:root {
  --primary: #4caf50;
  --primary-dark: #388e3c;
  --danger: #e53935;
  --bg: #000; /* Black background */
  --card-bg: #111; /* Dark card background */
  --border: #333;
  --text: #4caf50; /* Green text */
  --muted: #888;
  --radius: 10px;
  --shadow: 0 2px 12px rgba(0, 0, 0, 0.07);
}

html, body {
  height: 100%;
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: 'Segoe UI', Arial, sans-serif;
  display: flex;
  justify-content: center;
  align-items: center;
}

.container {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  max-width: 400px;
  margin: 40px auto;
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 32px 24px 24px 24px;
  text-align: center;
}

h1 {
  font-size: 2.1em;
  margin-bottom: 24px;
  font-weight: 600;
  letter-spacing: 1px;
  color: var(--text);
}

.form-group {
  margin-bottom: 18px;
}

.form-row {
  display: flex;
  gap: 16px;
  justify-content: center;
}

label {
  display: block;
  font-weight: 500;
  margin-bottom: 6px;
  color: var(--text);
}

.input-group {
  display: flex;
  align-items: center;
  gap: 6px;
}

input[type="text"],
input[type="number"] {
  font-size: 1em;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 5px;
  outline: none;
  transition: border 0.2s;
  background: #222;
  color: var(--text);
  width: 100%;
}

input[type="text"]:focus,
input[type="number"]:focus {
  border-color: var(--primary);
}

.icon-btn {
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 5px;
  padding: 7px 10px;
  font-size: 1.1em;
  cursor: pointer;
  transition: background 0.2s;
}

.icon-btn:hover, .icon-btn:focus {
  background: var(--primary-dark);
}

.totp-display {
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 28px 0 10px 0;
  gap: 10px;
}

.totp-code {
  font-size: 2.5em;
  font-family: 'Roboto Mono', 'Consolas', monospace;
  letter-spacing: 0.15em;
  background: #222;
  padding: 10px 24px;
  border-radius: 8px;
  border: 1px solid var(--border);
  min-width: 140px;
  text-align: center;
  user-select: all;
  color: var(--text);
}

.progress-section {
  margin-top: 10px;
}

#countdown {
  text-align: center;
  color: var(--text);
  font-size: 1.1em;
  margin-bottom: 8px;
}

#progress-container {
  width: 100%;
  height: 10px;
  background: #333;
  border-radius: 5px;
  overflow: hidden;
}

#progress {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), #81c784);
  width: 0%;
  border-radius: 5px;
  transition: width 0.5s;
}

/* QR Modal */
#qr-modal {
  display: none;
  position: fixed;
  left: 0; top: 0;
  width: 100vw; height: 100vh;
  background: rgba(0, 0, 0, 0.85);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  display: flex;
}

#qr-modal-content {
  background: #111;
  padding: 28px 20px 20px 20px;
  border-radius: 12px;
  box-shadow: var(--shadow);
  min-width: 320px;
  text-align: center;
  color: var(--text);
}

#qr-reader {
  width: 260px;
  margin: 0 auto 18px auto;
}

.close-btn {
  background: var(--danger);
  color: #fff;
  border: none;
  border-radius: 5px;
  padding: 8px 18px;
  font-size: 1em;
  cursor: pointer;
  margin-top: 10px;
  transition: background 0.2s;
}

.close-btn:hover, .close-btn:focus {
  background: #b71c1c;
}

@media (max-width: 600px) {
  .container {
    max-width: 98vw;
    padding: 16px 4vw;
  }
  #qr-modal-content {
    min-width: 90vw;
    padding: 16px 4vw;
  }
  .totp-code {
    font-size: 2em;
    padding: 8px 8px;
  }
  .form-row {
    flex-direction: column;
    gap: 0;
  }
}