:root {
    --color-white: rgba(255, 255, 255, 1);
    --color-cream-50: rgba(252, 252, 249, 1);
    --color-cream-100: rgba(255, 255, 253, 1);
    --color-gray-200: rgba(245, 245, 245, 1);
    --color-gray-300: rgba(167, 169, 169, 1);
    --color-slate-500: rgba(98, 108, 113, 1);
    --color-teal-500: rgba(33, 128, 141, 1);
    --color-teal-600: rgba(29, 116, 128, 1);
    --color-teal-700: rgba(26, 104, 115, 1);
    --color-slate-900: rgba(19, 52, 59, 1);
    --space-4: 4px;
    --space-8: 8px;
    --space-12: 12px;
    --space-16: 16px;
    --space-20: 20px;
    --space-24: 24px;
    --space-32: 32px;
    --radius-base: 8px;
    --radius-lg: 12px;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.02);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.04), 0 2px 4px -1px rgba(0, 0, 0, 0.02);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, var(--color-cream-50) 0%, var(--color-cream-100) 100%);
    color: var(--color-slate-900);
    line-height: 1.6;
}

/* Header Navigation */
header {
    background: var(--color-white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-16) var(--space-20);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 20px;
    font-weight: 600;
    color: var(--color-teal-600);
}

nav a {
    margin-left: var(--space-24);
    color: var(--color-slate-900);
    text-decoration: none;
    font-size: 16px;
    transition: color 0.3s ease;
}

nav a:hover {
    color: var(--color-teal-600);
}

/* Hero Section */
.hero {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-32) var(--space-20);
    text-align: center;
}

.hero h1 {
    font-size: 48px;
    margin-bottom: var(--space-12);
    color: var(--color-slate-900);
    font-weight: 700;
}

.hero-subtitle {
    font-size: 20px;
    color: var(--color-teal-600);
    margin-bottom: var(--space-8);
}

.hero-desc {
    font-size: 16px;
    color: var(--color-slate-500);
    max-width: 700px;
    margin: 0 auto var(--space-32);
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: var(--space-16);
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    padding: var(--space-12) var(--space-24);
    border-radius: var(--radius-base);
    border: none;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
}

.btn-primary {
    background: var(--color-teal-600);
    color: var(--color-white);
}

.btn-primary:hover {
    background: var(--color-teal-700);
}

.btn-secondary {
    background: var(--color-gray-200);
    color: var(--color-slate-900);
}

.btn-secondary:hover {
    background: var(--color-gray-300);
}

/* Sections */
section {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-32) var(--space-20);
}

section h2 {
    font-size: 32px;
    margin-bottom: var(--space-24);
    color: var(--color-slate-900);
    text-align: center;
    border-bottom: 2px solid var(--color-teal-500);
    padding-bottom: var(--space-16);
}

/* About Section */
.about-content {
    display: grid;
    grid-template-columns: 1.2fr 1fr;  /* esquerda um pouco maior */
    gap: 32px;
    align-items: start;
}

.about-right {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
}

.about-text p {
    margin-bottom: 16px;
    color: var(--color-slate-500);
    line-height: 1.8;
    font-size: 22px;
    text-align: justify;
}

.profile-photo-container {
    display: flex;
    justify-content: center;
}

.profile-photo {
    width: 260px;
    max-width: 100%;
    aspect-ratio: 1 / 1;
    object-fit: cover;
    border-radius: 50%;
    border: 4px solid var(--color-teal-500);
    box-shadow: var(--shadow-md);
}

/* Stats */
.stats {
    width: 100%;
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
}

.stat-item {
    background: var(--color-white);
    padding: var(--space-20);
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-sm);
}

.stat-number {
    font-size: 28px;
    font-weight: 700;
    color: var(--color-teal-600);
}

.stat-label {
    font-size: 12px;
    color: var(--color-slate-500);
    margin-top: var(--space-8);
    text-transform: uppercase;
}

/* Research Section */
.research-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-24);
}

.research-card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    padding: var(--space-24);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    border-left: 4px solid var(--color-teal-500);
}

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

.research-card h3 {
    color: var(--color-teal-600);
    margin-bottom: var(--space-12);
    font-size: 18px;
}

.research-card p {
    color: var(--color-slate-500);
    font-size: 14px;
    line-height: 1.7;
    text-align: justify;
}

.tag {
    display: inline-block;
    background: var(--color-gray-200);
    color: var(--color-slate-900);
    padding: var(--space-4) var(--space-12);
    border-radius: 20px;
    font-size: 12px;
    margin-top: var(--space-12);
    margin-right: var(--space-8);
}

/* Skills Section */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-24);
}

.skill-category {
    background: var(--color-white);
    padding: var(--space-20);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.skill-category h3 {
    color: var(--color-teal-600);
    margin-bottom: var(--space-16);
    font-size: 16px;
}

.skill-list {
    list-style: none;
}

.skill-list li {
    padding: var(--space-8) 0;
    color: var(--color-slate-500);
    font-size: 16px;
    display: flex;
    align-items: center;
}

.skill-list li:before {
    content: "✓";
    color: var(--color-teal-600);
    font-weight: bold;
    margin-right: var(--space-12);
}

/* Education & Funding */
.timeline {
    position: relative;
    padding-left: var(--space-32);
}

.timeline-item {
    margin-bottom: var(--space-24);
    background: var(--color-white);
    padding: var(--space-20);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border-left: 3px solid var(--color-teal-500);
}

.timeline-item h3 {
    color: var(--color-teal-600);
    margin-bottom: var(--space-4);
}

.timeline-item .date {
    color: var(--color-slate-500);
    font-size: 12px;
    font-weight: 500;
}

.timeline-item p {
    color: var(--color-slate-500);
    font-size: 16px;
    margin-top: var(--space-8);
    text-align: justify;
}

/* Contact */
.contact-box {
    background: var(--color-white);
    padding: var(--space-32);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.contact-text {
    color: var(--color-slate-500);
    margin-bottom: var(--space-24);
    font-size: 16px;
    text-align: justify;
}

.contact-buttons {
    display: flex;
    gap: var(--space-16);
    justify-content: center;
    flex-wrap: wrap;
}

.contact-location {
    color: var(--color-slate-500);
    margin-top: var(--space-24);
    font-size: 16px;
}

/* Footer */
footer {
    background: var(--color-slate-900);
    color: var(--color-white);
    text-align: center;
    padding: var(--space-32) var(--space-20);
    margin-top: var(--space-32);
}

.footer-subtext {
    font-size: 12px;
    margin-top: var(--space-12);
    opacity: 0.7;
}

.social-links {
    margin-top: var(--space-16);
    display: flex;
    justify-content: center;
    gap: var(--space-16);
}

.social-links a {
    color: var(--color-white);
    text-decoration: none;
    font-size: 16px;
    transition: color 0.3s ease;
}

.social-links a:hover {
    color: var(--color-teal-500);
}

/* Responsivo */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 32px;
    }

    .about-content {
        grid-template-columns: 1fr;
    }


    /* No mobile, foto ao lado dos textos (em cima) */
    .about-text {
        display: grid;
        grid-template-columns: 1fr;
        align-items: start;
        text-align: justify;
    }

    .profile-photo-container {
        margin-bottom: 0;
        justify-content: flex-start;
    }

    .profile-photo {
        width: 180px;
    }

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

    nav {
        flex-direction: column;
        gap: var(--space-16);
    }

    nav a {
        margin-left: 0;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }
}