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

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.25rem;
  background: #0d1117;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  color: #e6edf3;
  padding: 2.5rem 1.25rem;
}

/* ───── card ───── */
.card {
  width: 100%;
  max-width: 520px;
  background: #161b22;
  border: 1px solid #30363d;
  border-radius: 14px;
  padding: 2.25rem 2.25rem 2rem;
}

.card-header {
  text-align: center;
  margin-bottom: 2rem;
}

.card-header h1 {
  font-size: 1.6rem;
  font-weight: 700;
  color: #e6edf3;
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

/* ───── GitHub repo icon ───── */
.gh-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  color: #484f58;
  transition: color 0.15s;
}

.gh-link:hover {
  color: #e6edf3;
}

.gh-link svg {
  width: 40px;
  height: 40px;
}

.gh-link::after {
  content: 'View on GitHub';
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%) translateY(4px);
  background: #1c2128;
  border: 1px solid #30363d;
  border-radius: 8px;
  color: #c9d1d9;
  font-size: 0.8rem;
  font-weight: 400;
  padding: 0.45rem 0.7rem;
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.18s, transform 0.18s;
  z-index: 20;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.5);
}

.gh-link:hover::after {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.card-header h4 {
  font-size: 0.85rem;
  font-weight: 400;
  color: #6e7681;
  margin-top: 0.25rem;
  letter-spacing: 0.04em;
}

.card-header p {
  font-size: 0.95rem;
  color: #8b949e;
  margin-top: 0.4rem;
}

/* ───── health-check button ───── */
.health-btn {
  display: block;
  text-align: center;
  padding: 0.7rem 1rem;
  background: #238636;
  color: #fff;
  border: none;
  border-radius: 8px;
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
  margin-bottom: 2rem;
  width: 100%;
}

.health-btn:hover {
  background: #2ea043;
}

/* ───── divider ───── */
.divider {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
  color: #484f58;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.07em;
}

.divider::before,
.divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: #21262d;
}

/* ───── fields ───── */
.field {
  margin-bottom: 1.15rem;
}

/* ───── label with built-in tooltip ───── */
.label-tip {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.9rem;
  color: #8b949e;
  margin-bottom: 0.45rem;
  font-weight: 500;
  cursor: default;
  border-bottom: 1px dashed #30363d;
  padding-bottom: 1px;
}

.label-tip::after {
  content: attr(data-tip);
  position: absolute;
  bottom: calc(100% + 10px);
  left: 0;
  background: #1c2128;
  border: 1px solid #30363d;
  border-radius: 10px;
  color: #c9d1d9;
  font-size: 0.85rem;
  font-weight: 400;
  line-height: 1.55;
  padding: 0.7rem 0.9rem;
  width: max-content;
  max-width: 280px;
  text-align: left;
  pointer-events: none;
  opacity: 0;
  transform: translateY(4px);
  transition: opacity 0.18s, transform 0.18s;
  z-index: 20;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.55);
}

.label-tip:hover::after {
  opacity: 1;
  transform: translateY(0);
}

/* required star inside label */
.req {
  color: #e3b341;
  margin-left: 2px;
}

input[type="text"],
input[type="number"] {
  width: 100%;
  background: #0d1117;
  border: 1px solid #30363d;
  border-radius: 8px;
  color: #e6edf3;
  font-size: 1rem;
  padding: 0.65rem 0.85rem;
  outline: none;
  transition: border-color 0.15s;
}

input[type="text"]:focus,
input[type="number"]:focus {
  border-color: #58a6ff;
}

input::placeholder {
  color: #484f58;
}

.row {
  display: flex;
  gap: 0.85rem;
}

.row .field {
  flex: 1;
}

/* ───── toggle row ───── */
.toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: #0d1117;
  border: 1px solid #30363d;
  border-radius: 8px;
  padding: 0.65rem 0.85rem;
  margin-bottom: 1.5rem;
}

.toggle-label-tip {
  position: relative;
  display: inline-flex;
  align-items: center;
  font-size: 0.95rem;
  font-weight: 500;
  color: #e6edf3;
  cursor: default;
  border-bottom: 1px dashed #30363d;
  padding-bottom: 1px;
}

.toggle-label-tip::after {
  content: attr(data-tip);
  position: absolute;
  bottom: calc(100% + 10px);
  left: 0;
  background: #1c2128;
  border: 1px solid #30363d;
  border-radius: 10px;
  color: #c9d1d9;
  font-size: 0.85rem;
  font-weight: 400;
  line-height: 1.55;
  padding: 0.7rem 0.9rem;
  width: max-content;
  max-width: 280px;
  text-align: left;
  pointer-events: none;
  opacity: 0;
  transform: translateY(4px);
  transition: opacity 0.18s, transform 0.18s;
  z-index: 20;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.55);
}

.toggle-label-tip:hover::after {
  opacity: 1;
  transform: translateY(0);
}

/* pill switch */
.switch {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 26px;
  flex-shrink: 0;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider-track {
  position: absolute;
  inset: 0;
  background: #21262d;
  border-radius: 26px;
  cursor: pointer;
  transition: background 0.2s;
}

.slider-track::before {
  content: '';
  position: absolute;
  width: 20px;
  height: 20px;
  left: 3px;
  top: 3px;
  background: #8b949e;
  border-radius: 50%;
  transition: transform 0.2s, background 0.2s;
}

.switch input:checked+.slider-track {
  background: #1a7f37;
}

.switch input:checked+.slider-track::before {
  transform: translateX(18px);
  background: #fff;
}

/* ───── output box ───── */
.output-box {
  background: #0d1117;
  border: 1px solid #30363d;
  border-radius: 8px;
  padding: 0.75rem 0.85rem;
  font-size: 0.88rem;
  color: #79c0ff;
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', monospace;
  word-break: break-all;
  min-height: 3.2rem;
  line-height: 1.55;
  transition: border-color 0.15s;
}

.output-box.empty {
  color: #484f58;
  font-family: inherit;
  font-size: 0.92rem;
  display: flex;
  align-items: center;
}

.output-box.copied {
  border-color: #238636;
}

.readme-hint {
  font-size: 0.82rem;
  color: #484f58;
  margin-top: 0.5rem;
  display: none;
}

.readme-hint.visible {
  display: block;
}

/* ───── buttons ───── */
.actions {
  margin-top: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.btn-row {
  display: flex;
  gap: 0.6rem;
}

button {
  flex: 1;
  padding: 0.7rem 1rem;
  border: none;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, opacity 0.15s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
}

#copyBtn {
  background: #238636;
  color: #fff;
}

#copyBtn:hover {
  background: #2ea043;
}

#copyBtn:disabled {
  opacity: 0.4;
  cursor: default;
  pointer-events: none;
}

#openBtn {
  background: #21262d;
  color: #e6edf3;
  border: 1px solid #30363d;
}

#openBtn:hover {
  background: #30363d;
}

#openBtn:disabled {
  opacity: 0.4;
  cursor: default;
  pointer-events: none;
}

#showBtn {
  background: #1158c2;
  color: #fff;
}

#showBtn:hover {
  background: #1a6fd4;
}

#showBtn:disabled {
  opacity: 0.4;
  cursor: default;
  pointer-events: none;
}

/* ───── preview panel ───── */
#previewPanel {
  display: none;
  width: 100%;
  max-width: 520px;
  background: #161b22;
  border: 1px solid #30363d;
  border-radius: 14px;
  overflow: hidden;
}

#previewPanel.visible {
  display: block;
}

.preview-header {
  padding: 0.75rem 1.15rem;
  border-bottom: 1px solid #21262d;
  font-size: 0.9rem;
  color: #8b949e;
  background: #0d1117;
}

.preview-header strong {
  color: #e6edf3;
}

.preview-body {
  padding: 1.5rem 1.25rem;
  min-height: 90px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow-x: auto;
}

#previewImg {
  max-width: 100%;
  display: none;
}

#previewImg.visible {
  display: block;
}

.preview-spinner {
  width: 22px;
  height: 22px;
  border: 2.5px solid #30363d;
  border-top-color: #58a6ff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  display: none;
}

.preview-spinner.visible {
  display: block;
}

.preview-error {
  font-size: 0.9rem;
  color: #f85149;
  display: none;
  text-align: center;
  line-height: 1.5;
}

.preview-error.visible {
  display: block;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@keyframes flash {

  0%,
  100% {
    opacity: 1;
  }

  50% {
    opacity: 0.6;
  }
}

.flash {
  animation: flash 0.35s ease;
}

/* ───── floating warning box (top-right) ───── */
.warning-float {
  position: fixed;
  top: 1.25rem;
  right: 1.25rem;
  z-index: 100;
  background: #161b22;
  border: 1px solid #634d1a;
  border-radius: 12px;
  padding: 1rem 1.25rem;
  max-width: 340px;
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.5);
}

.warning-float .w-title {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.95rem;
  font-weight: 700;
  color: #e3b341;
  margin-bottom: 0.35rem;
}

.warning-float .w-title .w-emoji {
  font-size: 1.1rem;
}

.warning-float .w-desc {
  font-size: 0.88rem;
  line-height: 1.6;
  color: #8b949e;
}

.warning-float .w-desc a {
  color: #e3b341;
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid #634d1a;
  padding-bottom: 1px;
  transition: color 0.15s, border-color 0.15s;
}

.warning-float .w-desc a:hover {
  color: #f0d060;
  border-color: #f0d060;
}

/* ───── footer ───── */
.footer {
  width: 100%;
  max-width: 520px;
  text-align: center;
  padding: 1.25rem 1.5rem;
  background: #161b22;
  border: 1px solid #30363d;
  border-radius: 14px;
}

.footer-text {
  font-size: 1.1rem;
  color: #8b949e;
  letter-spacing: 0.01em;
}

.footer-text .heart {
  font-size: 1.25rem;
  display: inline-block;
  animation: heartbeat 1.8s ease-in-out infinite;
  vertical-align: middle;
}

.footer-text a {
  color: #3fb950;
  font-weight: 700;
  text-decoration: none;
  display: inline-block;
  transition: color 0.15s, transform 0.25s;
  position: relative;
}

.footer-text a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 2px;
  background: #238636;
  border-radius: 2px;
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 0.25s;
}

.footer-text a:hover {
  color: #56d364;
  transform: translateY(-2px);
}

.footer-text a:hover::after {
  transform: scaleX(1);
}

@keyframes heartbeat {

  0%,
  100% {
    transform: scale(1);
  }

  14% {
    transform: scale(1.25);
  }

  28% {
    transform: scale(1);
  }

  42% {
    transform: scale(1.15);
  }

  56% {
    transform: scale(1);
  }
}