/* ============================================================
   ROOT VARIABLES
   ============================================================ */
:root {
  --bg:           #05091a;
  --bg-2:         #080d22;
  --surface:      rgba(255,255,255,0.03);
  --surface-2:    rgba(255,255,255,0.06);
  --border:       rgba(255,255,255,0.08);
  --border-2:     rgba(255,255,255,0.14);
  --primary:      #00d066;
  --primary-dim:  rgba(0,208,102,0.12);
  --secondary:    #7c3aed;
  --text-1:       #e2e8f0;
  --text-2:       #94a3b8;
  --text-3:       #64748b;
  --radius:       16px;
  --radius-sm:    10px;
  --nav-h:        68px;
  --ease:         cubic-bezier(0.4,0,0.2,1);
  --transition:   0.25s var(--ease);
}

/* ============================================================
   RESET
   ============================================================ */
*,*::before,*::after { box-sizing:border-box; margin:0; padding:0; }
html { scroll-behavior:smooth; -webkit-font-smoothing:antialiased; }
body {
  background:var(--bg); color:var(--text-1);
  font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',system-ui,sans-serif;
  min-height:100vh; overflow-x:hidden; line-height:1.6;
}
a  { color:inherit; text-decoration:none; }
button { cursor:pointer; border:none; background:none; font:inherit; color:inherit; }
ul,ol { list-style:none; }
img,svg { display:block; max-width:100%; }
input { font:inherit; color:inherit; }
::selection { background:rgba(0,208,102,0.25); color:var(--text-1); }

/* ============================================================
   BACKGROUND + CANVAS
   ============================================================ */
#particle-canvas {
  position:fixed; inset:0;
  width:100%; height:100%;
  z-index:0; pointer-events:none;
}
.grid-overlay {
  position:absolute; inset:0;
  background-image:
    linear-gradient(rgba(0,208,102,0.025) 1px, transparent 1px),
    linear-gradient(90deg,rgba(0,208,102,0.025) 1px,transparent 1px);
  background-size:64px 64px;
  pointer-events:none;
  mask-image:radial-gradient(ellipse 80% 80% at 50% 50%,black 40%,transparent 100%);
  -webkit-mask-image:radial-gradient(ellipse 80% 80% at 50% 50%,black 40%,transparent 100%);
}

/* ============================================================
   NAVBAR
   ============================================================ */
.navbar {
  position:fixed; top:0; left:0; right:0; z-index:100;
  background:rgba(5,9,26,0.6);
  backdrop-filter:blur(24px); -webkit-backdrop-filter:blur(24px);
  border-bottom:1px solid var(--border);
  transition:background var(--transition),box-shadow var(--transition),transform 0.3s var(--ease);
}
.navbar.scrolled {
  background:rgba(5,9,26,0.94);
  box-shadow:0 4px 40px rgba(0,0,0,0.5);
}
.navbar.hide { transform:translateY(-100%); }
.navbar.show { transform:translateY(0); }
.nav-inner {
  width:100%; padding:0 40px; height:var(--nav-h);
  display:flex; align-items:center; gap:20px;
}
.nav-brand {
  display:flex; align-items:center; gap:10px;
  cursor:pointer; flex-shrink:0;
}
.brand-logo { font-size:1.4rem; }
.brand-text {
  font-size:1.25rem; font-weight:800; letter-spacing:-0.02em; white-space:nowrap;
  background:linear-gradient(135deg,var(--text-1),var(--primary));
  -webkit-background-clip:text; -webkit-text-fill-color:transparent; background-clip:text;
}

/* ============================================================
   APP
   ============================================================ */
#app { position:relative; z-index:1; min-height:100vh; padding-top:var(--nav-h); }

/* ============================================================
   HERO
   ============================================================ */
.hero {
  padding:96px 40px 80px;
  position:relative; overflow:hidden;
}
.hero-inner {
  position:relative; z-index:1;
  max-width:1200px; margin:0 auto;
  display:flex; align-items:center; justify-content:space-between;
  gap:60px;
}
.hero-content {
  flex:1 1 0; min-width:0; max-width:620px;
  text-align:left;
}
.hero-logo-wrap {
  flex:0 0 auto;
  display:flex; align-items:center; justify-content:center;
  animation:fadeDown 0.9s 0.4s ease both;
}
.hero-logo {
  width:clamp(220px,28vw,360px);
  height:clamp(220px,28vw,360px);
  filter:drop-shadow(0 0 40px rgba(0,208,102,0.25)) drop-shadow(0 20px 50px rgba(0,0,0,0.5));
  animation:floatLogo 6s ease-in-out infinite;
}
.hero-logo svg {
  width:100%; height:100%;
}
@keyframes floatLogo {
  0%,100% { transform:translateY(0) rotate(-1deg); }
  50%      { transform:translateY(-14px) rotate(1deg); }
}
.hero-badge {
  display:inline-flex; align-items:center; gap:8px;
  padding:6px 18px;
  background:rgba(0,208,102,0.07); border:1px solid rgba(0,208,102,0.2);
  border-radius:50px; font-size:0.82rem; color:var(--primary);
  margin-bottom:28px;
  animation:fadeDown 0.7s ease both;
}
.hero-title {
  font-size:clamp(2.6rem,6.5vw,5.5rem);
  font-weight:900; letter-spacing:-0.04em; line-height:1.05;
  margin-bottom:22px;
  animation:fadeDown 0.7s 0.1s ease both;
}
.gradient-text {
  background:linear-gradient(135deg,#00d066 0%,#7c3aed 100%);
  -webkit-background-clip:text; -webkit-text-fill-color:transparent; background-clip:text;
}
.hero-sub {
  font-size:clamp(0.95rem,2vw,1.15rem);
  color:var(--text-2); max-width:540px; margin:0 0 44px;
  line-height:1.8; animation:fadeDown 0.7s 0.2s ease both;
}
.hero-stats {
  display:flex; justify-content:flex-start; gap:16px; flex-wrap:wrap;
  animation:fadeDown 0.7s 0.3s ease both;
}
.stat-chip {
  display:flex; align-items:center; gap:8px;
  padding:10px 18px;
  background:rgba(var(--cat-rgb,0,208,102),0.06);
  border:1px solid rgba(var(--cat-rgb,0,208,102),0.18);
  border-radius:50px;
  transition:all var(--transition);
  cursor:default;
}
.stat-chip:hover {
  background:rgba(var(--cat-rgb,0,208,102),0.12);
  border-color:rgba(var(--cat-rgb,0,208,102),0.35);
  transform:translateY(-2px);
  box-shadow:0 8px 24px rgba(var(--cat-rgb,0,208,102),0.15);
}
.stat-icon { font-size:1rem; }
.stat-num  { font-size:1.1rem; font-weight:800; color:var(--cat-color,var(--primary)); }
.stat-label { font-size:0.75rem; color:var(--text-3); }

/* ============================================================
   SEARCH SECTION
   ============================================================ */
.search-section { padding:0 40px 40px; }
.search-wrap { max-width:660px; margin:0 auto 24px; }
.search-box {
  position:relative;
  display:flex; align-items:center;
}
.search-box input {
  width:100%; padding:16px 52px 16px 52px;
  background:rgba(255,255,255,0.04);
  border:1px solid var(--border-2);
  border-radius:50px; font-size:1rem; outline:none;
  transition:border-color var(--transition),box-shadow var(--transition),background var(--transition);
}
.search-box input::placeholder { color:var(--text-3); }
.search-box input:focus {
  background:rgba(255,255,255,0.06);
  border-color:var(--primary);
  box-shadow:0 0 0 4px rgba(0,208,102,0.1),0 8px 48px rgba(0,208,102,0.1);
}
.search-icon {
  position:absolute; left:20px;
  font-size:1.05rem; pointer-events:none;
  transition:filter var(--transition);
}
.search-box input:focus ~ .search-clear { }
.search-clear {
  position:absolute; right:14px;
  width:30px; height:30px; border-radius:50%;
  background:rgba(255,255,255,0.08); color:var(--text-3);
  display:none; align-items:center; justify-content:center;
  font-size:12px; cursor:pointer;
  transition:background var(--transition),color var(--transition);
}
.search-clear:hover { background:rgba(255,255,255,0.14); color:var(--text-1); }

/* Category filter */
.cat-filter {
  display:flex; flex-wrap:wrap; justify-content:center; gap:8px;
  max-width:900px; margin:0 auto;
}
.cat-btn {
  display:inline-flex; align-items:center; gap:7px;
  padding:8px 18px;
  background:var(--surface); border:1px solid var(--border);
  border-radius:50px; font-size:0.85rem; color:var(--text-2); font-weight:500;
  white-space:nowrap; transition:all var(--transition);
}
.cat-btn:hover {
  background:var(--surface-2); border-color:var(--border-2); color:var(--text-1);
  transform:translateY(-1px);
}
.cat-btn.active {
  border-color:var(--cat-color,var(--primary));
  color:var(--cat-color,var(--primary));
  background:rgba(var(--cat-rgb,0,208,102),0.08);
  box-shadow:0 0 20px rgba(var(--cat-rgb,0,208,102),0.15);
}
.cat-count {
  font-size:0.7rem; padding:1px 7px; border-radius:10px;
  background:rgba(255,255,255,0.07); opacity:0.8;
}

/* ============================================================
   CARDS SECTION
   ============================================================ */
.cards-section { padding:0 40px 80px; }
.cards-header {
  display:flex; align-items:center; justify-content:space-between;
  margin-bottom:22px;
}
.cards-title {
  font-size:1.25rem; font-weight:700; color:var(--text-1);
}
.cards-count { font-size:0.875rem; color:var(--text-3); }
.cards-grid {
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(300px,1fr));
  gap:20px;
}
.no-results {
  text-align:center; padding:80px 24px; color:var(--text-3);
}
.no-results-icon { font-size:3.5rem; margin-bottom:16px; }
.no-results h3 { font-size:1.25rem; font-weight:700; color:var(--text-2); margin-bottom:10px; }

/* ============================================================
   CARDS
   ============================================================ */
.card {
  position:relative; overflow:hidden;
  background:rgba(255,255,255,0.025);
  border:1px solid var(--border);
  border-radius:var(--radius);
  cursor:pointer; outline:none;
  transition:
    transform 0.35s cubic-bezier(0.34,1.56,0.64,1),
    box-shadow 0.3s var(--ease),
    border-color 0.3s var(--ease),
    background 0.3s var(--ease);
  animation:cardIn 0.5s ease both;
  padding:22px 22px 0;
}
.card::before {
  content:''; position:absolute; top:0; left:0; right:0; height:2px;
  background:linear-gradient(90deg,var(--cat-color,var(--primary)),transparent 70%);
  opacity:0; transition:opacity 0.3s;
}
.card-glow {
  position:absolute; inset:0; pointer-events:none;
  background:radial-gradient(ellipse at top left,rgba(var(--cat-rgb,0,208,102),0.06) 0%,transparent 60%);
  opacity:0; transition:opacity 0.4s;
}
.card:hover {
  transform:translateY(-9px) scale(1.01);
  border-color:rgba(var(--cat-rgb,0,208,102),0.3);
  background:rgba(255,255,255,0.04);
  box-shadow:
    0 24px 64px rgba(0,0,0,0.45),
    0 0 0 1px rgba(var(--cat-rgb,0,208,102),0.1),
    0 0 40px rgba(var(--cat-rgb,0,208,102),0.08);
}
.card:hover::before  { opacity:1; }
.card:hover .card-glow { opacity:1; }
.card:focus-visible {
  outline:2px solid var(--primary);
  outline-offset:3px;
}

.card-top {
  display:flex; align-items:flex-start; justify-content:space-between;
  gap:10px; margin-bottom:14px;
}
.card-cat-tag {
  display:inline-flex; align-items:center; gap:5px;
  padding:4px 12px; border-radius:20px;
  font-size:0.7rem; font-weight:700; letter-spacing:0.02em;
  border:1px solid rgba(var(--cat-rgb,0,208,102),0.2);
}
.card-diff { font-size:1rem; flex-shrink:0; }
.card-icon { font-size:2.2rem; margin-bottom:12px; transition:transform 0.35s cubic-bezier(0.34,1.56,0.64,1); }
.card:hover .card-icon { transform:scale(1.15) rotate(5deg); }
.card-title { font-size:1.1rem; font-weight:700; color:var(--text-1); margin-bottom:3px; line-height:1.3; }
.card-sub  { font-size:0.76rem; color:var(--cat-color,var(--primary)); font-weight:600; margin-bottom:10px; opacity:0.9; }
.card-desc {
  font-size:0.865rem; color:var(--text-2); line-height:1.65; margin-bottom:14px;
  display:-webkit-box; -webkit-line-clamp:3; -webkit-box-orient:vertical; overflow:hidden;
}
.card-tags { display:flex; flex-wrap:wrap; gap:5px; margin-bottom:16px; }
.tag {
  font-size:0.68rem; color:var(--text-3);
  background:rgba(255,255,255,0.04); border:1px solid var(--border);
  border-radius:4px; padding:2px 7px;
}
.card-footer {
  margin:0 -22px;
  padding:12px 22px;
  border-top:1px solid var(--border);
  display:flex; align-items:center; justify-content:space-between;
}
.card-diff-text { font-size:0.75rem; color:var(--text-3); }
.card-arrow {
  font-size:1rem; color:var(--cat-color,var(--primary));
  transition:transform 0.3s;
}
.card:hover .card-arrow { transform:translateX(5px); }

/* ============================================================
   CONCEPT DETAIL – HERO SECTION
   ============================================================ */
.concept-hero {
  position:relative; overflow:hidden;
  padding:40px 40px 64px;
  border-bottom:1px solid var(--border);
}
.concept-hero::before {
  content:''; position:absolute; inset:0;
  background:linear-gradient(135deg,rgba(var(--cat-rgb,0,208,102),0.06) 0%,transparent 55%);
  pointer-events:none; z-index:0;
}
.concept-hero::after {
  content:''; position:absolute; bottom:0; left:0; right:0; height:1px;
  background:linear-gradient(90deg,transparent,rgba(var(--cat-rgb,0,208,102),0.35),transparent);
}
.back-btn {
  display:inline-flex; align-items:center; gap:8px;
  padding:9px 20px; margin-bottom:28px;
  background:rgba(255,255,255,0.04); border:1px solid var(--border);
  border-radius:50px; font-size:0.85rem; color:var(--text-2);
  position:relative; z-index:1;
  transition:all var(--transition);
}
.back-btn:hover {
  background:rgba(255,255,255,0.07); color:var(--text-1);
  border-color:var(--border-2); transform:translateX(-4px);
}
.concept-hero-content { position:relative; z-index:1; max-width:780px; }
.concept-cat-tag {
  display:inline-flex; align-items:center; gap:6px;
  padding:5px 14px; border-radius:20px;
  font-size:0.75rem; font-weight:700; letter-spacing:0.04em;
  border:1px solid rgba(var(--cat-rgb,0,208,102),0.25);
  margin-bottom:18px;
}
.concept-icon { font-size:3rem; margin-bottom:14px; }
.concept-title {
  font-size:clamp(2rem,4.5vw,3.4rem);
  font-weight:900; letter-spacing:-0.03em; line-height:1.05;
  margin-bottom:8px; color:var(--text-1);
}
.concept-subtitle {
  font-size:1.05rem; font-weight:600; margin-bottom:18px;
  color:var(--cat-color,var(--primary));
}
.concept-tags { display:flex; flex-wrap:wrap; gap:6px; }

/* ============================================================
   CONCEPT DETAIL – BODY
   ============================================================ */
.concept-body { padding:40px 40px 80px; }
.concept-grid {
  display:grid;
  grid-template-columns:1fr 320px;
  gap:32px; align-items:start;
}
.concept-main { display:flex; flex-direction:column; gap:22px; }

.concept-desc-card {
  background:rgba(var(--cat-rgb,0,208,102),0.04);
  border:1px solid rgba(var(--cat-rgb,0,208,102),0.15);
  border-radius:var(--radius); padding:26px 28px;
}
.concept-desc {
  font-size:1rem; color:var(--text-2); line-height:1.82;
}
.concept-svg-card {
  background:rgba(255,255,255,0.02);
  border:1px solid var(--border);
  border-radius:var(--radius); overflow:hidden;
}
.svg-wrap svg { width:100%; height:auto; display:block; }

.concept-section {
  background:rgba(255,255,255,0.02);
  border:1px solid var(--border);
  border-radius:var(--radius); padding:28px;
}
.section-header {
  display:flex; align-items:center; gap:12px;
  margin-bottom:16px; padding-bottom:14px;
  border-bottom:1px solid var(--border);
}
.section-icon {
  font-size:1.25rem; width:40px; height:40px; border-radius:10px; flex-shrink:0;
  background:rgba(var(--cat-rgb,0,208,102),0.1);
  border:1px solid rgba(var(--cat-rgb,0,208,102),0.18);
  display:flex; align-items:center; justify-content:center;
}
.section-title { font-size:1.1rem; font-weight:700; color:var(--text-1); }
.section-text { color:var(--text-2); font-size:0.92rem; line-height:1.82; }
.section-text + .section-text { margin-top:12px; }
.section-list {
  margin-top:12px; display:flex; flex-direction:column; gap:10px;
}
.section-list li {
  display:flex; gap:10px; align-items:flex-start;
  color:var(--text-2); font-size:0.9rem; line-height:1.7;
}
.section-list li::before {
  content:''; width:6px; height:6px; border-radius:50%;
  background:var(--cat-color,var(--primary));
  flex-shrink:0; margin-top:8px;
}
.section-steps {
  margin-top:12px; display:flex; flex-direction:column; gap:10px;
  list-style:none; padding:0; counter-reset:steps;
}
.section-steps li {
  display:flex; gap:12px; align-items:flex-start;
  color:var(--text-2); font-size:0.9rem; line-height:1.7;
  counter-increment:steps;
}
.section-steps li::before {
  content:counter(steps);
  min-width:26px; height:26px; border-radius:50%; flex-shrink:0;
  background:rgba(var(--cat-rgb,0,208,102),0.12);
  border:1px solid rgba(var(--cat-rgb,0,208,102),0.3);
  color:var(--cat-color,var(--primary));
  font-size:0.72rem; font-weight:800;
  display:flex; align-items:center; justify-content:center;
  margin-top:2px;
}

/* Sidebar */
.concept-sidebar {
  position:sticky; top:calc(var(--nav-h) + 20px);
  display:flex; flex-direction:column; gap:18px;
}
.sidebar-card {
  background:rgba(255,255,255,0.02);
  border:1px solid var(--border);
  border-radius:var(--radius); overflow:hidden;
}
.sidebar-title {
  padding:13px 18px;
  font-size:0.72rem; font-weight:700; letter-spacing:0.1em;
  text-transform:uppercase; color:var(--text-3);
  border-bottom:1px solid var(--border);
}
.facts-list { }
.fact-item {
  display:flex; justify-content:space-between; align-items:flex-start; gap:10px;
  padding:10px 18px; border-bottom:1px solid rgba(255,255,255,0.03);
  transition:background var(--transition);
}
.fact-item:last-child { border-bottom:none; }
.fact-item:hover { background:rgba(255,255,255,0.02); }
.fact-label { font-size:0.75rem; color:var(--text-3); font-weight:500; flex-shrink:0; max-width:48%; }
.fact-value { font-size:0.74rem; color:var(--text-1); text-align:right; font-family:ui-monospace,monospace; }
.related-list { padding:10px; display:flex; flex-direction:column; gap:7px; }
.related-item {
  display:flex; align-items:center; gap:9px;
  padding:9px 11px; border-radius:var(--radius-sm);
  background:rgba(255,255,255,0.02); border:1px solid var(--border);
  cursor:pointer; transition:all var(--transition);
}
.related-item:hover {
  background:rgba(var(--cat-rgb,0,208,102),0.05);
  border-color:rgba(var(--cat-rgb,0,208,102),0.2);
  transform:translateX(4px);
}
.related-item:focus-visible { outline:2px solid var(--primary); outline-offset:2px; }
.related-icon { font-size:1rem; flex-shrink:0; }
.related-item > div { flex:1; min-width:0; }
.related-name { font-size:0.8rem; font-weight:600; color:var(--text-1); white-space:nowrap; overflow:hidden; text-overflow:ellipsis; }
.related-sub  { font-size:0.68rem; color:var(--text-3); white-space:nowrap; overflow:hidden; text-overflow:ellipsis; }
.related-arrow { font-size:0.8rem; color:var(--text-3); flex-shrink:0; }

/* Difficulty badge */
.diff-badge {
  margin:14px 18px; padding:10px 16px; border-radius:var(--radius-sm);
  font-size:0.88rem; font-weight:600;
  display:flex; align-items:center; gap:8px;
}
.diff-einsteiger    { background:rgba(34,197,94,0.08);  border:1px solid rgba(34,197,94,0.25); color:#22c55e; }
.diff-fortgeschritten { background:rgba(249,115,22,0.08); border:1px solid rgba(249,115,22,0.25); color:#f97316; }
.diff-experte       { background:rgba(239,68,68,0.08);  border:1px solid rgba(239,68,68,0.25); color:#ef4444; }

/* ============================================================
   NOT FOUND
   ============================================================ */
.not-found {
  text-align:center; padding:120px 40px;
  display:flex; flex-direction:column; align-items:center; gap:16px;
}
.not-found-icon { font-size:4rem; }
.not-found h2 { font-size:1.5rem; font-weight:700; color:var(--text-1); }
.not-found p { color:var(--text-3); }
.btn-primary {
  margin-top:8px; padding:12px 28px;
  background:rgba(0,208,102,0.1); border:1px solid rgba(0,208,102,0.3);
  border-radius:50px; color:var(--primary); font-size:0.9rem; font-weight:600;
  cursor:pointer; transition:all var(--transition);
}
.btn-primary:hover {
  background:rgba(0,208,102,0.2); box-shadow:0 8px 30px rgba(0,208,102,0.2);
}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  position:relative; z-index:1;
  border-top:1px solid var(--border);
  padding:48px 40px;
  text-align:center;
}
.footer-brand { font-size:1.2rem; font-weight:800; margin-bottom:6px; }
.footer-brand em { font-style:normal; color:var(--primary); }
.footer-tag { color:var(--text-3); font-size:0.875rem; margin-bottom:14px; }
.footer-meta {
  display:flex; justify-content:center; align-items:center;
  gap:12px; font-size:0.78rem; color:var(--text-3); flex-wrap:wrap;
}
.footer-meta .sep { opacity:0.35; }

/* ============================================================
   ANIMATIONS
   ============================================================ */
@keyframes fadeDown {
  from { opacity:0; transform:translateY(-20px); }
  to   { opacity:1; transform:translateY(0); }
}
@keyframes fadeUp {
  from { opacity:0; transform:translateY(20px); }
  to   { opacity:1; transform:translateY(0); }
}
@keyframes fadeIn {
  from { opacity:0; }
  to   { opacity:1; }
}
@keyframes cardIn {
  from { opacity:0; transform:translateY(30px) scale(0.96); }
  to   { opacity:1; transform:translateY(0) scale(1); }
}
.reveal {
  opacity:0; transform:translateY(24px);
  transition:opacity 0.6s var(--ease),transform 0.6s var(--ease);
}
.reveal.visible { opacity:1; transform:translateY(0); }

/* ============================================================
   SCROLLBAR
   ============================================================ */
::-webkit-scrollbar { width:5px; }
::-webkit-scrollbar-track { background:transparent; }
::-webkit-scrollbar-thumb { background:rgba(255,255,255,0.1); border-radius:3px; }
::-webkit-scrollbar-thumb:hover { background:rgba(255,255,255,0.2); }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width:1280px) {
  .concept-grid { grid-template-columns:1fr 290px; }
}
@media (max-width:1024px) {
  .nav-inner { padding:0 24px; }
  .hero { padding:72px 24px 64px; }
  .hero-inner { gap:40px; }
  .search-section { padding:0 24px 32px; }
  .cards-section { padding:0 24px 64px; }
  .concept-grid { grid-template-columns:1fr; }
  .concept-sidebar { position:static; flex-direction:row; flex-wrap:wrap; }
  .sidebar-card { flex:1; min-width:240px; }
  .concept-body { padding:32px 24px 64px; }
  .concept-hero { padding:32px 24px 48px; }
}
@media (max-width:768px) {
  :root { --nav-h:60px; }
  .hero { padding:56px 20px 48px; }
  .hero-inner { flex-direction:column; text-align:center; }
  .hero-content { text-align:center; max-width:100%; }
  .hero-sub { margin:0 auto 44px; }
  .hero-stats { justify-content:center; }
  .hero-logo { width:clamp(160px,50vw,240px); height:clamp(160px,50vw,240px); }
  .hero-stats { gap:8px; }
  .stat-chip { padding:8px 12px; }
  .stat-label { display:none; }
  .search-section { padding:0 20px 28px; }
  .cards-section { padding:0 20px 56px; }
  .cards-grid { grid-template-columns:repeat(auto-fill,minmax(260px,1fr)); gap:14px; }
  .concept-hero { padding:24px 20px 40px; }
  .concept-body { padding:24px 20px 56px; }
  .concept-section { padding:20px; }
  .site-footer { padding:36px 20px; }
  .cat-filter { gap:6px; }
}
/* Bluehome Networks Branding */
.bluehome-link {
  color:var(--primary);
  font-weight:600;
  text-decoration:none;
  transition:opacity 0.2s;
}
.bluehome-link:hover { opacity:0.75; }
.hero-by {
  margin:16px 0 0;
  font-size:0.85rem;
  color:rgba(148,163,184,0.7);
  letter-spacing:0.01em;
}
.footer-legal {
  margin:14px 0 0;
  display:flex;
  align-items:center;
  justify-content:center;
  gap:10px;
}
.footer-legal-link {
  font-size:0.8rem;
  color:rgba(148,163,184,0.5);
  text-decoration:none;
  transition:color 0.2s;
}
.footer-legal-link:hover { color:var(--primary); }
.footer-legal .sep { color:rgba(148,163,184,0.3); font-size:0.8rem; }

/* ── Legal Pages ───────────────────────────────────────────── */
.legal-page {
  max-width:780px;
  margin:0 auto;
  padding:60px 40px 100px;
}
.legal-content { margin-top:32px; }
.legal-title {
  font-size:2rem;
  font-weight:800;
  color:var(--text);
  margin:0 0 40px;
}
.legal-content h2 {
  font-size:1.1rem;
  font-weight:700;
  color:var(--primary);
  margin:36px 0 10px;
  padding-bottom:6px;
  border-bottom:1px solid rgba(0,208,102,0.15);
}
.legal-content h3 {
  font-size:0.95rem;
  font-weight:600;
  color:var(--text);
  margin:20px 0 6px;
}
.legal-content p {
  font-size:0.9rem;
  color:var(--text-muted);
  line-height:1.75;
  margin:0 0 8px;
}
.legal-content a {
  color:var(--primary);
  text-decoration:none;
}
.legal-content a:hover { text-decoration:underline; }
.legal-content strong { color:var(--text); }

@media (max-width:600px) {
  .legal-page { padding:40px 20px 80px; }
  .legal-title { font-size:1.6rem; }
}

.footer-by {
  margin:6px 0 0;
  font-size:0.8rem;
  color:rgba(148,163,184,0.5);
}
.footer-by .bluehome-link { color:rgba(148,163,184,0.8); font-weight:500; }
.footer-by .bluehome-link:hover { opacity:0.9; color:var(--primary); }

/* ── Category Grid (Homepage) ──────────────────────────────── */
.categories-section {
  max-width:1200px;
  margin:0 auto;
  padding:20px 40px 80px;
}
.categories-header { text-align:center; margin-bottom:40px; }
.categories-title {
  font-size:1.8rem;
  font-weight:800;
  color:var(--text);
  margin:0 0 8px;
}
.categories-sub {
  color:var(--text-muted);
  font-size:0.95rem;
  margin:0;
}
.cat-grid {
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:20px;
}
.cat-card {
  position:relative;
  background:var(--card-bg);
  border:1px solid rgba(var(--cat-rgb),0.25);
  border-radius:16px;
  padding:32px 28px;
  cursor:pointer;
  transition:transform 0.22s ease, border-color 0.22s ease, box-shadow 0.22s ease;
  overflow:hidden;
  display:flex;
  flex-direction:column;
  gap:6px;
}
.cat-card:hover {
  transform:translateY(-4px);
  border-color:rgba(var(--cat-rgb),0.6);
  box-shadow:0 8px 32px rgba(var(--cat-rgb),0.15);
}
.cat-card:focus-visible {
  outline:2px solid var(--cat-color);
  outline-offset:2px;
}
.cat-card-glow {
  position:absolute;
  inset:0;
  background:radial-gradient(ellipse at top left, rgba(var(--cat-rgb),0.08) 0%, transparent 65%);
  pointer-events:none;
}
.cat-card-icon {
  font-size:2.4rem;
  line-height:1;
  margin-bottom:4px;
}
.cat-card-name {
  font-size:1.15rem;
  font-weight:700;
  color:var(--cat-color);
  margin:0;
}
.cat-card-count {
  font-size:0.8rem;
  font-weight:600;
  color:rgba(var(--cat-rgb),0.7);
  margin:0;
  text-transform:uppercase;
  letter-spacing:0.06em;
}
.cat-card-desc {
  font-size:0.85rem;
  color:var(--text-muted);
  line-height:1.5;
  margin:6px 0 0;
  flex:1;
}
.cat-card-arrow {
  display:inline-block;
  margin-top:14px;
  font-size:0.82rem;
  font-weight:600;
  color:var(--cat-color);
  opacity:0.7;
  transition:opacity 0.2s, transform 0.2s;
}
.cat-card:hover .cat-card-arrow {
  opacity:1;
  transform:translateX(4px);
}

/* ── Category Page Header ──────────────────────────────────── */
.cat-page-hero {
  position:relative;
  padding:80px 40px 60px;
  background:linear-gradient(135deg, rgba(var(--cat-rgb),0.08) 0%, transparent 60%);
  border-bottom:1px solid rgba(var(--cat-rgb),0.15);
  overflow:hidden;
}
.cat-page-header {
  max-width:1200px;
  margin:0 auto;
  text-align:center;
}
.cat-page-icon {
  font-size:3.5rem;
  line-height:1;
  margin-bottom:12px;
}
.cat-page-title {
  font-size:2.4rem;
  font-weight:800;
  color:var(--cat-color);
  margin:0 0 10px;
}
.cat-page-sub {
  font-size:0.95rem;
  color:var(--text-muted);
  max-width:560px;
  margin:0 auto;
  line-height:1.6;
}

@media (max-width:900px) {
  .cat-grid { grid-template-columns:repeat(2,1fr); }
}
@media (max-width:480px) {
  .cards-grid { grid-template-columns:1fr; }
  .hero-title { font-size:2.2rem; }
  .cat-count { display:none; }
  .concept-title { font-size:1.8rem; }
  .concept-sidebar { flex-direction:column; }
  .sidebar-card { min-width:unset; }
  .cat-grid { grid-template-columns:1fr; }
  .categories-section { padding:20px 20px 60px; }
  .cat-page-hero { padding:60px 20px 40px; }
  .cat-page-title { font-size:1.8rem; }
}