@import url("https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Space+Grotesk:wght@400;500;600;700&display=swap");

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

:root {
    --black: #000000;
    --white: #ffffff;
    --gray-lighter: #999999;
    --gray-light: #666666;
}
body {
    font-family: "Inter", sans-serif;
    background: var(--black);
    color: var(--white);
    overflow-x: hidden;
    line-height: 1.6;
}
a {
    color: var(--gray-lighter);
    text-decoration: none;
    transition: all 0.3s ease;
}
a:hover {
    color: var(--white);
}
.bg-grid {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: linear-gradient(rgba(255, 255, 255, 0.08) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.08) 1px, transparent 1px);
    background-size: 50px 50px;
    z-index: -1;
}
nav {
    position: sticky !important;
    top: 0;
    width: 100%;
    padding: 1.5rem 2rem;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(20px);
    z-index: 1000;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}
.navbar-brand {
    font-family: "Space Grotesk", sans-serif;
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--white) !important;
}
.nav-link {
    color: var(--gray-lighter) !important;
    font-size: 0.95rem;
    font-weight: 400;
    position: relative;
    transition: color 0.3s;
    padding: 0.5rem 1rem !important;
    text-transform: uppercase;
}
.nav-link::before {
    content: "";
    position: absolute;
    bottom: 0;
    left: 1rem;
    width: 0;
    height: 1px;
    background: var(--white);
    transition: width 0.3s;
}
.nav-link:hover {
    color: var(--white) !important;
}
.nav-link:hover::before {
    width: calc(100% - 2rem);
}
.categories-filter {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
    margin: 3rem 0;
}
.category-btn {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--gray-lighter);
    padding: 0.75rem 1.5rem;
    font-family: "Inter", sans-serif;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    cursor: pointer;
    transition: all 0.3s ease;
}
.category-btn:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.2);
    color: var(--white);
}

.category-btn.active {
    background: var(--white);
    color: var(--black);
    border-color: var(--white);
}
.article-date {
    color: var(--gray-light);
    font-size: 0.85rem;
    margin-bottom: 1rem;
}
.hero-section {
    min-height: 90vh;
    display: flex;
    align-items: center;
    padding-top: 1rem;
}
.hero-title {
    font-family: "Space Grotesk", sans-serif;
    font-size: clamp(2.5rem, 8vw, 5rem);
    font-weight: 700;
    margin-bottom: 2rem;
}
.hero-presentation-text {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--gray-lighter);
    max-width: 600px;
    margin-bottom: 3rem;
}
.section-title {
    font-family: "Space Grotesk", sans-serif;
    font-size: 2.5rem;
    font-weight: 600;
    margin: 4rem 0 3rem;
}
.articles-container {
    position: relative;
}
.article-card {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.05);
    padding: 3rem;
    margin-bottom: 2rem;
    transition: all 0.3s ease;
    position: sticky;
    background-color: var(--black);
    min-height: 400px;
    will-change: transform, opacity;
}
.article-card:hover {
    border-color: rgba(255, 255, 255, 0.2);
}
.article-1 {
    top: 80px;
}
.article-2 {
    top: 100px;
}
.article-3 {
    top: 120px;
}
.article-4 {
    top: 140px;
}
.article-title {
    font-family: "Space Grotesk", sans-serif;
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}
.article-context {
    color: var(--gray-light);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 1rem;
}
.article-description {
    color: var(--gray-lighter);
    margin-bottom: 1rem;
    line-height: 1.7;
}
.box {
    opacity: 0;
    transform: translateY(30px);
    transition:
        opacity 0.6s ease,
        transform 0.6s ease;
}
.box.visible {
    opacity: 1;
    transform: translateY(0);
}
.btn-outline-secondary {
    color: var(--white);
    border-color: rgba(255, 255, 255, 0.2);
    transition: all 0.3s ease;
}
.btn-outline-secondary:hover {
    background: var(--white);
    color: var(--black);
    border-color: var(--white);
}
.all-articles-container {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    margin-bottom: 4rem;
}
.all-articles-container .article-card {
    position: relative;
    top: 0 !important;
    min-height: auto;
    flex: 0 1 calc(33.333% - 1.35rem);
}
.article-wrapper {
    padding-top: 2rem;
    padding-bottom: 4rem;
}
.back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--gray-lighter);
    font-size: 0.95rem;
    margin-bottom: 2rem;
    transition: all 0.3s ease;
}
.back-link:hover {
    color: var(--white);
    transform: translateX(-5px);
}
.article-header {
    padding: 3rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    margin-bottom: 3rem;
}
.article-page-title {
    font-family: "Space Grotesk", sans-serif;
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1.5rem;
}
.article-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    color: var(--gray-light);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
.article-content {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--gray-lighter);
}
.article-content .intro-paragraph {
    font-size: 1.25rem;
    color: var(--white);
    margin-bottom: 2rem;
}
.article-content h2 {
    font-family: "Space Grotesk", sans-serif;
    font-size: 2rem;
    font-weight: 600;
    color: var(--white);
    margin-top: 3rem;
    margin-bottom: 1.5rem;
}
.article-content h3 {
    font-family: "Space Grotesk", sans-serif;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--white);
    margin-top: 2.5rem;
    margin-bottom: 1rem;
}
.article-content p {
    margin-bottom: 1.5rem;
}
.article-content ul,
.article-content ol {
    margin-bottom: 2rem;
    padding-left: 2rem;
}
.article-content li {
    margin-bottom: 0.75rem;
}
.article-content strong {
    color: var(--white);
    font-weight: 600;
}
.article-content code {
    background: rgba(255, 255, 255, 0.05);
    padding: 0.2rem 0.5rem;
    border-radius: 3px;
    font-family: "Courier New", monospace;
    font-size: 0.95em;
    color: var(--white);
}
.article-content pre {
    background: rgba(255, 255, 255, 0.05);
    padding: 1.5rem;
    border-radius: 5px;
    overflow-x: auto;
    margin: 2rem 0;
    border: 1px solid rgba(255, 255, 255, 0.1);
}
.article-content pre code {
    background: none;
    padding: 0;
}
.article-content blockquote {
    border-left: 3px solid var(--white);
    padding-left: 1.5rem;
    margin: 2rem 0;
    font-style: italic;
    color: var(--gray-lighter);
}
.highlight-box {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 2rem;
    margin: 2rem 0;
    border-radius: 5px;
}
.highlight-box strong {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--white);
}
.article-footer {
    margin-top: 5rem;
    padding-top: 3rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}
.article-nav {
    display: flex;
    justify-content: space-between;
    gap: 2rem;
}
.nav-prev,
.nav-next {
    flex: 1;
}
.nav-next {
    text-align: right;
}
.nav-label {
    font-size: 0.85rem;
    color: var(--gray-light);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}
.nav-title {
    color: var(--white);
    font-size: 1.1rem;
    display: block;
}
.nav-title:hover {
    color: var(--gray-lighter);
}
.scroll-to-top {
    position: fixed;
    bottom: 20px;
    right: 20px;
    color: var(--white);
    background: var(--gray-dark);
    padding: 15px;
    border-radius: 2rem;
    border: 1px solid var(--gray-light);
    font-size: 20px;
    text-align: center;
    cursor: pointer;
    z-index: 1000;
    transition:
        background 0.3s,
        color 0.3s,
        transform 0.3s;
}
.scroll-to-top:hover {
    background: var(--white);
    color: var(--black);
    transform: translateY(-7px);
}