:root {
  --bg: #0a0c10;
  --bg-surface: #12151c;
  --bg-card: #181c26;
  --accent: #00e5a0;
  --accent-dim: #00b37d;
  --accent-glow: rgba(0, 229, 160, 0.15);
  --accent-glow-strong: rgba(0, 229, 160, 0.35);
  --text: #e4e8f1;
  --text-dim: #8892a8;
  --text-muted: #5a6378;
  --border: #1e2433;
  --warning: #ff6b3d;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: 'Outfit', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
}

/* ─── MESH CANVAS ─── */
#mesh-bg {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  z-index: 0;
  opacity: 0.4;
}

/* ─── NAV ─── */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 1rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(10, 12, 16, 0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.nav-logo {
  font-family: 'Space Mono', monospace;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--accent);
  letter-spacing: 2px;
  text-transform: uppercase;
  text-decoration: none;
}
.nav-logo span { color: var(--text-dim); font-weight: 400; }

.nav-links { display: flex; gap: 2rem; align-items: center; }
.nav-links a {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.5px;
  transition: color 0.3s;
}
.nav-links a:hover { color: var(--accent); }

.nav-cta {
  background: var(--accent) !important;
  color: var(--bg) !important;
  padding: 0.5rem 1.2rem;
  border-radius: 6px;
  font-weight: 600 !important;
  transition: transform 0.2s, box-shadow 0.3s !important;
}
.nav-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 20px var(--accent-glow-strong);
}

/* ─── HERO ─── */
.hero {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 8rem 2rem 4rem;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--accent-glow);
  border: 1px solid rgba(0, 229, 160, 0.25);
  padding: 0.4rem 1rem;
  border-radius: 100px;
  font-family: 'Space Mono', monospace;
  font-size: 0.75rem;
  color: var(--accent);
  letter-spacing: 1px;
  margin-bottom: 2rem;
  animation: fadeInUp 0.8s ease both;
}
.hero-badge .pulse {
  width: 8px; height: 8px;
  background: var(--accent);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

.hero h1 {
  font-size: clamp(2.2rem, 5.5vw, 4.2rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -2px;
  margin-bottom: 1.5rem;
  animation: fadeInUp 0.8s 0.15s ease both;
}
.hero h1 .highlight {
  background: linear-gradient(135deg, var(--accent), #00c2ff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-sub {
  max-width: 620px;
  font-size: 1.15rem;
  color: var(--text-dim);
  font-weight: 300;
  margin-bottom: 3rem;
  animation: fadeInUp 0.8s 0.3s ease both;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
  animation: fadeInUp 0.8s 0.45s ease both;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 2rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  transition: all 0.3s;
  cursor: pointer;
  border: none;
  font-family: inherit;
}
.btn-primary {
  background: var(--accent);
  color: var(--bg);
  box-shadow: 0 0 30px var(--accent-glow);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 40px var(--accent-glow-strong);
}
.btn-outline {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-glow);
}

.hero-stats {
  display: flex;
  gap: 3rem;
  margin-top: 4rem;
  animation: fadeInUp 0.8s 0.6s ease both;
}
.hero-stat {
  text-align: center;
}
.hero-stat .num {
  font-family: 'Space Mono', monospace;
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--accent);
}
.hero-stat .label {
  font-size: 0.78rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-top: 0.25rem;
}

/* ─── SECTIONS ─── */
section {
  position: relative;
  z-index: 1;
  padding: 6rem 2rem;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
}

.section-label {
  font-family: 'Space Mono', monospace;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 3px;
  color: var(--accent);
  margin-bottom: 1rem;
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 700;
  letter-spacing: -1px;
  margin-bottom: 1rem;
}

.section-desc {
  color: var(--text-dim);
  max-width: 600px;
  font-weight: 300;
  font-size: 1.05rem;
  margin-bottom: 3rem;
}

/* ─── FEATURES GRID ─── */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 2rem;
  transition: all 0.4s;
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0;
  transition: opacity 0.4s;
}
.feature-card:hover {
  border-color: rgba(0, 229, 160, 0.3);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}
.feature-card:hover::before { opacity: 1; }

.feature-icon {
  width: 48px; height: 48px;
  background: var(--accent-glow);
  border: 1px solid rgba(0, 229, 160, 0.2);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  margin-bottom: 1.2rem;
}

.feature-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}
.feature-card p {
  color: var(--text-dim);
  font-size: 0.9rem;
  font-weight: 300;
}

/* ─── HOW IT WORKS ─── */
.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

.step {
  position: relative;
  padding: 2rem 1.5rem;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  text-align: center;
}
.step-number {
  font-family: 'Space Mono', monospace;
  font-size: 2.5rem;
  font-weight: 700;
  color: rgba(0, 229, 160, 0.15);
  position: absolute;
  top: 0.8rem;
  right: 1.2rem;
}
.step h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  margin-top: 0.5rem;
}
.step p {
  font-size: 0.85rem;
  color: var(--text-dim);
  font-weight: 300;
}

/* ─── APPS (2-col grid) ─── */
.apps-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.app-card-h {
  display: flex;
  flex-direction: column;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
  transition: all 0.3s;
  text-decoration: none;
  color: inherit;
}
.app-card-h:hover {
  border-color: rgba(0, 229, 160, 0.3);
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}
.app-card-h:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.app-img {
  width: 100%;
}
.app-img img {
  width: 100%;
  height: auto;
  display: block;
  background: var(--bg-surface);
  object-fit: cover;
}

.app-info {
  display: flex;
  flex-direction: column;
  flex: 1;
  padding: 1.5rem;
}

.app-name {
  font-family: 'Space Mono', monospace;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 0.5rem;
}
.app-card-h .desc {
  color: var(--text-dim);
  font-size: 0.9rem;
  font-weight: 300;
  margin-bottom: 1rem;
}

.app-tags {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 0.75rem;
}
.app-tag {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  padding: 0.2rem 0.7rem;
  border-radius: 100px;
  font-size: 0.7rem;
  color: var(--text-muted);
  font-family: 'Space Mono', monospace;
}

.app-link {
  font-family: 'Space Mono', monospace;
  font-size: 0.85rem;
  color: var(--accent);
  font-weight: 700;
  transition: text-decoration 0.2s;
}
.app-card-h:hover .app-link {
  text-decoration: underline;
}

@media (max-width: 768px) {
  .apps-list {
    grid-template-columns: 1fr;
  }
}

/* ─── HARDWARE ─── */
.hw-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
}
.hw-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1.5rem 2rem;
  transition: all 0.3s;
}
.hw-card:hover {
  border-color: rgba(0, 229, 160, 0.3);
}
.hw-card h4 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 0.3rem;
}
.hw-card p {
  font-size: 0.85rem;
  color: var(--text-dim);
  font-weight: 300;
}
.hw-card .freq {
  display: inline-block;
  margin-top: 0.5rem;
  font-family: 'Space Mono', monospace;
  font-size: 0.7rem;
  color: var(--accent);
  background: var(--accent-glow);
  padding: 0.15rem 0.6rem;
  border-radius: 100px;
}

/* ─── PT COMMUNITY ─── */
.community-section {
  background: linear-gradient(180deg, transparent, rgba(0, 229, 160, 0.03), transparent);
}

.community-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

.community-text p {
  color: var(--text-dim);
  font-size: 0.95rem;
  font-weight: 300;
  margin-bottom: 1rem;
}

.community-links {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.community-link {
  display: flex;
  align-items: center;
  gap: 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.2rem 1.5rem;
  text-decoration: none;
  color: var(--text);
  transition: all 0.3s;
}
.community-link:hover {
  border-color: var(--accent);
  background: var(--accent-glow);
}
.community-link .icon {
  width: 40px; height: 40px;
  background: var(--accent-glow);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}
.community-link .link-text h4 {
  font-size: 0.9rem;
  font-weight: 600;
}
.community-link .link-text p {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin: 0;
}

/* ─── ISM PT NOTE ─── */
.ism-note {
  background: rgba(255, 107, 61, 0.08);
  border: 1px solid rgba(255, 107, 61, 0.2);
  border-radius: 12px;
  padding: 1.5rem 2rem;
  margin-top: 2rem;
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}
.ism-note .icon { font-size: 1.3rem; flex-shrink: 0; margin-top: 2px; }
.ism-note p {
  font-size: 0.85rem;
  color: var(--text-dim);
  font-weight: 300;
}
.ism-note strong { color: var(--warning); font-weight: 600; }

/* ─── RNODE CONFIG ─── */
/* ─── INTERFACE CONFIG (tabbed) ─── */
.iface-config {
  margin-top: 2.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 2rem;
}
.iface-config-header {
  display: flex;
  align-items: flex-start;
  gap: 1.2rem;
}
.iface-config-header h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.3rem;
}
.iface-config-header p {
  font-size: 0.85rem;
  color: var(--text-dim);
  font-weight: 300;
}
.iface-config-header code {
  font-family: 'Space Mono', monospace;
  font-size: 0.78rem;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  padding: 0.1rem 0.5rem;
  border-radius: 4px;
  color: var(--accent);
}

/* Tabs */
.iface-tabs {
  display: flex;
  gap: 0.5rem;
  margin-top: 1.5rem;
  flex-wrap: wrap;
}
.iface-radio {
  display: none;
}
.iface-tabs label {
  font-family: 'Space Mono', monospace;
  font-size: 0.78rem;
  font-weight: 700;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg-surface);
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.2s;
}
.iface-tabs label:hover {
  color: var(--text);
  border-color: var(--text-muted);
}
#tab-868:checked ~ .iface-tabs label[for="tab-868"],
#tab-433:checked ~ .iface-tabs label[for="tab-433"],
#tab-24g:checked ~ .iface-tabs label[for="tab-24g"],
#tab-wifi:checked ~ .iface-tabs label[for="tab-wifi"],
#tab-auto:checked ~ .iface-tabs label[for="tab-auto"],
#tab-tcp:checked ~ .iface-tabs label[for="tab-tcp"] {
  background: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
}

/* Panels — CSS-only tab switching */
.iface-panel {
  display: none;
  margin-top: 1.2rem;
}
#tab-868:checked ~ #panel-868,
#tab-433:checked ~ #panel-433,
#tab-24g:checked ~ #panel-24g,
#tab-wifi:checked ~ #panel-wifi,
#tab-auto:checked ~ #panel-auto,
#tab-tcp:checked ~ #panel-tcp {
  display: block;
}

/* Config params (shared) */
.config-params {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin-top: 1.2rem;
}
.config-param {
  display: grid;
  grid-template-columns: 140px 180px 1fr;
  gap: 1rem;
  align-items: baseline;
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--border);
}
.config-param:last-child { border-bottom: none; }
.param-label {
  font-family: 'Space Mono', monospace;
  font-size: 0.78rem;
  color: var(--accent);
  font-weight: 700;
}
.param-value {
  font-family: 'Space Mono', monospace;
  font-size: 0.78rem;
  color: var(--text);
  font-weight: 400;
}
.param-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 300;
}
@media (max-width: 768px) {
  .config-param {
    grid-template-columns: 1fr;
    gap: 0.2rem;
  }
  .iface-config-header {
    flex-direction: column;
  }
}

/* ─── CTA SECTION ─── */
.cta-section {
  text-align: center;
  padding: 8rem 2rem;
}
.cta-section h2 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  letter-spacing: -1px;
  margin-bottom: 1rem;
}
.cta-section p {
  color: var(--text-dim);
  max-width: 500px;
  margin: 0 auto 2.5rem;
  font-weight: 300;
  font-size: 1.05rem;
}

/* ─── FOOTER ─── */
footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--border);
  padding: 3rem 2rem;
}
.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}
.footer-left {
  font-family: 'Space Mono', monospace;
  font-size: 0.75rem;
  color: var(--text-muted);
}
.footer-left a { color: var(--accent); text-decoration: none; }
.footer-links {
  display: flex;
  gap: 1.5rem;
}
.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.8rem;
  transition: color 0.3s;
}
.footer-links a:hover { color: var(--accent); }

/* ─── ANIMATIONS ─── */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.5); }
}

.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ─── RESPONSIVE ─── */
@media (max-width: 768px) {
  nav { padding: 0.8rem 1.2rem; }
  .nav-links { gap: 1rem; }
  .nav-links a:not(.nav-cta) { display: none; }
  .hero-stats { gap: 1.5rem; }
  .community-content {
    grid-template-columns: 1fr;
  }
  .hero h1 { letter-spacing: -1px; }
}

/* ─── CODE SNIPPET STYLE ─── */
.code-block {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  margin-top: 2rem;
  overflow-x: auto;
}
.code-block pre {
  font-family: 'Space Mono', monospace;
  font-size: 0.8rem;
  color: var(--text-dim);
  line-height: 1.8;
}
.code-block .comment { color: var(--text-muted); }
.code-block .cmd { color: var(--accent); }
.code-block .flag { color: #00c2ff; }