/* ==========================================================================
   Research Hub & Paper Pages – Shared Styles
   Consistent with MFNIV dark-theme portfolio
   ========================================================================== */

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

body {
  font-family: 'Poppins', sans-serif;
  background-color: #0a0a0f;
  color: #EAEAEA;
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
}

a {
  color: #00A8FF;
  text-decoration: none;
  transition: color 0.3s ease;
}

a:hover {
  color: #3dbfff;
}

/* --- Ambient Background --- */
.ambient-glow {
  position: fixed;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.08;
  pointer-events: none;
  z-index: 0;
}

.ambient-glow.glow-1 {
  width: 600px;
  height: 600px;
  background: #00A8FF;
  top: -200px;
  right: -100px;
  animation: drift1 20s ease-in-out infinite;
}

.ambient-glow.glow-2 {
  width: 500px;
  height: 500px;
  background: #00A8FF;
  bottom: -150px;
  left: -100px;
  animation: drift2 25s ease-in-out infinite;
}

@keyframes drift1 {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(-60px, 40px); }
}

@keyframes drift2 {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(40px, -60px); }
}

/* --- Stars / Particles --- */
.stars {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
}

.star {
  position: absolute;
  width: 1px;
  height: 1px;
  background: rgba(0, 168, 255, 0.5);
  border-radius: 50%;
  animation: twinkle var(--duration) ease-in-out infinite;
  animation-delay: var(--delay);
}

@keyframes twinkle {
  0%, 100% { opacity: 0; }
  50% { opacity: 1; }
}

/* --- Back Link --- */
.back-link {
  position: absolute;
  top: 28px;
  left: 32px;
  z-index: 10;
  color: #4a5a6a;
  text-decoration: none;
  font-family: 'Poppins', sans-serif;
  font-size: 0.85rem;
  font-weight: 400;
  letter-spacing: 1px;
  transition: color 0.3s ease;
  animation: fadeIn 1s ease-out;
}

.back-link:hover {
  color: #00A8FF;
}

/* --- Animations --- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* --- Footer --- */
.site-footer {
  margin-top: 60px;
  padding-top: 20px;
  text-align: center;
  animation: fadeIn 1.5s ease-out 0.8s both;
}

.site-footer p {
  font-size: 0.7rem;
  color: #2a3a4a;
  letter-spacing: 2px;
}

/* ==========================================================================
   HUB PAGE  –  /research/index.html
   ========================================================================== */

/* --- Hub Layout --- */
.hub-wrapper {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100vh;
  padding: 60px 20px 40px;
}

.hub-container {
  max-width: 960px;
  width: 100%;
  text-align: center;
}

/* --- Hub Header --- */
.hub-title {
  font-family: 'Cinzel', serif;
  font-size: 2.8rem;
  font-weight: 700;
  letter-spacing: 6px;
  color: #FFFFFF;
  margin-bottom: 8px;
  animation: fadeInUp 1s ease-out;
}

.hub-title .accent {
  color: #00A8FF;
  text-shadow: 0 0 30px rgba(0, 168, 255, 0.4),
               0 0 60px rgba(0, 168, 255, 0.15);
}

.hub-subtitle {
  font-family: 'Cinzel', serif;
  font-size: 0.85rem;
  font-weight: 400;
  color: #5a6a7a;
  letter-spacing: 5px;
  text-transform: uppercase;
  margin-top: 12px;
  margin-bottom: 16px;
  animation: fadeInUp 1s ease-out 0.2s both;
}

.divider {
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0, 168, 255, 0.2), transparent);
  margin: 0 0 48px;
  animation: fadeIn 1.5s ease-out 0.4s both;
}

/* --- Paper Card Grid --- */
.paper-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  animation: fadeInUp 1s ease-out 0.5s both;
}

.paper-card {
  display: block;
  padding: 28px 24px;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(0, 168, 255, 0.08);
  border-radius: 8px;
  text-decoration: none;
  color: #EAEAEA;
  transition: all 0.4s ease;
  position: relative;
  overflow: hidden;
  text-align: left;
}

.paper-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0, 168, 255, 0.3), transparent);
  opacity: 0;
  transition: opacity 0.4s ease;
}

.paper-card:hover {
  background: rgba(0, 168, 255, 0.04);
  border-color: rgba(0, 168, 255, 0.2);
  transform: translateY(-3px);
}

.paper-card:hover::before {
  opacity: 1;
}

.paper-card-title {
  font-family: 'Cinzel', serif;
  font-size: 1.05rem;
  font-weight: 700;
  color: #FFFFFF;
  letter-spacing: 2px;
  margin-bottom: 10px;
}

.paper-card-title .title-accent {
  color: #00A8FF;
}

.paper-card-blurb {
  font-size: 0.85rem;
  font-weight: 300;
  color: #8a9aaa;
  line-height: 1.7;
  margin-bottom: 14px;
}

.paper-card-date {
  font-size: 0.7rem;
  color: #5a6a7a;
  margin-bottom: 10px;
}

/* --- Shared Tag / Badge Styles --- */
.tag {
  display: inline-block;
  padding: 4px 12px;
  font-size: 0.65rem;
  font-weight: 400;
  letter-spacing: 2px;
  text-transform: uppercase;
  border-radius: 20px;
  margin-right: 6px;
  margin-bottom: 4px;
}

.tag-draft {
  color: #ffaa00;
  border: 1px solid rgba(255, 170, 0, 0.25);
  background: rgba(255, 170, 0, 0.08);
}

.tag-live {
  color: #00ffaa;
  border: 1px solid rgba(0, 255, 170, 0.25);
  background: rgba(0, 255, 170, 0.08);
}

.tag-soon {
  color: #5a6a7a;
  border: 1px solid rgba(90, 106, 122, 0.2);
  background: rgba(90, 106, 122, 0.06);
}

.tag-topic {
  color: #00A8FF;
  border: 1px solid rgba(0, 168, 255, 0.2);
  background: rgba(0, 168, 255, 0.06);
}

/* ==========================================================================
   PAPER PAGE  –  /research/<slug>/index.html
   ========================================================================== */

/* --- Paper Layout (sidebar + content) --- */
.paper-layout {
  position: relative;
  z-index: 1;
  display: flex;
  min-height: 100vh;
  padding-top: 60px;
}

/* --- Sidebar --- */
.paper-sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: 260px;
  height: 100vh;
  padding: 80px 24px 40px;
  background: rgba(10, 10, 15, 0.95);
  border-right: 1px solid rgba(0, 168, 255, 0.08);
  overflow-y: auto;
  z-index: 20;
  transition: transform 0.3s ease;
}

.sidebar-title {
  font-family: 'Cinzel', serif;
  font-size: 0.75rem;
  font-weight: 700;
  color: #5a6a7a;
  letter-spacing: 3px;
  text-transform: uppercase;
  margin-bottom: 24px;
}

.sidebar-nav {
  list-style: none;
}

.sidebar-nav li {
  margin-bottom: 4px;
}

.sidebar-nav a {
  display: block;
  padding: 8px 12px;
  font-size: 0.82rem;
  font-weight: 300;
  color: #8a9aaa;
  text-decoration: none;
  border-radius: 6px;
  border-left: 2px solid transparent;
  transition: all 0.3s ease;
}

.sidebar-nav a:hover,
.sidebar-nav a.active {
  color: #FFFFFF;
  background: rgba(0, 168, 255, 0.06);
  border-left-color: #00A8FF;
}

.sidebar-back {
  display: inline-block;
  margin-bottom: 28px;
  font-size: 0.8rem;
  color: #4a5a6a;
  text-decoration: none;
  transition: color 0.3s ease;
}

.sidebar-back:hover {
  color: #00A8FF;
}

/* --- Mobile Sidebar Toggle --- */
.sidebar-toggle {
  display: none;
  position: fixed;
  top: 16px;
  left: 16px;
  z-index: 30;
  width: 40px;
  height: 40px;
  border: 1px solid rgba(0, 168, 255, 0.2);
  border-radius: 8px;
  background: rgba(10, 10, 15, 0.9);
  color: #00A8FF;
  font-size: 1.2rem;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  transition: background 0.3s ease;
}

.sidebar-toggle:hover {
  background: rgba(0, 168, 255, 0.1);
}

.sidebar-toggle:focus {
  outline: 2px solid #00A8FF;
  outline-offset: 2px;
}

/* --- Paper Content --- */
.paper-content {
  flex: 1;
  margin-left: 260px;
  padding: 0 40px 60px;
  max-width: 800px;
}

/* --- Paper Metadata Header --- */
.paper-meta {
  margin-bottom: 48px;
  animation: fadeInUp 1s ease-out;
}

.paper-title {
  font-family: 'Cinzel', serif;
  font-size: 2.2rem;
  font-weight: 700;
  letter-spacing: 4px;
  color: #FFFFFF;
  margin-bottom: 16px;
  line-height: 1.3;
}

.paper-title .accent {
  color: #00A8FF;
  text-shadow: 0 0 30px rgba(0, 168, 255, 0.4),
               0 0 60px rgba(0, 168, 255, 0.15);
}

.paper-meta-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.paper-date {
  font-size: 0.8rem;
  color: #5a6a7a;
}

.paper-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.paper-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  font-family: 'Poppins', sans-serif;
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 1px;
  border-radius: 6px;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s ease;
}

.btn-primary {
  color: #00A8FF;
  border: 1px solid rgba(0, 168, 255, 0.3);
  background: rgba(0, 168, 255, 0.1);
}

.btn-primary:hover {
  background: rgba(0, 168, 255, 0.18);
  border-color: rgba(0, 168, 255, 0.5);
  transform: translateY(-1px);
  color: #00A8FF;
}

.btn-secondary {
  color: #8a9aaa;
  border: 1px solid rgba(138, 154, 170, 0.2);
  background: rgba(138, 154, 170, 0.06);
}

.btn-secondary:hover {
  background: rgba(138, 154, 170, 0.12);
  border-color: rgba(138, 154, 170, 0.35);
  transform: translateY(-1px);
  color: #c0d0e0;
}

.paper-meta-divider {
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, rgba(0, 168, 255, 0.2), transparent);
  margin-top: 24px;
}

/* --- Paper Sections --- */
.paper-section {
  margin-bottom: 48px;
  animation: fadeInUp 1s ease-out 0.3s both;
}

.paper-section h2 {
  font-family: 'Cinzel', serif;
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: 3px;
  color: #FFFFFF;
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(0, 168, 255, 0.1);
}

.paper-section h3 {
  font-family: 'Poppins', sans-serif;
  font-size: 1.05rem;
  font-weight: 600;
  color: #c0d0e0;
  margin-bottom: 12px;
  margin-top: 24px;
}

.paper-section p {
  font-size: 0.92rem;
  font-weight: 300;
  color: #8a9aaa;
  line-height: 1.85;
  margin-bottom: 16px;
}

.paper-section ul,
.paper-section ol {
  margin: 12px 0 16px 20px;
  font-size: 0.92rem;
  font-weight: 300;
  color: #8a9aaa;
  line-height: 1.85;
}

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

.paper-section code {
  font-size: 0.85rem;
  padding: 2px 8px;
  background: rgba(0, 168, 255, 0.08);
  border: 1px solid rgba(0, 168, 255, 0.12);
  border-radius: 4px;
  color: #00A8FF;
}

.paper-section pre {
  padding: 20px;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(0, 168, 255, 0.08);
  border-radius: 8px;
  overflow-x: auto;
  margin-bottom: 16px;
}

.paper-section pre code {
  padding: 0;
  background: none;
  border: none;
  color: #c0d0e0;
  font-size: 0.82rem;
  line-height: 1.7;
}

.paper-section blockquote {
  margin: 16px 0;
  padding: 16px 20px;
  border-left: 3px solid rgba(0, 168, 255, 0.3);
  background: rgba(0, 168, 255, 0.03);
  border-radius: 0 8px 8px 0;
  color: #8a9aaa;
  font-size: 0.9rem;
  font-style: italic;
  line-height: 1.7;
}

/* --- Responsive --- */
@media (max-width: 900px) {
  /* Hub */
  .hub-title {
    font-size: 2rem;
    letter-spacing: 4px;
  }

  .hub-subtitle {
    font-size: 0.75rem;
    letter-spacing: 3px;
  }

  .paper-grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  /* Paper page */
  .paper-sidebar {
    transform: translateX(-100%);
  }

  .paper-sidebar.open {
    transform: translateX(0);
  }

  .sidebar-toggle {
    display: flex;
  }

  .paper-content {
    margin-left: 0;
    padding: 0 20px 40px;
    max-width: 100%;
  }

  .paper-title {
    font-size: 1.6rem;
    letter-spacing: 2px;
  }

  .paper-section h2 {
    font-size: 1.15rem;
    letter-spacing: 2px;
  }
}

/* Sidebar overlay on mobile */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 15;
}

.sidebar-overlay.visible {
  display: block;
}

@media (max-width: 900px) {
  .back-link {
    top: 16px;
    left: 64px;
  }
}