:root {
  --bg: #08090d;
  --text: #e2e6ef;
  --text2: #9ca6b8;
  --text3: #6d778a;
  --heading: #f8f9fc;
  --link: #7eb3dc;
  --link-hover: #a5cceb;
  --accent: #6b9fc4;
  --accent-fg: #0a0c10;
  --line: rgba(255, 255, 255, 0.08);
  --line-strong: rgba(255, 255, 255, 0.14);
  --glow-purple: rgba(153, 69, 255, 0.18);
  --glow-teal: rgba(20, 241, 149, 0.1);
  --font: "Outfit", system-ui, sans-serif;
  --font-display: "Fraunces", Georgia, serif;
  --max: 42rem;
  --wide: 56rem;
  color-scheme: dark;
}

html[data-theme="light"] {
  --bg: #f6f4f0;
  --text: #1a1d24;
  --text2: #525a6a;
  --text3: #7a8394;
  --heading: #0d0f14;
  --link: #2d5f8a;
  --link-hover: #1e4466;
  --accent: #2d4a66;
  --accent-fg: #ffffff;
  --line: rgba(0, 0, 0, 0.08);
  --line-strong: rgba(0, 0, 0, 0.12);
  --glow-purple: rgba(153, 69, 255, 0.1);
  --glow-teal: rgba(20, 160, 120, 0.08);
  color-scheme: light;
}

*, *::before, *::after { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  font-size: 17px;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  background:
    radial-gradient(ellipse 70% 55% at 85% -5%, var(--glow-purple), transparent 50%),
    radial-gradient(ellipse 50% 45% at 5% 95%, var(--glow-teal), transparent 45%);
}

a { color: var(--link); text-decoration: none; transition: color 0.2s ease; }
a:hover { color: var(--link-hover); }

.wrap {
  max-width: var(--wide);
  margin: 0 auto;
  padding: 0 clamp(20px, 4vw, 32px) 5rem;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(20px) saturate(1.2);
}

.site-header-inner {
  max-width: var(--wide);
  margin: 0 auto;
  padding: 14px clamp(20px, 4vw, 32px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.brand-logo-link,
.brand-text-link {
  text-decoration: none !important;
}

.brand-logo-link {
  flex-shrink: 0;
  line-height: 0;
  border-radius: 50%;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.brand-logo-link:hover {
  text-decoration: none !important;
  opacity: 0.88;
  transform: scale(1.03);
}

.brand-text-link:hover {
  text-decoration: none !important;
}

.brand-text-link:hover .brand-title {
  color: var(--link-hover);
}

.brand-logo {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
}

.brand-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--heading);
  letter-spacing: -0.01em;
}

.brand-tag {
  font-size: 12px;
  color: var(--text3);
  font-weight: 400;
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 2px 20px;
  align-items: center;
}

.site-nav a {
  font-size: 14px;
  color: var(--text2);
  text-decoration: none;
  font-weight: 450;
  padding: 4px 0;
  border-bottom: 2px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.site-nav a:hover {
  color: var(--heading);
  text-decoration: none;
}

.site-nav a.active {
  color: var(--heading);
  border-bottom-color: var(--accent);
  text-decoration: none;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 11px 20px;
  border-radius: 100px;
  font-size: 14px;
  font-weight: 500;
  font-family: var(--font);
  border: none;
  cursor: pointer;
  text-decoration: none !important;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.btn:hover {
  text-decoration: none !important;
  transform: translateY(-1px);
  opacity: 0.92;
}

.btn-primary {
  background: var(--heading);
  color: var(--bg);
}

html[data-theme="light"] .btn-primary {
  background: var(--accent);
  color: var(--accent-fg);
}

.btn-ghost {
  background: transparent;
  color: var(--text2);
  box-shadow: inset 0 0 0 1px var(--line-strong);
}

.btn-ghost:hover {
  color: var(--heading);
}

.theme-btn {
  width: 36px;
  height: 36px;
  padding: 0;
  border-radius: 50%;
  border: none;
  background: transparent;
  color: var(--text2);
  cursor: pointer;
  font-size: 15px;
  transition: color 0.2s ease;
}

.theme-btn:hover { color: var(--heading); }

/* Hero – open, no box */
.hero {
  max-width: var(--max);
  padding: clamp(2.5rem, 8vw, 4.5rem) 0 clamp(2rem, 5vw, 3rem);
}

.hero h1 {
  margin: 0 0 1.25rem;
  font-family: var(--font-display);
  font-size: clamp(2.25rem, 6vw, 3.25rem);
  font-weight: 500;
  line-height: 1.15;
  color: var(--heading);
  letter-spacing: -0.02em;
  font-optical-sizing: auto;
}

.hero-lead {
  font-size: clamp(1.05rem, 2.5vw, 1.2rem);
  color: var(--text2);
  margin: 0 0 2rem;
  max-width: 36em;
  line-height: 1.6;
  font-weight: 350;
}

.path-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* Flow sections */
.flow-section {
  max-width: var(--max);
  padding: 2.5rem 0;
  border-top: 1px solid var(--line);
}

.flow-section h2 {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 500;
  color: var(--heading);
  letter-spacing: -0.01em;
}

.flow-section p {
  margin: 0;
  font-size: 1.05rem;
  color: var(--text2);
  line-height: 1.65;
  max-width: 38em;
  font-weight: 350;
}

.flow-section strong {
  color: var(--heading);
  font-weight: 500;
}

/* Topic list – not cards */
.topic-list {
  list-style: none;
  margin: 0;
  padding: 0;
  max-width: var(--wide);
  border-top: 1px solid var(--line);
}

.topic-item {
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-rows: auto auto;
  gap: 4px 16px;
  padding: 1.35rem 0;
  border-bottom: 1px solid var(--line);
  text-decoration: none !important;
  transition: padding-left 0.25s ease;
}

.topic-item:hover {
  text-decoration: none !important;
  padding-left: 6px;
}

.topic-item:hover .topic-title { color: var(--link-hover); }

.topic-title {
  grid-column: 1;
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--heading);
  transition: color 0.2s ease;
}

.topic-desc {
  grid-column: 1;
  font-size: 0.95rem;
  color: var(--text2);
  line-height: 1.5;
  font-weight: 350;
  max-width: 36em;
}

.topic-arrow {
  grid-column: 2;
  grid-row: 1 / span 2;
  align-self: center;
  font-size: 1.25rem;
  color: var(--text3);
  transition: transform 0.25s ease, color 0.2s ease;
}

.topic-item:hover .topic-arrow {
  transform: translateX(4px);
  color: var(--link);
}

.quote-soft {
  max-width: var(--max);
  margin: 2.5rem 0 0;
  padding: 0;
  border: none;
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-style: italic;
  font-weight: 400;
  color: var(--text2);
  line-height: 1.5;
}

/* Learning path */
.path-flow {
  max-width: var(--max);
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--line);
}

.path-flow-title {
  margin: 0 0 1.25rem;
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text3);
}

.path-steps {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: path;
}

.path-steps li {
  counter-increment: path;
  position: relative;
  padding: 0.85rem 0 0.85rem 2.5rem;
  border-bottom: 1px solid var(--line);
  font-size: 0.98rem;
  color: var(--text2);
  font-weight: 350;
}

.path-steps li:last-child { border-bottom: none; }

.path-steps li::before {
  content: counter(path);
  position: absolute;
  left: 0;
  top: 0.85rem;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text3);
  font-variant-numeric: tabular-nums;
}

.path-steps a {
  color: var(--heading);
  font-weight: 500;
}

.path-steps a:hover { color: var(--link); text-decoration: none; }

/* Article pages */
.prose-panel {
  max-width: var(--max);
  margin-top: clamp(1.5rem, 4vw, 2.5rem);
  padding: 0 0 2rem;
}

.prose h1 {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(1.85rem, 5vw, 2.5rem);
  font-weight: 500;
  color: var(--heading);
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.prose-lead {
  font-size: 1.1rem;
  color: var(--text2);
  margin: 0 0 2rem;
  line-height: 1.6;
  font-weight: 350;
}

.prose h2 {
  margin: 2.5rem 0 0.75rem;
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--heading);
}

.prose h3 {
  margin: 1.75rem 0 0.5rem;
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--heading);
}

.prose p, .prose li {
  color: var(--text2);
  font-size: 1rem;
  line-height: 1.65;
  font-weight: 350;
}

.prose ul, .prose ol {
  padding-left: 1.2em;
  margin: 0 0 1.25rem;
}

.prose li { margin-bottom: 0.4rem; }

.prose strong { color: var(--heading); font-weight: 500; }

.prose blockquote {
  margin: 1.75rem 0;
  padding: 0;
  border: none;
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-style: italic;
  color: var(--text2);
}

.callout {
  margin: 2rem 0;
  padding: 1.25rem 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: none;
}

.callout strong {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--heading);
  font-weight: 500;
}

.callout-warn {
  border-color: color-mix(in srgb, #e85 30%, var(--line));
}

.callout ol, .callout ul {
  margin: 0;
  padding-left: 1.2em;
  color: var(--text2);
  font-size: 0.95rem;
}

.step-list {
  counter-reset: step;
  list-style: none;
  padding: 0;
  margin: 1.5rem 0;
}

.step-list li {
  counter-increment: step;
  position: relative;
  padding: 1rem 0 1rem 2.25rem;
  border-bottom: 1px solid var(--line);
  color: var(--text2);
  font-size: 1rem;
  line-height: 1.6;
  font-weight: 350;
}

.step-list li::before {
  content: counter(step) ".";
  position: absolute;
  left: 0;
  top: 1rem;
  font-weight: 500;
  color: var(--text3);
  font-size: 0.9rem;
}

.prose .path-row { margin-top: 2.5rem; }

/* Footer */
.site-footer {
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid var(--line);
  font-size: 13px;
  color: var(--text3);
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 1.25rem;
}

.footer-logo-link {
  flex-shrink: 0;
  line-height: 0;
  text-decoration: none !important;
  border-radius: 50%;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.footer-logo-link:hover {
  text-decoration: none !important;
  opacity: 0.88;
  transform: scale(1.03);
}

.footer-logo-link img {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  object-fit: cover;
  display: block;
}

.footer-brand-text {
  min-width: 0;
}

.footer-title-link {
  display: block;
  text-decoration: none !important;
}

.footer-title-link:hover {
  text-decoration: none !important;
}

.footer-title-link strong {
  color: var(--heading);
  font-size: 14px;
  font-weight: 500;
  transition: color 0.2s ease;
}

.footer-title-link:hover strong {
  color: var(--link-hover);
}

.footer-brand span {
  display: block;
  font-size: 12px;
  color: var(--text3);
  margin-top: 2px;
}

.site-footer a { color: var(--text2); }

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin-bottom: 1rem;
}

.footer-note {
  margin: 0;
  font-size: 12px;
  color: var(--text3);
  font-weight: 350;
}

@media (max-width: 720px) {
  .brand-tag { display: none; }
  .site-nav {
    width: 100%;
    order: 3;
    gap: 4px 16px;
  }
  .header-actions { margin-left: auto; }
  .topic-item {
    grid-template-columns: 1fr;
  }
  .topic-arrow {
    display: none;
  }
}