:root {
  --bg: #0b1020;
  --panel: rgba(255,255,255,0.06);
  --panel2: rgba(255,255,255,0.10);
  --text: rgba(255,255,255,0.92);
  --muted: rgba(255,255,255,0.72);
  --muted2: rgba(255,255,255,0.60);
  --border: rgba(255,255,255,0.14);
  --shadow: 0 18px 45px rgba(0,0,0,0.45);
  --brand: #7c3aed;
  --brand2: #22c55e;
  --warn: #f59e0b;
  --danger: #ef4444;
  --radius: 18px;
  --radius2: 26px;
  --maxw: 1140px;
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  --sans: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
  margin: 0;
  font-family: var(--sans);
  color: var(--text);
  background: radial-gradient(1200px 600px at 20% 10%, rgba(124,58,237,0.28), transparent 60%),
              radial-gradient(1100px 700px at 80% 15%, rgba(34,197,94,0.20), transparent 60%),
              radial-gradient(900px 600px at 50% 110%, rgba(245,158,11,0.12), transparent 55%),
              var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: inherit; text-decoration: none; }
a:focus-visible, button:focus-visible, summary:focus-visible, input:focus-visible {
  outline: 3px solid rgba(124,58,237,0.65);
  outline-offset: 3px;
  border-radius: 10px;
}

.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 18px;
}

/* Navigation */
.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(10px);
  background: linear-gradient(to bottom, rgba(11,16,32,0.85), rgba(11,16,32,0.55));
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
  gap: 14px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 200px;
}

.logo {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(124,58,237,0.95), rgba(34,197,94,0.80));
  box-shadow: 0 10px 24px rgba(0,0,0,0.35);
  display: grid;
  place-items: center;
  font-family: var(--mono);
  font-weight: 800;
  letter-spacing: -1px;
  flex-shrink: 0;
}

.brand-title {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.brand-title strong { font-size: 14px; letter-spacing: 0.2px; }
.brand-title span { font-size: 12px; color: var(--muted2); }

.nav-links {
  display: none;
  gap: 18px;
  color: var(--muted);
  font-size: 14px;
}

.nav-links a {
  padding: 8px 10px;
  border-radius: 12px;
  border: 1px solid transparent;
  transition: color 120ms ease, border-color 120ms ease, background 120ms ease;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text);
  border-color: rgba(255,255,255,0.12);
  background: rgba(255,255,255,0.04);
}

.nav-actions {
  display: flex;
  gap: 10px;
  align-items: center;
}

.mobile-menu-btn {
  display: flex;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 9px 8px;
  cursor: pointer;
}

.mobile-menu-btn span {
  width: 18px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 200ms ease, opacity 200ms ease;
}

.mobile-menu-btn[aria-expanded="true"] span:nth-child(1) {
  transform: rotate(45deg) translate(3px, 4px);
}
.mobile-menu-btn[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}
.mobile-menu-btn[aria-expanded="true"] span:nth-child(3) {
  transform: rotate(-45deg) translate(3px, -4px);
}

.mobile-nav {
  display: none;
  flex-direction: column;
  gap: 4px;
  padding: 10px 0 14px;
  border-top: 1px solid var(--border);
}

.mobile-nav.open {
  display: flex;
}

.mobile-nav a {
  padding: 10px 12px;
  border-radius: 12px;
  color: var(--muted);
  font-size: 14px;
  transition: color 120ms ease, background 120ms ease;
}

.mobile-nav a:hover,
.mobile-nav a.active {
  color: var(--text);
  background: rgba(255,255,255,0.04);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: 14px;
  border: 1px solid rgba(255,255,255,0.12);
  background: rgba(255,255,255,0.04);
  color: var(--text);
  font-weight: 650;
  font-size: 14px;
  cursor: pointer;
  transition: transform 120ms ease, background 120ms ease, border-color 120ms ease;
  user-select: none;
  font-family: var(--sans);
}

.btn:hover {
  transform: translateY(-1px);
  border-color: rgba(255,255,255,0.18);
  background: rgba(255,255,255,0.06);
}

.btn-primary {
  background: linear-gradient(135deg, rgba(124,58,237,0.95), rgba(124,58,237,0.70));
  border-color: rgba(124,58,237,0.40);
  box-shadow: 0 18px 40px rgba(124,58,237,0.22);
}

.btn-primary:hover {
  background: linear-gradient(135deg, rgba(124,58,237,1.0), rgba(124,58,237,0.78));
}

.btn-ghost {
  background: transparent;
  border-color: rgba(255,255,255,0.12);
  color: var(--muted);
}

.btn-sm {
  padding: 8px 12px;
  font-size: 13px;
  border-radius: 12px;
}

.btn-lg {
  padding: 14px 22px;
  font-size: 15px;
}

/* Hero */
.hero {
  padding: 58px 0 30px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
  align-items: start;
}

.hero h1 {
  margin: 0;
  font-size: clamp(30px, 4.2vw, 52px);
  letter-spacing: -0.8px;
  line-height: 1.08;
}

.hero p {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.6;
  max-width: 58ch;
}

.hero-badges {
  margin-top: 18px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  color: var(--muted);
  font-size: 13px;
}

.badge {
  padding: 8px 10px;
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 999px;
  background: rgba(255,255,255,0.04);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.dot {
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: rgba(255,255,255,0.35);
}

.dot.green { background: rgba(34,197,94,0.85); }
.dot.purple { background: rgba(124,58,237,0.90); }
.dot.orange { background: rgba(245,158,11,0.92); }

.hero-cta {
  margin-top: 22px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.mini {
  color: var(--muted2);
  font-size: 12px;
  line-height: 1.4;
  margin-top: 10px;
  max-width: 64ch;
}

/* Panels & Cards */
.panel {
  border: 1px solid var(--border);
  background: linear-gradient(to bottom right, rgba(255,255,255,0.07), rgba(255,255,255,0.03));
  border-radius: var(--radius2);
  box-shadow: var(--shadow);
}

.hero-card {
  padding: 16px;
  overflow: hidden;
  position: relative;
}

.hero-card::before {
  content: "";
  position: absolute;
  inset: -80px -140px auto auto;
  width: 320px;
  height: 320px;
  background: radial-gradient(circle at 30% 30%, rgba(124,58,237,0.55), transparent 60%);
  opacity: 0.9;
  pointer-events: none;
}

.hero-card::after {
  content: "";
  position: absolute;
  inset: auto auto -140px -130px;
  width: 360px;
  height: 360px;
  background: radial-gradient(circle at 30% 30%, rgba(34,197,94,0.40), transparent 60%);
  opacity: 0.8;
  pointer-events: none;
}

.card-inner {
  position: relative;
  z-index: 1;
}

.codebox {
  border-radius: var(--radius);
  border: 1px solid rgba(255,255,255,0.14);
  background: rgba(0,0,0,0.28);
  padding: 14px;
  font-family: var(--mono);
  font-size: 12.5px;
  line-height: 1.55;
  color: rgba(255,255,255,0.86);
  overflow: auto;
}

.codebox .line { display: block; }
.kw { color: rgba(124,58,237,0.95); }
.fn { color: rgba(34,197,94,0.95); }
.cm { color: rgba(255,255,255,0.55); }
.st { color: rgba(245,158,11,0.95); }

/* Sections */
.section {
  padding: 28px 0;
}

.section h2 {
  margin: 0 0 10px;
  font-size: clamp(22px, 2.4vw, 34px);
  letter-spacing: -0.4px;
}

.section p.lead {
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
  max-width: 78ch;
}

/* Grid */
.grid {
  margin-top: 18px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.card {
  padding: 16px;
  border-radius: var(--radius2);
  border: 1px solid rgba(255,255,255,0.12);
  background: rgba(255,255,255,0.04);
  transition: border-color 200ms ease, background 200ms ease;
}

.card:hover {
  border-color: rgba(124,58,237,0.35);
  background: rgba(255,255,255,0.06);
}

.card h3 {
  margin: 0 0 8px;
  font-size: 16px;
  letter-spacing: -0.2px;
}

.card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
  font-size: 14.5px;
}

.card-link {
  display: block;
  text-decoration: none;
  color: inherit;
}

.card-link .card-arrow {
  display: inline-block;
  margin-top: 10px;
  font-size: 13px;
  color: var(--brand);
  font-weight: 600;
  transition: transform 200ms ease;
}

.card-link:hover .card-arrow {
  transform: translateX(4px);
}

.meta {
  margin-top: 10px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  color: var(--muted2);
  font-size: 12px;
}

.pill {
  padding: 7px 10px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,0.12);
  background: rgba(255,255,255,0.03);
}

/* Two Column Layout */
.two-col {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 18px;
}

/* Lists */
.list {
  margin: 10px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 12px;
  border-radius: var(--radius);
  border: 1px solid rgba(255,255,255,0.12);
  background: rgba(255,255,255,0.03);
}

.icon {
  width: 34px;
  height: 34px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(255,255,255,0.14);
  background: rgba(255,255,255,0.04);
  flex: 0 0 auto;
  font-size: 16px;
}

.li strong {
  display: block;
  font-size: 14px;
  margin-bottom: 2px;
}

.li span {
  display: block;
  color: var(--muted);
  font-size: 13.5px;
  line-height: 1.55;
}

/* CTA Banner */
.cta-banner {
  margin-top: 16px;
  padding: 16px;
  border-radius: var(--radius2);
  border: 1px solid rgba(255,255,255,0.14);
  background: linear-gradient(135deg, rgba(124,58,237,0.22), rgba(34,197,94,0.12));
}

.cta-banner h3 {
  margin: 0 0 8px;
  font-size: 16px;
}

.cta-banner p { margin: 0; color: var(--muted); line-height: 1.6; }

/* FAQ */
details {
  border: 1px solid rgba(255,255,255,0.12);
  background: rgba(255,255,255,0.03);
  border-radius: var(--radius2);
  padding: 12px 14px;
}

details + details { margin-top: 10px; }

summary {
  cursor: pointer;
  font-weight: 700;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 6px 2px;
}

summary::-webkit-details-marker { display: none; }

.faq-a {
  color: var(--muted);
  line-height: 1.65;
  margin: 8px 0 0;
  font-size: 14.5px;
}

.chev {
  width: 28px;
  height: 28px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(255,255,255,0.12);
  background: rgba(255,255,255,0.03);
  flex: 0 0 auto;
  font-size: 14px;
  transition: transform 200ms ease;
}

details[open] .chev {
  transform: rotate(180deg);
}

/* Footer */
.footer {
  padding: 28px 0 46px;
  color: var(--muted2);
  font-size: 12.5px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 14px;
}

.fine {
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius2);
  padding: 14px;
  background: rgba(255,255,255,0.03);
}

.fine a {
  color: rgba(255,255,255,0.85);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.fine a:hover {
  color: var(--text);
}

/* Breadcrumb */
.breadcrumb {
  padding: 14px 0 0;
  font-size: 13px;
  color: var(--muted2);
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}

.breadcrumb a {
  color: var(--muted);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.breadcrumb a:hover { color: var(--text); }

.breadcrumb .sep { opacity: 0.5; }

/* Subpage Hero */
.subpage-hero {
  padding: 32px 0 20px;
}

.subpage-hero h1 {
  margin: 0;
  font-size: clamp(26px, 3.2vw, 42px);
  letter-spacing: -0.6px;
  line-height: 1.12;
}

.subpage-hero p {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.6;
  max-width: 72ch;
}

/* Content blocks for subpages */
.content-block {
  margin-top: 28px;
}

.content-block h2 {
  margin: 0 0 12px;
  font-size: clamp(20px, 2.2vw, 28px);
  letter-spacing: -0.3px;
}

.content-block p {
  margin: 0 0 12px;
  color: var(--muted);
  line-height: 1.7;
  font-size: 15px;
  max-width: 78ch;
}

.content-block ul {
  margin: 0 0 14px;
  padding: 0 0 0 20px;
  color: var(--muted);
  line-height: 1.7;
  font-size: 15px;
}

.content-block li {
  margin-bottom: 6px;
}

/* Course / Affiliate Cards */
.course-grid {
  margin-top: 18px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.course-card {
  padding: 18px;
  border-radius: var(--radius2);
  border: 1px solid rgba(255,255,255,0.12);
  background: rgba(255,255,255,0.04);
  transition: border-color 200ms ease, transform 200ms ease;
}

.course-card:hover {
  border-color: rgba(124,58,237,0.35);
  transform: translateY(-2px);
}

.course-card h3 {
  margin: 0 0 8px;
  font-size: 17px;
  letter-spacing: -0.2px;
}

.course-card p {
  margin: 0 0 12px;
  color: var(--muted);
  line-height: 1.6;
  font-size: 14.5px;
}

.course-card .btn {
  margin-top: 4px;
}

/* Counter Display */
.counter-display {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,0.10);
  background: rgba(255,255,255,0.03);
  font-size: 12px;
  color: var(--muted2);
  margin-top: 14px;
}

.counter-display .counter-dot {
  width: 6px;
  height: 6px;
  border-radius: 999px;
  background: var(--brand2);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* Newsletter Messages */
.newsletter-msg {
  padding: 12px 14px;
  border-radius: 14px;
  margin-bottom: 14px;
  font-size: 14px;
  line-height: 1.5;
}

.newsletter-msg.success {
  background: rgba(34,197,94,0.15);
  border: 1px solid rgba(34,197,94,0.30);
  color: rgba(34,197,94,0.95);
}

.newsletter-msg.info {
  background: rgba(245,158,11,0.15);
  border: 1px solid rgba(245,158,11,0.30);
  color: rgba(245,158,11,0.95);
}

.newsletter-msg.error {
  background: rgba(239,68,68,0.15);
  border: 1px solid rgba(239,68,68,0.30);
  color: rgba(239,68,68,0.95);
}

/* Form inputs */
.form-input {
  width: 100%;
  padding: 12px 12px;
  border-radius: 14px;
  border: 1px solid rgba(255,255,255,0.14);
  background: rgba(0,0,0,0.25);
  color: var(--text);
  font-size: 14px;
  font-family: var(--sans);
  transition: border-color 150ms ease;
}

.form-input:focus {
  border-color: rgba(124,58,237,0.50);
}

.form-input::placeholder {
  color: var(--muted2);
}

.form-label {
  display: block;
  font-size: 13px;
  color: var(--muted2);
  margin-bottom: 6px;
}

/* Related pages */
.related-grid {
  margin-top: 18px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.related-card {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px;
  border-radius: var(--radius);
  border: 1px solid rgba(255,255,255,0.12);
  background: rgba(255,255,255,0.03);
  transition: border-color 200ms ease, background 200ms ease;
  text-decoration: none;
  color: inherit;
}

.related-card:hover {
  border-color: rgba(124,58,237,0.30);
  background: rgba(255,255,255,0.05);
}

.related-card .related-icon {
  width: 38px;
  height: 38px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(255,255,255,0.14);
  background: rgba(124,58,237,0.12);
  flex: 0 0 auto;
  font-size: 18px;
}

.related-card strong {
  font-size: 14px;
}

.related-card span {
  display: block;
  color: var(--muted);
  font-size: 13px;
  margin-top: 2px;
}

/* Responsive */
@media (min-width: 640px) {
  .course-grid { grid-template-columns: repeat(2, 1fr); }
  .related-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 860px) {
  .nav-links { display: flex; }
  .mobile-menu-btn { display: none; }
  .hero-grid { grid-template-columns: 1.15fr 0.85fr; gap: 22px; }
  .grid { grid-template-columns: repeat(3, 1fr); }
  .two-col { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1.4fr 0.6fr 0.6fr; }
  .course-grid { grid-template-columns: repeat(3, 1fr); }
  .related-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (prefers-reduced-motion: reduce) {
  .btn, .card, .course-card { transition: none; }
  .btn:hover, .course-card:hover { transform: none; }
  .counter-display .counter-dot { animation: none; }
}

@media print {
  .nav, .hero-cta, .nav-actions, .mobile-menu-btn { display: none !important; }
  body { background: #fff; color: #222; }
  .card, .panel, .fine, .course-card { border-color: #ccc; background: #f9f9f9; }
}