:root {
    --bg-dark: #0a0a0a;
    --bg-light: #1a1a1a;
    --primary: #ffffff;
    --primary-dark: #cccccc;
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --card-bg: rgba(255, 255, 255, 0.05);
    --border-color: rgba(255, 255, 255, 0.1);
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    --spacing-4xl: 6rem;
    --font-family: "Urbanist", sans-serif;
    --radius-sm: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-full: 9999px;
    --shadow-primary: 0 4px 15px rgba(255, 255, 255, 0.2);
    --transition-normal: 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-primary);
    font-family: var(--font-family);
    line-height: 1.6;
    overflow-x: hidden;
    background-image: 
        linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
    background-size: 25px 25px;
}

a {
    text-decoration: none;
    color: inherit;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header Styles */
header {
    background: rgba(15, 15, 15, 0.9);
    padding: 1rem 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.4);
    transform: translateY(0);
    transition: transform 0.3s ease;
}

header.hidden {
    transform: translateY(-100%);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 28px;
    font-weight: 800;
    display: flex;
    align-items: center;
    color: var(--text-primary);
    transition: transform 0.3s ease;
}

.logo:hover {
    transform: scale(1.05);
}

.logo img {
    height: 40px;
    margin-right: 10px;
    filter: grayscale(100%) brightness(200%);
}

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

.nav-links li {
    margin-left: 30px;
}

.nav-links a {
    color: var(--text-primary);
    font-weight: 500;
    transition: 0.3s;
    font-size: 15px;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    position: relative;
    overflow: hidden;
}

.nav-links a.active {
    color: var(--primary);
    background-color: rgba(255, 255, 255, 0.1);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--primary);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform 0.3s ease;
}

.nav-links a:hover::after {
    transform: scaleX(1);
    transform-origin: left;
}

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

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    width: 30px;
    height: 21px;
    position: relative;
}

.hamburger span {
    width: 100%;
    height: 3px;
    background: var(--text-primary);
    margin: 3px 0;
    transition: 0.3s;
    transform-origin: center;
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

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

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* Hero Section */
.hero {
    padding: 180px 0 100px;
    text-align: center;
    background: radial-gradient(ellipse at center, rgba(255, 255, 255, 0.05) 0%, transparent 70%);
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 20% 50%, rgba(255, 255, 255, 0.03) 0%, transparent 50%),
                radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.03) 0%, transparent 50%);
    animation: float 20s ease-in-out infinite;
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0);
    }
    50% {
        transform: translate(-10px, -10px);
    }
}

.hero-content {
    max-width: 800px;
    z-index: 10;
}

.hero h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    margin-bottom: 20px;
    background: linear-gradient(135deg, #fff 0%, #aaa 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: fadeInUp 0.8s ease-out;
}

.hero h2 {
    font-size: 22px;
    color: var(--text-secondary);
    margin-bottom: 30px;
    font-weight: 400;
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

.hero p {
    color: var(--text-secondary);
    font-size: 18px;
    line-height: 1.6;
    margin-bottom: 40px;
    animation: fadeInUp 0.8s ease-out 0.4s both;
}

.cta-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 0.8s ease-out 0.6s both;
}

.btn {
    padding: 15px 30px;
    border-radius: var(--radius-full);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

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

.btn-primary {
    background-color: var(--primary);
    color: #000;
    box-shadow: var(--shadow-primary);
}

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(255, 255, 255, 0.3);
}

.btn-secondary {
    background-color: transparent;
    border: 2px solid rgba(255, 255, 255, 0.2);
    color: var(--text-primary);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.3);
    transform: translateY(-3px);
}

/* Apostilas Section */
.apostilas-section {
    padding: 100px 0;
    background: linear-gradient(180deg, var(--bg-dark) 0%, var(--bg-light) 100%);
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-tag {
    display: inline-block;
    background-color: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.3);
    color: var(--primary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-full);
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 20px;
    animation: fadeIn 0.8s ease-out;
}

.section-title {
    font-size: clamp(2rem, 4vw, 3.5rem);
    font-weight: 700;
    margin-bottom: 20px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: fadeIn 0.8s ease-out 0.2s both;
}

.section-description {
    color: var(--text-secondary);
    font-size: 18px;
    max-width: 600px;
    margin: 0 auto;
    animation: fadeIn 0.8s ease-out 0.4s both;
}

/* Nova Seção de Apostilas com Cards Especiais */
.categoria-apostilas {
    margin-bottom: 80px;
}

.categoria-title {
    font-size: 32px;
    margin-bottom: 40px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 15px;
    position: relative;
    padding-bottom: 15px;
}

.categoria-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), transparent);
    border-radius: var(--radius-full);
}

.series-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
    gap: 30px;
}

/* Card Principal da Série */
.serie-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    position: relative;
    overflow: hidden;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    backdrop-filter: blur(20px);
    transform: translateY(0);
}

.serie-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.03), transparent);
    transition: left 0.6s ease;
}

.serie-card:hover::before {
    left: 100%;
}

.serie-card:hover {
    transform: translateY(-12px) scale(1.02);
    border-color: rgba(255, 255, 255, 0.3);
    box-shadow: 
        0 25px 50px rgba(0, 0, 0, 0.5),
        0 0 0 1px rgba(255, 255, 255, 0.1),
        0 0 50px rgba(255, 255, 255, 0.1);
}

.card-glow {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--primary), transparent);
    opacity: 0;
    transition: opacity 0.4s ease;
}

.serie-card:hover .card-glow {
    opacity: 1;
    animation: glowMove 2s ease-in-out infinite;
}

@keyframes glowMove {
    0%, 100% {
        transform: translateX(-100%);
    }
    50% {
        transform: translateX(100%);
    }
}

.card-content {
    padding: 30px;
    position: relative;
    z-index: 2;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
    padding-bottom: 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.serie-title {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

.card-badge {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #000;
    padding: 6px 12px;
    border-radius: var(--radius-full);
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.card-body {
    position: relative;
}

/* Volume Item */
.volume-item {
    margin-bottom: 0;
}

.volume-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
    padding: 15px;
    background: rgba(255, 255, 255, 0.03);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.3s ease;
}

.volume-header:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateX(5px);
}

.volume-icon {
    font-size: 18px;
    color: var(--primary);
    width: 24px;
    text-align: center;
}

.volume-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

/* Grid de Materiais */
.materiais-grid {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

/* Card Individual do Material */
.material-card {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 18px;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-lg);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    text-decoration: none;
}

.material-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.05), transparent);
    transition: left 0.6s ease;
}

.material-card:hover::before {
    left: 100%;
}

.material-card:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
}

.material-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    transition: all 0.3s ease;
    flex-shrink: 0;
}

.material-card:hover .material-icon {
    background: var(--primary);
    transform: scale(1.1) rotate(5deg);
}

.material-card:hover .material-icon i {
    color: #000;
}

.material-icon i {
    font-size: 16px;
    color: var(--text-primary);
    transition: color 0.3s ease;
}

.material-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.material-name {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.3;
}

.material-size {
    font-size: 12px;
    color: var(--text-secondary);
    opacity: 0.8;
}

.download-btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    transition: all 0.3s ease;
    flex-shrink: 0;
    opacity: 0;
    transform: scale(0.8);
}

.material-card:hover .download-btn {
    opacity: 1;
    transform: scale(1);
    background: var(--primary);
}

.download-btn i {
    font-size: 14px;
    color: var(--text-primary);
    transition: color 0.3s ease;
}

.material-card:hover .download-btn i {
    color: #000;
}

/* Seção de Créditos */
.creditos-section {
    padding: 100px 0;
    background: linear-gradient(180deg, var(--bg-dark) 0%, var(--bg-light) 100%);
}

.creditos-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-bottom: 60px;
}

.creditos-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 40px 30px;
    text-align: center;
    transition: all var(--transition-normal);
    backdrop-filter: blur(10px);
}

.creditos-card:hover {
    transform: translateY(-5px);
    border-color: rgba(255, 255, 255, 0.3);
}

.creditos-icon {
    font-size: 48px;
    margin-bottom: 20px;
    color: var(--primary);
}

.creditos-card h3 {
    font-size: 24px;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.creditos-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Staff Section */
.staff-section {
    padding: 80px 0;
    background: linear-gradient(180deg, var(--bg-light) 0%, var(--bg-dark) 100%);
}

.staff-title {
    font-size: clamp(1.8rem, 3vw, 2.5rem);
    font-weight: 700;
    margin-bottom: 40px;
    text-align: center;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.staff-grid {
    display: flex;
    justify-content: center;
    gap: 40px;
    flex-wrap: wrap;
}

.staff-member {
    text-align: center;
    max-width: 200px;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.5s ease;
}

.staff-member.visible {
    opacity: 1;
    transform: translateY(0);
}

.staff-avatar {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--primary);
    margin-bottom: 15px;
    transition: all var(--transition-normal);
}

.staff-member:hover .staff-avatar {
    transform: scale(1.05);
    box-shadow: 0 10px 20px rgba(255, 255, 255, 0.2);
}

.staff-name {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 5px;
}

.staff-role {
    font-size: 14px;
    color: var(--text-secondary);
}

/* Footer */
footer {
    background: linear-gradient(145deg, #0a0a0a, var(--bg-dark));
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 50px;
    margin-bottom: 40px;
}

.footer-brand {
    max-width: 400px;
}

.footer-logo {
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
}

.footer-logo img {
    height: 50px;
    filter: grayscale(100%) brightness(200%);
}

.footer-description {
    color: var(--text-secondary);
    line-height: 1.6;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.link-group h4 {
    color: var(--text-primary);
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 20px;
}

.link-group ul {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.link-group a {
    color: var(--text-secondary);
    transition: color var(--transition-normal);
    position: relative;
    padding-left: 0;
    transition: padding-left 0.3s ease;
}

.link-group a:hover {
    color: var(--primary);
    padding-left: 10px;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-credits {
    color: var(--text-secondary);
}

.footer-credits strong {
    color: var(--primary);
    font-weight: 600;
}

.social-links {
    display: flex;
    gap: 15px;
}

.social-link {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    transition: all var(--transition-normal);
}

.social-link:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.social-link.instagram:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--primary);
}

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

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

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

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

/* Loading Animation */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: var(--primary);
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Efeito de entrada em cascata para cards */
.serie-card {
    opacity: 0;
    transform: translateY(30px) scale(0.95);
    animation: cardEntrance 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
}

@keyframes cardEntrance {
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* Delay escalonado para os cards */
.serie-card:nth-child(1) { animation-delay: 0.1s; }
.serie-card:nth-child(2) { animation-delay: 0.2s; }
.serie-card:nth-child(3) { animation-delay: 0.3s; }
.serie-card:nth-child(4) { animation-delay: 0.4s; }
.serie-card:nth-child(5) { animation-delay: 0.5s; }
.serie-card:nth-child(6) { animation-delay: 0.6s; }
.serie-card:nth-child(7) { animation-delay: 0.7s; }

/* Responsive Design */
@media (max-width: 968px) {
    .nav-links {
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        background: rgba(15, 15, 15, 0.95);
        flex-direction: column;
        align-items: center;
        padding: 20px 0;
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
        backdrop-filter: blur(12px);
        border-bottom: 1px solid var(--border-color);
    }
    
    .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-links li {
        margin: 15px 0;
    }
    
    .hamburger {
        display: flex;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }
    
    .series-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .hero {
        padding: 150px 0 80px;
    }
    
    .cta-buttons {
        flex-direction: column;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .staff-grid {
        flex-direction: column;
        align-items: center;
    }
    
    .creditos-content {
        grid-template-columns: 1fr;
    }
    
    .card-content {
        padding: 20px;
    }
    
    .card-header {
        flex-direction: column;
        gap: 10px;
        align-items: flex-start;
    }
    
    .material-card {
        padding: 15px;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .hero p {
        font-size: 16px;
    }
    
    .btn {
        padding: 12px 24px;
    }
    
    .serie-card {
        margin: 0 -10px;
        border-radius: var(--radius-lg);
    }
    
    .card-content {
        padding: 15px;
    }
    
    .material-card {
        flex-direction: column;
        text-align: center;
        gap: 10px;
    }
    
    .download-btn {
        opacity: 1;
        transform: scale(1);
    }
}