/* SecondBrain XL – Static Site
   Palette locked: #0A0A0A | #F5F5F0 | #FFFFFF | #2563EB
*/

:root {
  --black: #0A0A0A;
  --paper: #F5F5F0;
  --white: #FFFFFF;
  --blue: #2563EB;
  --gray: #6B7280;
  --gray-light: #9CA3AF;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--paper);
  color: var(--black);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* Typography */
h1, h2, h3, h4 {
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
}

h1 { font-size: clamp(2.25rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.75rem, 3vw, 2.25rem); }
h3 { font-size: 1.25rem; }

p {
  font-size: 1.0625rem;
  color: var(--black);
  max-width: 38rem;
}

a {
  color: var(--blue);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* Layout */
.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 4.5rem 0;
}

.section-dark {
  background: var(--black);
  color: var(--white);
}

.section-dark p {
  color: var(--gray-light);
}

/* Header */
.site-header {
  background: var(--black);
  color: var(--white);
  padding: 1.25rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--white);
  font-weight: 700;
  font-size: 1.125rem;
  letter-spacing: -0.01em;
}

.logo:hover {
  text-decoration: none;
}

.logo-mark {
  width: 36px;
  height: 36px;
  background: var(--blue);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 800;
  color: white;
}

.nav {
  display: flex;
  gap: 1.75rem;
  align-items: center;
}

.nav a {
  color: var(--gray-light);
  font-size: 0.9375rem;
  font-weight: 500;
}

.nav a:hover {
  color: var(--white);
  text-decoration: none;
}

.nav .btn {
  color: var(--white);
}

/* Buttons */
.btn {
  display: inline-block;
  background: var(--blue);
  color: var(--white);
  font-weight: 600;
  font-size: 0.9375rem;
  padding: 0.75rem 1.5rem;
  border-radius: 4px;
  border: none;
  cursor: pointer;
  transition: background 0.15s ease;
}

.btn:hover {
  background: #1d4ed8;
  text-decoration: none;
  color: var(--white);
}

.btn-outline {
  background: transparent;
  border: 1.5px solid var(--blue);
  color: var(--blue);
}

.btn-outline:hover {
  background: var(--blue);
  color: var(--white);
}

.btn-white {
  background: var(--white);
  color: var(--black);
}

.btn-white:hover {
  background: var(--paper);
  color: var(--black);
}

.btn-large {
  padding: 1rem 2rem;
  font-size: 1.0625rem;
}

/* Hero */
.hero {
  background: var(--black);
  color: var(--white);
  padding: 5.5rem 0 5rem;
}

.hero h1 {
  margin-bottom: 1.25rem;
  max-width: 18ch;
}

.hero .subhead {
  font-size: 1.25rem;
  color: var(--gray-light);
  margin-bottom: 2rem;
  max-width: 36rem;
  line-height: 1.45;
}

.hero-ctas {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

/* Cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-top: 2.5rem;
}

.card {
  background: var(--white);
  border: 1px solid #e5e5e0;
  border-radius: 6px;
  padding: 1.75rem;
}

.card h3 {
  margin-bottom: 0.5rem;
}

.card p {
  font-size: 0.975rem;
  color: var(--gray);
  margin-bottom: 1.25rem;
}

.price {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--black);
  margin-bottom: 1rem;
}

/* Offer page specific */
.offer-hero {
  background: var(--black);
  color: var(--white);
  padding: 4.5rem 0 4rem;
  text-align: center;
}

.offer-hero h1 {
  margin-bottom: 1rem;
  max-width: 20ch;
  margin-left: auto;
  margin-right: auto;
}

.offer-hero .subhead {
  font-size: 1.2rem;
  color: var(--gray-light);
  max-width: 34rem;
  margin: 0 auto 2rem;
}

.offer-price {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
}

.offer-price span {
  font-size: 1rem;
  font-weight: 500;
  color: var(--gray-light);
}

.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 2rem;
  margin-top: 2.5rem;
}

.step-num {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--blue);
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
}

.included-list {
  list-style: none;
  margin: 1.5rem 0;
}

.included-list li {
  padding: 0.6rem 0;
  border-bottom: 1px solid #e5e5e0;
  font-size: 1.02rem;
}

.included-list li:last-child {
  border-bottom: none;
}

.not-list {
  list-style: none;
}

.not-list li {
  padding: 0.45rem 0;
  color: var(--gray);
  font-size: 0.975rem;
}

.not-list li::before {
  content: "– ";
  color: var(--gray-light);
}

/* Footer */
.site-footer {
  background: var(--black);
  color: var(--gray-light);
  padding: 3rem 0 2rem;
  font-size: 0.9rem;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 2rem;
}

.footer-links {
  display: flex;
  gap: 1.5rem;
}

.footer-links a {
  color: var(--gray-light);
}

.footer-links a:hover {
  color: var(--white);
}

/* Utility */
.text-center { text-align: center; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2.5rem; }

.max-w {
  max-width: 40rem;
  margin-left: auto;
  margin-right: auto;
}

/* Responsive */
@media (max-width: 700px) {
  .nav {
    display: none;
  }
  .hero {
    padding: 3.5rem 0 3rem;
  }
  .section {
    padding: 3rem 0;
  }
  .offer-hero {
    padding: 3.5rem 0 3rem;
  }
}