/* ===== FONTS ===== */
@import url('https://cdn.jsdelivr.net/gh/orioncactus/pretendard@v1.3.9/dist/web/variable/pretendardvariable.min.css');
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

/* ===== CSS VARIABLES ===== */
:root {
  --bg: #FAFAF9;
  --text: #1A1A1A;
  --text-secondary: #6B7280;
  --accent: #6366F1;
  --accent2: #EC4899;
  --card-bg: #FFFFFF;
  --border: #E5E7EB;
  --surface: #F3F4F6;
  --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-lg: 0 10px 40px rgba(0,0,0,0.08), 0 2px 8px rgba(0,0,0,0.04);
  --shadow-xl: 0 20px 60px rgba(0,0,0,0.12), 0 4px 16px rgba(0,0,0,0.06);
  --radius: 16px;
  --radius-sm: 8px;
  --radius-xs: 6px;
  --font-kr: 'Pretendard Variable', 'Pretendard', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-en: 'Inter', sans-serif;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --glass-bg: rgba(255,255,255,0.72);
  --glass-border: rgba(255,255,255,0.2);
}

[data-theme="dark"] {
  --bg: #0F0F0F;
  --text: #F5F5F4;
  --text-secondary: #9CA3AF;
  --accent: #818CF8;
  --accent2: #F472B6;
  --card-bg: #1A1A1A;
  --border: #2D2D2D;
  --surface: #1F1F1F;
  --shadow: 0 1px 3px rgba(0,0,0,0.3), 0 1px 2px rgba(0,0,0,0.2);
  --shadow-lg: 0 10px 40px rgba(0,0,0,0.4), 0 2px 8px rgba(0,0,0,0.2);
  --shadow-xl: 0 20px 60px rgba(0,0,0,0.5), 0 4px 16px rgba(0,0,0,0.3);
  --glass-bg: rgba(15,15,15,0.72);
  --glass-border: rgba(255,255,255,0.06);
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-kr);
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
  font-size: 17px;
  transition: background var(--transition), color var(--transition);
  overflow-x: hidden;
}

a { color: var(--accent); text-decoration: none; }
img { max-width: 100%; display: block; }

/* ===== SKIP LINK ===== */
.skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  padding: 8px 16px;
  background: var(--accent);
  color: #fff;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  z-index: 9999;
  transition: top 0.2s;
}
.skip-link:focus {
  top: 8px;
}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-secondary); }

/* ===== HEADER ===== */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: var(--glass-bg);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--glass-border);
  transition: all var(--transition);
}

.header-inner {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 40px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-family: var(--font-en);
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--accent);
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.3); }
}

.header-right {
  display: flex;
  align-items: center;
  gap: 20px;
}

.header-date {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.theme-toggle {
  width: 40px; height: 40px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--card-bg);
  color: var(--text);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  transition: all var(--transition);
}
.theme-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: scale(1.05);
}

/* ===== HERO ===== */
.hero {
  position: relative;
  width: 100%;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('images/hero.png');
  background-size: cover;
  background-position: center;
  filter: brightness(0.3);
  transform: scale(1.05);
  transition: transform 8s ease-out;
}

.hero:hover .hero-bg {
  transform: scale(1.0);
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgba(0,0,0,0.2) 0%,
    rgba(0,0,0,0.5) 50%,
    rgba(0,0,0,0.8) 100%
  );
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 120px 40px 80px;
  max-width: 900px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  background: rgba(255,255,255,0.1);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 100px;
  font-size: 13px;
  font-weight: 600;
  color: rgba(255,255,255,0.9);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 32px;
}

.hero-badge-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: #34D399;
  animation: pulse-dot 2s ease-in-out infinite;
}

.hero-title {
  font-family: var(--font-kr);
  font-size: 80px;
  font-weight: 900;
  letter-spacing: -0.04em;
  line-height: 1.05;
  color: #FFFFFF;
  margin-bottom: 24px;
  text-shadow: 0 2px 40px rgba(0,0,0,0.3);
  text-transform: none;
}

.hero-title span.hero-accent {
  display: block;
  font-size: 120px;
  letter-spacing: -0.05em;
  line-height: 0.9;
  background: linear-gradient(135deg, #818CF8, #F472B6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 20px;
  font-weight: 400;
  color: rgba(255,255,255,0.7);
  line-height: 1.7;
  max-width: 640px;
  margin: 0 auto 48px;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 48px;
  margin-bottom: 48px;
}

.hero-stat { text-align: center; }

.hero-stat-number {
  font-family: var(--font-en);
  font-size: 36px;
  font-weight: 800;
  color: #FFFFFF;
  letter-spacing: -0.02em;
}

.hero-stat-label {
  font-size: 13px;
  font-weight: 500;
  color: rgba(255,255,255,0.5);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-top: 4px;
}

.scroll-indicator {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: rgba(255,255,255,0.4);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  animation: scroll-bounce 2s ease-in-out infinite;
}

.scroll-arrow {
  width: 24px; height: 24px;
  border-right: 2px solid rgba(255,255,255,0.4);
  border-bottom: 2px solid rgba(255,255,255,0.4);
  transform: rotate(45deg);
}

@keyframes scroll-bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(10px); }
}

/* ===== SECTIONS ===== */
.section {
  max-width: 1400px;
  margin: 0 auto;
  padding: 100px 40px;
}

.section-header {
  margin-bottom: 60px;
}

.section-label {
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.section-title {
  font-size: 42px;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  color: var(--text);
}

.section-subtitle {
  font-size: 17px;
  color: var(--text-secondary);
  margin-top: 12px;
  max-width: 600px;
}

/* ===== TRENDS SECTION ===== */
.trends-section {
  padding-bottom: 60px;
}

.trends-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 40px;
}

.trend-card {
  position: relative;
  padding: 36px 28px;
  border-radius: var(--radius);
  background: var(--card-bg);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: all var(--transition);
  text-align: center;
  overflow: hidden;
}

.trend-card:nth-child(1) { background: linear-gradient(145deg, var(--card-bg) 60%, color-mix(in srgb, #818CF8 8%, var(--card-bg))); }
.trend-card:nth-child(2) { background: linear-gradient(145deg, var(--card-bg) 60%, color-mix(in srgb, #F59E0B 8%, var(--card-bg))); }
.trend-card:nth-child(3) { background: linear-gradient(145deg, var(--card-bg) 60%, color-mix(in srgb, #EC4899 8%, var(--card-bg))); }

.trend-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  opacity: 0;
  transition: opacity var(--transition);
}

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

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

.trend-card.active {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 6%, var(--card-bg));
}

.trend-card.active::before {
  opacity: 1;
}

.trend-icon {
  font-size: 42px;
  margin-bottom: 16px;
  display: block;
}

.trend-title {
  font-size: 26px;
  font-weight: 900;
  letter-spacing: -0.03em;
  color: var(--text);
  margin-bottom: 6px;
}

.trend-subtitle {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 16px;
  line-height: 1.5;
}

.trend-count {
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.02em;
}

.trends-intro {
  font-size: 18px;
  line-height: 1.85;
  color: var(--text);
  max-width: 800px;
  opacity: 0.85;
}

/* ===== READING GUIDE ===== */
.reading-guide-section {
  padding-top: 40px;
  padding-bottom: 40px;
}

.reading-guides {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.guide-card {
  padding: 32px;
  border-radius: var(--radius);
  background: var(--card-bg);
  border: 1px solid var(--border);
  transition: all var(--transition);
}

.guide-card:hover {
  box-shadow: var(--shadow-lg);
}

.guide-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
}

.guide-icon {
  width: 40px; height: 40px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}

.guide-icon.beginner { background: rgba(16,185,129,0.12); color: #10B981; }
.guide-icon.expert { background: rgba(99,102,241,0.12); color: #6366F1; }

[data-theme="dark"] .guide-icon.beginner { background: rgba(52,211,153,0.2); color: #34D399; }
[data-theme="dark"] .guide-icon.expert { background: rgba(129,140,248,0.2); color: #818CF8; }

.guide-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
}

.guide-description {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 20px;
  padding-left: 52px;
}

.guide-steps {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  padding-left: 52px;
  margin-bottom: 16px;
}

.guide-step {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 100px;
  background: var(--surface);
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.guide-step:hover {
  background: var(--accent);
  color: #fff;
}

.guide-step-number {
  width: 20px; height: 20px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.guide-arrow {
  color: var(--text-secondary);
  font-size: 14px;
  flex-shrink: 0;
}

.guide-rationale {
  font-size: 14px;
  color: var(--text-secondary);
  font-style: italic;
  padding-left: 52px;
  line-height: 1.6;
}

/* ===== FILTER BAR ===== */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 40px;
}

.filter-btn {
  padding: 8px 18px;
  border: 1px solid var(--border);
  border-radius: 100px;
  background: var(--card-bg);
  color: var(--text-secondary);
  font-family: var(--font-kr);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.filter-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.filter-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #FFFFFF;
}

/* ===== FEATURED CARDS ===== */
.featured-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

/* Magazine-style hero card */
.featured-card:first-child .featured-card-image {
  height: 360px;
}

.featured-card:first-child .featured-card-title {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.featured-card:first-child .featured-card-oneliner {
  font-size: 17px;
}

.featured-card {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  transition: all var(--transition);
  background: var(--card-bg);
  border: 1px solid var(--border);
}

.featured-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  z-index: 2;
}

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

.featured-card-image {
  position: relative;
  height: 260px;
  overflow: hidden;
}

.featured-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.featured-card:hover .featured-card-image img {
  transform: scale(1.05);
}

.featured-card-image-overlay {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 50%;
  background: linear-gradient(transparent, rgba(0,0,0,0.6));
}

.featured-card-impact {
  position: absolute;
  top: 16px; right: 16px;
  padding: 4px 12px;
  background: rgba(99,102,241,0.9);
  backdrop-filter: blur(8px);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border-radius: 100px;
}

.featured-card-body {
  padding: 28px;
}

.featured-card-title {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.35;
  margin-bottom: 8px;
  color: var(--text);
}

.featured-card-oneliner {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
}

/* Editor's pick comment */
.featured-card-pick {
  padding: 14px 18px;
  background: var(--surface);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--accent);
  margin-bottom: 20px;
}

.featured-card-pick-label {
  font-size: 11px;
  font-weight: 700;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 4px;
}

.featured-card-pick-text {
  font-size: 14px;
  color: var(--text);
  line-height: 1.6;
  font-style: italic;
  opacity: 0.88;
}

.featured-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

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

.tag {
  padding: 4px 10px;
  border-radius: 100px;
  font-size: 12px;
  font-weight: 600;
  background: var(--surface);
  color: var(--text-secondary);
  letter-spacing: 0.02em;
}

.reading-time {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
}

/* ===== PAPER GRID ===== */
.paper-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.paper-card {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  transition: all var(--transition);
  background: var(--card-bg);
  border: 1px solid var(--border);
}

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

.paper-card-image {
  position: relative;
  height: 200px;
  overflow: hidden;
}

.paper-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.paper-card:hover .paper-card-image img {
  transform: scale(1.05);
}

.paper-card-category {
  position: absolute;
  top: 12px; left: 12px;
  width: 4px;
  height: 32px;
  border-radius: 2px;
}

.paper-card-difficulty {
  position: absolute;
  top: 12px; right: 12px;
  padding: 3px 10px;
  border-radius: 100px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
  backdrop-filter: blur(8px);
}

.difficulty-입문 { background: rgba(16,185,129,0.9); color: #fff; }
.difficulty-중급 { background: rgba(245,158,11,0.9); color: #fff; }
.difficulty-고급 { background: rgba(239,68,68,0.9); color: #fff; }

/* Community signal badge */
.paper-card-signal {
  position: absolute;
  bottom: 12px; left: 12px;
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  border-radius: 100px;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(8px);
  font-size: 12px;
  font-weight: 700;
  color: #fff;
}

/* Read indicator */
.paper-card-read {
  position: absolute;
  top: 12px; left: 24px;
  width: 24px; height: 24px;
  border-radius: 50%;
  background: rgba(16,185,129,0.9);
  color: #fff;
  font-size: 13px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(8px);
  pointer-events: none;
}

.paper-card-body {
  padding: 24px;
}

.paper-card-title {
  font-family: var(--font-en);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.4;
  margin-bottom: 6px;
  color: var(--text);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.paper-card-oneliner {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.55;
  margin-bottom: 16px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.paper-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}

.paper-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.tag-sm {
  padding: 3px 8px;
  border-radius: 100px;
  font-size: 11px;
  font-weight: 600;
  background: var(--surface);
  color: var(--text-secondary);
}

.reading-time-sm {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  white-space: nowrap;
}

/* ===== EMPTY STATE ===== */
.empty-state {
  text-align: center;
  padding: 80px 40px;
}

.empty-state-icon {
  font-size: 48px;
  margin-bottom: 16px;
}

.empty-state-text {
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 8px;
}

.empty-state-hint {
  font-size: 15px;
  color: var(--text-secondary);
}

/* ===== MODAL ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 2000;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  visibility: hidden;
  transition: all 0.35s ease;
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--card-bg);
  border-radius: var(--radius);
  width: 100%;
  max-width: 880px;
  max-height: 90vh;
  overflow-y: auto;
  transform: translateY(30px) scale(0.97);
  transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-xl);
  position: relative;
}

.modal-overlay.active .modal {
  transform: translateY(0) scale(1);
}

.modal-top-bar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 20px;
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.modal-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.modal-nav-btn {
  width: 36px; height: 36px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--card-bg);
  color: var(--text);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  transition: all var(--transition);
}

.modal-nav-btn:hover:not(:disabled) {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.modal-nav-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.modal-nav-counter {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  min-width: 60px;
  text-align: center;
}

.modal-close-btn {
  width: 36px; height: 36px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--card-bg);
  color: var(--text);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  transition: all var(--transition);
  flex-shrink: 0;
}

.modal-close-btn:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.modal-image {
  width: 100%;
  height: 300px;
  object-fit: cover;
}

.modal-body {
  padding: 36px 40px 48px;
}

/* Editor's pick in modal */
.modal-editor-pick {
  padding: 16px 20px;
  background: linear-gradient(135deg, color-mix(in srgb, var(--accent) 8%, var(--card-bg)), color-mix(in srgb, var(--accent2) 6%, var(--card-bg)));
  border-radius: var(--radius-sm);
  border-left: 4px solid var(--accent);
  margin-bottom: 24px;
}

.modal-editor-pick-label {
  font-size: 11px;
  font-weight: 700;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 6px;
}

.modal-editor-pick-text {
  font-size: 15px;
  color: var(--text);
  line-height: 1.7;
  font-style: italic;
  opacity: 0.9;
}

.modal-editor-remember {
  font-size: 14px;
  font-weight: 600;
  color: var(--accent);
  margin-top: 10px;
  font-style: normal;
}

.modal-title {
  font-family: var(--font-en);
  font-size: 24px;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.3;
  margin-bottom: 8px;
}

.modal-oneliner {
  font-size: 18px;
  font-weight: 600;
  color: var(--accent);
  line-height: 1.5;
  margin-bottom: 20px;
}

.modal-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  padding-bottom: 24px;
  margin-bottom: 28px;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
  color: var(--text-secondary);
}

.modal-meta a { font-weight: 600; }

.modal-meta-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.modal-hook {
  font-size: 17px;
  font-weight: 400;
  color: var(--text);
  line-height: 1.8;
  margin-bottom: 36px;
  padding: 20px 24px;
  background: var(--surface);
  border-radius: var(--radius-sm);
  border-left: 4px solid var(--accent);
}

.modal-section {
  margin-bottom: 28px;
}

.modal-section-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.modal-section-icon {
  width: 32px; height: 32px;
  border-radius: var(--radius-xs);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  flex-shrink: 0;
}

.modal-section-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
}

.modal-section-content {
  font-size: 16px;
  line-height: 1.8;
  color: var(--text);
  opacity: 0.88;
  padding-left: 42px;
}

/* Related papers in modal */
.modal-related {
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

.modal-related-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 16px;
}

.modal-related-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.modal-related-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  background: var(--surface);
  cursor: pointer;
  transition: all var(--transition);
}

.modal-related-item:hover {
  background: color-mix(in srgb, var(--accent) 10%, var(--surface));
  transform: translateX(4px);
}

.modal-related-badge {
  padding: 2px 8px;
  border-radius: 100px;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  white-space: nowrap;
  flex-shrink: 0;
}

.relation-complementary { background: rgba(16,185,129,0.15); color: #10B981; }
.relation-contrasting { background: rgba(239,68,68,0.15); color: #EF4444; }
.relation-builds_on { background: rgba(99,102,241,0.15); color: #6366F1; }
.relation-same_trend { background: rgba(245,158,11,0.15); color: #F59E0B; }

[data-theme="dark"] .relation-complementary { background: rgba(52,211,153,0.2); color: #34D399; }
[data-theme="dark"] .relation-contrasting { background: rgba(239,68,68,0.2); }
[data-theme="dark"] .relation-builds_on { background: rgba(129,140,248,0.2); color: #818CF8; }
[data-theme="dark"] .relation-same_trend { background: rgba(251,191,36,0.2); color: #FBBF24; }

.modal-related-text {
  flex: 1;
  min-width: 0;
}

.modal-related-paper-title {
  font-family: var(--font-en);
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.modal-related-desc {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.4;
  margin-top: 2px;
}

.modal-related-arrow {
  color: var(--text-secondary);
  font-size: 16px;
  flex-shrink: 0;
}

.modal-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

.modal-tag {
  padding: 6px 14px;
  border-radius: 100px;
  font-size: 13px;
  font-weight: 600;
  background: var(--surface);
  color: var(--text-secondary);
}

/* Section icon colors */
.icon-problem { background: rgba(239,68,68,0.12); color: #EF4444; }
.icon-method { background: rgba(99,102,241,0.12); color: #6366F1; }
.icon-results { background: rgba(16,185,129,0.12); color: #10B981; }
.icon-importance { background: rgba(245,158,11,0.12); color: #F59E0B; }
.icon-limitations { background: rgba(156,163,175,0.12); color: #9CA3AF; }
.icon-related { background: rgba(139,92,246,0.12); color: #8B5CF6; }

[data-theme="dark"] .icon-problem { background: rgba(239,68,68,0.2); }
[data-theme="dark"] .icon-method { background: rgba(129,140,248,0.2); color: #818CF8; }
[data-theme="dark"] .icon-results { background: rgba(52,211,153,0.2); color: #34D399; }
[data-theme="dark"] .icon-importance { background: rgba(251,191,36,0.2); color: #FBBF24; }
[data-theme="dark"] .icon-limitations { background: rgba(156,163,175,0.2); }
[data-theme="dark"] .icon-related { background: rgba(167,139,250,0.2); color: #A78BFA; }

/* ===== FOOTER ===== */
.footer {
  border-top: 1px solid var(--border);
  padding: 48px 40px;
  text-align: center;
}

.footer-inner {
  max-width: 1400px;
  margin: 0 auto;
}

.footer-logo {
  font-family: var(--font-en);
  font-size: 18px;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 8px;
}

.footer-text {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ===== ANIMATIONS ===== */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* stagger children */
.reveal-stagger > * {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal-stagger.visible > *:nth-child(1) { transition-delay: 0.05s; }
.reveal-stagger.visible > *:nth-child(2) { transition-delay: 0.1s; }
.reveal-stagger.visible > *:nth-child(3) { transition-delay: 0.15s; }
.reveal-stagger.visible > *:nth-child(4) { transition-delay: 0.2s; }
.reveal-stagger.visible > *:nth-child(5) { transition-delay: 0.25s; }
.reveal-stagger.visible > *:nth-child(6) { transition-delay: 0.3s; }
.reveal-stagger.visible > *:nth-child(7) { transition-delay: 0.35s; }
.reveal-stagger.visible > *:nth-child(8) { transition-delay: 0.4s; }
.reveal-stagger.visible > *:nth-child(9) { transition-delay: 0.45s; }
.reveal-stagger.visible > *:nth-child(10) { transition-delay: 0.5s; }
.reveal-stagger.visible > *:nth-child(11) { transition-delay: 0.55s; }
.reveal-stagger.visible > *:nth-child(12) { transition-delay: 0.6s; }

.reveal-stagger.visible > * {
  opacity: 1;
  transform: translateY(0);
}

/* Focus styles */
*:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

button:focus-visible,
.filter-btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .hero-title { font-size: 56px; }
  .hero-title span.hero-accent { font-size: 80px; }
  .featured-card:first-child .featured-card-image { height: 280px; }
  .featured-grid { grid-template-columns: 1fr 1fr; }
  .paper-grid { grid-template-columns: repeat(2, 1fr); }
  .section { padding: 80px 24px; }
  .header-inner { padding: 0 24px; }
  .trends-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 768px) {
  .hero-title { font-size: 36px; }
  .hero-title span.hero-accent { font-size: 52px; }
  .hero-subtitle { font-size: 16px; }
  .hero-stats { gap: 24px; }
  .hero-stat-number { font-size: 28px; }
  .featured-grid { grid-template-columns: 1fr; }
  .paper-grid { grid-template-columns: 1fr; }
  .section { padding: 60px 16px; }
  .header-inner { padding: 0 16px; }
  .header-date { display: none; }
  .section-title { font-size: 28px; }
  .modal-body { padding: 24px 20px 36px; }
  .modal-section-content { padding-left: 0; }
  .modal-image { height: 200px; }
  .filter-bar { gap: 6px; }
  .filter-btn { padding: 6px 14px; font-size: 13px; }
  .featured-card-image { height: 200px; }
  .featured-card-body { padding: 20px; }
  .featured-card-title { font-size: 18px; }
  .logo { font-size: 18px; }
  .trends-grid { grid-template-columns: 1fr; }
  .trend-card { padding: 24px 20px; }
  .trend-title { font-size: 18px; }
  .reading-guides { grid-template-columns: 1fr; }
  .guide-steps { padding-left: 0; }
  .guide-description { padding-left: 0; }
  .guide-rationale { padding-left: 0; }
  .modal-top-bar { padding: 8px 12px; }
}

/* ===== BODY MODAL OPEN ===== */
body.modal-open {
  overflow: hidden;
}

/* ===== CATEGORY COLORS ===== */
.cat-speech { background: #6366F1; }
.cat-cv { background: #EC4899; }
.cat-nlp { background: #10B981; }
.cat-ml { background: #F59E0B; }
.cat-multi { background: #8B5CF6; }
.cat-agent { background: #14B8A6; }