/* =========================================================================
   Landing page — full-page hero with formula background
   ========================================================================= */

/* Hero container: fills viewport below the header */
.landing-hero {
  position: relative;
  min-height: calc(100vh - 64px);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

/* Formula background — fills the entire hero */
.formula-background {
  position: absolute;
  inset: 0;
  pointer-events: none;
  user-select: none;
  z-index: 0;
}

.formula-background__inner {
  position: relative;
  width: 100%;
  height: 100%;
}

.formula {
  position: absolute;
  font-family: "JetBrains Mono", "Roboto Mono", "Fira Code", monospace;
  white-space: nowrap;
  font-size: 0.85rem;
  line-height: 1;
}

/* Light mode */
[data-md-color-scheme="default"] .formula {
  opacity: 0.06;
  color: #000;
}

/* Dark mode */
[data-md-color-scheme="slate"] .formula {
  opacity: 0.10;
  color: #fff;
}

/* Individual formula positions — scattered across the hero */
.formula--1  { top: 12%; left: 3%;  font-size: 0.9rem;  transform: rotate(-2deg); }
.formula--2  { top: 50%; left: 58%; font-size: 1.2rem;  transform: rotate(1deg); }
.formula--3  { top: 75%; left: 2%;  font-size: 0.75rem; transform: rotate(-1deg); }
.formula--4  { top: 28%; left: 42%; font-size: 0.85rem; transform: rotate(2deg); }
.formula--5  { top: 8%;  left: 65%; font-size: 0.8rem;  transform: rotate(-3deg); }
.formula--6  { top: 88%; left: 38%; font-size: 0.95rem; transform: rotate(1.5deg); }
.formula--7  { top: 42%; left: 8%;  font-size: 1.0rem;  transform: rotate(-0.5deg); }
.formula--8  { top: 5%;  left: 32%; font-size: 0.7rem;  transform: rotate(2.5deg); }
.formula--9  { top: 62%; left: 78%; font-size: 0.75rem; transform: rotate(-1.5deg); }
.formula--10 { top: 22%; left: 82%; font-size: 0.8rem;  transform: rotate(0.5deg); }
.formula--11 { top: 82%; left: 72%; font-size: 1.2rem;  transform: rotate(-2.5deg); }
.formula--12 { top: 38%; left: 55%; font-size: 0.7rem;  transform: rotate(1deg); }

/* =========================================================================
   Landing content — centered over the formula background
   ========================================================================= */

.landing-content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 2rem 1.5rem;
  max-width: 700px;
}

.landing-logo {
  width: 96px;
  height: 96px;
  margin-bottom: 1.5rem;
  border-radius: 16px;
}

.landing-title {
  font-size: 2.4rem;
  font-weight: 700;
  margin: 0 0 1rem;
  color: var(--md-default-fg-color);
}

.landing-tagline {
  font-size: 1.15rem;
  line-height: 1.6;
  margin: 0 0 2.5rem;
  opacity: 0.7;
  color: var(--md-default-fg-color);
}

.landing-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.landing-btn {
  display: inline-flex;
  align-items: center;
  padding: 0.75rem 1.75rem;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  transition: background-color 0.2s, color 0.2s, box-shadow 0.2s;
}

.landing-btn--primary {
  background-color: #ff9100;
  color: #fff;
}

.landing-btn--primary:hover {
  background-color: #e68200;
  box-shadow: 0 4px 12px rgba(255, 145, 0, 0.3);
}

.landing-btn--secondary {
  border: 2px solid var(--md-default-fg-color--lighter);
  color: var(--md-default-fg-color);
  background: transparent;
}

.landing-btn--secondary:hover {
  border-color: #ff9100;
  color: #ff9100;
}

/* =========================================================================
   Responsive
   ========================================================================= */

@media screen and (max-width: 76.25em) {
  .landing-title {
    font-size: 2rem;
  }

  .landing-tagline {
    font-size: 1rem;
  }
}

@media screen and (max-width: 600px) {
  .landing-hero {
    min-height: calc(100vh - 56px);
  }

  .landing-logo {
    width: 72px;
    height: 72px;
  }

  .landing-title {
    font-size: 1.6rem;
  }

  .landing-tagline {
    font-size: 0.9rem;
  }

  .landing-btn {
    padding: 0.65rem 1.25rem;
    font-size: 0.85rem;
  }

  /* Hide the longest formulas on small screens */
  .formula--1,
  .formula--3,
  .formula--5 {
    display: none;
  }

  .landing-features__grid {
    grid-template-columns: 1fr !important;
  }

  .landing-cta-card {
    padding: 1.5rem 1.25rem;
  }

  .landing-cta-card__title {
    font-size: 1.2rem;
  }
}

/* =========================================================================
   Features section — card grid below the hero
   ========================================================================= */

.landing-features {
  max-width: 960px;
  margin: 0 auto;
  padding: 3rem 1.5rem 2rem;
}

.landing-features__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

@media screen and (max-width: 76.25em) {
  .landing-features__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.feature-card {
  padding: 1.75rem;
  border-radius: 12px;
  border: 1px solid var(--md-default-fg-color--lightest);
  background: var(--md-default-bg-color);
  transition: border-color 0.2s, box-shadow 0.2s, transform 0.15s;
}

.feature-card:hover {
  border-color: #ff9100;
  box-shadow: 0 4px 20px rgba(255, 145, 0, 0.12);
  transform: translateY(-2px);
}

.feature-card__icon {
  font-size: 2rem;
  margin-bottom: 0.75rem;
}

.feature-card__title {
  font-size: 1.05rem;
  font-weight: 600;
  margin: 0 0 0.5rem;
  color: var(--md-default-fg-color);
}

.feature-card__desc {
  font-size: 0.88rem;
  line-height: 1.6;
  margin: 0;
  opacity: 0.7;
  color: var(--md-default-fg-color);
}

/* =========================================================================
   Interactive UI CTA card — contained card below features
   ========================================================================= */

.landing-cta-card {
  grid-column: 1 / -1;
  padding: 2rem 2.5rem;
  border-radius: 12px;
  border: 1px solid rgba(255, 145, 0, 0.2);
  border-left: 3px solid #ff9100;
  background: rgba(255, 145, 0, 0.04);
  text-align: center;
}

[data-md-color-scheme="slate"] .landing-cta-card {
  background: rgba(255, 145, 0, 0.06);
  border-color: rgba(255, 145, 0, 0.25);
  border-left-color: #ff9100;
}

.landing-cta-card__title {
  font-size: 1.4rem;
  font-weight: 700;
  margin: 0 0 0.5rem;
  color: var(--md-default-fg-color);
}

.landing-cta-card__desc {
  font-size: 0.95rem;
  line-height: 1.6;
  margin: 0 0 1.5rem;
  opacity: 0.7;
  color: var(--md-default-fg-color);
}