/* ==========================================================================
   KAVEN SYSTEMS — Design System
   Matte Obsidian Black + Deep Tech Blue + Metallic Copper/Gold
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  /* Backgrounds */
  --bg-primary: #0b0c10;
  --bg-secondary: #121212;
  --bg-elevated: #16181d;

  /* Deep Tech Blue */
  --blue-deep: #0a3b66;
  --blue-mid: #005288;
  --blue-glow: #1c7fc4;

  /* Metallic Copper / Gold */
  --copper: #c88a58;
  --gold: #d4af37;
  --copper-glow: rgba(200, 138, 88, 0.45);

  /* Glass surfaces */
  --glass-bg: rgba(255, 255, 255, 0.03);
  --glass-bg-strong: rgba(255, 255, 255, 0.055);
  --glass-border: rgba(255, 255, 255, 0.08);
  --glass-border-copper: rgba(212, 175, 55, 0.35);

  /* Text */
  --text-primary: #f4f5f7;
  --text-secondary: #a7adb8;
  --text-tertiary: #6b7280;

  /* Status */
  --status-live: #34d399;
  --status-dev: #d4af37;

  /* Type */
  --font-display: 'Space Grotesk', 'Inter', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Radii */
  --r-sm: 8px;
  --r-md: 14px;
  --r-lg: 22px;
  --r-xl: 32px;

  /* Motion */
  --ease-apple: cubic-bezier(0.16, 1, 0.3, 1);
  --dur-fast: 0.25s;
  --dur-med: 0.5s;
  --dur-slow: 0.9s;

  --nav-h: 76px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-body);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
}

/* Ambient global backdrop: circuit texture + radial glow */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse 900px 600px at 15% -10%, rgba(10, 59, 102, 0.35), transparent 60%),
    radial-gradient(ellipse 700px 500px at 100% 20%, rgba(212, 175, 55, 0.08), transparent 55%),
    linear-gradient(180deg, #0b0c10 0%, #0d0f13 50%, #0b0c10 100%);
}

body::after {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.05;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200' viewBox='0 0 200 200'%3E%3Cg fill='none' stroke='%23C88A58' stroke-width='1'%3E%3Cpath d='M0 40h60v40h40'/%3E%3Cpath d='M200 100h-50v60h-60v40'/%3E%3Cpath d='M20 200v-60h80v-40h60'/%3E%3Cpath d='M160 0v30h-40v50'/%3E%3Ccircle cx='60' cy='80' r='3'/%3E%3Ccircle cx='100' cy='140' r='3'/%3E%3Ccircle cx='120' cy='30' r='3'/%3E%3Ccircle cx='150' cy='160' r='3'/%3E%3C/g%3E%3C/svg%3E");
  background-size: 400px 400px;
}

main, header, footer, section { position: relative; z-index: 1; }

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

a { color: inherit; text-decoration: none; }

ul { list-style: none; }

button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }

.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 32px;
}

/* ==========================================================================
   Typography
   ========================================================================== */

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.1;
}

h1 { font-size: clamp(2.8rem, 6.4vw, 5.6rem); font-weight: 700; }
h2 { font-size: clamp(2rem, 3.6vw, 3rem); }
h3 { font-size: clamp(1.25rem, 2vw, 1.6rem); }

/* Hargrave-style stacked hero headline: each line its own block, tight leading */
.hero-headline { font-size: clamp(2.8rem, 6.4vw, 5.6rem); font-weight: 700; font-family: var(--font-display); letter-spacing: -0.02em; line-height: 1.04; }
.hero-headline span { display: block; }
.hero-headline .hl-muted { color: var(--text-secondary); font-weight: 500; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--copper);
  margin-bottom: 18px;
}

.eyebrow::before {
  content: '';
  width: 22px;
  height: 1px;
  background: var(--copper);
}

.section-head {
  max-width: 680px;
  margin: 0 0 56px;
}

.section-head p {
  color: var(--text-secondary);
  font-size: 1.08rem;
  margin-top: 16px;
  max-width: 620px;
}

.text-grad {
  background: linear-gradient(120deg, #ffffff 20%, #bcd7ec 50%, #d4af37 90%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ==========================================================================
   Navigation
   ========================================================================== */

.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  background: rgba(11, 12, 16, 0.55);
  backdrop-filter: blur(20px) saturate(140%);
  -webkit-backdrop-filter: blur(20px) saturate(140%);
  border-bottom: 1px solid var(--glass-border);
  transition: background var(--dur-fast) var(--ease-apple), border-color var(--dur-fast) var(--ease-apple);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}

.brand .logo-mark {
  width: 40px;
  height: 40px;
  object-fit: contain;
  filter: drop-shadow(0 0 10px rgba(28,127,196,0.25));
}

.footer-brand .logo-mark {
  width: 44px;
  height: 44px;
  object-fit: contain;
}

.brand .brand-name span {
  display: block;
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 0.62rem;
  letter-spacing: 0.16em;
  color: var(--text-tertiary);
  text-transform: uppercase;
  margin-top: 1px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 40px;
}

.nav-links a {
  position: relative;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--dur-fast) var(--ease-apple);
  padding: 6px 0;
}

.nav-links a::after {
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 2px;
  background: linear-gradient(90deg, var(--blue-glow), var(--copper));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur-fast) var(--ease-apple);
}

.nav-links a:hover { color: var(--text-primary); }
.nav-links a:hover::after,
.nav-links a.active::after { transform: scaleX(1); }
.nav-links a.active { color: var(--text-primary); }

.nav-cta { display: flex; align-items: center; gap: 16px; }

.nav-toggle {
  display: none;
  width: 40px; height: 40px;
  align-items: center; justify-content: center;
  border: 1px solid var(--glass-border);
  border-radius: var(--r-sm);
}
.nav-toggle span, .nav-toggle::before, .nav-toggle::after {
  content: ''; display: block; width: 18px; height: 1.5px; background: var(--text-primary);
  position: relative; transition: transform var(--dur-fast) var(--ease-apple);
}
.nav-toggle::before { transform: translateY(-6px); }
.nav-toggle::after { transform: translateY(5px); }

/* ==========================================================================
   Stat Strip — full-bleed banded numbers (Hargrave-style)
   ========================================================================== */

.stat-strip {
  border-top: 1px solid var(--glass-border);
  border-bottom: 1px solid var(--glass-border);
  background: linear-gradient(180deg, rgba(255,255,255,0.015), transparent);
}

.stat-strip .container {
  display: flex;
  flex-wrap: wrap;
  padding-top: 0;
  padding-bottom: 0;
}

.stat-item {
  flex: 1 1 200px;
  padding: 40px 32px;
  border-right: 1px solid var(--glass-border);
  text-align: center;
}
.stat-item:last-child { border-right: none; }

.stat-num {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.9rem, 3.4vw, 2.6rem);
  letter-spacing: -0.02em;
  background: linear-gradient(120deg, #ffffff, #d4af37);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.stat-label {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-tertiary);
}

@media (max-width: 760px) {
  .stat-item { flex: 1 1 50%; border-right: none; border-bottom: 1px solid var(--glass-border); }
}

/* ==========================================================================
   Feature Block — alternating image / copy editorial section (Hargrave-style)
   ========================================================================== */

.feature-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 72px;
  align-items: center;
}

.feature-block.reverse .feature-media { order: 2; }
.feature-block.reverse .feature-copy { order: 1; }

.feature-media {
  position: relative;
  border-radius: var(--r-xl);
  overflow: hidden;
  background: radial-gradient(circle at 50% 40%, rgba(28,127,196,0.16), transparent 70%), #0d0f13;
  border: 1px solid var(--glass-border);
  padding: 48px;
}

.feature-media img { width: 100%; }

/* Real photography variant — full-bleed, no padding/glow needed */
.feature-media.photo {
  padding: 0;
  aspect-ratio: 16 / 11;
  background: #0d0f13;
}
.feature-media.photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.badge-row {
  position: absolute;
  top: 20px;
  left: 20px;
  z-index: 2;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.tag-ndaa {
  color: #cfd9e3;
  background: rgba(167, 173, 184, 0.1);
  border: 1px solid rgba(167, 173, 184, 0.35);
}
.tag-ndaa::before { background: #cfd9e3; box-shadow: 0 0 8px rgba(207,217,227,0.6); }

.feature-copy .spec-list {
  margin-top: 26px;
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid var(--glass-border);
}

.spec-row {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--glass-border);
  font-size: 0.92rem;
}
.spec-row .spec-key { color: var(--text-tertiary); font-family: var(--font-mono); font-size: 0.78rem; letter-spacing: 0.04em; text-transform: uppercase; }
.spec-row .spec-val { color: var(--text-primary); font-weight: 500; text-align: right; }

.feature-cta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-top: 30px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--text-primary);
  padding-bottom: 4px;
  border-bottom: 1px solid var(--glass-border-copper);
  transition: gap var(--dur-fast) var(--ease-apple), color var(--dur-fast) var(--ease-apple), border-color var(--dur-fast) var(--ease-apple);
}
.feature-cta::after { content: '→'; color: var(--copper); transition: transform var(--dur-fast) var(--ease-apple); }
.feature-cta:hover { gap: 16px; border-color: var(--copper); }
.feature-cta:hover::after { transform: translateX(2px); }

@media (max-width: 900px) {
  .feature-block { grid-template-columns: 1fr; gap: 36px; }
  .feature-block.reverse .feature-media { order: 1; }
  .feature-block.reverse .feature-copy { order: 2; }
  .feature-media { padding: 28px; }
}

/* ==========================================================================
   Buttons — Apple-style tactile
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 28px;
  border-radius: 100px;
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  white-space: nowrap;
  transition: transform var(--dur-fast) var(--ease-apple),
              box-shadow var(--dur-fast) var(--ease-apple),
              background var(--dur-fast) var(--ease-apple),
              border-color var(--dur-fast) var(--ease-apple);
  will-change: transform;
}

.btn:active { transform: scale(0.97); }

.btn-primary {
  background: linear-gradient(135deg, var(--blue-mid), var(--blue-deep));
  color: #fff;
  border: 1px solid rgba(255,255,255,0.08);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 26px rgba(0, 82, 136, 0.55), 0 8px 20px rgba(0,0,0,0.35);
}

.btn-secondary {
  background: var(--glass-bg);
  color: var(--text-primary);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(10px);
}
.btn-secondary:hover {
  transform: translateY(-2px);
  border-color: rgba(212,175,55,0.5);
  box-shadow: 0 0 20px rgba(212, 175, 55, 0.25);
}

.btn-copper {
  background: linear-gradient(135deg, var(--gold), var(--copper));
  color: #1a1305;
  border: 1px solid rgba(255,255,255,0.15);
}
.btn-copper:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 24px rgba(212, 175, 55, 0.5);
}

.btn-ghost {
  color: var(--copper);
  padding: 8px 0;
  font-size: 0.88rem;
  border-radius: 0;
}
.btn-ghost::after { content: '→'; margin-left: 6px; transition: transform var(--dur-fast) var(--ease-apple); display: inline-block; }
.btn-ghost:hover::after { transform: translateX(4px); }

.btn-block { width: 100%; }
.btn-lg { padding: 16px 36px; font-size: 1rem; }

/* ==========================================================================
   Glass Panels / Cards
   ========================================================================== */

.glass-panel {
  background: rgba(255,255,255,0.025);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-radius: var(--r-lg);
}

.card {
  background: rgba(255,255,255,0.02);
  border: 1px solid var(--glass-border);
  border-radius: var(--r-lg);
  backdrop-filter: blur(8px);
  padding: 32px;
  transition: transform var(--dur-med) var(--ease-apple),
              border-color var(--dur-med) var(--ease-apple),
              box-shadow var(--dur-med) var(--ease-apple),
              background var(--dur-med) var(--ease-apple);
}

.card:hover {
  transform: translateY(-6px);
  background: var(--glass-bg-strong);
  border-color: var(--glass-border-copper);
  box-shadow: 0 20px 50px rgba(0,0,0,0.45), 0 0 30px rgba(212, 175, 55, 0.08);
}

/* Tags */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 6px 12px;
  border-radius: 100px;
  font-weight: 500;
}
.tag::before { content: ''; width: 6px; height: 6px; border-radius: 50%; }

.tag-live {
  color: var(--status-live);
  background: rgba(52, 211, 153, 0.1);
  border: 1px solid rgba(52, 211, 153, 0.3);
}
.tag-live::before { background: var(--status-live); box-shadow: 0 0 8px var(--status-live); }

.tag-dev {
  color: var(--status-dev);
  background: rgba(212, 175, 55, 0.1);
  border: 1px solid rgba(212, 175, 55, 0.3);
}
.tag-dev::before { background: var(--status-dev); box-shadow: 0 0 8px var(--status-dev); }

/* ==========================================================================
   Reveal-on-scroll
   ========================================================================== */

.reveal {
  opacity: 0;
  transform: translateY(28px);
  filter: blur(6px);
  transition: opacity 0.9s var(--ease-apple), transform 0.9s var(--ease-apple), filter 0.9s var(--ease-apple);
}
.reveal.in-view {
  opacity: 1;
  transform: translateY(0);
  filter: blur(0);
}
.reveal-delay-1 { transition-delay: 0.08s; }
.reveal-delay-2 { transition-delay: 0.16s; }
.reveal-delay-3 { transition-delay: 0.24s; }
.reveal-delay-4 { transition-delay: 0.32s; }
.reveal-delay-5 { transition-delay: 0.4s; }

/* ==========================================================================
   Section base
   ========================================================================== */

section { padding: 130px 0; }
.section-tight { padding: 90px 0; }
.feature-gap { display: flex; flex-direction: column; gap: 130px; }
.section-alt { background: linear-gradient(180deg, transparent, rgba(255,255,255,0.015), transparent); }

.divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--glass-border), transparent);
  margin: 0;
}

/* ==========================================================================
   Footer
   ========================================================================== */

footer {
  padding: 70px 0 40px;
  border-top: 1px solid var(--glass-border);
  background: linear-gradient(180deg, transparent, rgba(0,0,0,0.3));
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 50px;
}

.footer-brand p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: 16px;
  max-width: 280px;
}

.footer-col h4 {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: 18px;
  font-weight: 500;
}

.footer-col a, .footer-col li {
  display: block;
  color: var(--text-secondary);
  font-size: 0.92rem;
  margin-bottom: 12px;
  transition: color var(--dur-fast) var(--ease-apple);
}
.footer-col a:hover { color: var(--copper); }

.footer-social {
  display: flex;
  gap: 10px;
  margin-top: 20px;
}
.footer-social a {
  width: 38px; height: 38px;
  border-radius: 50%;
  border: 1px solid var(--glass-border);
  display: flex; align-items: center; justify-content: center;
  transition: border-color var(--dur-fast) var(--ease-apple), transform var(--dur-fast) var(--ease-apple), background var(--dur-fast) var(--ease-apple);
}
.footer-social a:hover { border-color: var(--glass-border-copper); background: rgba(212,175,55,0.06); transform: translateY(-2px); }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  color: var(--text-tertiary);
  flex-wrap: wrap;
  gap: 12px;
}

/* ==========================================================================
   Utility
   ========================================================================== */

.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.grid-5 { display: grid; grid-template-columns: repeat(5, 1fr); gap: 24px; }

.flex-between { display: flex; align-items: center; justify-content: space-between; }
.flex-center { display: flex; align-items: center; justify-content: center; }

.mono { font-family: var(--font-mono); }
.text-secondary { color: var(--text-secondary); }
.text-copper { color: var(--copper); }
.text-blue { color: var(--blue-glow); }

.pill-badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 100px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  border: 1px solid var(--glass-border-copper);
  color: var(--copper);
  background: rgba(212,175,55,0.06);
}

/* Circuit corner accents used on panels/cards */
.circuit-corner {
  position: absolute;
  width: 60px; height: 60px;
  pointer-events: none;
  opacity: 0.5;
}
.circuit-corner.tl { top: 0; left: 0; }
.circuit-corner.br { bottom: 0; right: 0; transform: rotate(180deg); }

/* ==========================================================================
   Page hero backdrop (used on inner pages)
   ========================================================================== */

.page-hero {
  padding: calc(var(--nav-h) + 90px) 0 70px;
}

.page-hero .eyebrow { justify-content: flex-start; }

/* ==========================================================================
   Form Elements
   ========================================================================== */

.form-group { margin-bottom: 24px; }

.form-group label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: 10px;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 14px 16px;
  background: rgba(0,0,0,0.35);
  border: 1px solid var(--glass-border);
  border-radius: var(--r-sm);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.94rem;
  transition: border-color var(--dur-fast) var(--ease-apple), box-shadow var(--dur-fast) var(--ease-apple);
}

.form-group input::placeholder,
.form-group textarea::placeholder { color: var(--text-tertiary); }

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--copper);
  box-shadow: 0 0 0 3px rgba(212, 175, 55, 0.16), 0 0 18px rgba(212, 175, 55, 0.15);
}

.form-group select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%23a7adb8' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
  cursor: pointer;
}

.form-group textarea { resize: vertical; min-height: 140px; }

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }

.contact-form-panel {
  background: rgba(0,0,0,0.28);
  border: 1px solid var(--glass-border-copper);
  border-radius: var(--r-xl);
  padding: 48px;
  position: relative;
  overflow: hidden;
}

.contact-info-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 20px 0;
  border-bottom: 1px solid var(--glass-border);
}
.contact-info-item:last-child { border-bottom: none; }
.contact-info-item .icon-box {
  width: 42px; height: 42px;
  border-radius: var(--r-sm);
  background: rgba(28,127,196,0.12);
  border: 1px solid rgba(28,127,196,0.3);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}

@media (max-width: 640px) {
  .form-row { grid-template-columns: 1fr; }
  .contact-form-panel { padding: 28px; }
}

/* ==========================================================================
   Docs Portal Layout
   ========================================================================== */

.docs-shell {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 48px;
  align-items: start;
}

.docs-sidebar {
  position: sticky;
  top: calc(var(--nav-h) + 32px);
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.docs-nav-group h5 {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: 10px;
  font-weight: 500;
}

.docs-nav-group a {
  display: block;
  padding: 7px 12px;
  margin-left: -12px;
  border-radius: var(--r-sm);
  font-size: 0.88rem;
  color: var(--text-secondary);
  border-left: 2px solid transparent;
  transition: color var(--dur-fast) var(--ease-apple), background var(--dur-fast) var(--ease-apple), border-color var(--dur-fast) var(--ease-apple);
}

.docs-nav-group a:hover { color: var(--text-primary); background: var(--glass-bg); }
.docs-nav-group a.doc-active { color: var(--copper); border-left-color: var(--copper); background: rgba(212,175,55,0.06); }

.docs-content > section {
  padding: 0 0 64px;
  border-bottom: 1px solid var(--glass-border);
  margin-bottom: 64px;
  scroll-margin-top: 100px;
}
.docs-content > section:last-child { border-bottom: none; margin-bottom: 0; }

.code-block {
  background: #08090c;
  border: 1px solid var(--glass-border);
  border-radius: var(--r-md);
  padding: 20px 22px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: #9fd0f0;
  overflow-x: auto;
  line-height: 1.7;
}
.code-block .comment { color: #5c6470; }
.code-block .key { color: #d4af37; }

.download-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 18px 20px;
  border-radius: var(--r-md);
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  transition: border-color var(--dur-fast) var(--ease-apple), transform var(--dur-fast) var(--ease-apple), background var(--dur-fast) var(--ease-apple);
}
.download-card:hover {
  border-color: var(--glass-border-copper);
  background: var(--glass-bg-strong);
  transform: translateX(4px);
}
.download-card .file-icon {
  width: 40px; height: 40px;
  border-radius: var(--r-sm);
  display: flex; align-items: center; justify-content: center;
  background: rgba(28,127,196,0.12);
  border: 1px solid rgba(28,127,196,0.3);
  flex-shrink: 0;
}
.download-card .file-meta { flex: 1; min-width: 0; }
.download-card .file-name { font-weight: 600; font-size: 0.92rem; }
.download-card .file-sub { font-size: 0.78rem; color: var(--text-tertiary); font-family: var(--font-mono); margin-top: 2px; }
.download-card .file-action { color: var(--copper); font-size: 0.8rem; font-family: var(--font-mono); flex-shrink: 0; }

.pinout-diagram {
  border: 1px solid var(--glass-border);
  border-radius: var(--r-md);
  background: #08090c;
  padding: 24px;
  overflow-x: auto;
}

.pin-row {
  display: grid;
  grid-template-columns: 32px 1fr 1fr 32px;
  gap: 12px;
  align-items: center;
  padding: 8px 0;
  border-bottom: 1px solid rgba(255,255,255,0.05);
  font-size: 0.82rem;
}
.pin-row:last-child { border-bottom: none; }
.pin-num {
  width: 26px; height: 26px;
  border-radius: 50%;
  border: 1px solid var(--blue-glow);
  color: var(--blue-glow);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.7rem;
}
.pin-num.copper { border-color: var(--copper); color: var(--copper); }

.doc-tabs {
  display: flex;
  gap: 6px;
  padding: 5px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 100px;
  width: fit-content;
  margin-bottom: 24px;
}
.doc-tabs [data-tab] {
  padding: 8px 18px;
  border-radius: 100px;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--dur-fast) var(--ease-apple);
}
.doc-tabs [data-tab].active {
  background: linear-gradient(135deg, var(--blue-mid), var(--blue-deep));
  color: #fff;
}

@media (max-width: 900px) {
  .docs-shell { grid-template-columns: 1fr; }
  .docs-sidebar { position: relative; top: 0; flex-direction: row; overflow-x: auto; padding-bottom: 8px; }
  .docs-nav-group { flex-shrink: 0; }
}

/* ==========================================================================
   Product Docs — quick-jump nav, key ratings, step wizard
   ========================================================================== */

.doc-jump {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 28px;
}
.doc-jump a {
  padding: 8px 16px;
  border-radius: 100px;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-secondary);
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  transition: color var(--dur-fast) var(--ease-apple), border-color var(--dur-fast) var(--ease-apple), background var(--dur-fast) var(--ease-apple);
}
.doc-jump a:hover { color: var(--text-primary); border-color: var(--glass-border-copper); background: rgba(212,175,55,0.06); }

.rating-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.rating-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--r-lg);
  padding: 26px 22px;
  text-align: center;
}
.rating-card .rating-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-tertiary);
}
.rating-card .rating-value {
  margin-top: 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.3rem;
  color: var(--text-primary);
}
@media (max-width: 760px) {
  .rating-grid { grid-template-columns: repeat(2, 1fr); }
}

/* Step wizard — reuses [data-tab]/[data-tab-panel] switching from main.js */
.step-wizard-nav {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 28px;
}
.step-wizard-nav [data-tab] {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 20px 12px 14px;
  border-radius: 100px;
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--dur-fast) var(--ease-apple);
}
.step-wizard-nav [data-tab] .step-num {
  width: 22px; height: 22px;
  border-radius: 50%;
  border: 1px solid var(--glass-border);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  flex-shrink: 0;
}
.step-wizard-nav [data-tab].active {
  color: #fff;
  border-color: transparent;
  background: linear-gradient(135deg, var(--blue-mid), var(--blue-deep));
}
.step-wizard-nav [data-tab].active .step-num { border-color: rgba(255,255,255,0.5); color: #fff; }

.step-panel {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--r-xl);
  padding: 44px;
}
.step-panel ol {
  margin: 20px 0 0;
  padding-left: 22px;
  color: var(--text-secondary);
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.step-panel ol li { padding-left: 4px; }
.step-panel ol li strong { color: var(--text-primary); }

.step-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 28px;
  gap: 16px;
  flex-wrap: wrap;
}
.step-footer .step-progress {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--text-tertiary);
  letter-spacing: 0.05em;
}

@media (max-width: 640px) {
  .step-panel { padding: 28px; }
  .rating-grid { grid-template-columns: 1fr 1fr; }
}

/* ==========================================================================
   Responsive
   ========================================================================== */

@media (max-width: 980px) {
  .nav-links {
    display: none;
    position: fixed;
    top: var(--nav-h);
    left: 0; right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    padding: 20px 32px 28px;
    background: rgba(11, 12, 16, 0.96);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
  }
  .nav-links.mobile-open { display: flex; }
  .nav-links a { width: 100%; padding: 12px 0; font-size: 1rem; }
  .nav-toggle { display: flex; }
  .nav-cta .btn span { display: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .grid-5 { grid-template-columns: repeat(2, 1fr); }
  section { padding: 80px 0; }
}

@media (max-width: 560px) {
  .nav-cta .btn-primary { padding: 10px 16px; font-size: 0.8rem; }
}

@media (max-width: 640px) {
  .container { padding: 0 20px; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  h1 { font-size: 2.4rem; }
  .card { padding: 24px; }
}