/* ── TOKENS ── */
:root {
  --bg: #ffffff;
  --bg2: #f7f7f7;
  --surface: #f0f0f0;
  --surface2: #e8e8e8;
  --border: rgba(0,0,0,0.1);
  --border-strong: rgba(0,0,0,0.2);
  --text: #0a0a0a;
  --text2: #555555;
  --text3: #999999;
  --inv: #0a0a0a;
  --inv-text: #ffffff;
  --font-serif: 'Cormorant Garamond', Georgia, serif;
  --font-sans: 'DM Sans', sans-serif;
  --r: 12px;
}
[data-theme="dark"] {
  --bg: #0a0a0a;
  --bg2: #111111;
  --surface: #1a1a1a;
  --surface2: #222222;
  --border: rgba(255,255,255,0.08);
  --border-strong: rgba(255,255,255,0.18);
  --text: #f5f5f5;
  --text2: #999999;
  --text3: #555555;
  --inv: #f5f5f5;
  --inv-text: #0a0a0a;
}

/* ── RESET ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-weight: 300;
  line-height: 1.7;
  overflow-x: hidden;
  transition: background 0.35s, color 0.35s;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }

/* ── CUSTOM CURSOR ── */
.cursor {
  position: fixed; width: 10px; height: 10px;
  background: var(--text); border-radius: 50%;
  pointer-events: none; z-index: 9999;
  transform: translate(-50%, -50%);
  transition: transform 0.1s, width 0.2s, height 0.2s, opacity 0.2s;
}
.cursor-trail {
  position: fixed; width: 36px; height: 36px;
  border: 1px solid var(--border-strong); border-radius: 50%;
  pointer-events: none; z-index: 9998;
  transform: translate(-50%, -50%);
  transition: left 0.12s ease, top 0.12s ease, width 0.3s, height 0.3s;
}
body:has(a:hover) .cursor, body:has(button:hover) .cursor { width: 16px; height: 16px; opacity: 0.6; }
body:has(a:hover) .cursor-trail, body:has(button:hover) .cursor-trail { width: 54px; height: 54px; }
@media (pointer: coarse) { .cursor, .cursor-trail { display: none; } }

/* ── NAV ── */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  padding: 0 2.5rem;
  transition: background 0.3s, border-color 0.3s;
}
.nav.scrolled {
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 1160px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  height: 70px;
}
.nav-logo {
  font-family: var(--font-serif); font-size: 1.5rem;
  font-weight: 600; letter-spacing: -0.5px;
}
.dot { opacity: 0.4; }
.nav-links { display: flex; gap: 2.2rem; list-style: none; }
.nav-links a {
  font-size: 0.82rem; color: var(--text2); font-weight: 400;
  letter-spacing: 0.05em; text-transform: uppercase;
  position: relative; transition: color 0.2s;
}
.nav-links a::after {
  content: ''; position: absolute; bottom: -3px; left: 0;
  width: 0; height: 1px; background: var(--text);
  transition: width 0.3s cubic-bezier(0.4,0,0.2,1);
}
.nav-links a:hover { color: var(--text); }
.nav-links a:hover::after { width: 100%; }
.nav-right { display: flex; align-items: center; gap: 1rem; }
.theme-toggle {
  width: 40px; height: 40px; border-radius: 50%;
  border: 1px solid var(--border-strong); background: transparent;
  cursor: pointer; display: flex; align-items: center; justify-content: center;
  font-size: 1rem; color: var(--text);
  transition: background 0.2s, transform 0.3s;
}
.theme-toggle:hover { background: var(--surface); transform: rotate(20deg); }
[data-theme="light"] .theme-icon-dark { display: none; }
[data-theme="dark"] .theme-icon-light { display: none; }
.nav-cta {
  font-size: 0.78rem; letter-spacing: 0.08em; text-transform: uppercase;
  font-weight: 500; padding: 0.5rem 1.2rem;
  border: 1px solid var(--border-strong);
  transition: background 0.2s, color 0.2s;
}
.nav-cta:hover { background: var(--text); color: var(--bg); }
.nav-burger {
  display: none; flex-direction: column; gap: 5px;
  background: none; border: none; cursor: pointer; padding: 4px;
}
.nav-burger span { display: block; width: 22px; height: 1px; background: var(--text); transition: 0.3s; }
.mobile-menu {
  display: none; flex-direction: column; gap: 1.2rem;
  padding: 1.5rem 0; border-top: 1px solid var(--border);
}
.mobile-menu.open { display: flex; }
.mobile-menu a { font-size: 0.9rem; color: var(--text2); }

/* ── HERO ── */
.hero {
  min-height: 100vh; display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  padding: 9rem 2.5rem 5rem; position: relative; overflow: hidden;
}
.hero-grid-bg {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 70% 70% at 50% 50%, black 0%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 70% 70% at 50% 50%, black 0%, transparent 100%);
}
.hero-content {
  position: relative; z-index: 2;
  display: grid; grid-template-columns: 1fr auto;
  gap: 5rem; max-width: 1160px; width: 100%;
  align-items: center;
}
.hero-eyebrow {
  display: flex; align-items: center; gap: 0.8rem;
  font-size: 0.75rem; letter-spacing: 0.15em; text-transform: uppercase;
  color: var(--text3); font-weight: 400; margin-bottom: 1.8rem;
}
.eyebrow-line { display: block; width: 32px; height: 1px; background: var(--text3); }
.hero-name {
  font-family: var(--font-serif); font-size: clamp(4rem, 9vw, 7.5rem);
  font-weight: 300; line-height: 0.95; letter-spacing: -3px;
  margin-bottom: 1.5rem;
}
.hero-name em { font-style: italic; font-weight: 300; }
.hero-subtitle {
  font-size: 1.05rem; color: var(--text2); min-height: 1.8em;
  margin-bottom: 1.2rem; font-weight: 300;
}
.hero-subtitle::after { content: '|'; animation: blink 1s step-end infinite; opacity: 0.5; }
@keyframes blink { 0%,100%{opacity:.5} 50%{opacity:0} }
.hero-desc { color: var(--text2); max-width: 480px; margin-bottom: 2.5rem; font-size: 0.95rem; }
.hero-desc strong { color: var(--text); font-weight: 500; }
.hero-actions { display: flex; gap: 1rem; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.75rem 1.8rem; font-size: 0.82rem;
  letter-spacing: 0.08em; text-transform: uppercase; font-weight: 500;
  cursor: pointer; border: none; transition: all 0.22s;
}
.btn-primary { background: var(--text); color: var(--bg); }
.btn-primary:hover { opacity: 0.8; }
.btn-ghost { border: 1px solid var(--border-strong); color: var(--text); }
.btn-ghost:hover { background: var(--text); color: var(--bg); }
.hero-right {
  display: flex; flex-direction: column; gap: 2rem; align-items: center;
}
.hero-avatar-frame {
  position: relative; width: 280px; height: 320px;
  flex-shrink: 0; transition: transform 0.3s;
}
.hero-avatar {
  width: 100%; height: 100%; object-fit: cover;
  filter: grayscale(100%) contrast(1.05);
  transition: filter 0.4s;
}
.hero-avatar:hover { filter: grayscale(100%) contrast(1.1) brightness(0.95); }
.avatar-corner {
  position: absolute; width: 16px; height: 16px;
  border-color: var(--text); border-style: solid; border-width: 0;
}
.avatar-corner.tl { top: -6px; left: -6px; border-top-width: 2px; border-left-width: 2px; }
.avatar-corner.tr { top: -6px; right: -6px; border-top-width: 2px; border-right-width: 2px; }
.avatar-corner.bl { bottom: -6px; left: -6px; border-bottom-width: 2px; border-left-width: 2px; }
.avatar-corner.br { bottom: -6px; right: -6px; border-bottom-width: 2px; border-right-width: 2px; }
.hero-stats-col {
  display: flex; gap: 1.5rem; align-items: center;
}
.hero-stat { text-align: center; }
.hero-stat-num {
  display: inline; font-family: var(--font-serif); font-size: 2rem;
  font-weight: 300; letter-spacing: -1px;
}
.hero-stat-label {
  display: block; font-size: 0.68rem; color: var(--text3);
  text-transform: uppercase; letter-spacing: 0.1em; margin-top: 0.2rem;
}
.hero-stat-divider { width: 1px; height: 36px; background: var(--border-strong); }
.hero-scroll {
  position: absolute; bottom: 2.5rem; left: 50%; transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 0.6rem;
  color: var(--text3); font-size: 0.7rem; letter-spacing: 0.12em; text-transform: uppercase;
  animation: bounce 2.5s ease infinite;
}
.scroll-line {
  width: 1px; height: 48px; background: linear-gradient(180deg, transparent, var(--text3));
  animation: grow 2.5s ease infinite;
}
@keyframes grow { 0%,100%{height:24px;opacity:0} 50%{height:48px;opacity:1} }
@keyframes bounce { 0%,100%{transform:translateX(-50%) translateY(0)} 50%{transform:translateX(-50%) translateY(6px)} }

/* ── SECTION BASE ── */
.section { padding: 7rem 2.5rem; }
.container { max-width: 1160px; margin: 0 auto; }
.section-meta {
  display: flex; align-items: center; gap: 1rem;
  margin-bottom: 3rem;
}
.section-num { font-family: var(--font-serif); font-size: 1.28rem; color: var(--text3); font-style: italic; }
.section-rule { flex: 0 0 40px; height: 1px; background: var(--border-strong); }
.section-label { font-size: 0.72rem; letter-spacing: 0.15em; text-transform: uppercase; color: var(--text3); font-weight: 400; }
.section-title {
  font-family: var(--font-serif); font-size: clamp(2.8rem, 5vw, 4.5rem);
  font-weight: 300; line-height: 1.05; letter-spacing: -1.5px; margin-bottom: 1.5rem;
}
.section-title em { font-style: italic; }
.section-sub { color: var(--text2); max-width: 520px; margin-bottom: 3.5rem; font-size: 0.95rem; }

/* ── ABOUT ── */
.about-section { background: var(--bg2); }
.about-grid { display: grid; grid-template-columns: 280px 1fr; gap: 5rem; align-items: start; }
.about-heading-col .section-title { font-size: clamp(3rem, 6vw, 5.5rem); line-height: 0.95; }
.about-lead { font-size: 1.1rem; color: var(--text); font-weight: 400; margin-bottom: 1.2rem; }
.about-lead strong { font-weight: 500; }
.about-body { color: var(--text2); margin-bottom: 1rem; font-size: 0.95rem; }
.about-chips { display: flex; flex-wrap: wrap; gap: 0.5rem; margin: 1.8rem 0; }
.chip {
  font-size: 0.72rem; letter-spacing: 0.08em; text-transform: uppercase; font-weight: 400;
  padding: 0.4rem 0.9rem; border: 1px solid var(--border-strong);
  transition: background 0.2s, color 0.2s;
}
.chip:hover { background: var(--text); color: var(--bg); cursor: default; }
.about-info-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1.2rem; margin-top: 2rem; }
.info-item { border-top: 1px solid var(--border); padding-top: 0.8rem; }
.info-label { display: block; font-size: 0.68rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--text3); margin-bottom: 0.3rem; }
.info-val { font-size: 0.92rem; font-weight: 400; color: var(--text); }

/* ── SKILLS ── */
.skills-section { background: var(--bg); }
.skills-layout { display: grid; grid-template-columns: 280px 1fr; gap: 5rem; align-items: start; }
.skills-title { margin-bottom: 0; }
.skills-body { display: flex; flex-direction: column; gap: 0; }
.skill-group { padding: 2.2rem 0; }
.skill-group-header { display: flex; align-items: baseline; gap: 1.2rem; margin-bottom: 1.5rem; }
.skill-group-idx { font-family: var(--font-serif); font-size: 0.85rem; color: var(--text3); font-style: italic; }
.skill-group-name { font-family: var(--font-serif); font-size: 1.5rem; font-weight: 400; letter-spacing: -0.5px; }
.skill-tags { display: flex; flex-wrap: wrap; gap: 0.6rem; }
.stag {
  border: 1px solid var(--border-strong); padding: 0.4rem 1rem;
  font-size: 0.82rem; font-weight: 300; color: var(--text2);
  transition: background 0.2s, color 0.2s, border-color 0.2s, transform 0.2s;
  cursor: default;
}
.stag:hover { background: var(--text); color: var(--bg); border-color: var(--text); transform: translateY(-2px); }
.stag-lg { font-size: 1rem; padding: 0.5rem 1.3rem; font-weight: 400; color: var(--text); border-color: var(--border-strong); }
.stag-md { font-size: 0.88rem; }
.stag-sm { font-size: 0.78rem; color: var(--text3); }
.skill-group-divider { height: 1px; background: var(--border); }

/* ── PROJECTS ── */
.projects-section { background: var(--bg2); }
.projects-list { display: flex; flex-direction: column; margin-bottom: 3rem; }
.project-row {
  display: grid; grid-template-columns: 52px 1fr 32px;
  gap: 2rem; align-items: start;
  padding: 2rem 0; border-top: 1px solid var(--border);
  transition: padding-left 0.35s cubic-bezier(0.4,0,0.2,1);
  cursor: pointer;
}
.project-row:last-child { border-bottom: 1px solid var(--border); }
.project-row:hover { padding-left: 1rem; }
.project-row-num {
  font-family: var(--font-serif); font-size: 1.28rem; color: var(--text3);
  font-style: italic; padding-top: 0.25rem;
}
.project-row-top { display: flex; align-items: baseline; gap: 1.5rem; flex-wrap: wrap; margin-bottom: 0.6rem; }
.project-row-title { font-family: var(--font-serif); font-size: 1.5rem; font-weight: 500; letter-spacing: -0.5px; }
.project-row-tags { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.project-row-tags span {
  font-size: 0.68rem; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--text3); padding: 0.15rem 0.6rem; border: 1px solid var(--border);
}
.tag-vibe {
  font-size: 0.68rem; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--text2); padding: 0.15rem 0.6rem;
  border: 1px solid var(--border-strong);
  font-style: italic;
}
.project-row-desc { font-size: 0.88rem; color: var(--text2); line-height: 1.7; }
.project-row-arrow {
  font-size: 1.2rem; color: var(--text3); padding-top: 0.2rem;
  position: relative;
  transition: transform 0.35s cubic-bezier(0.4,0,0.2,1), color 0.2s;
}
.project-row:hover .project-row-arrow { transform: translate(4px,-4px); color: var(--text); }
.project-row-arrow .link-preview {
  display: none; position: absolute; bottom: calc(100% + 8px); right: 0;
  background: var(--text); color: var(--bg);
  font-size: 0.72rem; white-space: nowrap; padding: 0.4rem 0.8rem;
  pointer-events: none; z-index: 50;
  font-family: var(--font-sans); font-style: normal; letter-spacing: 0;
  box-shadow: 0 4px 16px rgba(0,0,0,0.15);
}
.project-row:hover .project-row-arrow .link-preview { display: block; }
.projects-cta { margin-top: 2rem; }

/* ── EDUCATION ── */
.education-section { background: var(--bg); }
.edu-card {
  display: grid; grid-template-columns: 200px 1fr; gap: 3rem;
  padding: 3rem; border: 1px solid var(--border);
  transition: border-color 0.3s;
}
.edu-card:hover { border-color: var(--border-strong); }
.edu-period { font-family: var(--font-serif); font-size: 1.1rem; font-weight: 300; margin-bottom: 0.8rem; }
.edu-badge {
  display: inline-block; font-size: 0.68rem; letter-spacing: 0.1em;
  text-transform: uppercase; padding: 0.25rem 0.7rem;
  border: 1px solid var(--border-strong); color: var(--text3);
}
.edu-degree { font-family: var(--font-serif); font-size: 1.6rem; font-weight: 400; letter-spacing: -0.5px; margin-bottom: 0.4rem; }
.edu-institution { font-size: 0.85rem; letter-spacing: 0.05em; text-transform: uppercase; color: var(--text3); margin-bottom: 1.2rem; font-weight: 400; }
.edu-desc { font-size: 0.92rem; color: var(--text2); line-height: 1.8; margin-bottom: 1.8rem; }
.edu-highlights { display: flex; gap: 2.5rem; flex-wrap: wrap; }
.edu-highlight { border-top: 1px solid var(--border); padding-top: 0.7rem; min-width: 120px; }
.edu-h-label { display: block; font-size: 0.65rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--text3); margin-bottom: 0.3rem; }
.edu-h-val { font-family: var(--font-serif); font-size: 1.05rem; font-weight: 400; }

/* ── CONTACT ── */
.contact-section { background: var(--bg2); }
.contact-list { display: flex; flex-direction: column; }
.contact-row {
  display: flex; align-items: center; gap: 2rem;
  padding: 1.5rem 0; border-top: 1px solid var(--border);
  transition: padding-left 0.35s cubic-bezier(0.4,0,0.2,1);
}
.contact-row:last-child { border-bottom: 1px solid var(--border); }
.contact-row:hover { padding-left: 1rem; }
.contact-row-label {
  font-size: 0.72rem; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--text3); min-width: 80px; font-weight: 400;
}
.contact-row-val { font-family: var(--font-serif); font-size: 1.15rem; font-weight: 400; flex: 1; }
.contact-row-arrow {
  color: var(--text3); font-size: 1.1rem; position: relative;
  transition: transform 0.35s cubic-bezier(0.4,0,0.2,1), color 0.2s;
}
.contact-row:hover .contact-row-arrow { transform: translate(4px,-4px); color: var(--text); }
.contact-row-arrow .link-preview {
  display: none; position: absolute; bottom: calc(100% + 8px); right: 0;
  background: var(--text); color: var(--bg);
  font-size: 0.72rem; white-space: nowrap; padding: 0.4rem 0.8rem;
  pointer-events: none; z-index: 50;
  font-family: var(--font-sans); letter-spacing: 0;
  box-shadow: 0 4px 16px rgba(0,0,0,0.15);
}
.contact-row:hover .contact-row-arrow .link-preview { display: block; }

/* ── FOOTER ── */
.footer { padding: 2rem 2.5rem; border-top: 1px solid var(--border); background: var(--bg); }
.footer-inner {
  max-width: 1160px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 1rem;
}
.footer-logo { font-family: var(--font-serif); font-size: 1.2rem; font-weight: 400; }
.footer-copy { font-size: 0.8rem; color: var(--text3); }
.footer-links { display: flex; gap: 1.5rem; }
.footer-links a { font-size: 0.78rem; color: var(--text3); letter-spacing: 0.05em; transition: color 0.2s; }
.footer-links a:hover { color: var(--text); }

/* ── REVEAL ── */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ── CERTIFICATES ── */
.certs-section { background: var(--bg2); }
.certs-gallery {
  max-height: 560px;
  overflow-y: auto;
  padding-right: 0.5rem;
  /* custom scrollbar */
  scrollbar-width: thin;
  scrollbar-color: var(--border-strong) transparent;
}
.certs-gallery::-webkit-scrollbar { width: 4px; }
.certs-gallery::-webkit-scrollbar-track { background: transparent; }
.certs-gallery::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 2px; }

.certs-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.2rem;
}
.certs-loading {
  font-size: 0.85rem; color: var(--text3); padding: 2rem 0;
  font-style: italic;
}

/* ── CERT CARD ── */
.cert-card {
  position: relative; overflow: hidden; cursor: pointer;
  border: 1px solid var(--border);
  transition: border-color 0.3s, transform 0.35s cubic-bezier(0.4,0,0.2,1),
              box-shadow 0.35s cubic-bezier(0.4,0,0.2,1);
}
.cert-card:hover {
  border-color: var(--border-strong);
  transform: translateY(-6px) scale(1.012);
  box-shadow: 0 16px 40px rgba(0,0,0,0.12);
}
[data-theme="dark"] .cert-card:hover {
  box-shadow: 0 16px 40px rgba(0,0,0,0.5);
}
.cert-card-img-wrap {
  width: 100%; aspect-ratio: 4/3; overflow: hidden;
  background: var(--surface);
}
.cert-card-img {
  width: 100%; height: 100%; object-fit: cover;
  filter: grayscale(100%) contrast(1.05);
  transition: filter 0.4s ease, transform 0.4s ease;
  display: block;
}
.cert-card:hover .cert-card-img {
  filter: grayscale(0%) contrast(1);
  /* No scale here — scaling inside a clipped container crops the image.
     The card itself lifts via translateY(-6px) scale(1.012) which looks great. */
}
.cert-card-footer {
  padding: 0.75rem 1rem;
  display: flex; align-items: center; justify-content: space-between;
  border-top: 1px solid var(--border);
  background: var(--bg);
}
.cert-card-name {
  font-size: 0.78rem; color: var(--text2); font-weight: 400;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  max-width: calc(100% - 60px);
  letter-spacing: 0.02em;
}
.cert-card-dl {
  font-size: 0.68rem; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--text3); border: 1px solid var(--border);
  padding: 0.2rem 0.55rem; white-space: nowrap;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
  flex-shrink: 0;
}
.cert-card-dl:hover {
  color: var(--bg); background: var(--text); border-color: var(--text);
}

/* ── LIGHTBOX ── */
.cert-lightbox {
  position: fixed; inset: 0; z-index: 2000;
  display: flex; align-items: center; justify-content: center;
  opacity: 0; pointer-events: none;
  transition: opacity 0.3s ease;
}
.cert-lightbox.open { opacity: 1; pointer-events: auto; }
.cert-lightbox-backdrop {
  position: absolute; inset: 0;
  background: rgba(0,0,0,0.82);
  backdrop-filter: blur(8px);
  cursor: pointer;
}
[data-theme="light"] .cert-lightbox-backdrop { background: rgba(0,0,0,0.75); }
.cert-lightbox-inner {
  position: relative; z-index: 1;
  max-width: min(90vw, 860px); width: 100%;
  max-height: 90vh;
  display: flex; flex-direction: column;
  transform: scale(0.92) translateY(16px);
  transition: transform 0.35s cubic-bezier(0.4,0,0.2,1);
}
.cert-lightbox.open .cert-lightbox-inner { transform: scale(1) translateY(0); }
.cert-lightbox-close {
  position: absolute; top: -44px; right: 0;
  background: transparent; border: 1px solid rgba(255,255,255,0.25);
  color: #fff; width: 36px; height: 36px;
  font-size: 0.85rem; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: background 0.2s;
}
.cert-lightbox-close:hover { background: rgba(255,255,255,0.15); }
.cert-lightbox-img {
  width: 100%; max-height: 75vh; object-fit: contain;
  display: block;
  filter: grayscale(0%) contrast(1);
  background: #111;
  opacity: 0;
  transition: opacity 0.4s ease;
}
.cert-lightbox-img.loaded { opacity: 1; }

/* Spinner shown while full-res image is loading */
.cert-lightbox-spinner {
  position: absolute;
  inset: 0;
  display: flex; align-items: center; justify-content: center;
  pointer-events: none;
  background: #111;
  transition: opacity 0.3s ease;
}
.cert-lightbox-spinner.hidden { opacity: 0; }
.cert-lightbox-spinner::after {
  content: '';
  width: 36px; height: 36px;
  border: 2px solid rgba(255,255,255,0.12);
  border-top-color: rgba(255,255,255,0.7);
  border-radius: 50%;
  animation: lb-spin 0.75s linear infinite;
}
@keyframes lb-spin { to { transform: rotate(360deg); } }
.cert-lightbox-footer {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0.9rem 1.2rem;
  background: rgba(10,10,10,0.9);
  border-top: 1px solid rgba(255,255,255,0.1);
}
.cert-lightbox-name {
  font-size: 0.85rem; color: rgba(255,255,255,0.75); font-style: italic;
  font-family: var(--font-serif);
}
.cert-lightbox-dl {
  font-size: 0.72rem; letter-spacing: 0.1em; text-transform: uppercase;
  color: rgba(255,255,255,0.5); border: 1px solid rgba(255,255,255,0.2);
  padding: 0.3rem 0.8rem; white-space: nowrap;
  transition: color 0.2s, border-color 0.2s;
}
.cert-lightbox-dl:hover { color: #fff; border-color: rgba(255,255,255,0.6); }


/* ── RESPONSIVE ── */
@media (max-width: 960px) {
  .hero-content { grid-template-columns: 1fr; gap: 3rem; }
  .hero-right { flex-direction: row; align-items: flex-start; }
  .hero-avatar-frame { width: 200px; height: 240px; }
  .about-grid, .skills-layout { grid-template-columns: 1fr; gap: 2rem; }
  .edu-card { grid-template-columns: 1fr; gap: 1.5rem; }
  .nav-links { display: none; }
  .nav-cta { display: none; }
  .nav-burger { display: flex; }
  .certs-gallery { max-height: 480px; }
}
@media (max-width: 600px) {
  .hero-right { flex-direction: column; align-items: flex-start; }
  .hero-stats-col { flex-direction: row; }
  .project-row { grid-template-columns: 36px 1fr 24px; gap: 1rem; }
  .footer-inner { flex-direction: column; text-align: center; }
  .contact-row-label { min-width: 60px; }
  .certs-grid { grid-template-columns: 1fr; }
  .certs-gallery { max-height: 400px; }
}