/* ==========================================================================
   DESIGN SYSTEM: THE SOVEREIGN ARCHIVE (Signal Tribune)
   ========================================================================== */

:root {
    /* Color Palette */
    --background: #0b1326;
    --surface: #0b1326;
    --surface-container-low: #131b2e;
    --surface-container-high: #222a3d;
    --surface-bright: #31394d;

    --primary: #bdc2ff;
    --primary-container: #818cf8;

    --on-surface: #dae2fd;
    --on-background: #dae2fd;
    --secondary: #c1c7cf;
    --accent: #818CF8;

    --outline-variant: #454653;

    /* Ambient Shadow */
    --ambient-glow: 0 0 40px rgba(218, 226, 253, 0.1);

    /* Spacing Scale (Institutional Breathing Room) */
    --space-xs: 8px;
    --space-sm: 16px;
    --space-md: 32px;
    --space-lg: 64px;
    --space-xl: 96px;
    --space-xxl: 128px;
}

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

body {
    background-color: var(--background);
    color: var(--on-surface);
    font-family: 'Inter', sans-serif;
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

/* Typography (The Editorial Voice) */
h1,
h2,
h3,
.intro-text {
    font-family: 'Newsreader', serif;
    font-weight: 600;
    line-height: 1.2;
    color: #ffffff;
}

h1 {
    font-size: clamp(2.5rem, 5vw, 3rem);
    letter-spacing: -0.02em;
    margin-bottom: var(--space-md);
}

h2 {
    font-size: clamp(1.8rem, 3vw, 2.5rem);
    margin: var(--space-lg) 0 var(--space-sm);
}

h3 {
    font-size: 1.2rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--primary-container);
    margin-bottom: var(--space-sm);
    font-family: 'Inter', sans-serif;
    /* Subheads use Sans */
}

p {
    font-size: 1.125rem;
    margin-bottom: var(--space-md);
    font-weight: 300;
    color: var(--secondary);
}

.intro-text {
    font-size: 1.5rem;
    color: var(--on-surface);
    font-style: italic;
}

/* Top Bar (No Borders) */
.top-bar {
    background-color: var(--surface-container-low);
    color: var(--secondary);
    text-align: center;
    padding: var(--space-xs);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-weight: 500;
}

/* Header (Glass & Gradient Rule) */
.site-header {
    background-color: rgba(49, 57, 77, 0.6);
    /* surface_bright at 60% */
    backdrop-filter: blur(24px);
    padding: var(--space-sm) 0;
    top: 0;
    z-index: 100;
}

.header-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.site-logo {
    height: 32px;
    width: auto;
    filter: brightness(0) invert(1);
}

/* Buttons */
.btn-cta-header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-container) 100%);
    color: #131e8c;
    /* on_primary */
    text-decoration: none;
    font-weight: 600;
    padding: 10px 24px;
    border-radius: 0.25rem;
    font-size: 0.875rem;
    transition: all 0.3s ease;
    border: none;
}

.btn-cta-header:hover {
    box-shadow: var(--ambient-glow);
    transform: translateY(-1px);
}

.btn-cta-main {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-container) 100%);
    color: #131e8c;
    text-decoration: none;
    font-weight: 700;
    padding: 18px 56px;
    border-radius: 0.25rem;
    font-size: 1.1rem;
    transition: all 0.3s ease;
}

.btn-cta-main:hover {
    box-shadow: var(--ambient-glow);
    transform: translateY(-2px);
}

/* Layout Container (Intentional Asymmetry) */
.article-container {
    max-width: 1400px;
    margin: var(--space-xl) auto;
    padding: 0 var(--space-lg);
}

.article-header {
    margin-bottom: 30px;
    padding-bottom: var(--space-md);
    max-width: 100%;
}

.article-meta {
    color: var(--primary);
    font-size: 0.9rem;
    display: flex;
    gap: var(--space-md);
    font-family: 'Inter', sans-serif;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.author-name {
    font-weight: 600;
}

/* Editorial Grid */
.editorial-grid {
    display: grid;
    grid-template-columns: 1fr 380px;
    gap: var(--space-xl);
    align-items: start;
}

.content-primary {
    max-width: 820px;
}

.article-image {
    width: 100%;
    height: 400px;
    object-fit: cover;
    border-radius: 0.25rem;
    /* Institutional sharpness */
    margin: var(--space-md) 0 0 0;

    box-shadow: var(--ambient-glow);
}

/* Sidebar (Surface Container Low) */
.content-sidebar {
    position: sticky;
    top: 120px;
}

.sidebar-widget {
    background-color: var(--surface-container-low);
    padding: var(--space-lg);
    border-radius: 0.25rem;
    margin-bottom: var(--space-md);
}

.toc-nav ul {
    list-style: none;
}

.toc-nav li {
    padding: 1rem 0;
}

/* No 1px lines, use padding for separation */
.toc-nav a {
    color: var(--secondary);
    text-decoration: none;
    font-size: 0.95rem;
    transition: color 0.2s;
    display: block;
}

.toc-nav a:hover {
    color: var(--primary);
}

.promo {
    background-color: var(--surface-container-high);
}

.sidebar-tag {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--primary-container);
    margin-bottom: var(--space-xs);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* CTA Section */
.cta-block {
    margin: var(--space-xxl) 0 var(--space-xl);
    background-color: var(--surface-container-low);
    border-radius: 0.25rem;
    position: relative;
    box-shadow: var(--ambient-glow);
}

.cta-inner {
    padding: var(--space-xl);
}

.cta-offer-box {
    margin-top: var(--space-md);
    padding: var(--space-lg);
    background-color: var(--background);
    /* Surface depth stacking */
    border-radius: 0.25rem;
    text-align: center;
}

.cta-offer-logo {
    max-width: 220px;
    height: auto;
    /* Using Ghost Border instead of harsh outline */
    border: 1px solid rgba(69, 70, 83, 0.3);
    padding: 16px;
    background-color: white;
    margin-bottom: var(--space-lg);
    transition: all 0.3s ease;
    border-radius: 0.25rem;
}

.cta-offer-logo:hover {
    border-color: var(--primary-container);
    box-shadow: var(--ambient-glow);
}

.cta-action-text {
    font-size: 1.05rem;
    color: var(--on-surface);
    max-width: 650px;
    margin: 0 auto var(--space-md);
}

/* Disclaimer */
.advertorial-disclaimer {
    font-size: 0.8rem;
    color: var(--secondary);
    font-style: italic;
    margin-top: var(--space-xl);
    padding: var(--space-md);
    background-color: var(--surface-container-low);
    border-radius: 0.25rem;
    line-height: 1.6;
}

/* Footer */
.site-footer {
    background-color: var(--surface-container-low);
    padding: var(--space-xl) 0;
    margin-top: var(--space-xxl);
}

.footer-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
    text-align: center;
}

.footer-nav {
    display: flex;
    justify-content: center;
    gap: var(--space-lg);
    margin-bottom: var(--space-lg);
    flex-wrap: wrap;
}

.footer-nav a {
    color: var(--secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.2s;
    font-weight: 500;
}

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

.contact-details {
    margin-bottom: var(--space-md);
    color: var(--secondary);
    font-size: 0.875rem;
}

.copyright {
    color: var(--outline-variant);
    font-size: 0.8rem;
}

/* Responsive */
@media (max-width: 1024px) {
    .editorial-grid {
        grid-template-columns: 1fr;
    }

    .content-sidebar {
        display: none;
        /* Simplify on mobile */
    }

    .content-primary {
        max-width: 100%;
    }
}

@media (max-width: 768px) {
    .article-header {
        margin-bottom: var(--space-lg);
    }

    h1 {
        font-size: 2.2rem;
    }

    .header-container,
    .article-container,
    .footer-container {
        padding: 0 var(--space-md);
    }
}