/* ============================================
   NoF 2024 Best Paper Award — Official Site
   Dark Tech / Magazine Feature Design
   ============================================
   Uses dark tech colors (same family as before)
   but completely different LAYOUT from RNDM.
   RNDM = two-column grid (main + sidebar).
   NoF  = full-width feature magazine / card-vertical
   ============================================ */

/* --- Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@300;400;500;600;700&family=Inter:wght@300;400;500;600&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  /* Colors — dark slate palette (softer than pure black) */
  --bg-dark:      #171b26;
  --bg-card:      #1e2433;
  --bg-card-hover:#252c3d;
  --bg-elevated:  #2d3548;
  --accent-purple:#7c3aed;
  --accent-cyan:  #06b6d4;
  --accent-pink:  #ec4899;
  --accent-glow:  rgba(124, 58, 237, 0.3);
  --text-primary: #e2e8f0;
  --text-secondary:#94a3b8;
  --text-muted:   #64748b;
  --border-color: rgba(124, 58, 237, 0.15);
  --border-light: rgba(148, 163, 184, 0.1);

  /* Typography */
  --font-display: 'Space Grotesk', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-sans:    'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono:    'JetBrains Mono', 'SF Mono', monospace;

  /* Spacing */
  --space-sm:  8px;
  --space-md:  16px;
  --space-lg:  24px;
  --space-xl:  32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  --space-4xl: 80px;

  /* Radii */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 20px;

  /* Shadows */
  --shadow-card:  0 4px 24px rgba(0,0,0,0.4);
  --shadow-glow:  0 0 30px var(--accent-glow);
}

/* ----- Reset ----- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body {
  font-family: var(--font-sans);
  color: var(--text-primary);
  background: var(--bg-dark);
  line-height: 1.6;
}

a { color: var(--accent-cyan); text-decoration: none; transition: color 0.2s ease; }
a:hover { color: var(--accent-pink); }

img { max-width: 100%; display: block; }
ul, ol { list-style: none; }

/* ----- Container ----- */
.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.container-narrow {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* ============================================
   HEADER — minimal left-aligned
   Different from RNDM's centered/nav layout
   ============================================ */
.site-header {
  background: rgba(23, 27, 38, 0.95);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.site-title a {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.site-title .tag {
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.6rem;
  font-weight: 400;
  margin-left: 8px;
  padding: 2px 8px;
  border: 1px solid var(--border-color);
  border-radius: 100px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.menu-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 1.3rem;
  padding: 6px 12px;
  border-radius: var(--radius-md);
  cursor: pointer;
}

.main-nav { display: flex; gap: 2px; }
.main-nav a {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-muted);
  padding: 8px 14px;
  border-radius: var(--radius-md);
  transition: all 0.2s ease;
}
.main-nav a:hover, .main-nav a.active {
  color: var(--text-primary);
  background: rgba(124, 58, 237, 0.1);
}
.main-nav a.active {
  color: var(--accent-purple);
}

/* ============================================
   HERO — large, bold, left-aligned
   Different from RNDM's centered hero
   ============================================ */
.hero {
  padding: var(--space-4xl) 0 var(--space-2xl);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -400px;
  right: -200px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(124, 58, 237, 0.06) 0%, transparent 70%);
  pointer-events: none;
}

.hero-inner {
  max-width: 800px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--accent-purple);
  margin-bottom: var(--space-lg);
  padding: 4px 14px;
  border: 1px solid rgba(124, 58, 237, 0.2);
  border-radius: 100px;
  background: rgba(124, 58, 237, 0.06);
}

.hero h1 {
  font-family: var(--font-display);
  font-size: 3.8rem;
  font-weight: 700;
  line-height: 1.0;
  letter-spacing: -0.04em;
  margin-bottom: var(--space-lg);
}

.hero h1 .accent {
  background: linear-gradient(135deg, var(--accent-purple), var(--accent-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-meta {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: var(--space-xl);
}

.hero-meta strong {
  color: var(--text-secondary);
  font-weight: 500;
}

/* ============================================
   FEATURE BAR — stats/badge row
   ============================================ */
.feature-bar {
  display: flex;
  gap: var(--space-xl);
  padding: var(--space-xl) 0;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  margin-bottom: var(--space-2xl);
}

.feat-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.feat-item .num {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--accent-cyan);
  line-height: 1;
}

.feat-item .label {
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* ============================================
   FULL-WIDTH FEATURE SECTION
   ============================================ */
.feature-section {
  padding: var(--space-3xl) 0;
}

.feature-section .section-label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--accent-purple);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-md);
  display: flex;
  align-items: center;
  gap: 8px;
}

.feature-section .section-label::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border-color);
}

.feature-section h2 {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-lg);
  line-height: 1.15;
}

.feature-section h2 .sub {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 6px;
}

/* ============================================
   AWARD CARDS — vertical stacked, decorative left border
   Different from RNDM's side-by-side cards
   ============================================ */
.award-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  margin-bottom: var(--space-lg);
  position: relative;
  transition: all 0.3s ease;
}

.award-card::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 4px;
  background: linear-gradient(180deg, var(--accent-purple), var(--accent-cyan));
  border-radius: var(--radius-lg) 0 0 var(--radius-lg);
}

.award-card:hover {
  border-color: rgba(124, 58, 237, 0.3);
  box-shadow: var(--shadow-glow);
}

.award-card .card-tag {
  display: inline-block;
  background: linear-gradient(135deg, var(--accent-purple), var(--accent-pink));
  color: white;
  padding: 3px 12px;
  border-radius: 100px;
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-md);
}

.award-card h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-md);
  line-height: 1.35;
}

.award-card .meta-row {
  display: flex;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-bottom: 4px;
}

.award-card .meta-row .strong {
  color: var(--accent-cyan);
  font-weight: 500;
  min-width: 80px;
  flex-shrink: 0;
}

.award-card .btn-ghost {
  display: inline-block;
  margin-top: var(--space-md);
  padding: 7px 20px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all 0.2s ease;
}

.award-card .btn-ghost:hover {
  background: linear-gradient(135deg, var(--accent-purple), var(--accent-pink));
  color: white;
  border-color: transparent;
}

/* ============================================
   INFO GRID — for metadata displays
   ============================================ */
.info-grid {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
}

.info-grid .cell {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border-light);
  border-right: 1px solid var(--border-light);
}

.info-grid .cell:nth-child(2n) {
  border-right: none;
}

.info-grid .cell:nth-last-child(-n+2) {
  border-bottom: none;
}

.info-grid .cell-label {
  font-size: 0.65rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 4px;
}

.info-grid .cell-value {
  font-size: 0.85rem;
  color: var(--text-primary);
}

/* ============================================
   HIGHLIGHT STATS — full-width banner
   ============================================ */
.stats-banner {
  background: linear-gradient(135deg, rgba(124, 58, 237, 0.06), rgba(6, 182, 212, 0.03));
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl);
  margin: var(--space-2xl) 0;
}

.stats-banner h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  margin-bottom: var(--space-lg);
}

.stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
}

.stat-card {
  background: rgba(6, 182, 212, 0.04);
  border: 1px solid rgba(6, 182, 212, 0.1);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
}

.stat-card .stat-icon {
  font-size: 1.2rem;
  margin-bottom: var(--space-sm);
}

.stat-card .stat-num {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--accent-cyan);
}

.stat-card .stat-desc {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* ============================================
   QUOTE BLOCK
   ============================================ */
.quote-block {
  margin: var(--space-2xl) 0;
  padding: var(--space-xl);
  border-left: 3px solid var(--accent-purple);
  background: linear-gradient(135deg, rgba(124, 58, 237, 0.04), transparent);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.quote-block p {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-style: italic;
  color: var(--text-secondary);
  line-height: 1.5;
}

.quote-block .attribution {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-style: normal;
  color: var(--text-muted);
  margin-top: var(--space-md);
}

/* ============================================
   PAGE SECTION (interior pages)
   ============================================ */
.page-section {
  padding: var(--space-3xl) 0;
}

.page-section h1 {
  font-family: var(--font-display);
  font-size: 2.8rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-lg);
  line-height: 1.05;
}

.page-section .lead {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-xl);
  max-width: 700px;
}

.page-section h2 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: var(--space-2xl) 0 var(--space-md);
}

.page-section h3 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin: var(--space-xl) 0 var(--space-sm);
}

.page-section p {
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
  line-height: 1.8;
}

.page-section ul, .page-section ol {
  margin: 0 0 var(--space-md) 20px;
  color: var(--text-secondary);
}

.page-section li {
  margin-bottom: 6px;
}

/* ============================================
   BREADCRUMB
   ============================================ */
.breadcrumb {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: var(--space-xl);
  font-family: var(--font-mono);
}
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--accent-cyan); }
.breadcrumb .sep { margin: 0 8px; color: var(--border-color); }
.breadcrumb .current { color: var(--text-secondary); }

/* ============================================
   NEWS ARTICLE
   ============================================ */
.article-header {
  margin-bottom: var(--space-2xl);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--border-color);
}

.article-header .article-date {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-purple);
  margin-bottom: var(--space-sm);
}

.article-header h1 {
  font-family: var(--font-display);
  font-size: 2.2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.article-body { line-height: 1.9; color: var(--text-secondary); }
.article-body p { margin-bottom: var(--space-md); }
.article-body h2 {
  font-family: var(--font-display);
  font-size: 1.3rem;
  color: var(--text-primary);
  margin: var(--space-2xl) 0 var(--space-md);
}
.article-body h3 {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent-cyan);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin: var(--space-xl) 0 var(--space-sm);
}

/* ============================================
   PAPER DETAILS PANEL
   ============================================ */
.paper-panel {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin: var(--space-xl) 0;
}

.paper-panel-header {
  background: linear-gradient(135deg, rgba(124, 58, 237, 0.08), rgba(6, 182, 212, 0.04));
  padding: var(--space-lg);
  border-bottom: 1px solid var(--border-color);
}

.paper-panel-header h3 {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
}

.paper-panel-body {
  padding: var(--space-lg);
}

.paper-panel-body .row {
  display: flex;
  padding: 10px 0;
  border-bottom: 1px solid var(--border-light);
}

.paper-panel-body .row:last-child {
  border-bottom: none;
}

.paper-panel-body .row-label {
  flex: 0 0 120px;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.paper-panel-body .row-value {
  flex: 1;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* ============================================
   HISTORY TABLE
   ============================================ */
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
}

.history-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
  background: var(--bg-card);
}

.history-table thead {
  background: var(--bg-elevated);
}

.history-table th {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 14px 16px;
  text-align: left;
}

.history-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-light);
  color: var(--text-secondary);
}

.history-table tbody tr:hover td {
  background: rgba(124, 58, 237, 0.04);
}

.history-table .highlight-row td {
  background: rgba(124, 58, 237, 0.06);
  color: var(--text-primary);
  font-weight: 500;
}

/* ============================================
   FOOTER — minimal, small
   ============================================ */
.site-footer {
  border-top: 1px solid var(--border-color);
  padding: var(--space-2xl) 0;
  text-align: center;
}

.site-footer p {
  color: var(--text-muted);
  font-size: 0.75rem;
  margin-bottom: 4px;
}

.site-footer a { color: var(--text-muted); }
.site-footer a:hover { color: var(--accent-cyan); }

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 860px) {
  .hero h1 { font-size: 2.4rem; }
  .feature-bar { flex-wrap: wrap; gap: var(--space-md); }
  .info-grid { grid-template-columns: 1fr; }
  .info-grid .cell:nth-child(2n) { border-right: none; }
  .info-grid .cell:nth-last-child(-n+2) { border-bottom: 1px solid var(--border-light); }
  .info-grid .cell:last-child { border-bottom: none; }
  .stats-grid { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .menu-toggle { display: block; }
  .main-nav {
    display: none;
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background: rgba(23, 27, 38, 0.98);
    flex-direction: column;
    padding: var(--space-md);
    border-bottom: 1px solid var(--border-color);
  }
  .main-nav.open { display: flex; }
  .main-nav a { padding: 12px 16px; }
  .hero h1 { font-size: 1.8rem; }
  .page-section h1 { font-size: 1.8rem; }
}