/* ============================================================
   style.css — Srihari K G portfolio
   Design tokens → base → components → sections → responsive
   ============================================================ */

/* ---------- 1. Design tokens ---------- */
:root {
  /* type */
  --font-display: 'Sora', system-ui, -apple-system, sans-serif;
  --font-body: 'Inter', system-ui, -apple-system, sans-serif;

  /* fluid type scale */
  --fs-hero: clamp(2.6rem, 8vw, 5.5rem);
  --fs-h2: clamp(1.6rem, 4vw, 2.4rem);
  --fs-lg: clamp(1.05rem, 2vw, 1.25rem);

  /* layout */
  --container: 1100px;
  --radius: 14px;
  --gutter: clamp(1rem, 4vw, 2rem);

  /* motion */
  --ease: cubic-bezier(.22, .61, .36, 1);
  --speed: .45s;
}

/* dark theme (default) */
:root[data-theme='dark'] {
  --bg: #0b0e14;
  --bg-alt: #11141d;
  --surface: #161a26;
  --surface-2: #1d2230;
  --text: #e8ebf2;
  --text-muted: #9aa3b5;
  --accent: #5eead4;          /* teal */
  --accent-2: #818cf8;        /* indigo */
  --accent-contrast: #052e2b; /* text on accent */
  --border: rgba(255, 255, 255, .08);
  --shadow: 0 20px 50px -20px rgba(0, 0, 0, .6);
  --blob-opacity: .35;
}

/* light theme */
:root[data-theme='light'] {
  --bg: #f8f9fc;
  --bg-alt: #eef1f7;
  --surface: #ffffff;
  --surface-2: #f1f3f9;
  --text: #171c28;
  --text-muted: #5a647a;
  --accent: #0d9488;
  --accent-2: #6366f1;
  --accent-contrast: #ffffff;
  --border: rgba(20, 26, 40, .1);
  --shadow: 0 20px 50px -25px rgba(30, 40, 70, .25);
  --blob-opacity: .22;
}

/* ---------- 2. Base / reset ---------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5rem; /* offset for sticky header */
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  transition: background var(--speed), color var(--speed);
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
ul { list-style: none; margin: 0; padding: 0; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: none; }

h1, h2, h3 { font-family: var(--font-display); line-height: 1.15; margin: 0 0 .6em; }

.container { width: min(var(--container), 100% - 2 * var(--gutter)); margin-inline: auto; }
.accent { color: var(--accent); }

/* visible focus for keyboard users */
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }

.skip-link {
  position: absolute; left: -999px; top: 0; z-index: 100;
  background: var(--accent); color: var(--accent-contrast);
  padding: .6rem 1rem; border-radius: 0 0 8px 0; font-weight: 600;
}
.skip-link:focus { left: 0; }

/* ---------- 4. Header / nav ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 80%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: background var(--speed);
}

.nav {
  display: flex; align-items: center; justify-content: space-between;
  padding-block: .9rem;
}

.nav__logo {
  font-family: var(--font-display);
  font-weight: 800; font-size: 1.4rem;
  color: var(--text); letter-spacing: -.02em;
}

.nav__menu { display: flex; align-items: center; gap: 1.8rem; }

.nav__link {
  color: var(--text-muted); font-weight: 500; font-size: .95rem;
  position: relative; padding-block: .3rem;
  transition: color .25s;
}
.nav__link::after {
  content: ''; position: absolute; left: 0; bottom: 0;
  width: 100%; height: 2px; background: var(--accent);
  transform: scaleX(0); transform-origin: right;
  transition: transform .3s var(--ease);
}
.nav__link:hover, .nav__link.is-active { color: var(--text); }
.nav__link:hover::after, .nav__link.is-active::after { transform: scaleX(1); transform-origin: left; }

/* theme toggle */
.theme-toggle {
  display: grid; place-items: center;
  width: 38px; height: 38px;
  border: 1px solid var(--border); border-radius: 50%;
  background: var(--surface); color: var(--text);
  cursor: pointer;
  transition: transform .25s var(--ease), background .25s;
}
.theme-toggle:hover { transform: rotate(20deg) scale(1.08); }
:root[data-theme='dark'] .icon-sun { display: none; }
:root[data-theme='light'] .icon-moon { display: none; }

/* hamburger (mobile) */
.nav__toggle {
  display: none;
  flex-direction: column; gap: 5px;
  background: none; border: 0; cursor: pointer; padding: .5rem;
}
.nav__toggle span {
  width: 24px; height: 2px; background: var(--text);
  transition: transform .3s var(--ease), opacity .3s;
}
.nav__toggle[aria-expanded='true'] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__toggle[aria-expanded='true'] span:nth-child(2) { opacity: 0; }
.nav__toggle[aria-expanded='true'] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- 5. Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: .5rem;
  padding: .8rem 1.6rem;
  font-family: var(--font-display); font-weight: 600; font-size: .95rem;
  border-radius: 999px; border: 1.5px solid transparent;
  cursor: pointer;
  transition: transform .25s var(--ease), box-shadow .25s, background .25s, color .25s;
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }
.btn--sm { padding: .55rem 1.1rem; font-size: .85rem; }

.btn--primary {
  background: var(--accent); color: var(--accent-contrast);
  box-shadow: 0 8px 24px -8px var(--accent);
}
.btn--primary:hover { box-shadow: 0 12px 30px -8px var(--accent); }

.btn--ghost {
  border-color: var(--accent); color: var(--accent); background: transparent;
}
.btn--ghost:hover { background: color-mix(in srgb, var(--accent) 12%, transparent); }

/* ---------- 6. Hero ---------- */
.hero {
  min-height: 100svh;
  display: flex; align-items: center;
  position: relative; overflow: hidden;
}

.hero__bg { position: absolute; inset: 0; z-index: -1; }

/* soft gradient blobs with slow drift */
.blob {
  position: absolute; border-radius: 50%;
  filter: blur(90px); opacity: var(--blob-opacity);
}
.blob--1 {
  width: 520px; height: 520px;
  background: var(--accent);
  top: -10%; right: -8%;
  animation: drift 18s ease-in-out infinite alternate;
}
.blob--2 {
  width: 420px; height: 420px;
  background: var(--accent-2);
  bottom: -12%; left: -6%;
  animation: drift 22s ease-in-out infinite alternate-reverse;
}
@keyframes drift {
  from { transform: translate(0, 0) scale(1); }
  to   { transform: translate(-60px, 50px) scale(1.15); }
}

/* faint grid texture */
.grid-overlay {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, black 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, black 30%, transparent 75%);
}

.hero__inner {
  padding-block: 7rem 4rem;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: clamp(2rem, 5vw, 4rem);
}

/* portrait with gradient ring */
.hero__portrait {
  margin: 0;
  width: clamp(230px, 26vw, 340px);
  aspect-ratio: 1;
  padding: 6px; /* ring thickness */
  border-radius: 50%;
  background: linear-gradient(140deg, var(--accent), var(--accent-2));
  box-shadow: 0 24px 60px -24px color-mix(in srgb, var(--accent) 55%, transparent);
  animation: float 6s ease-in-out infinite alternate;
}
.hero__portrait img {
  width: 100%; height: 100%;
  object-fit: cover;
  border-radius: 50%;
  border: 5px solid var(--bg);
}
@keyframes float {
  from { transform: translateY(-8px); }
  to   { transform: translateY(8px); }
}

.hero__kicker {
  color: var(--accent);
  font-family: var(--font-display); font-weight: 600;
  letter-spacing: .12em; text-transform: uppercase; font-size: .85rem;
  margin: 0 0 .8rem;
}

.hero__title {
  font-size: var(--fs-hero);
  font-weight: 800; letter-spacing: -.03em;
  background: linear-gradient(95deg, var(--text) 30%, var(--accent) 90%);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}

.hero__tagline {
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 3vw, 1.7rem);
  font-weight: 600; color: var(--text-muted);
  min-height: 1.6em; margin: 0 0 1rem;
}
.caret {
  display: inline-block; width: 2px; height: 1.1em;
  background: var(--accent); vertical-align: text-bottom;
  margin-left: 2px;
  animation: blink 1s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.hero__sub { max-width: 56ch; color: var(--text-muted); font-size: var(--fs-lg); }

/* affiliation rows with institute logos */
.hero__affil {
  display: flex; flex-wrap: wrap; gap: 1rem 2.2rem;
  margin-top: 1.4rem;
}
.hero__affil li { display: flex; align-items: center; gap: .75rem; }
.hero__affil img {
  width: 44px; height: auto;
  background: #fff; /* emblems stay legible on dark backgrounds */
  border-radius: 9px; padding: 4px;
}
.hero__affil strong { display: block; font-size: .95rem; }
.hero__affil span { display: block; font-size: .82rem; color: var(--text-muted); }

.hero__cta { display: flex; flex-wrap: wrap; gap: 1rem; margin-top: 2rem; }

.hero__social { display: flex; gap: 1.1rem; margin-top: 2.4rem; }
.hero__social a {
  color: var(--text-muted);
  transition: color .25s, transform .25s var(--ease);
  display: inline-block;
}
.hero__social a:hover { color: var(--accent); transform: translateY(-3px); }

/* scroll hint mouse */
.scroll-hint {
  position: absolute; left: 50%; bottom: 2rem;
  transform: translateX(-50%);
}
.scroll-hint__mouse {
  display: block; width: 24px; height: 38px;
  border: 2px solid var(--text-muted); border-radius: 14px;
  position: relative;
}
.scroll-hint__mouse::after {
  content: ''; position: absolute; left: 50%; top: 7px;
  width: 3px; height: 7px; border-radius: 2px;
  background: var(--accent);
  transform: translateX(-50%);
  animation: scrollwheel 1.6s ease-in-out infinite;
}
@keyframes scrollwheel {
  0% { opacity: 1; transform: translate(-50%, 0); }
  70% { opacity: 0; transform: translate(-50%, 12px); }
  100% { opacity: 0; }
}

/* ---------- 7. Sections (shared) ---------- */
.section { padding-block: clamp(4rem, 9vw, 7rem); }
.section:nth-of-type(even) { background: var(--bg-alt); transition: background var(--speed); }

.section__title {
  font-size: var(--fs-h2); font-weight: 700;
  letter-spacing: -.02em; margin-bottom: 2.5rem;
  display: flex; align-items: baseline; gap: .6rem;
}
.section__num {
  color: var(--accent); font-size: .6em;
  font-weight: 600; font-family: var(--font-display);
}

/* scroll reveal: hidden until .is-visible added by IntersectionObserver */
.reveal {
  opacity: 0; transform: translateY(28px);
  transition: opacity .7s var(--ease), transform .7s var(--ease);
}
.reveal.is-visible { opacity: 1; transform: none; }
/* stagger siblings slightly */
.reveal.is-visible:nth-child(2) { transition-delay: .08s; }
.reveal.is-visible:nth-child(3) { transition-delay: .16s; }
.reveal.is-visible:nth-child(4) { transition-delay: .24s; }

/* ---------- 8. About ---------- */
.about__grid {
  display: grid; gap: 3rem;
  grid-template-columns: 1.2fr .8fr;
  align-items: start;
}
.about__bio p { color: var(--text-muted); margin-top: 0; }
.about__bio strong { color: var(--text); }
.about__bio .btn { margin-top: .8rem; }

.about__skills-title {
  font-size: 1.05rem; color: var(--text);
  margin-bottom: 1.2rem;
}

/* grouped skill lists — understated, professional */
.skill-group { margin-bottom: 1.4rem; }
.skill-group:last-child { margin-bottom: 0; }
.skill-group h4 {
  font-family: var(--font-display); font-size: .78rem; font-weight: 600;
  letter-spacing: .08em; text-transform: uppercase;
  color: var(--text-muted);
  margin: 0 0 .6rem;
}
.skill-tags { display: flex; flex-wrap: wrap; gap: .45rem; }
.skill-tags li {
  font-size: .84rem; font-weight: 500;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border); border-radius: 8px;
  padding: .35rem .75rem;
  transition: border-color .25s;
}
.skill-tags li:hover { border-color: var(--accent); }

/* bio now spans the About section on its own — keep line length readable */
.about__bio { max-width: 760px; }
.about__bio p { font-size: 1.05rem; line-height: 1.75; }

/* ---------- 8a. Recent News ---------- */
.news-list { list-style: none; margin: 0; padding: 0; max-width: 880px; }
.news__item {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 1rem;
  padding: .55rem 0;
  line-height: 1.6;
}
.news__date {
  font-family: var(--font-display); font-weight: 600;
  font-size: .92rem; color: var(--accent);
  white-space: nowrap;
}
.news__text { color: var(--text-muted); }
.news__text strong { color: var(--text); font-weight: 600; }
.news__text a { color: var(--accent); }

@media (max-width: 540px) {
  .news__item { grid-template-columns: 1fr; gap: .15rem; }
}

/* ---------- 8b. Publications ---------- */
.pub-list { display: flex; flex-direction: column; gap: 2.4rem; }

.pub-year {
  font-family: var(--font-display); font-weight: 700;
  font-size: 1.4rem; color: var(--text-muted);
  margin: 0 0 1.4rem;
  padding-bottom: .7rem;
  border-bottom: 1px solid var(--border);
}

.pub {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 1.8rem;
  align-items: start;
  padding-bottom: 2rem;
}
.pub + .pub { border-top: 1px solid var(--border); padding-top: 2rem; }

.pub__thumb {
  display: block; width: 100%; padding: 0;
  border: 1px solid var(--border); border-radius: var(--radius);
  background: #fff; overflow: hidden; cursor: pointer;
  transition: border-color .25s, transform .25s var(--ease), box-shadow .25s;
}
/* squarish rectangle — show the whole teaser (no crop), matted on white */
.pub__thumb img { display: block; width: 100%; height: 175px; object-fit: contain; padding: 12px; box-sizing: border-box; }
.pub__thumb:hover {
  border-color: var(--accent); transform: translateY(-3px);
  box-shadow: 0 18px 40px -22px color-mix(in srgb, var(--accent) 60%, transparent);
}

.pub__body { min-width: 0; }
.pub__title {
  font-family: var(--font-display); font-weight: 700;
  font-size: 1.18rem; line-height: 1.35; color: var(--text);
  margin: 0 0 .6rem;
}
.pub__authors { color: var(--text-muted); margin: 0 0 .5rem; line-height: 1.6; }
.pub__me { color: var(--text); font-weight: 600; text-decoration: underline; text-underline-offset: 3px; }

.pub__venue { margin: 0 0 1rem; }
.pub__badge {
  display: inline-block; font-family: var(--font-display);
  font-size: .85rem; font-weight: 600; letter-spacing: .02em;
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 35%, transparent);
  border-radius: 999px; padding: .3rem .85rem; vertical-align: middle;
}

.pub__links { display: flex; flex-wrap: wrap; gap: .6rem; }
.pub__btn {
  font-family: var(--font-display); font-weight: 600; font-size: .85rem;
  padding: .45rem 1rem; border-radius: 8px;
  border: 1px solid var(--border); background: var(--surface);
  color: var(--text);
  transition: border-color .25s, color .25s, background .25s;
}
a.pub__btn:hover { border-color: var(--accent); color: var(--accent); }
.pub__btn.is-soon { color: var(--text-muted); cursor: not-allowed; opacity: .7; }

@media (max-width: 620px) {
  .pub { grid-template-columns: 1fr; gap: 1.1rem; }
  .pub__thumb { max-width: 360px; }
}

/* ---------- 9. Projects ---------- */
.filters { display: flex; flex-wrap: wrap; gap: .6rem; margin-bottom: 2.2rem; }

.filter-btn {
  padding: .5rem 1.15rem;
  border-radius: 999px; border: 1px solid var(--border);
  background: var(--surface); color: var(--text-muted);
  font-family: var(--font-display); font-weight: 600; font-size: .85rem;
  cursor: pointer;
  transition: background .25s, color .25s, border-color .25s, transform .2s var(--ease);
}
.filter-btn:hover { transform: translateY(-2px); border-color: var(--accent); color: var(--text); }
.filter-btn.is-active {
  background: var(--accent); color: var(--accent-contrast); border-color: var(--accent);
}

.projects-grid {
  display: grid; gap: 1.5rem;
  grid-template-columns: repeat(auto-fill, minmax(310px, 1fr));
}

.project-card {
  background: var(--surface);
  border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden;
  display: flex; flex-direction: column;
  transition: transform .35s var(--ease), box-shadow .35s, opacity .4s var(--ease), scale .4s var(--ease);
  cursor: pointer;
}
.project-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }

/* filtering states */
.project-card.is-hidden { display: none; }
.project-card.is-entering { opacity: 0; scale: .92; }

.project-card__media { position: relative; aspect-ratio: 16 / 10; overflow: hidden; }
.project-card__media img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform .6s var(--ease);
}
.project-card:hover .project-card__media img { transform: scale(1.06); }

/* hover overlay */
.project-card__overlay {
  position: absolute; inset: 0;
  display: grid; place-items: center;
  background: color-mix(in srgb, var(--bg) 55%, transparent);
  backdrop-filter: blur(2px);
  opacity: 0; transition: opacity .35s var(--ease);
}
.project-card:hover .project-card__overlay,
.project-card:focus-visible .project-card__overlay { opacity: 1; }
.project-card__overlay span {
  font-family: var(--font-display); font-weight: 700;
  color: var(--text);
  border: 1.5px solid var(--accent); border-radius: 999px;
  padding: .55rem 1.3rem; font-size: .9rem;
  background: color-mix(in srgb, var(--surface) 70%, transparent);
}

.project-card__body { padding: 1.2rem 1.3rem 1.4rem; display: flex; flex-direction: column; gap: .6rem; flex: 1; }
.project-card__title { font-size: 1.08rem; margin: 0; }
.project-card__desc {
  color: var(--text-muted); font-size: .9rem; margin: 0;
  display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden;
}
.project-card__tags { display: flex; flex-wrap: wrap; gap: .4rem; margin-top: auto; padding-top: .5rem; }
.project-card__tags span {
  font-size: .72rem; font-weight: 600;
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  padding: .25rem .6rem; border-radius: 999px;
}

/* ---------- 10. Timeline ---------- */
.timeline {
  position: relative;
  margin-left: .4rem;
  padding-left: 2rem;
}
.timeline::before {
  content: ''; position: absolute; left: 0; top: 6px; bottom: 6px;
  width: 2px;
  background: linear-gradient(var(--accent), var(--accent-2));
  border-radius: 2px;
}

.timeline__item { position: relative; padding-bottom: 2.6rem; }
.timeline__item:last-child { padding-bottom: 0; }

.timeline__dot {
  position: absolute; left: calc(-2rem - 7px); top: 4px;
  width: 16px; height: 16px; border-radius: 50%;
  background: var(--bg); border: 3px solid var(--accent);
  transition: background .3s, transform .3s var(--ease);
}
.timeline__item:hover .timeline__dot { background: var(--accent); transform: scale(1.2); }
.timeline__item--education .timeline__dot { border-color: var(--accent-2); }
.timeline__item--education:hover .timeline__dot { background: var(--accent-2); }

.timeline__period {
  font-family: var(--font-display); font-size: .8rem; font-weight: 600;
  color: var(--accent); letter-spacing: .06em; text-transform: uppercase;
}
.timeline__item--education .timeline__period { color: var(--accent-2); }

.timeline__title { font-size: 1.15rem; margin: .2rem 0 .1rem; }
.timeline__org { color: var(--text-muted); font-weight: 500; font-size: .95rem; }
.timeline__points { margin-top: .6rem; color: var(--text-muted); font-size: .92rem; }
.timeline__points li {
  position: relative; padding-left: 1.1rem; margin-bottom: .35rem;
}
.timeline__points li::before {
  content: '▹'; position: absolute; left: 0; color: var(--accent);
}

/* ---------- 10b. Gallery ---------- */
.gallery-event { margin-bottom: 3.2rem; }
.gallery-event:last-child { margin-bottom: 0; }

.gallery-event__head {
  display: flex; align-items: baseline; gap: .9rem; flex-wrap: wrap;
}
.gallery-event__head h3 { font-size: 1.15rem; margin: 0; }
.gallery-event__date {
  font-family: var(--font-display); font-size: .8rem; font-weight: 600;
  color: var(--accent); letter-spacing: .05em;
}
.gallery-event__caption {
  color: var(--text-muted); font-size: .92rem;
  margin: .35rem 0 1rem;
}

.gallery-grid {
  display: grid; gap: .7rem;
  grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
}
.gallery-grid button {
  display: block; width: 100%;
  padding: 0; border: 1px solid var(--border); border-radius: 10px;
  overflow: hidden; cursor: pointer; background: var(--surface);
  transition: transform .3s var(--ease), box-shadow .3s, border-color .3s;
}
.gallery-grid button:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
  box-shadow: var(--shadow);
}
/* fixed thumbnail height: portrait/landscape photos all crop to tidy tiles */
.gallery-grid img {
  width: 100%; height: 160px; object-fit: cover;
  transition: transform .5s var(--ease);
}
.gallery-grid button:hover img { transform: scale(1.04); }

.gallery-empty { color: var(--text-muted); }

/* ---------- 11. Contact ---------- */
.contact__text { max-width: 640px; }
.contact__lead { font-size: var(--fs-lg); color: var(--text-muted); margin-top: 0; }
.contact__email {
  font-family: var(--font-display); font-weight: 700;
  font-size: clamp(1.1rem, 2.6vw, 1.45rem);
  display: inline-block; margin-block: .6rem 1.4rem;
  position: relative;
}
.contact__email::after {
  content: ''; position: absolute; left: 0; bottom: -3px;
  width: 100%; height: 2px; background: var(--accent);
  transform: scaleX(0); transform-origin: right;
  transition: transform .3s var(--ease);
}
.contact__email:hover::after { transform: scaleX(1); transform-origin: left; }

.contact__social { display: flex; gap: 1.4rem; }
.contact__social a { color: var(--text-muted); font-weight: 500; transition: color .25s; }
.contact__social a:hover { color: var(--accent); }


/* ---------- 12. Footer ---------- */
.footer { border-top: 1px solid var(--border); padding-block: 1.6rem; }
.footer__inner {
  display: flex; flex-wrap: wrap; gap: 1rem;
  align-items: center; justify-content: space-between;
  color: var(--text-muted); font-size: .88rem;
}
.footer__links { display: flex; gap: 1.4rem; }
.footer__links a { color: var(--text-muted); transition: color .25s; }
.footer__links a:hover { color: var(--accent); }

/* ---------- 13. Lightbox ---------- */
.lightbox { position: fixed; inset: 0; z-index: 90; display: grid; place-items: center; padding: 1rem; }
.lightbox[hidden] { display: none; }

.lightbox__backdrop {
  position: absolute; inset: 0;
  background: rgba(5, 8, 14, .78);
  backdrop-filter: blur(6px);
  animation: fadeIn .3s var(--ease);
}

.lightbox__panel {
  position: relative; z-index: 1;
  width: min(820px, 100%);
  max-height: calc(100svh - 2rem);
  overflow-y: auto;
  background: var(--surface);
  border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow);
  animation: popIn .35s var(--ease);
}
@keyframes fadeIn { from { opacity: 0; } }
@keyframes popIn { from { opacity: 0; transform: translateY(24px) scale(.97); } }

.lightbox__close {
  position: absolute; top: .8rem; right: .8rem; z-index: 2;
  width: 38px; height: 38px; border-radius: 50%;
  background: color-mix(in srgb, var(--bg) 60%, transparent);
  color: var(--text); border: 1px solid var(--border);
  font-size: 1rem; cursor: pointer;
  transition: transform .2s var(--ease), background .2s;
}
.lightbox__close:hover { transform: rotate(90deg); background: var(--surface-2); }

.lightbox__media { position: relative; aspect-ratio: 16 / 9; background: var(--bg-alt); }
.lightbox__img { width: 100%; height: 100%; object-fit: cover; }

.lightbox__nav {
  position: absolute; top: 50%; transform: translateY(-50%);
  width: 42px; height: 42px; border-radius: 50%;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg) 55%, transparent);
  color: var(--text); font-size: 1.5rem; line-height: 1;
  cursor: pointer;
  transition: background .2s, transform .2s var(--ease);
}
.lightbox__nav:hover { background: var(--surface-2); transform: translateY(-50%) scale(1.1); }
.lightbox__nav--prev { left: .8rem; }
.lightbox__nav--next { right: .8rem; }
.lightbox__nav[disabled] { opacity: 0; pointer-events: none; }

.lightbox__dots {
  position: absolute; bottom: .7rem; left: 50%; transform: translateX(-50%);
  display: flex; gap: .4rem;
}
.lightbox__dots i {
  width: 8px; height: 8px; border-radius: 50%;
  background: rgba(255, 255, 255, .45);
  transition: background .2s, transform .2s;
}
.lightbox__dots i.is-active { background: var(--accent); transform: scale(1.25); }

.lightbox__body { padding: 1.5rem 1.7rem 1.8rem; }
.lightbox__body h3 { font-size: 1.3rem; }
.lightbox__body p { color: var(--text-muted); }

.lightbox__stack { display: flex; flex-wrap: wrap; gap: .45rem; margin-block: 1rem; }
.lightbox__stack li {
  font-size: .76rem; font-weight: 600;
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  padding: .3rem .7rem; border-radius: 999px;
}

.lightbox__links { display: flex; gap: .8rem; flex-wrap: wrap; }

/* lock page scroll while lightbox is open */
body.lightbox-open { overflow: hidden; }

/* ---------- 14. Responsive ---------- */
@media (max-width: 720px) {
  .nav__toggle { display: flex; }

  .nav__menu {
    position: fixed; inset: 0 0 0 35%;
    flex-direction: column; justify-content: center;
    background: var(--surface);
    box-shadow: -20px 0 60px rgba(0, 0, 0, .35);
    transform: translateX(110%);
    transition: transform .4s var(--ease);
    z-index: 60;
  }
  .nav__menu.is-open { transform: translateX(0); }
  .nav__link { font-size: 1.1rem; }

  /* hero stacks: portrait above text, centered */
  .hero__inner { padding-top: 6rem; grid-template-columns: 1fr; justify-items: center; text-align: center; gap: 2rem; }
  .hero__portrait { order: -1; width: clamp(170px, 50vw, 230px); }
  .hero__sub { margin-inline: auto; }
  .hero__cta, .hero__social, .hero__affil { justify-content: center; }
  .hero__affil li { text-align: left; }
  .scroll-hint { display: none; }
  .lightbox__body { padding: 1.2rem 1.2rem 1.4rem; }
}

@media (max-width: 380px) {
  .projects-grid { grid-template-columns: 1fr; }
  .btn { padding: .7rem 1.2rem; }
}

/* 4K+ screens: let content breathe a little wider */
@media (min-width: 2200px) {
  :root { --container: 1320px; }
  body { font-size: 1.08rem; }
}

/* ---------- 15. Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
  .reveal { opacity: 1; transform: none; }
}