/* Importação de fontes otimizada */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Poppins:wght@300;400;500;600;700&display=swap');

/* Variáveis globais para consistência */
:root {
    --primary-color: #6d28d9; /* Roxo sofisticado */
    --secondary-color: #a855f7; /* Roxo claro */
    --accent-color: #14b8a6; /* Teal moderno */
    --accent-secondary: #2dd4bf; /* Teal claro */
    --dark-color: #1e1b4b; /* Azul escuro */
    --light-color: #f9fafb; /* Branco suave */
    --success-color: #16a34a; /* Verde */
    --text-color: #1f2937; /* Cinza escuro */
    --text-light: #ffffff; /* Branco puro */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-hover: 0 8px 20px rgba(0, 0, 0, 0.12);
    --shadow-3d: 0 10px 30px rgba(0, 0, 0, 0.15);
    --border-radius: 12px;
    --glow: 0 0 12px rgba(109, 40, 217, 0.3);
    --gradient: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    --gradient-overlay: linear-gradient(135deg, rgba(109, 40, 217, 0.1), rgba(20, 184, 166, 0.1));
    
    /* Tema escuro */
    --dark-bg: #111827;
    --dark-text: #d1d5db;
    --dark-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}

/* Suporte a tema escuro */
@media (prefers-color-scheme: dark) {
    :root {
        --light-color: var(--dark-bg);
        --text-color: var(--dark-text);
        --shadow: var(--dark-shadow);
    }
    body { background: var(--dark-bg); }
}

/* Reset global */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', 'Poppins', sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

html {
    scroll-behavior: smooth;
    font-size: clamp(14px, 2.5vw, 16px);
}

body {
    background: var(--light-color);
    color: var(--text-color);
    line-height: 1.7;
    min-height: 100vh;
    position: relative;
    overflow-x: hidden;
}

/* Animações otimizadas */
@keyframes gradient {
    0% {clients: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

/* Partículas de fundo */
.particles {
    position: fixed;
    inset: 0;
    z-index: -1;
    pointer-events: none;
}

.particle {
    position: absolute;
    width: 5px;
    height: 5px;
    background: radial-gradient(circle, rgba(109, 40, 217, 0.15), transparent);
    border-radius: 50%;
    animation: float 12s infinite ease-in-out;
    will-change: transform;
}

/* Header responsivo */
.header {
    background: rgba(17, 24, 39, 0.95);
    backdrop-filter: blur(14px);
    position: sticky;
    top: 0;
    width: 100%;
    z-index: 1000;
    padding: clamp(0.75rem, 2vw, 1rem) clamp(4%, 5vw, 6%);
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.header:hover { box-shadow: var(--shadow-hover); }

/* Logo responsivo */
.logo-container { display: flex; align-items: center; }

.logo {
    height: clamp(36px, 8vw, 48px);
    width: auto;
    transition: var(--transition);
    filter: drop-shadow(0 2px 6px rgba(109, 40, 217, 0.2));
}

.logo:hover {
    transform: scale(1.08);
    filter: drop-shadow(0 4px 10px rgba(109, 40, 217, 0.4));
}

/* Navegação responsiva */
.nav-list {
    display: flex;
    list-style: none;
    gap: clamp(1.5rem, 3vw, 2.5rem);
}

.nav-list li a {
    color: var(--text-light);
    text-decoration: none;
    font-weight: 500;
    font-size: clamp(0.9rem, 2vw, 1rem);
    position: relative;
    padding: 0.5rem 0;
    transition: var(--transition);
}

.nav-list li a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient);
    transition: var(--transition);
}

.nav-list li a:hover {
    color: var(--accent-color);
    text-shadow: 0 1px 4px rgba(20, 184, 166, 0.2);
}

.nav-list li a:hover::after { width: 100%; }

/* Hamburger menu */
.hamburger {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    width: 32px;
    height: 32px;
    position: relative;
}

.hamburger span {
    display: block;
    width: 100%;
    height: 3px;
    background: var(--gradient);
    margin: 6px 0;
    transition: var(--transition);
    border-radius: 4px;
}

.hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(7px, 7px); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(7px, -7px); }

/* Hero Section responsiva */
.hero {
    background: var(--gradient);
    background-size: 300%;
    animation: gradient 12s ease infinite;
    color: var(--text-light);
    padding: clamp(60px, 15vw, 100px) clamp(4%, 5vw, 6%) clamp(40px, 10vw, 80px);
    text-align: center;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-3d);
    border-radius: 0 0 clamp(16px, 4vw, 32px) clamp(16px, 4vw, 32px);
}

.hero h2 {
    font-family: 'Poppins', sans-serif;
    font-size: clamp(1.75rem, 6vw, 3.25rem);
    font-weight: 700;
    margin-bottom: 1.5rem;
    text-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
}

.hero p {
    font-size: clamp(0.9rem, 2.5vw, 1.15rem);
    max-width: 700px;
    margin: 0 auto 2rem;
    opacity: 0.95;
    line-height: 1.8;
}

.hero button {
    background: var(--accent-color);
    color: var(--text-light);
    border: none;
    font-family: 'Poppins', sans-serif;
    font-size: clamp(0.9rem, 2vw, 1.1rem);
    font-weight: 600;
    padding: clamp(0.8rem, 2vw, 1rem) clamp(1.5rem, 4vw, 2.5rem);
    border-radius: var(--border-radius);
    transition: var(--transition);
    box-shadow: var(--shadow);
}

.hero button:hover {
    background: var(--accent-secondary);
    transform: translateY(-3px);
    box-shadow: var(--glow);
}

/* Seção de Cursos responsiva */
.courses {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(clamp(260px, 45vw, 300px), 1fr));
    gap: clamp(1.5rem, 3vw, 2rem);
    padding: clamp(2rem, 5vw, 4rem) clamp(4%, 5vw, 6%);
    max-width: 1400px;
    margin: 0 auto;
}

.course-card {
    background: var(--light-color);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
}

.course-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-hover);
}

.course-card img {
    width: 100%;
    height: clamp(160px, 30vw, 220px);
    object-fit: cover;
    transition: var(--transition);
}

.course-card:hover img {
    transform: scale(1.03);
    filter: brightness(1.05);
}

.course-card h3 {
    color: var(--primary-color);
    padding: clamp(1rem, 2vw, 1.5rem) clamp(1rem, 2vw, 1.5rem) clamp(0.5rem, 1vw, 0.75rem);
    font-family: 'Poppins', sans-serif;
    font-size: clamp(1.2rem, 3vw, 1.4rem);
    font-weight: 600;
}

.course-card p {
    padding: 0 clamp(1rem, 2vw, 1.5rem) clamp(1rem, 2vw, 1.5rem);
    color: var(--text-color);
    font-size: clamp(0.85rem, 2vw, 0.95rem);
    line-height: 1.6;
}

.course-card button {
    margin: 0 clamp(1rem, 2vw, 1.5rem) clamp(1rem, 2vw, 1.5rem);
    padding: clamp(0.7rem, 2vw, 0.9rem) clamp(1.5rem, 3vw, 2rem);
    background: var(--gradient);
    color: var(--text-light);
    border: none;
    border-radius: var(--border-radius);
    font-family: 'Poppins', sans-serif;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.course-card button:hover {
    box-shadow: var(--glow);
    transform: translateY(-2px);
}

/* Footer responsivo com links de políticas */
#footer-container {
    background: var(--dark-color);
    color: var(--text-light);
    padding: clamp(2rem, 5vw, 4rem) clamp(4%, 5vw, 6%);
    box-shadow: 0 -6px 12px rgba(0, 0, 0, 0.15);
    border-radius: clamp(16px, 4vw, 32px) clamp(16px, 4vw, 32px) 0 0;
    text-align: center;
    font-size: clamp(0.85rem, 2vw, 1rem);
}

.footer-links {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: clamp(1rem, 3vw, 2rem);
    margin-top: 1.5rem;
}

.footer-links a {
    color: var(--text-light);
    text-decoration: none;
    font-size: clamp(0.85rem, 2vw, 0.95rem);
    font-weight: 400;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    transition: var(--transition);
    position: relative;
}

.footer-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 1px;
    background: var(--accent-color);
    transition: var(--transition);
    transform: translateX(-50%);
}

.footer-links a:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--accent-color);
}

.footer-links a:hover::after {
    width: 50%;
}

.footer-links a:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(109, 40, 217, 0.3);
}

/* Botão de voltar ao topo */
.back-to-top {
    position: fixed;
    bottom: clamp(1.5rem, 4vw, 2rem);
    right: clamp(1.5rem, 4vw, 2rem);
    background: var(--gradient);
    color: var(--text-light);
    width: clamp(40px, 10vw, 48px);
    height: clamp(40px, 10vw, 48px);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow);
    opacity: 0;
    transition: var(--transition);
    pointer-events: none;
}

.back-to-top.visible {
    opacity: 1;
    pointer-events: auto;
}

.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: var(--glow);
}

/* Barra de rolagem */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--light-color);
    border-radius: 8px;
}

::-webkit-scrollbar-thumb {
    background: var(--gradient);
    border-radius: 8px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-color);
}

/* Acessibilidade */
button:focus, a:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(109, 40, 217, 0.3);
}

/* Media Queries para responsividade */
@media (max-width: 1200px) {
    .courses { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
    .hero { padding: clamp(50px, 12vw, 80px) 5% clamp(30px, 8vw, 60px); }
}

@media (max-width: 768px) {
    .hamburger { display: block; }
    .nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: clamp(250px, 80%, 320px);
        height: 100vh;
        background: rgba(17, 24, 39, 0.95);
        backdrop-filter: blur(12px);
        transition: var(--transition);
    }
    .nav.active { right: 0; }
    .nav-list {
        flex-direction: column;
        align-items: center;
        justify-content: center;
        height: 100%;
        gap: clamp(2rem, 5vw, 2.5rem);
    }
    .nav-list li a { font-size: clamp(1rem, 3vw, 1.2rem); }
    .hero h2 { font-size: clamp(1.5rem, 5vw, 2.5rem); }
    .hero p { font-size: clamp(0.85rem, 2.5vw, 1rem); }
    .courses { grid-template-columns: 1fr; }
    .footer-links { flex-direction: column; gap: 1rem; }
}

@media (max-width: 480px) {
    .header { padding: 0.75rem 4%; }
    .logo { height: clamp(32px, 10vw, 40px); }
    .hero { padding: clamp(40px, 10vw, 60px) 4% clamp(20px, 6vw, 40px); }
    .hero h2 { font-size: clamp(1.25rem, 4vw, 2rem); }
    .hero button { padding: 0.8rem 1.5rem; font-size: 0.95rem; }
    .course-card img { height: clamp(140px, 25vw, 180px); }
    .course-card h3 { font-size: clamp(1.1rem, 2.5vw, 1.3rem); }
    .course-card p { font-size: clamp(0.8rem, 2vw, 0.9rem); }
    .courses { padding: 2rem 4%; }
    .footer-links a { font-size: clamp(0.8rem, 2vw, 0.9rem); }
}

@media (max-width: 360px) {
    html { font-size: 14px; }
    .nav { width: 100%; }
    .hero { padding: 40px 4% 30px; }
    .course-card img { height: 160px; }
}