* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
}

:root {
    /* Light Mode (padrão) */
    --bg-color: #f5f5f5;
    --text-color: #333;
    --nav-bg: #fff;
    --nav-text: #555;
    --nav-hover: #007bff;
    --shadow: rgba(0, 0, 0, 0.05);
    --card-bg: #fff;
    --card-text: #777;
    --btn-bg: #007bff;
    --btn-hover: #0056b3;
    --input-border: #ddd;
    --focus-color: rgba(0, 123, 255, 0.2);
}

[data-theme="dark"] {
    /* Dark Mode */
    --bg-color: #1a1a1a;
    --text-color: #e0e0e0;
    --nav-bg: #2a2a2a;
    --nav-text: #ccc;
    --nav-hover: #00c4cc;
    --shadow: rgba(255, 255, 255, 0.05);
    --card-bg: #2a2a2a;
    --card-text: #bbb;
    --btn-bg: #00c4cc;
    --btn-hover: #009b9f;
    --input-border: #444;
    --focus-color: rgba(0, 196, 204, 0.2);
}

body {
    background: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background 0.3s, color 0.3s;
}

/* Navegação */
nav {
    position: fixed;
    top: 0;
    width: 100%;
    background: var(--nav-bg);
    padding: 1.5rem 2rem;
    box-shadow: 0 2px 10px var(--shadow);
    z-index: 100;
    animation: slideDown 0.5s ease-out;
}

nav ul {
    display: flex;
    justify-content: flex-end;
    list-style: none;
}

nav ul li {
    margin-left: 2.5rem;
}

nav ul li a {
    color: var(--nav-text);
    text-decoration: none;
    font-size: 1.1rem;
    font-weight: 500;
    position: relative;
    transition: color 0.3s;
}

nav ul li a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    background: var(--nav-hover);
    bottom: -5px;
    left: 0;
    transition: width 0.3s ease;
}

nav ul li a:hover::after {
    width: 100%;
}

nav ul li a:hover {
    color: var(--nav-hover);
}

/* Botão de Tema */
.theme-btn {
    background: var(--btn-bg);
    color: #fff;
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    font-size: 1.2rem;
    cursor: pointer;
    margin-left: 2rem; /* Espaço entre os links e o botão */
    transition: transform 0.3s, background 0.3s;
}

.theme-btn:hover {
    transform: scale(1.1);
    background: var(--btn-hover);
}

/* Seções */
section {
    padding: 6rem 2rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    opacity: 0;
    animation: fadeIn 0.8s ease forwards;
    animation-delay: 0.2s;
}

/* Hero */
.hero {
    text-align: center;
    position: relative;
}

.hero h1::before {
    content: '';
    position: absolute;
    width: 50px;
    height: 3px;
    background: linear-gradient(90deg, var(--btn-bg), var(--btn-hover));
    top: -20px;
    left: 50%;
    transform: translateX(-50%);
}

h1 {
    font-size: 3rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 1rem;
    animation: fadeInUp 0.6s ease forwards;
}

h2 {
    font-size: 2.2rem;
    font-weight: 500;
    color: var(--text-color);
    margin-bottom: 2rem;
    position: relative;
}

h2::after {
    content: '';
    position: absolute;
    width: 30px;
    height: 2px;
    background: var(--btn-bg);
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
}

/* Botão */
.btn {
    display: inline-block;
    padding: 0.8rem 2rem;
    background: var(--btn-bg);
    color: #fff;
    text-decoration: none;
    border-radius: 5px;
    margin-top: 1.5rem;
    font-weight: 500;
    position: relative;
    overflow: hidden;
    transition: transform 0.3s, box-shadow 0.3s, background 0.3s;
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px var(--focus-color);
    background: var(--btn-hover);
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.2);
    transition: left 0.4s;
}

.btn:hover::before {
    left: 100%;
}

/* Projetos */
.project-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    width: 100%;
}

.project-card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 4px 15px var(--shadow);
    transition: transform 0.3s, box-shadow 0.3s;
    opacity: 0;
    animation: fadeInUp 0.6s ease forwards;
    animation-delay: 0.4s;
}

.project-card:hover {
    transform: translateY(-8px) rotate(1deg);
    box-shadow: 0 10px 25px var(--shadow);
}

.project-card h3 {
    font-size: 1.5rem;
    color: var(--text-color);
    margin-bottom: 1rem;
}

.project-card p {
    font-size: 1rem;
    color: var(--card-text);
}

/* Sobre e Contato */
.sobre-content {
    text-align: center;
}

#contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
    max-width: 500px;
    width: 100%;
    opacity: 0;
    animation: fadeInUp 0.6s ease forwards;
    animation-delay: 0.6s;
}

#contact-form input,
#contact-form textarea {
    padding: 1rem;
    border: 1px solid var(--input-border);
    border-radius: 5px;
    background: var(--card-bg);
    color: var(--text-color);
    font-size: 1rem;
    transition: border-color 0.3s, box-shadow 0.3s;
}

#contact-form input:focus,
#contact-form textarea:focus {
    border-color: var(--btn-bg);
    box-shadow: 0 0 8px var(--focus-color);
    outline: none;
}

#contact-form textarea {
    min-height: 150px;
    resize: vertical;
}

/* Animações */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes slideDown {
    from { transform: translateY(-100%); }
    to { transform: translateY(0); }
}

/* Responsividade */
@media (max-width: 768px) {
    nav ul {
        justify-content: center;
    }

    nav ul li {
        margin: 0 1rem;
    }

    section {
        padding: 4rem 1rem;
    }

    h1 {
        font-size: 2.2rem;
    }

    h2 {
        font-size: 1.8rem;
    }

    .project-container {
        grid-template-columns: 1fr;
    }

    .theme-btn {
        top: 15px;
        right: 15px;
        width: 35px;
        height: 35px;
    }
}