*, *::before, *::after {
  box-sizing: border-box;
}

[hidden] { display: none !important; }

:root {
  --bg:           #0a0a0a;
  --card:         #111108;
  --border:       #3a4a00;
  --text:         #e8ffb0;
  --text-muted:   #7a9a30;
  --accent:       #ccff00;
  --accent-hover: #ddff44;
  --success:      #ccff00;
  --error:        #ff4466;
}

body {
  margin: 0;
  padding: 40px 16px;
  padding-top: 55vh;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  background-color: var(--bg);
  background-image: url('BFTLogoElectricity.png');
  background-size: contain;
  background-position: top center;
  background-repeat: no-repeat;
  background-attachment: fixed;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
               Ubuntu, Cantarell, "Helvetica Neue", Arial, sans-serif;
  font-size: 15px;
  color: var(--text);
  line-height: 1.5;
}

.card {
  width: 100%;
  max-width: 520px;
  background: var(--card);
  border-radius: 12px;
  box-shadow: 0 0 24px rgba(204, 255, 0, 0.25), 0 0 60px rgba(204, 255, 0, 0.08), 0 0 0 1px rgba(204, 255, 0, 0.2);
  overflow: hidden;
}

/* ── Header ── */
header {
  padding: 32px 32px 24px;
  border-bottom: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

header h1 {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  text-align: center;
}

.tagline {
  margin: 0;
  font-size: 0.875rem;
  color: var(--text-muted);
  text-align: center;
}

/* ── Sections ── */
#auth-section,
#control-section {
  padding: 28px 32px 32px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* ── Labels ── */
label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
  display: block;
  margin-bottom: 4px;
}

/* ── Inputs ── */
input[type="password"] {
  width: 100%;
  padding: 10px 14px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-size: 0.9375rem;
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

input[type="password"]:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(204, 255, 0, 0.15);
}

/* ── Buttons ── */
button {
  appearance: none;
  border: none;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: 6px;
  padding: 11px 16px;
  transition: background-color 0.15s ease, opacity 0.15s ease;
}

#verify-btn {
  width: 100%;
  background: var(--accent);
  color: #111;
}

#verify-btn:hover:not(:disabled) {
  background: var(--accent-hover);
}

#verify-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ── Button grid ── */
.button-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.action-btn {
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 8px;
  padding: 18px 12px;
  font-size: 0.9375rem;
  font-weight: 600;
  text-align: center;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.action-btn:hover:not(:disabled) {
  background: var(--accent);
  color: #111;
}

.action-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* ── Messages ── */
.message {
  margin: 0;
  padding: 10px 14px;
  border-radius: 6px;
  font-size: 0.875rem;
  font-weight: 500;
}

.message.success {
  background: rgba(204, 255, 0, 0.08);
  color: var(--success);
}

.message.error {
  background: rgba(239, 68, 68, 0.1);
  color: var(--error);
}

/* ── Output pre ── */
.output-pre {
  margin: 0;
  padding: 12px 14px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.8125rem;
  color: var(--text-muted);
  white-space: pre-wrap;
  word-break: break-all;
  max-height: 240px;
  overflow-y: auto;
}

/* ── Action result ── */
#action-result {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

/* ── Responsive ── */
@media (max-width: 560px) {
  body {
    padding-top: 28vh;
  }

  #auth-section,
  #control-section {
    padding: 20px 20px 24px;
  }

  header {
    padding: 24px 20px 20px;
  }

  .button-grid {
    grid-template-columns: 1fr;
  }
}