/* === ZÁKLADNÍ NASTAVENÍ === */

* {

  box-sizing: border-box;

  margin: 0;

  padding: 0;

}



html, body {

  font-family: 'Inter', 'Segoe UI', Roboto, sans-serif;

  font-size: 16px;

  line-height: 1.6;

  scroll-behavior: smooth;

  transition: background-color 0.6s ease, color 0.6s ease;

}



body {

  background-color: #151b28;

  color: #e5e7eb;

  overflow-x: hidden;

}



/* === HLAVIČKA - SJEDNOCENÁ S HLAVNÍM GENERÁTOREM === */

.site-header {

  position: relative;

  background: url("https://www.onlinevyuka.fun/generatorqr/assets/img/header.png") center center / cover no-repeat;

  color: #fff;

  padding: 80px 20px;

  text-align: center;

  border-bottom: 1px solid rgba(255,255,255,0.1);

  transition: background-color 0.6s ease, color 0.6s ease;

  width: 100%;

  max-width: 100%;

  box-sizing: border-box;

}



.site-header::before {

  content: "";

  position: absolute;

  inset: 0;

  background: rgba(0, 0, 0, 0.55);

  backdrop-filter: brightness(0.9);

  z-index: 1;

}



.header-inner {

  position: relative;

  z-index: 2;

  max-width: 1200px;

  margin: 0 auto;

}



.brand {

  position: relative;

}



/* === Logo === */

.site-header img.site-logo {

  width: 220px;

  height: auto;

  margin-bottom: 14px;

  filter: drop-shadow(0 2px 4px rgba(0,0,0,0.4));

  transition: transform 0.3s ease, filter 0.6s ease;

  display: block;

  margin-left: auto;

  margin-right: auto;

}



.site-header img.site-logo:hover {

  transform: scale(1.05);

}



.site-header h1 {

  font-size: 1.9rem;

  font-weight: 700;

  color: #ffffff;

  text-shadow: 0 2px 4px rgba(0,0,0,0.5);

  transition: color 0.6s ease;

  margin: 10px 0;

}



.site-header .subtitle {

  font-size: 1rem;

  color: #e0e7ff;

  text-shadow: 0 1px 3px rgba(0,0,0,0.5);

  transition: color 0.6s ease;

  margin-top: 5px;

}



/* === TLAČÍTKO ZPĚT === */

.btn-back {

  position: absolute;

  top: 20px;

  right: 20px;

  background: linear-gradient(135deg, #2563eb, #06b6d4);

  color: #fff !important;

  padding: 8px 14px;

  border-radius: 10px;

  text-decoration: none;

  font-size: 14px;

  font-weight: 600;

  border: none;

  cursor: pointer;

  box-shadow: 0 4px 15px rgba(59,130,246,0.4);

  transition: all 0.3s ease;

  z-index: 10;

}



.btn-back:hover {

  transform: scale(1.05);

  box-shadow: 0 6px 18px rgba(59,130,246,0.6);

}



/* === HLAVNÍ OBSAH === */

.container {

  display: flex;

  flex-wrap: wrap;

  justify-content: center;

  align-items: flex-start;

  gap: 30px;

  padding: 30px;

  max-width: 1200px;

  margin: 0 auto;

  width: 100%;

  box-sizing: border-box;

}



/* === FORMULÁŘ === */

.form-section {

  background: #0b0f16;

  color: #f0f0f0;

  border-radius: 16px;

  box-shadow: 0 10px 25px rgba(0,0,0,0.4);

  padding: 25px;

  width: 100%;

  max-width: 500px;

  transition: background-color 0.6s ease, box-shadow 0.6s ease;

}



label {

  display: block;

  margin-bottom: 12px;

  font-size: 14px;

  color: #cbd5e1;

}



input[type="text"],

input[type="email"],

input[type="url"],

input[type="color"],

input[type="file"] {

  width: 100%;

  padding: 10px 12px;

  border-radius: 8px;

  border: 1px solid #1e2535;

  background: #111826;

  color: #f1f5f9;

  margin-top: 4px;

  transition: all 0.3s ease;

}



input:focus {

  border-color: #3b82f6;

  outline: none;

}



.grid-2 {

  display: grid;

  grid-template-columns: repeat(2, 1fr);

  gap: 12px;

}



/* === TLAČÍTKA === */

.btn {

  display: inline-block;

  padding: 10px 18px;

  margin-top: 15px;

  margin-right: 8px;

  border: none;

  border-radius: 10px;

  font-weight: 600;

  cursor: pointer;

  transition: all 0.3s ease;

}



.btn.primary {

  background: linear-gradient(145deg, #3b82f6, #2563eb);

  color: #fff;

  box-shadow: 0 4px 12px rgba(59,130,246,0.3);

}



.btn.primary:hover {

  background: linear-gradient(145deg, #2563eb, #1e40af);

  transform: translateY(-2px);

  box-shadow: 0 6px 16px rgba(59,130,246,0.5);

}



.btn:not(.primary) {

  background: #1e293b;

  color: #fff;

}



.btn:not(.primary):hover {

  background: #334155;

  transform: translateY(-2px);

}



.btn[disabled] {

  opacity: 0.5;

  cursor: not-allowed;

}



/* === NÁHLED VIZITKY === */

.preview-section {

  background: #ffffff;

  color: #111;

  border-radius: 16px;

  box-shadow: 0 10px 25px rgba(0,0,0,0.25);

  padding: 20px;

  width: 100%;

  max-width: 500px;

  text-align: center;

}



.preview-section h2 {

  font-size: 20px;

  margin-top: 0;

  margin-bottom: 15px;

}



/* === VIZITKA === */

.card {

  background: #f9f9f9;

  border-radius: 16px;

  padding: 15px;

  color: #000;

  width: 100%;

  box-sizing: border-box;

}



.card-inner {

  display: flex;

  flex-wrap: wrap;

  justify-content: space-between;

  align-items: center;

  gap: 15px;

}



.left img {

  width: 100px;

  height: 100px;

  border-radius: 50%;

  background: #eee;

  object-fit: cover;

}



.right {

  flex: 1;

  text-align: left;

  min-width: 180px;

}



.qr-wrap {

  text-align: center;

  margin-top: 10px;

}



/* === PATIČKA - SJEDNOCENÁ S HLAVNÍM GENERÁTOREM === */

.site-footer {

  background: #0f1725;

  color: #94a3b8;

  padding: 30px 20px;

  text-align: center;

  font-size: 0.9rem;

  border-top: 1px solid rgba(255,255,255,0.05);

  transition: background-color 0.6s ease, color 0.6s ease;

}



.footer-inner {

  max-width: 1200px;

  margin: 0 auto;

}



.footer-inner p {

  margin: 8px 0;

}



.footer-inner .small {

  font-size: 0.85rem;

  opacity: 0.9;

}



.site-footer a {

  color: #60a5fa;

  text-decoration: none;

  transition: color 0.3s ease;

}



.site-footer a:hover {

  color: #3b82f6;

  text-decoration: underline;

}



/* === SVĚTLÝ REŽIM === */

body.light-mode {

  background-color: #e9eef6;

  color: #1f2937;

}



body.light-mode .site-header::before {

  background: rgba(255,255,255,0.45);

}



body.light-mode .site-header h1,

body.light-mode .site-header .subtitle {

  color: #1a1a1a;

  text-shadow: none;

}



body.light-mode .form-section {

  background-color: #ffffff;

  color: #1a1a1a;

  box-shadow: 0 4px 25px rgba(0,0,0,0.15);

}



body.light-mode input[type="text"],

body.light-mode input[type="email"],

body.light-mode input[type="url"],

body.light-mode input[type="color"],

body.light-mode input[type="file"] {

  background: #f3f4f6;

  color: #111;

  border: 1px solid #cbd5e1;

}



body.light-mode .btn.primary {

  background: #2563eb;

  color: white;

}



body.light-mode .site-footer {

  background: #f3f4f6;

  color: #4b5563;

}



body.light-mode .site-footer a {

  color: #2563eb;

}



body.light-mode .site-footer a:hover {

  color: #1e40af;

}



/* === RESPONSIVNÍ DESIGN - OPRAVA PRO MOBIL === */

@media (max-width: 768px) {

  /* HLAVIČKA - kompletní přepracování pro mobil */

  .site-header {

    padding: 30px 10px;

    width: 100%;

    max-width: 100%;

  }



  .header-inner {

    width: 100%;

    max-width: 100%;

    padding: 0;

  }



  .brand {

    display: flex;

    flex-direction: column;

    align-items: center;

    gap: 10px;

    width: 100%;

  }



  /* Logo menší pro mobily */

  .site-header img.site-logo {

    width: 160px;

    margin-bottom: 10px;

  }



  .site-header h1 {

    font-size: 1.4rem;

    margin: 8px 0;

  }



  .site-header .subtitle {

    font-size: 0.9rem;

    margin-top: 4px;

  }



  /* Tlačítko Zpět pod hlavičku */

  .btn-back {

    position: relative;

    top: auto;

    right: auto;

    margin-top: 15px;

    width: auto;

    order: 3;

    font-size: 13px;

    padding: 8px 12px;

  }



  /* Hlavní kontejner */

  .container {

    flex-direction: column;

    align-items: center;

    padding: 15px 10px;

    width: 100%;

  }



  .form-section,

  .preview-section {

    width: 100%;

    max-width: 100%;

    margin: 0 0 20px 0;

    padding: 20px 15px;

  }



  /* Grid pro formulář na 1 sloupec */

  .grid-2 {

    grid-template-columns: 1fr;

  }



  /* Vizitka na mobilu */

  .card-inner {

    flex-direction: column;

    align-items: center;

  }



  .right {

    text-align: center;

  }



  .qr-wrap {

    margin-top: 10px;

  }



  /* Patička */

  .site-footer {

    padding: 20px 15px;

  }



  .footer-inner .small {

    font-size: 0.8rem;

  }

}



/* Extra malé displeje */

@media (max-width: 480px) {

  .site-header {

    padding: 25px 5px;

  }



  .site-header img.site-logo {

    width: 140px;

  }



  .site-header h1 {

    font-size: 1.2rem;

  }



  .site-header .subtitle {

    font-size: 0.85rem;

  }



  .btn-back {

    font-size: 12px;

    padding: 6px 10px;

  }



  .form-section,

  .preview-section {

    padding: 15px 10px;

  }

}



/* === ANIMACE PŘEPNUTÍ REŽIMU === */

body {

  transition: background-color 0.4s ease, color 0.4s ease, filter 0.4s ease;

}



body.light-mode {

  filter: brightness(1);

  transition: background-color 0.4s ease, color 0.4s ease, filter 0.4s ease;

}



body.transitioning {

  transition: none;

  animation: fadeTransition 0.4s ease;

}



@keyframes fadeTransition {

  0%   { opacity: 0; transform: scale(1.02); }

  100% { opacity: 1; transform: scale(1); }

}