.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  border: 0;
  border-radius: 999px;
  padding: 0.75rem 1.2rem;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  transition: transform var(--transition), background var(--transition), color var(--transition);
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--color-bright);
  color: var(--color-deep-green);
}

.btn-primary:hover {
  color: var(--color-deep-green);
}

.btn-secondary {
  background: transparent;
  color: var(--color-white);
  border: 1px solid rgba(255, 255, 255, 0.5);
}

.btn-secondary:hover {
  color: var(--color-white);
  background: rgba(255, 255, 255, 0.08);
}

.btn-ghost {
  background: var(--color-white);
  color: var(--color-forest);
  border: 1px solid var(--color-line);
}

.btn-ghost:hover {
  color: var(--color-forest);
}

.hero {
  position: relative;
  overflow: hidden;
  background: linear-gradient(160deg, var(--color-deep-green) 0%, #0b4a32 58%, var(--color-teal) 100%);
  color: var(--color-white);
  padding: 5.5rem 0 4.5rem;
}

.hero h1 {
  color: var(--color-white);
  max-width: 16ch;
}

.hero p {
  max-width: 42rem;
  color: #d9f5e7;
  font-size: 1.15rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.hero-art {
  position: absolute;
  right: -4rem;
  bottom: -3rem;
  width: min(42vw, 28rem);
  height: min(42vw, 28rem);
  border-radius: 50%;
  background:
    radial-gradient(circle at 30% 30%, rgba(34, 197, 94, 0.35), transparent 45%),
    radial-gradient(circle at 70% 60%, rgba(15, 118, 110, 0.4), transparent 50%);
  pointer-events: none;
}

.growth-shape {
  position: absolute;
  inset: auto 8% 12% auto;
  width: min(36vw, 22rem);
  height: 10rem;
  pointer-events: none;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-5);
}

.flip-card {
  perspective: 1200px;
  min-height: 20rem;
}

.flip-inner {
  position: relative;
  width: 100%;
  height: 100%;
  min-height: 20rem;
  transform-style: preserve-3d;
  transition: transform 0.55s ease;
}

.flip-card.is-flipped .flip-inner,
.flip-card:hover .flip-inner {
  transform: rotateY(180deg);
}

@media (hover: hover) and (pointer: fine) {
  .flip-card:hover .flip-inner {
    transform: rotateY(180deg);
  }
}

@media (hover: none), (pointer: coarse) {
  .flip-card:hover .flip-inner {
    transform: none;
  }

  .flip-card.is-flipped .flip-inner {
    transform: rotateY(180deg);
  }
}

@media (prefers-reduced-motion: reduce) {
  .flip-inner {
    transform: none !important;
    min-height: auto;
  }

  .flip-face {
    position: relative;
    transform: none !important;
  }

  .flip-back {
    display: none;
    margin-top: 0.75rem;
  }

  .flip-card.is-flipped .flip-back,
  .flip-card:focus-within .flip-back {
    display: flex;
  }
}

.flip-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: var(--radius-lg);
  padding: 1.4rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
}

.flip-front {
  background: var(--color-white);
  border: 1px solid var(--color-line);
}

.flip-back {
  background: var(--color-deep-green);
  color: #e7f5ef;
  transform: rotateY(180deg);
}

.flip-back h3,
.flip-back p {
  color: inherit;
}

.flip-icon {
  width: 2.6rem;
  height: 2.6rem;
  margin-bottom: var(--space-3);
}

.flip-cue {
  margin-top: auto;
  font-size: 0.85rem;
  color: var(--color-teal);
  font-weight: 600;
  background: transparent;
  border: 0;
  padding: 0;
  text-align: left;
  cursor: pointer;
}

.flip-back .flip-cue {
  color: #b7f0c8;
}

.calc-panel .btn-secondary {
  background: var(--color-teal);
  color: var(--color-white);
  border: 0;
}

.benefit-card,
.step-card,
.plain-card {
  background: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  padding: 1.4rem;
  box-shadow: var(--shadow-sm);
}

.step-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
}

.step-number {
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background: var(--color-bright);
  color: var(--color-deep-green);
  display: grid;
  place-items: center;
  font-weight: 800;
  margin-bottom: var(--space-3);
}

.form-grid {
  display: grid;
  gap: var(--space-4);
}

.form-field label {
  display: block;
  font-weight: 650;
  margin-bottom: 0.35rem;
}

.form-field input,
.form-field select,
.form-field textarea {
  width: 100%;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  padding: 0.7rem 0.8rem;
  background: var(--color-white);
}

.form-note,
.form-error {
  font-size: 0.925rem;
}

.form-error {
  color: var(--color-danger);
}

.contact-split {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: var(--space-6);
  align-items: start;
}

.notice {
  background: var(--color-mint);
  border-left: 4px solid var(--color-teal);
  padding: 1rem 1.1rem;
  border-radius: var(--radius-sm);
}