.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-md);
  z-index: 1000;
  padding: var(--space-sm) var(--space-md);
  background: var(--accent-purple);
  color: #fff;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: var(--space-md);
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-lg);
}

main {
  padding-top: var(--nav-height);
}

.section {
  padding-block: var(--space-section);
}

.section__label {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--accent-purple);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: var(--space-xs);
}

.section__title {
  font-family: var(--font-mono);
  font-size: var(--fs-2xl);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-3xl);
  line-height: 1.1;
}

/* --- Navigation --- */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  background: rgba(5, 5, 16, 0.6);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border);
}

.nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__logo {
  font-family: var(--font-mono);
  font-size: var(--fs-lg);
  font-weight: 700;
  color: var(--text-primary);
}

.nav__logo span {
  color: var(--accent-purple);
}

.nav__links {
  display: flex;
  gap: var(--space-lg);
  align-items: center;
}

.nav__link {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--text-tertiary);
  text-transform: lowercase;
  letter-spacing: 0.03em;
  padding-block: var(--space-xs);
  position: relative;
  transition: color 0.3s ease;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-brand);
  transition: width 0.3s ease;
  border-radius: 1px;
}

.nav__link:hover,
.nav__link.active {
  color: var(--text-primary);
}

.nav__link:hover::after,
.nav__link.active::after {
  width: 100%;
}

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-xs);
}

.nav__toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.nav__overlay {
  position: fixed;
  inset: 0;
  background: rgba(5, 5, 16, 0.7);
  backdrop-filter: blur(4px);
  z-index: 99;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.nav__overlay.visible {
  opacity: 1;
  pointer-events: auto;
}

/* --- Hero --- */

.hero {
  min-height: calc(100vh - var(--nav-height));
  display: flex;
  align-items: center;
  position: relative;
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: 800px;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--accent-green);
  padding: 6px 14px;
  border: 1px solid rgba(34, 197, 94, 0.2);
  border-radius: 100px;
  margin-bottom: var(--space-xl);
  background: rgba(34, 197, 94, 0.06);
}

.hero__badge .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-green);
  animation: pulse-dot 2s ease-in-out infinite;
}

.hero__name {
  font-family: var(--font-mono);
  font-size: var(--fs-hero);
  font-weight: 700;
  line-height: 1.05;
  margin-bottom: var(--space-lg);
}

.hero__subtitle {
  font-size: var(--fs-lg);
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 600px;
  margin-bottom: var(--space-2xl);
}

.hero__subtitle em {
  font-style: normal;
  color: var(--accent-purple);
}

.hero__cta {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

/* --- Buttons --- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  padding: 12px 24px;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.btn--primary {
  background: var(--gradient-brand);
  color: #fff;
  font-weight: 600;
  border: none;
}

.btn--primary::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.15) 0%, transparent 50%);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.btn--primary:hover::before {
  opacity: 1;
}

.btn--primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 30px rgba(168, 85, 247, 0.3);
}

.btn--glass {
  background: var(--bg-surface);
  color: var(--text-secondary);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(12px);
}

.btn--glass:hover {
  color: var(--text-primary);
  border-color: var(--glass-border-hover);
  background: var(--bg-surface-hover);
  transform: translateY(-1px);
}

/* --- Bento Grid (About) --- */

.bento-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-auto-rows: auto;
  gap: var(--space-md);
}

.bento-item {
  background: var(--bg-surface);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  backdrop-filter: blur(12px);
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
  position: relative;
  overflow: hidden;
}

.bento-item::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--glass-shine);
  pointer-events: none;
}

.bento-item:hover {
  border-color: var(--glass-border-hover);
}

.bento-item--bio {
  grid-column: 1 / 3;
  grid-row: 1 / 3;
  display: flex;
  flex-direction: column;
}

.bento-item--wide {
  grid-column: span 2;
}

.bento__emoji {
  font-size: 1.6rem;
  margin-bottom: var(--space-sm);
}

.bento__label {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 4px;
}

.bento__value {
  font-size: var(--fs-md);
  color: var(--text-primary);
  font-weight: 500;
}

.bento__avatar-wrap {
  width: 80px;
  height: 80px;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 2px solid var(--glass-border);
  margin-bottom: var(--space-lg);
  flex-shrink: 0;
}

.bento__avatar-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.bento__bio-title {
  font-family: var(--font-mono);
  font-size: var(--fs-lg);
  color: var(--text-primary);
  margin-bottom: var(--space-md);
}

.bento__bio-text {
  color: var(--text-secondary);
  line-height: 1.7;
  font-size: var(--fs-base);
}

.bento__bio-text strong {
  color: var(--text-primary);
}

.bento__meter {
  font-family: var(--font-mono);
  font-size: var(--fs-md);
  color: var(--accent-amber);
  letter-spacing: 2px;
}

.bento__music {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.bento__music-bars {
  display: flex;
  align-items: flex-end;
  gap: 3px;
  height: 20px;
}

.bento__music-bar {
  width: 3px;
  background: var(--accent-green);
  border-radius: 2px;
  animation: music-bar 1.2s ease-in-out infinite;
}

.bento__music-bar:nth-child(1) { height: 40%; animation-delay: 0s; }
.bento__music-bar:nth-child(2) { height: 70%; animation-delay: 0.15s; }
.bento__music-bar:nth-child(3) { height: 50%; animation-delay: 0.3s; }
.bento__music-bar:nth-child(4) { height: 80%; animation-delay: 0.45s; }

@keyframes music-bar {
  0%, 100% { transform: scaleY(1); }
  50% { transform: scaleY(0.4); }
}

/* --- Skills (horizontal scroll marquee + categorized) --- */

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-xl);
}

.skill-group {
  background: var(--bg-surface);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  backdrop-filter: blur(12px);
  position: relative;
  overflow: hidden;
  transition: border-color 0.3s ease;
}

.skill-group::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--glass-shine);
  pointer-events: none;
}

.skill-group:hover {
  border-color: var(--glass-border-hover);
}

.skill-group__icon {
  font-size: 1.4rem;
  margin-bottom: var(--space-sm);
}

.skill-group__title {
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  color: var(--text-primary);
  margin-bottom: var(--space-md);
  font-weight: 600;
}

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

.skill-tag {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  padding: 5px 12px;
  border-radius: 100px;
  border: 1px solid var(--glass-border);
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.02);
  transition: all 0.25s ease;
  cursor: default;
}

.skill-tag:hover {
  color: var(--text-primary);
  border-color: var(--accent-purple);
  background: var(--accent-purple-dim);
  transform: translateY(-1px);
}

/* --- Project Cards --- */

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-lg);
}

.card {
  background: var(--bg-surface);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  backdrop-filter: blur(12px);
  position: relative;
  overflow: hidden;
  transition: border-color 0.4s ease, box-shadow 0.4s ease;
  transform-style: preserve-3d;
}

.card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--glass-shine);
  pointer-events: none;
}

.card:hover {
  border-color: var(--glass-border-hover);
  box-shadow: 0 8px 40px rgba(168, 85, 247, 0.08);
}

.card__number {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--text-muted);
  margin-bottom: var(--space-md);
}

.card__title {
  font-family: var(--font-mono);
  font-size: var(--fs-md);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
}

.card__desc {
  font-size: var(--fs-sm);
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-lg);
}

.card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: var(--space-lg);
}

.card__tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 3px 10px;
  border-radius: 100px;
  background: var(--accent-purple-dim);
  color: var(--accent-purple);
}

.card__links {
  display: flex;
  gap: var(--space-md);
  padding-top: var(--space-md);
  border-top: 1px solid var(--glass-border);
}

.card__link {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--text-tertiary);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: color 0.2s ease;
}

.card__link:hover {
  color: var(--accent-cyan);
}

/* --- Filter Tabs --- */

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-2xl);
}

.filter-btn {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  padding: 8px 18px;
  border: 1px solid var(--glass-border);
  border-radius: 100px;
  background: transparent;
  color: var(--text-tertiary);
  cursor: pointer;
  transition: all 0.25s ease;
}

.filter-btn:hover,
.filter-btn.active {
  border-color: var(--accent-purple);
  color: var(--accent-purple);
  background: var(--accent-purple-dim);
}

/* --- Writeups --- */

.writeups-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.writeup-row {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: var(--space-md);
  align-items: center;
  padding: var(--space-lg) var(--space-xl);
  background: var(--bg-surface);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  transition: border-color 0.3s ease, transform 0.2s ease;
}

.writeup-row:hover {
  border-color: var(--glass-border-hover);
  transform: translateX(4px);
}

.writeup-row__title {
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  color: var(--text-primary);
  font-weight: 500;
}

.writeup-row__event {
  font-size: var(--fs-xs);
  color: var(--text-tertiary);
  margin-top: 2px;
}

.writeup-row__badge {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 3px 10px;
  border-radius: 100px;
  font-weight: 500;
}

.writeup-row__badge--web { background: var(--accent-cyan-dim); color: var(--accent-cyan); }
.writeup-row__badge--pwn { background: var(--accent-pink-dim); color: var(--accent-pink); }
.writeup-row__badge--crypto { background: var(--accent-purple-dim); color: var(--accent-purple); }
.writeup-row__badge--forensics { background: var(--accent-green-dim); color: var(--accent-green); }

.writeup-row__arrow {
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  color: var(--text-muted);
  transition: color 0.2s ease, transform 0.2s ease;
}

.writeup-row:hover .writeup-row__arrow {
  color: var(--accent-purple);
  transform: translateX(4px);
}

/* --- Certifications --- */

.certs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: var(--space-md);
}

.cert-card {
  background: var(--bg-surface);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  text-align: center;
  backdrop-filter: blur(12px);
  transition: border-color 0.3s ease, transform 0.3s ease;
  position: relative;
  overflow: hidden;
}

.cert-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--glass-shine);
  pointer-events: none;
}

.cert-card:hover {
  border-color: var(--accent-purple);
  transform: translateY(-2px);
}

.cert-card__icon {
  font-size: 2rem;
  margin-bottom: var(--space-sm);
}

.cert-card__name {
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  color: var(--text-primary);
  font-weight: 600;
  margin-bottom: 4px;
}

.cert-card__issuer {
  font-size: var(--fs-xs);
  color: var(--text-secondary);
}

.cert-card__year {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--text-muted);
  margin-top: var(--space-xs);
}

/* --- Timeline --- */

.timeline {
  position: relative;
  padding-left: 36px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent-cyan), var(--accent-purple), var(--accent-pink));
  opacity: 0.3;
  border-radius: 2px;
}

.timeline__item {
  position: relative;
  padding-bottom: var(--space-3xl);
}

.timeline__item:last-child {
  padding-bottom: 0;
}

.timeline__dot {
  position: absolute;
  left: -32px;
  top: 6px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--bg-primary);
  border: 2px solid var(--accent-purple);
  z-index: 1;
  transition: background 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.timeline__item:hover .timeline__dot {
  background: var(--accent-purple);
  box-shadow: 0 0 12px rgba(168, 85, 247, 0.4);
}

.timeline__year {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--accent-purple);
  margin-bottom: 4px;
}

.timeline__role {
  font-family: var(--font-mono);
  font-size: var(--fs-md);
  color: var(--text-primary);
  font-weight: 600;
  margin-bottom: 4px;
}

.timeline__org {
  font-size: var(--fs-sm);
  color: var(--text-secondary);
  margin-bottom: var(--space-xs);
}

.timeline__desc {
  font-size: var(--fs-sm);
  color: var(--text-tertiary);
  max-width: 550px;
  line-height: 1.6;
}

/* --- Contact --- */

.contact-section {
  text-align: center;
}

.contact-section .section__title {
  display: inline-block;
}

.contact__text {
  font-size: var(--fs-lg);
  color: var(--text-secondary);
  max-width: 520px;
  margin-inline: auto;
  margin-bottom: var(--space-2xl);
  line-height: 1.6;
}

.contact__links {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  flex-wrap: wrap;
  margin-bottom: var(--space-xl);
}

.contact__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  color: var(--text-tertiary);
  padding: 10px 20px;
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  backdrop-filter: blur(12px);
  background: var(--bg-surface);
  transition: all 0.25s ease;
}

.contact__link:hover {
  color: var(--text-primary);
  border-color: var(--accent-purple);
  background: var(--accent-purple-dim);
  transform: translateY(-2px);
}

.contact__status {
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  color: var(--accent-green);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

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

/* --- Footer --- */

.footer {
  border-top: 1px solid var(--glass-border);
  padding: var(--space-xl) 0;
  text-align: center;
}

.footer__text {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--text-muted);
}

.footer__text a {
  color: var(--text-tertiary);
  transition: color 0.2s ease;
}

.footer__text a:hover {
  color: var(--accent-purple);
}

/* --- Fun scrolling marquee --- */

.marquee-section {
  border-top: 1px solid var(--glass-border);
  border-bottom: 1px solid var(--glass-border);
  padding: var(--space-lg) 0;
  overflow: hidden;
  position: relative;
}

.marquee-track {
  display: flex;
  gap: var(--space-2xl);
  animation: marquee 40s linear infinite;
  width: max-content;
}

.marquee-item {
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  color: var(--text-muted);
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.marquee-item .sep {
  color: var(--accent-purple);
}

@keyframes marquee {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

/* --- Mobile --- */

@media (max-width: 768px) {
  .nav__links {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: min(300px, 85vw);
    flex-direction: column;
    background: var(--bg-surface-solid);
    border-left: 1px solid var(--glass-border);
    padding: calc(var(--nav-height) + var(--space-xl)) var(--space-xl) var(--space-xl);
    gap: var(--space-md);
    transform: translateX(100%);
    transition: transform 0.3s ease;
    backdrop-filter: blur(24px);
  }

  .nav__links.open {
    transform: translateX(0);
  }

  .nav__toggle {
    display: flex;
  }

  .nav__toggle[aria-expanded="true"] span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }

  .nav__toggle[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
  }

  .nav__toggle[aria-expanded="true"] span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }

  .bento-grid {
    grid-template-columns: 1fr 1fr;
  }

  .bento-item--bio {
    grid-column: 1 / -1;
    grid-row: auto;
  }

  .bento-item--wide {
    grid-column: 1 / -1;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }

  .writeup-row {
    grid-template-columns: 1fr;
    gap: var(--space-xs);
  }

  .writeup-row__badge {
    justify-self: start;
  }

  .writeup-row__arrow {
    display: none;
  }

  .skills-grid {
    grid-template-columns: 1fr;
  }

  .certs-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .marquee-section {
    display: none;
  }
}

@media (max-width: 480px) {
  .bento-grid {
    grid-template-columns: 1fr;
  }

  .certs-grid {
    grid-template-columns: 1fr;
  }
}