/* ============================================================
   ANDREW HEIGHINGTON — PROFESSIONAL WEBSITE
   Design System & Complete Styles
   ============================================================ */

/* ---------- DESIGN TOKENS ---------- */
:root {
    /* Backgrounds */
    --bg-primary: #0D1117;
    --bg-secondary: #161B22;
    --bg-tertiary: #1C2128;
    --bg-elevated: #21262D;

    /* Text */
    --text-primary: #E6EDF3;
    --text-bright: #FFFFFF;
    --text-muted: #8B949E;
    --text-faint: #484F58;

    /* Accent Gradient */
    --accent-blue: #58A6FF;
    --accent-cyan: #39D0D8;
    --gradient-accent: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));

    /* Gold (awards only) */
    --gold: #D4A843;
    --gold-glow: rgba(212, 168, 67, 0.15);

    /* Typography */
    --font-display: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-body: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;
    --font-serif: 'Source Serif 4', Georgia, 'Times New Roman', serif;

    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2.5rem;
    --space-xl: 4rem;
    --space-2xl: 6rem;
    --space-3xl: 8rem;

    /* Layout */
    --max-width: 1200px;
    --nav-height: 64px;

    /* Transitions */
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
    --duration-fast: 0.2s;
    --duration-med: 0.4s;
    --duration-slow: 0.8s;

    /* Borders */
    --border-subtle: 1px solid rgba(139, 148, 158, 0.1);
    --border-accent: 1px solid rgba(88, 166, 255, 0.2);
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    font-size: 16px;
}

body {
    font-family: var(--font-body);
    font-weight: 400;
    line-height: 1.65;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    overflow-x: hidden;
}

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

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

button {
    border: none;
    background: none;
    cursor: pointer;
    font-family: inherit;
    color: inherit;
}

/* ---------- SHARED / UTILITY ---------- */
.section-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 4vw, 2.75rem);
    font-weight: 800;
    color: var(--text-bright);
    letter-spacing: -0.03em;
    margin-bottom: var(--space-sm);
}

.section-subtitle {
    color: var(--text-muted);
    font-size: 1.05rem;
    max-width: 560px;
    margin-bottom: var(--space-xl);
}

/* Gradient text utility */
.gradient-text {
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ---------- BUTTONS ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.85rem 1.75rem;
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 0.925rem;
    border-radius: var(--radius-sm);
    transition: all var(--duration-fast) var(--ease-smooth);
    letter-spacing: 0.01em;
    cursor: pointer;
}

.btn--primary {
    background: var(--gradient-accent);
    color: var(--bg-primary);
    border: none;
}

.btn--primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(88, 166, 255, 0.25);
}

.btn--ghost {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid rgba(139, 148, 158, 0.3);
}

.btn--ghost:hover {
    border-color: var(--accent-blue);
    color: var(--text-bright);
    transform: translateY(-2px);
}

.btn--small {
    padding: 0.65rem 1.35rem;
    font-size: 0.85rem;
}

/* ============================================================
   1. NAVIGATION
   ============================================================ */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 0 var(--space-lg);
    height: var(--nav-height);
    background: rgba(13, 17, 23, 0.8);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: var(--border-subtle);
    transform: translateY(-100%);
    transition: transform var(--duration-med) var(--ease-out);
}

.nav--visible {
    transform: translateY(0);
}

.nav__inner {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.nav__name {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1rem;
    color: var(--text-bright);
    letter-spacing: -0.02em;
}

.nav__links {
    display: flex;
    gap: var(--space-md);
}

.nav__link {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-muted);
    transition: color var(--duration-fast);
    position: relative;
    padding: 0.25rem 0;
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gradient-accent);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--duration-fast) var(--ease-out);
}

.nav__link:hover,
.nav__link--active {
    color: var(--text-bright);
}

.nav__link:hover::after,
.nav__link--active::after {
    transform: scaleX(1);
}

.nav__hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 4px;
}

.nav__hamburger span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text-primary);
    transition: all var(--duration-fast) var(--ease-smooth);
    border-radius: 1px;
}

.nav__hamburger--open span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}
.nav__hamburger--open span:nth-child(2) {
    opacity: 0;
}
.nav__hamburger--open span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Menu */
.mobile-menu {
    position: fixed;
    inset: 0;
    z-index: 99;
    background: rgba(13, 17, 23, 0.95);
    backdrop-filter: blur(24px);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--duration-med) var(--ease-smooth);
}

.mobile-menu--open {
    opacity: 1;
    pointer-events: all;
}

.mobile-menu__inner {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
    text-align: center;
}

.mobile-menu__link {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-bright);
    letter-spacing: -0.02em;
    transition: color var(--duration-fast);
}

.mobile-menu__link:hover {
    color: var(--accent-blue);
}

/* ============================================================
   2. HERO
   ============================================================ */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-3xl) var(--space-lg);
    position: relative;
    overflow: hidden;
    gap: var(--space-xl);
    max-width: calc(var(--max-width) + var(--space-lg) * 2);
    margin: 0 auto;
}

.hero__content {
    flex: 1;
    max-width: 640px;
}

.hero__label {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--accent-blue);
    margin-bottom: var(--space-md);
    opacity: 0;
}

.hero__name {
    font-family: var(--font-display);
    font-size: clamp(3.25rem, 7vw, 5.5rem);
    font-weight: 800;
    line-height: 0.95;
    letter-spacing: -0.04em;
    color: var(--text-bright);
    margin-bottom: var(--space-md);
    opacity: 0;
}

.hero__tagline {
    font-size: clamp(1.05rem, 1.8vw, 1.2rem);
    color: var(--text-muted);
    line-height: 1.6;
    margin-bottom: var(--space-lg);
    max-width: 520px;
    opacity: 0;
}

.hero__institutions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: var(--space-lg);
    opacity: 0;
}

.hero__inst {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
}

.hero__inst-sep {
    color: var(--text-faint);
    font-size: 0.7rem;
}

.hero__ctas {
    display: flex;
    gap: var(--space-sm);
    opacity: 0;
}

/* Hero Photo */
.hero__photo {
    flex: 0 0 auto;
    position: relative;
    opacity: 0;
}

.hero__photo-frame {
    width: 340px;
    height: 420px;
    border-radius: var(--radius-lg);
    overflow: hidden;
    position: relative;
    z-index: 1;
    border: 1px solid rgba(88, 166, 255, 0.15);
}

.hero__photo-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero__photo-placeholder {
    width: 100%;
    height: 100%;
    background: var(--bg-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero__photo-placeholder span {
    font-family: var(--font-display);
    font-size: 4rem;
    font-weight: 800;
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    opacity: 0.4;
}

.hero__photo-accent {
    position: absolute;
    top: -20px;
    right: -20px;
    width: 100%;
    height: 100%;
    border-radius: var(--radius-lg);
    border: 1px solid rgba(88, 166, 255, 0.08);
    z-index: 0;
}

/* Scroll Indicator */
.hero__scroll-indicator {
    position: absolute;
    bottom: 2.5rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    opacity: 0;
}

.hero__scroll-indicator span {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: var(--text-faint);
}

.hero__scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, var(--accent-blue), transparent);
    animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
    0%, 100% { opacity: 0.3; transform: scaleY(0.7); }
    50% { opacity: 1; transform: scaleY(1); }
}

/* ============================================================
   3. TRUST BAR
   ============================================================ */
.trust-bar {
    padding: var(--space-md) var(--space-lg);
    background: var(--bg-secondary);
    border-top: var(--border-subtle);
    border-bottom: var(--border-subtle);
}

.trust-bar__inner {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xl);
}

.trust-bar__label {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--text-faint);
    white-space: nowrap;
}

.trust-bar__logos {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
}

.trust-bar__logo {
    opacity: 0.45;
    transition: opacity var(--duration-fast);
    display: flex;
    align-items: center;
}

.trust-bar__logo:hover {
    opacity: 0.8;
}

.trust-bar__logo-svg {
    height: 28px;
    width: auto;
    color: var(--text-primary);
}

.trust-bar__logo-text {
    font-size: 1.35rem;
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
}

.trust-bar__logo-text--serif {
    font-family: var(--font-serif);
    font-style: italic;
}

.trust-bar__logo-text--sans {
    font-family: var(--font-display);
    font-weight: 700;
}

/* ============================================================
   4. ABOUT
   ============================================================ */
.about {
    padding: var(--space-3xl) var(--space-lg);
    background: var(--bg-primary);
}

.about__inner {
    max-width: 840px;
    margin: 0 auto;
    text-align: center;
}

.about__text {
    font-size: clamp(1.1rem, 2vw, 1.3rem);
    line-height: 1.7;
    color: var(--text-primary);
    margin-bottom: var(--space-md);
}

.about__text--secondary {
    color: var(--text-muted);
    font-size: clamp(1rem, 1.6vw, 1.1rem);
    margin-bottom: var(--space-2xl);
}

.about__pillars {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-md);
}

.about__pillar {
    padding: var(--space-md);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    text-align: center;
    position: relative;
    overflow: hidden;
    border: var(--border-subtle);
    transition: border-color var(--duration-fast), transform var(--duration-fast);
}

.about__pillar::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-accent);
    opacity: 0.6;
}

.about__pillar:hover {
    border-color: rgba(88, 166, 255, 0.15);
    transform: translateY(-4px);
}

.about__pillar-icon {
    color: var(--accent-blue);
    margin-bottom: var(--space-sm);
    display: flex;
    justify-content: center;
}

.about__pillar-title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 0.95rem;
    color: var(--text-bright);
    margin-bottom: var(--space-xs);
}

.about__pillar-desc {
    font-size: 0.8rem;
    color: var(--text-muted);
    line-height: 1.5;
}

/* ============================================================
   5. CAREER JOURNEY
   ============================================================ */
.career {
    padding: var(--space-3xl) var(--space-lg);
    background: var(--bg-secondary);
}

.career__header {
    max-width: var(--max-width);
    margin: 0 auto var(--space-2xl);
}

.career__timeline {
    max-width: var(--max-width);
    margin: 0 auto;
    position: relative;
}

/* Signal Line */
.career__signal-line {
    position: absolute;
    left: 24px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: rgba(139, 148, 158, 0.1);
}

.career__signal-progress {
    width: 100%;
    height: 0%;
    background: var(--gradient-accent);
    transition: height 0.1s linear;
    border-radius: 1px;
    box-shadow: 0 0 12px rgba(88, 166, 255, 0.3);
}

/* Chapter */
.career__chapter {
    display: flex;
    gap: var(--space-xl);
    padding-bottom: var(--space-2xl);
    position: relative;
    padding-left: 64px;
}

.career__chapter:last-child {
    padding-bottom: 0;
}

/* Node */
.career__node {
    position: absolute;
    left: 0;
    top: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.career__node-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--bg-secondary);
    border: 2px solid var(--text-faint);
    position: relative;
    left: 19px;
    z-index: 2;
    transition: all var(--duration-med) var(--ease-out);
}

.career__chapter--active .career__node-dot {
    border-color: var(--accent-blue);
    background: var(--accent-blue);
    box-shadow: 0 0 16px rgba(88, 166, 255, 0.4);
}

.career__content-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-xs);
}

.career__node-year {
    font-family: var(--font-mono);
    font-size: 0.82rem;
    color: var(--accent-blue);
    letter-spacing: 0.04em;
    white-space: nowrap;
    opacity: 0.85;
}

/* Content */
.career__content {
    flex: 1;
    padding: var(--space-lg);
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    border: var(--border-subtle);
    transition: border-color var(--duration-fast), transform var(--duration-fast);
    margin-left: var(--space-lg);
}

.career__content:hover {
    border-color: rgba(88, 166, 255, 0.12);
}

.career__chapter-label {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--accent-blue);
}

.career__title {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--text-bright);
    letter-spacing: -0.03em;
    margin-bottom: var(--space-xs);
}

.career__org {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.career__role {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: var(--space-md);
}

/* Stats */
.career__stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-sm);
}

.career__stat {
    padding: var(--space-sm);
    background: rgba(13, 17, 23, 0.5);
    border-radius: var(--radius-sm);
    border: var(--border-subtle);
}

.career__stat-number {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 600;
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: block;
    margin-bottom: 0.15rem;
}

.career__stat-value {
    font-size: 0.85rem;
    color: var(--text-primary);
    line-height: 1.4;
    display: block;
}

.career__stat-label {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-faint);
    display: block;
    margin-top: 0.25rem;
}

/* Badge (SecDef Medal) */
.career__badge {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    margin-top: var(--space-md);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 600;
}

.career__badge--gold {
    background: var(--gold-glow);
    color: var(--gold);
    border: 1px solid rgba(212, 168, 67, 0.2);
}

/* ============================================================
   6. IMPACT METRICS
   ============================================================ */
.metrics {
    padding: var(--space-3xl) var(--space-lg);
    background: var(--bg-primary);
    position: relative;
    overflow: hidden;
}

.metrics::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(88, 166, 255, 0.04), transparent 70%);
    pointer-events: none;
}

.metrics__inner {
    max-width: var(--max-width);
    margin: 0 auto;
    text-align: center;
}

.metrics__inner .section-title {
    margin-bottom: var(--space-2xl);
}

.metrics__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
}

.metrics__item {
    padding: var(--space-lg);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    border: var(--border-subtle);
    transition: transform var(--duration-fast), border-color var(--duration-fast);
}

.metrics__item:hover {
    transform: translateY(-4px);
    border-color: rgba(88, 166, 255, 0.12);
}

.metrics__number {
    font-family: var(--font-mono);
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 600;
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: block;
    line-height: 1.1;
    margin-bottom: var(--space-xs);
}

.metrics__label {
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.4;
}

/* ============================================================
   7. FEATURED IN THE PRESS
   ============================================================ */
.press {
    padding: var(--space-2xl) var(--space-lg);
    background: var(--bg-secondary);
    position: relative;
}

.press__bg-pattern {
    position: absolute;
    inset: 0;
    z-index: 0;
    background-image:
        radial-gradient(circle at 20% 30%, rgba(88, 166, 255, 0.03) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(57, 208, 216, 0.03) 0%, transparent 50%);
    pointer-events: none;
}

.press__inner {
    max-width: var(--max-width);
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.press__grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
    margin-bottom: var(--space-md);
}

.press__card {
    padding: var(--space-lg);
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    border: var(--border-subtle);
    transition: all var(--duration-med) var(--ease-out);
    display: flex;
    flex-direction: column;
}

.press__card:hover {
    border-color: rgba(88, 166, 255, 0.15);
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.press__pub {
    margin-bottom: var(--space-md);
}

.press__pub-logo {
    color: var(--text-muted);
    opacity: 0.7;
    font-size: 1.1rem;
    font-weight: 600;
}

.press__pub-logo--serif {
    font-family: var(--font-serif);
    font-style: italic;
}

.press__pub-logo--sans {
    font-family: var(--font-display);
    font-weight: 700;
}

.press__headline {
    font-family: var(--font-serif);
    font-size: 1.1rem;
    font-weight: 600;
    font-style: italic;
    color: var(--text-bright);
    line-height: 1.4;
    margin-bottom: var(--space-sm);
}

.press__context {
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.5;
    margin-bottom: var(--space-sm);
    flex: 1;
}

.press__read-more {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-display);
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--accent-blue);
    margin-top: auto;
    cursor: pointer;
    transition: gap var(--duration-fast);
}

.press__read-more:hover {
    gap: 0.75rem;
}

.press__read-more svg {
    transition: transform var(--duration-fast);
}

.press__card:hover .press__read-more svg {
    transform: translateX(3px);
}

/* Additional Publications */
.press__additional {
    border-top: var(--border-subtle);
    padding-top: var(--space-md);
}

.press__additional-label {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--text-faint);
    display: block;
    margin-bottom: var(--space-sm);
}

.press__additional-item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-xs);
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.4;
    padding: var(--space-xs) 0;
}

.press__additional-item svg {
    flex-shrink: 0;
    margin-top: 3px;
    color: var(--text-faint);
}

/* ============================================================
   8. EXPERTISE
   ============================================================ */
.expertise {
    padding: var(--space-3xl) var(--space-lg);
    background: var(--bg-primary);
}

.expertise__inner {
    max-width: var(--max-width);
    margin: 0 auto;
}

.expertise__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
}

.expertise__card {
    padding: var(--space-lg);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    border: var(--border-subtle);
    transition: all var(--duration-med) var(--ease-out);
    position: relative;
}

.expertise__card::before {
    content: '';
    position: absolute;
    inset: -1px;
    border-radius: var(--radius-md);
    padding: 1px;
    background: var(--gradient-accent);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: opacity var(--duration-med);
    pointer-events: none;
}

.expertise__card:hover::before {
    opacity: 1;
}

.expertise__card:hover {
    transform: translateY(-4px);
    background: var(--bg-tertiary);
}

.expertise__icon {
    color: var(--accent-blue);
    margin-bottom: var(--space-sm);
}

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

.expertise__tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
}

.expertise__tags span {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    padding: 0.3rem 0.65rem;
    background: rgba(88, 166, 255, 0.08);
    color: var(--text-muted);
    border-radius: 100px;
    border: 1px solid rgba(88, 166, 255, 0.1);
    letter-spacing: 0.02em;
}

/* ============================================================
   9. ENGAGE / CTA
   ============================================================ */
.engage {
    padding: var(--space-3xl) var(--space-lg);
    background: var(--bg-primary);
    position: relative;
    overflow: hidden;
}

.engage::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(88, 166, 255, 0.03), rgba(57, 208, 216, 0.03));
    pointer-events: none;
}

.engage__inner {
    max-width: var(--max-width);
    margin: 0 auto;
    text-align: center;
    position: relative;
    z-index: 1;
}

.engage__title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    color: var(--text-bright);
    letter-spacing: -0.03em;
    margin-bottom: var(--space-sm);
}

.engage__subtitle {
    font-size: 1.05rem;
    color: var(--text-muted);
    margin-bottom: var(--space-2xl);
}

.engage__cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
    text-align: left;
}

.engage__card {
    padding: var(--space-lg);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    border: var(--border-subtle);
    transition: all var(--duration-med) var(--ease-out);
    display: flex;
    flex-direction: column;
}

.engage__card:hover {
    border-color: rgba(88, 166, 255, 0.15);
    transform: translateY(-4px);
}

.engage__card-icon {
    color: var(--accent-blue);
    margin-bottom: var(--space-sm);
}

.engage__card-title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--text-bright);
    margin-bottom: var(--space-xs);
}

.engage__card-desc {
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.55;
    margin-bottom: var(--space-md);
    flex: 1;
}

.engage__card .btn {
    align-self: center;
}

/* ============================================================
   11. FOOTER
   ============================================================ */
.footer {
    padding: var(--space-xl) var(--space-lg);
    background: var(--bg-secondary);
    border-top: var(--border-subtle);
}

.footer__inner {
    max-width: var(--max-width);
    margin: 0 auto;
}

.footer__top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-lg);
    border-bottom: var(--border-subtle);
}

.footer__name {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--text-bright);
}

.footer__links {
    display: flex;
    gap: var(--space-md);
}

.footer__link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-muted);
    transition: color var(--duration-fast);
}

.footer__link:hover {
    color: var(--accent-blue);
}

.footer__bottom {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--space-lg);
}

.footer__disclaimer {
    font-size: 0.75rem;
    color: var(--text-faint);
    line-height: 1.5;
    max-width: 600px;
}

.footer__copyright {
    font-size: 0.75rem;
    color: var(--text-faint);
    white-space: nowrap;
}

/* ============================================================
   SCROLL-TRIGGERED REVEAL (used by JS)
   ============================================================ */
.reveal {
    opacity: 0;
    transform: translateY(30px);
}

.reveal--visible {
    opacity: 1;
    transform: translateY(0);
    transition: opacity var(--duration-slow) var(--ease-out),
                transform var(--duration-slow) var(--ease-out);
}

/* ============================================================
   RESPONSIVE — TABLET
   ============================================================ */
@media (max-width: 1024px) {
    .hero {
        flex-direction: column;
        text-align: center;
        gap: var(--space-lg);
        padding-top: 6rem;
    }

    .hero__content {
        max-width: 100%;
    }

    .hero__tagline {
        max-width: 100%;
    }

    .hero__institutions {
        justify-content: center;
    }

    .hero__ctas {
        justify-content: center;
    }

    .hero__photo-frame {
        width: 280px;
        height: 340px;
    }

    .hero__scroll-indicator {
        display: none;
    }

    .about__pillars {
        grid-template-columns: repeat(2, 1fr);
    }

    .metrics__grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .press__grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .expertise__grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

/* ============================================================
   RESPONSIVE — MOBILE
   ============================================================ */
@media (max-width: 768px) {
    :root {
        --space-3xl: 4rem;
        --space-2xl: 3rem;
    }

    .nav__links {
        display: none;
    }

    .nav__hamburger {
        display: flex;
    }

    .hero__name {
        font-size: clamp(2.5rem, 12vw, 3.5rem);
    }

    .hero__photo-frame {
        width: 220px;
        height: 280px;
    }

    .hero__photo-accent {
        display: none;
    }

    .hero__institutions {
        flex-direction: column;
        gap: 0.25rem;
    }

    .hero__inst-sep {
        display: none;
    }

    .trust-bar__inner {
        flex-direction: column;
        gap: var(--space-sm);
    }

    .trust-bar__logos {
        flex-direction: column;
        gap: var(--space-sm);
        align-items: center;
    }

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

    /* Career: stacked layout, no pin */
    .career__signal-line {
        left: 14px;
    }

    .career__chapter {
        padding-left: 44px;
    }

    .career__node-dot {
        left: 9px;
    }

    .career__node-year {
        font-size: 0.75rem;
    }

    .career__content {
        margin-left: 0;
        padding: var(--space-md);
    }

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

    .metrics__grid {
        grid-template-columns: 1fr 1fr;
        gap: var(--space-sm);
    }

    .metrics__item {
        padding: var(--space-md);
    }

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

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

    .footer__top,
    .footer__bottom {
        flex-direction: column;
        gap: var(--space-sm);
    }
}

/* ============================================================
   REDUCED MOTION
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    .hero__label,
    .hero__name,
    .hero__tagline,
    .hero__institutions,
    .hero__ctas,
    .hero__photo,
    .hero__scroll-indicator,
    .reveal {
        opacity: 1 !important;
        transform: none !important;
    }

    html {
        scroll-behavior: auto;
    }
}