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

:root {
    --navy: #1a2744;
    --navy-light: #2a3d5e;
    --accent: #3b5998;
    --text: #2c3e50;
    --text-light: #5a6a7a;
    --bg: #ffffff;
    --bg-alt: #f7f9fc;
    --border: #e2e8f0;
    --radius: 8px;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 72px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

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

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

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== Navbar ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border);
    z-index: 1000;
    transition: box-shadow 0.3s;
}

.navbar.scrolled {
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
}

.nav-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.nav-logo {
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--navy);
    letter-spacing: -0.5px;
}

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

.nav-links {
    list-style: none;
    display: flex;
    gap: 32px;
}

.nav-links a {
    color: var(--text-light);
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.2s;
}

.nav-links a:hover {
    color: var(--navy);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--navy);
    border-radius: 2px;
    transition: transform 0.3s, opacity 0.3s;
}

.nav-toggle.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ===== Hero ===== */
.hero {
    padding: 140px 0 80px;
    text-align: center;
    background: linear-gradient(180deg, var(--bg-alt) 0%, var(--bg) 100%);
}

.hero-photo {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    object-fit: cover;
    object-position: center top;
    border: 4px solid #fff;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    margin-bottom: 20px;
}

.hero-name {
    font-size: 2.75rem;
    font-weight: 700;
    color: var(--navy);
    letter-spacing: -1px;
    margin-bottom: 8px;
}

.hero-title {
    font-size: 1.2rem;
    color: var(--text-light);
    font-weight: 400;
    margin-bottom: 4px;
}

.hero-location {
    font-size: 0.95rem;
    color: var(--text-light);
    margin-bottom: 24px;
}

.hero-links {
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
}

.hero-link {
    display: inline-block;
    padding: 10px 24px;
    border: 1.5px solid var(--navy);
    border-radius: var(--radius);
    color: var(--navy);
    font-weight: 500;
    font-size: 0.9rem;
    transition: background 0.2s, color 0.2s;
}

.hero-link:hover {
    background: var(--navy);
    color: #fff;
}

/* ===== Sections ===== */
.section {
    padding: 72px 0;
}

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

.section-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--navy);
    margin-bottom: 32px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--border);
}

.section-title-light {
    color: #fff;
    border-bottom-color: rgba(255, 255, 255, 0.2);
}

/* ===== Summary ===== */
.summary-text {
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--text);
}

/* ===== Entries (Experience & Education) ===== */
.entry {
    margin-bottom: 40px;
}

.entry:last-child {
    margin-bottom: 0;
}

.entry-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 16px;
    margin-bottom: 8px;
}

.entry-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--navy);
}

.entry-subtitle {
    font-size: 0.95rem;
    color: var(--text-light);
    margin-top: 2px;
}

.entry-date {
    font-size: 0.85rem;
    color: var(--text-light);
    white-space: nowrap;
    padding-top: 3px;
}

.entry-context {
    font-size: 0.92rem;
    color: var(--text-light);
    font-style: italic;
    margin-bottom: 12px;
}

.entry-bullets {
    list-style: none;
    padding: 0;
}

.entry-bullets li {
    position: relative;
    padding-left: 20px;
    margin-bottom: 8px;
    font-size: 0.95rem;
    line-height: 1.7;
}

.entry-bullets li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 10px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent);
}

/* ===== Publication ===== */
.publication {
    margin-top: 12px;
    padding: 16px;
    background: var(--bg-alt);
    border-radius: var(--radius);
    border-left: 3px solid var(--accent);
}

.publication-label {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--accent);
    margin-bottom: 4px;
}

.publication-title {
    font-size: 0.95rem;
    font-style: italic;
    margin-bottom: 8px;
}

.publication-links {
    display: flex;
    gap: 16px;
}

.publication-links a {
    font-size: 0.85rem;
    font-weight: 500;
}

/* ===== Skills ===== */
.skills-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 32px;
}

.skill-category h3 {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--navy);
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.skill-tag {
    display: inline-block;
    padding: 6px 14px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 20px;
    font-size: 0.85rem;
    color: var(--text);
    transition: border-color 0.2s, background 0.2s;
}

.skill-tag:hover {
    border-color: var(--accent);
    background: rgba(59, 89, 152, 0.05);
}

/* ===== Footer ===== */
.footer {
    background: var(--navy);
    color: #fff;
    padding: 64px 0 32px;
    text-align: center;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 24px;
    flex-wrap: wrap;
    margin-bottom: 32px;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.95rem;
    transition: color 0.2s;
}

.footer-links a:hover {
    color: #fff;
}

.footer-copy {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.4);
}

/* ===== Fade-in Animation ===== */
.fade-in {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }

    .nav-links {
        position: fixed;
        top: 64px;
        left: 0;
        right: 0;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(8px);
        flex-direction: column;
        align-items: center;
        gap: 0;
        padding: 0;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease, padding 0.3s ease;
        border-bottom: 1px solid var(--border);
    }

    .nav-links.open {
        max-height: 300px;
        padding: 16px 0;
    }

    .nav-links li {
        width: 100%;
        text-align: center;
    }

    .nav-links a {
        display: block;
        padding: 12px 24px;
        font-size: 1rem;
    }

    .hero {
        padding: 120px 0 60px;
    }

    .hero-name {
        font-size: 2rem;
    }

    .hero-title {
        font-size: 1.05rem;
    }

    .entry-header {
        flex-direction: column;
        gap: 4px;
    }

    .entry-date {
        font-size: 0.85rem;
    }

    .skills-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .section {
        padding: 48px 0;
    }
}

@media (max-width: 480px) {
    .hero-name {
        font-size: 1.75rem;
    }

    .hero-links {
        flex-direction: column;
        align-items: center;
    }

    .hero-link {
        width: 100%;
        max-width: 200px;
        text-align: center;
    }

    .footer-links {
        flex-direction: column;
        align-items: center;
    }
}