/* Design tokens */
:root {
  --clr-bg:        #13161e;
  --clr-bg-alt:    #0d0f14;
  --clr-surface:   #1a1e2a;
  --clr-border:    #252a38;
  --clr-accent:    #6c63ff;
  --clr-accent-2:  #a78bfa;
  --clr-text:      #e2e4ed;
  --clr-text-muted:#8b90a7;
  --clr-heading:   #f0f2ff;

  --ff-sans:  'Segoe UI', system-ui, sans-serif;
  --fs-xs:    0.75rem;
  --fs-sm:    0.875rem;
  --fs-base:  1rem;
  --fs-lg:    1.125rem;
  --fs-xl:    1.25rem;
  --fs-2xl:   1.5rem;
  --fs-3xl:   2rem;
  --fs-hero:  clamp(2.5rem, 6vw, 4.5rem);

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;

  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;
  --radius-full: 999rem;

  --shadow-card: 0 0.25rem 1.5rem rgba(0,0,0,0.4);
  --header-h: 4rem;
  --section-pad-y: var(--header-h);
  --section-pad-y-total: calc(var(--header-h) + var(--header-h) + var(--header-h));

  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-slide: cubic-bezier(0.77, 0, 0.175, 1);
  --dur-fast: 150ms;
  --dur-base: 250ms;
  --dur-slow: 400ms;
}

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

html, body {
  height: 100%;
  overflow: hidden;
}
body {
  font-family: var(--ff-sans);
  font-size: var(--fs-base);
  line-height: 1.7;
  color: var(--clr-text);
  background-color: var(--clr-bg-alt);
}

* {
  scrollbar-width: thin;
  scrollbar-color: rgba(108, 99, 255, 0.65) rgba(19, 22, 30, 0.35);
}
*::-webkit-scrollbar { width: 0.625rem; height: 0.625rem; }
*::-webkit-scrollbar-track { background: rgba(19, 22, 30, 0.35); }
*::-webkit-scrollbar-thumb {
  background: linear-gradient(to bottom, var(--clr-accent), var(--clr-accent-2));
  border: 2px solid rgba(19, 22, 30, 0.9);
  border-radius: var(--radius-full);
}
*::-webkit-scrollbar-thumb:hover {
  background: var(--clr-accent-2);
}

img, svg { display: block; max-width: 100%; }

a {
  color: var(--clr-accent);
  text-decoration: none;
  transition: color var(--dur-fast) var(--ease);
}
a:hover { color: var(--clr-accent-2); }
a:focus-visible {
  outline: 2px solid var(--clr-accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

ul, ol { list-style: none; }

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

/* Layout */
.container, .header-inner, .footer-inner {
  width: 100%;
  max-width: 69rem;
  margin-inline: auto;
  padding-inline: var(--space-6);
}
.header-inner, .cert-card, .contact-link, .footer-inner, .proj-slide-meta {
  display: flex;
  align-items: center;
}

/* Header */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(13, 15, 20, 0.85);
  backdrop-filter: blur(0.75rem);
  -webkit-backdrop-filter: blur(0.75rem);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur-base) var(--ease), box-shadow var(--dur-base) var(--ease);
}
.site-header.scrolled {
  border-color: var(--clr-border);
  box-shadow: 0 2px 24px rgba(0,0,0,0.5);
}

.header-inner {
  justify-content: space-between;
  height: 100%;
}

.logo {
  font-size: var(--fs-xl);
  font-weight: 700;
  color: var(--clr-heading);
  letter-spacing: 0.05em;
  transition: color var(--dur-fast) var(--ease);
}
.logo:hover { color: var(--clr-accent); }

.nav-list { display: flex; gap: var(--space-8); }

.nav-link {
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--clr-text-muted);
  letter-spacing: 0.03em;
  text-transform: uppercase;
  position: relative;
  padding-bottom: var(--space-1);
  transition: color var(--dur-fast) var(--ease);
}
.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0;
  width: 0; height: 2px;
  background: var(--clr-accent);
  border-radius: var(--radius-full);
  transition: width var(--dur-base) var(--ease);
}
.nav-link:hover, .nav-link.active { color: var(--clr-heading); }
.nav-link:hover::after, .nav-link.active::after { width: 100%; }

.hamburger {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 1.75rem; height: 1.25rem;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}
.hamburger-bar {
  display: block;
  width: 100%; height: 2px;
  background: var(--clr-text);
  border-radius: var(--radius-full);
  transition: transform var(--dur-base) var(--ease), opacity var(--dur-base) var(--ease);
}
.hamburger[aria-expanded="true"] .hamburger-bar:nth-child(1) { transform: translateY(0.56rem) rotate(45deg); }
.hamburger[aria-expanded="true"] .hamburger-bar:nth-child(2) { opacity: 0; }
.hamburger[aria-expanded="true"] .hamburger-bar:nth-child(3) { transform: translateY(-0.56rem) rotate(-45deg); }

.nav-mobile {
  display: none;
  background: var(--clr-surface);
  border-top: 1px solid var(--clr-border);
  overflow: hidden;
  max-height: 0;
  transition: max-height var(--dur-slow) var(--ease);
}
.nav-mobile[hidden] { display: none; }
.nav-mobile.open { max-height: 25rem; }
.hero-content,
.nav-mobile-list,
.facts-list,
.skill-bars,
.lang-list,
.contact-links,
.contact-form,
.form-group {
  display: flex;
  flex-direction: column;
}
.nav-mobile-list {
  padding: var(--space-4) var(--space-6);
  gap: var(--space-4);
}
.nav-mobile-link {
  display: block;
  font-size: var(--fs-lg);
  color: var(--clr-text);
  padding-block: var(--space-2);
}
.nav-mobile-link:hover { color: var(--clr-accent); }

/* Sections */
.section--alt { background-color: var(--clr-bg-alt); }

.section-header { text-align: center; margin-bottom: var(--space-10); }
.section-tag, .hero-eyebrow, .proj-cat {
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--clr-accent);
}
.section-tag { display: inline-block; }
.section-title {
  font-size: var(--fs-3xl);
  font-weight: 700;
  color: var(--clr-heading);
  position: relative;
}
.section-title::after {
  content: '';
  display: block;
  width: 3rem; height: 0.2rem;
  background: var(--clr-accent);
  border-radius: var(--radius-full);
  margin: var(--space-2) auto 0;
}

/* Intro section */
.accent { color: var(--clr-accent); }

.hero-container {
  display: flex;
  align-items: center;
  gap: var(--space-16);
  width: 100%;
}
.hero-content {
  flex: 1;
  gap: var(--space-4);
}
.hero-visual { position: relative; flex-shrink: 0; }
.hero-avatar {
  width: 18rem; height: 18rem;
  padding: 0.25rem;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--clr-accent), var(--clr-accent-2));
  overflow: hidden;
  box-shadow: 0 0 40px rgba(108, 99, 255, 0.3);
}
.hero-photo {
  width: 100%;
  height: 100%;
  display: block;
  border-radius: inherit;
  object-fit: cover;
  object-position: center 78%;
}
.hero-orbit {
  position: absolute;
  top: 50%; left: 50%;
  width: 0; height: 0;
  pointer-events: none;
  animation: spinSlow var(--dur) linear var(--delay) infinite var(--dir, normal);
}
.hero-orbit::after {
  content: '';
  position: absolute;
  width: var(--size);
  height: var(--size);
  top: calc(-1 * var(--r) - var(--size) / 2);
  left: calc(-1 * var(--size) / 2);
  border-radius: 50%;
  background: var(--clr, var(--clr-accent));
  box-shadow: 0 0 0 var(--glow, 0.2rem) rgba(108, 99, 255, 0.25);
}
.orbit-1 { --r:7rem; --dur:14s; --delay:0s;    --size:0.875rem; --glow:0.25rem; }
.orbit-2 { --r:9.5rem;  --dur:21s; --delay:-4s;   --size:0.625rem; --dir:reverse; --clr:var(--clr-accent-2); }
.orbit-3 { --r:5.75rem;  --dur:11s; --delay:-3s;   --size:0.5rem;   --dir:reverse; }
.orbit-4 { --r:11.5rem;  --dur:28s; --delay:-9s;   --size:0.75rem;  --glow:0.25rem; }
.orbit-5 { --r:8.25rem;      --dur:17s; --delay:-6s;   --size:0.56rem;--dir:reverse; --clr:var(--clr-accent-2); }
.orbit-6 { --r:12.5rem; --dur:34s; --delay:-16s;  --size:0.44rem; }
.hero-title { font-size: var(--fs-hero); font-weight: 800; line-height: 1.1; color: var(--clr-heading); }
.hero-subtitle { font-size: var(--fs-xl); color: var(--clr-text-muted); }
.hero-desc { color: var(--clr-text-muted); max-width: 34rem; }
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-top: var(--space-2);
}

@keyframes spinSlow { to { transform: rotate(360deg); } }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  font-size: var(--fs-sm);
  font-weight: 600;
  cursor: pointer;
  border: 2px solid transparent;
  transition:
    background-color var(--dur-fast) var(--ease),
    color var(--dur-fast) var(--ease),
    border-color var(--dur-fast) var(--ease),
    transform var(--dur-fast) var(--ease),
    box-shadow var(--dur-fast) var(--ease);
}
.btn:hover { transform: translateY(-0.125rem); }
.btn:active { transform: translateY(0); }
.btn-primary { background: var(--clr-accent); color: #fff; }
.btn-primary:hover { background: var(--clr-accent-2); color: #fff; box-shadow: 0 4px 20px rgba(108,99,255,0.4); }
.btn-outline { border-color: var(--clr-border); color: var(--clr-text); }
.btn-outline:hover { border-color: var(--clr-accent); color: var(--clr-accent); }
.btn--full { width: 100%; justify-content: center; }

/* About */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 21rem;
  gap: var(--space-16);
  align-items: start;
}
.about-text p + p { margin-top: var(--space-4); }
.about-text .github-activity { margin-top: var(--space-6); }
.about-facts {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
}
.facts-list { gap: var(--space-4); }
.fact-item, .lang-item {
  display: flex;
  justify-content: space-between;
  gap: var(--space-4);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--clr-border);
}
.fact-item:last-child, .lang-item:last-child { border-bottom: none; padding-bottom: 0; }
.fact-item { align-items: baseline; }
.fact-label {
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--clr-text-muted);
  white-space: nowrap;
}
.fact-value { color: var(--clr-heading); text-align: right; word-break: break-word; }

/* Education timeline */
.timeline {
  position: relative;
  padding-left: var(--space-8);
  margin-bottom: var(--space-12);
}
.timeline::before {
  content: '';
  position: absolute;
  left: 0.44rem; top: 0.5rem; bottom: 0.5rem;
  width: 0.125rem;
  background: linear-gradient(to bottom, var(--clr-accent), transparent);
}
.timeline-item { position: relative; padding-bottom: var(--space-12); }
.timeline-item:last-child { padding-bottom: 0; }
.timeline-marker {
  position: absolute;
  left: calc(-1 * var(--space-8) + 0.1rem);
  top: 0.5rem;
  width: 0.875rem; height: 0.875rem;
  border-radius: 50%;
  background: var(--clr-accent);
  box-shadow: 0 0 0 4px rgba(108, 99, 255, 0.25);
}
.timeline-date {
  display: block;
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--clr-accent);
  margin-bottom: var(--space-2);
}
.timeline-title, .certs-title { font-size: var(--fs-xl); color: var(--clr-heading); }
.timeline-title { margin-bottom: var(--space-1); }
.timeline-org { font-size: var(--fs-sm); color: var(--clr-text-muted); margin-bottom: var(--space-3); }

.certs-title { margin-bottom: var(--space-6); }
.certs-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
}
.cert-card {
  gap: var(--space-3);
  height: 100%;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  color: var(--clr-text);
  transition: border-color var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease);
}
.cert-card:hover { border-color: var(--clr-accent); color: var(--clr-text); transform: translateY(-0.125rem); }
.cert-card strong { color: var(--clr-heading); }
.cert-badge {
  width: 4rem;
  height: 4rem;
  object-fit: contain;
  flex-shrink: 0;
  border-radius: var(--radius-sm);
}
.cert-year {
  display: block;
  font-size: var(--fs-xs);
  color: var(--clr-text-muted);
  margin-bottom: var(--space-1);
}

/* Project technology tags */
.project-tech { display: flex; flex-wrap: wrap; gap: var(--space-2); }
.project-tech li {
  padding: var(--space-1) var(--space-3);
  background: rgba(108, 99, 255, 0.12);
  border-radius: var(--radius-full);
  font-size: var(--fs-xs);
  color: var(--clr-accent-2);
}

/* Skills */
.skills-layout {
  display: grid;
  grid-template-columns: minmax(18rem, 0.35fr) 1fr 1fr;
  gap: var(--space-8);
  align-items: start;
}
.skill-group--primary { grid-column: 1; grid-row: 1 / span 2; --step-idx: 1; }
.skills-layout .skill-group:nth-child(2) { grid-column: 2; grid-row: 2; --step-idx: 4; }
.skills-layout .skill-group:nth-child(3) { grid-column: 3; grid-row: 2; --step-idx: 5; }
.skills-layout .skill-group:nth-child(4) { grid-column: 2; grid-row: 1; --step-idx: 2; }
.skills-layout .skill-group:nth-child(5) { grid-column: 3; grid-row: 1; --step-idx: 3; }
.skill-group-title {
  font-size: var(--fs-lg);
  color: var(--clr-heading);
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--clr-border);
}
.skill-bars { gap: var(--space-3); }
.skill-bar-item {
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-rows: auto auto;
  column-gap: var(--space-3);
  align-items: center;
}
.skill-name { font-size: var(--fs-sm); color: var(--clr-text); }
.skill-level {
  font-size: var(--fs-xs);
  color: var(--clr-text-muted);
  font-weight: 600;
}
.skill-bar {
  grid-column: 1 / -1;
  height: 0.375rem;
  background: var(--clr-border);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-top: var(--space-2);
}
.skill-fill {
  height: 100%;
  width: var(--level-width, 0%);
  background: linear-gradient(to right, var(--clr-accent), var(--clr-accent-2));
  border-radius: var(--radius-full);
  transform-origin: left;
  transform: scaleX(0);
  transition: transform 0.8s var(--ease);
}
.skill-fill--basics { --level-width: 20%; }
.skill-fill--familiar { --level-width: 40%; }
.skill-fill--working { --level-width: 60%; }
.skill-fill--advanced { --level-width: 80%; }
.skill-fill--expert { --level-width: 100%; }
.skill-fill.animate { transform: scaleX(1); }

.skill-tags { display: flex; flex-wrap: wrap; gap: var(--space-2); }
.skill-tags li {
  padding: var(--space-2) var(--space-3);
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-full);
  font-size: var(--fs-xs);
  color: var(--clr-text-muted);
  transition: background-color var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease);
}
.skill-tags li:hover { background: rgba(108,99,255,0.1); border-color: var(--clr-accent); color: var(--clr-accent); }

.lang-list { gap: var(--space-4); }
.lang-list--compact {
  gap: var(--space-3);
  margin-top: var(--space-6);
}
.lang-item { align-items: center; }
.lang-name { font-weight: 500; }
.lang-level { font-size: var(--fs-xs); font-weight: 600; padding: var(--space-1) var(--space-3); border-radius: var(--radius-full); }
.lang-level--native { background: rgba(108,99,255,0.2);  color: var(--clr-accent-2); }
.lang-level--neutral { background: rgba(139,144,167,0.18); color: var(--clr-text-muted); }
.lang-level--fluent  { background: rgba(52,211,153,0.15); color: #34d399; }

/* Contact */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-16); align-items: start; }
.contact-intro {
  color: var(--clr-text-muted);
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-6);
  border-bottom: 1px solid var(--clr-border);
  font-size: var(--fs-lg);
  line-height: 1.6;
}
.contact-links { gap: var(--space-4); }
.contact-link {
  gap: var(--space-3);
  color: var(--clr-text);
  font-size: var(--fs-sm);
  transition: color var(--dur-fast) var(--ease);
}
.contact-link:hover { color: var(--clr-accent); }
.contact-icon { width: 1.25rem; height: 1.25rem; fill: currentColor; flex-shrink: 0; }
.github-activity {
  margin-top: var(--space-8);
  padding-top: var(--space-6);
  border-top: 1px solid var(--clr-border);
}
.github-activity-title {
  font-size: var(--fs-lg);
  color: var(--clr-heading);
  margin-bottom: var(--space-4);
}
.github-activity a {
  display: block;
  transition: opacity var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease);
}
.github-activity a:hover {
  opacity: 0.85;
  transform: translateY(-0.125rem);
}
.github-activity-chart {
  width: 100%;
  min-height: 8rem;
  object-fit: contain;
}

.contact-form { gap: var(--space-6); }
.form-group { gap: var(--space-2); }
.form-label { font-size: var(--fs-sm); font-weight: 600; color: var(--clr-text-muted); }
.form-input {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  color: var(--clr-text);
  font-size: var(--fs-base);
  font-family: inherit;
  transition: border-color var(--dur-fast) var(--ease);
}
.form-input::placeholder { color: var(--clr-text-muted); opacity: 0.6; }
.form-input:focus { outline: none; border-color: var(--clr-accent); box-shadow: 0 0 0 3px rgba(108,99,255,0.15); }
.form-textarea { resize: vertical; min-height: 7.5rem; }

/* Footer */
.site-footer { border-top: 1px solid var(--clr-border); padding-block: var(--space-4); margin-top: var(--space-8); }
.footer-inner {
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
}
.footer-copy { font-size: var(--fs-sm); color: var(--clr-text-muted); }

/* Fullscreen scroll controller */
main {
  position: fixed;
  inset: 0;
  overflow: hidden;
  z-index: 0;
}
main > section {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: safe center;
  padding-block: var(--section-pad-y);
  overflow-x: hidden;
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-gutter: stable;
  background-color: var(--clr-bg);
  transform: translateY(100%);
  pointer-events: none;
  transition: transform 0.85s var(--ease-slide);
  will-change: transform;
}
main > section.sec-above  { transform: translateY(-100%); pointer-events: none; }
main > section.sec-active { transform: translateY(0);     pointer-events: auto; }
main > section.sec-below  { transform: translateY(100%);  pointer-events: none; }

/* Scroll steps */
.scroll-step {
  opacity: 0;
  transform: translateY(1.75rem);
  pointer-events: none;
  transition: opacity 0.45s var(--ease), transform 0.45s var(--ease);
}
.scroll-step.step-visible { opacity: 1; transform: translateY(0); pointer-events: auto; }

/* Progress dots */
.progress-nav {
  position: fixed;
  right: 1.5rem;
  top: 50%;
  transform: translateY(-50%);
  z-index: 200;
}
.progress-dots { display: flex; flex-direction: column; gap: 0.625rem; }
.dot {
  display: block;
  width: 0.5rem; height: 0.5rem;
  border-radius: 50%;
  background: var(--clr-border);
  border: none;
  cursor: pointer;
  padding: 0;
  transition: background-color var(--dur-base) var(--ease), transform var(--dur-base) var(--ease);
}
.dot:hover { background: var(--clr-text-muted); }
.dot--active { background: var(--clr-accent); transform: scale(1.625); }

/* 1080 – large tablet */
@media (max-width: 1080px) {
  .hero-container { flex-direction: column-reverse; text-align: center; }
  .hero-actions { justify-content: center; }
  .hero-avatar  { width: 13.5rem; height: 13.5rem; }
  .orbit-1 { --r:5.5rem;    --size:0.75rem;   }
  .orbit-2 { --r:7.25rem;  --size:0.5rem;    }
  .orbit-3 { --r:4.25rem;  --size:0.44rem; }
  .orbit-4 { --r:8.75rem;  --size:0.625rem;  }
  .orbit-5 { --r:6.25rem;   --size:0.5rem;    }
  .orbit-6 { --r:9.5rem;  --size:0.375rem;  }
  .about-grid { grid-template-columns: 1fr; gap: var(--space-12); }
  .skills-layout { grid-template-columns: 1fr 1fr; }
  .skills-layout .skill-group--primary { grid-column: 1; grid-row: 1 / span 2; }
  .skills-layout .skill-group:nth-child(2) { grid-column: 2; grid-row: 1; }
  .skills-layout .skill-group:nth-child(3) { grid-column: 2; grid-row: 2; }
  .skills-layout .skill-group:nth-child(4) { grid-column: 1; grid-row: 3; }
  .skills-layout .skill-group:nth-child(5) { grid-column: 2; grid-row: 3; }
  .skills-layout .skill-group:nth-child(2) { --step-idx: 2; }
  .skills-layout .skill-group:nth-child(3) { --step-idx: 3; }
  .skills-layout .skill-group:nth-child(4) { --step-idx: 4; }
  .skills-layout .skill-group:nth-child(5) { --step-idx: 5; }
}

/* 768 – hamburger + layout, JS scroll still active */
@media (max-width: 768px) {
  .certs-list    { grid-template-columns: 1fr; }
  .contact-grid  { grid-template-columns: 1fr; }
  .skills-layout { grid-template-columns: 1fr; }
  :root { --header-h: 3.5rem; }

  .nav-main     { display: none; }
  .hamburger    { display: flex; }
  .nav-mobile   { display: block; }
  .progress-nav { display: none; }

  .skills-layout .skill-group--primary,
  .skills-layout .skill-group:nth-child(2),
  .skills-layout .skill-group:nth-child(3),
  .skills-layout .skill-group:nth-child(4),
  .skills-layout .skill-group:nth-child(5) { grid-column: auto; grid-row: auto; }
  .section-title { font-size: var(--fs-2xl); }
}

/* 480 – small mobile: compact visual scale, fullscreen scroll stays active */
@media (max-width: 480px) {
  .hero-avatar { width: 8.5rem; height: 8.5rem; }
  .orbit-1 { --r:3.5rem; --size:0.625rem;  }
  .orbit-2 { --r:4.75rem;  --size:0.44rem; }
  .orbit-3 { --r:2.875rem;   --size:0.375rem;  }
  .orbit-4 { display: none; }
  .orbit-5 { --r:4rem; --size:0.44rem; }
  .orbit-6 { display: none; }
  .section-header { margin-bottom: var(--space-10); }
  .hero-content   { gap: var(--space-3); }
  .about-facts    { padding: var(--space-6); }
  .contact-grid   { gap: var(--space-8); }
}

/* 320 – minimum support */
@media (max-width: 320px) {
  :root { --header-h: 3rem; }
  .container { padding-inline: var(--space-4); }
  .section-title { font-size: var(--fs-xl); }
  .hero-avatar { width: 6.75rem; height: 6.75rem; }
  .orbit-1 { --r:2.75rem; --size:0.5rem;    }
  .orbit-2 { --r:3.5rem;  --size:0.375rem;  }
  .orbit-3 { display: none; }
  .orbit-5 { --r:3rem; --size:0.375rem; }
}

.proj-container {
  display: flex;
  gap: var(--space-12);
  height: calc(100vh - var(--section-pad-y-total));
  padding-block: var(--space-8);
  align-items: stretch;
  overflow: hidden;
}

/* Left timeline nav */
.proj-nav {
  width: 10rem;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  justify-content: center;
}

/* Track area */
.proj-track-area {
  display: flex;
  flex-direction: row;
  gap: var(--space-4);
  align-items: stretch;
  height: calc((100vh - var(--header-h)) * 2 / 3);
}

.proj-track {
  width: 0.125rem;
  flex-shrink: 0;
  background: linear-gradient(to bottom, var(--clr-accent), var(--clr-accent-2));
  border-radius: 0.1rem;
}
.proj-nav-toggle { display: none; }

/* Timeline labels */
.proj-nav-list {
  flex: 1;
  position: relative;
  overflow: visible;
}

.proj-nav-btn {
  position: absolute;
  left: 0; right: 0;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  text-align: left;
  font-size: var(--fs-xs);
  font-family: inherit;
  color: var(--clr-text-muted);
  line-height: 1.2;
  text-decoration: none;
  transition: top       0.45s var(--ease),
              transform 0.45s var(--ease),
              font-size var(--dur-base) var(--ease),
              color     var(--dur-fast) var(--ease);
}

/* Timeline dots */
.proj-nav-btn::before {
  content: '';
  position: absolute;
  left: -1.4rem;
  top: 50%;
  transform: translateY(-50%);
  width: 0.625rem; height: 0.625rem;
  border-radius: 50%;
  border: 2px solid var(--clr-border);
  background: var(--clr-bg);
  z-index: 1;
  transition: all var(--dur-base) var(--ease);
}

.proj-nav-btn:hover { color: var(--clr-text); }
.proj-nav-btn:hover::before { border-color: var(--clr-text-muted); }

.proj-nav-btn.active {
  font-size: var(--fs-sm);
  color: var(--clr-heading);
  font-weight: 700;
}
.proj-nav-btn.active::before {
  width: 0.75rem; height: 0.75rem;
  left: -1.4rem;
  border-color: var(--clr-accent);
  background: var(--clr-accent);
  box-shadow: 0 0 0 3px rgba(108,99,255,0.25);
}

/* Right slides area */
.proj-slides {
  flex: 1;
  position: relative;
  overflow: hidden;
}

.proj-slide {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: var(--space-4);
  overflow-y: auto;
  pointer-events: none;
  padding-right: var(--space-2);
}

.proj-slide.step-visible { pointer-events: auto; }

.proj-slide-meta {
  gap: var(--space-4);
  flex-wrap: wrap;
}

.proj-date {
  font-size: var(--fs-xs);
  color: var(--clr-text-muted);
}

.proj-title {
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 800;
  color: var(--clr-heading);
  line-height: 1.1;
}
.proj-title-note {
  display: inline-block;
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--clr-text-muted);
}

.proj-desc {
  color: var(--clr-text-muted);
  line-height: 1.7;
  max-width: 40rem;
}

/* Mobile: stack timeline above slides */
@media (max-width: 768px) {
  .proj-container {
    flex-direction: column;
    gap: 0;
    height: auto;
    min-height: 0;
    overflow: visible;
  }
  .proj-nav {
    position: relative;
    width: 100%;
    gap: var(--space-2);
    align-self: unset;
    margin-bottom: var(--space-4);
  }
  .proj-track-area { display: block; height: auto; width: 100%; }
  .proj-track { display: none; }
  .proj-nav::before { content: 'Projekty'; font-size: var(--fs-xs); font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: var(--clr-accent); width: 100%; }
  .proj-nav > .section-tag { display: none; }
  .proj-nav-toggle {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    padding: var(--space-2) var(--space-4);
    border: 1px solid var(--clr-accent);
    border-radius: var(--radius-full);
    background: rgba(108,99,255,0.14);
    color: var(--clr-heading);
    font: inherit;
    font-size: var(--fs-sm);
    font-weight: 700;
    cursor: pointer;
  }
  .proj-nav-toggle::after {
    content: '';
    width: 0.5rem;
    height: 0.5rem;
    border-right: 2px solid currentColor;
    border-bottom: 2px solid currentColor;
    transform: translateY(-0.15rem) rotate(45deg);
    transition: transform var(--dur-fast) var(--ease);
  }
  .proj-nav.open .proj-nav-toggle::after { transform: translateY(0.1rem) rotate(225deg); }
  .proj-nav-list {
    display: none;
    position: absolute;
    z-index: 20;
    top: calc(100% + var(--space-2));
    left: 0;
    right: 0;
    max-height: 45vh;
    overflow-y: auto;
    padding: var(--space-2);
    border: 1px solid var(--clr-border);
    border-radius: var(--radius-md);
    background: rgba(26,30,42,0.98);
    box-shadow: var(--shadow-card);
  }
  .proj-nav.open .proj-nav-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
  }
  .proj-nav-btn::before { display: none; }
  .proj-nav-btn {
    position: static;
    left: auto;
    right: auto;
    top: auto !important;
    transform: none !important;
    display: block;
    padding: var(--space-2) var(--space-3);
    border: 1px solid var(--clr-border);
    border-radius: var(--radius-md);
    font-size: var(--fs-xs);
  }
  .proj-nav-btn.active {
    background: var(--clr-accent);
    border-color: var(--clr-accent);
    color: #fff;
  }
  .proj-slides { position: static; min-height: 0; overflow: visible; }
  .proj-slide {
    display: none;
    position: static;
    padding-right: 0;
    padding-bottom: var(--space-4);
    overflow: visible;
  }
  .proj-slide.step-visible {
    display: flex;
    animation: projectMobileIn 0.28s var(--ease);
  }
}

@keyframes projectMobileIn {
  from { opacity: 0; transform: translateY(0.75rem); }
  to { opacity: 1; transform: translateY(0); }
}

/* Honeypot — hidden anti-spam field (kept out of inline styles for a strict CSP) */
.hp-field { position: absolute; left: -9999px; }