/* =======================================

   Stylový QR generátor – OnlineVýuka.fun

   Moderní dark/light režim + přechod

   ======================================= */



/* ===== RESET ===== */

* {

  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;

}



/* ===== TMA (výchozí režim) ===== */

body {

  background-color: #151b28;

  color: #e5e7eb;

}



/* ===== KONTEJNERY ===== */

.container {

  width: 90%;

  max-width: 1200px;

  margin: 0 auto;

}



/* ===== HLAVIČKA ===== */

.site-header {

  position: relative;

  background: url("../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;

}



.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;

}



/* === Logo (větší) === */

.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;

}



.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;

}



.site-header .subtitle {

  font-size: 1rem;

  color: #e0e7ff;

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

  transition: color 0.6s ease;

}



/* ===== HLAVNÍ MŘÍŽKA ===== */

.main-grid {

  display: grid;

  grid-template-columns: 2fr 1.5fr 1fr;

  gap: 24px;

  padding: 50px 0;

}



.card,

.form-card,

.preview-card,

.info-card {

  background-color: #0b0f16;

  border-radius: 16px;

  padding: 25px;

  box-shadow: 0 4px 20px rgba(0,0,0,0.35);

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

}



h2, h3 {

  color: #ffffff;

  margin-bottom: 15px;

  transition: color 0.6s ease;

}



/* ===== FORMULÁŘ ===== */

label span {

  display: block;

  font-size: 0.9rem;

  margin-bottom: 6px;

  color: #cbd5e1;

  transition: color 0.6s ease;

}



input, select {

  width: 100%;

  padding: 10px 12px;

  border: 1px solid #1e2535;

  border-radius: 8px;

  background: #111826;

  color: #f1f5f9;

  transition: all 0.3s ease;

}



input:focus, select:focus {

  border-color: #3b82f6;

  outline: none;

}



.actions {

  margin-top: 20px;

  display: flex;

  gap: 12px;

  flex-wrap: wrap;

}



.btn {

  border: none;

  border-radius: 8px;

  padding: 10px 18px;

  font-weight: 600;

  cursor: pointer;

  transition: all 0.25s ease;

}



.btn.primary {

  background: #3b82f6;

  color: #fff;

}



.btn.primary:hover {

  background: #2563eb;

}



.btn.ghost {

  background: transparent;

  color: #94a3b8;

  border: 1px solid #475569;

}



.btn.ghost:hover {

  background: #1e2535;

}



.btn[disabled] {

  opacity: 0.5;

  cursor: not-allowed;

}



/* ===== NÁHLED ===== */

.preview-wrap {

  display: flex;

  align-items: center;

  justify-content: center;

  flex-direction: column;

  height: 100%;

  min-height: 350px;

}



#qrcode, #qrCanvas {

  display: block;

  max-width: 100%;

}



.hidden {

  display: none;

}



.hint {

  color: #64748b;

  font-size: 0.9rem;

  transition: color 0.6s ease;

}



/* ===== INFO PANEL ===== */

.info-card ul {

  list-style: disc;

  padding-left: 20px;

  color: #cbd5e1;

  transition: color 0.6s ease;

}



.info-card li {

  margin-bottom: 8px;

}



.info-card b {

  color: #ffffff;

}



/* ===== REKLAMY A SPODNÍ SEKCE ===== */

.ad-bottom {

  padding: 40px 0;

  text-align: center;

}



.ad-placeholder {

  background: #0b0f16;

  color: #64748b;

  padding: 40px;

  border-radius: 16px;

  border: 1px dashed #2e3547;

}



/* ===== FOOTER ===== */

.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;

}



/* ===== DROBNOSTI ===== */

.sep {

  margin: 25px 0;

  border: none;

  border-top: 1px solid rgba(255,255,255,0.08);

}



.grid-2 {

  display: grid;

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

  gap: 12px;

}



.grid-3 {

  display: grid;

  grid-template-columns: repeat(3, 1fr);

  gap: 12px;

}



/* ===== RESPONSIVE ===== */

@media (max-width: 1100px) {

  .main-grid {

    grid-template-columns: 1fr;

  }

  .form-card, .preview-card, .info-card {

    margin-bottom: 20px;

  }

  .actions {

    justify-content: center;

  }

}



/* =======================================

   SVĚTLÝ REŽIM

   ======================================= */

body.light-mode {

  background-color: #e9eef6;

  color: #1f2937;

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

}



body.light-mode .site-header {

  background: url("../img/header.png") center center / cover no-repeat;

}



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-card,

body.light-mode .preview-card,

body.light-mode .info-card {

  background-color: #ffffff;

  color: #1a1a1a;

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

}



body.light-mode input,

body.light-mode select {

  background: #f3f4f6;

  color: #111;

  border: 1px solid #cbd5e1;

}



body.light-mode .btn.primary {

  background: #2563eb;

  color: white;

}



body.light-mode .btn.ghost {

  color: #374151;

  border-color: #94a3b8;

}



body.light-mode .info-card ul {

  color: #374151;

}



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;

}



/* === Moderněji vypadající hlavní tlačítka (bez změny roložení) === */

.btn {

  border: none;

  border-radius: 10px;

  padding: 10px 18px;

  font-weight: 600;

  cursor: pointer;

  transition: all 0.25s 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.ghost {

  background: transparent;

  color: #94a3b8;

  border: 1px solid #475569;

  box-shadow: none;

}

.btn.ghost:hover {

  background: rgba(255,255,255,0.08);

  color: #fff;

}



.btn[disabled] {

  opacity: 0.5;

  cursor: not-allowed;

}

/* === Styl pro přepínač typu QR === */

.tab-buttons {

  display: flex;

  gap: 8px;

  margin-bottom: 15px;

}



.tab-button {

  flex: 1;

  border: none;

  border-radius: 8px;

  padding: 10px 14px;

  font-weight: 600;

  cursor: pointer;

  color: #fff;

  background: #1e293b;

  transition: all 0.3s ease;

  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.05);

}



/* Hover efekt – jemný rozsvit */

.tab-button:hover {

  filter: brightness(1.2);

  transform: translateY(-1px);

}



/* Aktivní stavy – různé barvy */

.tab-button.active[data-type="url"] {

  background: linear-gradient(135deg, #2563eb, #3b82f6);

  box-shadow: 0 0 12px rgba(59,130,246,0.5);

}



.tab-button.active[data-type="vcard"] {

  background: linear-gradient(135deg, #10b981, #34d399);

  box-shadow: 0 0 12px rgba(16,185,129,0.45);

}



/* Světlý režim */

body.light-mode .tab-button {

  background: #e2e8f0;

  color: #1e293b;

  box-shadow: inset 0 0 0 1px rgba(0,0,0,0.05);

}

body.light-mode .tab-button:hover {

  filter: brightness(0.95);

}

body.light-mode .tab-button.active[data-type="url"] {

  background: linear-gradient(135deg, #2563eb, #60a5fa);

  color: #fff;

  box-shadow: 0 0 12px rgba(59,130,246,0.4);

}

body.light-mode .tab-button.active[data-type="vcard"] {

  background: linear-gradient(135deg, #10b981, #6ee7b7);

  color: #fff;

  box-shadow: 0 0 12px rgba(16,185,129,0.35);

}

/* === Styl původního přepínače (Text/URL vs vCard) === */

.tabs {

  display: flex;

  gap: 8px;

  margin-bottom: 15px;

}



.tabs .tab {

  flex: 1;

  border: none;

  border-radius: 8px;

  padding: 10px 14px;

  font-weight: 600;

  cursor: pointer;

  color: #fff;

  background: #1e293b;

  transition: all 0.25s ease;

  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.05);

}



.tabs .tab:hover {

  filter: brightness(1.1);

  transform: translateY(-1px);

}



/* Aktivní barvy podle cílového panelu */

.tabs .tab.active[data-tab="tab-text"] {

  background: linear-gradient(135deg, #2563eb, #3b82f6);

  box-shadow: 0 0 12px rgba(59,130,246,0.45);

}



.tabs .tab.active[data-tab="tab-vcard"] {

  background: linear-gradient(135deg, #10b981, #34d399);

  box-shadow: 0 0 12px rgba(16,185,129,0.4);

}



/* Světlý režim */

body.light-mode .tabs .tab {

  background: #e2e8f0;

  color: #1e293b;

  box-shadow: inset 0 0 0 1px rgba(0,0,0,0.06);

}



body.light-mode .tabs .tab.active[data-tab="tab-text"] {

  background: linear-gradient(135deg, #2563eb, #60a5fa);

  color: #fff;

  box-shadow: 0 0 12px rgba(59,130,246,0.35);

}



body.light-mode .tabs .tab.active[data-tab="tab-vcard"] {

  background: linear-gradient(135deg, #10b981, #6ee7b7);

  color: #fff;

  box-shadow: 0 0 12px rgba(16,185,129,0.3);

}

/* Tab panely – jistota viditelnosti/skrývání */

.tab-panel { display: none; }

.tab-panel.active { display: block; }

/* Styl pro vCard formulář */

.vcard-grid {

  display: grid;

  grid-template-columns: 1fr 1fr;

  gap: 12px 20px;

  margin-top: 15px;

}



.vcard-grid label {

  display: block;

  font-size: 14px;

  color: var(--text-secondary, #ccc);

  margin-bottom: 4px;

}



.vcard-grid input {

  width: 100%;

  padding: 8px 10px;

  border-radius: 8px;

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

  background-color: rgba(255,255,255,0.05);

  color: #fff;

  transition: border-color 0.2s ease;

}



.vcard-grid input:focus {

  border-color: var(--accent, #4dd0e1);

  outline: none;

}



/* Responsivní chování */

@media (max-width: 768px) {

  .vcard-grid {

    grid-template-columns: 1fr;

  }

}

/* === ANIMACE PŘEPNUTÍ REŽIMU === */

body {

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

}



/* Změkčení přechodu mezi světlým a tmavým */

body.light-mode {

  filter: brightness(1);

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

}



/* Krátký efekt ztmavení při přepnutí */

body.transitioning {

  transition: none;

  animation: fadeTransition 0.4s ease;

}



@keyframes fadeTransition {

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

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

}