/* ============================================
   structural-intelligence.css — /structural-intelligence/
   sjbridger.com
   ============================================
   Rules:
   - All classes prefixed .si- to prevent collisions with styles.css
   - No CSS variable fallback values
   - Content width: max-width: 800px on inner content wrappers
   - Outer container: .container (1140px) from styles.css
   ============================================ */


/* ---------- Hero ---------- */

.si-hero {
    padding: clamp(140px, 18vw, 200px) 0 var(--section-padding);
    background: var(--color-bg);
}

.si-hero-eyebrow {
    font-family: var(--font-heading);
    font-size: 0.8125rem;
    font-weight: 500;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: 1rem;
    display: block;
}

.si-hero-title {
    font-family: var(--font-heading);
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 600;
    letter-spacing: -0.02em;
    line-height: 1.15;
    color: var(--color-text-primary);
    margin-bottom: 1.5rem;
    max-width: 800px;
}

.si-hero-body {
    max-width: 800px;
}

.si-hero-body p {
    font-family: var(--font-body);
    font-size: 1.125rem;
    font-weight: 300;
    line-height: 1.75;
    color: var(--color-text-secondary);
    margin-bottom: 1.25rem;
}

.si-hero-body p:last-child {
    margin-bottom: 0;
}


/* ---------- What This Is ---------- */

.si-what {
    padding: var(--section-padding) 0;
    background: var(--color-bg-elevated);
    border-top: 1px solid var(--color-border);
}

.si-what-heading {
    font-family: var(--font-heading);
    font-size: clamp(1.75rem, 3vw, 2.25rem);
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--color-text-primary);
    margin-bottom: 2rem;
    max-width: 800px;
}

.si-what-body {
    max-width: 800px;
}

.si-what-body p {
    font-family: var(--font-body);
    font-size: 1.0625rem;
    font-weight: 300;
    line-height: 1.75;
    color: var(--color-text-secondary);
    margin-bottom: 1.25rem;
}

.si-what-body p:last-child {
    margin-bottom: 0;
}

.si-what-anchor {
    font-weight: 400;
    color: var(--color-text-primary);
}


/* ---------- Methodology Strip ---------- */

.si-method {
    padding: clamp(40px, 6vw, 60px) 0;
    background: var(--color-bg);
    border-top: 1px solid var(--color-border);
}

.si-method-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0;
    max-width: 800px;
}

.si-method-item {
    padding: 1.5rem 1.25rem;
    border-right: 1px solid var(--color-border);
}

.si-method-item:last-child {
    border-right: none;
}

.si-method-number {
    font-family: var(--font-heading);
    font-size: 0.6875rem;
    font-weight: 500;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: 0.5rem;
    display: block;
}

.si-method-label {
    font-family: var(--font-heading);
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: 0.375rem;
}

.si-method-detail {
    font-family: var(--font-body);
    font-size: 0.875rem;
    font-weight: 300;
    line-height: 1.6;
    color: var(--color-text-muted);
}

@media (max-width: 640px) {
    .si-method-grid {
        grid-template-columns: 1fr 1fr;
    }
    .si-method-item {
        border-bottom: 1px solid var(--color-border);
    }
    .si-method-item:nth-child(2) {
        border-right: none;
    }
    .si-method-item:nth-child(3),
    .si-method-item:nth-child(4) {
        border-bottom: none;
    }
}


/* ---------- Sector Grid ---------- */

.si-sectors {
    padding: var(--section-padding) 0;
    background: var(--color-bg-elevated);
    border-top: 1px solid var(--color-border);
}

.si-sectors-heading {
    font-family: var(--font-heading);
    font-size: clamp(1.75rem, 3vw, 2.25rem);
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--color-text-primary);
    margin-bottom: 0.5rem;
}

.si-sectors-subhead {
    font-family: var(--font-body);
    font-size: 1.0625rem;
    font-weight: 300;
    font-style: italic;
    color: var(--color-text-secondary);
    max-width: 800px;
    margin-bottom: 3rem;
}

.si-tier-group {
    margin-bottom: 3rem;
}

.si-tier-group:last-child {
    margin-bottom: 0;
}

.si-tier-label {
    font-family: var(--font-heading);
    font-size: 0.6875rem;
    font-weight: 500;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: 1.25rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--color-border);
    display: block;
}

.si-sector-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1px;
    background: var(--color-border);
}

@media (max-width: 900px) {
    .si-sector-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 540px) {
    .si-sector-grid {
        grid-template-columns: 1fr;
    }
}

.si-sector-card {
    background: var(--color-bg-card);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    transition: background var(--transition-fast);
}

.si-sector-card:hover {
    background: var(--color-surface);
}

.si-sector-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 0.5rem;
}

.si-sector-name {
    font-family: var(--font-heading);
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text-primary);
    line-height: 1.3;
}

.si-sector-naics {
    font-family: var(--font-mono);
    font-size: 0.6875rem;
    color: var(--color-text-dim);
    white-space: nowrap;
}

.si-sector-frequencies {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.375rem;
}

.si-freq-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.si-freq-label {
    font-family: var(--font-heading);
    font-size: 0.6875rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-text-dim);
    min-width: 20px;
}

.si-freq-band {
    font-family: var(--font-heading);
    font-size: 0.75rem;
    font-weight: 500;
    padding: 2px 8px;
    border-radius: 2px;
}

/* Severity band colors — muted, structural, not alarming */
.si-band-robust     { background: rgba(76, 175, 80, 0.12); color: #81c784; }
.si-band-stable     { background: rgba(76, 175, 80, 0.08); color: #a5d6a7; }
.si-band-strained   { background: rgba(255, 193, 7, 0.10); color: #ffd54f; }
.si-band-fragile    { background: rgba(255, 152, 0, 0.10); color: #ffb74d; }
.si-band-critical   { background: rgba(244, 67, 54, 0.10); color: #ef9a9a; }
.si-band-severe     { background: rgba(244, 67, 54, 0.15); color: #e57373; }
.si-band-forthcoming { background: rgba(255, 255, 255, 0.04); color: var(--color-text-dim); font-style: italic; }

.si-sector-metrics {
    font-family: var(--font-body);
    font-size: 0.8125rem;
    color: var(--color-text-dim);
    font-weight: 300;
}


/* ---------- Unmeasurable ---------- */

.si-unmeasurable {
    padding: var(--section-padding) 0;
    background: var(--color-bg);
    border-top: 1px solid var(--color-border);
}

.si-unmeasurable-heading {
    font-family: var(--font-heading);
    font-size: clamp(1.75rem, 3vw, 2.25rem);
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--color-text-primary);
    margin-bottom: 0.5rem;
    max-width: 800px;
}

.si-unmeasurable-subhead {
    font-family: var(--font-body);
    font-size: 1.0625rem;
    font-weight: 300;
    font-style: italic;
    color: var(--color-text-secondary);
    max-width: 800px;
    margin-bottom: 2.5rem;
}

.si-unmeasurable-body {
    max-width: 800px;
}

.si-unmeasurable-body p {
    font-family: var(--font-body);
    font-size: 1.0625rem;
    font-weight: 300;
    line-height: 1.75;
    color: var(--color-text-secondary);
    margin-bottom: 1.25rem;
}

.si-unmeasurable-list {
    max-width: 800px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
    margin: 2rem 0;
}

@media (max-width: 540px) {
    .si-unmeasurable-list {
        grid-template-columns: 1fr;
    }
}

.si-unmeasurable-item {
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--color-border);
}

.si-unmeasurable-item:nth-child(odd) {
    border-right: 1px solid var(--color-border);
}

@media (max-width: 540px) {
    .si-unmeasurable-item:nth-child(odd) {
        border-right: none;
    }
}

.si-unmeasurable-dim {
    font-family: var(--font-heading);
    font-size: 0.6875rem;
    font-weight: 500;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: 0.25rem;
    display: block;
}

.si-unmeasurable-name {
    font-family: var(--font-heading);
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: 0.25rem;
}

.si-unmeasurable-why {
    font-family: var(--font-body);
    font-size: 0.8125rem;
    font-weight: 300;
    color: var(--color-text-muted);
    line-height: 1.5;
}


/* ---------- Structural Intelligence Briefs (Gated CTA) ---------- */

.si-briefs {
    padding: var(--section-padding) 0;
    background: var(--color-bg-elevated);
    border-top: 1px solid var(--color-border);
}

.si-briefs-heading {
    font-family: var(--font-heading);
    font-size: clamp(1.75rem, 3vw, 2.25rem);
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--color-text-primary);
    margin-bottom: 2rem;
    max-width: 800px;
}

.si-briefs-body {
    max-width: 800px;
    margin-bottom: 2.5rem;
}

.si-briefs-body p {
    font-family: var(--font-body);
    font-size: 1.0625rem;
    font-weight: 300;
    line-height: 1.75;
    color: var(--color-text-secondary);
    margin-bottom: 1.25rem;
}

.si-briefs-body p:last-child {
    margin-bottom: 0;
}

.si-brief-preview {
    max-width: 800px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    padding: 2rem;
}

.si-brief-preview-label {
    font-family: var(--font-heading);
    font-size: 0.6875rem;
    font-weight: 500;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: 0.75rem;
    display: block;
}

.si-brief-preview-title {
    font-family: var(--font-heading);
    font-size: 1.375rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: 1rem;
}

.si-brief-preview-contents {
    font-family: var(--font-body);
    font-size: 0.9375rem;
    font-weight: 300;
    line-height: 1.7;
    color: var(--color-text-secondary);
    margin-bottom: 1.5rem;
}

.si-brief-email-form {
    display: flex;
    gap: 0;
    max-width: 480px;
}

.si-brief-email-input {
    flex: 1;
    font-family: var(--font-heading);
    font-size: 0.875rem;
    padding: 12px 16px;
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border-light);
    border-right: none;
    color: var(--color-text-primary);
    outline: none;
    transition: border-color var(--transition-fast);
}

.si-brief-email-input::placeholder {
    color: var(--color-text-dim);
}

.si-brief-email-input:focus {
    border-color: var(--color-accent);
}

.si-brief-email-submit {
    font-family: var(--font-heading);
    font-size: 0.875rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    padding: 12px 24px;
    background: var(--color-accent);
    color: var(--color-bg);
    border: 1px solid var(--color-accent);
    cursor: pointer;
    white-space: nowrap;
    transition: all 0.25s var(--ease-out);
}

.si-brief-email-submit:hover {
    background: #e8c04a;
    border-color: #e8c04a;
    box-shadow: 0 0 24px rgba(201, 162, 39, 0.25);
}


/* ---------- Case Study Connection ---------- */

.si-cases {
    padding: var(--section-padding) 0;
    background: var(--color-bg);
    border-top: 1px solid var(--color-border);
}

.si-cases-heading {
    font-family: var(--font-heading);
    font-size: clamp(1.75rem, 3vw, 2.25rem);
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--color-text-primary);
    margin-bottom: 0.5rem;
    max-width: 800px;
}

.si-cases-subhead {
    font-family: var(--font-body);
    font-size: 1.0625rem;
    font-weight: 300;
    font-style: italic;
    color: var(--color-text-secondary);
    max-width: 800px;
    margin-bottom: 2.5rem;
}

.si-cases-body {
    max-width: 800px;
}

.si-cases-body p {
    font-family: var(--font-body);
    font-size: 1.0625rem;
    font-weight: 300;
    line-height: 1.75;
    color: var(--color-text-secondary);
    margin-bottom: 1.25rem;
}

.si-case-links {
    max-width: 800px;
    margin-top: 2rem;
    display: flex;
    flex-direction: column;
    gap: 0;
}

.si-case-link {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
    border-bottom: 1px solid var(--color-border);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.si-case-link:first-child {
    border-top: 1px solid var(--color-border);
}

.si-case-link:hover {
    padding-left: 0.5rem;
}

.si-case-link-name {
    font-family: var(--font-heading);
    font-size: 1rem;
    font-weight: 500;
    color: var(--color-text-primary);
    transition: color var(--transition-fast);
}

.si-case-link:hover .si-case-link-name {
    color: var(--color-accent);
}

.si-case-link-sector {
    font-family: var(--font-heading);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-text-dim);
}


/* ---------- CTA Footer ---------- */

.si-cta {
    padding: var(--section-padding) 0;
    background: var(--color-bg-elevated);
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.si-cta-heading {
    font-family: var(--font-heading);
    font-size: clamp(1.75rem, 3vw, 2.25rem);
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--color-text-primary);
    margin-bottom: 1rem;
}

.si-cta-body {
    font-family: var(--font-body);
    font-size: 1.0625rem;
    font-weight: 300;
    line-height: 1.7;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto 2rem;
}

.si-cta-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}