/* ==========================================================================
   Modern Academic Portfolio - Design System
   Professor Denvil R. Duncan | Indiana University
   ========================================================================== */

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

:root {
  /* Color Palette - Light Theme */
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-glass: rgba(255, 255, 255, 0.7);
  --border-color: rgba(226, 232, 240, 0.8);
  --border-color-hover: rgba(153, 0, 0, 0.3);

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --text-inverse: #ffffff;

  /* Brand Accents - Indiana Crimson & Academic Navy */
  --accent-crimson: #990000;
  --accent-crimson-hover: #b30000;
  --accent-crimson-light: rgba(153, 0, 0, 0.08);
  --accent-crimson-glow: rgba(153, 0, 0, 0.2);
  
  --accent-navy: #1e3a8a;
  --accent-navy-light: rgba(30, 58, 138, 0.08);
  
  --accent-emerald: #059669;
  --accent-amber: #d97706;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.05);
  --shadow-md: 0 4px 12px -2px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 12px 32px -4px rgba(15, 23, 42, 0.12);
  --shadow-crimson: 0 8px 24px -4px rgba(153, 0, 0, 0.25);

  /* Fonts */
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-serif: 'Playfair Display', Georgia, serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Transitions */
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
}

[data-theme="dark"] {
  /* Color Palette - Dark Theme */
  --bg-primary: #0b0f19;
  --bg-secondary: #111827;
  --bg-tertiary: #1f2937;
  --bg-card: rgba(17, 24, 39, 0.75);
  --bg-glass: rgba(17, 24, 39, 0.7);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-color-hover: rgba(239, 68, 68, 0.4);

  --text-primary: #f9fafb;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;
  --text-inverse: #0f172a;

  --accent-crimson: #ef4444;
  --accent-crimson-hover: #dc2626;
  --accent-crimson-light: rgba(239, 68, 68, 0.12);
  --accent-crimson-glow: rgba(239, 68, 68, 0.3);

  --accent-navy: #3b82f6;
  --accent-navy-light: rgba(59, 130, 246, 0.12);

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.6);
}

/* Base Reset */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent-crimson);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--accent-crimson-hover);
}

/* Ambient Background Effect */
.bg-ambient-glow {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: -1;
  overflow: hidden;
}

.bg-ambient-glow::before {
  content: '';
  position: absolute;
  top: -10%;
  right: -5%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--accent-crimson-light) 0%, transparent 70%);
  filter: blur(80px);
  opacity: 0.7;
}

.bg-ambient-glow::after {
  content: '';
  position: absolute;
  bottom: 10%;
  left: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, var(--accent-navy-light) 0%, transparent 70%);
  filter: blur(80px);
  opacity: 0.5;
}

/* Header & Glass Navigation */
.header-navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 72px;
  z-index: 1000;
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  transition: all var(--transition-normal);
}

.header-container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text-primary);
}

.brand-badge {
  width: 36px;
  height: 36px;
  background: var(--accent-crimson);
  color: white;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.1rem;
  letter-spacing: -0.5px;
  box-shadow: var(--shadow-crimson);
}

.brand-text {
  font-family: var(--font-serif);
  letter-spacing: -0.2px;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
}

.nav-link {
  padding: 8px 14px;
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.92rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.nav-link:hover, .nav-link.active {
  color: var(--accent-crimson);
  background: var(--accent-crimson-light);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn-theme-toggle {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.1rem;
  transition: all var(--transition-fast);
}

.btn-theme-toggle:hover {
  color: var(--accent-crimson);
  transform: scale(1.05);
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: var(--accent-crimson);
  color: #ffffff !important;
  font-weight: 600;
  font-size: 0.9rem;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  box-shadow: var(--shadow-crimson);
  transition: all var(--transition-bounce);
}

.btn-primary:hover {
  background: var(--accent-crimson-hover);
  transform: translateY(-2px);
  box-shadow: 0 10px 28px -4px rgba(153, 0, 0, 0.4);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-weight: 600;
  font-size: 0.9rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-secondary:hover {
  border-color: var(--accent-crimson);
  color: var(--accent-crimson);
  background: var(--bg-secondary);
}

/* Layout Containers */
.section-container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 100px 24px 60px;
}

/* Hero Section */
.hero-grid {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 48px;
  align-items: center;
  padding-top: 40px;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: var(--accent-crimson-light);
  color: var(--accent-crimson);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 16px;
  border: 1px solid rgba(153, 0, 0, 0.15);
}

.hero-title {
  font-family: var(--font-serif);
  font-size: 3.2rem;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.5px;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  font-weight: 500;
  margin-bottom: 24px;
}

.hero-subtitle span {
  color: var(--accent-crimson);
  font-weight: 600;
}

/* Hero Profile Row (Unified Photo + Name/Rank/School) */
.hero-profile-row {
  display: flex;
  align-items: center;
  gap: 32px;
  margin-bottom: 28px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-md);
}

.hero-profile-avatar {
  width: 160px;
  height: 160px;
  border-radius: var(--radius-md);
  object-fit: cover;
  object-position: top center;
  border: 2px solid var(--accent-crimson);
  box-shadow: var(--shadow-crimson);
  flex-shrink: 0;
}

.hero-profile-details {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.hero-bio {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin-bottom: 28px;
  line-height: 1.7;
}

.research-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 36px;
}

.tag-pill {
  padding: 6px 14px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 500;
  transition: all var(--transition-fast);
}

.tag-pill:hover {
  border-color: var(--accent-crimson);
  color: var(--accent-crimson);
}

.hero-cta {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

/* Academic Profile Card / Photo Container */
.profile-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(12px);
  text-align: center;
  position: relative;
}

.profile-avatar-wrapper {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1;
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: 16px;
  border: 2px solid var(--border-color);
  background: linear-gradient(135deg, rgba(153, 0, 0, 0.08) 0%, rgba(30, 58, 138, 0.08) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.1);
}

.profile-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
  transition: transform var(--transition-normal);
}

.profile-avatar-wrapper:hover .profile-img {
  transform: scale(1.04);
}

.feature-photo-card {
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-md);
  margin-bottom: 20px;
  background: var(--bg-tertiary);
}

.feature-photo-img {
  width: 100%;
  height: 320px;
  object-fit: cover;
  object-position: top center;
  display: block;
  transition: transform var(--transition-normal);
}

.feature-photo-card:hover .feature-photo-img {
  transform: scale(1.02);
}

.profile-affiliation {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.profile-dept {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.quick-stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border-color);
}

.stat-item {
  background: var(--bg-tertiary);
  padding: 10px;
  border-radius: var(--radius-sm);
}

.stat-number {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--accent-crimson);
}

.stat-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Feature Spotlight / Forbes Story Banner */
.spotlight-card {
  margin-top: 48px;
  background: linear-gradient(135deg, rgba(153, 0, 0, 0.05) 0%, rgba(30, 58, 138, 0.05) 100%);
  border: 1px solid var(--border-color-hover);
  border-radius: var(--radius-lg);
  padding: 28px 36px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 24px;
  align-items: center;
}

.spotlight-badge {
  width: 52px;
  height: 52px;
  background: var(--accent-crimson-light);
  color: var(--accent-crimson);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}

.spotlight-title {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.spotlight-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

/* Section Headings */
.section-header {
  margin-bottom: 36px;
}

.section-subtitle {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  font-weight: 700;
  color: var(--accent-crimson);
  margin-bottom: 8px;
}

.section-title {
  font-family: var(--font-serif);
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.3px;
}

/* Controls: Filters & Search */
.controls-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 28px;
  flex-wrap: wrap;
}

.filter-tabs {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.filter-btn {
  padding: 8px 16px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-btn:hover, .filter-btn.active {
  background: var(--accent-crimson);
  color: #ffffff;
  border-color: var(--accent-crimson);
  box-shadow: var(--shadow-crimson);
}

.search-box {
  position: relative;
  min-width: 260px;
}

.search-input {
  width: 100%;
  padding: 10px 16px 10px 42px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  color: var(--text-primary);
  font-size: 0.9rem;
  font-family: var(--font-sans);
  outline: none;
  transition: all var(--transition-fast);
}

.search-input:focus {
  border-color: var(--accent-crimson);
  box-shadow: 0 0 0 3px var(--accent-crimson-light);
}

.search-icon {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* Publication & Working Paper Cards */
.papers-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.paper-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  transition: all var(--transition-normal);
  backdrop-filter: blur(8px);
  position: relative;
}

.paper-card:hover {
  border-color: var(--border-color-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.paper-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 8px;
}

.paper-title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.35;
}

.paper-year-badge {
  font-family: var(--font-mono);
  padding: 4px 10px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 600;
  white-space: nowrap;
}

.paper-authors {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.paper-authors strong {
  color: var(--accent-crimson);
}

.paper-journal {
  font-style: italic;
  font-size: 0.92rem;
  color: var(--accent-navy);
  margin-bottom: 12px;
}

[data-theme="dark"] .paper-journal {
  color: #60a5fa;
}

.paper-abstract {
  font-size: 0.93rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
  line-height: 1.6;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-size: 0.78rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.status-badge.accepted {
  background: rgba(16, 185, 129, 0.15);
  color: #059669;
  border: 1px solid rgba(16, 185, 129, 0.35);
}

.status-badge.under-review {
  background: rgba(217, 119, 6, 0.12);
  color: var(--accent-amber);
  border: 1px solid rgba(217, 119, 6, 0.3);
}

.status-badge.revision-requested {
  background: rgba(5, 150, 105, 0.12);
  color: var(--accent-emerald);
  border: 1px solid rgba(5, 150, 105, 0.3);
}

.status-badge.wip {
  background: var(--accent-crimson-light);
  color: var(--accent-crimson);
  border: 1px solid rgba(153, 0, 0, 0.2);
}

.paper-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 12px;

}

.btn-icon-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  transition: all var(--transition-fast);
  cursor: pointer;
}

.btn-icon-link:hover {
  background: var(--accent-crimson);
  color: #ffffff;
  border-color: var(--accent-crimson);
}

/* Teaching & Coffee Grid */
.two-column-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.content-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-md);
}

.card-icon-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 20px;
}

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--accent-crimson-light);
  color: var(--accent-crimson);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
}

.course-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.course-item {
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-color);
}

.course-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.course-code {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-crimson);
  font-weight: 700;

}

.course-name {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 2px 0 4px;
}

.course-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
}

/* Contact Footer Grid */
.contact-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 40px;
  align-items: start;
}

.contact-info-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 24px;
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  font-size: 0.98rem;
}

.contact-icon {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--accent-crimson);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.contact-detail label {
  font-size: 0.78rem;
  text-transform: uppercase;
  color: var(--text-muted);
  font-weight: 700;
  display: block;
}

.contact-detail p, .contact-detail a {
  color: var(--text-primary);
  font-weight: 500;
}

/* Modal Overlay & Styling */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(15, 23, 42, 0.75);
  backdrop-filter: blur(8px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
  padding: 24px;
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  max-width: 680px;
  width: 100%;
  padding: 32px;
  box-shadow: var(--shadow-lg);
  transform: translateY(20px) scale(0.95);
  transition: transform var(--transition-bounce);
  max-height: 90vh;
  overflow-y: auto;
}

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

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-color);
}

.modal-title {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 700;
}

.modal-close {
  background: transparent;
  border: none;
  font-size: 1.4rem;
  color: var(--text-muted);
  cursor: pointer;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.modal-close:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.bibtex-code {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 16px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-secondary);
  white-space: pre-wrap;
  overflow-x: auto;
  margin-bottom: 20px;
}

/* Footer */
footer {
  border-top: 1px solid var(--border-color);
  background: var(--bg-glass);
  padding: 40px 24px;
  text-align: center;
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-top: 80px;
}

/* Responsive Styles */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .profile-card {
    max-width: 400px;
    margin: 0 auto;
    width: 100%;
  }

  .two-column-grid, .contact-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .spotlight-card {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .spotlight-badge {
    margin: 0 auto;
  }
}

@media (max-width: 768px) {
  .header-navbar {
    height: auto;
    padding: 10px 0;
  }

  .header-container {
    flex-direction: column;
    gap: 10px;
    padding: 0 16px;
  }

  .nav-brand {
    width: 100%;
    justify-content: space-between;
  }

  .nav-menu {
    display: flex;
    width: 100%;
    overflow-x: auto;
    white-space: nowrap;
    padding-bottom: 4px;
    gap: 6px;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

  .nav-menu::-webkit-scrollbar {
    display: none;
  }

  .nav-link {
    font-size: 0.84rem;
    padding: 6px 14px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
  }

  .nav-link.active {
    background: var(--accent-crimson);
    color: #ffffff;
    border-color: var(--accent-crimson);
  }

  .nav-actions {
    display: none;
  }

  .section-container {
    padding-top: 140px !important;
    padding-left: 16px;
    padding-right: 16px;
  }

  .hero-title {
    font-size: 2.1rem;
    line-height: 1.25;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  .hero-bio {
    font-size: 0.95rem;
  }

  .hero-cta {
    flex-direction: column;
    width: 100%;
  }

  .hero-cta .btn-primary, .hero-cta .btn-secondary {
    width: 100%;
    justify-content: center;
  }

  .controls-bar {
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
  }

  .search-box {
    width: 100%;
  }

  .filter-tabs {
    overflow-x: auto;
    white-space: nowrap;
    padding-bottom: 8px;
    -webkit-overflow-scrolling: touch;
    width: 100%;
    scrollbar-width: none;
  }

  .filter-tabs::-webkit-scrollbar {
    display: none;
  }

  .paper-card {
    padding: 20px 16px;
  }

  .paper-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .paper-actions {
    flex-wrap: wrap;
  }

  .modal-box {
    padding: 20px;
    width: 92vw;
    max-height: 85vh;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.8rem;
  }

  .section-title {
    font-size: 1.55rem;
  }

  .paper-title {
    font-size: 1.05rem;
  }

  .stats-number {
    font-size: 2.2rem;
  }
}