/* ===================================================================
   HOMEPAGE SPECIFIC STYLES — index.html
   =================================================================== */

body {
    font-family: 'Inter', -apple-system, sans-serif;
    background-color: var(--bg-body);
    color: var(--text-main);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    transition: background-color 0.4s ease, color 0.4s ease;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 16px;
}

section {
    margin-bottom: 56px;
    position: relative;
}

/* --- HEADER & NAVIGATION --- */
header {
    background: var(--bg-card);
    padding: 20px 0;
    border-bottom: 1px solid var(--border);
    margin-bottom: 40px;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(12px);
    background: color-mix(in srgb, var(--bg-card), transparent 10%);
    transition: background-color 0.4s ease, border-color 0.4s ease;
}

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

.brand-group {
    display: flex;
    flex-direction: column;
}

.brand h1 {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--text-main);
    letter-spacing: -0.5px;
}

.brand p {
    color: var(--text-muted);
    font-weight: 500;
    font-size: 0.82rem;
    letter-spacing: 0.1px;
}

.controls {
    display: flex;
    align-items: center;
    gap: 12px;
}

.nav-highlight {
    background-color: var(--primary);
    color: #ffffff !important;
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.82rem;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 6px;
    border: 1px solid var(--primary);
}

.nav-highlight:hover {
    background-color: var(--primary-hover);
    border-color: var(--primary-hover);
}

.social-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 600;
    padding: 6px 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    transition: all 0.2s ease;
    font-size: 0.8rem;
    background: var(--bg-card);
}

.social-link:hover {
    border-color: var(--primary);
    color: var(--primary);
}

/* --- SECTION HEADER --- */
.section-header {
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 16px;
}

.section-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-main);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-family: 'Inter', monospace;
}

.section-line {
    height: 1px;
    background: var(--border);
    flex-grow: 1;
}

/* --- LATEST PAPERS SLIDER --- */
.paper-section-wrapper {
    position: relative;
}

.paper-scroll-container {
    display: flex;
    gap: 20px;
    overflow-x: auto;
    padding: 4px 4px 20px 4px;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    scroll-behavior: smooth;
    cursor: grab;
    user-select: none;
}

.paper-scroll-container.active {
    cursor: grabbing;
    cursor: -webkit-grabbing;
    scroll-snap-type: none;
    scroll-behavior: auto;
}

.paper-scroll-container::-webkit-scrollbar {
    height: 6px;
}

.paper-scroll-container::-webkit-scrollbar-track {
    background: transparent;
}

.paper-scroll-container::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 10px;
}

.paper-card {
    flex: 0 0 300px;
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
    scroll-snap-align: start;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
    transition: border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
    border: 1px solid var(--border);
    -webkit-user-drag: none;
}

.paper-card:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.paper-date {
    font-size: 0.68rem;
    color: var(--text-muted);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-family: 'Inter', monospace;
    font-weight: 600;
}

.paper-title {
    font-size: 1.0rem;
    font-weight: 600;
    margin-bottom: 12px;
    line-height: 1.4;
    color: var(--text-main);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.paper-comment {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
    flex-grow: 1;
    font-style: italic;
    line-height: 1.5;
}

.paper-link {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--primary);
    text-decoration: none;
    padding-top: 12px;
    border-top: 1px solid var(--border);
    margin-top: auto;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: color 0.2s;
    pointer-events: auto;
}

.paper-scroll-container.active .paper-link {
    pointer-events: none;
}

.paper-link:hover {
    color: var(--primary-hover);
}

.slider-nav-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: var(--shadow);
    z-index: 10;
    transition: all 0.2s ease;
}

.slider-nav-btn:hover {
    background: var(--bg-surface);
    border-color: var(--border-strong);
    color: var(--text-main);
}

.slider-nav-btn.prev {
    left: -18px;
}

.slider-nav-btn.next {
    right: -18px;
}

/* --- PROJECTS PORTFOLIO --- */
.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(min(100%, 280px), 1fr));
    gap: 20px;
}

.project-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
    transition: border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
    text-decoration: none;
    color: inherit;
    border: 1px solid var(--border);
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.project-icon {
    margin-bottom: 12px;
    width: 36px;
    height: 36px;
    background: var(--bg-surface);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    font-size: 1.1rem;
    border: 1px solid var(--border);
}

.project-title {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--text-main);
}

.project-desc {
    font-size: 0.8rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* --- FOOTER --- */
footer {
    text-align: center;
    padding: 48px 24px;
    color: var(--text-muted);
    font-size: 0.82rem;
    margin-top: 40px;
    border-top: 1px solid var(--border);
}

footer a {
    color: var(--text-secondary);
    text-decoration: none;
}

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

/* --- RESPONSIVE ADJUSTMENTS --- */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }

    .controls {
        width: 100%;
        justify-content: space-between;
    }

    .social-link span,
    .nav-highlight span { 
        display: none; 
    }

    .social-link {
        padding: 0;
        width: 36px;
        height: 36px;
        display: flex;
        align-items: center;
        justify-content: center;
        border-radius: var(--radius-sm);
        font-size: 0.95rem;
    }

    .nav-highlight {
        padding: 0 12px;
        height: 36px;
        border-radius: var(--radius-sm);
        font-size: 0.82rem;
    }

    .nav-highlight::after {
        content: 'Blog';
    }

    .paper-card {
        flex: 0 0 250px;
        padding: 20px;
    }

    .slider-nav-btn {
        display: none;
    }
}