:root {
    --indigo: #243572;
    --teal: #2D909A;
    --stone: #8C8C8C;
    --peach: #F2C2A0;
    --white: #FAFAFA;
    --charcoal: #1A1A1A;
    --muted-bg: #F4F5F7;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Libre Franklin', sans-serif;
    background: var(--white);
    color: var(--charcoal);
    line-height: 1.75;
}

a {
    color: inherit;
}

.reading-progress {
    position: fixed;
    top: 72px;
    left: 0;
    width: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--teal), var(--indigo));
    z-index: 999;
    transition: width 0.1s ease;
}

nav {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(250, 250, 250, 0.98);
    backdrop-filter: blur(12px);
    z-index: 1000;
    border-bottom: 1px solid rgba(36, 53, 114, 0.1);
    transition: box-shadow 0.3s ease;
}

nav.scrolled {
    box-shadow: 0 2px 20px rgba(36, 53, 114, 0.08);
}

nav .container,
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1.25rem 2rem;
}

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

.logo {
    font-family: 'Crimson Pro', serif;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--indigo);
    letter-spacing: -0.5px;
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.nav-links a {
    text-decoration: none;
    color: var(--charcoal);
    font-weight: 500;
    font-size: 0.95rem;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--teal);
    transition: width 0.3s ease;
}

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}

.page-shell {
    margin-top: 75px;
}

.article-header {
    background: linear-gradient(135deg, var(--indigo) 0%, #1a2850 100%);
    color: white;
    padding: 5rem 2rem 3rem;
    position: relative;
    overflow: hidden;
}

.article-header::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 20% 50%, rgba(45, 144, 154, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(242, 194, 160, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.article-header .container {
    max-width: 900px;
    position: relative;
    z-index: 1;
}

.article-category {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: rgba(45, 144, 154, 0.2);
    border: 1px solid rgba(45, 144, 154, 0.4);
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 1.5rem;
    color: var(--peach);
}

.article-header h1 {
    font-family: 'Crimson Pro', serif;
    font-size: 3.4rem;
    line-height: 1.15;
    letter-spacing: -1px;
    margin-bottom: 1.25rem;
}

.article-subtitle {
    font-size: 1.25rem;
    color: rgba(250, 250, 250, 0.9);
    max-width: 760px;
}

.article-main {
    max-width: 1400px;
    margin: 0 auto;
    padding: 4rem 2rem;
    display: grid;
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 4rem;
    align-items: start;
}

.article-body {
    max-width: 820px;
}

.article-body p,
.article-body li {
    font-size: 1.05rem;
}

.article-body p,
.article-body ul,
.article-body ol,
.article-body blockquote,
.feature-grid,
.stat-grid {
    margin-bottom: 1.5rem;
}

.article-body h2,
.article-body h3 {
    font-family: 'Crimson Pro', serif;
    color: var(--indigo);
}

.article-body h2 {
    font-size: 2.1rem;
    margin: 3rem 0 1rem;
}

.article-body h3 {
    font-size: 1.45rem;
    margin: 2rem 0 0.75rem;
}

.article-body ul,
.article-body ol {
    padding-left: 1.5rem;
}

.article-body li {
    margin-bottom: 0.65rem;
}

.article-body li::marker {
    color: var(--teal);
}

.article-body blockquote {
    padding: 1.75rem;
    background: linear-gradient(to right, rgba(45, 144, 154, 0.07), transparent);
    border-left: 4px solid var(--teal);
    font-style: italic;
}

.callout {
    margin: 2rem 0;
    padding: 1.5rem;
    background: white;
    border-radius: 12px;
    border-left: 4px solid var(--indigo);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
}

.callout.tip {
    border-left-color: var(--teal);
    background: linear-gradient(to right, rgba(45, 144, 154, 0.03), white);
}

.callout.warning {
    border-left-color: var(--peach);
    background: linear-gradient(to right, rgba(242, 194, 160, 0.12), white);
}

.callout-title {
    font-family: 'Crimson Pro', serif;
    font-size: 1.25rem;
    color: var(--indigo);
    margin-bottom: 0.5rem;
}

.pull-quote {
    margin: 2.5rem 0;
    padding: 2rem;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--indigo), var(--teal));
    color: white;
    font-family: 'Crimson Pro', serif;
    font-size: 1.6rem;
    line-height: 1.45;
}

.feature-grid,
.stat-grid,
.link-grid,
.related-grid {
    display: grid;
    gap: 1.5rem;
}

.feature-grid,
.link-grid {
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.stat-grid {
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

.feature-card,
.stat-card,
.link-card,
.sidebar-card,
.related-card {
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
}

.feature-card,
.link-card {
    padding: 1.5rem;
}

.feature-card h3,
.link-card h3,
.related-card h3 {
    font-family: 'Crimson Pro', serif;
    color: var(--indigo);
}

.stat-card {
    padding: 1.5rem;
    background: linear-gradient(135deg, rgba(36, 53, 114, 0.04), rgba(45, 144, 154, 0.06));
}

.stat-card strong {
    display: block;
    font-family: 'Crimson Pro', serif;
    font-size: 2rem;
    color: var(--indigo);
    margin-bottom: 0.25rem;
}

.article-sidebar {
    position: sticky;
    top: 110px;
}

.sidebar-section {
    margin-bottom: 1.5rem;
}

.sidebar-card {
    padding: 1.25rem;
}

.sidebar-title {
    font-family: 'Crimson Pro', serif;
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--indigo);
    margin-bottom: 0.85rem;
}

.toc ul,
.sidebar-card ul {
    list-style: none;
}

.toc li,
.sidebar-card li {
    margin-bottom: 0.7rem;
}

.toc a,
.sidebar-card a {
    text-decoration: none;
    color: var(--charcoal);
}

.toc a.active,
.toc a:hover,
.sidebar-card a:hover {
    color: var(--teal);
}

.cta-box {
    background: linear-gradient(135deg, var(--teal), var(--indigo));
    color: white;
    padding: 1.5rem;
    border-radius: 12px;
}

.cta-box h3 {
    font-family: 'Crimson Pro', serif;
    margin-bottom: 0.5rem;
}

.cta-box p {
    margin-bottom: 1rem;
}

.cta-button {
    display: inline-block;
    padding: 0.85rem 1.25rem;
    background: white;
    color: var(--indigo);
    text-decoration: none;
    border-radius: 6px;
    font-weight: 600;
}

.related-articles {
    background: var(--muted-bg);
    padding: 4rem 2rem;
}

.related-articles .container {
    padding: 0;
}

.related-articles h2 {
    font-family: 'Crimson Pro', serif;
    font-size: 2.4rem;
    color: var(--indigo);
    text-align: center;
    margin-bottom: 2rem;
}

.related-grid {
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.related-card {
    display: block;
    padding: 1.5rem;
    text-decoration: none;
    color: inherit;
}

.related-card-category {
    color: var(--teal);
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 0.75rem;
}

.related-card p {
    margin-top: 0.75rem;
}

footer {
    background: var(--charcoal);
    color: rgba(250, 250, 250, 0.8);
    padding: 4rem 2rem 2rem;
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto 3rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 2rem;
}

.footer-section h4 {
    font-family: 'Crimson Pro', serif;
    font-size: 1.2rem;
    color: white;
    margin-bottom: 1rem;
}

.footer-section ul {
    list-style: none;
}

.footer-section li {
    margin-bottom: 0.7rem;
}

.footer-section a {
    text-decoration: none;
    color: rgba(250, 250, 250, 0.8);
}

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

.footer-bottom {
    max-width: 1400px;
    margin: 0 auto;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(250, 250, 250, 0.1);
    font-size: 0.9rem;
    text-align: center;
}

@media (max-width: 1024px) {
    .article-main {
        grid-template-columns: 1fr;
        gap: 2.5rem;
    }

    .article-sidebar {
        position: static;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .article-header h1 {
        font-size: 2.45rem;
    }

    .article-subtitle {
        font-size: 1.1rem;
    }

    .article-body h2 {
        font-size: 1.8rem;
    }

    .pull-quote {
        font-size: 1.3rem;
    }
}