/* Gavin Morris Portfolio — styles */
:root {
  --bg: #080b14;
  --bg-elevated: #0f1424;
  --surface: rgba(255, 255, 255, 0.04);
  --border: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(99, 179, 237, 0.35);
  --text: #e8edf5;
  --text-muted: #8b9cb8;
  --text-dim: #5c6d88;
  --accent: #3b82f6;
  --accent-2: #6366f1;
  --accent-3: #22d3ee;
  --gold: #f59e0b;
  --font-sans: "DM Sans", system-ui, sans-serif;
  --font-display: "Instrument Serif", Georgia, serif;
  --nav-h: 72px;
  --radius: 16px;
  --radius-lg: 24px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --shadow: 0 24px 48px rgba(0, 0, 0, 0.35);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-h);
}

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

::selection {
  background: rgba(59, 130, 246, 0.35);
  color: #fff;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { font: inherit; cursor: pointer; border: none; background: none; color: inherit; }
ul { list-style: none; }

/* Background */
.bg-layer {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.bg-mesh {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 20% -10%, rgba(59, 130, 246, 0.18), transparent),
    radial-gradient(ellipse 60% 40% at 90% 20%, rgba(99, 102, 241, 0.12), transparent),
    radial-gradient(ellipse 50% 30% at 50% 100%, rgba(34, 211, 238, 0.08), transparent),
    var(--bg);
}

.bg-grid {
  position: absolute;
  inset: 0;
  opacity: 0.04;
  background-image:
    linear-gradient(rgba(255,255,255,0.5) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.5) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 30%, black, transparent);
}

#particle-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0.5;
}

/* Progress */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  width: 100%;
  z-index: 200;
  transform-origin: left;
  transform: scaleX(0);
  background: linear-gradient(90deg, var(--accent), var(--accent-2), var(--accent-3));
  box-shadow: 0 0 12px rgba(59, 130, 246, 0.6);
}

/* Nav */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-h);
  transition: background 0.4s var(--ease), border-color 0.4s, backdrop-filter 0.4s;
}

.nav.scrolled {
  background: rgba(8, 11, 20, 0.85);
  backdrop-filter: blur(20px) saturate(1.4);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-style: italic;
  color: var(--text);
  transition: opacity 0.3s;
}

.logo:hover { opacity: 0.8; }

.nav-links {
  display: none;
  align-items: center;
  gap: 0.25rem;
}

@media (min-width: 1024px) {
  .nav-links { display: flex; }
}

.nav-link {
  padding: 0.5rem 0.875rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
  border-radius: 8px;
  transition: color 0.25s, background 0.25s;
  position: relative;
}

.nav-link:hover,
.nav-link.active {
  color: var(--text);
}

.nav-link.active {
  background: rgba(59, 130, 246, 0.12);
}

.nav-cta {
  display: none;
  padding: 0.5rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  border-radius: 999px;
  transition: transform 0.25s var(--ease), box-shadow 0.25s;
}

@media (min-width: 1024px) {
  .nav-cta { display: inline-flex; }
}

.nav-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 24px rgba(59, 130, 246, 0.35);
}

.menu-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--surface);
}

@media (min-width: 1024px) {
  .menu-toggle { display: none; }
}

.mobile-drawer {
  position: fixed;
  top: var(--nav-h);
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 99;
  background: rgba(8, 11, 20, 0.97);
  backdrop-filter: blur(24px);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  transform: translateX(100%);
  transition: transform 0.4s var(--ease);
}

.mobile-drawer.open { transform: translateX(0); }

.mobile-drawer .nav-link {
  font-size: 1.125rem;
  padding: 1rem;
  border-radius: 12px;
}

/* Layout */
main { position: relative; z-index: 1; }

.section {
  padding: 5rem 1.5rem;
  max-width: 1200px;
  margin: 0 auto;
}

.section-wide { max-width: 1280px; }

.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-3);
  margin-bottom: 0.75rem;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(2.25rem, 5vw, 3.5rem);
  font-weight: 400;
  line-height: 1.15;
  color: var(--text);
  margin-bottom: 1rem;
}

.section-desc {
  font-size: 1.0625rem;
  color: var(--text-muted);
  max-width: 36rem;
  line-height: 1.75;
}

.section-header {
  margin-bottom: 3.5rem;
}

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

.section-header.center .section-desc {
  margin: 0 auto;
}

/* Hero */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: calc(var(--nav-h) + 3rem) 1.5rem 4rem;
  max-width: 1200px;
  margin: 0 auto;
  position: relative;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.375rem 1rem 0.375rem 0.75rem;
  border-radius: 999px;
  background: rgba(34, 197, 94, 0.1);
  border: 1px solid rgba(34, 197, 94, 0.25);
  font-size: 0.8125rem;
  font-weight: 500;
  color: #4ade80;
  width: fit-content;
  margin-bottom: 2rem;
}

.hero-badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #4ade80;
  animation: pulse-dot 2s ease infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; box-shadow: 0 0 0 0 rgba(74, 222, 128, 0.5); }
  50% { opacity: 0.85; box-shadow: 0 0 0 6px rgba(74, 222, 128, 0); }
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(3.5rem, 10vw, 6.5rem);
  font-weight: 400;
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin-bottom: 1.25rem;
}

.hero-title .line {
  display: block;
}

.hero-title .accent {
  font-style: italic;
  background: linear-gradient(135deg, #93c5fd, #a5b4fc, #67e8f9);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-role {
  font-size: clamp(1.125rem, 2.5vw, 1.5rem);
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  min-height: 2rem;
}

.hero-role .cursor {
  display: inline-block;
  width: 2px;
  height: 1.1em;
  background: var(--accent-3);
  margin-left: 2px;
  vertical-align: text-bottom;
  animation: blink 1s step-end infinite;
}

@keyframes blink {
  50% { opacity: 0; }
}

.hero-bio {
  font-size: 1.0625rem;
  color: var(--text-dim);
  max-width: 32rem;
  line-height: 1.8;
  margin-bottom: 2.5rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 3rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.875rem 1.75rem;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: 999px;
  transition: transform 0.3s var(--ease), box-shadow 0.3s, background 0.3s, border-color 0.3s;
}

.btn-primary {
  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 4px 20px rgba(59, 130, 246, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(59, 130, 246, 0.45);
}

.btn-outline {
  color: var(--text);
  border: 1px solid var(--border);
  background: var(--surface);
  backdrop-filter: blur(8px);
}

.btn-outline:hover {
  border-color: var(--border-hover);
  background: rgba(255, 255, 255, 0.06);
  transform: translateY(-2px);
}

.hero-contact {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem 2rem;
}

.hero-contact a {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--text-muted);
  transition: color 0.25s;
}

.hero-contact a:hover { color: var(--accent-3); }

.hero-contact svg {
  width: 18px;
  height: 18px;
  opacity: 0.7;
}

.scroll-hint {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  color: var(--text-dim);
  animation: float 2.5s ease-in-out infinite;
  cursor: pointer;
}

@keyframes float {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(8px); }
}

/* Stats */
.stats-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

@media (min-width: 640px) {
  .stats-row { grid-template-columns: repeat(4, 1fr); }
}

.stat-card {
  padding: 1.5rem;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--border);
  text-align: center;
  transition: border-color 0.35s, transform 0.35s var(--ease);
}

.stat-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
}

.stat-num {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-style: italic;
  background: linear-gradient(135deg, #93c5fd, #a5b4fc);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1.2;
}

.stat-label {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

/* About grid */
.about-grid {
  display: grid;
  gap: 3rem;
}

@media (min-width: 1024px) {
  .about-grid {
    grid-template-columns: 1.2fr 1fr;
    align-items: start;
  }
}

/* Education */
.edu-card {
  padding: 2rem;
  border-radius: var(--radius-lg);
  background: linear-gradient(145deg, rgba(59, 130, 246, 0.08), rgba(99, 102, 241, 0.04));
  border: 1px solid var(--border);
  margin-top: 2rem;
  position: relative;
  overflow: hidden;
}

.edu-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--gold), var(--accent));
}

.edu-school {
  font-family: var(--font-display);
  font-size: 1.75rem;
  margin-bottom: 0.5rem;
}

.edu-degree {
  font-size: 1.0625rem;
  color: var(--text);
  margin-bottom: 0.25rem;
}

.edu-minor {
  color: var(--text-muted);
  margin-bottom: 1.25rem;
}

.edu-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.5rem;
  font-size: 0.875rem;
  color: var(--text-dim);
}

.edu-meta span {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
}

/* Experience */
.timeline {
  position: relative;
  padding-left: 2rem;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--accent), var(--accent-2), transparent);
}

.exp-card {
  position: relative;
  margin-bottom: 2.5rem;
  padding: 2rem;
  border-radius: var(--radius-lg);
  background: var(--surface);
  border: 1px solid var(--border);
  transition: border-color 0.35s, transform 0.4s var(--ease), box-shadow 0.4s;
}

.exp-card:last-child { margin-bottom: 0; }

.exp-card::before {
  content: "";
  position: absolute;
  left: -2rem;
  top: 2rem;
  width: 14px;
  height: 14px;
  margin-left: -6px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  border: 3px solid var(--bg);
  box-shadow: 0 0 16px rgba(59, 130, 246, 0.5);
}

.exp-card:hover {
  border-color: var(--border-hover);
  transform: translateX(6px);
  box-shadow: var(--shadow);
}

.exp-date {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--accent-3);
  letter-spacing: 0.04em;
  margin-bottom: 0.5rem;
}

.exp-role {
  font-size: 1.375rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.exp-company {
  font-size: 1rem;
  font-weight: 600;
  color: var(--gold);
  margin-bottom: 1.25rem;
}

.exp-bullets li {
  position: relative;
  padding-left: 1.25rem;
  margin-bottom: 0.75rem;
  font-size: 0.9375rem;
  color: var(--text-muted);
  line-height: 1.7;
}

.exp-bullets li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
}

.exp-tag {
  display: inline-block;
  margin-top: 1rem;
  padding: 0.25rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  border-radius: 6px;
  background: rgba(245, 158, 11, 0.12);
  color: var(--gold);
  border: 1px solid rgba(245, 158, 11, 0.25);
}

/* Project filters */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.filter-btn {
  padding: 0.5rem 1.125rem;
  font-size: 0.8125rem;
  font-weight: 600;
  border-radius: 999px;
  color: var(--text-muted);
  border: 1px solid var(--border);
  background: transparent;
  transition: all 0.3s var(--ease);
}

.filter-btn:hover,
.filter-btn.active {
  color: #fff;
  background: rgba(59, 130, 246, 0.2);
  border-color: rgba(59, 130, 246, 0.4);
}

.projects-grid {
  display: grid;
  gap: 1.5rem;
}

@media (min-width: 768px) {
  .projects-grid { grid-template-columns: repeat(2, 1fr); }
}

.project-card {
  border-radius: var(--radius-lg);
  background: var(--surface);
  border: 1px solid var(--border);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: border-color 0.35s, transform 0.4s var(--ease), box-shadow 0.4s;
  opacity: 1;
  transform: scale(1);
}

.project-card.hidden {
  display: none;
}

.project-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-6px);
  box-shadow: var(--shadow);
}

.project-top {
  height: 4px;
  background: linear-gradient(90deg, var(--accent), var(--accent-3));
}

.project-card[data-category="ml"] .project-top {
  background: linear-gradient(90deg, #8b5cf6, #ec4899);
}

.project-card[data-category="mobile"] .project-top {
  background: linear-gradient(90deg, var(--gold), #fbbf24);
}

.project-card[data-category="fullstack"] .project-top {
  background: linear-gradient(90deg, var(--accent), var(--accent-3));
}

.project-body {
  padding: 1.75rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.project-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.project-date {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-dim);
}

.project-cat {
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-3);
}

.project-name {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 1rem;
  transition: color 0.25s;
}

.project-card:hover .project-name { color: #93c5fd; }

.project-bullets {
  flex: 1;
  margin-bottom: 1.5rem;
}

.project-bullets li {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 0.625rem;
  padding-left: 1rem;
  position: relative;
}

.project-bullets li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-size: 0.75rem;
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--accent-3);
  transition: gap 0.25s;
}

.project-link:hover { gap: 0.75rem; }

/* Skills */
.skills-grid {
  display: grid;
  gap: 1.5rem;
}

@media (min-width: 768px) {
  .skills-grid { grid-template-columns: repeat(3, 1fr); }
}

.skill-group {
  padding: 2rem;
  border-radius: var(--radius-lg);
  background: var(--surface);
  border: 1px solid var(--border);
  transition: transform 0.4s var(--ease), border-color 0.35s;
}

.skill-group:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
}

.skill-group h3 {
  font-size: 1.125rem;
  font-weight: 700;
  color: #93c5fd;
  margin-bottom: 1.25rem;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.skill-tag {
  padding: 0.4375rem 0.875rem;
  font-size: 0.8125rem;
  font-weight: 500;
  border-radius: 8px;
  background: rgba(59, 130, 246, 0.1);
  border: 1px solid rgba(59, 130, 246, 0.18);
  color: #93c5fd;
  transition: transform 0.25s, background 0.25s;
}

.skill-tag:hover {
  transform: translateY(-2px);
  background: rgba(59, 130, 246, 0.18);
}

/* Certifications */
.certs-grid {
  display: grid;
  gap: 1.25rem;
}

@media (min-width: 640px) {
  .certs-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1024px) {
  .certs-grid { grid-template-columns: repeat(3, 1fr); }
}

.cert-card {
  perspective: 1000px;
  height: 200px;
}

.cert-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.6s var(--ease);
  transform-style: preserve-3d;
}

.cert-card:hover .cert-inner,
.cert-card.flipped .cert-inner {
  transform: rotateY(180deg);
}

.cert-front,
.cert-back {
  position: absolute;
  inset: 0;
  padding: 1.5rem;
  border-radius: var(--radius);
  backface-visibility: hidden;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  border: 1px solid var(--border);
  background: var(--surface);
}

.cert-back {
  transform: rotateY(180deg);
  background: rgba(59, 130, 246, 0.08);
}

.cert-issuer {
  font-size: 0.6875rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  color: var(--accent-3);
  margin-bottom: 0.75rem;
}

.cert-name {
  font-size: 0.9375rem;
  font-weight: 600;
  line-height: 1.45;
  color: var(--text);
}

.cert-id {
  font-family: ui-monospace, monospace;
  font-size: 0.75rem;
  color: var(--text-dim);
  word-break: break-all;
}

.cert-hint {
  font-size: 0.6875rem;
  color: var(--text-dim);
  margin-top: 0.75rem;
}

/* Involvement */
.involve-grid {
  display: grid;
  gap: 1.25rem;
}

@media (min-width: 640px) {
  .involve-grid { grid-template-columns: repeat(2, 1fr); }
}

.involve-card {
  padding: 1.75rem;
  border-radius: var(--radius-lg);
  background: var(--surface);
  border: 1px solid var(--border);
  transition: border-color 0.35s, transform 0.4s var(--ease);
}

.involve-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
}

.involve-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  background: rgba(59, 130, 246, 0.12);
  color: #93c5fd;
  margin-bottom: 1.25rem;
}

.involve-icon svg { width: 22px; height: 22px; }

.involve-org {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 0.375rem;
}

.involve-role {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--gold);
  margin-bottom: 0.75rem;
}

.involve-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* Contact */
.contact-grid {
  display: grid;
  gap: 1rem;
}

@media (min-width: 640px) {
  .contact-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 900px) {
  .contact-grid { grid-template-columns: repeat(4, 1fr); }
}

.contact-card {
  padding: 2rem 1.5rem;
  border-radius: var(--radius-lg);
  background: var(--surface);
  border: 1px solid var(--border);
  text-align: center;
  transition: transform 0.4s var(--ease), border-color 0.35s;
}

.contact-card:hover {
  transform: translateY(-6px) scale(1.02);
  border-color: var(--border-hover);
}

.contact-card svg {
  width: 32px;
  height: 32px;
  color: var(--text-dim);
  margin: 0 auto 1rem;
  transition: color 0.3s;
}

.contact-card:hover svg { color: var(--accent-3); }

.contact-type {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-3);
  margin-bottom: 0.375rem;
}

.contact-val {
  font-size: 0.875rem;
  color: var(--text-muted);
  word-break: break-word;
}

/* Footer */
.footer {
  padding: 3rem 1.5rem;
  text-align: center;
  border-top: 1px solid var(--border);
  color: var(--text-dim);
  font-size: 0.875rem;
  position: relative;
  z-index: 1;
}

/* Back to top */
.back-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 90;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 24px rgba(59, 130, 246, 0.4);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 0.35s, visibility 0.35s, transform 0.35s var(--ease);
}

.back-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-top:hover { transform: translateY(-3px); }

.back-top svg { width: 20px; height: 20px; }

/* Reveal animations */
.reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

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

.reveal-left {
  opacity: 0;
  transform: translateX(-40px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

.reveal-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.reveal-right {
  opacity: 0;
  transform: translateX(40px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

.reveal-right.visible {
  opacity: 1;
  transform: translateX(0);
}

.stagger > *:nth-child(1) { transition-delay: 0ms; }
.stagger > *:nth-child(2) { transition-delay: 80ms; }
.stagger > *:nth-child(3) { transition-delay: 160ms; }
.stagger > *:nth-child(4) { transition-delay: 240ms; }
.stagger > *:nth-child(5) { transition-delay: 320ms; }
.stagger > *:nth-child(6) { transition-delay: 400ms; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal, .reveal-left, .reveal-right {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .cert-inner { transition: none; }
  .cert-card:hover .cert-inner { transform: none; }
}