:root {
  --bg-gradient: radial-gradient(circle at 50% 0%, #f0fdf4 0%, #ffffff 100%);
  --nav-bg: rgba(255, 255, 255, 0.95);
  --red-strong: #dc2626; 
  --gray-strong: #64748b;
  --green-bg: #dcfce7;
  --green-border: #22c55e;
  --green-text: #14532d;
  --red-bg: #fee2e2;
  --red-border: #ef4444;
  --red-text: #991b1b;
  --yellow-bg: #fef9c3;
  --yellow-border: #eab308;
  --yellow-text: #713f12;
  --gray-bg: #f1f5f9;
  --gray-border: #94a3b8;
  --gray-text: #334155;
  --white-blue-bg: #ffffff;
  --white-blue-border: #3b82f6;
  --white-blue-text: #1e3a8a;
  --orange-bg: #ffedd5;
  --orange-border: #f97316;
  --orange-text: #7c2d12;
  --darkblue-bg: #e0f2fe;
  --darkblue-border: #0ea5e9;
  --darkblue-text: #0c4a6e;

  --shadow-soft: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --font-main: "Segoe UI", "Roboto", sans-serif;
}

body {
  margin: 0;
  background: var(--bg-gradient);
  font-family: var(--font-main);
  display: flex;
  flex-direction: column;
  align-items: center;
  color: #333;
  min-height: 100vh;
}

.top-nav {
  position: fixed;
  top: 0;
  width: 100%;
  background: var(--nav-bg);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid #e2e8f0;
  padding: 12px 30px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 1000;
  box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
  box-sizing: border-box;
}
.title-nav {
  font-weight: 700;
  font-size: 18px;
  display: flex;
  gap: 12px;
  align-items: center;
  color: #064e3b;
}
.btn-nav {
  background: white;
  border: 1px solid #e2e8f0;
  color: #64748b;
  padding: 8px 20px;
  border-radius: 30px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: 13px;
}
.btn-nav:hover {
  background: #10b981;
  color: white;
  border-color: #10b981;
}


.diagram-area {
  margin-top: 100px;
  margin-bottom: 60px;
  width: auto;
  position: relative;
  padding: 50px;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid #f1f5f9;
  border-radius: 24px;
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(20px);
  display: flex;
  justify-content: center;
}

.grid-container {
  display: grid;
  grid-template-columns: 140px 180px 180px 180px 180px;
  grid-template-rows: 110px 110px 110px 110px;
  gap: 30px;
  position: relative;
}

.box,
.circle {
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
  font-weight: 700;
  border-radius: 16px;
  box-shadow: var(--shadow-soft);
  font-size: 12px;
  padding: 10px;
  position: relative;
  z-index: 2;
  text-transform: uppercase;
  border-width: 2px;
  border-style: solid;
  background-color: white; /* Fallback */
}

.gray-gradient {
  background: linear-gradient(135deg, #f8fafc, #e2e8f0);
  border-color: var(--gray-border);
  color: var(--gray-text);
}
.green-box {
  background: var(--green-bg);
  border-color: var(--green-border);
  color: var(--green-text);
}
.red-box,
.red-full {
  background: var(--red-bg);
  border-color: var(--red-border);
  color: var(--red-text);
}
.yellow-box {
  background: var(--yellow-bg);
  border-color: var(--yellow-border);
  color: var(--yellow-text);
}
.gray-solid {
  background: var(--gray-bg);
  border-color: var(--gray-border);
  color: var(--gray-text);
}
.white-blue {
  background: var(--white-blue-bg);
  border-color: var(--white-blue-border);
  color: var(--white-blue-text);
}
.orange-box {
  background: var(--orange-bg);
  border-color: var(--orange-border);
  color: var(--orange-text);
}
.blue-dark {
  background: var(--darkblue-bg);
  border-color: var(--darkblue-border);
  color: var(--darkblue-text);
}
.circle {
  border-radius: 50%;
  width: 80px;
  height: 80px;
  justify-self: center;
}
.blue-circle {
  background: var(--white-blue-bg);
  border-color: var(--white-blue-border);
  color: var(--white-blue-text);
}
.red-circle {
  background: var(--red-bg);
  border-color: var(--red-border);
  color: var(--red-text);
}

.arrow-vertical,
.arrow-horizontal {
  font-size: 35px;
  font-weight: 900;
  color: #94a3b8;
  z-index: 1;
  pointer-events: none;
  display: flex;
  justify-content: center;
  align-items: center;
  opacity: 1;
}

.arrows-layer {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  pointer-events: none;
  overflow: visible;
}
 
@media (max-width: 1024px) {
  .grid-container {
    display: flex;
    flex-direction: column;
    gap: 40px;
  }
  .arrows-layer,
  .arrow-horizontal {
    display: none;
  }
  .arrow-vertical {
    display: block;
    height: 30px;
  }
  .box::after {
    content: "⬇";
    font-size: 24px;
    color: #cbd5e1;
    position: absolute;
    bottom: -35px;
  }
}
@media print {
  .top-nav {
    display: none;
  }
  .diagram-area {
    border: none;
    box-shadow: none;
  }
}