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

:root {
    --color-bg: #fafafa;
    --color-surface: #ffffff;
    --color-text: #2d2d2d;
    --color-text-secondary: #555;
    --color-accent: #1a5276;
    --color-accent-light: #2980b9;
    --color-accent-bg: #eaf2f8;
    --color-border: #dde4ea;
    --color-header-bg: #1a5276;
    --color-header-text: #ffffff;
    --font-body: 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    --font-heading: 'Georgia', 'Times New Roman', serif;
    --max-width: 960px;
    --nav-height: 60px;
}

html {
    font-size: 17px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.7;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a {
    color: var(--color-accent-light);
    text-decoration: none;
    transition: color 0.2s;
}
a:hover {
    color: var(--color-accent);
    text-decoration: underline;
}

/* ===== Container ===== */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* ===== Navigation ===== */
.navbar {
    background: var(--color-header-bg);
    height: var(--nav-height);
    display: flex;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-name a {
    color: var(--color-header-text);
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 700;
    text-decoration: none;
}
.nav-name a:hover {
    text-decoration: none;
    opacity: 0.9;
}

.nav-menu {
    list-style: none;
    display: flex;
    gap: 0.25rem;
}
.nav-menu a {
    color: rgba(255,255,255,0.85);
    padding: 0.4rem 0.9rem;
    border-radius: 4px;
    font-size: 0.9rem;
    text-decoration: none;
    transition: background 0.2s, color 0.2s;
}
.nav-menu a:hover,
.nav-menu a.active {
    background: rgba(255,255,255,0.15);
    color: #fff;
    text-decoration: none;
}

/* Dropdown */
.dropdown {
    position: relative;
}
.dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    right: 0;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.12);
    min-width: 240px;
    padding: 0.5rem 0;
    list-style: none;
    z-index: 200;
}
.dropdown:hover .dropdown-menu {
    display: block;
}
.dropdown-menu a {
    color: var(--color-text);
    display: block;
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
    border-radius: 0;
}
.dropdown-menu a:hover {
    background: var(--color-accent-bg);
    color: var(--color-accent);
    text-decoration: none;
}

/* ===== Page Header ===== */
.page-header {
    background: linear-gradient(135deg, var(--color-header-bg), #1a6e9e);
    color: var(--color-header-text);
    padding: 3rem 0 2.5rem;
}
.page-header h1 {
    font-family: var(--font-heading);
    font-size: 2.2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}
.page-header .subtitle {
    font-size: 1.05rem;
    opacity: 0.9;
    max-width: 700px;
    line-height: 1.6;
}

/* ===== About Me ===== */
.about-me {
    overflow: hidden;
}
.headshot {
    float: left;
    width: 180px;
    height: auto;
    border-radius: 8px;
    margin: 0.25rem 1.5rem 1rem 0;
    box-shadow: 0 2px 8px rgba(0,0,0,0.12);
}
@media (max-width: 768px) {
    .headshot {
        float: none;
        display: block;
        margin: 0 auto 1rem;
        width: 150px;
    }
}

/* ===== Accordion (Sub-specialties) ===== */
.accordion {
    margin: 1rem 0 1.5rem;
}
.accordion details {
    border: 1px solid var(--color-border);
    border-radius: 6px;
    margin-bottom: 0.5rem;
    background: var(--color-surface);
}
.accordion summary {
    padding: 0.75rem 1rem;
    font-weight: 600;
    color: var(--color-accent);
    cursor: pointer;
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.accordion summary::-webkit-details-marker {
    display: none;
}
.accordion summary::after {
    content: '▸';
    font-size: 0.9rem;
    transition: transform 0.2s;
    margin-left: 0.75rem;
    flex-shrink: 0;
}
.accordion details[open] > summary::after {
    transform: rotate(90deg);
}
.accordion details[open] > summary {
    border-bottom: 1px solid var(--color-border);
}
.accordion details p {
    padding: 0.75rem 1rem;
    margin: 0;
}

/* ===== Hero (Home) ===== */
.hero {
    background: linear-gradient(135deg, var(--color-header-bg), #1a6e9e);
    color: var(--color-header-text);
    padding: 4rem 0 3.5rem;
}
.hero h1 {
    font-family: var(--font-heading);
    font-size: 2.4rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}
.hero .tagline {
    font-size: 1.1rem;
    opacity: 0.9;
    max-width: 700px;
    line-height: 1.6;
}

/* ===== Content ===== */
main {
    flex: 1;
}

.content {
    padding: 2.5rem 0 3rem;
}
.content h2 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    color: var(--color-accent);
    margin: 2rem 0 0.75rem;
    padding-bottom: 0.4rem;
    border-bottom: 2px solid var(--color-accent-bg);
}
.content h2:first-child {
    margin-top: 0;
}
.content h3 {
    font-size: 1.15rem;
    color: var(--color-accent);
    margin: 1.75rem 0 0.5rem;
}
.content p {
    margin-bottom: 1rem;
    color: var(--color-text-secondary);
}
.content p:last-child {
    margin-bottom: 0;
}

/* Lists */
.content ul, .content ol {
    margin: 0.75rem 0 1.25rem 1.5rem;
    color: var(--color-text-secondary);
}
.content li {
    margin-bottom: 0.6rem;
    line-height: 1.6;
}

/* Specialty cards (home page) */
.specialties-grid {
    display: grid;
    gap: 1.25rem;
    margin: 1.5rem 0;
}
.specialty-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: 1.25rem 1.5rem;
    transition: box-shadow 0.2s, border-color 0.2s;
}
.specialty-card:hover {
    box-shadow: 0 4px 16px rgba(0,0,0,0.08);
    border-color: var(--color-accent-light);
}
.specialty-card h3 {
    margin: 0 0 0.5rem;
    border: none;
    padding: 0;
}
.specialty-card p {
    font-size: 0.95rem;
    margin: 0;
}

/* Initiatives list (flood risk page) */
.initiatives-list {
    list-style: none;
    margin-left: 0;
    padding: 0;
}
.initiatives-list li {
    margin-bottom: 0.5rem;
}
.initiatives-list a {
    display: inline-block;
    padding: 0.4rem 0;
    font-weight: 500;
}
.initiatives-list a::before {
    content: '→ ';
    color: var(--color-accent-light);
}

/* Breadcrumb */
.breadcrumb {
    font-size: 0.9rem;
    margin-bottom: 1.5rem !important;
}

/* Ordered list (problems) */
.problems-list li {
    margin-bottom: 1rem;
}

/* References */
.references-list {
    font-size: 0.9rem;
    line-height: 1.5;
}
.references-list li {
    margin-bottom: 0.75rem;
}

/* PDF embed */
.pdf-container {
    border: 1px solid var(--color-border);
    border-radius: 8px;
    overflow: hidden;
}

/* Projects list */
.projects-list {
    list-style: none;
    margin-left: 0;
    padding: 0;
}
.projects-list li {
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--color-border);
}
.projects-list li:last-child {
    border-bottom: none;
}

/* Fun collaborations */
.collab-list li {
    margin-bottom: 1rem;
}

/* Contact */
.contact-section {
    background: var(--color-accent-bg);
    border-radius: 8px;
    padding: 2rem;
    margin-top: 2rem;
    text-align: center;
}
.contact-section p {
    color: var(--color-text);
}
.contact-email {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--color-accent) !important;
}

/* ===== Footer ===== */
footer {
    background: var(--color-header-bg);
    color: rgba(255,255,255,0.7);
    padding: 1.25rem 0;
    text-align: center;
    font-size: 0.85rem;
    margin-top: auto;
}
footer a {
    color: rgba(255,255,255,0.85);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    html { font-size: 16px; }
    .nav-container { flex-direction: column; gap: 0.5rem; padding: 0.75rem 1rem; }
    .navbar { height: auto; padding: 0.5rem 0; }
    .nav-menu { flex-wrap: wrap; justify-content: center; }
    .hero { padding: 2.5rem 0 2rem; }
    .hero h1 { font-size: 1.8rem; }
    .page-header h1 { font-size: 1.6rem; }
    .dropdown-menu { position: static; box-shadow: none; border: none; background: transparent; padding: 0; }
    .dropdown-menu a { color: rgba(255,255,255,0.85); padding: 0.3rem 0.9rem; }
    .dropdown-menu a:hover { background: rgba(255,255,255,0.15); color: #fff; }
}