/* ============================================================
   PRAKASH CHAULAGAIN — PORTFOLIO  |  Shared Stylesheet
   ============================================================ */

/* ---------- Google Fonts ---------- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500;700&display=swap');

/* ---------- CSS Custom Properties ---------- */
:root {
  --bg-primary:    #06080d;
  --bg-secondary:  #0c1017;
  --bg-card:       rgba(255, 255, 255, 0.04);
  --bg-card-hover: rgba(255, 255, 255, 0.08);
  --glass-border:  rgba(255, 255, 255, 0.08);
  --glass-shadow:  rgba(0, 0, 0, 0.4);

  --accent-1: #00d4aa;         /* teal */
  --accent-2: #7c3aed;         /* violet */
  --accent-3: #3b82f6;         /* blue */
  --accent-gradient: linear-gradient(135deg, var(--accent-1), var(--accent-2));

  --text-primary:   #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted:     #64748b;

  --font-body:  'Inter', system-ui, -apple-system, sans-serif;
  --font-mono:  'JetBrains Mono', 'Fira Code', monospace;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-xl: 30px;

  --transition-fast: 0.2s cubic-bezier(.4,0,.2,1);
  --transition-med:  0.4s cubic-bezier(.4,0,.2,1);
  --transition-slow: 0.7s cubic-bezier(.4,0,.2,1);
}

/* ---------- Reset ---------- */
*, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  line-height: 1.7;
}
a { text-decoration: none; color: inherit; }
ul, ol { list-style: none; }
img { max-width: 100%; display: block; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }

/* ---------- Utility ---------- */
.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.section-padding { padding: 100px 0; }
.accent-text { background: var(--accent-gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.mono { font-family: var(--font-mono); }

/* ---------- Section Headings ---------- */
.section-header { text-align: center; margin-bottom: 64px; }
.section-header .tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--accent-1);
  margin-bottom: 12px;
  border: 1px solid rgba(0,212,170,0.25);
  padding: 4px 16px;
  border-radius: 999px;
}
.section-header h2 {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  line-height: 1.2;
}
.section-header p {
  color: var(--text-secondary);
  max-width: 560px;
  margin: 16px auto 0;
  font-size: 1.05rem;
}

/* ---------- Scroll Reveal ---------- */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}
.reveal.active {
  opacity: 1;
  transform: translateY(0);
}
.reveal-left  { transform: translateX(-40px); }
.reveal-right { transform: translateX( 40px); }
.reveal-left.active, .reveal-right.active { transform: translateX(0); }

/* ---------- Custom Cursor ---------- */
.cursor-dot {
  position: fixed;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--accent-1);
  pointer-events: none;
  z-index: 99999;
  transition: transform 0.15s ease;
  mix-blend-mode: difference;
}
.cursor-ring {
  position: fixed;
  width: 36px; height: 36px;
  border-radius: 50%;
  border: 1.5px solid var(--accent-1);
  pointer-events: none;
  z-index: 99998;
  transition: transform 0.25s ease, width 0.3s ease, height 0.3s ease, border-color 0.3s ease;
  mix-blend-mode: difference;
}
@media (pointer: coarse) { .cursor-dot, .cursor-ring { display: none; } }

/* ============================================================
   NAVBAR
   ============================================================ */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 18px 0;
  transition: background var(--transition-med), padding var(--transition-med), box-shadow var(--transition-med);
}
.navbar.scrolled {
  background: rgba(6, 8, 13, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  padding: 12px 0;
  box-shadow: 0 4px 30px rgba(0,0,0,0.3);
  border-bottom: 1px solid var(--glass-border);
}
.navbar .inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.navbar .logo {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.5px;
}
.navbar .logo span { color: var(--accent-1); }
.nav-links { display: flex; align-items: center; gap: 32px; }
.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  transition: color var(--transition-fast);
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0;
  width: 0; height: 2px;
  background: var(--accent-gradient);
  border-radius: 2px;
  transition: width var(--transition-med);
}
.nav-links a:hover, .nav-links a.active { color: var(--text-primary); }
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }

/* Mobile menu button */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 28px;
  padding: 4px 0;
}
.menu-toggle span {
  display: block;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition-fast);
}
.menu-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-toggle.open span:nth-child(2) { opacity: 0; }
.menu-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile nav overlay */
.mobile-nav {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(6, 8, 13, 0.96);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: 999;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 28px;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-med);
}
.mobile-nav.open { opacity: 1; pointer-events: all; }
.mobile-nav a {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}
.mobile-nav a:hover { color: var(--accent-1); }

@media (max-width: 768px) {
  .nav-links   { display: none; }
  .menu-toggle { display: flex; }
}

/* ============================================================
   HERO  (index.html)
   ============================================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 120px 24px 80px;
}

/* Animated gradient mesh */
.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  background:
    radial-gradient(ellipse 80% 60% at 20% 40%, rgba(0,212,170,0.12) 0%, transparent 60%),
    radial-gradient(ellipse 60% 80% at 80% 30%, rgba(124,58,237,0.12) 0%, transparent 60%),
    radial-gradient(ellipse 70% 50% at 50% 80%, rgba(59,130,246,0.08) 0%, transparent 60%);
  animation: meshMove 12s ease-in-out infinite alternate;
}
@keyframes meshMove {
  0%   { transform: scale(1)   translate(0, 0); }
  100% { transform: scale(1.1) translate(-2%, 3%); }
}

/* Floating Orbs */
.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
  opacity: 0.35;
  animation: orbFloat 8s ease-in-out infinite alternate;
  z-index: 0;
}
.orb-1 { width: 300px; height: 300px; background: var(--accent-1); top: 10%; left: 5%;  animation-duration: 10s; }
.orb-2 { width: 250px; height: 250px; background: var(--accent-2); top: 60%; right: 8%; animation-duration: 12s; animation-delay: -3s; }
.orb-3 { width: 200px; height: 200px; background: var(--accent-3); bottom: 10%; left: 40%; animation-duration: 9s; animation-delay: -5s; }
@keyframes orbFloat {
  0%   { transform: translate(0, 0) scale(1); }
  100% { transform: translate(30px, -40px) scale(1.15); }
}

/* Grid overlay */
.hero-grid {
  position: absolute;
  inset: 0;
  z-index: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
  background-size: 60px 60px;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 820px;
}
.hero-content .greeting {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--accent-1);
  letter-spacing: 2px;
  margin-bottom: 16px;
  display: inline-block;
}
.hero-content h1 {
  font-size: clamp(2.5rem, 6vw, 4.2rem);
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 20px;
  letter-spacing: -1px;
}
.hero-content .typing-wrapper {
  font-size: clamp(1.1rem, 2.5vw, 1.5rem);
  font-weight: 400;
  color: var(--text-secondary);
  margin-bottom: 16px;
  min-height: 2.4em;
}
.typing-cursor {
  display: inline-block;
  width: 2px;
  height: 1.2em;
  background: var(--accent-1);
  margin-left: 2px;
  vertical-align: text-bottom;
  animation: blink 0.8s step-end infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.hero-content .hero-desc {
  color: var(--text-muted);
  font-size: 1.05rem;
  max-width: 600px;
  margin: 0 auto 36px;
}
.hero-buttons { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}
.btn-fill {
  background: var(--accent-gradient);
  color: #fff;
}
.btn-fill:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(0,212,170,0.25); }
.btn-outline {
  border: 1.5px solid var(--glass-border);
  color: var(--text-primary);
  background: var(--bg-card);
  backdrop-filter: blur(8px);
}
.btn-outline:hover {
  border-color: var(--accent-1);
  background: rgba(0,212,170,0.06);
  transform: translateY(-2px);
}

/* Scroll indicator */
.scroll-indicator {
  position: absolute;
  bottom: 36px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  font-size: 0.75rem;
  letter-spacing: 2px;
  text-transform: uppercase;
  z-index: 1;
}
.scroll-indicator .mouse {
  width: 22px; height: 36px;
  border: 2px solid var(--text-muted);
  border-radius: 12px;
  position: relative;
}
.scroll-indicator .mouse::after {
  content: '';
  position: absolute;
  top: 6px; left: 50%;
  transform: translateX(-50%);
  width: 3px; height: 8px;
  background: var(--accent-1);
  border-radius: 3px;
  animation: scrollDown 1.8s ease-in-out infinite;
}
@keyframes scrollDown {
  0%   { opacity: 1; transform: translateX(-50%) translateY(0); }
  100% { opacity: 0; transform: translateX(-50%) translateY(14px); }
}

/* ============================================================
   PAGE HERO  (sub-pages)
   ============================================================ */
.page-hero {
  position: relative;
  padding: 160px 24px 80px;
  text-align: center;
  overflow: hidden;
  min-height: 340px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.page-hero .hero-bg, .page-hero .hero-grid { position: absolute; inset: 0; z-index: 0; }
.page-hero .hero-bg {
  background:
    radial-gradient(ellipse 70% 60% at 30% 50%, rgba(0,212,170,0.10) 0%, transparent 60%),
    radial-gradient(ellipse 60% 70% at 70% 40%, rgba(124,58,237,0.10) 0%, transparent 60%);
}
.page-hero .hero-grid {
  background-image:
    linear-gradient(rgba(255,255,255,0.015) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.015) 1px, transparent 1px);
  background-size: 60px 60px;
}
.page-hero-content { position: relative; z-index: 1; }
.page-hero-content h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 900;
  margin-bottom: 12px;
}
.page-hero-content p {
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 560px;
  margin: 0 auto;
}

/* ============================================================
   ABOUT
   ============================================================ */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 48px;
  align-items: center;
}
.about-image {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.about-image img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  filter: grayscale(20%) brightness(0.95);
  transition: filter var(--transition-med);
}
.about-image:hover img { filter: grayscale(0%) brightness(1); }
.about-image::after {
  content: '';
  position: absolute;
  inset: 0;
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  pointer-events: none;
}

.about-text h3 {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 16px;
}
.about-text p {
  color: var(--text-secondary);
  margin-bottom: 16px;
  font-size: 1.02rem;
}

/* Stats */
.stats-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 32px;
}
.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: 20px;
  text-align: center;
  backdrop-filter: blur(10px);
  transition: border-color var(--transition-fast);
}
.stat-card:hover { border-color: var(--accent-1); }
.stat-card .number {
  font-size: 2.2rem;
  font-weight: 800;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stat-card .label {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 4px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

@media (max-width: 768px) {
  .about-grid { grid-template-columns: 1fr; }
  .stats-row  { grid-template-columns: repeat(3, 1fr); gap: 12px; }
  .stat-card .number { font-size: 1.6rem; }
}

/* ============================================================
   SKILLS
   ============================================================ */
.skills-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}
.skill-category h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.skill-category h3 i { color: var(--accent-1); }
.skill-item {
  margin-bottom: 20px;
}
.skill-item .skill-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: 8px;
}
.skill-item .skill-name {
  font-size: 0.92rem;
  font-weight: 500;
}
.skill-item .skill-pct {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-1);
}
.skill-bar {
  height: 6px;
  background: rgba(255,255,255,0.06);
  border-radius: 10px;
  overflow: hidden;
}
.skill-bar-fill {
  height: 100%;
  width: 0;
  border-radius: 10px;
  background: var(--accent-gradient);
  transition: width 1.2s cubic-bezier(.4,0,.2,1);
}
@media (max-width: 768px) {
  .skills-grid { grid-template-columns: 1fr; }
}

/* ============================================================
   EXPERIENCE TIMELINE
   ============================================================ */
.timeline {
  position: relative;
  max-width: 700px;
  margin: 0 auto;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 20px;
  top: 0; bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent-1), var(--accent-2));
  opacity: 0.3;
}
.timeline-item {
  position: relative;
  padding-left: 56px;
  margin-bottom: 40px;
}
.timeline-item:last-child { margin-bottom: 0; }
.timeline-dot {
  position: absolute;
  left: 13px; top: 6px;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: var(--accent-gradient);
  box-shadow: 0 0 16px rgba(0,212,170,0.3);
}
.timeline-dot::after {
  content: '';
  position: absolute;
  inset: 3px;
  border-radius: 50%;
  background: var(--bg-primary);
}
.timeline-date {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-1);
  margin-bottom: 6px;
}
.timeline-card {
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  backdrop-filter: blur(10px);
  transition: border-color var(--transition-fast);
}
.timeline-card:hover { border-color: rgba(0,212,170,0.3); }
.timeline-card h4 { font-size: 1.05rem; font-weight: 700; margin-bottom: 4px; }
.timeline-card .subtitle { color: var(--accent-1); font-size: 0.88rem; margin-bottom: 8px; }
.timeline-card p { color: var(--text-secondary); font-size: 0.92rem; }

/* ============================================================
   GLASS CARDS  (projects / courses / books)
   ============================================================ */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 28px;
}
.glass-card {
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: transform var(--transition-med), box-shadow var(--transition-med), border-color var(--transition-med);
}
.glass-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 50px rgba(0,0,0,0.3);
  border-color: rgba(0,212,170,0.25);
}
.glass-card .card-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-bottom: 1px solid var(--glass-border);
}
.glass-card .card-body { padding: 24px; }
.glass-card .card-body h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 8px;
}
.glass-card .card-body p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  margin-bottom: 16px;
  line-height: 1.6;
}
.glass-card .card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}
.glass-card .card-tags span {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 3px 10px;
  border-radius: 999px;
  border: 1px solid rgba(0,212,170,0.2);
  color: var(--accent-1);
  background: rgba(0,212,170,0.05);
}
.glass-card .card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent-1);
  transition: gap var(--transition-fast);
}
.glass-card .card-link:hover { gap: 12px; }

/* Book Card Specific */
.book-card .card-body { display: flex; gap: 20px; }
.book-card .book-cover {
  width: 100px;
  min-width: 100px;
  height: 140px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  border: 1px solid var(--glass-border);
}
.book-card .book-info { flex: 1; }
.book-card .book-info h3 { font-size: 1.05rem; margin-bottom: 4px; }
.book-card .book-author { color: var(--accent-1); font-size: 0.85rem; margin-bottom: 8px; }
.book-card .book-info p { font-size: 0.88rem; margin-bottom: 12px; }

/* Course Card Specific */
.course-card .card-meta {
  display: flex;
  gap: 16px;
  margin-bottom: 12px;
  font-size: 0.82rem;
  color: var(--text-muted);
}
.course-card .card-meta span { display: flex; align-items: center; gap: 5px; }
.course-card .card-meta i { color: var(--accent-1); font-size: 0.75rem; }

/* ============================================================
   CONTACT
   ============================================================ */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}
.contact-form { width: 100%; }
.form-group { margin-bottom: 20px; }
.form-group label {
  display: block;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 8px;
}
.form-group input,
.form-group textarea {
  width: 100%;
  padding: 14px 18px;
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.95rem;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  outline: none;
}
.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--accent-1);
  box-shadow: 0 0 0 3px rgba(0,212,170,0.1);
}
.form-group textarea { resize: vertical; min-height: 130px; }

.contact-info h3 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 16px;
}
.contact-info > p {
  color: var(--text-secondary);
  margin-bottom: 28px;
}
.contact-link {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 0;
  border-bottom: 1px solid var(--glass-border);
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}
.contact-link:last-child { border-bottom: none; }
.contact-link:hover { color: var(--accent-1); }
.contact-link .icon-box {
  width: 42px; height: 42px;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  font-size: 1.1rem;
  color: var(--accent-1);
  flex-shrink: 0;
}

@media (max-width: 768px) {
  .contact-grid { grid-template-columns: 1fr; }
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--glass-border);
  padding: 40px 0;
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}
.footer-copy {
  color: var(--text-muted);
  font-size: 0.88rem;
}
.footer-socials {
  display: flex;
  gap: 12px;
}
.footer-socials a {
  width: 38px; height: 38px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 50%;
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  color: var(--text-secondary);
  font-size: 0.95rem;
  transition: color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}
.footer-socials a:hover {
  color: var(--accent-1);
  border-color: var(--accent-1);
  transform: translateY(-2px);
}

/* ============================================================
   EMPTY STATE / COMING SOON
   ============================================================ */
.empty-state {
  text-align: center;
  padding: 80px 24px;
}
.empty-state i {
  font-size: 3rem;
  color: var(--text-muted);
  margin-bottom: 20px;
}
.empty-state h3 {
  font-size: 1.4rem;
  margin-bottom: 8px;
}
.empty-state p {
  color: var(--text-secondary);
  max-width: 400px;
  margin: 0 auto;
}

/* ============================================================
   FILTER TABS
   ============================================================ */
.filter-tabs {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}
.filter-tab {
  padding: 8px 20px;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  cursor: pointer;
  transition: var(--transition-fast);
}
.filter-tab:hover, .filter-tab.active {
  color: var(--accent-1);
  border-color: var(--accent-1);
  background: rgba(0,212,170,0.06);
}

/* ============================================================
   NOTIFICATION / TOAST
   ============================================================ */
.toast {
  position: fixed;
  bottom: 32px;
  right: 32px;
  background: rgba(0,212,170,0.15);
  border: 1px solid var(--accent-1);
  backdrop-filter: blur(16px);
  color: var(--text-primary);
  padding: 16px 24px;
  border-radius: var(--radius-md);
  font-size: 0.92rem;
  z-index: 10000;
  transform: translateY(100px);
  opacity: 0;
  transition: transform 0.4s ease, opacity 0.4s ease;
}
.toast.show { transform: translateY(0); opacity: 1; }

/* ============================================================
   BACK TO TOP
   ============================================================ */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px; height: 44px;
  border-radius: 50%;
  background: var(--accent-gradient);
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem;
  z-index: 100;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--transition-fast), transform var(--transition-fast);
  cursor: pointer;
  box-shadow: 0 4px 20px rgba(0,212,170,0.3);
}
.back-to-top.show { opacity: 1; transform: translateY(0); }
.back-to-top:hover { transform: translateY(-3px); }

/* ============================================================
   RESPONSIVE UTILITIES
   ============================================================ */
@media (max-width: 480px) {
  .cards-grid { grid-template-columns: 1fr; }
  .hero-content h1 { font-size: 2rem; }
  .section-padding { padding: 60px 0; }
  .stats-row { grid-template-columns: 1fr; }
  .book-card .card-body { flex-direction: column; }
  .book-card .book-cover { width: 80px; min-width: 80px; height: 110px; }
}