/* 
 * Living Static Journal - Style System 
 * Concept: Warm Editorial Modern (Personal Knowledge Archive)
 */

@import url('https://fonts.googleapis.com/css2?family=Inter:ital,opsz,wght@0,14..32,100..900;1,14..32,100..900&family=Playfair+Display:ital,wght@0,400..900;1,400..900&family=JetBrains+Mono:ital,wght@0,100..800;1,100..800&display=swap');

:root {
  /* Color System */
  --paper: #FBF9F6;        /* High-readability soft bone/cream background */
  --surface: #FFFFFF;      /* Clean white for card elements and elevations */
  --ink: #1E2528;          /* Rich charcoal for soft, high-contrast reading */
  --muted: #5A676B;        /* Warm slate gray for details and metadata */
  --line: #E1E6E3;         /* Thin, sharp borders representing print columns */
  
  /* Brand Editorial Accents */
  --forest: #1D3B32;       /* Forest green - primary accent */
  --clay: #C66548;         /* Terracotta/clay - active buttons, categories, links */
  --moss: #8E9E74;         /* Soft moss green - visual category tags */
  --sky: #E9EEED;          /* Cool grey-blue for clean image frames and cards */
  
  /* Typography Variables */
  --font-serif: "Playfair Display", "Lora", Georgia, serif;
  --font-sans: "Inter", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", "DM Mono", monospace;
  
  /* Layout Structures */
  --max-width: 1160px;
  --radius: 2px;           /* Crisp, precise architectural corners */
  --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  --shadow-subtle: 0 8px 32px rgba(29, 37, 40, 0.03);
  --shadow-hover: 0 16px 48px rgba(29, 37, 40, 0.08);
}

/* Dark Mode Variables (Activated via color-scheme preference) */
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #12181A;
    --surface: #1A2225;
    --ink: #E2E8E6;
    --muted: #8A9A9D;
    --line: #2C373B;
    --forest: #4CA28A;
    --clay: #DD7C60;
    --sky: #202A2E;
  }
}

/* -----------------------------------------------------
   Reset & Core Layout
----------------------------------------------------- */

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

body {
  background-color: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.62;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition);
}

/* -----------------------------------------------------
   Header / Sticky Navigation Bar
----------------------------------------------------- */

.site-header {
  background-color: rgba(251, 249, 246, 0.85);
  backdrop-filter: blur(12px) saturate(180%);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 100;
}

@media (prefers-color-scheme: dark) {
  .site-header {
    background-color: rgba(18, 24, 26, 0.85);
  }
}

.site-header-container {
  align-items: center;
  display: flex;
  justify-content: space-between;
  margin: 0 auto;
  max-width: var(--max-width);
  padding: 20px 24px;
}

.brand {
  align-items: center;
  color: var(--forest);
  display: flex;
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.brand span {
  color: var(--clay);
  font-family: var(--font-sans);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  margin-left: 10px;
  text-transform: uppercase;
}

.site-navigation {
  align-items: center;
  display: flex;
  gap: 28px;
}

.site-navigation a {
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  position: relative;
  text-transform: uppercase;
}

.site-navigation a::after {
  background-color: var(--clay);
  bottom: -6px;
  content: "";
  height: 2px;
  left: 0;
  position: absolute;
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  width: 100%;
}

.site-navigation a:hover,
.site-navigation a.active {
  color: var(--ink);
}

.site-navigation a:hover::after,
.site-navigation a.active::after {
  transform: scaleX(1);
  transform-origin: left;
}

/* -----------------------------------------------------
   Main Layout Grid
----------------------------------------------------- */

main {
  margin: 0 auto;
  max-width: var(--max-width);
  min-height: 75vh;
  padding: 48px 24px;
}

/* -----------------------------------------------------
   Homepage Layout (Magazine-Cover Hero)
----------------------------------------------------- */

.hero-cover {
  align-items: stretch;
  border-bottom: 1px solid var(--line);
  display: grid;
  gap: 40px;
  grid-template-columns: 1.1fr 0.9fr;
  margin-bottom: 56px;
  padding-bottom: 56px;
}

.hero-content {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.eyebrow {
  color: var(--clay);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  margin-bottom: 16px;
  text-transform: uppercase;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(2.2rem, 5.5vw, 3.8rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.05;
  margin-bottom: 24px;
}

.hero-lede {
  color: var(--muted);
  font-size: clamp(1.08rem, 2vw, 1.25rem);
  line-height: 1.55;
  margin-bottom: 32px;
}

.hero-image-wrapper {
  background-color: var(--sky);
  border: 1px solid var(--line);
  padding: 8px;
  position: relative;
}

.hero-image-wrapper img {
  aspect-ratio: 4 / 3;
  display: block;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
  width: 100%;
}

.hero-image-wrapper:hover img {
  filter: saturate(1.1);
}

.button-primary {
  align-self: flex-start;
  background-color: var(--forest);
  border: 1px solid var(--forest);
  color: var(--surface);
  font-size: 0.88rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  padding: 14px 28px;
  text-transform: uppercase;
  transition: var(--transition);
}

.button-primary:hover {
  background-color: transparent;
  color: var(--forest);
}

@media (prefers-color-scheme: dark) {
  .button-primary:hover {
    color: var(--forest-dark);
  }
}

/* -----------------------------------------------------
   Pillar Matrix / Editorial Grid Section
----------------------------------------------------- */

.editorial-section-header {
  border-bottom: 2px solid var(--ink);
  display: flex;
  justify-content: space-between;
  margin-bottom: 32px;
  padding-bottom: 12px;
}

.editorial-section-header h2 {
  font-family: var(--font-serif);
  font-size: 1.8rem;
  font-weight: 800;
}

.editorial-section-header .sub-info {
  align-self: flex-end;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

.editorial-pillars-grid {
  display: grid;
  gap: 36px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.pillar-column {
  display: flex;
  flex-direction: column;
}

.pillar-column-header {
  border-bottom: 1px solid var(--ink);
  color: var(--clay);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  margin-bottom: 24px;
  padding-bottom: 8px;
  text-transform: uppercase;
}

/* -----------------------------------------------------
   Article Card Layouts
----------------------------------------------------- */

.article-card {
  background-color: var(--surface);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-subtle);
  display: flex;
  flex-direction: column;
  margin-bottom: 28px;
  transition: var(--transition);
}

.article-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-4px);
}

.article-card-image-container {
  aspect-ratio: 16 / 10;
  background-color: var(--sky);
  overflow: hidden;
  position: relative;
}

.article-card-image-container img {
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
  width: 100%;
}

.article-card:hover .article-card-image-container img {
  transform: scale(1.04);
}

.category-tag {
  background-color: var(--forest);
  color: var(--surface);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  left: 12px;
  padding: 4px 8px;
  position: absolute;
  text-transform: uppercase;
  top: 12px;
}

.article-card-meta {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  margin-bottom: 12px;
}

.article-card-body {
  display: flex;
  flex-direction: column;
  flex-grow: 1;
  padding: 24px;
}

.article-card-title {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 12px;
}

.article-card-title a:hover {
  color: var(--clay);
}

.article-card-excerpt {
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.5;
}

/* Horizontal card variations */
.horizontal-card-list {
  display: grid;
  gap: 24px;
  grid-template-columns: 1fr;
}

.article-card.horizontal {
  display: grid;
  grid-template-columns: 280px 1fr;
}

.article-card.horizontal .article-card-image-container {
  aspect-ratio: auto;
  height: 100%;
}

/* -----------------------------------------------------
   Article List Sidebar Filtration
----------------------------------------------------- */

.archive-layout {
  display: grid;
  gap: 48px;
  grid-template-columns: 260px 1fr;
}

.filter-sidebar {
  position: sticky;
  top: 100px;
}

.sidebar-title {
  border-bottom: 1px solid var(--line);
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: 16px;
  padding-bottom: 8px;
}

.filter-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  list-style: none;
}

.filter-item a {
  align-items: center;
  color: var(--muted);
  display: flex;
  font-size: 0.92rem;
  font-weight: 600;
  justify-content: space-between;
}

.filter-item a.active,
.filter-item a:hover {
  color: var(--ink);
}

.filter-item .count {
  background-color: var(--sky);
  border-radius: 12px;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  padding: 2px 8px;
}

/* -----------------------------------------------------
   Reading Room: Article Detail Layout
----------------------------------------------------- */

.reading-room {
  margin: 0 auto;
  max-width: 800px;
  padding-top: 24px;
}

.reading-header {
  border-bottom: 1px solid var(--line);
  margin-bottom: 40px;
  padding-bottom: 32px;
  text-align: center;
}

.reading-eyebrow {
  color: var(--clay);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  margin-bottom: 16px;
  text-transform: uppercase;
}

.serif-article-title {
  font-family: var(--font-serif);
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin-bottom: 20px;
}

.reading-meta {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  margin-top: 16px;
}

.article-lede {
  color: var(--muted);
  font-size: clamp(1.15rem, 2.2vw, 1.4rem);
  font-weight: 400;
  line-height: 1.55;
  margin-top: 12px;
}

.article-breakout-image {
  border: 1px solid var(--line);
  box-shadow: var(--shadow-subtle);
  margin: 40px 0;
  max-width: 100%;
  padding: 8px;
}

.article-breakout-image img {
  aspect-ratio: 16 / 9;
  display: block;
  object-fit: cover;
  width: 100%;
}

.article-image-caption {
  color: var(--muted);
  font-family: var(--font-serif);
  font-size: 0.88rem;
  font-style: italic;
  margin-top: 12px;
  text-align: center;
}

.article-body {
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 1.15rem; /* Large, comfortable warm editorial reading size */
  line-height: 1.75;
}

.article-body p {
  margin-bottom: 24px;
}

/* Beautiful drop-cap for editorial layout */
.drop-cap {
  color: var(--forest);
  float: left;
  font-family: var(--font-serif);
  font-size: 4.8rem;
  font-weight: 800;
  line-height: 0.8;
  margin-right: 12px;
  margin-top: 4px;
}

.article-body h2,
.article-body h3 {
  font-family: var(--font-serif);
  font-weight: 800;
  line-height: 1.2;
  margin: 48px 0 20px;
}

.article-body h2 {
  border-bottom: 1px solid var(--line);
  font-size: 1.8rem;
  padding-bottom: 8px;
}

.article-body h3 {
  font-size: 1.45rem;
}

.article-body ul {
  list-style-type: none;
  margin-bottom: 28px;
  padding-left: 12px;
}

.article-body ul li {
  margin-bottom: 10px;
  position: relative;
}

.article-body ul li::before {
  color: var(--clay);
  content: "■";
  font-size: 0.65rem;
  left: -20px;
  position: absolute;
  top: 2px;
}

.pull-quote {
  border-left: 4px solid var(--clay);
  color: var(--forest);
  font-family: var(--font-serif);
  font-size: 1.48rem;
  font-style: italic;
  line-height: 1.5;
  margin: 40px 0;
  padding-left: 24px;
}

.source-link-footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.88rem;
  margin-top: 56px;
  padding-top: 24px;
  text-align: center;
}

.source-link-footer a {
  color: var(--clay);
  font-weight: 700;
}

.source-link-footer a:hover {
  text-decoration: underline;
}

/* -----------------------------------------------------
   Physics Research & Family Placeholder Styling
----------------------------------------------------- */

.research-matrix-layout {
  display: grid;
  gap: 40px;
  grid-template-columns: 1fr;
}

.research-matrix-table {
  border-collapse: collapse;
  font-size: 0.95rem;
  margin-top: 16px;
  width: 100%;
}

.research-matrix-table th,
.research-matrix-table td {
  border-bottom: 1px solid var(--line);
  padding: 16px;
  text-align: left;
}

.research-matrix-table th {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
}

.research-matrix-table tr:hover td {
  background-color: var(--sky);
}

.status-badge {
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 800;
  padding: 4px 8px;
  text-transform: uppercase;
}

.status-badge.active {
  background-color: var(--sky);
  color: var(--forest);
}

.status-badge.archived {
  background-color: var(--line);
  color: var(--muted);
}

/* -----------------------------------------------------
   Footer
----------------------------------------------------- */

.site-footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.85rem;
  margin-top: 80px;
}

.site-footer-container {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin: 0 auto;
  max-width: var(--max-width);
  padding: 40px 24px;
  text-align: center;
}

.site-footer-meta {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  justify-content: center;
}

.site-footer-meta span {
  font-family: var(--font-mono);
}

/* -----------------------------------------------------
   Responsive Media Queries
----------------------------------------------------- */

@media (max-width: 960px) {
  .hero-cover {
    grid-template-columns: 1fr;
  }
  
  .editorial-pillars-grid {
    grid-template-columns: 1fr;
  }
  
  .archive-layout {
    grid-template-columns: 1fr;
  }
  
  .filter-sidebar {
    position: static;
  }
}

@media (max-width: 600px) {
  .site-header-container {
    flex-direction: column;
    gap: 16px;
  }
  
  .article-card.horizontal {
    grid-template-columns: 1fr;
  }
  
  .reading-header {
    padding-bottom: 24px;
  }
  
  .site-footer-container {
    padding: 32px 16px;
  }
}