:root {
  --ink: #0a0a0a;
  --paper: #f6f7f2;
  --green-deep: #056801;
  --green-core: #016403;
  --green-bright: #69ce64;
  --green-mid: #2b9227;
  --green-soft: #51b54c;
  --tone: #e0e6dc;
  --accent: #e9f5e6;
  --shadow: 0 18px 48px rgba(5, 104, 1, 0.18);
  --radius: 22px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Space Grotesk", "Quantico", sans-serif;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.6;
}

h1,
h2,
h3,
.nav-links a,
.btn {
  font-family: "Quantico", "Space Grotesk", sans-serif;
  letter-spacing: 0.02em;
}

img {
  max-width: 100%;
  display: block;
}

.container {
  width: min(1120px, 92vw);
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(246, 247, 242, 0.92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(5, 104, 1, 0.08);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 0;
}

.brand img {
  height: 64px;
}

.nav-links {
  display: flex;
  gap: 22px;
}

.nav-links a {
  text-decoration: none;
  color: var(--ink);
  font-size: 0.95rem;
}

.hero {
  position: relative;
  padding: 96px 0 120px;
  overflow: hidden;
}

.hero-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 48px;
  align-items: center;
}

.eyebrow {
  text-transform: uppercase;
  font-weight: 600;
  letter-spacing: 0.2em;
  font-size: 0.75rem;
  color: var(--green-mid);
}

.hero h1 {
  font-size: clamp(2.5rem, 4vw, 3.7rem);
  margin: 12px 0 18px;
}

.lead {
  font-size: 1.1rem;
  color: rgba(10, 10, 10, 0.8);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 26px;
}

.btn {
  border-radius: 999px;
  padding: 12px 22px;
  border: none;
  cursor: pointer;
  text-decoration: none;
  font-size: 0.95rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn.primary {
  background: var(--green-deep);
  color: white;
  box-shadow: var(--shadow);
}

.btn.ghost {
  background: transparent;
  border: 1px solid rgba(5, 104, 1, 0.25);
  color: var(--green-deep);
}

.btn.small {
  padding: 8px 16px;
  font-size: 0.85rem;
}

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

.hero-card {
  background: white;
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  border: 1px solid rgba(5, 104, 1, 0.08);
}

.hero-card-top {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 16px;
}

.tag {
  font-size: 0.75rem;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--accent);
  color: var(--green-deep);
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: 24px;
}

.stat {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--green-deep);
}

.stat-label {
  font-size: 0.8rem;
  color: rgba(10, 10, 10, 0.6);
}

.hero-glow {
  position: absolute;
  width: 460px;
  height: 460px;
  background: radial-gradient(circle, rgba(105, 206, 100, 0.35), transparent 70%);
  top: -120px;
  right: -80px;
  z-index: -1;
}

.section {
  padding: 90px 0;
}

.section.alt {
  background: var(--accent);
}

.section-title {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 20px;
  margin-bottom: 38px;
}

.section-title h2 {
  font-size: clamp(2rem, 3vw, 2.6rem);
  margin: 0;
}

.section-title p {
  max-width: 360px;
  color: rgba(10, 10, 10, 0.65);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 24px;
}

.card {
  background: white;
  border-radius: var(--radius);
  padding: 26px;
  border: 1px solid rgba(5, 104, 1, 0.08);
  box-shadow: 0 16px 30px rgba(5, 104, 1, 0.08);
}

.list {
  margin: 18px 0 0;
  padding-left: 18px;
  color: rgba(10, 10, 10, 0.75);
}

.configurator {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 28px;
}

.config-form {
  display: grid;
  gap: 14px;
}

.config-form label {
  display: grid;
  gap: 6px;
  font-weight: 500;
}

.config-form input {
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid rgba(5, 104, 1, 0.2);
  background: white;
  font-size: 0.95rem;
}

.config-output {
  background: white;
  border-radius: var(--radius);
  padding: 24px;
  border: 1px solid rgba(5, 104, 1, 0.12);
  box-shadow: var(--shadow);
}

.output-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.output-actions {
  display: flex;
  gap: 10px;
}

.helper {
  color: rgba(10, 10, 10, 0.65);
  margin-top: 6px;
}

.uart-status {
  font-size: 0.85rem;
  margin-top: 4px;
}

#payload {
  width: 100%;
  margin-top: 14px;
  border-radius: 12px;
  border: 1px solid rgba(5, 104, 1, 0.2);
  padding: 14px;
  font-family: "Space Grotesk", sans-serif;
  background: #f8fbf5;
  resize: none;
}

.preview {
  margin-top: 14px;
}

.preview-label {
  text-transform: uppercase;
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--green-mid);
  display: block;
  margin-bottom: 8px;
}

.preview-card {
  background: #f8fbf5;
  color: var(--ink);
  padding: 20px;
  border-radius: 12px;
  border: 1px solid rgba(5, 104, 1, 0.2);
  font-family: "Quantico", sans-serif;
  max-width: 740px;
  aspect-ratio: 296 / 128;
  width: 100%;
}

.preview-content {
  display: flex;
  gap: 24px;
  align-items: flex-start;
  justify-content: space-between;
  height: 100%;
}

.preview-text {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-width: 0;
}

.preview-name {
  font-size: 1.92rem;
  font-weight: 700;
  color: var(--ink);
  line-height: 1.1;
}

.preview-role,
.preview-company {
  font-size: 1.04rem;
  color: var(--ink);
  line-height: 1.2;
}

.preview-social-box {
  display: inline-block;
  background: var(--ink);
  padding: 6px 10px;
  margin-top: 8px;
  width: fit-content;
}

.preview-social {
  font-size: 1.04rem;
  color: #ffd700;
  font-weight: 700;
}

.preview-qr-box {
  width: 174px;
  height: 174px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.preview-qr-box img,
.preview-qr-box canvas {
  max-width: 100%;
  max-height: 100%;
}

.note {
  margin-top: 18px;
}

.note h4 {
  margin: 0 0 8px;
}

.timeline {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
}

.contact {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
  align-items: center;
}

.contact-card {
  background: white;
  border-radius: var(--radius);
  padding: 24px;
  border: 1px solid rgba(5, 104, 1, 0.12);
}

.contact-label {
  text-transform: uppercase;
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--green-mid);
  margin-bottom: 6px;
}

.contact-value {
  margin-top: 0;
  font-size: 1.05rem;
}

.site-footer {
  padding: 32px 0 50px;
  text-align: center;
  color: rgba(10, 10, 10, 0.65);
}

@media (max-width: 820px) {
  .nav {
    flex-direction: column;
    gap: 12px;
  }

  .nav-links {
    flex-wrap: wrap;
    justify-content: center;
  }

  .section-title {
    flex-direction: column;
    align-items: flex-start;
  }
}