecfff5;
  padding: 1rem;
  border-radius: 12px;
}

.success-box h3 {
  margin-top: 0;
  color: var(--success);
}