/* ============================================================
   Jingjing's Paper Notebook — Style System
   Light/Dark themes + vibrant journal accents + glassmorphism
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Merriweather:ital,wght@0,400;0,700;1,400&family=JetBrains+Mono:wght@400;500&display=swap');

/* ============================================================
   LIGHT THEME (default)
   ============================================================ */
:root {
  /* Base */
  --bg-deep: #f5f7fa;
  --bg-card: rgba(255, 255, 255, 0.92);
  --bg-glass: rgba(0, 0, 0, 0.04);
  --bg-glass-hover: rgba(0, 0, 0, 0.08);
  --border: rgba(0, 0, 0, 0.08);
  --border-hover: rgba(0, 0, 0, 0.18);

  /* Text */
  --text-primary: #0d1117;
  --text-secondary: #424a53;
  --text-dim: #8b949e;

  /* Navbar */
  --nav-bg: rgba(255, 255, 255, 0.9);
  --nav-border: rgba(0, 0, 0, 0.08);

  /* Grid lines */
  --grid-line: rgba(0, 0, 0, 0.04);

  /* Ambient glow */
  --ambient-color: rgba(88, 166, 255, 0.08);

  /* Accent */
  --accent: #1a7fd4;
  --accent-glow: rgba(26, 127, 212, 0.2);

  /* Toggle icon */
  --toggle-icon: '🌙';

  /* Shadows */
  --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.06), 0 0 0 1px rgba(0, 0, 0, 0.04);
  --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.12), 0 0 0 1px rgba(0, 0, 0, 0.06);
}

/* ============================================================
   DARK THEME
   ============================================================ */
[data-theme="dark"] {
  --bg-deep: #0d1117;
  --bg-card: rgba(22, 27, 34, 0.85);
  --bg-glass: rgba(255, 255, 255, 0.04);
  --bg-glass-hover: rgba(255, 255, 255, 0.08);
  --border: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(255, 255, 255, 0.18);

  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --text-dim: #484f58;

  --nav-bg: rgba(13, 17, 23, 0.85);
  --nav-border: rgba(255, 255, 255, 0.08);

  --grid-line: rgba(88, 166, 255, 0.03);
  --ambient-color: rgba(88, 166, 255, 0.07);

  --accent: #58a6ff;
  --accent-glow: rgba(88, 166, 255, 0.25);

  --toggle-icon: '☀️';

  --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(255, 255, 255, 0.05);
}

/* ============================================================
   GLOBAL RESET
   ============================================================ */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: 'Inter', system-ui, sans-serif;
  background-color: var(--bg-deep);
  color: var(--text-primary);
  line-height: 1.65;
  min-height: 100vh;
  overflow-x: hidden;
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* Background grid */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
  z-index: 0;
}

/* Ambient glow */
body::after {
  content: '';
  position: fixed;
  top: -20%;
  right: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--ambient-color) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

/* ============================================================
   LAYOUT
   ============================================================ */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* ============================================================
   NAVIGATION
   ============================================================ */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  background: var(--nav-bg);
  border-bottom: 1px solid var(--nav-border);
  transition: background 0.3s ease, border-color 0.3s ease;
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 32px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  flex-shrink: 0;
}

.logo-icon {
  width: 34px;
  height: 34px;
  background: linear-gradient(135deg, var(--accent), #a371f7);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  box-shadow: 0 0 20px var(--accent-glow);
  transition: box-shadow 0.3s ease;
}

.logo-text {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.3px;
  transition: color 0.3s ease;
}

.logo-sub {
  font-size: 0.7rem;
  color: var(--text-dim);
  font-weight: 400;
  display: block;
  margin-top: -4px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 20px;
  list-style: none;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  padding: 6px 12px;
  border-radius: 6px;
  transition: color 0.15s ease, background 0.15s ease;
}

.nav-links a:hover {
  color: var(--text-primary);
  background: var(--bg-glass);
}

.nav-count {
  background: rgba(88, 166, 255, 0.12);
  color: var(--accent);
  border: 1px solid rgba(88, 166, 255, 0.3);
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 2px 10px;
}

/* ── Theme Toggle Button ──────────────────────────────────── */
.theme-toggle {
  background: var(--bg-glass);
  border: 1px solid var(--border);
  border-radius: 20px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all 0.2s ease;
  white-space: nowrap;
}

.theme-toggle:hover {
  color: var(--text-primary);
  border-color: var(--border-hover);
  background: var(--bg-glass-hover);
}

.theme-toggle .toggle-icon {
  font-size: 0.95rem;
}

.theme-toggle .toggle-label {
  font-size: 0.78rem;
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
  padding: 64px 0 40px;
  text-align: center;
  position: relative;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(88, 166, 255, 0.1);
  border: 1px solid rgba(88, 166, 255, 0.25);
  border-radius: 20px;
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 5px 14px;
  margin-bottom: 20px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.hero h1 {
  font-family: 'Merriweather', Georgia, serif;
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 20px;
  color: var(--text-primary);
  transition: color 0.3s ease;
}

.hero p {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 580px;
  margin: 0 auto 32px;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 32px;
  flex-wrap: wrap;
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

.stat-number {
  font-size: 1.8rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent), #a371f7);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* ============================================================
   SEARCH & FILTER BAR
   ============================================================ */
.controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  margin-bottom: 32px;
  padding: 20px 24px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-card);
  transition: background 0.3s ease, border-color 0.3s ease;
}

.search-wrap {
  flex: 1;
  min-width: 220px;
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--bg-deep);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px 16px;
  transition: border-color 0.15s ease, background 0.3s ease;
}

.search-wrap:focus-within {
  border-color: var(--accent);
}

.search-wrap svg {
  color: var(--text-dim);
  flex-shrink: 0;
}

.search-input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text-primary);
  font-family: 'Inter', sans-serif;
  font-size: 0.9rem;
}

.search-input::placeholder {
  color: var(--text-dim);
}

.filter-group {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.filter-chip {
  padding: 5px 14px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-secondary);
  transition: all 0.15s ease;
  white-space: nowrap;
}

.filter-chip:hover {
  color: var(--text-primary);
  border-color: var(--border-hover);
}

.filter-chip.active {
  color: var(--bg-deep);
  font-weight: 600;
}

/* ── Second controls row (Deep Notes toggle + Sort) ──────── */
.controls-row2 {
  margin-top: -20px;
  /* tuck just below the first row */
  padding: 10px 20px;
  background: transparent;
  border: none;
  box-shadow: none;
  backdrop-filter: none;
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

/* Deep Notes chip — checkbox-style toggle */
.deep-notes-chip {
  border-style: dashed;
  border-color: var(--border-hover);
  color: var(--text-secondary);
  gap: 6px;
  display: inline-flex;
  align-items: center;
}

.deep-notes-chip::before {
  content: '☐';
  font-size: 1rem;
  line-height: 1;
  transition: content 0.1s;
}

.deep-notes-chip:hover {
  color: var(--text-primary);
  border-color: var(--accent);
  background: var(--bg-glass);
}

/* Active = clearly checked: accent fill, white text, solid ✓ */
.deep-notes-chip.active {
  background: var(--accent);
  border-color: var(--accent);
  border-style: solid;
  color: #fff;
  font-weight: 600;
  box-shadow: 0 0 12px var(--accent-glow);
}

.deep-notes-chip.active::before {
  content: '✓';
}

.deep-notes-chip.active:hover {
  background: var(--accent);
  opacity: 0.88;
}

/* Unread Only chip — mirrors deep-notes-chip, green accent */
.unread-chip {
  border-style: dashed;
  border-color: var(--border-hover);
  color: var(--text-secondary);
  gap: 6px;
  display: inline-flex;
  align-items: center;
}

.unread-chip:hover {
  color: var(--text-primary);
  border-color: #4caf50;
  background: var(--bg-glass);
}

.unread-chip.active {
  background: #4caf50;
  border-color: #4caf50;
  border-style: solid;
  color: #fff;
  font-weight: 600;
  box-shadow: 0 0 12px rgba(76, 175, 80, 0.4);
}

.unread-chip.active:hover {
  background: #4caf50;
  opacity: 0.88;
}

/* Read Only chip — amber accent to distinguish from green unread chip */
.read-only-chip {
  border-style: dashed;
  border-color: var(--border-hover);
  color: var(--text-secondary);
  gap: 6px;
  display: inline-flex;
  align-items: center;
}

.read-only-chip:hover {
  color: var(--text-primary);
  border-color: #ffa726;
  background: var(--bg-glass);
}

.read-only-chip.active {
  background: #ffa726;
  border-color: #ffa726;
  border-style: solid;
  color: #fff;
  font-weight: 600;
  box-shadow: 0 0 12px rgba(255, 167, 38, 0.4);
}

.read-only-chip.active:hover {
  background: #ffa726;
  opacity: 0.88;
}

/* ── Read Checkbox (on each card) ────────────────────────────── */
.read-checkbox {
  margin-left: auto;
  padding: 2px 10px;
  border-radius: 20px;
  border: 1px dashed var(--border-hover);
  background: transparent;
  color: var(--text-dim);
  font-size: 0.72rem;
  font-family: 'Inter', sans-serif;
  font-weight: 500;
  cursor: pointer;
  white-space: nowrap;
  transition: border-color 0.15s ease, color 0.15s ease, background 0.15s ease;
  flex-shrink: 0;
}

.read-checkbox:hover {
  border-color: #4caf50;
  color: #4caf50;
  border-style: solid;
}

.read-checkbox--read {
  border-style: solid;
  border-color: #4caf50;
  background: rgba(76, 175, 80, 0.12);
  color: #4caf50;
  font-weight: 600;
}

.read-checkbox--read:hover {
  border-color: #e57373;
  color: #e57373;
  background: rgba(229, 115, 115, 0.1);
}

/* ── Read card: subtle dimming ───────────────────────────────── */
.paper-card--read {
  opacity: 0.62;
  filter: saturate(0.7);
}

.paper-card--read:hover {
  opacity: 1;
  filter: saturate(1);
}

/* Sort select */
.sort-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
  /* push to the right */
}

.sort-label {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-dim);
  white-space: nowrap;
}

.sort-select {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-secondary);
  font-family: 'Inter', sans-serif;
  font-size: 0.8rem;
  font-weight: 500;
  padding: 5px 28px 5px 10px;
  cursor: pointer;
  outline: none;
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%238b949e' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 8px center;
  transition: border-color 0.15s ease, background-color 0.3s ease;
}

.sort-select:hover,
.sort-select:focus {
  border-color: var(--accent);
  color: var(--text-primary);
}

/* ============================================================
   PAPER GRID
   ============================================================ */
.papers-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 20px;
  margin-bottom: 64px;
}


/* ============================================================
   PAPER CARD
   ============================================================ */
.paper-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
  cursor: pointer;
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  gap: 16px;
  position: relative;
  overflow: hidden;
  transition: transform 0.3s ease, border-color 0.3s ease,
    box-shadow 0.3s ease, background 0.3s ease;
  backdrop-filter: blur(8px);
  box-shadow: var(--shadow-card);
  animation: fadeInUp 0.4s ease both;
}

.paper-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--card-accent, var(--accent)), transparent);
  border-radius: 16px 16px 0 0;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.paper-card:hover {
  transform: translateY(-4px);
  border-color: var(--card-accent, var(--accent));
  box-shadow: var(--shadow-hover);
}

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

.paper-card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at top left, var(--accent-glow, transparent), transparent 70%);
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
}

.paper-card:hover::after {
  opacity: 0.4;
}

.card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.journal-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 0.72rem;
  font-weight: 600;
  white-space: nowrap;
  flex-shrink: 0;
  letter-spacing: 0.3px;
  text-transform: uppercase;
}

.card-year {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-dim);
  background: var(--bg-glass);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 2px 8px;
  flex-shrink: 0;
}

.card-title {
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.45;
  color: var(--text-primary);
  letter-spacing: -0.2px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-authors {
  font-size: 0.82rem;
  color: var(--text-secondary);
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-abstract {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: auto;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tag {
  font-size: 0.72rem;
  font-weight: 500;
  padding: 2px 8px;
  border-radius: 20px;
  background: var(--bg-glass);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  transition: all 0.15s ease;
}

.tag:hover {
  color: var(--text-primary);
  border-color: var(--border-hover);
}

.star-rating {
  display: flex;
  gap: 2px;
}

.star {
  font-size: 0.75rem;
}

.star.filled {
  color: #f0a500;
}

.star.empty {
  color: var(--text-dim);
}

/* No results */
.no-results {
  grid-column: 1 / -1;
  text-align: center;
  padding: 64px 0;
  color: var(--text-dim);
}

.no-results svg {
  margin-bottom: 16px;
  opacity: 0.4;
}

.no-results h3 {
  font-size: 1.2rem;
  margin-bottom: 8px;
  color: var(--text-secondary);
}

/* ============================================================
   PAPER DETAIL PAGE
   ============================================================ */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  margin: 32px 0 0;
  transition: all 0.15s ease;
  width: fit-content;
}

.back-link:hover {
  color: var(--text-primary);
  border-color: var(--border-hover);
  background: var(--bg-glass);
}

.paper-hero {
  padding: 32px 0 40px;
}

.paper-meta-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}

.paper-title {
  font-family: 'Merriweather', Georgia, serif;
  font-size: clamp(1.5rem, 3.5vw, 2.2rem);
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 20px;
  color: var(--text-primary);
  max-width: 900px;
}

.paper-authors {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.paper-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 32px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: 10px;
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: all 0.15s ease;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), #a371f7);
  color: #fff;
  box-shadow: 0 4px 15px var(--accent-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px var(--accent-glow);
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
}

.btn-outline:hover {
  border-color: var(--border-hover);
  color: var(--text-primary);
  background: var(--bg-glass);
}

/* Active read state on detail page */
.btn-read-active {
  border-color: #4caf50 !important;
  color: #4caf50 !important;
  background: rgba(76, 175, 80, 0.1) !important;
}

.btn-read-active:hover {
  background: rgba(76, 175, 80, 0.18) !important;
}

.paper-content {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 32px;
  margin-bottom: 64px;
}

@media (max-width: 900px) {
  .paper-content {
    grid-template-columns: 1fr;
  }
}

.content-main {
  min-width: 0;
}

.content-side {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.section-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
  backdrop-filter: blur(8px);
  box-shadow: var(--shadow-card);
  transition: background 0.3s ease, border-color 0.3s ease;
}

.section-card+.section-card {
  margin-top: 20px;
}

.section-label {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

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

.abstract-text {
  font-family: 'Merriweather', Georgia, serif;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--text-secondary);
}

.notes-content {
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--text-secondary);
}

.notes-content h2 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 20px 0 8px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.notes-content h3 {
  font-size: 0.9rem;
  font-weight: 600;
  margin: 16px 0 8px;
}

.notes-content ul,
.notes-content ol {
  margin: 8px 0 16px 20px;
}

.notes-content li {
  margin-bottom: 8px;
}

.notes-content strong {
  color: var(--text-primary);
  font-weight: 600;
}

.notes-content code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.82rem;
  background: rgba(88, 166, 255, 0.1);
  color: var(--accent);
  padding: 1px 6px;
  border-radius: 4px;
}

.notes-content p {
  margin-bottom: 16px;
}

.notes-content .task-item {
  list-style: none;
  padding-left: 20px;
  position: relative;
}

.notes-content .task-item::before {
  content: '☐';
  position: absolute;
  left: 0;
  color: var(--text-dim);
}

.notes-content .task-item.done::before {
  content: '☑';
  color: var(--accent);
}

.info-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  font-size: 0.82rem;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
}

.info-row:last-child {
  border-bottom: none;
}

.info-key {
  color: var(--text-dim);
  flex-shrink: 0;
}

.info-val {
  color: var(--text-primary);
  font-weight: 500;
  text-align: right;
}

.tags-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
  text-align: center;
  color: var(--text-dim);
  font-size: 0.8rem;
  position: relative;
  z-index: 1;
  transition: border-color 0.3s ease;
}

.footer a {
  color: var(--accent);
  text-decoration: none;
}

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

/* ============================================================
   JOURNAL BADGE COLOURS
   ============================================================ */
.journal-nature-plants {
  background: rgba(76, 175, 80, 0.12);
  color: #2e7d32;
  border: 1px solid rgba(76, 175, 80, 0.3);
}

.journal-nature-genetics {
  background: rgba(171, 71, 188, 0.12);
  color: #7b1fa2;
  border: 1px solid rgba(171, 71, 188, 0.3);
}

.journal-nature-methods {
  background: rgba(41, 182, 246, 0.12);
  color: #0277bd;
  border: 1px solid rgba(41, 182, 246, 0.3);
}

.journal-nature-biotech {
  background: rgba(255, 112, 67, 0.12);
  color: #bf360c;
  border: 1px solid rgba(255, 112, 67, 0.3);
}

.journal-nature {
  background: rgba(239, 83, 80, 0.12);
  color: #c62828;
  border: 1px solid rgba(239, 83, 80, 0.3);
}

.journal-cell {
  background: rgba(255, 167, 38, 0.12);
  color: #e65100;
  border: 1px solid rgba(255, 167, 38, 0.3);
}

.journal-cell-genomics {
  background: rgba(38, 198, 218, 0.12);
  color: #00838f;
  border: 1px solid rgba(38, 198, 218, 0.3);
}

.journal-genome-biology {
  background: rgba(102, 187, 106, 0.12);
  color: #2e7d32;
  border: 1px solid rgba(102, 187, 106, 0.3);
}

.journal-pnas {
  background: rgba(92, 107, 192, 0.12);
  color: #283593;
  border: 1px solid rgba(92, 107, 192, 0.3);
}

.journal-biorxiv {
  background: rgba(236, 64, 122, 0.12);
  color: #880e4f;
  border: 1px solid rgba(236, 64, 122, 0.3);
}

.journal-mbe {
  background: rgba(141, 110, 99, 0.12);
  color: #4e342e;
  border: 1px solid rgba(141, 110, 99, 0.3);
}

.journal-arxiv {
  background: rgba(255, 112, 67, 0.12);
  color: #bf360c;
  border: 1px solid rgba(255, 112, 67, 0.3);
}

.journal-default {
  background: rgba(139, 148, 158, 0.12);
  color: #424a53;
  border: 1px solid rgba(139, 148, 158, 0.3);
}

/* In dark mode, use lighter text for badges */
[data-theme="dark"] .journal-nature-plants {
  color: #4caf50;
}

[data-theme="dark"] .journal-nature-genetics {
  color: #ab47bc;
}

[data-theme="dark"] .journal-nature-methods {
  color: #29b6f6;
}

[data-theme="dark"] .journal-nature-biotech {
  color: #ff7043;
}

[data-theme="dark"] .journal-nature {
  color: #ef5350;
}

[data-theme="dark"] .journal-cell {
  color: #ffa726;
}

[data-theme="dark"] .journal-cell-genomics {
  color: #26c6da;
}

[data-theme="dark"] .journal-genome-biology {
  color: #66bb6a;
}

[data-theme="dark"] .journal-pnas {
  color: #5c6bc0;
}

[data-theme="dark"] .journal-biorxiv {
  color: #ec407a;
}

[data-theme="dark"] .journal-mbe {
  color: #8d6e63;
}

[data-theme="dark"] .journal-arxiv {
  color: #ff7043;
}

[data-theme="dark"] .journal-default {
  color: #8b949e;
}

/* ============================================================
   ANIMATIONS
   ============================================================ */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.paper-card:nth-child(1) {
  animation-delay: 0.05s;
}

.paper-card:nth-child(2) {
  animation-delay: 0.10s;
}

.paper-card:nth-child(3) {
  animation-delay: 0.15s;
}

.paper-card:nth-child(4) {
  animation-delay: 0.20s;
}

.paper-card:nth-child(5) {
  animation-delay: 0.25s;
}

.paper-card:nth-child(6) {
  animation-delay: 0.30s;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 768px) {
  .papers-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding: 40px 0 32px;
  }

  .nav-links {
    display: none;
  }

  .theme-toggle .toggle-label {
    display: none;
  }
}

/* ============================================================
   SCROLLBAR
   ============================================================ */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--border-hover);
}

/* ============================================================
   NOTEBOOKLM INTEGRATION
   ============================================================ */

/* 📓 Deep Notes badge on card */
.nlm-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 9px;
  border-radius: 20px;
  font-size: 0.7rem;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
  background: rgba(0, 188, 212, 0.12);
  color: #00acc1;
  border: 1px solid rgba(0, 188, 212, 0.3);
  transition: all 0.2s ease;
  flex-shrink: 0;
}

.nlm-badge:hover {
  background: rgba(0, 188, 212, 0.22);
  border-color: rgba(0, 188, 212, 0.5);
  transform: translateY(-1px);
  box-shadow: 0 3px 8px rgba(0, 188, 212, 0.2);
}

[data-theme="dark"] .nlm-badge {
  background: rgba(0, 188, 212, 0.15);
  color: #26c6da;
  border-color: rgba(0, 188, 212, 0.35);
}

/* Right side of card footer — groups badge + stars */
.card-footer-right {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

/* NotebookLM section card on paper detail page */
.section-nlm {
  border-color: rgba(0, 188, 212, 0.25);
  background: rgba(0, 188, 212, 0.04);
}

[data-theme="dark"] .section-nlm {
  border-color: rgba(0, 188, 212, 0.2);
  background: rgba(0, 188, 212, 0.06);
}

/* "Open in NotebookLM ↗" link in section header */
.nlm-link-out {
  margin-left: auto;
  font-size: 0.7rem;
  font-weight: 600;
  text-decoration: none;
  color: #00acc1;
  letter-spacing: 0;
  text-transform: none;
  padding: 2px 8px;
  border-radius: 6px;
  border: 1px solid rgba(0, 188, 212, 0.3);
  background: rgba(0, 188, 212, 0.08);
  transition: all 0.15s ease;
  white-space: nowrap;
}

.nlm-link-out:hover {
  background: rgba(0, 188, 212, 0.18);
  border-color: rgba(0, 188, 212, 0.5);
}

[data-theme="dark"] .nlm-link-out {
  color: #26c6da;
}