/* ================= GLOBAL RESET ================= */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, #0f1430 0%, #1a1f3a 100%);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

/* ================= CONTAINER ================= */
.container {
  width: 100%;
  max-width: 420px;
}

/* ================= LOGIN CARD ================= */
.login-card {
  background: linear-gradient(135deg, #1f2b5a, #131a3a);
  padding: 40px 30px;
  border-radius: 25px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
}

/* ================= HEADER ================= */
.header {
  text-align: center;
  margin-bottom: 35px;
}

.header h1 {
  font-size: 28px;
  color: #ffffff;
  margin-bottom: 8px;
  font-weight: 700;
}

.header p {
  font-size: 14px;
  color: #94a3b8;
  font-weight: 400;
}

/* ================= INPUT GROUPS ================= */
.input-group {
  margin-bottom: 20px;
}

.input-group label {
  display: block;
  color: #e2e8f0;
  font-size: 14px;
  margin-bottom: 8px;
  font-weight: 500;
}

.input-group input {
  width: 100%;
  padding: 14px 16px;
  border: 2px solid #2d3748;
  border-radius: 12px;
  background: #1a202c;
  color: #ffffff;
  font-size: 15px;
  transition: all 0.3s ease;
}

.input-group input:focus {
  outline: none;
  border-color: #3498db;
  background: #252d3d;
}

.input-group input::placeholder {
  color: #64748b;
}

/* ================= ERROR MESSAGE ================= */
.error-msg {
  color: #ef4444;
  font-size: 13px;
  text-align: center;
  margin-bottom: 15px;
  min-height: 18px;
  font-weight: 500;
}

/* ================= LOGIN BUTTON ================= */
.login-btn {
  width: 100%;
  padding: 15px;
  background: linear-gradient(135deg, #3498db, #2980b9);
  color: #ffffff;
  border: none;
  border-radius: 12px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(52, 152, 219, 0.3);
}

.login-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(52, 152, 219, 0.4);
}

.login-btn:active {
  transform: translateY(0);
}

/* ================= REGISTER LINK ================= */
.register-link {
  text-align: center;
  margin-top: 25px;
  padding-top: 20px;
  border-top: 1px solid #2d3748;
}

.register-link p {
  color: #94a3b8;
  font-size: 14px;
}

.register-link a {
  color: #3498db;
  text-decoration: none;
  font-weight: 600;
  transition: color 0.3s ease;
}

.register-link a:hover {
  color: #5dade2;
  text-decoration: underline;
}

/* ================= TELEGRAM CUSTOMER SERVICE BUTTON ================= */
#tg-btn {
  position: fixed;
  bottom: 28px;
  right: 28px;
  width: 58px;
  height: 58px;
  border-radius: 50%;
  background: #29A8E0;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 20px rgba(41, 168, 224, 0.45);
  z-index: 9999;
  text-decoration: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

#tg-btn::before {
  content: '';
  position: absolute;
  width: 58px;
  height: 58px;
  border-radius: 50%;
  background: rgba(41, 168, 224, 0.35);
  animation: tg-pulse 2s ease-out infinite;
  z-index: -1;
}

#tg-btn:hover {
  transform: scale(1.1);
  box-shadow: 0 6px 25px rgba(41, 168, 224, 0.6);
}

#tg-btn img {
  width: 32px;
  height: 32px;
}

/* Tooltip */
.tg-tooltip {
  position: absolute;
  bottom: 68px;
  right: 0;
  background: #ffffff;
  color: #1a202c;
  font-size: 13px;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  font-weight: 500;
  padding: 8px 14px;
  border-radius: 20px;
  white-space: nowrap;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.25s ease, transform 0.25s ease;
  pointer-events: none;
}

/* Tooltip arrow */
.tg-tooltip::after {
  content: '';
  position: absolute;
  bottom: -5px;
  right: 22px;
  width: 9px;
  height: 9px;
  background: #ffffff;
  transform: rotate(45deg);
  box-shadow: 2px 2px 4px rgba(0, 0, 0, 0.08);
}

#tg-btn:hover .tg-tooltip {
  opacity: 1;
  transform: translateY(0);
}

/* Pulse animation */
@keyframes tg-pulse {
  0%   { transform: scale(1);   opacity: 0.6; }
  100% { transform: scale(1.7); opacity: 0;   }
}

/* ================= RESPONSIVE ================= */
@media (max-width: 480px) {
  .login-card {
    padding: 35px 25px;
  }

  .header h1 {
    font-size: 24px;
  }

  #tg-btn {
    bottom: 20px;
    right: 20px;
    width: 52px;
    height: 52px;
  }

  #tg-btn img {
    width: 28px;
    height: 28px;
  }

  .tg-tooltip {
    font-size: 12px;
    padding: 7px 12px;
  }
}