:root {
  --bg-1: #f6efe6;
  --bg-2: #efe2d0;
  --paper: #fffaf2;
  --ink: #1d1a16;
  --muted: #6a6156;
  --accent: #0e7c66;
  --accent-2: #114b7a;
  --line: #dccfbf;
  --shadow: 0 18px 40px rgba(0, 0, 0, 0.12);
  --radius-lg: 24px;
  --radius-md: 14px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Sora", "Segoe UI", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 8% 10%, #fff7eb 0, transparent 28%),
    radial-gradient(circle at 92% 18%, #f0ddc5 0, transparent 30%),
    linear-gradient(160deg, var(--bg-1), var(--bg-2));
  min-height: 100vh;
}

.page-wrap {
  max-width: 1140px;
  margin: 0 auto;
  padding: 48px 20px 60px;
}

.hero {
  background: linear-gradient(145deg, #fff9f1, #f3e6d4);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  padding: 34px 30px;
  position: relative;
  overflow: hidden;
}

.hero::after {
  content: "";
  position: absolute;
  right: -100px;
  top: -80px;
  width: 260px;
  height: 260px;
  border-radius: 50%;
  background: rgba(17, 75, 122, 0.08);
}

h1,
h2,
h3 {
  margin-top: 0;
  letter-spacing: 0.02em;
  font-weight: 700;
}

h1 {
  font-size: clamp(2rem, 4.4vw, 3rem);
  margin-bottom: 12px;
}

h2 {
  font-size: clamp(1.35rem, 2.3vw, 1.7rem);
}

p {
  line-height: 1.62;
  color: var(--muted);
  margin-top: 0;
}

.lead {
  max-width: 70ch;
  margin-bottom: 0;
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 16px;
  margin-top: 24px;
}

.card {
  grid-column: span 6;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.08);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  animation: rise 520ms ease both;
}

.card:nth-child(2) {
  animation-delay: 60ms;
}

.card:nth-child(3) {
  animation-delay: 120ms;
}

.card:nth-child(4) {
  animation-delay: 180ms;
}

.button-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.btn {
  font-family: "Montserrat", "Segoe UI", sans-serif;
  text-decoration: none;
  border-radius: 999px;
  border: 1px solid transparent;
  padding: 10px 16px;
  font-size: 0.92rem;
  font-weight: 600;
  transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn:focus-visible {
  outline: 2px solid #1a8d75;
  outline-offset: 2px;
}

.btn-primary {
  background: linear-gradient(120deg, var(--accent), #1f9e84);
  color: #f9fffd;
  box-shadow: 0 10px 20px rgba(14, 124, 102, 0.27);
}

.btn-secondary {
  background: #f8efe2;
  color: var(--accent-2);
  border-color: #d6c2aa;
}

.back-link {
  margin: 0 0 18px;
}

.gallery {
  margin-top: 20px;
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 14px;
}

.diagram-item {
  grid-column: span 6;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 14px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

.diagram-item img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: contain;
  background: #f4ecdf;
  border-radius: 10px;
  border: 1px solid #d7c6b1;
}

.diagram-item h3 {
  font-family: "Montserrat", "Segoe UI", sans-serif;
  font-size: 1.02rem;
  margin: 12px 0 10px;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(12px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 880px) {
  .card,
  .diagram-item {
    grid-column: span 12;
  }
}

@media (max-width: 600px) {
  .page-wrap {
    padding: 24px 14px 40px;
  }

  .hero {
    padding: 24px 18px;
  }
}