:root {
    /* Colors */
    --primary-color: #0F172A;
    --secondary-color: #3B82F6;
    --accent-color: #0EA5E9;
    --text-color: #334155;
    --light-bg: #F8FAFC;
    --white: #FFFFFF;
    --border-color: #E2E8F0;

    /* Spacing — used by .section-padding below */
    --section-spacing: 5rem;

    /* Typography */
    --font-stack: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", Inter, Segoe UI, Roboto, Helvetica, Arial;
    --font-heading: var(--font-stack);
    --font-body: var(--font-stack);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-body);
    color: var(--text-color);
    line-height: 1.6;
    background-color: var(--white);
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-heading);
    color: var(--primary-color);
    line-height: 1.2;
    margin-bottom: 1rem;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.3s ease;
}

ul {
    list-style: none;
}

/* Hero Buttons (about-us hero CTA row) */
.hero-buttons {
    display: flex;
    gap: 1rem;
    margin-bottom: 0;
    justify-content: center;
}

/* Section vertical spacing utility */
.section-padding {
    padding: var(--section-spacing) 0;
}

/* ============================================================
   ABOUT US PAGE STYLES
   Shared layout (container, btn) comes from assets/styles.css.
   Page-specific backgrounds, typography, and components follow.
============================================================ */

/* About Hero Section */
.about-hero {
    text-align: center;
    padding-top: 140px;
    padding-bottom: 4rem;
    background: linear-gradient(135deg, var(--light-bg) 0%, var(--white) 100%);
}

.about-hero-content {
    max-width: 900px;
    margin: 0 auto;
}

.hero-eyebrow {
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    color: var(--text-color);
    margin-bottom: 1.5rem;
    text-transform: uppercase;
}

.about-hero h1 {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    letter-spacing: -0.03em;
    line-height: 1.1;
    max-width: none;
}

.hero-subheadline {
    font-size: 18px;
    color: #64748B;
    margin-bottom: 2.5rem;
    line-height: 1.7;
}

.credibility-strip {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-top: 2.5rem;
    flex-wrap: wrap;
}

.credibility-strip span {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-color);
    padding: 0.5rem 1rem;
    background-color: var(--light-bg);
    border-radius: 6px;
}

/* Mission Section */
.mission-section {
    background-color: var(--white);
    text-align: center;
}

.mission-section h2 {
    font-size: 2.5rem;
    margin-bottom: 3rem;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.mission-content {
    max-width: 800px;
    margin: 0 auto;
}

.mission-content p {
    font-size: 1.15rem;
    color: var(--text-color);
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

.mission-emphasis {
    font-weight: 700;
    color: var(--primary-color);
    margin-top: 2rem;
}

/* Why Trinzz Section */
.why-trinzz-section {
    background-color: var(--light-bg);
    text-align: center;
}

.why-trinzz-section h2 {
    font-size: 2.5rem;
    margin-bottom: 3rem;
}

.why-cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.why-card {
    background: white;
    padding: 2.5rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
    border: 1px solid var(--border-color);
    text-align: left;
}

.why-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.why-card p {
    font-size: 1.05rem;
    color: #64748B;
    line-height: 1.7;
}

.why-conclusion {
    max-width: 800px;
    margin: 0 auto;
    font-size: 1.15rem;
    color: var(--text-color);
    line-height: 1.8;
}

/* What We Build Section */
.what-we-build-section {
    background-color: var(--white);
    text-align: center;
}

.what-we-build-section h2 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
}

.section-intro {
    font-size: 1.15rem;
    color: var(--text-color);
    max-width: 800px;
    margin: 0 auto 3rem;
    line-height: 1.8;
}

.capabilities-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    max-width: 1000px;
    margin: 0 auto 3rem;
}

.capability-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.25rem;
    background-color: var(--light-bg);
    border-radius: 8px;
    text-align: left;
}

.capability-item svg {
    width: 32px;
    height: 32px;
    color: var(--secondary-color);
    flex-shrink: 0;
}

.capability-item span {
    font-size: 1rem;
    color: var(--text-color);
    font-weight: 500;
}

.positioning-statement {
    max-width: 600px;
    margin: 3rem auto 0;
    padding: 2rem;
    background-color: var(--light-bg);
    border-radius: 12px;
    border-left: 4px solid var(--secondary-color);
}

.positioning-line {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    line-height: 1.5;
}

/* Standards Section */
.standards-section {
    background-color: var(--light-bg);
}

.standards-section h2 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    text-align: center;
}

.standards-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: start;
    margin-top: 3rem;
}

.standards-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.standard-item {
    display: flex;
    flex-direction: column;
    padding: 1.5rem;
    background-color: white;
    border-radius: 8px;
    border-left: 4px solid var(--secondary-color);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.standard-metric {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.25rem;
}

.standard-desc {
    font-size: 1rem;
    color: #64748B;
}

.standards-whitepaper {
    position: sticky;
    top: 100px;
}

.whitepaper-placeholder {
    background: white;
    padding: 3rem;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    border: 1px solid var(--border-color);
}

.whitepaper-placeholder h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.whitepaper-placeholder p {
    color: #64748B;
    margin-bottom: 2rem;
    line-height: 1.7;
}

.whitepaper-btn {
    width: 100%;
}

.standards-conclusion {
    text-align: center;
    max-width: 900px;
    margin: 3rem auto 0;
    font-size: 1.15rem;
    color: var(--text-color);
    line-height: 1.8;
}

/* Reliability Section */
.reliability-section {
    background-color: var(--white);
    text-align: center;
}

.reliability-section h2 {
    font-size: 2.5rem;
    margin-bottom: 3rem;
}

.layers-container {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.layer-block {
    display: flex;
    align-items: center;
    gap: 2rem;
    padding: 2rem;
    background: linear-gradient(135deg, var(--light-bg) 0%, white 100%);
    border-radius: 12px;
    border: 2px solid var(--border-color);
    text-align: left;
    transition: transform 0.2s, box-shadow 0.2s;
}

.layer-block:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 16px -4px rgba(0, 0, 0, 0.1);
}

.layer-number {
    font-size: 3rem;
    font-weight: 800;
    color: var(--secondary-color);
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: white;
    border-radius: 50%;
    flex-shrink: 0;
    border: 3px solid var(--secondary-color);
}

.layer-content h3 {
    font-size: 1.35rem;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.layer-content p {
    font-size: 1rem;
    color: #64748B;
}

.reliability-conclusion {
    max-width: 800px;
    margin: 3rem auto 0;
    font-size: 1.15rem;
    color: var(--text-color);
    line-height: 1.8;
}

/* Enterprise Section (about-us version) */
.enterprise-section {
    background-color: var(--light-bg);
    text-align: center;
}

.enterprise-section h2 {
    font-size: 2.5rem;
    margin-bottom: 2rem;
}

.enterprise-content {
    max-width: 800px;
    margin: 0 auto;
}

.enterprise-content p {
    font-size: 1.15rem;
    color: var(--text-color);
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

/* Founder Section */
.founder-section {
    background-color: var(--white);
}

.founder-section h2 {
    font-size: 2.5rem;
    margin-bottom: 3rem;
    text-align: center;
}

.founder-card {
    max-width: 900px;
    margin: 0 auto;
    background: white;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}

.founder-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 2rem;
    cursor: pointer;
    transition: background-color 0.2s;
}

.founder-header:hover {
    background-color: var(--light-bg);
}

.founder-info h3 {
    font-size: 1.75rem;
    margin-bottom: 0.5rem;
}

.founder-title {
    font-size: 1.1rem;
    color: #64748B;
    font-weight: 500;
}

.expand-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    transition: transform 0.3s;
}

.expand-icon {
    width: 32px;
    height: 32px;
    color: var(--secondary-color);
    transition: transform 0.3s;
}

.expand-icon.rotated {
    transform: rotate(180deg);
}

.founder-bio {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
    padding: 0 2rem;
}

.founder-bio.expanded {
    max-height: 1000px;
    padding: 0 2rem 2rem 2rem;
}

.founder-bio p {
    font-size: 1.05rem;
    color: var(--text-color);
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

/* Final CTA Section */
.final-cta-section {
    background: linear-gradient(135deg, var(--secondary-color) 0%, var(--accent-color) 100%);
    color: white;
    text-align: center;
}

.final-cta-content h2 {
    font-size: 3rem;
    color: white;
    margin-bottom: 1rem;
}

.final-cta-content p {
    font-size: 1.25rem;
    margin-bottom: 2.5rem;
    opacity: 0.95;
}

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

.cta-buttons .btn-primary {
    background-color: white;
    color: var(--secondary-color);
    font-weight: 600;
}

.cta-buttons .btn-primary:hover {
    background-color: var(--light-bg);
    transform: translateY(-2px);
    box-shadow: 0 8px 16px -4px rgba(0, 0, 0, 0.2);
}

/* Responsive Styles for About Page */
@media (max-width: 768px) {
    .about-hero h1 {
        font-size: 2.5rem;
    }

    .hero-subheadline {
        font-size: 16px;
    }

    .credibility-strip {
        gap: 1rem;
    }

    .why-cards-grid {
        grid-template-columns: 1fr;
    }

    .capabilities-grid {
        grid-template-columns: 1fr;
    }

    .standards-layout {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .standards-whitepaper {
        position: static;
    }

    .layers-container {
        gap: 1rem;
    }

    .layer-block {
        flex-direction: column;
        text-align: center;
        padding: 1.5rem;
    }

    .layer-number {
        width: 60px;
        height: 60px;
        font-size: 2rem;
    }

    .final-cta-content h2 {
        font-size: 2rem;
    }

    .final-cta-content p {
        font-size: 1.1rem;
    }
}