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

body {
  font-family: 'Inter', sans-serif;
  background: #fff;
  color: #1a1a1a;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  text-decoration: none;
}
/* ─────────────────────────────
   DESKTOP HEADER
───────────────────────────── */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 80px;
  width: 100%;
}

.logo-tagline {
  display: flex;
  align-items: center;
  gap: 16px;
}

.logo {
  font-size: 24px;
  font-weight: 800;
  white-space: nowrap;
}

.logo .i    { color: #005fb8; }
.logo .struct { color: #1f2937; }

.logo-divider {
  width: 1px;
  height: 16px;
  background: #e5e7eb;
}

.tagline {
  font-size: 13px;
  font-weight: 400;
  color: #8a8a8a;
  white-space: nowrap;
}

.nav-auth {
  display: flex;
  align-items: center;
  gap: 40px;
}

.nav-links {
  display: flex;
  gap: 24px;
}

.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: #323130;
  white-space: nowrap;
}

.nav-links a:hover { color: #005fb8; }

.login-btn {
  display: inline-flex;
  align-items: center;
  padding: 8px 16px;
  border: 1px solid #d2d2d2;
  border-radius: 2px;
  font-size: 14px;
  font-weight: 600;
  color: #323130;
  white-space: nowrap;
}

.login-btn:hover { background: #f5f5f5; }

/* ─────────────────────────────
   DESKTOP HERO
───────────────────────────── */
.hero {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 64px 80px;
  width: 100%;
  min-height: 460px;
}

.hero-text {
  display: flex;
  flex-direction: column;
  gap: 24px;
  max-width: 580px;
}

.hero-logo {
  font-size: 30px;
  font-weight: 800;
  line-height: 36px;
}

.hero-logo .i     { color: #005fb8; }
.hero-logo .struct { color: #1f2937; }

.hero-desc {
  font-size: 30px;
  font-weight: 700;
  color: #8a8a8a;
  line-height: 1.5;
}

.hero-desc p + p { margin-top: 0; }

.cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #005fb8;
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  font-family: 'Inter', sans-serif;
  padding: 12px 24px 12px 28px;
  border-radius: 2px;
  white-space: nowrap;
}

.cta-btn:hover { background: #0050a0; }

.hero-image {
  flex-shrink: 0;
  width: 716px;
  height: 280px;
  overflow: hidden;
  border-radius: 4px;
}

.hero-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* ─────────────────────────────
   DESKTOP FEATURES
───────────────────────────── */
.features {
  display: flex;
  gap: 40px;
  align-items: flex-start;
  padding: 64px 80px;
  background: #fff;
  width: 100%;
}

.feature {
  display: flex;
  flex-direction: column;
  gap: 16px;
  flex: 1 0 0;
  min-width: 0;
}

.feature-title {
  font-size: 16px;
  font-weight: 700;
  color: #1f2937;
  line-height: 1.4;
}

.feature-desc {
  font-size: 14px;
  font-weight: 400;
  color: #6b7280;
  line-height: 20px;
}

.feature-desc p + p { margin-top: 4px; }

/* ─────────────────────────────
   DESKTOP FOOTER
───────────────────────────── */
.footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 32px 80px;
  width: 100%;
  border-top: 1px solid #e5e7eb;
  margin-top: auto;
}

.footer-copy {
  font-size: 12px;
  font-weight: 400;
  color: #8a8a8a;
  white-space: nowrap;
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  font-size: 12px;
  font-weight: 400;
  color: #8a8a8a;
  white-space: nowrap;
}

.footer-links a:hover { color: #005fb8; }

/* ─────────────────────────────
   MOBILE — hidden on desktop
───────────────────────────── */
.mobile-header,
.mobile-hero,
.mobile-features,
.mobile-footer {
  display: none;
}

/* ─────────────────────────────
   MOBILE BREAKPOINT ≤ 768px
───────────────────────────── */
@media (max-width: 768px) {

  .header,
  .hero,
  .features,
  .footer {
    display: none;
  }

  /* Mobile header */
  .mobile-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px;
    width: 100%;
    border-bottom: 1px solid #e5e7eb;
  }

  .mobile-logo-text {
    font-size: 20px;
    font-weight: 800;
    line-height: 1;
  }

  .mobile-logo-text .i      { color: #005fb8; }
  .mobile-logo-text .struct  { color: #1f2937; }

  .mobile-tagline {
    font-size: 10px;
    font-weight: 400;
    color: #8a8a8a;
    line-height: 12px;
    margin-top: 2px;
  }

  .hamburger {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 4px;
    cursor: pointer;
  }

  .hamburger span {
    display: block;
    width: 20px;
    height: 2px;
    background: #1a1a1a;
    border-radius: 1px;
  }

  /* Mobile hero */
  .mobile-hero {
    display: flex;
    flex-direction: column;
    gap: 24px;
    padding: 32px 16px;
    width: 100%;
  }

  .mobile-hero-logo {
    font-size: 28px;
    font-weight: 800;
    line-height: 34px;
  }

  .mobile-hero-logo .i      { color: #005fb8; }
  .mobile-hero-logo .struct  { color: #1f2937; }

  .mobile-hero-desc {
    font-size: 14px;
    font-weight: 500;
    color: #6b7280;
    line-height: 20px;
    margin-top: 16px;
  }

  .mobile-mindmap {
    width: 100%;
    height: 140px;
    overflow: hidden;
  }

  .mobile-mindmap img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
  }

  .mobile-cta {
    display: flex;
    align-items: center;
    justify-content: center;
    background: #005fb8;
    color: #fff;
    font-size: 14px;
    font-weight: 600;
    font-family: 'Inter', sans-serif;
    padding: 12px 24px;
    border-radius: 2px;
    width: 100%;
  }

  .mobile-cta:hover { background: #0050a0; }

  /* Mobile features */
  .mobile-features {
    display: flex;
    flex-direction: column;
    gap: 28px;
    padding: 40px 16px;
    background: #fff;
    width: 100%;
  }

  .mobile-feature {
    display: flex;
    flex-direction: column;
    gap: 8px;
    width: 100%;
  }

  /* Mobile footer */
  .mobile-footer {
    display: flex;
    flex-direction: column;
    gap: 20px;
    padding: 32px 16px;
    width: 100%;
    border-top: 1px solid #e5e7eb;
    margin-top: auto;
  }

  .mobile-footer-links {
    display: flex;
    gap: 16px;
    justify-content: center;
    width: 100%;
  }

  .mobile-footer-links a {
    font-size: 12px;
    font-weight: 400;
    color: #8a8a8a;
  }

  .mobile-footer-links a:hover { color: #005fb8; }

  .mobile-footer-copy {
    font-size: 12px;
    font-weight: 400;
    color: #8a8a8a;
    text-align: center;
    width: 100%;
  }
}