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

:root {
  --accent: #1690fa;
  --accent-hover: #0a7ae6;
  --accent-light: #e8f4ff;
  --black: #000000;
  --white: #FFFFFF;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  --green-50: #f0fdf4;
  --green-500: #22c55e;
  --green-700: #15803d;
  --yellow-50: #fefce8;
  --yellow-600: #ca8a04;
  --yellow-700: #a16207;
  --red-50: #fef2f2;
  --red-600: #dc2626;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', sans-serif;
  color: var(--black);
  background: var(--white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ── NAV ── */
nav {
  background: rgba(0,0,0,0.95);
  backdrop-filter: blur(12px);
  padding: 16px 0;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.nav-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.nav-logo {
  font-size: 28px;
  font-weight: 800;
  color: var(--white);
  text-decoration: none;
  letter-spacing: -0.5px;
}
.nav-logo span {
  color: var(--accent);
}

/* ── HERO ── */
.hero {
  padding: 28px 24px 20px;
  text-align: center;
  background: linear-gradient(180deg, #f0f7ff 0%, var(--white) 100%);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(22,144,250,0.06) 0%, transparent 70%);
  pointer-events: none;
}
.hero .section-label {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 10px;
}
.hero h1 {
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -0.03em;
  max-width: 700px;
  margin: 0 auto 10px;
  color: var(--gray-900);
}
.hero p {
  font-size: clamp(16px, 2vw, 19px);
  color: var(--gray-600);
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.6;
}

/* ── CONTENT ── */
.content {
  max-width: 720px;
  margin: 0 auto;
  padding: 24px 24px 80px;
}

/* ── STEP CARDS ── */
.step {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: 16px;
  padding: 32px;
  margin-bottom: 24px;
  position: relative;
}
.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--accent);
  color: var(--white);
  font-weight: 800;
  font-size: 16px;
  border-radius: 10px;
  margin-bottom: 16px;
}
.step h2 {
  font-size: 22px;
  font-weight: 800;
  color: var(--gray-900);
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}
.step p, .step li {
  font-size: 16px;
  color: var(--gray-600);
  line-height: 1.7;
}
.step ol, .step ul {
  padding-left: 20px;
  margin: 12px 0;
}
.step li {
  margin-bottom: 8px;
}
.step a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
}
.step a:hover {
  text-decoration: underline;
}

/* ── CALLOUT BOXES ── */
.callout {
  padding: 16px 20px;
  border-radius: 10px;
  margin: 16px 0;
  font-size: 15px;
  line-height: 1.6;
}
.callout strong {
  display: block;
  margin-bottom: 4px;
}
.callout-warning {
  background: var(--yellow-50);
  border: 1px solid #fde68a;
  color: var(--yellow-700);
}
.callout-warning strong {
  color: var(--yellow-600);
}
.callout-info {
  background: var(--accent-light);
  border: 1px solid #bfdbfe;
  color: #1e40af;
}
.callout-success {
  background: var(--green-50);
  border: 1px solid #bbf7d0;
  color: var(--green-700);
}
.callout-note {
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  color: var(--gray-600);
}
.callout-note strong {
  color: var(--gray-800);
}

/* ── CREDENTIAL FORM ── */
.credentials-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 16px 0;
}
.credential-field label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--gray-700);
  margin-bottom: 6px;
}
.credential-field input {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--gray-200);
  border-radius: 8px;
  font-family: 'Inter', sans-serif;
  font-size: 15px;
  color: var(--gray-900);
  background: var(--gray-50);
  transition: border-color 0.2s;
}
.credential-field input:focus {
  outline: none;
  border-color: var(--accent);
  background: var(--white);
}

/* ── DIVIDER ── */
.divider {
  height: 1px;
  background: var(--gray-200);
  margin: 40px 0;
}

/* ── INFO SECTION ── */
.info-section {
  margin-top: 48px;
}
.info-section h2 {
  font-size: 24px;
  font-weight: 800;
  color: var(--gray-900);
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}
.info-section h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--gray-800);
  margin: 24px 0 12px;
}
.info-section p, .info-section li {
  font-size: 16px;
  color: var(--gray-600);
  line-height: 1.7;
}
.info-section ul {
  padding-left: 20px;
  margin: 12px 0;
}
.info-section li {
  margin-bottom: 8px;
}

/* ── FEATURE LIST ── */
.feature-list {
  list-style: none;
  padding: 0;
  margin: 16px 0;
}
.feature-list li {
  padding: 10px 0 10px 32px;
  position: relative;
  border-bottom: 1px solid var(--gray-100);
}
.feature-list li:last-child {
  border-bottom: none;
}
.feature-list li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--green-500);
  font-weight: 700;
  font-size: 16px;
}

/* ── FOOTER ── */
footer {
  background: var(--black);
  color: var(--gray-400);
  text-align: center;
  padding: 28px 24px;
  font-size: 13px;
  border-top: 1px solid rgba(255,255,255,0.06);
}

/* ── PLACEHOLDER PAGE ── */
.placeholder-content {
  text-align: center;
  padding: 80px 24px 120px;
}
.placeholder-content .icon {
  font-size: 48px;
  margin-bottom: 24px;
}
.placeholder-content h2 {
  font-size: 24px;
  font-weight: 800;
  color: var(--gray-900);
  margin-bottom: 12px;
}
.placeholder-content p {
  font-size: 17px;
  color: var(--gray-500);
  max-width: 480px;
  margin: 0 auto;
}

/* ── RESPONSIVE ── */
@media (max-width: 640px) {
  .hero { padding: 20px 24px 16px; }
  .step { padding: 24px; }
  .credentials-grid { grid-template-columns: 1fr; }
}