:root{
  --bg-page: #f5f6fa;
  --card-bg: #ffffff;
  --card-shadow: rgba(0,0,0,0.1);
  --text-color: #222222;
  --accent1: #4facfe;
  --accent2: #00f2fe;
  --button-text: #ffffff;
}

/* Загальні стилі */
*{box-sizing:border-box}
html,body{height:100%;margin:0;font-family:Inter, sans-serif;}
body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 32px;

  /* Градієнт більший за екран */
  background: linear-gradient(120deg, #e0f7fa, #fdfbfb, #e3f2fd);
  background-size: 200% 200%;

  /* Анімація руху */
  animation: gradientMove 15s ease infinite;

  font-family: Inter, sans-serif;
  color: #222;
}

@keyframes gradientMove {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}



/* Контейнер */
.container{
  background: var(--card-bg);
  border-radius: 18px;
  padding: 48px 40px;
  width: 100%;
  max-width: 700px;
  box-shadow: 0 10px 30px var(--card-shadow);
  text-align: center;
}

/* Заголовок */
.logo{
  margin:0 0 20px 0;
  font-size: 34px;
  font-weight: 700;
  background: linear-gradient(90deg,var(--accent1),var(--accent2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Поле вводу */
.input-row{
  gap:16px;
  display:flex;
  flex-direction: row;
  align-items:center;
  justify-content:center;
  margin-bottom:8px;
}
.input-row input{
  width: 100%;
  padding:14px 16px;
  border-radius:12px;
  border:1px solid #ccc;
  background: #fefefe;
  color: var(--text-color);
  outline:none;
  font-size:16px;
  box-shadow: inset 0 2px 8px rgba(0,0,0,0.05);
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.input-row input:focus{
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(0,0,0,0.1);
  border-color: var(--accent1);
}

/* Кнопки */
button{
  cursor:pointer;
  border:0;
  padding:10px 16px;
  border-radius:12px;
  font-weight:600;
  font-size:14px;
  transition: transform .18s ease, box-shadow .18s ease;
}

button.primary {
  background: linear-gradient(90deg, #4facfe, #00f2fe, #4facfe);
  background-size: 200% 200%;
  animation: buttonGradientMove 6s ease infinite;

  color: #ffffff;
  border: 0;
  padding: 12px 20px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;

  box-shadow: 0 6px 18px rgba(0,0,0,0.15);
  transition: transform .2s ease, box-shadow .2s ease;
}

button.primary:hover {
  transform: translateY(-3px) scale(1.03);
  box-shadow: 0 10px 25px rgba(0,0,0,0.2);
}

@keyframes buttonGradientMove {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}


button.secondary{
  background: #f1f1f1;
  color: var(--text-color);
  padding:10px 14px;
  border:1px solid #ddd;
  box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}
button.secondary:hover{ transform: translateY(-2px); }

/* Підказка */
.hint {
  margin-top: 16px;
  font-size: 14px;
  line-height: 1.5;
  color: #333;
  background: linear-gradient(135deg, #fdfbfb 0%, #ebedee 100%);
  padding: 12px 18px;
  border-radius: 12px;
  border: 1px solid #e0e0e0;
  box-shadow: inset 0 2px 6px rgba(0,0,0,0.04),
              0 4px 12px rgba(0,0,0,0.06);
  max-width: 540px;
  margin-left: auto;
  margin-right: auto;
  text-align: center;
  font-weight: 500;
  position: relative;
}

.hint::before {
  content: "💡";
  margin-right: 8px;
  font-size: 16px;
}


/* Модаль */
.modal{
  position:fixed; inset:0; display:flex; align-items:center; justify-content:center;
  background: rgba(0,0,0,0.15);
  z-index:50;
  padding:28px;
  transition: opacity .18s ease;
}
.hidden{ display:none; }

.modal-card{
  width:400px;
  max-width:92%;
  border-radius:14px;
  padding:18px 18px 14px 18px;
  background: var(--card-bg);
  box-shadow: 0 20px 50px rgba(0,0,0,0.1);
  backdrop-filter: blur(4px);
  transform-origin:center;
  animation: popIn .38s cubic-bezier(.16,.9,.3,1);
  position:relative;
}

/* Анімація */
@keyframes popIn{
  from{ transform: translateY(-20px) scale(.95); opacity:0 }
  to{ transform: translateY(0) scale(1); opacity:1 }
}

/* Закриття */
.modal-close{
  position:absolute; right:12px; top:8px;
  background:transparent; color: var(--text-color);
  font-size:22px; line-height:1; width:36px; height:36px; border-radius:10px;
  display:inline-flex; align-items:center; justify-content:center;
  transition: transform .12s ease, background .12s ease;
}
.modal-close:hover{ transform:scale(1.06); background: rgba(0,0,0,0.03); }

/* Modal header */
.modal-header h2 { margin:6px 0 8px 0; font-size:18px; color: var(--text-color) }

/* Центрування контенту модалки */
.modal-body {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

/* QR wrap */
.qrcode-wrap{
  margin: 0 auto 8px auto;
  display: block;
  padding:12px;
  background:#ffffff;
  border-radius:10px;
  box-shadow: 0 8px 30px rgba(0,0,0,0.08);
}

/* Meta */
.meta { margin-top:10px; display:flex; flex-direction:column; align-items:center; text-align:center; gap:8px; }
.meta-line label{ font-size:12px; opacity:0.7; display:block; margin-bottom:6px; color: #555 }
.meta-text{
  max-width:500px;
  word-break: break-word;
  background: #f7f7f7;
  padding:8px 12px;
  border-radius:10px;
  border:1px solid #ddd;
  font-size:13px;
  color: #222;
  box-shadow: inset 0 2px 4px rgba(0,0,0,0.05);
}

/* Footer */
.modal-footer{ margin-top:12px; display:flex; justify-content:center; gap:12px; }

/* Toast */
.toast{
  position:fixed; left:50%; transform:translateX(-50%) translateY(0); bottom:28px;
  background: rgba(0,0,0,0.6);
  color:#fff; padding:10px 16px; border-radius:12px; box-shadow: 0 8px 24px rgba(0,0,0,0.1);
  font-weight:600; z-index:80; opacity:0; transition: opacity .18s ease, transform .18s ease;
}
.toast.show{ opacity:1; transform: translateX(-50%) translateY(0); }

/* Блок Install App */
/* Блок Install App */
.install-card {
  margin: 24px auto 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 16px 18px;
  border-radius: 14px;

  /* М’який фон */
  background: linear-gradient(135deg, #fffdfd, #fdf3f3);
  border: 1px solid #f1dcdc;
  box-shadow: 0 6px 18px rgba(0,0,0,0.05);

  max-width: 540px;
  text-align: left;

  /* Тонка чорна лінія зверху */
  border-top: 2px solid #000;
}


/* Текст */
.install-card .install-text {
  font-size: 15px;
  color: #333;
  font-weight: 500;
  line-height: 1.4;
  flex: 1;
}

/* Кнопка (червоний градієнт) */
button.primary.danger {
  background: linear-gradient(90deg, #ff6b6b, #ff4757, #ff6b6b);
  background-size: 200% 200%;
  animation: buttonGradientMove 6s ease infinite;

  color: #fff;
  border: 0;
  padding: 12px 20px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;

  box-shadow: 0 6px 18px rgba(0,0,0,0.15);
  transition: transform .2s ease, box-shadow .2s ease;
}

button.primary.danger:hover {
  transform: translateY(-3px) scale(1.03);
  box-shadow: 0 10px 25px rgba(0,0,0,0.2);
}

/* Тонка лінія між блоками */
.divider {
  border: none;
  border-top: 1px solid rgba(0,0,0,0.15);
  margin: 24px auto;
  max-width: 540px;
}

/* 📱 Мобільна адаптація */
@media (max-width: 600px) {
  body {
    padding: 16px;
  }

  .container {
    padding: 24px 18px;
    border-radius: 14px;
  }

  .logo {
    font-size: 26px;
  }

  /* Інпут + кнопка одна під одною */
  .input-row {
    flex-direction: column;
    gap: 10px;
  }

  .input-row input {
    font-size: 15px;
    padding: 12px 14px;
  }

  button.primary {
    width: 100%;
    font-size: 15px;
    padding: 12px 0;
  }

  /* Hint */
  .hint {
    font-size: 13px;
    padding: 10px 14px;
  }

  /* Install card */
  .install-card {
    flex-direction: column;
    align-items: stretch;
    text-align: center;
    gap: 10px;
    padding: 14px;
  }

  .install-card .install-text {
    font-size: 14px;
  }

  .install-card #installBtn {
    width: 100%;
  }

  /* Modal */
  .modal-card {
    width: 100%;
    max-width: 95%;
    padding: 14px;
  }

  .modal-header h2 {
    font-size: 16px;
  }

  .meta-text {
    font-size: 12px;
  }
}

/* Головна хвиля */
.wave {
  position: fixed;
  left: 50%;
  top: 50%;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(79,172,254,0.5), transparent 70%);
  transform: translate(-50%, -50%) scale(0);
  pointer-events: none;
  z-index: 999;
  animation: waveExpand 1.4s ease-out forwards;
}

@keyframes waveExpand {
  0% { transform: translate(-50%, -50%) scale(0); opacity: 1; }
  50% { opacity: 0.8; }
  100% { transform: translate(-50%, -50%) scale(27); opacity: 0; }
}

/* Частинки */
.particle {
  position: fixed;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(79,172,254,1);
  pointer-events: none;
  z-index: 1000;
  animation: particleMove 1.2s ease-out forwards;
  box-shadow: 0 0 12px rgba(79,172,254,0.9), 0 0 24px rgba(0,242,254,0.7);
}

@keyframes particleMove {
  0% {
    transform: translate(0,0) scale(1.2);
    opacity: 1;
  }
  100% {
    transform: translate(var(--dx), var(--dy)) scale(0.4);
    opacity: 0;
  }
}

#installPrompt {
  display: none;
}