/* ==========================================================================
   Design tokens
   ========================================================================== */
:root {
  --color-text: #1d1d1f;
  --color-text-secondary: #55555a;
  --color-bg: #f5f5f7;
  --color-surface: #ffffff;
  --color-border: #d2d2d7;
  --color-accent: #0071e3;
  --color-accent-dark: #0057ab;
  --color-purple: #8b5cf6;
  --color-coral: #ff6961;
  --color-teal: #12b8a6;
  --color-amber: #f5a623;
  --gradient-primary: linear-gradient(135deg, var(--color-accent), var(--color-purple));

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --fs-base: 1.0625rem;
  --fs-sm: 0.9rem;
  --fs-lg: clamp(1.25rem, 1.2vw + 1rem, 1.5rem);
  --fs-xl: clamp(1.75rem, 2vw + 1.2rem, 2.5rem);
  --fs-hero: clamp(2.75rem, 5vw + 1rem, 4.75rem);

  --space-1: 4px;  --space-2: 8px;  --space-3: 16px;
  --space-4: 24px; --space-5: 32px; --space-6: 48px;
  --space-7: 64px; --space-8: 96px; --space-9: 128px;
  --section-py: clamp(64px, 10vw, 140px);

  --max-width: 1120px;
  --radius-card: 18px;
  --radius-sm: 10px;
  --shadow-card: 0 2px 24px rgba(0,0,0,.07);
  --transition-base: 200ms ease;
  --transition-slow: 900ms cubic-bezier(.22,1,.36,1);
  --header-h: 64px;
}

/* ==========================================================================
   Reset / base
   ========================================================================== */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: var(--header-h); }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
h1, h2, h3, h4 { line-height: 1.15; margin: 0 0 var(--space-3); font-weight: 600; letter-spacing: -0.02em; }
h2 { font-size: var(--fs-xl); }
h3 { font-size: var(--fs-lg); }
p { margin: 0 0 var(--space-3); color: var(--color-text-secondary); }
ul, ol { margin: 0; padding: 0; list-style: none; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }

.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;
}

.skip-link {
  position: absolute; top: -100%; left: var(--space-3);
  background: var(--color-accent); color: #fff;
  padding: var(--space-2) var(--space-4); border-radius: var(--radius-sm);
  z-index: 1000; transition: top var(--transition-base);
}
.skip-link:focus { top: var(--space-3); }

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

/* ==========================================================================
   Layout primitives
   ========================================================================== */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 var(--space-4); }
.section { padding: var(--section-py) 0; }
.section--tint { background: var(--color-surface); }
.section__lead { max-width: 640px; font-size: var(--fs-lg); margin-bottom: var(--space-6); }

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 13px 26px; border-radius: 999px; font-weight: 500;
  font-size: 0.98rem; transition: transform var(--transition-base), background var(--transition-base), color var(--transition-base);
  white-space: nowrap;
}
.btn--primary { background: var(--gradient-primary); color: #fff; }
.btn--primary:hover { filter: brightness(1.08); }
.btn--ghost { background: transparent; color: var(--color-accent); border: 1px solid var(--color-border); }
.btn--ghost:hover { border-color: var(--color-accent); }
.btn:active { transform: scale(0.97); }

/* ==========================================================================
   Reveal on scroll
   ========================================================================== */
@media (prefers-reduced-motion: no-preference) {
  [data-reveal] {
    opacity: 0; transform: translateY(24px);
    transition: opacity 700ms ease, transform 700ms ease;
  }
  [data-reveal].is-visible { opacity: 1; transform: none; }
}

/* ==========================================================================
   Header / Nav
   ========================================================================== */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 500;
  height: var(--header-h);
  background: rgba(245,245,247,0.8);
  backdrop-filter: saturate(180%) blur(16px);
  -webkit-backdrop-filter: saturate(180%) blur(16px);
  border-bottom: 1px solid rgba(0,0,0,0.06);
}
.site-header__inner {
  height: 100%; display: flex; align-items: center; justify-content: space-between; gap: var(--space-4);
}

.brand { display: block; }
.brand__mark { height: 26px; width: auto; }

.nav { flex: 1; display: flex; justify-content: center; }
.nav__list { display: flex; gap: var(--space-5); }
.nav__list a { font-size: 0.92rem; color: var(--color-text-secondary); transition: color var(--transition-base); }
.nav__list a:hover, .nav__list a.is-active { color: var(--color-text); }

.nav__toggle {
  display: none; flex-direction: column; justify-content: center; gap: 5px;
  width: 34px; height: 34px;
}
.nav__toggle span { display: block; width: 100%; height: 2px; background: var(--color-text); border-radius: 2px; transition: transform var(--transition-base), opacity var(--transition-base); }
.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); }

.lang-switch {
  display: flex; align-items: center; gap: 4px;
  font-size: 0.85rem; font-weight: 600; color: var(--color-text-secondary);
  padding: 6px 10px; border-radius: 999px; border: 1px solid var(--color-border);
}
.lang-switch__opt { padding: 2px 4px; border-radius: 6px; transition: color var(--transition-base), background var(--transition-base); }
.lang-switch__sep { opacity: 0.4; }
html[data-lang="cs"] .lang-switch__opt[data-lang-opt="cs"],
html[data-lang="en"] .lang-switch__opt[data-lang-opt="en"] {
  color: var(--color-text); background: var(--color-bg);
}

@media (max-width: 800px) {
  .nav__toggle { display: flex; }
  .nav__list {
    position: fixed; top: var(--header-h); left: 0; right: 0;
    flex-direction: column; align-items: center; gap: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    max-height: 0; overflow: hidden;
    transition: max-height var(--transition-base);
  }
  .nav__list.is-open { max-height: 400px; }
  .nav__list li { width: 100%; text-align: center; }
  .nav__list a { display: block; padding: var(--space-3); }
}

/* ==========================================================================
   Hero
   ========================================================================== */
.hero { padding: calc(var(--header-h) + var(--space-8)) 0 var(--space-8); position: relative; }
.hero__inner {
  display: grid; grid-template-columns: 1.1fr 0.9fr; gap: var(--space-7);
  align-items: center;
}
.eyebrow {
  text-transform: uppercase; letter-spacing: 0.1em; font-size: 0.8rem;
  font-weight: 600; background: var(--gradient-primary); -webkit-background-clip: text;
  background-clip: text; color: transparent; margin-bottom: var(--space-3);
}
.hero h1 { font-size: var(--fs-hero); margin-bottom: var(--space-3); }
.hero__lead { font-size: var(--fs-lg); max-width: 46ch; }
.hero__actions { display: flex; gap: var(--space-3); margin-top: var(--space-5); flex-wrap: wrap; }
.hero__media img {
  width: 100%; height: auto;
  border-radius: var(--radius-card); box-shadow: var(--shadow-card);
}

.scroll-cue {
  position: absolute; left: 50%; bottom: -56px; transform: translateX(-50%);
  width: 28px; height: 44px; border: 2px solid var(--color-bg); border-radius: 20px;
  z-index: 5;
}
.scroll-cue__dot {
  position: absolute; top: 8px; left: 50%; width: 4px; height: 8px;
  background: var(--color-bg); border-radius: 2px; transform: translateX(-50%);
}
@media (prefers-reduced-motion: no-preference) {
  .scroll-cue__dot { animation: scroll-cue-bounce 1.6s ease infinite; }
}
@keyframes scroll-cue-bounce {
  0% { opacity: 1; transform: translate(-50%, 0); }
  70% { opacity: 0; transform: translate(-50%, 14px); }
  100% { opacity: 0; transform: translate(-50%, 14px); }
}

@media (max-width: 900px) {
  .hero__inner { grid-template-columns: 1fr; }
  .hero__media { order: -1; max-width: 320px; margin: 0 auto; }
}

/* ==========================================================================
   About
   ========================================================================== */
.about__grid { display: grid; grid-template-columns: 1.3fr 1fr; gap: var(--space-7); align-items: start; }
.about__text p { font-size: 1.02rem; }
.about__media { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-3); }
.about__media img { border-radius: var(--radius-card); object-fit: cover; width: 100%; height: 100%; }
.about__media img:first-child { grid-column: 1 / -1; aspect-ratio: 4 / 3; object-position: center 30%; }
.about__media img:nth-child(2) { aspect-ratio: 1 / 1; }
.about__media img:nth-child(3) { aspect-ratio: 1 / 1; }

@media (max-width: 900px) {
  .about__grid { grid-template-columns: 1fr; }
}

/* ==========================================================================
   Timeline (Experience)
   ========================================================================== */
.timeline { position: relative; max-width: 760px; margin: 0 auto; padding-left: var(--space-6); }
.timeline::before {
  content: ""; position: absolute; left: 6px; top: 6px; bottom: 6px; width: 1px;
  background: var(--color-border);
}
.timeline__item { position: relative; padding-bottom: var(--space-6); }
.timeline__item:last-child { padding-bottom: 0; }
.timeline__item::before {
  content: ""; position: absolute; left: calc(-1 * var(--space-6) + 1px); top: 6px;
  width: 11px; height: 11px; border-radius: 50%;
  background: var(--color-surface); border: 2px solid var(--dot-color, var(--color-accent));
}
.timeline__item:nth-child(1) { --dot-color: var(--color-accent); }
.timeline__item:nth-child(2) { --dot-color: var(--color-teal); }
.timeline__item:nth-child(3) { --dot-color: var(--color-coral); }
.timeline__item:nth-child(4) { --dot-color: var(--color-amber); }
.timeline__item:nth-child(5) { --dot-color: var(--color-purple); }
.timeline__date { font-size: var(--fs-sm); color: var(--dot-color, var(--color-accent)); font-weight: 600; margin-bottom: var(--space-1); }
.timeline__org { font-size: 0.95rem; margin: 0; }
.timeline__content h3 { margin-bottom: 2px; }

/* ==========================================================================
   Cards grid (Education)
   ========================================================================== */
.cards-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-4); }
.card {
  background: var(--color-surface); border-radius: var(--radius-card);
  padding: var(--space-5); box-shadow: var(--shadow-card);
}
.card__org { font-size: 0.95rem; margin-bottom: var(--space-1); }
.card__note { font-size: var(--fs-sm); margin: 0; }

@media (max-width: 700px) {
  .cards-grid { grid-template-columns: 1fr; }
}

/* ==========================================================================
   Skills
   ========================================================================== */
.skills-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-6); }
.skills-group h3 { display: flex; align-items: center; gap: var(--space-2); }
.skills-group h3::before {
  content: ""; width: 9px; height: 9px; border-radius: 50%; background: var(--group-color, var(--color-accent));
  flex: none;
}
.skills-group:nth-child(1) { --group-color: var(--color-accent); }
.skills-group:nth-child(2) { --group-color: var(--color-teal); }
.skills-group:nth-child(3) { --group-color: var(--color-purple); }
.tag-list { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-top: var(--space-3); }
.tag-list li {
  background: color-mix(in srgb, var(--group-color, var(--color-accent)) 10%, var(--color-bg));
  border: 1px solid color-mix(in srgb, var(--group-color, var(--color-accent)) 30%, var(--color-border));
  color: var(--color-text);
  padding: 7px 14px; border-radius: 999px; font-size: 0.9rem;
}
.section--tint .tag-list li { background: color-mix(in srgb, var(--group-color, var(--color-accent)) 12%, var(--color-surface)); }

@media (max-width: 800px) {
  .skills-grid { grid-template-columns: 1fr; gap: var(--space-5); }
}

/* ==========================================================================
   Personality traits
   ========================================================================== */
.traits { display: flex; flex-direction: column; gap: var(--space-5); max-width: 760px; }
.trait__label { display: flex; justify-content: space-between; margin-bottom: var(--space-2); font-size: 0.95rem; }
.trait__value { color: var(--color-text-secondary); font-variant-numeric: tabular-nums; }
.trait__track { height: 10px; border-radius: 999px; background: var(--color-border); overflow: hidden; }
.trait__fill { width: 0; height: 100%; border-radius: 999px; background: var(--trait-color, var(--color-accent)); }
.trait:nth-child(1) { --trait-color: var(--color-accent); }
.trait:nth-child(2) { --trait-color: var(--color-coral); }
.trait:nth-child(3) { --trait-color: var(--color-teal); }
.trait:nth-child(4) { --trait-color: var(--color-amber); }
.trait:nth-child(5) { --trait-color: var(--color-purple); }
.trait:nth-child(6) { --trait-color: #ec4899; }
.trait:nth-child(7) { --trait-color: #22c55e; }
.trait:nth-child(8) { --trait-color: #f43f5e; }
@media (prefers-reduced-motion: no-preference) {
  .trait__fill { transition: width var(--transition-slow); }
}
.trait.is-visible .trait__fill { width: var(--value); }
@media (prefers-reduced-motion: reduce) {
  .trait__fill { width: var(--value); }
}

/* ==========================================================================
   Portfolio
   ========================================================================== */
.projects-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-5); }
.project-card {
  background: var(--color-surface); border-radius: var(--radius-card);
  overflow: hidden; box-shadow: var(--shadow-card);
  display: flex; flex-direction: column;
}
.project-card__media {
  display: block; aspect-ratio: 16 / 9; position: relative;
}
.project-card__media img {
  width: 100%; height: 100%; object-fit: cover; display: block;
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.7);
  transition: transform 400ms ease;
}
.project-card:hover .project-card__media img { transform: scale(1.04); }
.project-card__body { padding: var(--space-4) var(--space-5) var(--space-5); flex: 1; display: flex; flex-direction: column; }
.project-card__body h3 { margin-bottom: var(--space-2); }
.project-card__body h3 a:hover { color: var(--color-accent); }
.project-card__body p { flex: 1; font-size: 0.95rem; }
.project-card__link { font-size: 0.9rem; font-weight: 500; color: var(--color-accent); }

@media (max-width: 800px) {
  .projects-grid { grid-template-columns: 1fr; }
}

/* ==========================================================================
   Services
   ========================================================================== */
.services-split { display: grid; grid-template-columns: 0.8fr 1.2fr; gap: var(--space-7); align-items: start; }
.services-block--recruiter {
  background: var(--color-surface); border-radius: var(--radius-card);
  padding: var(--space-6); box-shadow: var(--shadow-card); position: sticky; top: calc(var(--header-h) + var(--space-4));
}
.services-block__actions { display: flex; flex-direction: column; gap: var(--space-3); margin-top: var(--space-5); align-items: flex-start; }
.service-cards { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-3); }
.service-card {
  background: var(--color-surface); border-radius: var(--radius-sm);
  padding: var(--space-4); border: 1px solid var(--color-border);
  border-top: 3px solid var(--card-color, var(--color-accent));
}
.service-card:nth-child(1) { --card-color: var(--color-accent); }
.service-card:nth-child(2) { --card-color: var(--color-coral); }
.service-card:nth-child(3) { --card-color: var(--color-amber); }
.service-card:nth-child(4) { --card-color: var(--color-teal); }
.service-card:nth-child(5) { --card-color: var(--color-purple); }
.service-card:nth-child(6) { --card-color: #ec4899; }
.service-card h4 { font-size: 1rem; margin-bottom: var(--space-1); }
.service-card p { font-size: 0.9rem; margin: 0; }
.services-block--client .services-block__actions { margin-top: var(--space-5); }

@media (max-width: 900px) {
  .services-split { grid-template-columns: 1fr; }
  .services-block--recruiter { position: static; }
  .service-cards { grid-template-columns: 1fr; }
}

/* ==========================================================================
   Gallery + Lightbox
   ========================================================================== */
.gallery-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-3); }
.gallery-item {
  border-radius: var(--radius-sm); overflow: hidden; aspect-ratio: 4 / 3; padding: 0;
  position: relative;
}
.gallery-item img { width: 100%; height: 100%; object-fit: cover; transition: transform 400ms ease; }
.gallery-item:hover img { transform: scale(1.06); }

@media (max-width: 900px) {
  .gallery-grid { grid-template-columns: repeat(2, 1fr); }
}

.lightbox {
  border: none; border-radius: var(--radius-card); padding: 0;
  max-width: min(90vw, 900px); max-height: 90vh; background: var(--color-surface);
}
.lightbox::backdrop { background: rgba(0,0,0,0.75); }
.lightbox__img { width: 100%; max-height: 75vh; object-fit: contain; background: #000; }
.lightbox__caption { padding: var(--space-3) var(--space-4); margin: 0; font-size: 0.9rem; }
.lightbox__close {
  position: absolute; top: var(--space-2); right: var(--space-2); z-index: 2;
  width: 36px; height: 36px; border-radius: 50%; background: rgba(0,0,0,0.6); color: #fff;
  font-size: 1.4rem; line-height: 1; display: flex; align-items: center; justify-content: center;
}
.lightbox__nav {
  position: absolute; top: 50%; transform: translateY(-50%); z-index: 2;
  width: 40px; height: 40px; border-radius: 50%; background: rgba(0,0,0,0.5); color: #fff;
  display: flex; align-items: center; justify-content: center;
  transition: background var(--transition-base);
}
.lightbox__nav:hover { background: rgba(0,0,0,0.75); }
.lightbox__nav svg { width: 20px; height: 20px; }
.lightbox__nav--prev { left: var(--space-2); }
.lightbox__nav--next { right: var(--space-2); }

/* ==========================================================================
   Testimonials
   ========================================================================== */
.testimonials-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-4); }
.testimonial-card {
  background: var(--color-surface); border-radius: var(--radius-card);
  padding: var(--space-5); box-shadow: var(--shadow-card);
  border-top: 3px solid var(--tcard-color, var(--color-accent));
  display: flex; flex-direction: column; margin: 0;
}
.testimonial-card:nth-child(1) { --tcard-color: var(--color-accent); }
.testimonial-card:nth-child(2) { --tcard-color: var(--color-coral); }
.testimonial-card:nth-child(3) { --tcard-color: var(--color-amber); }
.testimonial-card:nth-child(4) { --tcard-color: var(--color-teal); }
.testimonial-card:nth-child(5) { --tcard-color: var(--color-purple); }
.testimonial-card blockquote { margin: 0 0 var(--space-4); flex: 1; }
.testimonial-card blockquote p { color: var(--color-text); font-size: 0.96rem; margin: 0; }
.testimonial-card figcaption { display: flex; flex-direction: column; font-size: 0.85rem; }
.testimonial-card__name { font-weight: 600; color: var(--color-text); }
.testimonial-card__context { color: var(--color-text-secondary); }

@media (max-width: 900px) {
  .testimonials-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
  .testimonials-grid { grid-template-columns: 1fr; }
}

/* ==========================================================================
   Contact
   ========================================================================== */
.section--contact { text-align: center; }
.section--contact .section__lead { margin-left: auto; margin-right: auto; }
.contact-links { display: flex; flex-wrap: wrap; justify-content: center; gap: var(--space-4); }
.contact-link {
  font-size: 1.05rem; font-weight: 500; padding: 14px 28px;
  border: 1px solid var(--color-border); border-radius: 999px;
  transition: border-color var(--transition-base), color var(--transition-base);
}
.contact-link:hover { border-color: var(--color-accent); color: var(--color-accent); }

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer { padding: var(--space-5) 0; border-top: 1px solid var(--color-border); }
.site-footer__inner {
  display: grid; grid-template-columns: 1fr auto 1fr; align-items: center;
  gap: var(--space-4); font-size: 0.85rem; color: var(--color-text-secondary);
}
.site-footer p { margin: 0; }
.site-footer__copy { justify-self: start; }
.site-footer__logo { justify-self: center; height: 26px; width: auto; opacity: 0.8; }
.site-footer__social { justify-self: end; display: flex; align-items: center; gap: var(--space-3); }
.site-footer__social a { color: var(--color-text-secondary); transition: color var(--transition-base); }
.site-footer__social a:hover { color: var(--color-accent); }
.site-footer__social svg { width: 18px; height: 18px; display: block; }

@media (max-width: 600px) {
  .site-footer__inner { grid-template-columns: 1fr; justify-items: center; text-align: center; gap: var(--space-3); }
  .site-footer__copy, .site-footer__logo, .site-footer__social { justify-self: center; }
}

/* ==========================================================================
   i18n — dual language spans
   ========================================================================== */
html[data-lang="cs"] [data-en] { display: none; }
html[data-lang="en"] [data-cz] { display: none; }

/* ==========================================================================
   Print
   ========================================================================== */
@media print {
  .site-header, .nav__toggle, .lang-switch, .hero__actions, .gallery-grid,
  .services-block__actions, .site-footer, .lightbox { display: none !important; }
  body { background: #fff; color: #000; }
  .section { padding: var(--space-4) 0; }
}

/* Practical experience and skills */
.hero__availability { margin-top: var(--space-4); max-width: 48ch; font-size: var(--fs-sm); }
.experience-list { list-style: disc; padding-left: 1.2rem; margin-top: var(--space-3); color: var(--color-text-secondary); }
.experience-list li + li { margin-top: var(--space-2); }
.experience-list strong { font-weight: 600; color: var(--color-text); }
.skills-group__note { font-size: 0.95rem; margin-top: var(--space-3); margin-bottom: 0; }
.approach-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--space-4); }
.approach-grid .card h3 { font-size: 1.25rem; }
.approach-grid .card p { margin-bottom: 0; font-size: 0.98rem; }
@media (max-width: 900px) {
  .approach-grid { grid-template-columns: 1fr; }
}