@import url('https://fonts.googleapis.com/css2?family=DM+Serif+Display&family=Outfit:wght@300;400;500;600&display=swap');

:root {
    --bg-primary: #FAFAFA;
    --bg-secondary: #F0F1F3;
    --bg-card: #FFFFFF;
    --text-primary: #1A1A2E;
    --text-secondary: #6B7280;
    --text-muted: #9CA3AF;
    --accent: #1A5F7A;
    --accent-dim: rgba(26, 95, 122, 0.06);
    --accent-glow: rgba(26, 95, 122, 0.15);
    --border: #E5E7EB;
    --border-light: rgba(0, 0, 0, 0.04);
    --serif: 'DM Serif Display', Georgia, serif;
    --sans: 'Outfit', -apple-system, sans-serif;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* ---- NAV ---- */
nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 1.25rem 2.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    backdrop-filter: blur(20px);
    background: rgba(250, 250, 250, 0.85);
    border-bottom: 1px solid var(--border);
    transition: background 0.3s ease;
}

.logo {
    font-family: var(--serif);
    font-size: 1.25rem;
    color: var(--text-primary);
    letter-spacing: -0.01em;
    text-decoration: none;
    white-space: nowrap;
}

.logo span {
    color: var(--accent);
}

.nav-links {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.825rem;
    font-weight: 400;
    letter-spacing: 0.02em;
    transition: color 0.25s ease;
    white-space: nowrap;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--accent);
}

/* Mobile menu button */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    color: var(--text-primary);
}

.menu-toggle svg {
    width: 24px;
    height: 24px;
}

/* ---- PAGE HEADER ---- */
.page-header {
    padding: 8rem 2rem 3rem;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.page-header h1 {
    font-family: var(--serif);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 400;
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.page-header p {
    font-size: 1.1rem;
    font-weight: 300;
    color: var(--text-secondary);
    line-height: 1.7;
    max-width: 600px;
    margin: 0 auto;
}

/* ---- PAGE CONTENT ---- */
.page-content {
    max-width: 760px;
    margin: 0 auto;
    padding: 2rem 2rem 4rem;
}

.page-content p {
    font-size: 1.1rem;
    font-weight: 300;
    color: var(--text-secondary);
    line-height: 1.85;
    margin-bottom: 1.5rem;
}

.page-content p strong {
    color: var(--text-primary);
    font-weight: 500;
}

.page-content h2 {
    font-family: var(--serif);
    font-size: 1.75rem;
    font-weight: 400;
    margin: 3rem 0 1.25rem;
    color: var(--text-primary);
}

.page-content h3 {
    font-family: var(--serif);
    font-size: 1.3rem;
    font-weight: 400;
    margin: 2rem 0 1rem;
    color: var(--text-primary);
}

.page-content a {
    color: var(--accent);
    text-decoration: underline;
    text-underline-offset: 3px;
    transition: opacity 0.25s ease;
}

.page-content a:hover {
    opacity: 0.7;
}

/* ---- CARDS GRID ---- */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 2rem 4rem;
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 2.25rem 2rem;
    transition: all 0.35s ease;
    position: relative;
    overflow: hidden;
    box-shadow: 0 2px 8px var(--border-light);
    text-decoration: none;
    color: inherit;
    display: block;
}

.card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--accent), transparent);
    opacity: 0;
    transition: opacity 0.35s ease;
}

.card:hover {
    border-color: rgba(26, 95, 122, 0.25);
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
}

.card:hover::after {
    opacity: 1;
}

.card-icon {
    font-size: 1.75rem;
    margin-bottom: 1.25rem;
    display: block;
}

.card h3 {
    font-family: var(--serif);
    font-size: 1.2rem;
    font-weight: 400;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.card p {
    font-size: 0.9rem;
    font-weight: 300;
    color: var(--text-secondary);
    line-height: 1.65;
}

/* ---- FEED ITEMS (News & Commentary, Signals) ---- */
.feed-item {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 2rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 2px 8px var(--border-light);
}

.feed-date {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-muted);
    letter-spacing: 0.05em;
    text-transform: uppercase;
    margin-bottom: 0.75rem;
}

.feed-item blockquote {
    font-size: 1.05rem;
    font-weight: 400;
    color: var(--text-primary);
    line-height: 1.7;
    border-left: 3px solid var(--accent);
    padding-left: 1.25rem;
    margin-bottom: 1rem;
    font-style: italic;
}

.feed-item .source {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.feed-item .source a {
    color: var(--accent);
    text-decoration: none;
}

.feed-item .commentary {
    font-size: 1rem;
    font-weight: 300;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ---- RESEARCH LINKS ---- */
.research-category {
    margin-bottom: 3rem;
}

.research-category h2 {
    font-family: var(--serif);
    font-size: 1.5rem;
    font-weight: 400;
    margin-bottom: 1.25rem;
    color: var(--text-primary);
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border);
}

.research-link {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.25rem 1.5rem;
    margin-bottom: 0.75rem;
    display: block;
    text-decoration: none;
    transition: all 0.25s ease;
    box-shadow: 0 1px 4px var(--border-light);
}

.research-link:hover {
    border-color: rgba(26, 95, 122, 0.25);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
}

.research-link h4 {
    font-size: 1rem;
    font-weight: 500;
    color: var(--accent);
    margin-bottom: 0.35rem;
}

.research-link .authors {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
}

.research-link .description {
    font-size: 0.9rem;
    font-weight: 300;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ---- NEWSLETTER FOOTER ---- */
.newsletter-footer {
    padding: 4rem 2rem;
    text-align: center;
    border-top: 1px solid var(--border);
    margin-top: 2rem;
}

.newsletter-footer h2 {
    font-family: var(--serif);
    font-size: 1.5rem;
    font-weight: 400;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.newsletter-footer p {
    font-size: 0.95rem;
    font-weight: 300;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.email-form {
    display: flex;
    gap: 0.75rem;
    max-width: 420px;
    margin: 0 auto;
}

.email-form input {
    flex: 1;
    padding: 0.85rem 1.15rem;
    font-family: var(--sans);
    font-size: 0.9rem;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-primary);
    outline: none;
    transition: border-color 0.25s ease;
}

.email-form input::placeholder {
    color: var(--text-muted);
}

.email-form input:focus {
    border-color: var(--accent);
}

.email-form button {
    padding: 0.85rem 1.5rem;
    font-family: var(--sans);
    font-size: 0.875rem;
    font-weight: 500;
    color: #FFFFFF;
    background: var(--accent);
    border: none;
    border-radius: 6px;
    cursor: pointer;
    white-space: nowrap;
    transition: all 0.25s ease;
}

.email-form button:hover {
    box-shadow: 0 4px 20px var(--accent-glow);
}

/* ---- FOOTER ---- */
footer {
    padding: 2rem 2.5rem;
    border-top: 1px solid var(--border);
    text-align: center;
}

footer .footer-left {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ---- PLACEHOLDER STATE ---- */
.placeholder {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-muted);
}

.placeholder-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.placeholder p {
    font-size: 1rem;
    font-weight: 300;
}

/* ---- ANIMATIONS ---- */
@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ---- RESPONSIVE ---- */
@media (max-width: 768px) {
    nav {
        padding: 1rem 1.25rem;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(250, 250, 250, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 1rem 1.5rem 1.5rem;
        border-bottom: 1px solid var(--border);
        gap: 0.75rem;
    }

    .nav-links.open {
        display: flex;
    }

    .menu-toggle {
        display: block;
    }

    .page-header {
        padding: 6rem 1.5rem 2rem;
    }

    .cards-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
        padding: 0 1.5rem 3rem;
    }

    .email-form {
        flex-direction: column;
    }

    .page-content {
        padding: 1.5rem 1.5rem 3rem;
    }
}