/* ==========================================================================
   Utshab Kumar Ghosh — portfolio stylesheet
   --------------------------------------------------------------------------
   HOW TO EDIT
   - All colors, fonts and spacing live in the :root blocks below ("tokens").
     Change a token once and the whole site updates.
   - Section-specific styles are grouped under banner comments in page order.
   ========================================================================== */

/* ====================== 1. DESIGN TOKENS ====================== */

:root {
  /* type */
  --font-sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --fs-xs: 0.8125rem;
  --fs-sm: 0.9rem;
  --fs-base: 1rem;
  --fs-md: clamp(1.05rem, 0.95rem + 0.4vw, 1.2rem);
  --fs-lg: clamp(1.3rem, 1.1rem + 0.8vw, 1.7rem);
  --fs-xl: clamp(1.7rem, 1.3rem + 1.6vw, 2.4rem);
  --fs-hero: clamp(2.3rem, 1.6rem + 3.2vw, 3.8rem);

  /* layout */
  --container: 1080px;
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.75rem;
  --space-4: 3rem;
  --space-section: clamp(4rem, 3rem + 4vw, 6.5rem);
  --radius: 12px;
  --radius-sm: 8px;

  /* motion */
  --ease: cubic-bezier(0.2, 0.6, 0.2, 1);
}

/* dark (default) */
:root,
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0f1115;
  --bg-soft: #151921;
  --surface: #1a1f29;
  --border: #2a3140;
  --text: #dce2ea;
  --text-muted: #9aa5b4;
  --heading: #f4f6f9;
  --accent: #bdd266;
  --accent-strong: #d3e487;
  --accent-contrast: #1d2308;  /* text on accent buttons */
  --accent-soft: rgba(189, 210, 102, 0.12);
  /* secondary category colors (web = teal, other = orange) */
  --teal: #5fd4c4;
  --teal-soft: rgba(95, 212, 196, 0.12);
  --orange: #f5a268;
  --orange-soft: rgba(245, 162, 104, 0.12);
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}

/* light */
:root[data-theme="light"] {
  color-scheme: light;
  --bg: #fafaf7;
  --bg-soft: #f1f2ec;
  --surface: #ffffff;
  --border: #dee1d6;
  --text: #2a2f38;
  --text-muted: #5b636f;
  --heading: #171b22;
  --accent: #5d6e1e;
  --accent-strong: #4c5a16;
  --accent-contrast: #ffffff;
  --accent-soft: rgba(93, 110, 30, 0.1);
  --teal: #0e7569;
  --teal-soft: rgba(14, 117, 105, 0.1);
  --orange: #a44e0e;
  --orange-soft: rgba(164, 78, 14, 0.1);
  --shadow: 0 10px 30px rgba(23, 27, 34, 0.08);
}

/* ====================== 2. BASE ====================== */

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

html {
  scroll-behavior: smooth;
  /* keep section headings clear of the sticky header on anchor jumps */
  scroll-padding-top: 5rem;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  color: var(--heading);
  line-height: 1.2;
  margin: 0 0 var(--space-2);
  font-weight: 700;
  letter-spacing: -0.01em;
}

p {
  margin: 0 0 var(--space-2);
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  color: var(--accent-strong);
  text-decoration: underline;
  text-underline-offset: 3px;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

.container {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: clamp(1rem, 4vw, 2rem);
}

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

.section-alt {
  background: var(--bg-soft);
}

.section-title {
  font-size: var(--fs-xl);
  text-align: center;
  margin-bottom: 0.4rem;
}

.section-subtitle {
  text-align: center;
  color: var(--text-muted);
  max-width: 46rem;
  margin: 0 auto var(--space-4);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -3rem;
  z-index: 100;
  padding: 0.6rem 1rem;
  border-radius: var(--radius-sm);
  background: var(--accent);
  color: var(--accent-contrast);
  font-weight: 600;
  transition: top 0.15s var(--ease);
}

.skip-link:focus {
  top: 1rem;
}

/* ====================== 3. BUTTONS, CHIPS, CARDS ====================== */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 1.25rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--heading);
  font-weight: 600;
  font-size: var(--fs-sm);
  cursor: pointer;
  transition: transform 0.15s var(--ease), background 0.15s var(--ease), border-color 0.15s var(--ease);
}

.btn:hover {
  text-decoration: none;
  transform: translateY(-2px);
  border-color: var(--accent);
  color: var(--heading);
}

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-contrast);
}

.btn-primary:hover {
  background: var(--accent-strong);
  border-color: var(--accent-strong);
  color: var(--accent-contrast);
}

.btn svg {
  width: 1em;
  height: 1em;
  flex: none;
}

.chip {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font-size: var(--fs-xs);
  font-weight: 500;
  line-height: 1.5;
}

.chip-accent {
  background: var(--accent-soft);
  border-color: transparent;
  color: var(--accent);
  font-weight: 600;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-3);
}

/* ====================== 4. HEADER / NAV ====================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--bg); /* fallback for browsers without color-mix() */
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  min-height: 4rem;
}

.brand {
  font-weight: 800;
  font-size: 1.05rem;
  color: var(--heading);
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.brand:hover {
  text-decoration: none;
  color: var(--accent);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  display: block;
  padding: 0.45rem 0.7rem;
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: var(--fs-sm);
  font-weight: 500;
}

.nav-links a:hover {
  color: var(--heading);
  background: var(--accent-soft);
  text-decoration: none;
}

.nav-links a.active {
  color: var(--accent);
  font-weight: 600;
}

.nav-cta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-cta .btn {
  padding: 0.45rem 1rem;
}

.theme-toggle,
.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem; /* ≥44px touch target */
  height: 2.75rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--heading);
  cursor: pointer;
  padding: 0;
}

.theme-toggle:hover,
.nav-toggle:hover {
  border-color: var(--accent);
}

.theme-toggle svg,
.nav-toggle svg {
  width: 1.1rem;
  height: 1.1rem;
}

/* show one icon per theme */
.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }
:root[data-theme="light"] .theme-toggle .icon-sun { display: block; }
:root[data-theme="light"] .theme-toggle .icon-moon { display: none; }

.nav-toggle {
  display: none;
}

@media (max-width: 860px) {
  .nav-toggle {
    display: inline-flex;
  }

  .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0.5rem clamp(1rem, 4vw, 2rem) 1rem;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    display: none;
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    padding: 0.75rem 0.5rem;
    font-size: var(--fs-base);
  }

  .nav-cta .btn span {
    display: none; /* icon-only CV button on small screens */
  }
}

/* thin reading-progress bar under the header */
.scroll-progress {
  position: absolute;
  bottom: -1px;
  left: 0;
  height: 2px;
  width: 0;
  background: var(--accent);
}

/* ====================== 5. HERO ====================== */

.hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(4rem, 3rem + 6vw, 8rem);
}

/* soft color glow behind the hero */
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(580px 320px at 78% 18%, var(--accent-soft), transparent 70%),
    radial-gradient(460px 280px at 12% 85%, var(--teal-soft), transparent 70%);
}

.hero .container {
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  gap: var(--space-4);
  align-items: center;
}

.hero-eyebrow {
  color: var(--accent);
  font-weight: 600;
  font-size: var(--fs-sm);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: var(--space-1);
}

.hero h1 {
  font-size: var(--fs-hero);
  font-weight: 800;
  letter-spacing: -0.025em;
  margin-bottom: 0.5rem;
}

@supports (background-clip: text) or (-webkit-background-clip: text) {
  .hero h1 {
    background: linear-gradient(100deg, var(--heading) 35%, var(--accent) 90%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
  }
}

.hero-role {
  font-size: var(--fs-lg);
  font-weight: 600;
  color: var(--text);
  margin-bottom: var(--space-2);
}

.hero-blurb {
  color: var(--text-muted);
  font-size: var(--fs-md);
  max-width: 36rem;
  margin-bottom: var(--space-3);
}

.hero-blurb strong {
  color: var(--text);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: var(--space-3);
}

.social-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.social-row li {
  display: contents; /* the <a> tiles are the flex items */
}

.social-row a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem; /* ≥44px touch target */
  height: 2.75rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  transition: transform 0.15s var(--ease), color 0.15s var(--ease), border-color 0.15s var(--ease);
}

.social-row a:hover {
  color: var(--accent);
  border-color: var(--accent);
  transform: translateY(-2px);
}

.social-row svg {
  width: 1.15rem;
  height: 1.15rem;
  fill: currentColor;
}

.hero-photo {
  justify-self: center;
}

.hero-photo img {
  width: min(320px, 70vw);
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: 24px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.hero-highlights {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: var(--space-4);
}

@media (max-width: 820px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }

  .hero-photo {
    order: -1;
  }

  .hero-photo img {
    width: min(220px, 60vw);
  }
}

/* ====================== 6. RESEARCH / PUBLICATIONS ====================== */

.pub-list {
  display: grid;
  gap: var(--space-2);
  max-width: 56rem;
  margin-inline: auto;
}

.pub-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-3);
}

.pub-year {
  font-weight: 700;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
  padding-top: 0.15rem;
  min-width: 3.2rem;
}

.pub-item h3 {
  font-size: var(--fs-md);
  margin-bottom: 0.35rem;
}

.pub-meta {
  color: var(--text-muted);
  font-size: var(--fs-sm);
  margin-bottom: 0.35rem;
}

.pub-meta b {
  color: var(--text);
  font-weight: 600;
}

.pub-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  align-items: center;
}

@media (max-width: 600px) {
  .pub-item {
    grid-template-columns: 1fr;
    gap: 0.35rem;
  }
}

/* ====================== 7. PROJECTS ====================== */

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: var(--space-3);
}

.filter-btn {
  padding: 0.4rem 1rem;
  min-height: 2.75rem; /* ≥44px touch target */
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font-size: var(--fs-sm);
  font-weight: 500;
  cursor: pointer;
}

.filter-btn:hover {
  border-color: var(--accent);
}

.filter-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-contrast);
  font-weight: 600;
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-2);
}

.project-card {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  padding: var(--space-2) var(--space-2) var(--space-2);
  transition: transform 0.15s var(--ease), border-color 0.15s var(--ease);
}

.project-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
}

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

/* category-colored chips: lime for ML (default), teal for web, orange for other */
.project-card[data-tags~="web"] .chip-accent {
  color: var(--teal);
  background: var(--teal-soft);
}

.project-card[data-tags~="other"] .chip-accent {
  color: var(--orange);
  background: var(--orange-soft);
}

.project-card[data-tags~="web"]:hover {
  border-color: var(--teal);
}

.project-card[data-tags~="other"]:hover {
  border-color: var(--orange);
}

.project-card h3 {
  font-size: 1.05rem;
  margin: 0;
}

.project-card h3 a {
  color: var(--heading);
}

.project-card h3 a:hover {
  color: var(--accent);
}

.project-card p {
  color: var(--text-muted);
  font-size: var(--fs-sm);
  margin: 0;
  flex-grow: 1;
}

.project-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.project-foot a {
  font-size: var(--fs-sm);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.project-foot svg {
  width: 0.95rem;
  height: 0.95rem;
}

/* ====================== 8. COMPETITIONS ====================== */

.comp-list {
  display: grid;
  gap: var(--space-2);
  max-width: 56rem;
  margin-inline: auto;
}

.comp-item {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.5rem var(--space-3);
  align-items: center;
}

.comp-item h3 {
  font-size: var(--fs-md);
  margin-bottom: 0.25rem;
}

.comp-meta {
  color: var(--text-muted);
  font-size: var(--fs-sm);
  margin: 0;
}

.comp-result {
  text-align: right;
}

.comp-rank {
  display: block;
  font-weight: 700;
  color: var(--accent);
  white-space: nowrap;
}

.comp-result a,
.comp-result span.comp-note {
  font-size: var(--fs-xs);
  color: var(--text-muted);
}

@media (max-width: 600px) {
  .comp-item {
    grid-template-columns: 1fr;
  }

  .comp-result {
    text-align: left;
  }
}

/* ====================== 9. EXPERIENCE & EDUCATION ====================== */

.background-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}

.background-grid h3 {
  font-size: var(--fs-lg);
  margin-bottom: var(--space-3);
}

.timeline {
  display: grid;
  gap: var(--space-3);
  border-left: 2px solid var(--border);
  padding-left: var(--space-3);
}

.timeline-item {
  position: relative;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: calc(-1 * var(--space-3) - 6px);
  top: 0.4rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
}

.timeline-date {
  font-size: var(--fs-xs);
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.timeline-item h4 {
  font-size: var(--fs-md);
  margin: 0.2rem 0;
}

.timeline-item p {
  color: var(--text-muted);
  font-size: var(--fs-sm);
  margin-bottom: 0.25rem;
}

.timeline-org {
  font-weight: 600;
  font-size: var(--fs-sm);
}

@media (max-width: 820px) {
  .background-grid {
    grid-template-columns: 1fr;
  }
}

/* ====================== 10. SKILLS ====================== */

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-2);
  max-width: 56rem;
  margin-inline: auto;
}

.skill-group h3 {
  font-size: var(--fs-sm);
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* colored dot before each skill group, cycling through the palette */
.skill-group h3::before {
  content: "";
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  background: var(--accent);
  flex: none;
}

.skill-group:nth-of-type(3n + 2) h3::before {
  background: var(--teal);
}

.skill-group:nth-of-type(3n) h3::before {
  background: var(--orange);
}

.skill-group ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

/* ====================== 11. GITHUB ACTIVITY ====================== */

.gh-card {
  max-width: 56rem;
  margin-inline: auto;
  margin-top: var(--space-4);
  overflow: hidden;
}

.gh-head {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: var(--space-2);
}

.gh-head svg {
  width: 1.3rem;
  height: 1.3rem;
  color: var(--accent);
  flex: none;
}

.gh-head h3 {
  margin: 0;
  font-size: var(--fs-md);
}

.gh-calendar {
  font-size: var(--fs-xs);
  color: var(--text);
  overflow-x: auto;
}

.gh-calendar .contrib-footer {
  font-size: var(--fs-xs);
}

.gh-fallback {
  color: var(--text-muted);
  font-size: var(--fs-sm);
  margin: 0;
}

/* ====================== 12. ACCOMPLISHMENTS ====================== */

.achievement-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.achievement-card {
  border-top: 3px solid var(--accent);
}

/* give each achievement its own color, like the old site */
.achievement-card:nth-of-type(2) {
  border-top-color: var(--teal);
}

.achievement-card:nth-of-type(2) h3 {
  color: var(--teal);
}

.achievement-card:nth-of-type(3) {
  border-top-color: var(--orange);
}

.achievement-card:nth-of-type(3) h3 {
  color: var(--orange);
}

.achievement-card:nth-of-type(1) h3 {
  color: var(--accent);
}

.achievement-card h3 {
  font-size: var(--fs-md);
  margin-bottom: 0.3rem;
}

.achievement-card .when {
  display: block;
  font-size: var(--fs-xs);
  color: var(--text-muted);
  margin-bottom: 0.6rem;
}

.achievement-card p {
  color: var(--text-muted);
  font-size: var(--fs-sm);
  margin: 0;
}

.subsection-title {
  font-size: var(--fs-lg);
}

.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-2);
  margin-top: var(--space-3);
}

.cert-card {
  padding: var(--space-2);
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.cert-card img {
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  object-position: top;
}

.cert-card h3 {
  font-size: var(--fs-sm);
  margin: 0;
}

.center-cta {
  text-align: center;
  margin-top: var(--space-3);
}

/* ====================== 13. TESTIMONIALS ====================== */

.testimonial-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 380px), 1fr));
  gap: var(--space-2);
}

.testimonial-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin: 0; /* it's a <figure> */
}

.testimonial-card blockquote {
  margin: 0;
  color: var(--text-muted);
  font-size: var(--fs-sm);
  flex-grow: 1;
}

.testimonial-card blockquote::before {
  content: "\201C";
  display: block;
  font-size: 2.5rem;
  line-height: 1;
  color: var(--accent);
  font-family: Georgia, serif;
  margin-bottom: 0.25rem;
}

.testimonial-who {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.testimonial-who img {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--border);
}

.testimonial-who .name {
  font-weight: 600;
  color: var(--heading);
  font-size: var(--fs-sm);
}

.testimonial-who .role {
  color: var(--text-muted);
  font-size: var(--fs-xs);
}

/* ====================== 14. CONTACT ====================== */

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-2);
  max-width: 56rem;
  margin-inline: auto;
}

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

.contact-card svg {
  width: 1.6rem;
  height: 1.6rem;
  color: var(--accent);
  margin-inline: auto;
  margin-bottom: 0.6rem;
}

.contact-card h3 {
  font-size: var(--fs-sm);
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.contact-card p {
  margin: 0;
  font-size: var(--fs-sm);
}

.contact-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
  margin-top: var(--space-4);
}

/* ====================== 15. FOOTER ====================== */

.site-footer {
  border-top: 1px solid var(--border);
  padding-block: var(--space-4);
  text-align: center;
}

.site-footer .social-row {
  justify-content: center;
  margin-bottom: var(--space-3);
}

.footer-note {
  color: var(--text-muted);
  font-size: var(--fs-sm);
  margin: 0;
}

/* ====================== 16. GALLERY PAGE ====================== */

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: var(--space-2);
}

.gallery-item {
  margin: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform 0.15s var(--ease), border-color 0.15s var(--ease);
}

.gallery-item:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
}

.gallery-item[hidden] {
  display: none;
}

.gallery-item button {
  display: block;
  width: 100%;
  padding: 0;
  border: 0;
  background: none;
  cursor: zoom-in;
}

.gallery-item img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  object-position: top;
}

.gallery-item figcaption {
  padding: 0.75rem var(--space-2) var(--space-2);
  font-size: var(--fs-sm);
}

.gallery-item figcaption a {
  font-weight: 600;
}

.lightbox {
  border: 0;
  border-radius: var(--radius);
  padding: 0;
  background: var(--surface);
  max-width: min(92vw, 980px);
  box-shadow: var(--shadow);
}

.lightbox::backdrop {
  background: rgba(8, 10, 14, 0.8);
  backdrop-filter: blur(4px);
}

.lightbox img {
  width: 100%;
  max-height: 78vh;
  object-fit: contain;
  background: var(--bg);
}

.lightbox-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  padding: 0.75rem var(--space-2);
}

.lightbox-bar p {
  margin: 0;
  font-size: var(--fs-sm);
  color: var(--heading);
  font-weight: 600;
}

/* ====================== 17. UTILITIES & MOTION ====================== */

.back-to-top {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  z-index: 40;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--heading);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s var(--ease);
  box-shadow: var(--shadow);
}

.back-to-top.show {
  opacity: 1;
  pointer-events: auto;
}

.back-to-top svg {
  width: 1.1rem;
  height: 1.1rem;
}

.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
}

.reveal.visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}