/* ========================================
   Design Tokens
   ======================================== */

:root {
    --color-primary: #1a365d;
    --color-primary-light: #2c5282;
    --color-primary-dark: #132a4a;
    --color-accent: #c9a84c;
    --color-accent-light: #d4b965;
    --color-bg: #ffffff;
    --color-bg-alt: #f7f8fa;
    --color-text: #2d3748;
    --color-text-light: #718096;
    --color-text-on-dark: #f7fafc;
    --color-border: #e2e8f0;

    --font-heading: 'Georgia', 'Times New Roman', serif;
    --font-body: 'Segoe UI', system-ui, -apple-system, sans-serif;
    --font-size-hero: clamp(2rem, 5vw, 3.5rem);

    --max-width: 1200px;
    --max-width-narrow: 800px;
    --border-radius: 8px;
    --border-radius-lg: 12px;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
    --transition: 200ms ease;
}

/* ========================================
   Reset & Base
   ======================================== */

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.7;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
}

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

a {
    color: var(--color-primary-light);
    text-decoration: none;
    transition: color var(--transition);
}

a:hover {
    color: var(--color-accent);
}

ul, ol {
    list-style: none;
}

/* ========================================
   Typography
   ======================================== */

h1, h2, h3, h4 {
    font-family: var(--font-heading);
    color: var(--color-primary);
    line-height: 1.3;
}

h1 { font-size: var(--font-size-hero); }
h2 { font-size: clamp(1.5rem, 3vw, 2rem); }
h3 { font-size: clamp(1.125rem, 2vw, 1.5rem); }

/* ========================================
   Layout
   ======================================== */

.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.25rem;
}

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

.section {
    padding: clamp(3rem, 8vw, 6rem) 0;
}

.section--alt {
    background-color: var(--color-bg-alt);
}

.section--dark {
    background-color: var(--color-primary);
    color: var(--color-text-on-dark);
}

.section--dark h2,
.section--dark h3 {
    color: var(--color-text-on-dark);
}

/* ========================================
   Skip Link (Accessibility)
   ======================================== */

.skip-link {
    position: absolute;
    top: -100%;
    left: 1rem;
    background: var(--color-accent);
    color: var(--color-primary-dark);
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    z-index: 1000;
    font-weight: 600;
}

.skip-link:focus {
    top: 0.5rem;
}

/* ========================================
   Header & Navigation
   ======================================== */

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: var(--color-primary);
    z-index: 100;
    box-shadow: var(--shadow-md);
}

.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.site-logo {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    color: var(--color-text-on-dark);
    font-weight: 700;
    white-space: nowrap;
}

.site-logo:hover {
    color: var(--color-accent);
}

.nav-toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    z-index: 110;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--color-text-on-dark);
    transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

.site-nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: min(300px, 80vw);
    height: 100vh;
    background-color: var(--color-primary-dark);
    padding: 5rem 2rem 2rem;
    transition: right 0.3s ease;
    box-shadow: -4px 0 12px rgba(0, 0, 0, 0.3);
}

.site-nav.is-open {
    right: 0;
}

.site-nav ul {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.site-nav a {
    display: block;
    color: var(--color-text-on-dark);
    padding: 0.75rem 1rem;
    border-radius: var(--border-radius);
    font-size: 1.125rem;
    transition: background-color var(--transition);
}

.site-nav a:hover,
.site-nav a.active {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--color-accent);
}

.site-nav a.active {
    border-left: 3px solid var(--color-accent);
}

.nav-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 90;
}

.nav-overlay.is-visible {
    display: block;
}

/* ========================================
   Hero Section
   ======================================== */

.hero {
    padding: clamp(6rem, 15vw, 10rem) 0 clamp(3rem, 8vw, 6rem);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: var(--color-text-on-dark);
    text-align: center;
    margin-top: 64px;
}

.hero h1 {
    color: var(--color-text-on-dark);
    margin-bottom: 1rem;
    font-weight: 700;
}

.hero__subtitle {
    font-size: clamp(1rem, 2.5vw, 1.375rem);
    color: rgba(247, 250, 252, 0.85);
    max-width: 600px;
    margin: 0 auto;
    font-weight: 300;
}

.hero__photo {
    width: clamp(140px, 25vw, 200px);
    height: clamp(140px, 25vw, 200px);
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid var(--color-accent);
    margin: 0 auto 2rem;
    box-shadow: var(--shadow-lg);
}

/* Page hero (shorter, for inner pages) */

.page-hero {
    padding: clamp(5rem, 12vw, 7rem) 0 clamp(2rem, 5vw, 3rem);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: var(--color-text-on-dark);
    text-align: center;
    margin-top: 64px;
}

.page-hero h1 {
    color: var(--color-text-on-dark);
    margin-bottom: 0.5rem;
}

.page-hero__subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: rgba(247, 250, 252, 0.8);
    font-weight: 300;
}

/* ========================================
   Cards
   ======================================== */

.card-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

.card {
    background: var(--color-bg);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    padding: 2rem 1.5rem;
    transition: transform var(--transition), box-shadow var(--transition);
    border: 1px solid var(--color-border);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.card__icon {
    font-size: 2rem;
    margin-bottom: 1rem;
    display: block;
}

.card h3 {
    margin-bottom: 0.5rem;
    font-size: 1.125rem;
}

.card p {
    color: var(--color-text-light);
    font-size: 0.9375rem;
    line-height: 1.6;
}

/* Article cards */

.article-card {
    background: var(--color-bg);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: transform var(--transition), box-shadow var(--transition);
    border: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
}

.article-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.article-card__image {
    width: 100%;
    aspect-ratio: 16 / 9;
    object-fit: cover;
}

.article-card__body {
    padding: 1.5rem;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.article-card__title {
    font-family: var(--font-heading);
    font-size: 1.0625rem;
    color: var(--color-primary);
    margin-bottom: 1rem;
    line-height: 1.4;
    flex: 1;
}

.article-card__link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--color-accent);
    font-weight: 600;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.article-card__link:hover {
    color: var(--color-accent-light);
}

.article-card__link svg {
    width: 16px;
    height: 16px;
    transition: transform var(--transition);
}

.article-card__link:hover svg {
    transform: translateX(3px);
}

/* ========================================
   About Section (Home)
   ======================================== */

.about-text {
    font-size: clamp(1rem, 2vw, 1.125rem);
    max-width: 750px;
    margin: 0 auto;
    text-align: center;
    color: var(--color-text);
}

.about-text p {
    margin-bottom: 1.5rem;
}

.section-heading {
    text-align: center;
    margin-bottom: 3rem;
}

.section-heading h2 {
    margin-bottom: 0.5rem;
}

.section-heading p {
    color: var(--color-text-light);
    font-size: 1.0625rem;
}

.section-heading::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background-color: var(--color-accent);
    margin: 1rem auto 0;
    border-radius: 2px;
}

/* ========================================
   Timeline (Bio)
   ======================================== */

.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
    padding-left: 2rem;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(to bottom, var(--color-accent), var(--color-primary-light));
    border-radius: 2px;
}

.timeline__item {
    position: relative;
    padding-bottom: 2.5rem;
    padding-left: 1.5rem;
}

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

.timeline__item::before {
    content: '';
    position: absolute;
    left: -2rem;
    top: 0.35rem;
    width: 13px;
    height: 13px;
    background-color: var(--color-accent);
    border: 3px solid var(--color-bg);
    border-radius: 50%;
    box-shadow: 0 0 0 3px var(--color-accent);
    z-index: 1;
}

.timeline__year {
    display: inline-block;
    font-weight: 700;
    font-size: 0.8125rem;
    color: var(--color-accent);
    background-color: rgba(201, 168, 76, 0.1);
    padding: 0.2rem 0.75rem;
    border-radius: 100px;
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.timeline__title {
    font-family: var(--font-heading);
    font-size: 1.125rem;
    color: var(--color-primary);
    margin-bottom: 0.25rem;
}

.timeline__org {
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 0.5rem;
}

.timeline__desc {
    color: var(--color-text-light);
    font-size: 0.9375rem;
    line-height: 1.6;
}

/* ========================================
   Badges (Certifications)
   ======================================== */

.badges {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    justify-content: center;
}

.badge {
    display: inline-block;
    background-color: rgba(201, 168, 76, 0.12);
    color: var(--color-primary);
    font-weight: 600;
    font-size: 0.875rem;
    padding: 0.5rem 1.25rem;
    border-radius: 100px;
    border: 1px solid rgba(201, 168, 76, 0.3);
}

.affiliations {
    max-width: 700px;
    margin: 2rem auto 0;
    text-align: center;
}

.affiliations p {
    color: var(--color-text-light);
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

/* ========================================
   Contact Page
   ======================================== */

.contact-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3rem;
    max-width: 800px;
    margin: 0 auto;
}

.contact-info {
    text-align: center;
}

.contact-info p {
    font-size: 1.0625rem;
    color: var(--color-text-light);
    margin-bottom: 2rem;
    line-height: 1.8;
}

.contact-cta {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    background-color: var(--color-accent);
    color: var(--color-primary-dark);
    font-weight: 700;
    font-size: 1.125rem;
    padding: 1rem 2.5rem;
    border-radius: var(--border-radius);
    transition: background-color var(--transition), transform var(--transition);
    text-decoration: none;
}

.contact-cta:hover {
    background-color: var(--color-accent-light);
    color: var(--color-primary-dark);
    transform: translateY(-2px);
}

.contact-cta svg {
    width: 20px;
    height: 20px;
}

.contact-links {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

.contact-link {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--color-primary);
    font-weight: 600;
    font-size: 1.0625rem;
    padding: 0.75rem 1.5rem;
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius);
    transition: border-color var(--transition), color var(--transition);
}

.contact-link:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.contact-link svg {
    width: 24px;
    height: 24px;
}

/* ========================================
   CTA Section (Home)
   ======================================== */

.cta-section {
    text-align: center;
    padding: clamp(3rem, 8vw, 5rem) 0;
}

.cta-section h2 {
    color: var(--color-text-on-dark);
    margin-bottom: 1rem;
}


.cta-section p {
    color: rgba(247, 250, 252, 0.8);
    margin-bottom: 2rem;
    font-size: 1.0625rem;
}

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

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 2rem;
    border-radius: var(--border-radius);
    font-weight: 600;
    font-size: 1rem;
    transition: background-color var(--transition), transform var(--transition);
    text-decoration: none;
}

.btn--primary {
    background-color: var(--color-accent);
    color: var(--color-primary-dark);
}

.btn--primary:hover {
    background-color: var(--color-accent-light);
    color: var(--color-primary-dark);
    transform: translateY(-2px);
}

.btn--outline {
    border: 2px solid rgba(247, 250, 252, 0.4);
    color: var(--color-text-on-dark);
}

.btn--outline:hover {
    border-color: var(--color-text-on-dark);
    color: var(--color-text-on-dark);
    transform: translateY(-2px);
}

.btn svg {
    width: 18px;
    height: 18px;
}

/* ========================================
   Footer
   ======================================== */

.site-footer {
    background-color: var(--color-primary-dark);
    color: rgba(247, 250, 252, 0.6);
    padding: 1.5rem 0;
}

.site-footer .container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    text-align: center;
}

.site-footer p {
    font-size: 0.875rem;
}

.site-footer a {
    color: rgba(247, 250, 252, 0.8);
    transition: color var(--transition);
}

.site-footer a:hover {
    color: var(--color-accent);
}

.footer-social svg {
    width: 24px;
    height: 24px;
}

/* ========================================
   Responsive
   ======================================== */

@media (min-width: 600px) {
    .card-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 768px) {
    .contact-grid {
        grid-template-columns: 1fr 1fr;
        text-align: left;
    }

    .contact-info {
        text-align: left;
    }

    .contact-links {
        align-items: flex-start;
    }

    .site-footer .container {
        flex-direction: row;
        justify-content: space-between;
    }
}

@media (min-width: 1024px) {
    .nav-toggle {
        display: none;
    }

    .site-nav {
        position: static;
        width: auto;
        height: auto;
        background-color: transparent;
        padding: 0;
        box-shadow: none;
    }

    .site-nav ul {
        flex-direction: row;
        gap: 0.25rem;
    }

    .site-nav a {
        font-size: 0.9375rem;
        padding: 0.5rem 1rem;
    }

    .site-nav a.active {
        border-left: none;
        border-bottom: 2px solid var(--color-accent);
        background-color: transparent;
    }

    .nav-overlay {
        display: none !important;
    }

    .card-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .timeline {
        padding-left: 3rem;
    }

    .timeline__item {
        padding-left: 2rem;
    }
}

/* ========================================
   Print
   ======================================== */

@media print {
    .site-header,
    .site-footer,
    .nav-toggle,
    .nav-overlay,
    .cta-section {
        display: none;
    }

    .hero,
    .page-hero {
        margin-top: 0;
        background: none;
        color: var(--color-text);
        padding: 1rem 0;
    }

    .hero h1,
    .page-hero h1 {
        color: var(--color-text);
    }

    body {
        font-size: 12pt;
        line-height: 1.5;
    }

    a {
        color: var(--color-text);
    }

    .card,
    .article-card {
        box-shadow: none;
        border: 1px solid #ccc;
        break-inside: avoid;
    }
}