/* ===== Design Tokens ===== */
:root,
[data-theme='light'] {
  --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, 3.5rem);
  --text-3xl: clamp(2.5rem, 1rem + 4vw, 5rem);
  --text-hero: clamp(2.75rem, 1rem + 6vw, 6.5rem);

  --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;

  /* Surfaces (Nexus Beige — matches report brand) */
  --color-bg: #f7f6f2;
  --color-surface: #f9f8f5;
  --color-surface-2: #fbfbf9;
  --color-surface-offset: #f3f0ec;
  --color-surface-offset-2: #edeae5;
  --color-surface-dynamic: #e6e4df;
  --color-divider: #dcd9d5;
  --color-border: #d4d1ca;

  /* Text */
  --color-text: #171614;
  --color-text-muted: #7a7974;
  --color-text-faint: #bab9b4;
  --color-text-inverse: #f9f8f4;

  /* Primary Accent (Hydra Teal — matches report brand) */
  --color-primary: #01696f;
  --color-primary-hover: #0c4e54;
  --color-primary-active: #0f3638;
  --color-primary-highlight: #cedcd8;

  --color-warning: #964219;
  --color-warning-highlight: #ddcfc6;
  --color-error: #a12c7b;
  --color-success: #437a22;

  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

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

  --shadow-sm: 0 1px 2px oklch(0.2 0.01 80 / 0.06);
  --shadow-md: 0 4px 12px oklch(0.2 0.01 80 / 0.08);
  --shadow-lg: 0 12px 32px oklch(0.2 0.01 80 / 0.12);

  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1200px;
  --content-full: 100%;

  --font-display: 'Playfair Display', Georgia, serif;
  --font-body: 'DM Sans', 'Helvetica Neue', sans-serif;
  --font-mono: 'IBM Plex Mono', 'Courier New', monospace;
}

[data-theme='dark'] {
  --color-bg: #14151a;
  --color-surface: #191a1f;
  --color-surface-2: #1d1e24;
  --color-surface-offset: #1a1b20;
  --color-surface-offset-2: #202127;
  --color-surface-dynamic: #2a2b32;
  --color-divider: #26272d;
  --color-border: #34353d;
  --color-text: #e6e5e1;
  --color-text-muted: #9a99a0;
  --color-text-faint: #63636b;
  --color-text-inverse: #171614;
  --color-primary: #4fb3ab;
  --color-primary-hover: #6ec4bd;
  --color-primary-active: #8ad0ca;
  --color-primary-highlight: #223634;
  --color-warning: #d38a5d;
  --color-warning-highlight: #453427;
  --color-error: #d789b7;
  --color-success: #8dc768;
  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.3);
  --shadow-md: 0 4px 12px oklch(0 0 0 / 0.4);
  --shadow-lg: 0 12px 32px oklch(0 0 0 / 0.5);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme='light']) {
    --color-bg: #14151a;
    --color-surface: #191a1f;
    --color-surface-2: #1d1e24;
    --color-surface-offset: #1a1b20;
    --color-surface-offset-2: #202127;
    --color-surface-dynamic: #2a2b32;
    --color-divider: #26272d;
    --color-border: #34353d;
    --color-text: #e6e5e1;
    --color-text-muted: #9a99a0;
    --color-text-faint: #63636b;
    --color-text-inverse: #171614;
    --color-primary: #4fb3ab;
    --color-primary-hover: #6ec4bd;
    --color-primary-active: #8ad0ca;
    --color-primary-highlight: #223634;
    --color-warning: #d38a5d;
    --color-warning-highlight: #453427;
    --color-error: #d789b7;
    --color-success: #8dc768;
    --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.3);
    --shadow-md: 0 4px 12px oklch(0 0 0 / 0.4);
    --shadow-lg: 0 12px 32px oklch(0 0 0 / 0.5);
  }
}

/* ===== Layout Primitives ===== */
.container {
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: var(--space-5);
}
.container--narrow {
  max-width: var(--content-narrow);
}
.container--default {
  max-width: var(--content-default);
}
.prose {
  max-width: 68ch;
}
section {
  padding-block: clamp(var(--space-12), 8vw, var(--space-24));
}

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: oklch(from var(--color-bg) l c h / 0.88);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-divider);
  transition: box-shadow var(--transition-interactive);
}
.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-4);
}
.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-text);
}
.brand-logo {
  width: 34px;
  height: 34px;
  color: var(--color-primary);
  flex-shrink: 0;
}
.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}
.brand-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-sm);
  letter-spacing: 0.01em;
}
.brand-sub {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}
.main-nav a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--transition-interactive);
}
.main-nav a:hover,
.main-nav a.active {
  color: var(--color-text);
}
.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text-muted);
  cursor: pointer;
  transition: var(--transition-interactive);
}
.theme-toggle:hover {
  background: var(--color-surface-offset);
  color: var(--color-text);
}
.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  cursor: pointer;
}

/* ===== Buttons ===== */
.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-6);
  border-radius: var(--radius-md);
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: var(--transition-interactive);
  white-space: nowrap;
}
.btn-primary {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}
.btn-primary:hover {
  background: var(--color-primary-hover);
}
.btn-secondary {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}
.btn-secondary:hover {
  background: var(--color-surface-offset);
  border-color: var(--color-text-muted);
}
.btn-linkedin {
  background: #0a66c2;
  color: #ffffff;
}
.btn-linkedin:hover {
  background: #08487f;
}

/* ===== Hero ===== */
.hero {
  position: relative;
  padding-block: clamp(var(--space-16), 12vw, var(--space-32)) clamp(var(--space-12), 8vw, var(--space-20));
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(ellipse 60% 50% at 85% 0%, oklch(from var(--color-primary) l c h / 0.14), transparent 70%),
    radial-gradient(ellipse 50% 40% at 10% 10%, oklch(from var(--color-primary) l c h / 0.08), transparent 70%);
}
.hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-primary);
  font-weight: 700;
  margin-bottom: var(--space-6);
}
.hero-kicker::before {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-primary);
  display: inline-block;
}
.hero h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.25rem, 1.4rem + 4vw, var(--text-hero));
  max-width: 20ch;
  margin-bottom: var(--space-6);
  color: var(--color-text);
}
.hero-dek {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  max-width: 58ch;
  margin-bottom: var(--space-8);
  font-weight: 400;
}
.hero-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-5);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-divider);
}
.hero-meta strong {
  color: var(--color-text);
  font-weight: 600;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-bottom: var(--space-8);
}

/* ===== Executive Summary Card ===== */
.summary-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: clamp(var(--space-6), 4vw, var(--space-10));
  box-shadow: var(--shadow-sm);
  position: relative;
}
.summary-card::before {
  content: '';
  position: absolute;
  left: 0;
  top: var(--space-6);
  bottom: var(--space-6);
  width: 3px;
  background: var(--color-primary);
  border-radius: var(--radius-full);
}
.summary-card h2 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  margin-bottom: var(--space-4);
  padding-left: var(--space-5);
}
.summary-card p {
  padding-left: var(--space-5);
  color: var(--color-text);
  font-size: var(--text-base);
  line-height: 1.7;
}

/* ===== Theme index (numbered pillars) ===== */
.theme-index {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(240px, 100%), 1fr));
  gap: var(--space-4);
  margin-top: var(--space-10);
}
.theme-index a {
  display: block;
  padding: var(--space-5);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  text-decoration: none;
  color: var(--color-text);
  background: var(--color-surface);
  transition: var(--transition-interactive);
}
.theme-index a:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.theme-index .num {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  color: var(--color-primary);
  display: block;
  margin-bottom: var(--space-2);
}
.theme-index .label {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.4;
}

/* ===== Article body ===== */
.article-section {
  padding-block: clamp(var(--space-8), 5vw, var(--space-12));
  border-bottom: 1px solid var(--color-divider);
  scroll-margin-top: var(--space-20);
}
.article-section:last-of-type {
  border-bottom: none;
}
.article-section h2 {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  margin-bottom: var(--space-5);
  max-width: 32ch;
}
.article-section .section-number {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-primary);
  text-transform: uppercase;
  margin-bottom: var(--space-3);
}
.article-section p {
  max-width: 72ch;
  margin-bottom: var(--space-5);
  font-size: var(--text-base);
  line-height: 1.75;
  color: var(--color-text);
}
.article-section a {
  color: var(--color-primary);
  text-decoration-color: oklch(from var(--color-primary) l c h / 0.4);
  text-underline-offset: 2px;
}
.article-section a:hover {
  color: var(--color-primary-hover);
}
.callout {
  background: var(--color-primary-highlight);
  border-left: 3px solid var(--color-primary);
  border-radius: var(--radius-md);
  padding: var(--space-5) var(--space-6);
  max-width: 72ch;
  margin-block: var(--space-6);
}
.callout strong {
  color: var(--color-primary-active);
  display: block;
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--space-2);
}
.callout p {
  margin-bottom: 0;
  color: var(--color-text);
}

/* ===== Compliance table ===== */
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  margin-block: var(--space-6);
  max-width: 72ch;
}
table.compliance {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
}
table.compliance th,
table.compliance td {
  text-align: left;
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-divider);
}
table.compliance th {
  background: var(--color-surface-offset);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
  font-weight: 700;
  white-space: nowrap;
}
table.compliance tr:last-child td {
  border-bottom: none;
}
table.compliance td:first-child {
  white-space: nowrap;
  font-weight: 600;
  color: var(--color-text);
}

/* ===== Action list ===== */
.action-list {
  list-style: none;
  max-width: 72ch;
  counter-reset: action;
}
.action-list li {
  counter-increment: action;
  display: flex;
  gap: var(--space-4);
  padding-block: var(--space-4);
  border-bottom: 1px solid var(--color-divider);
}
.action-list li:last-child {
  border-bottom: none;
}
.action-list li::before {
  content: counter(action);
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 700;
}
.action-list li p {
  margin: 0;
  padding-top: var(--space-1);
}
.action-list li strong {
  color: var(--color-text);
}

/* ===== Byline / footnote ===== */
.byline-block {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-block: var(--space-8);
  padding: var(--space-4) var(--space-5);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  max-width: 72ch;
}
.byline-avatar {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-weight: 700;
  flex-shrink: 0;
}
.byline-name {
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-text);
}
.byline-role {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}
.footnote {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  font-style: italic;
  max-width: 72ch;
  margin-top: var(--space-8);
}

/* ===== Archive ===== */
.archive-hero {
  padding-block: clamp(var(--space-12), 8vw, var(--space-20)) var(--space-8);
}
.archive-hero h1 {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  margin-bottom: var(--space-4);
}
.archive-hero p {
  color: var(--color-text-muted);
  max-width: 60ch;
  font-size: var(--text-base);
}
.archive-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  padding-bottom: var(--space-16);
}
.archive-card {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: var(--space-6);
  padding: var(--space-6);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  text-decoration: none;
  color: var(--color-text);
  transition: var(--transition-interactive);
}
.archive-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
}
.archive-vol {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  color: var(--color-primary);
  min-width: 80px;
}
.archive-vol span {
  display: block;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-family: var(--font-body);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-1);
}
.archive-info h3 {
  font-size: var(--text-base);
  margin-bottom: var(--space-1);
}
.archive-info p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}
.archive-arrow {
  color: var(--color-text-faint);
  transition: var(--transition-interactive);
}
.archive-card:hover .archive-arrow {
  color: var(--color-primary);
  transform: translateX(3px);
}
.archive-current-badge {
  display: inline-flex;
  align-items: center;
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-primary);
  background: var(--color-primary-highlight);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  margin-left: var(--space-2);
}

/* ===== About / methodology ===== */
.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(260px, 100%), 1fr));
  gap: var(--space-6);
  margin-top: var(--space-10);
}
.about-card {
  padding: var(--space-6);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
}
.about-card h3 {
  font-family: var(--font-display);
  font-size: var(--text-base);
  margin-bottom: var(--space-2);
  color: var(--color-primary);
}
.about-card p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

/* ===== Subscribe / CTA band ===== */
.cta-band {
  background: var(--color-text);
  border-radius: var(--radius-xl);
  padding: clamp(var(--space-8), 6vw, var(--space-12));
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}
[data-theme='dark'] .cta-band {
  background: var(--color-surface-offset-2);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme='light']) .cta-band {
    background: var(--color-surface-offset-2);
  }
}
.cta-band h2 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  color: var(--color-text-inverse);
  max-width: 30ch;
}
.cta-band p {
  color: oklch(from var(--color-text-inverse) l c h / 0.7);
  font-size: var(--text-sm);
  margin-top: var(--space-2);
  max-width: 40ch;
}

/* ===== Footer ===== */
.site-footer {
  border-top: 1px solid var(--color-divider);
  padding-block: var(--space-12);
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-8);
}
.footer-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}
.footer-logo {
  width: 26px;
  height: 26px;
  color: var(--color-primary);
}
.footer-links {
  display: flex;
  gap: var(--space-6);
  flex-wrap: wrap;
}
.footer-links a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-decoration: none;
}
.footer-links a:hover {
  color: var(--color-text);
}
.footer-linkedin {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-decoration: none;
}
.footer-linkedin:hover {
  color: #0a66c2;
}
.footer-meta {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  margin-top: var(--space-6);
  max-width: 72ch;
}

/* ===== Reading progress ===== */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: var(--color-primary);
  z-index: 60;
  width: 0%;
  transition: width 80ms linear;
}

/* ===== TOC sidebar (desktop) ===== */
.article-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-12);
}
.toc {
  display: none;
}
@media (min-width: 1024px) {
  .article-layout {
    grid-template-columns: minmax(0, 1fr) 220px;
  }
  .toc {
    display: block;
    position: sticky;
    top: calc(var(--space-20) + var(--space-4));
    align-self: start;
    font-size: var(--text-xs);
  }
  .toc-label {
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-text-faint);
    margin-bottom: var(--space-3);
    font-weight: 700;
  }
  .toc a {
    display: block;
    padding-block: var(--space-2);
    color: var(--color-text-muted);
    text-decoration: none;
    border-left: 2px solid var(--color-divider);
    padding-left: var(--space-3);
    transition: var(--transition-interactive);
  }
  .toc a:hover,
  .toc a.active {
    color: var(--color-primary);
    border-left-color: var(--color-primary);
  }
}

/* ===== Responsive ===== */
@media (max-width: 860px) {
  .main-nav {
    position: fixed;
    inset: 64px var(--space-4) auto var(--space-4);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-4);
    gap: var(--space-1);
    display: none;
    z-index: 55;
  }
  .main-nav.open {
    display: flex;
  }
  .main-nav a {
    padding: var(--space-3) var(--space-2);
    color: var(--color-text);
  }
  .nav-toggle {
    display: flex;
  }
  .archive-card {
    grid-template-columns: 1fr;
    text-align: left;
    gap: var(--space-3);
  }
  .archive-arrow {
    display: none;
  }
}
@media (max-width: 640px) {
  .hero-meta {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-2);
  }
}