/* ============================================================
   DESIGN TOKENS
   Adjust these custom properties to change the site's visual theme.
   ============================================================ */
:root {
    /* Colors */
    --color-primary: #000033;
    --color-primary-rgb: 0, 0, 51;
    --color-bg: #fdfcf9;
    --color-bg-alt: #ffffff;
    --color-text: #0f172a;
    --color-text-muted: #475569;
    --color-text-subtle: #64748b;
    --color-text-faint: #94a3b8;
    --color-border: rgba(0, 0, 51, 0.1);
    --color-border-strong: rgba(0, 0, 51, 0.2);
    --color-border-faint: rgba(0, 0, 51, 0.05);
    --color-surface-muted: #f1f5f9;
    --color-orange: #f97316;
    --color-danger: #dc2626;

    /* Typography */
    --font-display: 'Inter', sans-serif;
    --font-serif: 'Instrument Serif', serif;
    --font-mono: 'JetBrains Mono', monospace;

    /* Spacing scale */
    --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;

    /* Border radius */
    --radius-sm: 0.125rem;
    --radius: 0.25rem;
    --radius-lg: 0.5rem;
    --radius-xl: 0.75rem;

    /* Shadows */
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 51, 0.05), 0 8px 10px -6px rgba(0, 0, 51, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 51, 0.08);

    /* Layout */
    --container-max: 80rem;
    --container-narrow: 72rem;
    --container-tight: 56rem;
    --container-pad: 1.5rem;
}

/* ============================================================
   RESET & BASE
   ============================================================ */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    -webkit-text-size-adjust: 100%;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-display);
    color: var(--color-text);
    background-color: var(--color-bg);
    line-height: 1.6;
    min-height: 100vh;
}

img, svg {
    display: block;
    max-width: 100%;
}

a {
    color: inherit;
    text-decoration: none;
}

ul, ol {
    list-style: none;
}

button {
    font-family: inherit;
    cursor: pointer;
}

/* ============================================================
   TYPOGRAPHY
   ============================================================ */
.heading-serif {
    font-family: var(--font-serif);
}

.text-mono {
    font-family: var(--font-mono);
}

/* ============================================================
   LAYOUT
   ============================================================ */
.container {
    max-width: var(--container-max);
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--container-pad);
    padding-right: var(--container-pad);
}

.container--narrow {
    max-width: var(--container-narrow);
}

.container--tight {
    max-width: var(--container-tight);
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    font-weight: 700;
    border: none;
    cursor: pointer;
    transition: opacity 0.15s ease, transform 0.15s ease;
    text-decoration: none;
    line-height: 1;
}

.btn:hover {
    opacity: 0.92;
}

.btn--primary {
    background-color: var(--color-primary);
    color: #fff;
    padding: var(--space-2) var(--space-5);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
}

.btn--lg {
    padding: var(--space-4) var(--space-8);
    border-radius: var(--radius-lg);
    font-size: 1.125rem;
}

.btn--xl {
    padding: var(--space-5) var(--space-12);
    border-radius: var(--radius-lg);
    font-size: 1.25rem;
}

/* ============================================================
   NAVIGATION
   ============================================================ */
.site-nav {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(253, 252, 249, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
}

.site-nav__inner {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-pad);
    height: 4rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.site-nav__brand {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    text-decoration: none;
    color: var(--color-primary);
}

.site-nav__brand-text {
    font-weight: 700;
    letter-spacing: -0.025em;
    color: var(--color-primary);
}

.site-nav__links {
    display: none;
    align-items: center;
    gap: var(--space-8);
}

.site-nav__link {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-muted);
    text-decoration: none;
    transition: color 0.15s ease;
}

.site-nav__link:hover,
.site-nav__link--active {
    color: var(--color-primary);
}

.site-nav__actions {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

.site-nav__actions .btn {
    display: none;
}

.site-nav__toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    color: var(--color-primary);
    padding: var(--space-2);
    cursor: pointer;
}

.site-nav__mobile {
    display: none;
    padding: var(--space-4) var(--container-pad) var(--space-6);
    border-top: 1px solid var(--color-border);
    background: rgba(253, 252, 249, 0.95);
    backdrop-filter: blur(12px);
}

.site-nav__mobile.is-open {
    display: block;
}

.site-nav__mobile-link {
    display: block;
    padding: var(--space-3) 0;
    font-size: 1rem;
    font-weight: 500;
    color: var(--color-text-muted);
    text-decoration: none;
    border-bottom: 1px solid var(--color-border-faint);
    transition: color 0.15s ease;
}

.site-nav__mobile-link:hover {
    color: var(--color-primary);
}

.site-nav__mobile-cta {
    display: flex;
    justify-content: center;
    margin-top: var(--space-4);
    width: 100%;
}

@media (min-width: 768px) {
    .site-nav__links {
        display: flex;
    }

    .site-nav__toggle {
        display: none;
    }

    .site-nav__actions .btn {
        display: inline-flex;
    }
}

/* ============================================================
   HERO SECTION
   ============================================================ */
.hero {
    position: relative;
    padding-top: var(--space-20);
    padding-bottom: var(--space-24);
    overflow: hidden;
}

.hero__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-12);
    align-items: center;
}

.hero__title {
    font-family: var(--font-serif);
    font-size: clamp(3rem, 6vw, 4.5rem);
    line-height: 1.1;
    color: var(--color-text);
    margin-bottom: var(--space-8);
}

.hero__title-accent {
    color: rgba(0, 0, 51, 0.6);
    font-style: italic;
}

.hero__subtitle {
    font-size: 1.25rem;
    color: var(--color-text-muted);
    line-height: 1.65;
    margin-bottom: var(--space-10);
    max-width: 42rem;
}

.hero__cta-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.hero__footnote {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-text-subtle);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.hero__aside-note {
    margin-top: var(--space-8);
    font-size: 0.6875rem;
    color: var(--color-text-faint);
    font-style: italic;
    text-align: center;
    max-width: 24rem;
    margin-left: auto;
    margin-right: auto;
}

@media (min-width: 1024px) {
    .hero__grid {
        grid-template-columns: 7fr 5fr;
    }
}

/* ============================================================
   FINDING CARD
   ============================================================ */
.finding-card {
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border-strong);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    box-shadow: var(--shadow-2xl);
    transition: transform 0.5s ease;
}

@media (min-width: 1024px) {
    .finding-card {
        transform: rotate(2deg);
    }

    .finding-card:hover {
        transform: rotate(0deg);
    }
}

.finding-card__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-6);
    padding-bottom: var(--space-4);
    border-bottom: 1px solid var(--color-border);
    flex-wrap: wrap;
    gap: var(--space-2);
}

.finding-card__badge {
    font-family: var(--font-mono);
    font-size: 0.625rem;
    background: rgba(0, 0, 51, 0.1);
    color: var(--color-primary);
    padding: var(--space-1) var(--space-2);
    border-radius: var(--radius-sm);
}

.finding-card__status {
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

.finding-card__pulse {
    width: 0.5rem;
    height: 0.5rem;
    border-radius: 50%;
    background: var(--color-orange);
    animation: pulse 2s infinite;
}

.finding-card__status-text {
    font-family: var(--font-mono);
    font-size: 0.625rem;
    font-weight: 700;
}

.finding-card__body {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    line-height: 1.65;
}

.finding-card__label {
    display: block;
    color: rgba(0, 0, 51, 0.5);
    font-weight: 700;
    margin-bottom: var(--space-1);
}

.finding-card__text {
    color: var(--color-text);
}

.finding-card__sources {
    list-style: disc;
    padding-left: var(--space-4);
    color: var(--color-text-muted);
}

.finding-card__confidence {
    background: rgba(0, 0, 51, 0.05);
    padding: var(--space-3);
    border-left: 2px solid var(--color-primary);
}

.finding-card__confidence-title {
    color: var(--color-primary);
    font-weight: 700;
    display: block;
    margin-bottom: var(--space-1);
}

.finding-card__confidence-text {
    color: rgba(0, 0, 51, 0.7);
    font-style: italic;
    font-size: 0.6875rem;
}

/* ============================================================
   STATS SECTION
   ============================================================ */
.stats-section {
    padding: var(--space-24) 0;
    background: var(--color-bg-alt);
    border-top: 1px solid var(--color-border-faint);
    border-bottom: 1px solid var(--color-border-faint);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-12);
    margin-bottom: var(--space-20);
    text-align: center;
}

.stat__value {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--space-2);
}

.stat__label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-subtle);
    text-transform: uppercase;
    letter-spacing: -0.025em;
}

.stat__desc {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    margin-top: var(--space-2);
    line-height: 1.5;
}

.stats-section__headline {
    font-family: var(--font-serif);
    font-size: 2.25rem;
    color: var(--color-text);
    text-align: center;
}

.stats-section__headline-accent {
    color: var(--color-primary);
}

@media (min-width: 768px) {
    .stats-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* ============================================================
   COMPARISON SECTION
   ============================================================ */
.comparison-section {
    padding: var(--space-24) 0;
}

.comparison-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-16);
    align-items: stretch;
}

.comparison-card {
    padding: var(--space-10);
    border-radius: var(--radius-xl);
    display: flex;
    flex-direction: column;
}

.comparison-card--existing {
    background: var(--color-surface-muted);
}

.comparison-card--investigator {
    background: var(--color-primary);
    color: #fff;
    box-shadow: var(--shadow-xl);
}

.comparison-card__header {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-8);
}

.comparison-card--existing .comparison-card__icon {
    color: var(--color-text-faint);
}

.comparison-card--investigator .comparison-card__icon {
    color: rgba(255, 255, 255, 0.6);
}

.comparison-card__title {
    font-weight: 700;
    font-size: 1.25rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.comparison-card--existing .comparison-card__title {
    color: var(--color-text-subtle);
}

.comparison-card--investigator .comparison-card__title {
    color: rgba(255, 255, 255, 0.6);
}

.comparison-card__list {
    display: flex;
    flex-direction: column;
    gap: var(--space-6);
    flex-grow: 1;
}

.comparison-card__item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-4);
}

.comparison-card--existing .comparison-card__item-icon {
    color: #cbd5e1;
    flex-shrink: 0;
    margin-top: 0.125rem;
}

.comparison-card--investigator .comparison-card__item-icon {
    color: #fff;
    flex-shrink: 0;
    margin-top: 0.125rem;
}

.comparison-card--existing .comparison-card__item {
    color: var(--color-text-muted);
}

.comparison-quote {
    margin-top: var(--space-20);
    max-width: 48rem;
    margin-left: auto;
    margin-right: auto;
    text-align: center;
}

.comparison-quote__text {
    font-family: var(--font-serif);
    font-size: 2.25rem;
    line-height: 1.35;
    color: #334155;
}

.comparison-quote__accent {
    color: var(--color-primary);
    font-style: italic;
    text-decoration: underline;
    text-decoration-color: rgba(0, 0, 51, 0.2);
    text-underline-offset: 0.5rem;
}

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

/* ============================================================
   PROSE BEATS SECTION
   Replaces numbered stats with declarative statements.
   ============================================================ */
.prose-beats {
    padding: var(--space-24) 0;
    background: var(--color-bg-alt);
    border-top: 1px solid var(--color-border-faint);
    border-bottom: 1px solid var(--color-border-faint);
}

.prose-beats__list {
    max-width: 48rem;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: var(--space-16);
}

.prose-beats__item {
    font-family: var(--font-serif);
    font-size: clamp(1.375rem, 3vw, 1.75rem);
    line-height: 1.45;
    color: var(--color-text);
}

.prose-beats__quote {
    margin-top: var(--space-20);
    max-width: 48rem;
    margin-left: auto;
    margin-right: auto;
    text-align: center;
}

.prose-beats__quote-text {
    font-family: var(--font-serif);
    font-size: clamp(1.75rem, 4vw, 2.25rem);
    line-height: 1.35;
    color: var(--color-primary);
    font-style: italic;
}

/* ============================================================
   CONTEXT SECTION (What Exists & What We're Building)
   ============================================================ */
.context-section {
    padding: var(--space-24) 0;
}

.context-section__title {
    font-family: var(--font-serif);
    font-size: clamp(2.5rem, 4vw, 3rem);
    margin-bottom: var(--space-12);
    text-align: center;
}

.context-section__body {
    display: flex;
    flex-direction: column;
    gap: var(--space-8);
    font-size: 1.25rem;
    color: var(--color-text-muted);
    line-height: 1.65;
    max-width: 48rem;
    margin-left: auto;
    margin-right: auto;
}

/* ============================================================
   OUTPUTS SECTION
   ============================================================ */
.outputs-section {
    padding: var(--space-24) 0;
    background: var(--color-bg);
}

.outputs-section__title {
    font-family: var(--font-serif);
    font-size: clamp(2.5rem, 4vw, 3rem);
    margin-bottom: var(--space-4);
    text-align: center;
    color: var(--color-primary);
}

.outputs-section__subtitle {
    text-align: center;
    color: var(--color-text-muted);
    max-width: 40rem;
    margin: 0 auto var(--space-16);
}

.outputs-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-8);
}

.output-card {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    padding: var(--space-6);
    border: 1px solid var(--color-border);
    background: var(--color-bg-alt);
    border-radius: var(--radius-sm);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}

.output-card__header {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding-bottom: var(--space-4);
    border-bottom: 1px solid var(--color-border-faint);
}

.output-card__icon {
    color: var(--color-primary);
    font-size: 1.5rem;
}

.output-card__title {
    font-weight: 700;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-primary);
}

.output-card__data {
    font-family: var(--font-mono);
    font-size: 0.6875rem;
    line-height: 1.5;
    opacity: 0.6;
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.output-card__data-entry {
    padding-left: var(--space-3);
    border-left: 2px solid var(--color-border);
}

.output-card__data-entry p {
    margin: 0;
}

.output-card__data-label {
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: -0.025em;
}

.output-card__text {
    font-size: 0.8125rem;
    line-height: 1.65;
    color: var(--color-text-muted);
    margin-top: auto;
}

/* Synthesis connector */
.outputs-connector {
    display: flex;
    justify-content: center;
    padding: var(--space-8) 0;
}

.outputs-connector__line {
    width: 1px;
    height: 4rem;
    background: linear-gradient(to bottom, var(--color-border), var(--color-primary));
}

/* Synthesis card */
.output-synthesis {
    max-width: 48rem;
    margin: 0 auto;
    padding: var(--space-8);
    border: 2px solid var(--color-primary);
    background: var(--color-bg-alt);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    position: relative;
    font-family: var(--font-mono);
}

.output-synthesis__badge {
    position: absolute;
    top: -0.75rem;
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-primary);
    color: #fff;
    font-size: 0.625rem;
    font-weight: 700;
    padding: 0.25rem 1rem;
    border-radius: 9999px;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    white-space: nowrap;
}

.output-synthesis__header {
    text-align: center;
    margin-bottom: var(--space-6);
}

.output-synthesis__title {
    color: var(--color-primary);
    font-weight: 700;
    font-size: 1.125rem;
}

.output-synthesis__version {
    font-size: 0.625rem;
    color: var(--color-text-faint);
}

.output-synthesis__quote {
    background: var(--color-surface-muted);
    padding: var(--space-4);
    border: 1px solid var(--color-border-faint);
    font-style: italic;
    font-size: 0.875rem;
    font-family: var(--font-display);
    color: var(--color-text);
    line-height: 1.7;
    margin-bottom: var(--space-6);
}

.output-synthesis__footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.625rem;
    font-weight: 700;
    color: var(--color-primary);
}

.output-synthesis__status {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.output-synthesis__dot {
    width: 0.5rem;
    height: 0.5rem;
    border-radius: 50%;
    background: var(--color-danger);
}

.outputs-section__link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-primary);
    text-decoration: none;
    margin-top: var(--space-12);
    transition: color 0.15s ease;
}

.outputs-section__link:hover {
    color: var(--color-text-muted);
}

.outputs-section__disclaimer {
    text-align: center;
    font-size: 0.75rem;
    color: var(--color-text-faint);
    font-style: italic;
    max-width: 44rem;
    margin: var(--space-8) auto 0;
    line-height: 1.6;
}

@media (min-width: 768px) {
    .outputs-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* ============================================================
   CTA SECTION
   ============================================================ */
.cta-section {
    padding: var(--space-24) 0;
    text-align: center;
}

.cta-section__title {
    font-family: var(--font-serif);
    font-size: clamp(3rem, 5vw, 3.75rem);
    margin-bottom: var(--space-12);
}

.cta-section__content {
    display: flex;
    flex-direction: column;
    gap: var(--space-8);
    font-size: 1.25rem;
    color: var(--color-text-muted);
    line-height: 1.65;
    margin-bottom: var(--space-16);
    text-align: left;
}

.cta-section__badges {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-12);
    padding-top: var(--space-12);
    border-top: 1px solid var(--color-border);
    margin-top: var(--space-12);
}

.cta-section__widget {
    margin-bottom: var(--space-12);
}

.cta-badge {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: 0.875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: rgba(0, 0, 51, 0.6);
}

/* ============================================================
   SYSTEM PAGE — HERO
   ============================================================ */
.system-hero {
    padding: var(--space-20) 0 var(--space-24);
    overflow: hidden;
}

.system-hero__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-12);
    align-items: center;
}

.system-hero__title {
    font-family: var(--font-serif);
    font-size: clamp(2.5rem, 5vw, 3.75rem);
    line-height: 1.1;
    color: var(--color-text);
    margin-bottom: var(--space-6);
}

.system-hero__title-accent {
    color: rgba(0, 0, 51, 0.6);
    font-style: italic;
}

.system-hero__subtitle {
    font-size: 1.25rem;
    color: var(--color-text-muted);
    line-height: 1.65;
    margin-bottom: var(--space-8);
    max-width: 36rem;
}

.system-hero__visual {
    display: flex;
    align-items: center;
    justify-content: center;
}

.system-hero__diagram {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-12) var(--space-16);
    border: 2px solid var(--color-border-strong);
    border-radius: var(--radius-xl);
    background: var(--color-bg-alt);
    box-shadow: var(--shadow-2xl);
}

.system-hero__diagram-icon {
    font-size: 3rem;
    color: var(--color-primary);
}

.system-hero__diagram-label {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.system-hero__diagram-sublabel {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-text-subtle);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

@media (min-width: 768px) {
    .system-hero__grid {
        grid-template-columns: 3fr 2fr;
    }
}

/* ============================================================
   SYSTEM PAGE — PIPELINE VISUAL
   ============================================================ */
.pipeline {
    padding: var(--space-12) 0 var(--space-20);
}

.pipeline__track {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: var(--space-4);
}

.pipeline__stage {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
}

.pipeline__icon {
    font-size: 1.875rem;
    color: var(--color-primary);
}

.pipeline__label {
    font-family: var(--font-mono);
    font-size: 0.6875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-text-subtle);
}

.pipeline__connector {
    height: 1px;
    flex: 1 1 1.5rem;
    min-width: 1rem;
    max-width: 6rem;
    background: var(--color-border-strong);
}

/* ============================================================
   SYSTEM PAGE — LAYER CARDS (Accordion + 3 Tiers)
   ============================================================ */
.layers-section {
    padding: var(--space-16) 0 var(--space-24);
}

.layers-section__title {
    font-family: var(--font-serif);
    font-size: clamp(2rem, 4vw, 2.5rem);
    margin-bottom: var(--space-12);
    padding-bottom: var(--space-4);
    border-bottom: 1px solid var(--color-border);
}

.layer-card {
    border-bottom: 1px solid var(--color-border-faint);
    background: var(--color-bg-alt);
    transition: background 0.15s ease;
}

.layer-card + .layer-card {
    margin-top: var(--space-1);
}

.layer-card__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: var(--space-6);
    background: none;
    border: none;
    cursor: pointer;
    text-align: left;
    font-family: inherit;
    color: inherit;
    transition: background 0.15s ease;
}

.layer-card__header:hover {
    background: var(--color-surface-muted);
}

.layer-card__meta {
    display: flex;
    align-items: center;
    gap: var(--space-6);
}

.layer-card__number {
    font-family: var(--font-mono);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-orange);
    flex-shrink: 0;
}

.layer-card__title {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--space-1);
}

.layer-card__subtitle {
    font-size: 0.875rem;
    color: var(--color-text-subtle);
}

.layer-card__toggle {
    color: var(--color-text-faint);
    transition: transform 0.2s ease;
    flex-shrink: 0;
}

/* Body and tiers */
.layer-card__body {
    display: none;
    padding: 0 var(--space-6) var(--space-8);
    padding-left: calc(var(--space-6) + var(--space-6) + 1.25rem);
}

.layer-card[data-layer-state="collapsed"] .layer-card__body {
    display: none;
}

.layer-card:not([data-layer-state="collapsed"]) .layer-card__body {
    display: block;
}

.layer-card:not([data-layer-state="collapsed"]) .layer-card__toggle {
    transform: rotate(45deg);
}

.layer-card__tier {
    display: none;
    margin-top: var(--space-6);
}

.layer-card__tier:first-child {
    margin-top: 0;
}

/* Tier visibility based on layer state */
.layer-card[data-layer-state="tier-1"] .layer-card__tier[data-tier="1"],
.layer-card[data-layer-state="tier-2"] .layer-card__tier[data-tier="1"],
.layer-card[data-layer-state="tier-2"] .layer-card__tier[data-tier="2"],
.layer-card[data-layer-state="tier-3"] .layer-card__tier[data-tier="1"],
.layer-card[data-layer-state="tier-3"] .layer-card__tier[data-tier="2"],
.layer-card[data-layer-state="tier-3"] .layer-card__tier[data-tier="3"] {
    display: block;
}

.layer-card__tier-text {
    font-size: 1rem;
    color: var(--color-text-muted);
    line-height: 1.65;
}

.layer-card__tier-technical {
    padding: var(--space-4);
    background: var(--color-surface-muted);
    border: 1px solid var(--color-border-faint);
    border-radius: var(--radius);
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    line-height: 1.7;
}

.layer-card__tier-quote {
    font-family: var(--font-serif);
    font-size: 1.125rem;
    font-style: italic;
    color: var(--color-text);
    padding-top: var(--space-4);
    border-top: 1px solid var(--color-border-faint);
    line-height: 1.5;
}

.layer-card__deeper {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    margin-top: var(--space-4);
    padding: 0;
    background: none;
    border: none;
    font-family: var(--font-display);
    font-size: 0.8125rem;
    font-weight: 700;
    color: var(--color-orange);
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: opacity 0.15s ease;
}

.layer-card__deeper:hover {
    opacity: 0.7;
}

.layer-card__deeper .material-symbols-outlined {
    font-size: 1rem;
}

/* Hide "Go deeper" button once its tier is already surpassed */
.layer-card[data-layer-state="tier-2"] .layer-card__tier[data-tier="1"] .layer-card__deeper,
.layer-card[data-layer-state="tier-3"] .layer-card__tier[data-tier="1"] .layer-card__deeper,
.layer-card[data-layer-state="tier-3"] .layer-card__tier[data-tier="2"] .layer-card__deeper {
    display: none;
}

/* Paragraph spacing inside tier content blocks */
.layer-card__tier-text p + p,
.layer-card__tier-method p + p,
.layer-card__tier-civic p + p {
    margin-top: var(--space-4);
}

/* Tier 2 — Methodological Detail */
.layer-card__tier-method {
    padding: var(--space-4) var(--space-5);
    background: var(--color-surface-muted);
    border-left: 3px solid var(--color-primary);
    border-radius: 0 var(--radius) var(--radius) 0;
    font-size: 0.9375rem;
    color: var(--color-text-muted);
    line-height: 1.7;
}

/* Tier 3 — Civic Meaning */
.layer-card__tier-civic {
    font-family: var(--font-serif);
    font-size: 1.0625rem;
    font-style: italic;
    color: var(--color-text);
    padding-top: var(--space-4);
    border-top: 1px solid var(--color-border-faint);
    line-height: 1.6;
}

/* Confidence tier list (Layer 07) */
.layer-card__tier-list {
    list-style: none;
    padding: 0;
    margin: var(--space-4) 0;
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.layer-card__tier-list li {
    padding: var(--space-3) var(--space-4);
    background: var(--color-bg);
    border: 1px solid var(--color-border-faint);
    border-radius: var(--radius);
    font-size: 0.875rem;
    color: var(--color-text-muted);
    line-height: 1.6;
}

/* Pipeline caption */
.pipeline__caption {
    text-align: center;
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    margin-top: var(--space-4);
    letter-spacing: 0.01em;
}

/* Layers section intro */
.layers-section__intro {
    font-style: italic;
    color: var(--color-text-muted);
    font-size: 1rem;
    margin-top: calc(var(--space-2) * -1);
    margin-bottom: var(--space-10);
}

/* ============================================================
   SYSTEM PAGE — CLOSING SECTION
   ============================================================ */
.system-closing {
    padding: var(--space-20) 0;
    background: var(--color-surface-muted);
    border-top: 1px solid var(--color-border-faint);
    text-align: center;
}

.system-closing__title {
    font-family: var(--font-display);
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 800;
    color: var(--color-text);
    margin-bottom: var(--space-4);
    letter-spacing: -0.02em;
}

.system-closing__subtitle {
    font-size: 1rem;
    color: var(--color-text-muted);
    max-width: 56ch;
    margin: 0 auto var(--space-10);
    line-height: 1.65;
}

.system-closing__card-wrap {
    display: flex;
    justify-content: center;
}

/* ============================================================
   SYSTEM PAGE — INLINE CTA
   ============================================================ */
.system-cta {
    padding: var(--space-20) 0;
    background: var(--color-bg);
    border-top: 1px solid var(--color-border-faint);
    text-align: center;
}

.system-cta__title {
    font-family: var(--font-display);
    font-size: clamp(1.5rem, 3vw, 2.25rem);
    font-weight: 800;
    color: var(--color-text);
    margin-bottom: var(--space-6);
    letter-spacing: -0.02em;
}

.system-cta__content {
    max-width: 54ch;
    margin: 0 auto var(--space-8);
    font-size: 1rem;
    color: var(--color-text-muted);
    line-height: 1.7;
    text-align: left;
}

.system-cta__content p + p {
    margin-top: var(--space-4);
}

.system-cta__widget {
    margin-bottom: var(--space-8);
}

.system-cta__badges {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-4);
    margin-top: var(--space-6);
}

/* ============================================================
   CONTENT PAGES — SHARED STYLES
   Used by: TheProblem, TheInvestigation, Updates, Contribute, About
   ============================================================ */
.content-hero {
    padding: var(--space-20) 0 var(--space-16);
    border-bottom: 1px solid var(--color-border-faint);
}

.content-hero__title {
    font-family: var(--font-serif);
    font-size: clamp(1.75rem, 4vw, 2.75rem);
    font-weight: 400;
    color: var(--color-text);
    line-height: 1.2;
    margin-bottom: var(--space-4);
    max-width: 24ch;
}

.content-hero__subtitle {
    font-size: 1.125rem;
    color: var(--color-text-muted);
    line-height: 1.7;
    max-width: 56ch;
}

.content-page {
    padding: var(--space-16) 0 var(--space-20);
}

.content-section {
    margin-bottom: var(--space-16);
}

.content-section__title {
    font-family: var(--font-serif);
    font-size: clamp(1.25rem, 2.5vw, 1.75rem);
    font-weight: 400;
    color: var(--color-text);
    margin-bottom: var(--space-6);
    letter-spacing: -0.01em;
}

.content-section__body {
    font-size: 1.125rem;
    color: var(--color-text-muted);
    line-height: 1.75;
}

.content-section__body p + p {
    margin-top: var(--space-5);
}

.content-section__body a {
    color: var(--color-text);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.content-section__body a:hover {
    color: var(--color-orange);
}

.content-section__list {
    list-style: none;
    padding: 0;
    margin: var(--space-5) 0;
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.content-section__list li {
    padding-left: var(--space-5);
    position: relative;
    line-height: 1.7;
}

.content-section__list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.65em;
    width: 6px;
    height: 6px;
    background: var(--color-orange);
    border-radius: 50%;
}

.content-section__contact {
    margin-top: var(--space-8);
    padding-top: var(--space-6);
    border-top: 1px solid var(--color-border-faint);
}

.content-section--links {
    padding-top: var(--space-8);
    border-top: 1px solid var(--color-border);
}

.content-section--links p {
    margin-bottom: var(--space-3);
}

.content-section--links a {
    font-family: var(--font-display);
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--color-text);
    text-decoration: none;
    transition: color 0.15s ease;
}

.content-section--links a:hover {
    color: var(--color-orange);
}

.content-section--midcta {
    text-align: center;
    padding: var(--space-8) 0;
    border-top: 1px solid var(--color-border-faint);
    border-bottom: 1px solid var(--color-border-faint);
}

/* Confidence Tiers (Investigation, About) */
.confidence-tiers {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    margin: var(--space-6) 0;
}

.confidence-tier {
    padding: var(--space-4) var(--space-5);
    background: var(--color-surface-muted);
    border-left: 3px solid var(--color-primary);
    border-radius: 0 var(--radius) var(--radius) 0;
}

.confidence-tier__title {
    font-family: var(--font-display);
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--color-text);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: var(--space-2);
}

.confidence-tier p {
    font-size: 0.9375rem;
    color: var(--color-text-muted);
    line-height: 1.65;
}

/* ============================================================
   UPDATES PAGE
   ============================================================ */
.status-block {
    padding: var(--space-5) var(--space-6);
    background: var(--color-surface-muted);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-8);
}

.status-block__indicator {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-3);
}

.status-block__pulse {
    width: 10px;
    height: 10px;
    background: var(--color-orange);
    border-radius: 50%;
    animation: pulse-glow 2s ease-in-out infinite;
}

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

.status-block__phase {
    font-family: var(--font-display);
    font-size: 0.8125rem;
    font-weight: 700;
    color: var(--color-text);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.status-block__description {
    font-size: 0.9375rem;
    color: var(--color-text-muted);
    line-height: 1.6;
}

.methodology-note {
    padding: var(--space-5) var(--space-6);
    border-left: 3px solid var(--color-primary);
    background: var(--color-bg-alt);
    margin-bottom: var(--space-12);
}

.methodology-note__title {
    font-family: var(--font-display);
    font-size: 0.8125rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--color-text);
    margin-bottom: var(--space-3);
}

.methodology-note p {
    font-size: 0.9375rem;
    color: var(--color-text-muted);
    line-height: 1.65;
}

.methodology-note p + p {
    margin-top: var(--space-3);
}

.update-log__title {
    font-family: var(--font-serif);
    font-size: clamp(1.25rem, 2.5vw, 1.75rem);
    font-weight: 400;
    color: var(--color-text);
    margin-bottom: var(--space-8);
}

.update-entry {
    padding-bottom: var(--space-10);
    margin-bottom: var(--space-10);
    border-bottom: 1px solid var(--color-border-faint);
}

.update-entry:last-child {
    border-bottom: none;
}

.update-entry__meta {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    margin-bottom: var(--space-3);
}

.update-entry__date {
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    color: var(--color-text-subtle);
}

.update-entry__phase {
    font-family: var(--font-display);
    font-size: 0.6875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--color-orange);
    padding: var(--space-1) var(--space-3);
    background: rgba(249, 115, 22, 0.08);
    border-radius: var(--radius);
}

.update-entry__heading {
    font-family: var(--font-display);
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: var(--space-4);
}

.update-entry__body {
    font-size: 1rem;
    color: var(--color-text-muted);
    line-height: 1.7;
}

.update-entry__body p + p {
    margin-top: var(--space-4);
}

/* Document Index */
.document-index {
    margin-top: var(--space-16);
    padding-top: var(--space-10);
    border-top: 1px solid var(--color-border);
}

.document-index__title {
    font-family: var(--font-serif);
    font-size: clamp(1.25rem, 2.5vw, 1.75rem);
    font-weight: 400;
    color: var(--color-text);
    margin-bottom: var(--space-3);
}

.document-index__note {
    font-size: 0.9375rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-6);
}

.document-index__table-wrap {
    overflow-x: auto;
}

.document-index__table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}

.document-index__table th {
    text-align: left;
    font-family: var(--font-display);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--color-text-subtle);
    padding: var(--space-3) var(--space-4);
    border-bottom: 2px solid var(--color-border);
}

.document-index__table td {
    padding: var(--space-3) var(--space-4);
    border-bottom: 1px solid var(--color-border-faint);
    color: var(--color-text-muted);
}

.document-index__empty td {
    text-align: center;
    padding: var(--space-8) var(--space-4);
    font-style: italic;
    color: var(--color-text-subtle);
}

/* ============================================================
   CONTRIBUTE PAGE
   ============================================================ */
.funding-table-wrap {
    overflow-x: auto;
    margin: var(--space-6) 0;
}

.funding-table {
    width: 100%;
    border-collapse: collapse;
}

.funding-table th {
    text-align: left;
    font-family: var(--font-display);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--color-text-subtle);
    padding: var(--space-3) var(--space-4);
    border-bottom: 2px solid var(--color-border);
}

.funding-table td {
    padding: var(--space-4);
    border-bottom: 1px solid var(--color-border-faint);
    font-size: 1rem;
    color: var(--color-text-muted);
    line-height: 1.6;
    vertical-align: top;
}

.funding-table__threshold {
    font-family: var(--font-display);
    font-weight: 700;
    color: var(--color-text);
    white-space: nowrap;
}

.contribute-cta {
    text-align: center;
    padding: var(--space-12) 0;
    margin-bottom: var(--space-12);
    border-top: 1px solid var(--color-border-faint);
    border-bottom: 1px solid var(--color-border-faint);
}

.contribute-cta__widget {
    margin-bottom: var(--space-8);
}

.contribute-cta__badges {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-4);
    margin-top: var(--space-6);
}

.expertise-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-5);
    margin: var(--space-6) 0;
}

@media (max-width: 640px) {
    .expertise-grid {
        grid-template-columns: 1fr;
    }
}

.expertise-card {
    padding: var(--space-5);
    background: var(--color-surface-muted);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border-faint);
}

.expertise-card__icon {
    font-size: 1.5rem;
    color: var(--color-orange);
    margin-bottom: var(--space-3);
    display: block;
}

.expertise-card__title {
    font-family: var(--font-display);
    font-size: 0.9375rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: var(--space-2);
}

.expertise-card p {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    line-height: 1.6;
}

/* ============================================================
   ABOUT PAGE — PILLARS
   ============================================================ */
.pillars {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-6);
    margin: var(--space-6) 0;
}

@media (max-width: 768px) {
    .pillars {
        grid-template-columns: 1fr;
    }
}

.pillar {
    padding: var(--space-6);
    background: var(--color-surface-muted);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border-faint);
}

.pillar__icon {
    font-size: 1.75rem;
    color: var(--color-orange);
    margin-bottom: var(--space-4);
    display: block;
}

.pillar__title {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: var(--space-3);
}

.pillar p {
    font-size: 0.9375rem;
    color: var(--color-text-muted);
    line-height: 1.65;
}

.pillar a {
    color: var(--color-text);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.pillar a:hover {
    color: var(--color-orange);
}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
    background: var(--color-bg);
    border-top: 1px solid var(--color-border);
    padding: var(--space-16) 0;
}

.site-footer__top {
    display: flex;
    flex-direction: column;
    gap: var(--space-8);
    margin-bottom: var(--space-12);
}

.site-footer__brand {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    color: var(--color-primary);
    text-decoration: none;
}

.site-footer__brand-text {
    font-weight: 700;
    letter-spacing: -0.025em;
}

.site-footer__links {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-8);
}

.site-footer__link {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text);
    text-decoration: none;
    transition: color 0.15s ease;
}

.site-footer__link:hover {
    color: var(--color-primary);
}

.site-footer__bottom {
    color: var(--color-text-faint);
    font-size: 0.75rem;
    line-height: 1.5;
}

.site-footer__bottom p + p {
    margin-top: var(--space-4);
}

@media (min-width: 768px) {
    .site-footer__top {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
    }
}

@media (max-width: 639px) {
    .site-footer {
        padding: var(--space-10) 0;
    }

    .site-footer__top {
        gap: var(--space-6);
    }

    .site-footer__links {
        gap: var(--space-4);
    }
}

/* ============================================================
   ERROR PAGE
   ============================================================ */
.error-page {
    padding: var(--space-16) 0;
    max-width: var(--container-tight);
    margin: 0 auto;
}

.error-page h1,
.error-page h2 {
    margin-bottom: var(--space-4);
}

.error-page p {
    margin-bottom: var(--space-4);
    line-height: 1.7;
}

.error-page code {
    font-family: var(--font-mono);
    background: var(--color-surface-muted);
    padding: var(--space-1) var(--space-2);
    border-radius: var(--radius-sm);
    font-size: 0.875em;
}

/* ============================================================
   UTILITIES
   ============================================================ */
.text-center {
    text-align: center;
}

.text-danger {
    color: var(--color-danger);
}

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

/* ============================================================
   ANIMATIONS
   ============================================================ */
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* ============================================================
   MATERIAL SYMBOLS
   ============================================================ */
.material-symbols-outlined {
    font-variation-settings: 'FILL' 0, 'wght' 400, 'GRAD' 0, 'opsz' 24;
    vertical-align: middle;
}