/* ==========================================================================
   Na-Net.cz — Hlavní stylesheet
   ========================================================================== */

/* ---------- Barevné schéma: Light (výchozí) ---------- */
:root {
  --bg-p: #f7f8fc;
  --bg-s: #fff;
  --bg-t: #eef1f6;
  --bg-c: #fff;
  --bg-ch: #f0f3f9;
  --bg-nav: rgba(255,255,255,.88);
  --bd: #e0e4ed;
  --bd-l: #eaecf2;
  --bd-h: #c8cdd8;
  --t1: #1a1f36;
  --t2: #4a5068;
  --t3: #6b7280;
  --tm: #9ca3af;
  --bl: #2563eb;
  --bl-l: #3b82f6;
  --bl-bg: rgba(37,99,235,.06);
  --bl-bd: rgba(37,99,235,.15);
  --rd: #dc2626;
  --rd-bg: rgba(220,38,38,.06);
  --gn: #059669;
  --gn-bg: rgba(5,150,105,.06);
  --gn-bd: rgba(5,150,105,.15);
  --sh-s: 0 1px 3px rgba(0,0,0,.04);
  --sh-m: 0 4px 20px rgba(0,0,0,.06);
  --sh-l: 0 12px 40px rgba(0,0,0,.08);
  --lf: none;
}

/* ---------- Barevné schéma: Dark ---------- */
[data-theme="dark"] {
  --bg-p: #0f1219;
  --bg-s: #171c28;
  --bg-t: #1e2433;
  --bg-c: #1a2030;
  --bg-ch: #212840;
  --bg-nav: rgba(15,18,25,.9);
  --bd: #2a3040;
  --bd-l: #232a3a;
  --bd-h: #3a4258;
  --t1: #eef0f6;
  --t2: #a0a8c0;
  --t3: #6b7898;
  --tm: #4a5570;
  --bl: #4d8cf7;
  --bl-l: #6da3ff;
  --bl-bg: rgba(77,140,247,.08);
  --bl-bd: rgba(77,140,247,.2);
  --rd: #f87171;
  --rd-bg: rgba(248,113,113,.08);
  --gn: #34d399;
  --gn-bg: rgba(52,211,153,.08);
  --gn-bd: rgba(52,211,153,.2);
  --sh-s: 0 1px 3px rgba(0,0,0,.2);
  --sh-m: 0 4px 20px rgba(0,0,0,.3);
  --sh-l: 0 12px 40px rgba(0,0,0,.4);
  --lf: brightness(0) invert(1);
}

/* ---------- Auto dark (systémové nastavení) ---------- */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg-p: #0f1219;
    --bg-s: #171c28;
    --bg-t: #1e2433;
    --bg-c: #1a2030;
    --bg-ch: #212840;
    --bg-nav: rgba(15,18,25,.9);
    --bd: #2a3040;
    --bd-l: #232a3a;
    --bd-h: #3a4258;
    --t1: #eef0f6;
    --t2: #a0a8c0;
    --t3: #6b7898;
    --tm: #4a5570;
    --bl: #4d8cf7;
    --bl-l: #6da3ff;
    --bl-bg: rgba(77,140,247,.08);
    --bl-bd: rgba(77,140,247,.2);
    --rd: #f87171;
    --rd-bg: rgba(248,113,113,.08);
    --gn: #34d399;
    --gn-bg: rgba(52,211,153,.08);
    --gn-bd: rgba(52,211,153,.2);
    --sh-s: 0 1px 3px rgba(0,0,0,.2);
    --sh-m: 0 4px 20px rgba(0,0,0,.3);
    --sh-l: 0 12px 40px rgba(0,0,0,.4);
    --lf: brightness(0) invert(1);
  }
}

/* ---------- Reset & základ ---------- */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Outfit', sans-serif;
  background: var(--bg-p);
  color: var(--t1);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background .3s, color .3s;
}

/* ---------- Navigace ---------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  padding: 0 2rem;
  background: var(--bg-nav);
  backdrop-filter: blur(24px); -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid var(--bd-l);
  transition: all .3s;
}
.nav-inner {
  max-width: 1140px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  height: 68px;
}
.nav-logo { display: flex; align-items: center; text-decoration: none; }
.nav-logo img { height: 36px; filter: var(--lf); transition: filter .3s; }
.nav-links { display: flex; align-items: center; gap: .15rem; list-style: none; }
.nav-links a {
  color: var(--t2); text-decoration: none;
  font-size: .85rem; font-weight: 500;
  padding: .45rem .75rem; border-radius: 8px;
  transition: all .2s;
}
.nav-links a:hover { color: var(--t1); background: var(--bg-t); }
.nav-cta { background: var(--bl) !important; color: #fff !important; font-weight: 600 !important; padding: .45rem 1.1rem !important; }
.nav-cta:hover { opacity: .9; }
.theme-toggle {
  background: var(--bg-t); border: 1px solid var(--bd); color: var(--t2);
  width: 36px; height: 36px; border-radius: 10px; cursor: pointer;
  font-size: 1rem; display: flex; align-items: center; justify-content: center;
  transition: all .2s; margin-left: .5rem;
}
.theme-toggle:hover { background: var(--bg-ch); border-color: var(--bd-h); }
.nav-toggle { display: none; background: none; border: none; color: var(--t1); font-size: 1.4rem; cursor: pointer; padding: .5rem; }

/* ---------- Hero ---------- */
.hero { padding: 9rem 2rem 5rem; text-align: center; position: relative; overflow: hidden; }
.hero::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 100%;
  background: radial-gradient(ellipse 70% 50% at 50% 0%, var(--bl-bg) 0%, transparent 70%);
  pointer-events: none;
}
.hero-inner { max-width: 780px; margin: 0 auto; position: relative; z-index: 1; }
.hero-logo { margin-bottom: 2rem; }
.hero-logo img { height: 80px; filter: var(--lf); transition: filter .3s; }
.hero-badge {
  display: inline-flex; align-items: center; gap: .5rem;
  background: var(--gn-bg); border: 1px solid var(--gn-bd);
  padding: .35rem 1rem; border-radius: 100px;
  font-size: .8rem; color: var(--gn); margin-bottom: 2rem; font-weight: 500;
}
.hero-badge::before {
  content: ''; width: 7px; height: 7px; background: var(--gn);
  border-radius: 50%; animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: .3; } }
.hero h1 { font-size: clamp(2.2rem,5vw,3.4rem); font-weight: 800; line-height: 1.15; margin-bottom: 1.25rem; letter-spacing: -1.5px; }
.hero h1 .accent { color: var(--bl); }
.hero-desc { font-size: 1.1rem; color: var(--t2); margin-bottom: 2.5rem; line-height: 1.7; max-width: 560px; margin-left: auto; margin-right: auto; }
.hero-actions { display: flex; gap: .75rem; justify-content: center; flex-wrap: wrap; }

/* ---------- Tlačítka ---------- */
.btn {
  display: inline-flex; align-items: center; gap: .5rem;
  padding: .8rem 1.6rem; border-radius: 12px;
  font-size: .92rem; font-weight: 600; text-decoration: none;
  transition: all .2s; border: none; cursor: pointer;
  font-family: 'Outfit', sans-serif;
}
.btn-primary { background: var(--bl); color: #fff; box-shadow: 0 2px 12px rgba(37,99,235,.25); }
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 4px 20px rgba(37,99,235,.35); }
.btn-outline { background: var(--bg-s); color: var(--t1); border: 1px solid var(--bd); box-shadow: var(--sh-s); }
.btn-outline:hover { border-color: var(--bd-h); box-shadow: var(--sh-m); }

/* ---------- Statistiky ---------- */
.stats-strip { display: grid; grid-template-columns: repeat(4,1fr); gap: 1rem; max-width: 700px; margin: 3.5rem auto 0; }
.stat-item { text-align: center; }
.stat-number { font-family: 'JetBrains Mono', monospace; font-size: 1.6rem; font-weight: 700; line-height: 1; margin-bottom: .3rem; }
.stat-label { font-size: .72rem; color: var(--tm); text-transform: uppercase; letter-spacing: 1.5px; font-weight: 500; }

/* ---------- Sekce (společné) ---------- */
section { padding: 5rem 2rem; }
.section-inner { max-width: 1140px; margin: 0 auto; }
.section-label { font-family: 'JetBrains Mono', monospace; font-size: .7rem; text-transform: uppercase; letter-spacing: 3px; color: var(--bl); margin-bottom: .5rem; font-weight: 600; }
.section-title { font-size: clamp(1.6rem,3vw,2.2rem); font-weight: 700; letter-spacing: -.5px; margin-bottom: .75rem; }
.section-desc { color: var(--t2); font-size: 1rem; max-width: 560px; margin-bottom: 2.5rem; }
.alt-bg { background: var(--bg-s); }

/* ---------- Tarify ---------- */
.pricing-cards { display: grid; grid-template-columns: repeat(auto-fit,minmax(280px,1fr)); gap: 1.25rem; }
.pricing-card { background: var(--bg-c); border: 1px solid var(--bd); border-radius: 16px; padding: 2rem; transition: all .25s; position: relative; box-shadow: var(--sh-s); }
.pricing-card:hover { border-color: var(--bd-h); box-shadow: var(--sh-l); transform: translateY(-3px); }
.pricing-card.featured { border-color: var(--bl); box-shadow: 0 4px 24px rgba(37,99,235,.12); }
.pricing-card.featured::before {
  content: 'Nejoblíbenější'; position: absolute; top: -11px; left: 50%; transform: translateX(-50%);
  background: var(--bl); color: #fff; font-size: .65rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: 1px; padding: .25rem .9rem; border-radius: 100px; white-space: nowrap;
}
.pricing-name { font-family: 'JetBrains Mono', monospace; font-size: .78rem; color: var(--tm); text-transform: uppercase; letter-spacing: 2px; margin-bottom: .75rem; }
.pricing-speed { font-size: 2rem; font-weight: 700; line-height: 1; margin-bottom: .2rem; }
.pricing-speed small { font-size: .85rem; color: var(--t3); font-weight: 400; }
.pricing-upload { font-size: .85rem; color: var(--t3); margin-bottom: 1.25rem; }
.pricing-divider { height: 1px; background: var(--bd-l); margin: 1.25rem 0; }
.pricing-price { display: flex; align-items: baseline; gap: .2rem; margin-bottom: .15rem; }
.pricing-amount { font-size: 1.9rem; font-weight: 700; font-family: 'JetBrains Mono', monospace; }
.pricing-currency { font-size: .85rem; color: var(--t3); }
.pricing-period { font-size: .78rem; color: var(--tm); margin-bottom: 1.25rem; }
.pricing-features { list-style: none; margin-bottom: 1.5rem; }
.pricing-features li { font-size: .88rem; color: var(--t2); padding: .3rem 0; display: flex; align-items: center; gap: .5rem; }
.pricing-features li::before { content: '✓'; color: var(--gn); font-weight: 700; font-size: .85rem; }
.pricing-btn { display: block; text-align: center; padding: .7rem; border-radius: 10px; font-weight: 600; font-size: .88rem; text-decoration: none; transition: all .2s; background: var(--bg-t); color: var(--t1); border: 1px solid var(--bd); }
.pricing-btn:hover { background: var(--bg-ch); border-color: var(--bd-h); }
.pricing-card.featured .pricing-btn { background: var(--bl); color: #fff; border-color: var(--bl); }
.tech-params { margin-top: 2rem; padding: 1.25rem 1.5rem; background: var(--bg-c); border: 1px solid var(--bd); border-radius: 12px; font-size: .8rem; color: var(--t3); line-height: 1.7; }
.tech-params strong { color: var(--t2); }
.tech-params a { color: var(--bl); text-decoration: none; }

/* ---------- Archiv ---------- */
.archive-tabs { display: flex; gap: .4rem; margin-bottom: 2rem; flex-wrap: wrap; }
.archive-tab { padding: .45rem 1rem; border-radius: 8px; background: var(--bg-c); border: 1px solid var(--bd); color: var(--t2); font-size: .82rem; cursor: pointer; transition: all .2s; font-family: 'Outfit', sans-serif; font-weight: 500; }
.archive-tab:hover { border-color: var(--bd-h); }
.archive-tab.active { background: var(--bl); color: #fff; border-color: var(--bl); }
.archive-section { display: none; }
.archive-section.active { display: block; }
.archive-group { margin-bottom: 1.5rem; }
.archive-group-title { font-family: 'JetBrains Mono', monospace; font-size: .68rem; text-transform: uppercase; letter-spacing: 2px; color: var(--tm); margin-bottom: .75rem; padding-bottom: .5rem; border-bottom: 1px solid var(--bd-l); }
.archive-list { display: grid; gap: .4rem; }
.archive-item { display: flex; align-items: center; gap: .85rem; padding: .75rem 1rem; background: var(--bg-c); border: 1px solid var(--bd-l); border-radius: 10px; text-decoration: none; color: var(--t2); transition: all .2s; font-size: .88rem; }
.archive-item:hover { background: var(--bg-ch); border-color: var(--bd-h); color: var(--t1); }
.archive-item-icon { width: 32px; height: 32px; background: var(--rd-bg); border-radius: 7px; display: flex; align-items: center; justify-content: center; font-size: .6rem; color: var(--rd); font-weight: 700; font-family: 'JetBrains Mono', monospace; flex-shrink: 0; }
.archive-item-name { flex: 1; }
.badge { font-size: .6rem; text-transform: uppercase; letter-spacing: .8px; padding: .18rem .55rem; border-radius: 4px; font-weight: 600; }
.badge-active { background: var(--gn-bg); color: var(--gn); }
.badge-expired { background: var(--bg-t); color: var(--tm); }

/* ---------- Dokumenty ---------- */
.docs-grid { display: grid; grid-template-columns: repeat(auto-fill,minmax(300px,1fr)); gap: .75rem; }
.doc-card { display: flex; align-items: center; gap: .85rem; padding: 1rem 1.25rem; background: var(--bg-c); border: 1px solid var(--bd); border-radius: 12px; text-decoration: none; color: var(--t2); transition: all .2s; box-shadow: var(--sh-s); }
.doc-card:hover { border-color: var(--bl); box-shadow: var(--sh-m); color: var(--t1); }
.doc-icon { width: 40px; height: 40px; border-radius: 9px; display: flex; align-items: center; justify-content: center; font-family: 'JetBrains Mono', monospace; font-size: .6rem; font-weight: 700; flex-shrink: 0; background: var(--rd-bg); color: var(--rd); }
.doc-name { font-weight: 500; font-size: .88rem; margin-bottom: .1rem; }
.doc-meta { font-size: .72rem; color: var(--tm); }
details summary { cursor: pointer; font-weight: 600; color: var(--t2); font-size: .92rem; padding: 1rem 0; border-top: 1px solid var(--bd-l); margin-top: 2rem; }

/* ---------- O nás ---------- */
.about-content { display: grid; grid-template-columns: 5fr 3fr; gap: 3rem; }
.about-text { color: var(--t2); font-size: 1rem; line-height: 1.8; }
.about-text p { margin-bottom: 1rem; }
.about-sidebar { display: flex; flex-direction: column; gap: .75rem; }
.info-card { padding: 1rem 1.25rem; background: var(--bg-c); border: 1px solid var(--bd); border-radius: 12px; }
.info-card-label { font-size: .65rem; text-transform: uppercase; letter-spacing: 1.5px; color: var(--tm); margin-bottom: .35rem; font-weight: 600; }
.info-card-value { font-weight: 600; font-size: .95rem; }
.info-card-value a { color: var(--bl); text-decoration: none; }

/* ---------- FAQ ---------- */
.faq-list { max-width: 760px; }
.faq-item { border-bottom: 1px solid var(--bd-l); }
.faq-question { width: 100%; background: none; border: none; padding: 1.15rem 0; color: var(--t1); font-size: .95rem; font-weight: 600; text-align: left; cursor: pointer; display: flex; align-items: center; justify-content: space-between; font-family: 'Outfit', sans-serif; }
.faq-question:hover { color: var(--bl); }
.faq-question::after { content: '+'; font-family: 'JetBrains Mono', monospace; font-size: 1.2rem; color: var(--tm); transition: transform .25s; }
.faq-item.open .faq-question::after { transform: rotate(45deg); }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height .3s ease; }
.faq-item.open .faq-answer { max-height: 500px; }
.faq-answer-inner { padding-bottom: 1.15rem; color: var(--t2); font-size: .9rem; line-height: 1.7; }

/* ---------- Kontakt ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; }
.contact-info { display: flex; flex-direction: column; gap: 1.25rem; }
.contact-item { display: flex; gap: .85rem; align-items: flex-start; }
.contact-icon { width: 40px; height: 40px; background: var(--bl-bg); border: 1px solid var(--bl-bd); border-radius: 10px; display: flex; align-items: center; justify-content: center; font-size: 1rem; flex-shrink: 0; color: var(--bl); }
.contact-item-label { font-size: .68rem; text-transform: uppercase; letter-spacing: 1.5px; color: var(--tm); margin-bottom: .15rem; font-weight: 600; }
.contact-item-value { font-weight: 500; font-size: .95rem; }
.contact-item-value a { color: var(--bl); text-decoration: none; }
.contact-form { display: flex; flex-direction: column; gap: .85rem; }
.form-group label { display: block; font-size: .78rem; color: var(--t3); margin-bottom: .3rem; font-weight: 500; }
.form-group input, .form-group textarea { width: 100%; padding: .7rem .9rem; background: var(--bg-c); border: 1px solid var(--bd); border-radius: 10px; color: var(--t1); font-size: .88rem; font-family: 'Outfit', sans-serif; transition: border-color .2s; }
.form-group input:focus, .form-group textarea:focus { outline: none; border-color: var(--bl); }
.form-group textarea { resize: vertical; min-height: 110px; }

/* ---------- Footer ---------- */
.footer { border-top: 1px solid var(--bd); padding: 2.5rem 2rem; background: var(--bg-s); }
.footer-inner { max-width: 1140px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 1rem; }
.footer-left { display: flex; align-items: center; gap: 1.5rem; }
.footer-logo img { height: 40px; filter: var(--lf); transition: filter .3s; }
.footer-copy { font-size: .78rem; color: var(--tm); }
.footer-links { display: flex; gap: 1.5rem; }
.footer-links a { color: var(--t3); text-decoration: none; font-size: .78rem; transition: color .2s; }
.footer-links a:hover { color: var(--t1); }

/* ---------- Responzivita ---------- */
@media (max-width: 968px) {
  .about-content, .contact-grid { grid-template-columns: 1fr; }
  .stats-strip { grid-template-columns: repeat(2,1fr); }
}
@media (max-width: 768px) {
  .nav-links { display: none; position: absolute; top: 68px; left: 0; right: 0; background: var(--bg-nav); backdrop-filter: blur(24px); flex-direction: column; padding: .75rem 1.5rem 1.5rem; border-bottom: 1px solid var(--bd); }
  .nav-links.open { display: flex; }
  .nav-toggle { display: block; }
  .hero { padding: 7rem 1.5rem 3rem; }
  section { padding: 3.5rem 1.5rem; }
  .pricing-cards, .docs-grid { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; text-align: center; }
  .footer-left { flex-direction: column; }
  .footer-links { flex-wrap: wrap; justify-content: center; }
  .stats-strip { grid-template-columns: repeat(2,1fr); gap: .75rem; }
}

/* ---------- Animace ---------- */
.fade-in { opacity: 0; transform: translateY(16px); transition: all .5s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* ---------- Mobilní sticky CTA ---------- */
.mobile-cta {
  display: none; position: fixed; bottom: 0; left: 0; right: 0; z-index: 999;
  padding: .5rem .75rem; gap: .5rem;
  background: var(--bg-nav); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  border-top: 1px solid var(--bd);
  box-shadow: 0 -4px 20px rgba(0,0,0,.1);
  transform: translateY(100%); transition: transform .3s ease;
}
.mobile-cta.visible { transform: translateY(0); }
.mobile-cta-btn {
  flex: 1; display: flex; align-items: center; justify-content: center; gap: .4rem;
  padding: .7rem .75rem; border-radius: 10px; font-weight: 600; font-size: .85rem;
  text-decoration: none; text-align: center;
}
.mobile-cta-call { background: var(--gn-bg); color: var(--gn); border: 1px solid var(--gn-bd); }
.mobile-cta-form { background: var(--bl); color: #fff; }
@media (max-width: 768px) {
  .mobile-cta { display: flex; }
  footer.footer { padding-bottom: 4.5rem; }
}