/* ============================================================
   LexiFlow Article — Design Tokens & Component Styles
   ============================================================ */

:root {
  /* Type Scale */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.25rem);
  --text-3xl: clamp(2.5rem, 1rem + 4vw, 4.5rem);

  /* Spacing (4px base) */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  --radius-sm: 0.3rem;
  --radius-md: 0.55rem;
  --radius-lg: 0.9rem;
  --radius-xl: 1.25rem;
  --radius-full: 9999px;

  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  --content-narrow: 640px;
  --content-default: 800px;
  --content-wide: 1180px;

  --font-display: 'Playfair Display', 'Georgia', serif;
  --font-body: 'Source Sans 3', 'Helvetica Neue', sans-serif;
}

/* ---------- Light mode (default) ---------- */
:root,
[data-theme='light'] {
  --color-bg: #f8f6f1;
  --color-surface: #ffffff;
  --color-surface-2: #fbfaf6;
  --color-surface-offset: #f1eee4;
  --color-surface-offset-2: #e8e2d2;
  --color-divider: #e0dac9;
  --color-border: #d6cdb4;

  --color-text: #10203a;
  --color-text-muted: #4d5a72;
  --color-text-faint: #9aa2b3;
  --color-text-inverse: #f8f6f1;

  --color-navy: #0f2547;
  --color-navy-2: #16335f;

  --color-primary: #a3791f;
  --color-primary-hover: #8a6417;
  --color-primary-active: #6e4f11;
  --color-primary-highlight: #f0e2ba;

  --color-success: #3f6b3a;
  --color-success-highlight: #dfe9db;

  --shadow-sm: 0 1px 2px rgba(16, 32, 58, 0.06);
  --shadow-md: 0 6px 20px rgba(16, 32, 58, 0.08);
  --shadow-lg: 0 16px 40px rgba(16, 32, 58, 0.14);
}

/* ---------- Dark mode ---------- */
[data-theme='dark'] {
  --color-bg: #0a1424;
  --color-surface: #0f1f38;
  --color-surface-2: #12233f;
  --color-surface-offset: #152847;
  --color-surface-offset-2: #1c3153;
  --color-divider: #223655;
  --color-border: #2a3f61;

  --color-text: #eae6d9;
  --color-text-muted: #a9b0c2;
  --color-text-faint: #6c7690;
  --color-text-inverse: #10203a;

  --color-navy: #0a1424;
  --color-navy-2: #0f1f38;

  --color-primary: #d9b65a;
  --color-primary-hover: #e8cb80;
  --color-primary-active: #f5dda0;
  --color-primary-highlight: #3a331c;

  --color-success: #7fae74;
  --color-success-highlight: #223326;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 6px 20px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.5);
}

/* ============================================================
   Global
   ============================================================ */

.wrap {
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: clamp(var(--space-5), 4vw, var(--space-12));
}

.eyebrow {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-primary);
}

h1,
h2,
h3 {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

a {
  color: var(--color-primary);
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}
a:hover {
  color: var(--color-primary-hover);
}

/* ============================================================
   Skip link
   ============================================================ */
.skip-link {
  position: absolute;
  top: -100px;
  left: var(--space-4);
  background: var(--color-navy);
  color: #fff;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-sm);
  z-index: 100;
}
.skip-link:focus {
  top: var(--space-4);
}

/* ============================================================
   Header
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in oklab, var(--color-bg) 88%, transparent);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--color-divider);
  transition:
    transform 0.3s cubic-bezier(0.16, 1, 0.3, 1),
    box-shadow 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}
.site-header--hidden {
  transform: translateY(-100%);
}
.site-header--scrolled {
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding-block: var(--space-3);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  color: var(--color-text);
}
.brand svg {
  width: 34px;
  height: 34px;
  flex-shrink: 0;
}
.brand-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-lg);
  color: var(--color-text);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
}
.icon-btn:hover {
  background: var(--color-surface-offset);
  color: var(--color-text);
}
.icon-btn svg {
  width: 19px;
  height: 19px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 600;
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-full);
  white-space: nowrap;
}
.btn-primary {
  background: var(--color-navy);
  color: #f8f6f1;
}
[data-theme='dark'] .btn-primary {
  background: var(--color-primary);
  color: #10203a;
}
.btn-primary:hover {
  background: var(--color-navy-2);
}
[data-theme='dark'] .btn-primary:hover {
  background: var(--color-primary-hover);
}
.btn-outline {
  border: 1.5px solid var(--color-border);
  color: var(--color-text);
}
.btn-outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* ============================================================
   Hero
   ============================================================ */
.hero {
  position: relative;
  overflow: hidden;
  background: var(--color-navy);
  color: #f5f3ec;
}
.hero-media {
  position: relative;
  min-height: clamp(420px, 62vw, 640px);
  display: flex;
  align-items: flex-end;
}
.hero-media img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.hero-media::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    100deg,
    rgba(8, 16, 30, 0.94) 0%,
    rgba(8, 16, 30, 0.72) 32%,
    rgba(8, 16, 30, 0.28) 58%,
    rgba(8, 16, 30, 0.05) 78%
  );
}
.hero-content {
  position: relative;
  z-index: 2;
  padding-top: clamp(var(--space-16), 10vw, var(--space-32));
  padding-bottom: clamp(var(--space-12), 7vw, var(--space-20));
  max-width: 760px;
}
.hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: #e8cb80;
  margin-bottom: var(--space-5);
}
.hero-kicker svg {
  width: 14px;
  height: 14px;
}
.hero h1 {
  font-size: var(--text-3xl);
  line-height: 1.06;
  color: #fff;
  margin-bottom: var(--space-6);
}
.hero h1 em {
  font-style: italic;
  color: #e8cb80;
}
.hero-dek {
  font-size: var(--text-lg);
  color: #d8dbe6;
  max-width: 58ch;
  margin-bottom: var(--space-8);
  font-weight: 400;
}
.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3) var(--space-6);
  max-width: 460px;
  font-size: var(--text-xs);
  color: #aeb4c4;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.hero-meta strong {
  color: #e8cb80;
  font-weight: 600;
}

/* ============================================================
   Layout: sidebar + article
   ============================================================ */
.content-shell {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: clamp(var(--space-8), 5vw, var(--space-16));
  padding-block: clamp(var(--space-12), 7vw, var(--space-24));
}
@media (max-width: 900px) {
  .content-shell {
    grid-template-columns: 1fr;
  }
}

.toc {
  position: sticky;
  top: calc(var(--space-16) + 8px);
  align-self: start;
  padding-top: var(--space-2);
}
@media (max-width: 900px) {
  .toc {
    position: static;
    margin-bottom: var(--space-8);
    border: 1px solid var(--color-divider);
    border-radius: var(--radius-lg);
    padding: var(--space-5);
    background: var(--color-surface);
  }
}
.toc-label {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  margin-bottom: var(--space-3);
}
.toc ol {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  border-left: 1px solid var(--color-divider);
}
.toc a {
  display: block;
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  padding: var(--space-1) 0 var(--space-1) var(--space-4);
  border-left: 2px solid transparent;
  margin-left: -1px;
}
.toc a:hover {
  color: var(--color-primary);
  border-left-color: var(--color-primary);
}

article.post {
  max-width: 720px;
}
article.post > .lede {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  font-weight: 400;
  margin-bottom: var(--space-10);
  line-height: 1.55;
}
article.post h2 {
  font-size: var(--text-xl);
  margin-top: var(--space-16);
  margin-bottom: var(--space-5);
  padding-top: var(--space-2);
  scroll-margin-top: var(--space-20);
}
article.post h2:first-of-type {
  margin-top: 0;
}
article.post h3 {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: var(--text-lg);
  color: var(--color-text);
  margin-top: var(--space-10);
  margin-bottom: var(--space-3);
  scroll-margin-top: var(--space-20);
}
article.post p {
  font-size: var(--text-base);
  color: var(--color-text);
  margin-bottom: var(--space-5);
  max-width: 68ch;
}
article.post ul,
article.post ol.plain {
  margin: var(--space-5) 0 var(--space-6);
  padding-left: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
article.post li {
  font-size: var(--text-base);
  max-width: 66ch;
}
article.post li strong {
  color: var(--color-text);
}
article.post strong {
  font-weight: 700;
}

/* Section divider rule */
.rule {
  border: none;
  border-top: 1px solid var(--color-divider);
  margin: var(--space-16) 0;
}

/* Pull quote / callout */
.callout {
  border-left: 3px solid var(--color-primary);
  background: var(--color-surface-offset);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: var(--space-5) var(--space-6);
  margin: var(--space-6) 0 var(--space-8);
  font-size: var(--text-base);
  color: var(--color-text);
}
.callout cite {
  display: block;
  margin-top: var(--space-2);
  font-style: normal;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* Stat cards row */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: var(--space-4);
  margin: var(--space-8) 0 var(--space-10);
}
.stat-card {
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  box-shadow: var(--shadow-sm);
}
.stat-card .num {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: var(--space-2);
}
.stat-card .label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  line-height: 1.4;
}

/* Table */
.table-wrap {
  overflow-x: auto;
  margin: var(--space-6) 0 var(--space-8);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
}
table.compare {
  font-size: var(--text-sm);
}
table.compare th,
table.compare td {
  text-align: left;
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--color-divider);
}
table.compare thead th {
  background: var(--color-surface-offset);
  font-weight: 700;
  color: var(--color-text);
}
table.compare tbody tr:last-child td {
  border-bottom: none;
}
table.compare td.win {
  color: var(--color-success);
  font-weight: 700;
}

/* Checklist */
.check-list {
  list-style: none;
  padding-left: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.check-list li {
  display: flex;
  gap: var(--space-3);
  align-items: flex-start;
  max-width: 66ch;
}
.check-list svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  margin-top: 3px;
  color: var(--color-success);
}

/* Module grid */
.module-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--space-4);
  margin: var(--space-6) 0 var(--space-8);
}
.module-card {
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-md);
  padding: var(--space-4) var(--space-5);
}
.module-card .name {
  font-weight: 700;
  font-size: var(--text-sm);
  color: var(--color-text);
  margin-bottom: var(--space-1);
}
.module-card .desc {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* Pricing cards */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-4);
  margin: var(--space-6) 0 var(--space-8);
}
.pricing-card {
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  background: var(--color-surface);
}
.pricing-card.featured {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  position: relative;
}
.pricing-card.featured::before {
  content: 'Most Popular';
  position: absolute;
  top: -12px;
  left: var(--space-5);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  font-size: var(--text-xs);
  font-weight: 700;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
}
.pricing-card h4 {
  font-family: var(--font-display);
  font-size: var(--text-base);
  margin-bottom: var(--space-2);
}
.pricing-card .price {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-3);
}
.pricing-card p {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

/* FAQ */
.faq-item {
  border-bottom: 1px solid var(--color-divider);
}
.faq-item:first-child {
  border-top: 1px solid var(--color-divider);
}
.faq-q {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-5) 0;
  text-align: left;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: var(--text-base);
  color: var(--color-text);
}
.faq-q .plus {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  border-radius: var(--radius-full);
  border: 1.5px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}
.faq-q .plus::before,
.faq-q .plus::after {
  content: '';
  position: absolute;
  background: var(--color-text-muted);
  transition: transform var(--transition-interactive);
}
.faq-q .plus::before {
  width: 10px;
  height: 1.5px;
}
.faq-q .plus::after {
  width: 1.5px;
  height: 10px;
}
.faq-item[open] .faq-q .plus::after {
  transform: rotate(90deg);
  opacity: 0;
}
.faq-item[open] .faq-q {
  color: var(--color-primary);
}
.faq-a {
  padding: 0 0 var(--space-5);
  color: var(--color-text-muted);
  font-size: var(--text-base);
  max-width: 66ch;
}
.faq-a a {
  color: var(--color-primary);
}

/* Source note */
.source-note {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  border-top: 1px dashed var(--color-divider);
  padding-top: var(--space-4);
  margin-top: var(--space-16);
  max-width: 66ch;
}

/* CTA band */
.cta-band {
  background: var(--color-navy);
  color: #f5f3ec;
  border-radius: var(--radius-xl);
  padding: clamp(var(--space-10), 6vw, var(--space-16));
  margin-top: var(--space-16);
  position: relative;
  overflow: hidden;
}
.cta-band::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 85% 20%, rgba(217, 182, 90, 0.18), transparent 60%);
}
.cta-band-inner {
  position: relative;
  z-index: 1;
  max-width: 640px;
}
.cta-band .cta-band-inner h2 {
  color: #fff;
  font-size: var(--text-xl);
  margin-bottom: var(--space-4);
}
.cta-band .cta-band-inner p {
  color: #cfd3e0;
  margin-bottom: var(--space-6);
  max-width: 56ch;
}
.cta-band .btn-primary {
  background: #e8cb80;
  color: #10203a;
}
.cta-band .btn-primary:hover {
  background: #f5dda0;
}

/* Conclusion block final CTA (in-article) */
.conclusion-cta {
  text-align: left;
}

/* ============================================================
   Footer
   ============================================================ */
.site-footer {
  border-top: 1px solid var(--color-divider);
  padding-block: var(--space-12);
  background: var(--color-surface-2);
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-4);
}
.footer-brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.footer-brand svg {
  width: 24px;
  height: 24px;
}
.footer-brand span {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-sm);
}
.footer-meta {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}
.footer-links {
  display: flex;
  gap: var(--space-5);
  font-size: var(--text-sm);
}
.footer-links a {
  color: var(--color-text-muted);
  text-decoration: none;
}
.footer-links a:hover {
  color: var(--color-primary);
}

/* ============================================================
   Responsive tweaks
   ============================================================ */
@media (max-width: 640px) {
  .header-actions .btn-outline span {
    display: none;
  }
  .hero-meta {
    gap: var(--space-4);
  }
  .stat-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}