body {
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
  font-size: 12px;
}

/* ── Tab bar ──────────────────────────────────────────────────── */

.tab-bar {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--sz-color-button-shadow, #808080);
  padding: 4px 8px 0;
  flex-shrink: 0;
}

.tab {
  padding: 4px 14px;
  border: 1px solid var(--sz-color-button-shadow, #808080);
  border-bottom: none;
  border-radius: 4px 4px 0 0;
  background: var(--sz-color-button-face, #d4d0c8);
  color: var(--sz-color-button-text, #000);
  cursor: pointer;
  font: inherit;
  margin-bottom: -1px;
  position: relative;
}

.tab:hover {
  background: var(--sz-color-button-highlight, #fff);
}

.tab.active {
  background: var(--sz-color-window, #fff);
  border-bottom: 1px solid var(--sz-color-window, #fff);
  font-weight: bold;
  z-index: 1;
}

/* ── Tab panels ───────────────────────────────────────────────── */

.tab-panel {
  display: none;
  flex: 1;
  overflow-y: auto;
  padding: 12px 16px;
}

.tab-panel.active {
  display: block;
}

/* ── General tab ──────────────────────────────────────────────── */

.header-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 10px;
}

.logo {
  flex-shrink: 0;
  animation: logo-pulse 3s ease-in-out infinite;
}

@keyframes logo-pulse {
  0%, 100% { filter: drop-shadow(0 0 2px rgba(59, 130, 246, 0.3)); }
  50%      { filter: drop-shadow(0 0 8px rgba(59, 130, 246, 0.7)); }
}

.header-text h2 {
  margin: 0 0 2px;
  font-size: 16px;
}

.tagline {
  margin: 0;
  opacity: 0.7;
  font-style: italic;
}

.data-notice {
  margin: 10px 0;
  padding: 8px 10px;
  border: 1px solid var(--sz-color-info-text, #000);
  border-radius: 3px;
  background: var(--sz-color-info-window, #ffffe1);
  color: var(--sz-color-info-text, #000);
  font-size: 11px;
  line-height: 1.45;
}

.data-notice strong {
  display: block;
  margin-bottom: 3px;
}

.data-notice em {
  font-weight: bold;
  font-style: normal;
  color: #c00;
}

.divider {
  margin: 10px 0 4px;
  border: none;
  border-top: 1px solid var(--sz-color-button-shadow, #808080);
}

.version {
  font-size: 11px;
  opacity: 0.7;
  text-align: center;
}

#link-website {
  color: var(--sz-color-hot-tracking, #0066cc);
}

/* ── System tab ───────────────────────────────────────────────── */

.sys-info {
  width: 100%;
  border-collapse: collapse;
  font-size: 12px;
}

.sys-info th {
  text-align: left;
  padding: 4px 8px 4px 0;
  white-space: nowrap;
  font-weight: normal;
  opacity: 0.7;
  width: 40%;
}

.sys-info td {
  text-align: left;
  padding: 4px 0;
  word-break: break-word;
}

.copy-btn {
  margin-top: 10px;
  padding: 4px 12px;
  border: 1px solid var(--sz-color-button-shadow, #808080);
  border-radius: 2px;
  background: var(--sz-color-button-face, #d4d0c8);
  color: var(--sz-color-button-text, #000);
  cursor: pointer;
  font: inherit;
  font-size: 11px;
}

.copy-btn:hover {
  background: var(--sz-color-button-highlight, #fff);
}

.copy-btn:active {
  background: var(--sz-color-button-shadow, #808080);
}

/* ── Credits tab ──────────────────────────────────────────────── */

.credits-scroll {
  font-size: 12px;
  line-height: 1.5;
}

.credits-scroll h3 {
  margin: 10px 0 4px;
  font-size: 13px;
  border-bottom: 1px solid var(--sz-color-button-shadow, #808080);
  padding-bottom: 2px;
}

.credits-scroll h3:first-child {
  margin-top: 0;
}

.credits-scroll p {
  margin: 4px 0;
}

.license-notice,
.donate-notice {
  margin: 8px 0;
  padding: 8px 10px;
  border-radius: 3px;
  font-size: 11px;
  line-height: 1.45;
}

.license-notice {
  border: 1px solid var(--sz-color-button-shadow, #808080);
  background: var(--sz-color-button-face, #d4d0c8);
  color: var(--sz-color-button-text, #000);
}

.donate-notice {
  border: 1px solid var(--sz-color-info-text, #000);
  background: var(--sz-color-info-window, #ffffe1);
  color: var(--sz-color-info-text, #000);
}

.license-notice strong,
.donate-notice strong {
  display: block;
  margin-bottom: 3px;
}

.credits-link {
  color: var(--sz-color-hot-tracking, #0066cc);
}

.donate-heart {
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.15s ease;
  display: inline-block;
}

.donate-heart:hover {
  transform: scale(1.3);
  filter: brightness(1.2);
}

/* ── What's New tab ───────────────────────────────────────────── */

.whatsnew-scroll {
  font-size: 12px;
  line-height: 1.5;
}

.changelog-loading {
  opacity: 0.6;
  font-style: italic;
}

.changelog-version {
  margin: 12px 0 2px;
  font-size: 13px;
  font-weight: bold;
  border-bottom: 1px solid var(--sz-color-button-shadow, #808080);
  padding-bottom: 2px;
}

.changelog-version:first-child {
  margin-top: 0;
}

.changelog-date {
  font-size: 10px;
  opacity: 0.6;
  margin-bottom: 4px;
}

.changelog-entry {
  padding: 1px 0 1px 4px;
  font-size: 11px;
  border-left: 3px solid transparent;
  margin: 1px 0;
}

.changelog-added {
  border-left-color: #2e7d32;
  color: #1b5e20;
}

.changelog-fixed {
  border-left-color: #1565c0;
  color: #0d47a1;
}

.changelog-changed {
  border-left-color: #f57f17;
  color: #e65100;
}

.changelog-removed {
  border-left-color: #c62828;
  color: #b71c1c;
}

.changelog-issue {
  border-left-color: #ff8f00;
  color: #e65100;
  font-style: italic;
}

/* ── OK button bar ────────────────────────────────────────────── */

.button-bar {
  display: flex;
  justify-content: center;
  padding: 8px 16px 10px;
  border-top: 1px solid var(--sz-color-button-shadow, #808080);
  flex-shrink: 0;
}

.ok-btn {
  min-width: 80px;
  padding: 4px 16px;
  border: 2px outset var(--sz-color-button-face, #d4d0c8);
  border-radius: 2px;
  background: var(--sz-color-button-face, #d4d0c8);
  color: var(--sz-color-button-text, #000);
  font: inherit;
  font-weight: bold;
  cursor: pointer;
}

.ok-btn:hover {
  background: var(--sz-color-button-highlight, #fff);
}

.ok-btn:active {
  border-style: inset;
}

.ok-btn:focus-visible {
  outline: 1px dotted var(--sz-color-button-text, #000);
  outline-offset: -4px;
}