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

html, body {
  width: 100%;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  font-family: Arial, sans-serif;
  overflow: hidden;
}

/* ===================== ТЕМА (тёмная/светлая) ===================== */
body {
  background: radial-gradient(circle at 50% 18%, #1a1d24 0%, #0d0f13 70%);
  transition: background 0.3s ease;
}
body[data-theme="light"] {
  background: radial-gradient(circle at 50% 18%, #ffffff 0%, #dde1e7 70%);
}

#theme-toggle {
  position: fixed;
  top: 16px; right: 18px;
  z-index: 500;
  width: 34px; height: 34px;
  border-radius: 50%;
  border: 1px solid #333a46;
  background: #222a37;
  color: #ccc;
  cursor: pointer;
  font-size: 14px;
  display: flex; align-items: center; justify-content: center;
}
body[data-theme="light"] #theme-toggle {
  border-color: #c7cbd1;
  background: #ffffff;
  color: #555;
}

/* ===================== КАРТОЧКА ПРИЛОЖЕНИЯ ===================== */
#app {
  width: 360px;
  border-radius: 14px;
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.3);
  overflow: hidden;
  background: #1b1e24;
  transition: background 0.3s ease;
}
body[data-theme="light"] #app {
  background: #ffffff;
}

/* ---- бренд-блок ---- */
#brand {
  display: flex; flex-direction: column; align-items: center;
  padding: 26px 24px 16px;
  gap: 6px;
}
.logo-icon {
  position: relative;
  width: 64px; height: 48px; /* пропорции 640:480 исходного лого */
  margin-bottom: 6px;
}
.logo-icon img {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: contain;
}
.logo-icon .logo-dark { mix-blend-mode: screen; display: block; }
.logo-icon .logo-light { mix-blend-mode: multiply; display: none; }
body[data-theme="light"] .logo-icon .logo-dark { display: none; }
body[data-theme="light"] .logo-icon .logo-light { display: block; }

#brand h1 {
  color: #eeeeee;
  font-size: 21px;
  letter-spacing: 3.5px;
  font-weight: 700;
}
#brand .tag {
  color: #7a7f89;
  font-size: 11px;
  letter-spacing: 1.2px;
}
body[data-theme="light"] #brand h1 { color: #1b1d22; }
body[data-theme="light"] #brand .tag { color: #888d97; }

/* Панель вкладок (пока скрыта атрибутом hidden в HTML) */
.tabs {
  display: flex;
  background: transparent;
}
.tabs[hidden] {
  display: none; /* без этого .tabs{display:flex} выше перебивает атрибут hidden */
}
.tab-button {
  flex: 1;
  padding: 12px;
  background: transparent;
  border: none;
  cursor: pointer;
  font-size: 14px;
  color: #9aa0aa;
  transition: background 0.2s;
}
.tab-button:hover { background: rgba(255,255,255,0.05); }
.tab-button.active {
  color: #eee;
  border-bottom: 2px solid #b8362a;
  font-weight: bold;
}
body[data-theme="light"] .tab-button { color: #7a7f89; }
body[data-theme="light"] .tab-button.active { color: #1b1d22; }

/* Содержимое вкладок */
.tab-content { display: none; padding: 4px 22px 24px; }
.tab-content.active { display: block; }

/* Вертикально расположенные кнопки */
.buttons-vertical {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 12px;
}

.action-button {
  padding: 11px;
  font-size: 14px;
  cursor: pointer;
  border: 1px solid #2a2d34;
  border-radius: 8px;
  background-color: #15171c;
  color: #e8e8e8;
  transition: background-color 0.2s, border-color 0.2s;
}
.action-button:hover {
  background-color: #1d2027;
  border-color: #3a3e46;
}
body[data-theme="light"] .action-button {
  background-color: #ffffff;
  border-color: #ccd1d9;
  color: #22242a;
}
body[data-theme="light"] .action-button:hover {
  background-color: #f0f2f5;
  border-color: #aeb4bd;
}

.close-button {
  background-color: #b8362a;
  color: white;
  border-color: #8f2a20;
}
.close-button:hover { background-color: #c73f31; }
body[data-theme="light"] .close-button {
  background-color: #e74c3c;
  border-color: #c0392b;
  color: #fff;
}
body[data-theme="light"] .close-button:hover { background-color: #d8432f; }

/* Панель частоты */
#frequency-panel {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 9px 13px;
  background-color: #15171c;
  border: 1px solid #2a2d34;
  border-radius: 8px;
  margin-bottom: 9px;
}
#frequency-label { font-weight: bold; color: #9aa0aa; font-size: 13px; }
#frequency-value { font-size: 17px; color: #f2f2f2; }
body[data-theme="light"] #frequency-panel { background-color: #ffffff; border-color: #ccd1d9; }
body[data-theme="light"] #frequency-label { color: #7a7f89; }
body[data-theme="light"] #frequency-value { color: #1b1d22; }

/* Панель статуса */
#status-panel {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 9px 13px;
  background-color: #15171c;
  border: 1px solid #2a2d34;
  border-radius: 8px;
}
body[data-theme="light"] #status-panel { background-color: #ffffff; border-color: #ccd1d9; }

.indicator {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  display: inline-block;
}
.indicator-red { background-color: #e74c3c; }
.indicator-green { background-color: #2ecc71; }

#status-text { font-size: 14px; color: #ddd; }
body[data-theme="light"] #status-text { color: #333; }

/* ===================== ИНТРО (двери) ===================== */
#intro-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: #000; /* подстраховка: перекрывает всё, даже пока JS ещё не выставил размеры дверей */
  transform: scale(1.04);
}
#intro-overlay.appear {
  animation: introPop 0.45s cubic-bezier(.2,.9,.3,1) forwards;
}
@keyframes introPop { to { transform: scale(1); } }

.door {
  position: absolute;
  top: 0; bottom: 0;
  overflow: hidden;
  background-color: #000;
  background-repeat: no-repeat;
  transition: transform 1.17s cubic-bezier(.65,0,.35,1);
}
.door-left { left: 0; }
.door-right { left: 0; } /* left/width выставляются из JS под реальный размер окна */

#intro-overlay.open .door-left { transform: translateX(-100%); }
#intro-overlay.open .door-right { transform: translateX(100%); }
#intro-overlay.open {
  transition: opacity 0.45s ease 0.65s;
  opacity: 0;
  pointer-events: none;
}

/* Модальное окно */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.5);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 100;
}

.modal.hidden {
  display: none;
}

.modal-content {
  background: #1b1e24;
  padding: 20px;
  border-radius: 8px;
  width: 300px;
  box-shadow: 0 5px 15px rgba(0,0,0,0.4);
  position: relative;
  color: #eee;
}
body[data-theme="light"] .modal-content {
  background: #ffffff;
  color: #222;
}

.close-modal {
  position: absolute;
  top: 10px;
  right: 15px;
  font-size: 22px;
  cursor: pointer;
  color: #999;
}
.close-modal:hover { color: #eee; }
body[data-theme="light"] .close-modal { color: #777; }
body[data-theme="light"] .close-modal:hover { color: #333; }

.modal-content h3 {
  margin-bottom: 15px;
  text-align: center;
}

.freq-input-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-bottom: 15px;
}

.freq-btn {
  width: 40px;
  height: 40px;
  font-size: 20px;
  background: #b8362a;
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.2s;
}
.freq-btn:hover { background: #c73f31; }

#freq-input {
  width: 100px;
  padding: 8px;
  font-size: 18px;
  text-align: center;
  border: 1px solid #444;
  border-radius: 4px;
  background: #15171c;
  color: #eee;
}
body[data-theme="light"] #freq-input {
  border-color: #ccc;
  background: #fff;
  color: #222;
}

#btn-set-freq {
  display: block;
  width: 100%;
  margin-top: 10px;
}

.error-msg {
  color: #e74c3c;
  margin-top: 8px;
  text-align: center;
  font-size: 14px;
}

.error-msg.hidden {
  display: none;
}