/* Font Face Declarations */
@font-face {
    font-family: 'Rethink Sans';
    src: url('../fonts/Rethink Sans/RethinkSans-Regular.ttf') format('truetype');
    font-weight: 400;
    font-style: normal;
}

@font-face {
    font-family: 'Rethink Sans';
    src: url('../fonts/Rethink Sans/RethinkSans-Medium.ttf') format('truetype');
    font-weight: 500;
    font-style: normal;
}

@font-face {
    font-family: 'Rethink Sans';
    src: url('../fonts/Rethink Sans/RethinkSans-SemiBold.ttf') format('truetype');
    font-weight: 600;
    font-style: normal;
}

@font-face {
    font-family: 'Rethink Sans';
    src: url('../fonts/Rethink Sans/RethinkSans-Bold.ttf') format('truetype');
    font-weight: 700;
    font-style: normal;
}

@font-face {
    font-family: 'Literata';
    src: url('../fonts/Literata/Literata-Regular.ttf') format('truetype');
    font-weight: 400;
    font-style: normal;
}

@font-face {
    font-family: 'Literata';
    src: url('../fonts/Literata/Literata-Medium.ttf') format('truetype');
    font-weight: 500;
    font-style: normal;
}

/* CSS Variables */
:root {
    --primary-black: #000000;
    --primary-white: #ffffff;
    --light-gray: #f5f5f5;
    --medium-gray: #e0e0e0;
    --dark-gray: #333333;
    --text-gray: #666666;
    --accent-blue: #1a5490;
    --hover-blue: #2a6aa0;
    --max-width: 1200px;
    --header-height: 80px;
    --mobile-header-height: 60px;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;
    --transition: all 0.3s ease;
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Rethink Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    line-height: 1.6;
    color: var(--dark-gray);
    background-color: var(--primary-white);
    overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: 'Literata', Georgia, serif;
    font-weight: 500;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
    color: var(--primary-black);
}

h1 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
}

h2 {
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
}

h3 {
    font-size: 1.5rem;
}

p {
    margin-bottom: var(--spacing-sm);
    line-height: 1.8;
}

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

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

/* Container */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Header */
header {
    background-color: var(--primary-white);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: auto;
    padding: var(--spacing-md) 0;
}

.header-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-container {
    display: flex;
    align-items: flex-end;
    gap: var(--spacing-sm);
}

.logo {
    height: 136px;
    width: auto;
}

.site-title {
    font-family: 'Rethink Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-size: 2.06rem;
    font-weight: 600;
    color: var(--primary-black);
    letter-spacing: 0.02em;
    padding-bottom: 0.3rem;
}

/* Navigation */
nav {
    display: flex;
    justify-content: center;
    width: 100%;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
    justify-content: center;
}

.nav-menu a {
    color: var(--dark-gray);
    font-weight: 500;
    font-size: 0.95rem;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-bottom: 2px solid transparent;
    transition: var(--transition);
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--accent-blue);
    border-bottom-color: var(--accent-blue);
}

/* Language Switcher */
.language-switcher {
    display: flex;
    gap: var(--spacing-xs);
}

.lang-btn {
    background: none;
    border: 1px solid var(--medium-gray);
    padding: var(--spacing-xs) var(--spacing-sm);
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-gray);
    transition: var(--transition);
}

.lang-btn:hover {
    background-color: var(--light-gray);
    color: var(--dark-gray);
}

.lang-btn.active {
    background-color: var(--accent-blue);
    color: var(--primary-white);
    border-color: var(--accent-blue);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.hamburger {
    display: block;
    width: 25px;
    height: 2px;
    background-color: var(--dark-gray);
    position: relative;
    transition: var(--transition);
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background-color: var(--dark-gray);
    transition: var(--transition);
}

.hamburger::before {
    top: -8px;
}

.hamburger::after {
    bottom: -8px;
}

.mobile-menu-toggle.active .hamburger {
    background-color: transparent;
}

.mobile-menu-toggle.active .hamburger::before {
    top: 0;
    transform: rotate(45deg);
}

.mobile-menu-toggle.active .hamburger::after {
    bottom: 0;
    transform: rotate(-45deg);
}

/* Main Content */
main {
    margin-top: 220px;
    min-height: calc(100vh - 220px - 200px);
    padding: var(--spacing-xl) 0;
}

/* Content Sections */
.content-section {
    margin-bottom: var(--spacing-xl);
}

.content-en,
.content-pt-br {
    animation: fadeIn 0.5s ease;
}

.content-en[style*="display: none"],
.content-pt-br[style*="display: none"] {
    animation: none;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Cards */
.card {
    background-color: var(--light-gray);
    border-radius: 8px;
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

/* Grid Layouts */
.grid {
    display: grid;
    gap: var(--spacing-md);
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

/* Buttons */
.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--accent-blue);
    color: var(--primary-white);
    border: none;
    border-radius: 4px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
}

.btn:hover {
    background-color: var(--hover-blue);
    color: var(--primary-white);
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

.btn-outline {
    background-color: transparent;
    border: 2px solid var(--accent-blue);
    color: var(--accent-blue);
}

.btn-outline:hover {
    background-color: var(--accent-blue);
    color: var(--primary-white);
    border-color: var(--hover-blue);
}

/* Footer */
footer {
    background-color: var(--primary-black);
    color: var(--primary-white);
    padding: var(--spacing-lg) 0;
    margin-top: var(--spacing-xl);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.footer-section h4 {
    color: var(--primary-white);
    margin-bottom: var(--spacing-sm);
}

.footer-section p,
.footer-section a {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.875rem;
}

.footer-section a:hover {
    color: var(--primary-white);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    margin-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.6);
}

/* Responsive Design */
@media (max-width: 768px) {
    html {
        font-size: 14px;
    }

    header {
        padding: var(--spacing-xs) 0;
    }

    main {
        margin-top: 180px;
        padding: var(--spacing-md) 0;
    }

    .site-title {
        font-size: 1.25rem;
    }

    .logo {
        height: 106px;
    }

    .mobile-menu-toggle {
        display: block;
    }

    nav {
        position: fixed;
        top: 150px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 150px);
        background-color: var(--primary-white);
        flex-direction: column;
        padding: var(--spacing-md);
        transition: var(--transition);
        box-shadow: 2px 0 4px rgba(0,0,0,0.1);
        justify-content: flex-start;
    }

    nav.active {
        left: 0;
    }

    .nav-menu {
        flex-direction: column;
        width: 100%;
        justify-content: flex-start;
    }

    .nav-menu a {
        padding: var(--spacing-sm) 0;
        border-bottom: 1px solid var(--light-gray);
    }

    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.5rem;
    }

    .container {
        padding: 0 var(--spacing-sm);
    }

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

/* Utility Classes */
.text-center {
    text-align: center;
}

.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }
.mt-5 { margin-top: var(--spacing-xl); }

.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }
.mb-5 { margin-bottom: var(--spacing-xl); }

.hidden {
    display: none !important;
}