/* ============================================================
   ARTRONWEB.cz — style.css
   ============================================================ */

:root {
  --bg: #0a0b0f;
  --bg-alt: #0e1016;
  --card: #13151d;
  --line: rgba(255, 255, 255, 0.08);
  --text: #eceef2;
  --muted: #9aa1ae;
  --accent: #db4028;
  --accent-2: #ff7a55;
  --grad: linear-gradient(120deg, #ff8a5c 0%, #db4028 100%);
  --font-head: "Space Grotesk", "Segoe UI", system-ui, sans-serif;
  --font-body: "Inter", "Segoe UI", system-ui, sans-serif;
  --radius: 20px;
  --container: 1160px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* Jemný šum přes celou stránku */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)'/%3E%3C/svg%3E");
}

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

a { color: inherit; text-decoration: none; }

main { position: relative; z-index: 2; }

.container {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: clamp(20px, 4vw, 36px);
}

h1, h2, h3 {
  font-family: var(--font-head);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

h1 { font-size: clamp(2.4rem, 5.6vw, 4.2rem); }
h2 { font-size: clamp(1.9rem, 3.8vw, 2.9rem); margin-bottom: 24px; max-width: 20ch; }
h3 { font-size: 1.25rem; font-weight: 600; letter-spacing: -0.01em; }

.grad {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.overline {
  font-family: var(--font-head);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent-2);
  margin-bottom: 16px;
}

.section-sub {
  color: var(--muted);
  max-width: 56ch;
  margin-bottom: 40px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 200;
  background: var(--accent);
  color: #fff;
  padding: 10px 18px;
  border-radius: 0 0 12px 0;
}
.skip-link:focus { left: 0; }

/* ============ Tlačítka ============ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 1rem;
  padding: 14px 30px;
  border-radius: 999px;
  transition: transform 0.25s ease, box-shadow 0.25s ease, background 0.25s ease, border-color 0.25s ease;
  will-change: transform;
}

.btn-primary {
  background: var(--grad);
  color: #fff;
  box-shadow: 0 8px 28px rgba(219, 64, 40, 0.35);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 36px rgba(219, 64, 40, 0.5);
}

.btn-ghost {
  border: 1px solid var(--line);
  color: var(--text);
  background: rgba(255, 255, 255, 0.02);
}
.btn-ghost:hover {
  border-color: rgba(255, 138, 92, 0.5);
  transform: translateY(-2px);
}

.btn-small { padding: 10px 22px; font-size: 0.92rem; }

/* ============ Navigace ============ */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  transition: background 0.3s ease, border-color 0.3s ease, backdrop-filter 0.3s ease;
  border-bottom: 1px solid transparent;
}

.nav.scrolled {
  background: rgba(10, 11, 15, 0.72);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom-color: var(--line);
}

.nav-inner {
  display: flex;
  align-items: center;
  gap: 32px;
  height: 76px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-right: auto;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 11px;
  background: var(--grad);
  color: #fff;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  box-shadow: 0 4px 16px rgba(219, 64, 40, 0.4);
}

.brand-name {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.08rem;
  letter-spacing: 0.04em;
}
.brand-name em { font-style: normal; color: var(--accent-2); }
.brand-name .brand-tld { color: var(--muted); font-weight: 500; font-size: 0.85em; }
.brand-name.small { font-size: 0.95rem; }

.nav-links {
  display: flex;
  gap: 28px;
}

.nav-links a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--muted);
  transition: color 0.2s ease;
  position: relative;
  padding: 6px 0;
}
.nav-links a:hover, .nav-links a.active { color: var(--text); }
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  height: 2px;
  width: 100%;
  border-radius: 2px;
  background: var(--grad);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
}
.nav-links a:hover::after, .nav-links a.active::after { transform: scaleX(1); }

.nav-burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: none;
  border: 1px solid var(--line);
  border-radius: 12px;
  cursor: pointer;
}
.nav-burger span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}
.nav-burger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-burger.open span:nth-child(2) { opacity: 0; }
.nav-burger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 90;
  display: grid;
  place-items: center;
  background: rgba(10, 11, 15, 0.92);
  -webkit-backdrop-filter: blur(18px);
  backdrop-filter: blur(18px);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}
.mobile-menu.open { opacity: 1; visibility: visible; }
.mobile-menu nav {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}
.mobile-menu a {
  font-family: var(--font-head);
  font-size: 1.6rem;
  font-weight: 600;
  padding: 10px 20px;
  color: var(--text);
}
.mobile-menu a.mobile-cta {
  margin-top: 18px;
  background: var(--grad);
  border-radius: 999px;
  padding: 14px 36px;
  font-size: 1.15rem;
  color: #fff;
}

/* ============ Hero ============ */

.hero {
  position: relative;
  padding: 170px 0 90px;
  overflow: clip;
}

.hero-glow {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(600px 420px at 18% 12%, rgba(219, 64, 40, 0.16), transparent 70%),
    radial-gradient(700px 520px at 88% 68%, rgba(255, 122, 85, 0.10), transparent 70%);
}

.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: clamp(40px, 6vw, 80px);
  align-items: center;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--muted);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.03);
  padding: 8px 18px;
  border-radius: 999px;
  margin-bottom: 28px;
}

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-2);
  box-shadow: 0 0 0 0 rgba(255, 122, 85, 0.6);
  animation: pulse 2.4s infinite;
}

@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(255, 122, 85, 0.55); }
  70% { box-shadow: 0 0 0 10px rgba(255, 122, 85, 0); }
  100% { box-shadow: 0 0 0 0 rgba(255, 122, 85, 0); }
}

.hero-sub {
  color: var(--muted);
  font-size: 1.08rem;
  max-width: 54ch;
  margin: 26px 0 36px;
}

.hero-cta { display: flex; flex-wrap: wrap; gap: 14px; }

.hero-photo {
  position: relative;
  max-width: 330px;
  justify-self: end;
  width: 100%;
}

.photo-frame {
  position: relative;
  border-radius: 26px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.55);
}
.photo-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(200deg, rgba(255, 138, 92, 0.12), transparent 45%);
  pointer-events: none;
}
.photo-frame img {
  width: 100%;
  aspect-ratio: 4 / 4.6;
  object-fit: cover;
}

.hero-photo::before {
  content: "";
  position: absolute;
  inset: -12%;
  z-index: -1;
  background: radial-gradient(closest-side, rgba(219, 64, 40, 0.3), transparent 75%);
  filter: blur(10px);
}

.float-chip {
  position: absolute;
  font-family: var(--font-head);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text);
  background: rgba(19, 21, 29, 0.85);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 10px 16px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.45);
  white-space: nowrap;
}
.float-chip strong { color: var(--accent-2); font-weight: 700; }
.chip-top { top: 22px; left: -34px; }
.chip-bottom { bottom: 30px; right: -22px; }

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(20px, 4vw, 48px);
  margin-top: 84px;
  padding-top: 36px;
  border-top: 1px solid var(--line);
}

.stat { display: flex; flex-direction: column; gap: 4px; }

.stat-num {
  font-family: var(--font-head);
  font-size: clamp(1.7rem, 3vw, 2.3rem);
  font-weight: 700;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.stat-label { color: var(--muted); font-size: 0.93rem; max-width: 26ch; }

/* ============ Marquee ============ */

.marquee {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 20px 0;
  overflow: hidden;
  background: var(--bg-alt);
}

.marquee-track {
  display: flex;
  align-items: center;
  gap: 44px;
  width: max-content;
  animation: marquee 32s linear infinite;
}

.marquee-track span {
  font-family: var(--font-head);
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text);
  white-space: nowrap;
}
.marquee-track i {
  font-style: normal;
  color: var(--accent);
  font-size: 0.8rem;
}

@keyframes marquee {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

/* ============ Sekce ============ */

.section { padding: 110px 0; position: relative; }
.section-alt { background: var(--bg-alt); border-block: 1px solid rgba(255,255,255,0.04); }

section { scroll-margin-top: 90px; }

/* ============ Karty služeb ============ */

.cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
  margin-top: 48px;
}

.card {
  position: relative;
  background: linear-gradient(180deg, #151823 0%, #10121a 100%);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 34px 32px;
  overflow: hidden;
  transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}
.card:hover {
  transform: translateY(-5px);
  border-color: rgba(255, 122, 85, 0.35);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
}
.card::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.35s ease;
  background: radial-gradient(420px 320px at var(--mx, 50%) var(--my, 0%), rgba(219, 64, 40, 0.13), transparent 70%);
}
.card:hover::after { opacity: 1; }

.card-icon {
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  border-radius: 15px;
  background: rgba(219, 64, 40, 0.13);
  border: 1px solid rgba(219, 64, 40, 0.28);
  color: var(--accent-2);
  margin-bottom: 22px;
}
.card-icon svg { width: 26px; height: 26px; }

.card h3 { margin-bottom: 12px; }
.card p { color: var(--muted); font-size: 0.97rem; }

.card-tag {
  position: absolute;
  top: 22px;
  right: 22px;
  font-family: var(--font-head);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-2);
  border: 1px solid rgba(219, 64, 40, 0.35);
  background: rgba(219, 64, 40, 0.1);
  padding: 5px 12px;
  border-radius: 999px;
}

/* ============ Postup ============ */

.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
  margin-top: 48px;
}

.step {
  position: relative;
  padding-top: 26px;
  border-top: 1px solid var(--line);
}
.step::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 56px;
  height: 2px;
  background: var(--grad);
  border-radius: 2px;
}

.step-num {
  font-family: var(--font-head);
  font-size: 2.4rem;
  font-weight: 700;
  line-height: 1;
  display: block;
  margin-bottom: 14px;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  opacity: 0.9;
}

.step h3 { font-size: 1.1rem; margin-bottom: 10px; }
.step p { color: var(--muted); font-size: 0.94rem; }

/* ============ O mně ============ */

.about-grid {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: clamp(40px, 6vw, 80px);
  align-items: center;
}

.about-photo { max-width: 420px; width: 100%; }

.photo-frame-tall img {
  aspect-ratio: 3 / 3.8;
  object-fit: cover;
  object-position: 50% 14%;
}

.about-text h2 { max-width: none; }
.about-text > p { color: var(--muted); margin-bottom: 18px; max-width: 58ch; }

.checklist {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px 28px;
  margin-top: 28px;
}

.checklist li {
  position: relative;
  padding-left: 34px;
  font-size: 0.96rem;
  line-height: 1.55;
}
.checklist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 2px;
  width: 21px;
  height: 21px;
  border-radius: 7px;
  background: rgba(219, 64, 40, 0.14) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23ff8a5c' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M20 6 9 17l-5-5'/%3E%3C/svg%3E") center / 12px no-repeat;
  border: 1px solid rgba(219, 64, 40, 0.3);
}

/* ============ Technologie ============ */

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  max-width: 720px;
}

.chip {
  font-family: var(--font-head);
  font-weight: 500;
  font-size: 0.98rem;
  padding: 12px 22px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.03);
  transition: border-color 0.25s ease, transform 0.25s ease, background 0.25s ease;
}
.chip:hover {
  border-color: rgba(255, 122, 85, 0.55);
  background: rgba(219, 64, 40, 0.09);
  transform: translateY(-2px);
}

.chip-link {
  display: inline-flex;
  align-items: center;
  gap: 9px;
}
.chip-link span {
  color: var(--accent-2);
  font-size: 0.85em;
  transition: transform 0.25s ease;
}
.chip-link:hover span { transform: translate(2px, -2px); }

/* ============ Kontakt ============ */

.contact {
  padding: 150px 0 140px;
  overflow: clip;
}

.contact-glow {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(700px 480px at 50% 60%, rgba(219, 64, 40, 0.14), transparent 70%);
}

.contact-inner {
  position: relative;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.contact h2 { max-width: none; }

.contact-sub {
  color: var(--muted);
  max-width: 52ch;
  margin: 6px 0 40px;
}

.contact-mail {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(1.5rem, 4.5vw, 2.6rem);
  letter-spacing: -0.01em;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  border-bottom: 2px solid rgba(219, 64, 40, 0.4);
  padding-bottom: 6px;
  transition: border-color 0.25s ease, transform 0.25s ease;
}
.contact-mail:hover {
  border-color: var(--accent-2);
  transform: translateY(-2px);
}

.contact-phone {
  font-family: var(--font-head);
  font-weight: 600;
  font-size: clamp(1.15rem, 3vw, 1.5rem);
  color: var(--text);
  margin-top: 26px;
  transition: color 0.25s ease;
}
.contact-phone:hover { color: var(--accent-2); }

/* ============ Patička ============ */

.footer {
  border-top: 1px solid var(--line);
  padding: 30px 0;
  background: var(--bg-alt);
  position: relative;
  z-index: 2;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  color: var(--muted);
  font-size: 0.9rem;
}

.footer-note { opacity: 0.75; transition: color 0.2s ease, opacity 0.2s ease; }
a.footer-note:hover { opacity: 1; color: var(--accent-2); }

/* ============ Animace při scrollu ============ */

.js .reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.7s ease, transform 0.7s cubic-bezier(0.2, 0.65, 0.3, 1);
}
.js .reveal.in {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .js .reveal { opacity: 1; transform: none; transition: none; }
  .marquee-track { animation: none; }
  .dot { animation: none; }
  .btn, .card, .chip, .contact-mail { transition: none; }
}

/* ============================================================
   Responzivita
   ============================================================ */

@media (max-width: 1020px) {
  .hero-grid { grid-template-columns: 1fr 0.9fr; }
  .chip-top { left: -12px; }
  .chip-bottom { right: -8px; }
}

@media (max-width: 880px) {
  .nav-links, .nav-cta { display: none; }
  .nav-burger { display: flex; }

  .hero { padding: 130px 0 70px; }
  .hero-grid { grid-template-columns: 1fr; gap: 56px; }
  .hero-photo { justify-self: center; max-width: 300px; }
  .chip-top { left: 10px; top: 16px; }
  .chip-bottom { right: 10px; bottom: 18px; }

  .hero-stats { margin-top: 64px; }

  .section { padding: 84px 0; }

  .steps { grid-template-columns: repeat(2, 1fr); gap: 34px 22px; }

  .about-grid { grid-template-columns: 1fr; gap: 48px; }
  .about-photo { max-width: 420px; margin-inline: auto; }
  .about-photo .photo-frame-tall img { aspect-ratio: 4 / 4.2; object-position: 50% 10%; }
}

@media (max-width: 680px) {
  .cards { grid-template-columns: 1fr; }
  .hero-stats { grid-template-columns: 1fr; gap: 22px; }
  .stat { flex-direction: row; align-items: baseline; gap: 14px; }
  .stat-label { max-width: none; }
  .checklist { grid-template-columns: 1fr; }
  .contact { padding: 110px 0 100px; }
  .footer-inner { flex-direction: column; text-align: center; gap: 8px; }
}

@media (max-width: 460px) {
  .steps { grid-template-columns: 1fr; }
  .hero-cta .btn { width: 100%; }
  .float-chip { font-size: 0.78rem; padding: 8px 12px; }
}