/* ============================================================
   Journal of AI Ethics — styles.css  (v2 — modern redesign)
   ============================================================ */

/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:ital,wght@0,300;0,400;0,500;0,600;0,700;0,800;1,400&family=Lora:ital,wght@0,400;0,500;0,600;1,400;1,500&family=JetBrains+Mono:ital,wght@0,300;0,400;0,500;1,300&display=swap');

/* --- Design Tokens --- */
:root {
  /* Palette — Light */
  --bg:            #F8FAFC;
  --bg-card:       #FFFFFF;
  --bg-surface:    #F1F5F9;
  --bg-surface2:   #E8EEF7;
  --bg-abstract:   #EFF6FF;
  --bg-code:       #F1F5F9;
  --text:          #0F172A;
  --text-muted:    #475569;
  --text-faint:    #94A3B8;
  --border:        #E2E8F0;
  --border-light:  #F0F4F8;

  /* Brand */
  --accent:        #2563EB;
  --accent-dark:   #1D4ED8;
  --accent-2:      #7C3AED;
  --accent-light:  #EFF6FF;
  --gradient:      linear-gradient(135deg, #2563EB 0%, #7C3AED 100%);
  --gradient-text: linear-gradient(135deg, #2563EB 0%, #7C3AED 100%);

  /* Hero */
  --hero-bg-1: #060C1F;
  --hero-bg-2: #0D1B3E;

  /* Tags */
  --tag-ethics:           #92400E;
  --tag-ethics-bg:        #FEF3C7;
  --tag-security:         #1E40AF;
  --tag-security-bg:      #DBEAFE;
  --tag-alignment:        #5B21B6;
  --tag-alignment-bg:     #EDE9FE;
  --tag-industry:         #065F46;
  --tag-industry-bg:      #D1FAE5;
  --tag-interp:           #14532D;
  --tag-interp-bg:        #DCFCE7;
  --tag-policy:           #881337;
  --tag-policy-bg:        #FFE4E6;

  /* Shadows */
  --shadow-sm:   0 1px 3px rgba(15,23,42,0.06), 0 1px 2px rgba(15,23,42,0.04);
  --shadow-md:   0 4px 14px rgba(15,23,42,0.09), 0 2px 4px rgba(15,23,42,0.04);
  --shadow-lg:   0 10px 30px rgba(15,23,42,0.11), 0 4px 10px rgba(15,23,42,0.05);

  /* Layout */
  --sidebar-left:  220px;
  --sidebar-right: 200px;
  --gap:           1.75rem;
  --content-max:   720px;
  --radius-sm:     4px;
  --radius:        8px;
  --radius-lg:     12px;

  /* Typography */
  --font-ui:    'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  --font-serif: 'Lora', Georgia, 'Times New Roman', serif;
  --font-mono:  'JetBrains Mono', 'Fira Code', 'Courier New', monospace;
}

[data-theme="dark"] {
  --bg:            #06080F;
  --bg-card:       #0D1526;
  --bg-surface:    #111D35;
  --bg-surface2:   #162040;
  --bg-abstract:   #0F1E3A;
  --bg-code:       #111D35;
  --text:          #F1F5F9;
  --text-muted:    #94A3B8;
  --text-faint:    #475569;
  --border:        #1E2D4A;
  --border-light:  #172038;

  --accent:        #3B82F6;
  --accent-dark:   #60A5FA;
  --accent-2:      #8B5CF6;
  --accent-light:  #0F1E3A;
  --gradient:      linear-gradient(135deg, #3B82F6 0%, #8B5CF6 100%);
  --gradient-text: linear-gradient(135deg, #60A5FA 0%, #A78BFA 100%);

  --hero-bg-1: #03050F;
  --hero-bg-2: #070E25;

  --tag-ethics:           #FCD34D;
  --tag-ethics-bg:        #451A03;
  --tag-security:         #93C5FD;
  --tag-security-bg:      #1E3A5F;
  --tag-alignment:        #C4B5FD;
  --tag-alignment-bg:     #2E1065;
  --tag-industry:         #6EE7B7;
  --tag-industry-bg:      #064E3B;
  --tag-interp:           #86EFAC;
  --tag-interp-bg:        #052E16;
  --tag-policy:           #FDA4AF;
  --tag-policy-bg:        #4C0519;

  --shadow-sm:   0 1px 3px rgba(0,0,0,0.3);
  --shadow-md:   0 4px 14px rgba(0,0,0,0.38);
  --shadow-lg:   0 10px 30px rgba(0,0,0,0.44);
}

/* --- Reset & Base --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-ui);
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.65;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color 0.2s ease, color 0.2s ease;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ============================================================
   TOP NAVIGATION
   ============================================================ */
.top-nav {
  position: sticky;
  top: 0;
  z-index: 200;
  height: 60px;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  padding: 0 1.5rem;
  gap: 0.75rem;
}

.top-nav__brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  flex-shrink: 0;
}
.top-nav__brand:hover { text-decoration: none; }

.brand-logo {
  width: 30px;
  height: 30px;
  object-fit: contain;
  display: block;
  flex-shrink: 0;
}
[data-theme="dark"] .brand-logo {
  filter: invert(1);
}

.brand-wordmark {
  font-family: var(--font-ui);
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1.25;
  letter-spacing: -0.01em;
}
.brand-wordmark em {
  font-style: normal;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.top-nav__spacer { flex: 1; }

.top-nav__links {
  display: flex;
  gap: 0.15rem;
  align-items: center;
}
.top-nav__links a {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-muted);
  padding: 0.38rem 0.7rem;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: color 0.15s, background 0.15s;
}
.top-nav__links a:hover { color: var(--text); background: var(--bg-surface); text-decoration: none; }
.top-nav__links a.active { color: var(--accent); background: var(--accent-light); }

.btn-theme {
  font-family: var(--font-mono);
  font-size: 0.67rem;
  color: var(--text-muted);
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.35rem 0.7rem;
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
  letter-spacing: 0.02em;
}
.btn-theme:hover { color: var(--accent); border-color: var(--accent); background: var(--accent-light); }

.btn-hamburger {
  display: none;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.38rem 0.6rem;
  cursor: pointer;
  color: var(--text-muted);
  font-size: 1rem;
  line-height: 1;
  align-items: center;
}
.btn-hamburger:hover { color: var(--accent); }

/* ============================================================
   PAGE LAYOUT
   ============================================================ */
.site-wrapper {
  max-width: 1260px;
  margin: 0 auto;
  padding: 0 1.25rem;
  width: 100%;
}

.page-layout {
  display: grid;
  grid-template-columns: var(--sidebar-left) 1fr var(--sidebar-right);
  grid-template-areas: "left-sidebar main right-sidebar";
  gap: var(--gap);
  padding: 1.75rem 0 4rem;
  align-items: start;
}

/* ============================================================
   LEFT SIDEBAR
   ============================================================ */
.left-sidebar {
  grid-area: left-sidebar;
  position: sticky;
  top: 76px;
  max-height: calc(100vh - 84px);
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

.sidebar-journal-name {
  font-family: var(--font-ui);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
  display: block;
  margin-bottom: 0.25rem;
  line-height: 1.35;
  letter-spacing: -0.01em;
}
.sidebar-journal-name em {
  font-style: normal;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.sidebar-journal-name:hover { opacity: 0.8; text-decoration: none; }

.sidebar-sub {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  color: var(--text-faint);
  letter-spacing: 0.04em;
  margin-bottom: 1.1rem;
  display: block;
}

.sidebar-nav { list-style: none; margin-bottom: 1rem; }
.sidebar-nav li + li { margin-top: 2px; }
.sidebar-nav a {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
  padding: 0.4rem 0.6rem;
  border-radius: var(--radius-sm);
  transition: all 0.15s;
}
.sidebar-nav a:hover { background: var(--bg-surface); color: var(--text); text-decoration: none; }
.sidebar-nav a.active { background: var(--accent-light); color: var(--accent); }
.nav-icon { font-size: 0.9rem; opacity: 0.7; }

.sidebar-divider { border: none; border-top: 1px solid var(--border); margin: 1rem 0; }

.sidebar-section-title {
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 0.55rem;
}

.topic-tags { display: flex; flex-wrap: wrap; gap: 0.35rem; margin-bottom: 0.5rem; }
.tag-btn {
  font-family: var(--font-ui);
  font-size: 0.68rem;
  font-weight: 500;
  padding: 0.22rem 0.55rem;
  border-radius: 20px;
  cursor: pointer;
  background: var(--bg-surface);
  color: var(--text-muted);
  border: 1px solid var(--border);
  transition: all 0.15s;
  white-space: nowrap;
}
.tag-btn:hover { background: var(--bg-surface2); color: var(--text); }
.tag-btn.active { background: var(--accent-light); color: var(--accent); border-color: var(--accent); }

.archive-list { list-style: none; }
.archive-list__vol {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.25rem 0;
}
.archive-list__vol:hover { color: var(--accent); }
.archive-list__issues {
  list-style: none;
  padding-left: 0.75rem;
  margin-top: 0.3rem;
  border-left: 2px solid var(--border);
}
.archive-list__issues a {
  font-size: 0.74rem;
  color: var(--text-faint);
  text-decoration: none;
  display: block;
  padding: 0.15rem 0.5rem;
}
.archive-list__issues a:hover { color: var(--accent); }

/* ============================================================
   MAIN CONTENT
   ============================================================ */
.main-content { grid-area: main; min-width: 0; }

/* ============================================================
   RIGHT SIDEBAR
   ============================================================ */
.right-sidebar {
  grid-area: right-sidebar;
  position: sticky;
  top: 76px;
  max-height: calc(100vh - 84px);
  overflow-y: auto;
  scrollbar-width: thin;
}

.sidebar-widget {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1rem 1.1rem;
  margin-bottom: 0.85rem;
  box-shadow: var(--shadow-sm);
}
.sidebar-widget__title {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 0.6rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}
.sidebar-widget p { font-size: 0.78rem; line-height: 1.6; color: var(--text-muted); margin-bottom: 0.35rem; }
.sidebar-widget a { color: var(--accent); font-size: 0.78rem; }

.issn-badge {
  font-family: var(--font-mono);
  font-size: 0.63rem;
  color: var(--text-faint);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.2rem 0.45rem;
  display: inline-block;
  margin-top: 0.25rem;
}

.widget-link {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.76rem;
  color: var(--text-muted);
  text-decoration: none;
  padding: 0.3rem 0;
  transition: color 0.15s;
}
.widget-link:hover { color: var(--accent); text-decoration: none; }

/* ============================================================
   HOMEPAGE HERO
   ============================================================ */
.hero {
  background: linear-gradient(145deg, #060C1F 0%, #0D1B3E 35%, #0B1535 65%, #050A1A 100%);
  position: relative;
  overflow: hidden;
  padding: 3.75rem 2rem 4rem;
}

.hero::before {
  content: '';
  position: absolute;
  width: 700px;
  height: 700px;
  background: radial-gradient(ellipse, rgba(37,99,235,0.14) 0%, transparent 65%);
  top: -180px;
  right: -50px;
  pointer-events: none;
}
.hero::after {
  content: '';
  position: absolute;
  width: 480px;
  height: 480px;
  background: radial-gradient(ellipse, rgba(124,58,237,0.11) 0%, transparent 65%);
  bottom: -80px;
  left: 18%;
  pointer-events: none;
}

.hero-logo-bg {
  position: absolute;
  right: 6%;
  top: 50%;
  transform: translateY(-50%);
  width: 300px;
  height: 300px;
  object-fit: contain;
  opacity: 0.055;
  filter: invert(1);
  pointer-events: none;
  user-select: none;
  z-index: 0;
}

.hero-grid-pattern {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(255,255,255,0.055) 1px, transparent 1px);
  background-size: 26px 26px;
  pointer-events: none;
}

.hero-inner {
  max-width: 680px;
  position: relative;
  z-index: 1;
}

.hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.67rem;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: rgba(147,197,253,0.78);
  margin-bottom: 1.25rem;
  background: rgba(37,99,235,0.12);
  border: 1px solid rgba(37,99,235,0.22);
  border-radius: 20px;
  padding: 0.28rem 0.75rem;
}
.hero-kicker-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #3B82F6;
  box-shadow: 0 0 8px #3B82F6;
  flex-shrink: 0;
}

.hero-title {
  font-family: var(--font-ui);
  font-size: clamp(1.85rem, 4.5vw, 3rem);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.03em;
  color: #F8FAFC;
  margin-bottom: 1.1rem;
}
.hero-title .gradient-word {
  background: linear-gradient(135deg, #60A5FA 0%, #A78BFA 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 1rem;
  color: rgba(203,213,225,0.82);
  line-height: 1.75;
  margin-bottom: 2rem;
  max-width: 540px;
  font-weight: 400;
}

.hero-actions { display: flex; gap: 0.75rem; flex-wrap: wrap; align-items: center; }

.hero-stats {
  display: flex;
  gap: 0;
  margin-top: 2.75rem;
  padding-top: 1.75rem;
  border-top: 1px solid rgba(255,255,255,0.08);
  flex-wrap: wrap;
}
.hero-stat {
  padding-right: 2rem;
  margin-right: 2rem;
  border-right: 1px solid rgba(255,255,255,0.1);
}
.hero-stat:last-child { border-right: none; margin-right: 0; }
.hero-stat__num {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  color: #F8FAFC;
  line-height: 1;
  margin-bottom: 0.2rem;
}
.hero-stat__label {
  font-size: 0.7rem;
  color: rgba(148,163,184,0.7);
  font-weight: 500;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--font-ui);
  font-size: 0.83rem;
  font-weight: 600;
  background: var(--gradient);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  padding: 0.6rem 1.25rem;
  cursor: pointer;
  text-decoration: none;
  transition: opacity 0.15s, transform 0.15s, box-shadow 0.15s;
  box-shadow: 0 2px 8px rgba(37,99,235,0.35);
  white-space: nowrap;
}
.btn-primary:hover {
  opacity: 0.9;
  transform: translateY(-1px);
  box-shadow: 0 5px 18px rgba(37,99,235,0.4);
  text-decoration: none;
  color: #fff;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--font-ui);
  font-size: 0.83rem;
  font-weight: 600;
  background: transparent;
  color: var(--accent);
  border: 1.5px solid var(--accent);
  border-radius: var(--radius);
  padding: 0.58rem 1.2rem;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.15s;
  position: relative;
  white-space: nowrap;
}
.btn-secondary:hover { background: var(--accent-light); text-decoration: none; }

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--font-ui);
  font-size: 0.83rem;
  font-weight: 600;
  background: rgba(255,255,255,0.08);
  color: rgba(255,255,255,0.9);
  border: 1.5px solid rgba(255,255,255,0.18);
  border-radius: var(--radius);
  padding: 0.58rem 1.2rem;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.15s;
  white-space: nowrap;
  backdrop-filter: blur(4px);
}
.btn-ghost:hover { background: rgba(255,255,255,0.15); color: #fff; text-decoration: none; }

.copy-confirm {
  position: absolute;
  top: -28px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--text);
  color: var(--bg);
  font-size: 0.62rem;
  padding: 0.22rem 0.55rem;
  border-radius: var(--radius-sm);
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s;
}
.copy-confirm.show { opacity: 1; }

/* ============================================================
   SECTION LABEL
   ============================================================ */
.section-label {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 1rem;
}
.section-label::after { content: ''; flex: 1; height: 1px; background: var(--border); }

.page-title {
  font-family: var(--font-ui);
  font-size: 1.65rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--text);
  margin-bottom: 0.35rem;
  line-height: 1.2;
}
.page-subtitle {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 1.75rem;
}

/* ============================================================
   PAPER CARDS
   ============================================================ */
.paper-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.35rem 1.35rem 1.1rem 1.2rem;
  margin-bottom: 1rem;
  border-left-width: 3px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.2s, transform 0.15s;
}
.paper-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }

.paper-card[data-primary-tag="LLM Security"]    { border-left-color: #1E40AF; }
.paper-card[data-primary-tag="AI Ethics"]        { border-left-color: #92400E; }
.paper-card[data-primary-tag="Alignment"]        { border-left-color: #5B21B6; }
.paper-card[data-primary-tag="AI in Industry"]   { border-left-color: #065F46; }
.paper-card[data-primary-tag="Interpretability"] { border-left-color: #14532D; }
.paper-card[data-primary-tag="AI Policy"]        { border-left-color: #881337; }

[data-theme="dark"] .paper-card[data-primary-tag="LLM Security"]    { border-left-color: #93C5FD; }
[data-theme="dark"] .paper-card[data-primary-tag="AI Ethics"]        { border-left-color: #FCD34D; }
[data-theme="dark"] .paper-card[data-primary-tag="Alignment"]        { border-left-color: #C4B5FD; }
[data-theme="dark"] .paper-card[data-primary-tag="AI in Industry"]   { border-left-color: #6EE7B7; }
[data-theme="dark"] .paper-card[data-primary-tag="Interpretability"] { border-left-color: #86EFAC; }
[data-theme="dark"] .paper-card[data-primary-tag="AI Policy"]        { border-left-color: #FDA4AF; }

.paper-card__ref {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  color: var(--text-faint);
  letter-spacing: 0.07em;
  margin-bottom: 0.4rem;
}
.paper-card__title {
  font-family: var(--font-ui);
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.35;
  margin-bottom: 0.4rem;
  letter-spacing: -0.015em;
}
.paper-card__title a { color: var(--text); text-decoration: none; }
.paper-card__title a:hover { color: var(--accent); }

.paper-card__byline {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 0.65rem;
}
.paper-card__byline span + span::before { content: " · "; color: var(--text-faint); }

.paper-card__abstract {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 0.85rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.paper-card__tags { display: flex; flex-wrap: wrap; gap: 0.35rem; margin-bottom: 0.85rem; }
.paper-card__footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 0.7rem;
  border-top: 1px solid var(--border);
}
.paper-card__read {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.3rem;
  transition: gap 0.15s;
}
.paper-card__read:hover { gap: 0.5rem; text-decoration: none; }
.paper-card__pdf {
  font-family: var(--font-mono);
  font-size: 0.63rem;
  color: var(--text-faint);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.3rem;
  transition: color 0.15s;
  letter-spacing: 0.02em;
}
.paper-card__pdf:hover { color: var(--accent); text-decoration: none; }

/* ============================================================
   TAG PILLS
   ============================================================ */
.tag-pill {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-ui);
  font-size: 0.65rem;
  font-weight: 600;
  padding: 0.2rem 0.55rem;
  border-radius: 20px;
  white-space: nowrap;
  letter-spacing: 0.02em;
}
.tag-pill--ethics           { color: var(--tag-ethics);    background: var(--tag-ethics-bg); }
.tag-pill--llm-security     { color: var(--tag-security);  background: var(--tag-security-bg); }
.tag-pill--alignment        { color: var(--tag-alignment); background: var(--tag-alignment-bg); }
.tag-pill--ai-in-industry   { color: var(--tag-industry);  background: var(--tag-industry-bg); }
.tag-pill--interpretability { color: var(--tag-interp);    background: var(--tag-interp-bg); }
.tag-pill--ai-policy        { color: var(--tag-policy);    background: var(--tag-policy-bg); }

/* ============================================================
   TABS
   ============================================================ */
.tabs { display: flex; gap: 0; border-bottom: 2px solid var(--border); margin-bottom: 1.5rem; }
.tab-btn {
  font-family: var(--font-ui);
  font-size: 0.83rem;
  font-weight: 600;
  color: var(--text-muted);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  padding: 0.6rem 1rem;
  margin-bottom: -2px;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
}
.tab-btn:hover { color: var(--text); }
.tab-btn.active { color: var(--accent); border-bottom-color: var(--accent); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ============================================================
   PAPERS LISTING
   ============================================================ */
.papers-controls { display: flex; flex-wrap: wrap; gap: 0.65rem; align-items: center; margin-bottom: 1.25rem; }
.search-wrapper { flex: 1; min-width: 220px; position: relative; }
.search-icon { position: absolute; left: 0.75rem; top: 50%; transform: translateY(-50%); color: var(--text-faint); pointer-events: none; }
.search-input {
  width: 100%;
  font-family: var(--font-ui);
  font-size: 0.83rem;
  background: var(--bg-card);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 0.55rem 0.75rem 0.55rem 2.25rem;
  color: var(--text);
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
  box-shadow: var(--shadow-sm);
}
.search-input::placeholder { color: var(--text-faint); }
.search-input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(37,99,235,0.1); }
.sort-select {
  font-family: var(--font-ui);
  font-size: 0.8rem;
  font-weight: 500;
  background: var(--bg-card);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 0.55rem 0.75rem;
  color: var(--text-muted);
  cursor: pointer;
  outline: none;
  box-shadow: var(--shadow-sm);
}
.sort-select:focus { border-color: var(--accent); }
.filter-tags { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-bottom: 1.25rem; }

/* ============================================================
   PAPER PAGE
   ============================================================ */
.paper-page .main-content { max-width: var(--content-max); }
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: 0.67rem;
  color: var(--text-faint);
  margin-bottom: 1.5rem;
}
.breadcrumb a { color: var(--accent); }
.breadcrumb__sep { color: var(--border); }

.paper-header { margin-bottom: 1.75rem; }
.paper-ref {
  font-family: var(--font-mono);
  font-size: 0.67rem;
  letter-spacing: 0.08em;
  color: var(--text-faint);
  display: block;
  margin-bottom: 0.75rem;
}
.paper-title {
  font-family: var(--font-ui);
  font-size: clamp(1.5rem, 3.5vw, 2rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.025em;
  color: var(--text);
  margin-bottom: 1rem;
}
.paper-meta { font-size: 0.84rem; color: var(--text-muted); margin-bottom: 0.85rem; display: flex; flex-wrap: wrap; gap: 0; }
.paper-meta span + span::before { content: " | "; color: var(--text-faint); }
.paper-actions { display: flex; gap: 0.65rem; flex-wrap: wrap; margin-top: 1.1rem; }

/* Abstract */
.abstract-block {
  background: var(--bg-abstract);
  border: 1px solid rgba(37,99,235,0.14);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 1.25rem 1.4rem;
  margin-bottom: 2rem;
}
.abstract-label {
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.65rem;
  display: block;
}
.abstract-text { font-family: var(--font-serif); font-size: 0.9375rem; line-height: 1.8; color: var(--text-muted); font-style: italic; }
.keywords { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-top: 0.9rem; align-items: center; }
.keywords__label { font-size: 0.63rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; color: var(--text-faint); }
.keyword-pill { font-family: var(--font-mono); font-size: 0.61rem; background: var(--bg-surface); color: var(--text-muted); border-radius: var(--radius-sm); padding: 0.16rem 0.5rem; border: 1px solid var(--border); }

/* Paper Body */
.paper-body { font-family: var(--font-serif); font-size: 1.0625rem; line-height: 1.9; color: var(--text); text-align: justify; hyphens: auto; max-width: var(--content-max); }
.paper-body p { margin-bottom: 1.1em; }
.paper-body p + p { text-indent: 1.5em; }
.paper-body p:first-child, .paper-body h2 + p, .paper-body h3 + p { text-indent: 0; }
.paper-body h2 { font-family: var(--font-ui); font-size: 1.15rem; font-weight: 700; letter-spacing: -0.015em; margin: 2.25rem 0 0.75rem; padding-top: 1.25rem; border-top: 1px solid var(--border); color: var(--text); }
.paper-body h3 { font-family: var(--font-ui); font-size: 0.97rem; font-weight: 700; margin: 1.5rem 0 0.5rem; color: var(--text); }
.paper-body blockquote { border-left: 3px solid var(--accent); padding: 0.5rem 1.1rem; color: var(--text-muted); font-style: italic; margin: 1.5rem 0; background: var(--bg-abstract); border-radius: 0 var(--radius-sm) var(--radius-sm) 0; }

figure { text-align: center; margin: 2rem 0; }
figcaption { font-style: italic; font-size: 0.8rem; color: var(--text-muted); margin-top: 0.5rem; }

.paper-body table { width: 100%; border-collapse: collapse; font-size: 0.84rem; margin: 1.5rem 0; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-sm); }
.paper-body th { background: var(--bg-surface); border-bottom: 2px solid var(--border); padding: 0.65rem 0.75rem; text-align: left; font-family: var(--font-ui); font-size: 0.79rem; font-weight: 700; color: var(--text); }
.paper-body td { border-bottom: 1px solid var(--border); padding: 0.55rem 0.75rem; vertical-align: top; background: var(--bg-card); font-family: var(--font-ui); font-size: 0.83rem; }

sup { font-size: 0.65em; vertical-align: super; line-height: 0; }
sup a { color: var(--accent); text-decoration: none; }
.footnotes-section { border-top: 1px solid var(--border); padding-top: 1.25rem; margin-top: 2.5rem; }
.footnotes-section ol { font-family: var(--font-ui); font-size: 0.8rem; color: var(--text-muted); padding-left: 1.25rem; line-height: 1.6; }
.footnotes-section li { margin-bottom: 0.4rem; }
.references-section { margin-top: 2.5rem; }
.references-section h2 { font-family: var(--font-ui); font-size: 1.05rem; font-weight: 700; margin-bottom: 1rem; padding-bottom: 0.5rem; border-bottom: 1px solid var(--border); }
.reference-list { list-style: none; counter-reset: ref; }
.reference-list li { display: flex; gap: 0.75rem; font-family: var(--font-ui); font-size: 0.8rem; color: var(--text-muted); line-height: 1.55; margin-bottom: 0.65rem; counter-increment: ref; }
.reference-list li::before { content: "[" counter(ref) "]"; font-family: var(--font-mono); font-size: 0.63rem; color: var(--text-faint); min-width: 2rem; padding-top: 0.1rem; flex-shrink: 0; }

/* Citation Box */
.citation-box { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 1.4rem; margin-top: 2.5rem; box-shadow: var(--shadow-sm); }
.citation-box__title { font-size: 0.82rem; font-weight: 700; color: var(--text); margin-bottom: 0.8rem; padding-bottom: 0.6rem; border-bottom: 1px solid var(--border); }
.citation-pre { font-family: var(--font-mono); font-size: 0.74rem; color: var(--text-muted); background: var(--bg-surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 0.9rem 1rem; white-space: pre-wrap; word-break: break-word; line-height: 1.65; margin-bottom: 0.75rem; }

/* Code blocks */
pre { background: var(--bg-surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 1rem 1.25rem; overflow-x: auto; margin: 1.25rem 0; font-family: var(--font-mono); font-size: 0.79rem; line-height: 1.65; color: var(--text); box-shadow: var(--shadow-sm); }
code { font-family: var(--font-mono); font-size: 0.82em; background: var(--bg-surface); padding: 0.1em 0.35em; border-radius: var(--radius-sm); color: var(--accent); border: 1px solid var(--border); }
pre code { background: none; padding: 0; font-size: inherit; color: inherit; border: none; }

/* ============================================================
   ABOUT PAGE
   ============================================================ */
.about-section { margin-bottom: 2.5rem; }
.about-section h2 { font-family: var(--font-ui); font-size: 1.1rem; font-weight: 700; letter-spacing: -0.015em; color: var(--text); margin-bottom: 0.9rem; padding-bottom: 0.5rem; border-bottom: 1px solid var(--border); }
.about-section p { font-size: 0.9375rem; line-height: 1.8; color: var(--text-muted); margin-bottom: 1em; }
.about-section a { color: var(--accent); }
.two-columns { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.column-panel { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 1.1rem 1.25rem; box-shadow: var(--shadow-sm); }
.column-panel h3 { font-size: 0.85rem; font-weight: 700; margin-bottom: 0.75rem; color: var(--text); }
.column-panel ul { list-style: none; font-size: 0.83rem; color: var(--text-muted); line-height: 1.6; }
.column-panel ul li { padding: 0.2rem 0 0.2rem 1.1rem; position: relative; }
.column-panel ul li::before { content: "✓"; position: absolute; left: 0; color: #16A34A; font-size: 0.72rem; }
.column-panel--reject ul li::before { content: "✗"; color: #DC2626; }
.editor-card { display: flex; gap: 1.25rem; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 1.25rem; margin-top: 0.75rem; box-shadow: var(--shadow-sm); }
.editor-avatar { width: 58px; height: 58px; border-radius: 50%; background: var(--gradient); display: flex; align-items: center; justify-content: center; font-size: 1.3rem; font-weight: 800; flex-shrink: 0; color: #fff; }
.editor-info h3 { font-size: 0.92rem; font-weight: 700; margin-bottom: 0.2rem; }
.editor-info .editor-title { font-family: var(--font-mono); font-size: 0.66rem; color: var(--text-faint); margin-bottom: 0.5rem; display: block; }
.editor-info p { font-size: 0.83rem; color: var(--text-muted); line-height: 1.6; }

/* ============================================================
   SUBMIT PAGE
   ============================================================ */
.submit-section { margin-bottom: 2.5rem; }
.submit-section h2 { font-family: var(--font-ui); font-size: 1.1rem; font-weight: 700; letter-spacing: -0.015em; color: var(--text); margin-bottom: 0.9rem; padding-bottom: 0.5rem; border-bottom: 1px solid var(--border); }
.steps-list { list-style: none; }
.steps-list li { display: flex; gap: 1.1rem; margin-bottom: 1.5rem; }
.step-num { width: 32px; height: 32px; border-radius: 50%; background: var(--gradient); display: flex; align-items: center; justify-content: center; font-size: 0.8rem; font-weight: 700; color: #fff; flex-shrink: 0; margin-top: 0.1rem; box-shadow: 0 2px 8px rgba(37,99,235,0.3); }
.step-body h3 { font-size: 0.95rem; font-weight: 700; margin-bottom: 0.35rem; }
.step-body p { font-size: 0.875rem; color: var(--text-muted); line-height: 1.65; }
.checklist-panel { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 1.4rem; box-shadow: var(--shadow-sm); }
.checklist-group { margin-bottom: 1.25rem; }
.checklist-group:last-child { margin-bottom: 0; }
.checklist-group h3 { font-size: 0.65rem; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: var(--text-faint); margin-bottom: 0.65rem; padding-bottom: 0.4rem; border-bottom: 1px solid var(--border); }
.checklist-item { display: flex; align-items: flex-start; gap: 0.65rem; margin-bottom: 0.45rem; font-size: 0.875rem; color: var(--text-muted); line-height: 1.5; }
.check-icon { width: 16px; height: 16px; border: 1.5px solid var(--border); border-radius: 4px; flex-shrink: 0; margin-top: 2px; background: var(--bg-surface); font-size: 0.55rem; color: var(--text-faint); display: flex; align-items: center; justify-content: center; }
.callout-amber { background: #FFFBEB; border: 1px solid #FCD34D; border-left: 3px solid #D97706; border-radius: var(--radius); padding: 1rem 1.25rem; font-size: 0.875rem; color: #78350F; line-height: 1.65; margin-top: 1.1rem; }
[data-theme="dark"] .callout-amber { background: #1C1505; border-color: #854D0E; border-left-color: #D97706; color: #FCD34D; }
.scope-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin-top: 0.75rem; }
.scope-panel { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 1rem 1.25rem; box-shadow: var(--shadow-sm); }
.scope-panel h3 { font-size: 0.68rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; margin-bottom: 0.65rem; }
.scope-panel--in h3 { color: #16A34A; }
.scope-panel--out h3 { color: #DC2626; }
[data-theme="dark"] .scope-panel--in h3 { color: var(--tag-industry); }
[data-theme="dark"] .scope-panel--out h3 { color: #FCA5A5; }
.scope-panel ul { list-style: none; font-size: 0.82rem; color: var(--text-muted); line-height: 1.55; }
.scope-panel ul li { padding: 0.2rem 0 0.2rem 1rem; position: relative; }
.scope-panel--in ul li::before  { content: "✓"; position: absolute; left: 0; color: #16A34A; font-size: 0.7rem; }
.scope-panel--out ul li::before { content: "✗"; position: absolute; left: 0; color: #DC2626; font-size: 0.7rem; }

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer { border-top: 1px solid var(--border); padding: 1.5rem 0; margin-top: auto; font-size: 0.72rem; color: var(--text-faint); }
.footer-inner { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 0.5rem; }
.footer-brand { display: flex; align-items: center; gap: 0.45rem; }
.footer-logo { width: 16px; height: 16px; object-fit: contain; opacity: 0.45; display: block; }
[data-theme="dark"] .footer-logo { filter: invert(1); }
.footer-links { display: flex; gap: 1.25rem; }
.site-footer a { color: var(--text-faint); text-decoration: none; }
.site-footer a:hover { color: var(--accent); }

/* ============================================================
   MISC
   ============================================================ */
.no-results { font-size: 0.85rem; color: var(--text-faint); padding: 2.5rem; text-align: center; border: 1.5px dashed var(--border); border-radius: var(--radius-lg); display: none; }
.no-results.show { display: block; }
.code-block-wrapper { margin: 1rem 0; }
.code-block-wrapper pre { margin: 0; }
.btn-download-template { margin-top: 0.75rem; }

/* ============================================================
   OVERLAY & RESPONSIVE
   ============================================================ */
.sidebar-overlay { display: none; position: fixed; inset: 60px 0 0; background: rgba(6,8,15,0.55); z-index: 180; backdrop-filter: blur(2px); }
.sidebar-overlay.open { display: block; }

@media (max-width: 960px) {
  .top-nav__links { display: none; }
  .page-layout { grid-template-columns: 1fr; grid-template-areas: "main" "right-sidebar"; }
  .left-sidebar { display: none; position: fixed; top: 60px; left: 0; width: 280px; max-height: calc(100vh - 60px); background: var(--bg-card); border-right: 1px solid var(--border); z-index: 190; padding: 1.25rem; overflow-y: auto; box-shadow: var(--shadow-lg); }
  .left-sidebar.open { display: block; }
  .right-sidebar { position: static; max-height: none; display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 0.75rem; }
  .right-sidebar .sidebar-widget { margin-bottom: 0; }
  .btn-hamburger { display: flex; }
  .two-columns, .scope-grid { grid-template-columns: 1fr; }
  .paper-actions { flex-direction: column; }
  .paper-actions .btn-primary, .paper-actions .btn-secondary { width: 100%; justify-content: center; }
}

@media (max-width: 600px) {
  .page-title { font-size: 1.35rem; }
  .hero-title { font-size: 1.65rem; }
  .hero { padding: 2.5rem 1.25rem 2.75rem; }
  .hero-stats { flex-wrap: wrap; gap: 1rem; }
  .hero-stat { border-right: none; padding-right: 0; margin-right: 0; }
  .right-sidebar { grid-template-columns: 1fr; }
  .papers-controls { flex-direction: column; }
  .search-wrapper { min-width: 100%; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn-primary, .hero-actions .btn-ghost { width: 100%; justify-content: center; }
  .editor-card { flex-direction: column; }
  .footer-inner { flex-direction: column; align-items: flex-start; gap: 0.75rem; }
}