:root {
  --canvas: #010102;
  --surface-1: #0f1011;
  --surface-2: #141516;
  --surface-3: #18191a;
  --hairline: #23252a;
  --hairline-strong: #34343a;
  --accent: #5e6ad2;
  --accent-hover: #828fff;
  --accent-focus: #5e69d1;
  --ink: #f7f8f8;
  --ink-muted: #d0d6e0;
  --ink-subtle: #8a8f98;
  --ink-tertiary: #62666d;
  --radius-xs: 4px;
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-pill: 9999px;
  --nav-h: 64px;
  --max-w: 1280px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  background: var(--canvas);
  color: var(--ink);
  font-family: 'SF Pro Display', -apple-system, system-ui, 'Segoe UI', Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  padding-top: var(--nav-h);
}

a { color: var(--ink); text-decoration: none; transition: color 150ms ease; }
a:hover { color: var(--accent-hover); }

img { display: block; max-width: 100%; height: auto; }

.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 32px;
}

@media (max-width: 600px) { .container { padding: 0 16px; } }

/* ─── HEADER ─── */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: var(--nav-h);
  background: rgba(1,1,2,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--hairline);
  display: flex;
  align-items: center;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.site-logo {
  display: flex;
  flex-direction: column;
  gap: 1px;
  text-decoration: none;
}

.logo-wordmark {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.4px;
  color: var(--ink);
  line-height: 1.2;
}

.logo-tagline {
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.4px;
  color: var(--ink-subtle);
  text-transform: uppercase;
  line-height: 1;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.site-nav a {
  font-size: 14px;
  font-weight: 400;
  color: var(--ink-subtle);
  letter-spacing: 0;
  transition: color 150ms ease;
  padding: 4px 0;
}

.site-nav a:hover,
.site-nav a.active { color: var(--ink); }

.burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 8px;
  margin: -8px;
}

.burger span {
  display: block;
  width: 20px;
  height: 1.5px;
  background: var(--ink);
  border-radius: 1px;
  transition: transform 280ms ease, opacity 280ms ease;
}

.burger.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.burger.open span:nth-child(2) { opacity: 0; }
.burger.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

.mobile-nav {
  display: none;
  position: fixed;
  top: var(--nav-h); left: 0; right: 0; bottom: 0;
  background: var(--canvas);
  z-index: 99;
  padding: 32px;
  flex-direction: column;
  border-top: 1px solid var(--hairline);
  overflow-y: auto;
}

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

.mobile-nav a {
  display: block;
  font-size: 18px;
  font-weight: 500;
  letter-spacing: -0.3px;
  color: var(--ink);
  padding: 16px 0;
  border-bottom: 1px solid var(--hairline);
}

.mobile-nav a:hover { color: var(--accent-hover); }

/* ─── BREADCRUMB ─── */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 16px 0;
  font-size: 12px;
  color: var(--ink-subtle);
  flex-wrap: wrap;
}

.breadcrumb a { color: var(--ink-subtle); }
.breadcrumb a:hover { color: var(--accent-hover); }
.breadcrumb span { color: var(--hairline-strong); }

/* ─── HERO / COMPARISON LEAD ─── */
.hero {
  padding: 56px 0 48px;
  border-bottom: 1px solid var(--hairline);
}

.hero-eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.4px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
}

.comparison-lead {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

@media (min-width: 768px) {
  .comparison-lead {
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: start;
  }
}

.hero-title {
  font-size: clamp(32px, 4.5vw, 56px);
  font-weight: 600;
  letter-spacing: -1.5px;
  line-height: 1.08;
  color: var(--ink);
  margin-bottom: 16px;
}

.hero-subtitle {
  font-size: 18px;
  font-weight: 400;
  color: var(--ink-muted);
  line-height: 1.5;
  letter-spacing: -0.1px;
  margin-bottom: 28px;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.meta-chip {
  display: inline-flex;
  align-items: center;
  background: var(--surface-1);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-pill);
  padding: 3px 10px;
  font-size: 12px;
  color: var(--ink-muted);
  letter-spacing: 0;
}

.meta-chip.accent-chip {
  background: rgba(94,106,210,0.12);
  border-color: rgba(94,106,210,0.3);
  color: var(--accent-hover);
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--accent);
  color: #ffffff;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0;
  padding: 8px 16px;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: background 150ms ease;
  margin-top: 4px;
}

.btn-primary:hover { background: var(--accent-hover); color: #fff; }

.hero-img-panel {
  background: var(--surface-1);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-xl);
  overflow: hidden;
  aspect-ratio: 4/3;
}

.hero-img-panel img {
  width: 100%; height: 100%;
  object-fit: cover;
}

/* ─── SECTION HEADER ─── */
.section-head {
  padding: 48px 0 24px;
}

.section-head h2 {
  font-size: 28px;
  font-weight: 600;
  letter-spacing: -0.6px;
  color: var(--ink);
  line-height: 1.2;
  margin-bottom: 6px;
}

.section-head p {
  font-size: 15px;
  color: var(--ink-subtle);
  line-height: 1.5;
}

/* ─── CARD GRID ─── */
.cards-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-bottom: 48px;
}

@media (min-width: 600px) {
  .cards-grid { grid-template-columns: 1fr 1fr; }
}

@media (min-width: 1024px) {
  .cards-grid { grid-template-columns: repeat(3, 1fr); }
}

.case-card {
  background: var(--surface-1);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  text-decoration: none;
  transition: background 150ms ease, border-color 150ms ease;
}

.case-card:hover {
  background: var(--surface-2);
  border-color: var(--hairline-strong);
}

.case-card:hover .card-title { color: var(--accent-hover); }

.card-eyebrow {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.4px;
  text-transform: uppercase;
  color: var(--accent);
}

.card-title {
  font-size: 18px;
  font-weight: 500;
  letter-spacing: -0.3px;
  color: var(--ink);
  line-height: 1.3;
  transition: color 150ms ease;
}

.card-excerpt {
  font-size: 14px;
  color: var(--ink-subtle);
  line-height: 1.5;
  flex: 1;
}

.card-footer-meta {
  font-size: 12px;
  color: var(--ink-tertiary);
  margin-top: auto;
  padding-top: 12px;
  border-top: 1px solid var(--hairline);
}

.card-img {
  border-radius: var(--radius-md);
  overflow: hidden;
  aspect-ratio: 16/9;
  background: var(--surface-2);
  margin-bottom: 4px;
}

.card-img img {
  width: 100%; height: 100%;
  object-fit: cover;
}

/* ─── FEATURED CARD ─── */
.featured-card {
  background: var(--surface-2);
  border: 1px solid var(--hairline-strong);
}

/* ─── COMPACT STRIP ─── */
.compact-strip {
  border-top: 1px solid var(--hairline);
  padding: 32px 0 48px;
}

.compact-strip h2 {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.4px;
  color: var(--ink);
  margin-bottom: 20px;
}

.strip-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.strip-item {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 14px 0;
  border-bottom: 1px solid var(--hairline);
  text-decoration: none;
  transition: background 150ms ease;
}

.strip-item:hover .strip-title { color: var(--accent-hover); }

.strip-num {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  background: var(--surface-1);
  border: 1px solid var(--hairline);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 500;
  color: var(--ink-subtle);
}

.strip-body { flex: 1; }

.strip-cat {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.4px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 2px;
}

.strip-title {
  font-size: 15px;
  font-weight: 500;
  color: var(--ink);
  line-height: 1.3;
  transition: color 150ms ease;
  letter-spacing: -0.1px;
}

.strip-meta {
  font-size: 12px;
  color: var(--ink-tertiary);
  flex-shrink: 0;
}

/* ─── ARTICLE LAYOUT ─── */
.article-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  padding: 40px 0 80px;
}

@media (min-width: 1024px) {
  .article-layout {
    grid-template-columns: 200px 1fr;
    align-items: start;
  }
}

.article-sidebar {
  position: sticky;
  top: calc(var(--nav-h) + 20px);
}

.toc-panel {
  background: var(--surface-1);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  padding: 20px;
}

.toc-panel h3 {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.4px;
  text-transform: uppercase;
  color: var(--ink-subtle);
  margin-bottom: 14px;
}

.toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.toc-list li a {
  font-size: 13px;
  color: var(--ink-subtle);
  display: block;
  padding: 5px 8px;
  border-radius: var(--radius-xs);
  transition: background 120ms ease, color 120ms ease;
  letter-spacing: -0.05px;
}

.toc-list li a:hover {
  background: var(--surface-2);
  color: var(--ink);
}

.article-header { margin-bottom: 32px; }

.article-eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.4px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
}

.article-title {
  font-size: clamp(28px, 4vw, 48px);
  font-weight: 600;
  letter-spacing: -1.2px;
  line-height: 1.1;
  color: var(--ink);
  margin-bottom: 18px;
}

.article-meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 14px 0;
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
  margin-bottom: 24px;
}

.article-summary {
  background: var(--surface-1);
  border-left: 2px solid var(--accent);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 18px 20px;
  margin-bottom: 28px;
}

.article-summary p {
  font-size: 16px;
  color: var(--ink-muted);
  line-height: 1.6;
  letter-spacing: -0.05px;
}

.article-hero-img {
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid var(--hairline);
  margin-bottom: 32px;
  aspect-ratio: 16/9;
  background: var(--surface-1);
}

.article-hero-img img {
  width: 100%; height: 100%;
  object-fit: cover;
}

.article-body h2 {
  font-size: clamp(20px, 2.5vw, 28px);
  font-weight: 600;
  letter-spacing: -0.6px;
  color: var(--ink);
  margin: 40px 0 14px;
  padding-top: 8px;
  border-top: 1px solid var(--hairline);
  line-height: 1.2;
}

.article-body h3 {
  font-size: 18px;
  font-weight: 500;
  letter-spacing: -0.3px;
  color: var(--ink);
  margin: 28px 0 10px;
}

.article-body p {
  font-size: 16px;
  color: var(--ink-muted);
  line-height: 1.7;
  margin-bottom: 16px;
  letter-spacing: -0.05px;
}

.article-body ul, .article-body ol {
  padding-left: 22px;
  margin-bottom: 16px;
}

.article-body li {
  font-size: 16px;
  color: var(--ink-muted);
  line-height: 1.65;
  margin-bottom: 6px;
}

.inline-img {
  margin: 28px 0;
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid var(--hairline);
  background: var(--surface-1);
}

.inline-img img {
  width: 100%;
  aspect-ratio: 16/9;
  object-fit: cover;
}

.img-caption {
  padding: 10px 16px;
  background: var(--surface-1);
  font-size: 12px;
  color: var(--ink-subtle);
  letter-spacing: 0;
  border-top: 1px solid var(--hairline);
}

.key-context {
  background: var(--surface-1);
  border: 1px solid var(--hairline);
  border-left: 2px solid var(--accent);
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
  padding: 20px 24px;
  margin: 28px 0;
}

.key-context h3 {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.4px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}

.key-context ul { padding-left: 18px; }
.key-context li {
  font-size: 15px;
  color: var(--ink-muted);
  line-height: 1.6;
  margin-bottom: 8px;
}

.not-covered {
  background: var(--surface-1);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  margin: 36px 0;
}

.not-covered h3 {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.4px;
  text-transform: uppercase;
  color: var(--ink-subtle);
  margin-bottom: 12px;
}

.not-covered ul { padding-left: 18px; }
.not-covered li {
  font-size: 14px;
  color: var(--ink-subtle);
  line-height: 1.6;
  margin-bottom: 6px;
}

.related-articles {
  border-top: 1px solid var(--hairline);
  padding-top: 36px;
  margin-top: 36px;
}

.related-articles h2 {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.4px;
  color: var(--ink);
  margin-bottom: 20px;
}

.related-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

@media (min-width: 600px) {
  .related-grid { grid-template-columns: 1fr 1fr; }
}

/* ─── STATIC PAGES ─── */
.page-hero {
  padding: 52px 0 36px;
  border-bottom: 1px solid var(--hairline);
}

.page-title {
  font-size: clamp(32px, 5vw, 56px);
  font-weight: 600;
  letter-spacing: -1.5px;
  line-height: 1.08;
  color: var(--ink);
  margin-bottom: 12px;
}

.page-subtitle {
  font-size: 16px;
  color: var(--ink-subtle);
  max-width: 560px;
  line-height: 1.5;
  letter-spacing: -0.05px;
}

.page-content {
  max-width: 700px;
  padding: 40px 0 80px;
}

.page-content h2 {
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.4px;
  color: var(--ink);
  margin: 32px 0 12px;
  padding-top: 4px;
}

.page-content h3 {
  font-size: 17px;
  font-weight: 500;
  color: var(--ink);
  margin: 22px 0 8px;
}

.page-content p {
  font-size: 16px;
  color: var(--ink-muted);
  line-height: 1.7;
  margin-bottom: 14px;
}

.page-content ul, .page-content ol {
  padding-left: 22px;
  margin-bottom: 14px;
}

.page-content li {
  font-size: 16px;
  color: var(--ink-muted);
  line-height: 1.65;
  margin-bottom: 6px;
}

.page-content a { color: var(--accent-hover); }
.page-content a:hover { text-decoration: underline; }

/* ─── CONTACT FORM ─── */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 18px;
  max-width: 520px;
  margin-top: 28px;
}

.form-group { display: flex; flex-direction: column; gap: 6px; }

.form-group label {
  font-size: 13px;
  font-weight: 500;
  color: var(--ink-subtle);
  letter-spacing: 0;
}

.form-group input,
.form-group textarea {
  background: var(--surface-1);
  border: 1px solid var(--hairline-strong);
  border-radius: var(--radius-md);
  padding: 8px 12px;
  color: var(--ink);
  font-size: 16px;
  font-family: inherit;
  outline: none;
  transition: border-color 150ms ease;
  width: 100%;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--accent-focus);
  box-shadow: 0 0 0 2px rgba(94,106,210,0.25);
}

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

.form-group textarea { min-height: 130px; resize: vertical; }

.form-msg {
  display: none;
  background: var(--surface-1);
  border: 1px solid var(--hairline-strong);
  border-left: 2px solid var(--accent);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 14px 18px;
  color: var(--ink-muted);
  font-size: 14px;
}

.form-msg.visible { display: block; }

.btn-submit {
  align-self: flex-start;
  background: var(--accent);
  color: #fff;
  font-size: 14px;
  font-weight: 500;
  padding: 10px 20px;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: background 150ms ease;
}

.btn-submit:hover { background: var(--accent-hover); }
.btn-submit:disabled { opacity: 0.6; cursor: default; }

/* ─── FOOTER ─── */
.site-footer {
  background: var(--canvas);
  border-top: 1px solid var(--hairline);
  padding: 64px 32px 40px;
  margin-top: 80px;
}

.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

@media (min-width: 768px) {
  .footer-inner { grid-template-columns: 1fr 2fr; }
}

.footer-brand .footer-wordmark {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.3px;
  color: var(--ink);
  margin-bottom: 8px;
}

.footer-brand p {
  font-size: 13px;
  color: var(--ink-subtle);
  line-height: 1.5;
  max-width: 220px;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
}

@media (min-width: 600px) {
  .footer-links { grid-template-columns: repeat(3, 1fr); }
}

.footer-links a {
  font-size: 13px;
  color: var(--ink-subtle);
  display: block;
  padding: 3px 0;
  transition: color 150ms ease;
}

.footer-links a:hover { color: var(--ink); }

.footer-bottom {
  max-width: var(--max-w);
  margin: 32px auto 0;
  padding-top: 20px;
  border-top: 1px solid var(--hairline);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}

.footer-bottom p {
  font-size: 12px;
  color: var(--ink-tertiary);
}

.footer-bottom a { color: var(--ink-tertiary); }
.footer-bottom a:hover { color: var(--ink-subtle); }

/* ─── COOKIE BANNER ─── */
.cookie-banner {
  position: fixed;
  bottom: 16px; left: 16px; right: 16px;
  z-index: 200;
  background: var(--surface-2);
  border: 1px solid var(--hairline-strong);
  border-radius: var(--radius-lg);
  padding: 18px 22px;
  display: none;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
  max-width: 780px;
  margin: 0 auto;
}

.cookie-banner.visible { display: flex; }

.cookie-banner p {
  font-size: 13px;
  color: var(--ink-muted);
  flex: 1;
  min-width: 200px;
  line-height: 1.5;
}

.cookie-banner a { color: var(--accent-hover); }

.cookie-actions { display: flex; gap: 8px; flex-wrap: wrap; flex-shrink: 0; }

.btn-cookie {
  font-size: 13px;
  font-weight: 500;
  padding: 7px 14px;
  border-radius: var(--radius-md);
  border: 1px solid var(--hairline-strong);
  background: var(--surface-1);
  color: var(--ink-muted);
  cursor: pointer;
  transition: border-color 150ms ease, color 150ms ease;
}

.btn-cookie.primary {
  background: var(--accent);
  color: #fff;
  border-color: transparent;
}

.btn-cookie:hover { border-color: var(--accent); color: var(--ink); }
.btn-cookie.primary:hover { background: var(--accent-hover); }

/* ─── UTIL ─── */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 768px) {
  .site-nav { display: none; }
  .burger { display: flex; }
}