/* =========================
   HEADER
   ========================= */
   .site-header {
    background: var(--color-bg);
    border-bottom: 1px solid rgba(31, 79, 216, 0.08);
    position: sticky;
    top: 0;
    z-index: 100;
  }
  
  .header-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: var(--space-sm) var(--space-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
  }
  
  .logo {
    height: 48px;
  }
  
  .nav a {
    margin-left: var(--space-md);
    font-weight: 500;
  }
  
  /* =========================
     HERO
     ========================= */
  .hero {
    min-height: 90vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: var(--space-xl) var(--space-lg);
    gap: var(--space-md);
  }
  
  .hero h1 {
    font-size: 2.8rem;
    max-width: 900px;
  }
  
  .hero p {
    max-width: 700px;
    color: var(--color-text-muted);
    margin-bottom: var(--space-lg);
  }
  
  /* =========================
     SECTIONS (SPA STACK)
     ========================= */
  .section {
    padding: var(--space-xl) var(--space-lg);
    max-width: 900px;
    margin: 0 auto;
  }
  
  .section-light {
    background-color: var(--color-bg);
  }
  
  .section-muted {
    background-color: #F8FAFF;
  }
  
  .section-accent {
    background-color: var(--color-primary);
    color: white;
    text-align: center;
  }
  
  .section-accent h2,
  .section-accent p {
    color: white;
  }
  
  .section + .section {
    border-top: 1px solid rgba(31, 79, 216, 0.08);
  }
  
  /* =========================
     BUTTONS
     ========================= */
  .button-primary {
    display: inline-block;
    background-color: var(--color-primary);
    color: white;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    font-weight: 600;
    transition: all 0.2s ease;
  }
  
  .button-primary:hover {
    background-color: var(--color-accent);
    color: var(--color-text);
  }
  
  .button-invert {
    background-color: var(--color-accent);
    color: var(--color-text);
  }
  
  .button-invert:hover {
    background-color: white;
  }
  
  /* =========================
     FOOTER
     ========================= */
  .site-footer {
    padding: var(--space-lg);
    text-align: center;
    font-size: 0.85rem;
    color: var(--color-text-muted);
  }