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

:root {
  --bg: #ffffff;
  --surface: #f5f5f5;
  --border: #e5e5e5;
  --text: #111111;
  --text2: #666666;
  --active: #111111;
  --active-text: #ffffff;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --mono: "SF Mono", "Fira Code", "Cascadia Code", "JetBrains Mono", Consolas, monospace;
}

.dark {
  --bg: #000000;
  --surface: #111111;
  --border: #222222;
  --text: #eeeeee;
  --text2: #888888;
  --active: #eeeeee;
  --active-text: #111111;
}

html, body {
  height: 100%;
}

body {
  font-family: var(--font);
  -webkit-font-smoothing: antialiased;
}

#app {
  min-height: 100vh;
  display: flex;
  background: var(--bg);
  color: var(--text);
  transition: background 0.35s ease, color 0.35s ease;
}

/* -- Sidebar -- */

.sidebar {
  width: 180px;
  flex-shrink: 0;
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: border-color 0.35s ease;
}

.sidebar-header {
  padding: 20px 16px 16px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--text2);
  border-bottom: 1px solid var(--border);
  user-select: none;
  transition: color 0.35s ease, border-color 0.35s ease;
}

.sidebar-list {
  flex: 1;
  overflow-y: auto;
  padding: 8px 0;
}

.sidebar-item {
  padding: 8px 16px;
  font-size: 13px;
  cursor: pointer;
  user-select: none;
  color: var(--text2);
  border-left: 2px solid transparent;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.sidebar-item:hover {
  color: var(--text);
}

.sidebar-item.active {
  background: var(--active);
  color: var(--active-text);
  border-left-color: var(--active);
}

.sidebar-footer {
  padding: 12px 16px;
  border-top: 1px solid var(--border);
  transition: border-color 0.35s ease;
}

.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  padding: 6px 12px;
  font-size: 12px;
  cursor: pointer;
  color: var(--text2);
  font-family: var(--font);
  width: 100%;
  border-radius: 0;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.theme-toggle:hover {
  background: var(--surface);
  color: var(--text);
}

/* -- Main -- */

.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 24px 32px;
  min-width: 0;
}

.main-header {
  display: flex;
  align-items: center;
  margin-bottom: 8px;
  flex-shrink: 0;
  gap: 10px;
}

.main-title {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.5px;
  color: var(--text2);
  transition: color 0.35s ease;
}

.main-desc {
  font-size: 12px;
  color: var(--text2);
  transition: color 0.35s ease;
}

.wiki-link {
  font-size: 11px;
  color: var(--text2);
  text-decoration: none;
  border: 1px solid var(--border);
  padding: 1px 7px;
  margin-left: auto;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.wiki-link:hover {
  background: var(--text);
  color: var(--bg);
  border-color: var(--text);
}

/* -- Controls -- */

.controls {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  flex-shrink: 0;
  flex-wrap: wrap;
}

.key-input {
  padding: 7px 12px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 13px;
  font-family: var(--mono);
  outline: none;
  width: 160px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, background 0.35s ease, color 0.35s ease;
}

.key-input:focus {
  border-color: var(--text);
  box-shadow: 0 0 0 1px var(--text);
}

.key-input::placeholder {
  color: var(--text2);
  opacity: 0.6;
  font-family: var(--font);
}

.btn {
  padding: 7px 16px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 13px;
  font-family: var(--font);
  cursor: pointer;
  user-select: none;
  transition: background 0.15s ease, color 0.15s ease, opacity 0.15s ease, transform 0.1s ease, border-color 0.15s ease;
}

.btn:hover {
  background: var(--surface);
}

.btn:active {
  background: var(--active);
  color: var(--active-text);
  transform: scale(0.97);
}

.btn-primary {
  background: var(--active);
  color: var(--active-text);
  border-color: var(--active);
}

.btn-primary:hover {
  opacity: 0.85;
}

.btn-primary:active {
  opacity: 1;
  transform: scale(0.97);
}

/* -- Editor -- */

.editor-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  flex: 1;
  min-height: 0;
}

@media (max-width: 720px) {
  .editor-grid {
    grid-template-columns: 1fr;
  }
}

.editor-panel {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--border);
  min-height: 0;
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}

.editor-panel:focus-within {
  border-color: var(--text);
  box-shadow: 0 0 0 1px var(--text);
}

.editor-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px 6px;
  font-size: 11px;
  font-weight: 600;
  color: var(--text2);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  user-select: none;
  transition: color 0.35s ease;
}

.editor-label .count {
  font-weight: 400;
  font-size: 10px;
  opacity: 0.5;
}

.editor-panel textarea {
  flex: 1;
  width: 100%;
  padding: 4px 14px 14px;
  border: none;
  background: transparent;
  color: var(--text);
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.8;
  resize: none;
  outline: none;
  min-height: 200px;
  tab-size: 2;
  transition: color 0.35s ease;
}

.editor-panel textarea::placeholder {
  color: var(--text2);
  opacity: 0.35;
}

.editor-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 14px 10px;
  border-top: 1px solid var(--border);
  transition: border-color 0.35s ease;
}

.editor-footer .info {
  font-size: 11px;
  color: var(--text2);
  opacity: 0.5;
}

.copy-btn {
  padding: 4px 10px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text2);
  font-size: 11px;
  font-family: var(--font);
  cursor: pointer;
  user-select: none;
  transition: background 0.15s ease, color 0.15s ease, transform 0.12s ease, border-color 0.15s ease;
}

.copy-btn:hover {
  background: var(--surface);
  color: var(--text);
}

.copy-btn:active {
  transform: scale(0.95);
}

.copy-btn.copied {
  background: var(--active);
  color: var(--active-text);
  border-color: var(--active);
  animation: copyPulse 0.4s ease;
}

@keyframes copyPulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.08); }
  100% { transform: scale(1); }
}

/* -- Output fade on change -- */

.output-area {
  animation: outputFade 0.2s ease;
}

@keyframes outputFade {
  from { opacity: 0.4; }
  to { opacity: 1; }
}

/* -- Toast -- */

.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--active);
  color: var(--active-text);
  padding: 8px 20px;
  font-size: 12px;
  border: 1px solid var(--border);
  z-index: 100;
  animation: toastIn 0.25s ease;
  pointer-events: none;
  user-select: none;
  transition: background 0.35s ease, color 0.35s ease;
}

@keyframes toastIn {
  from {
    opacity: 0;
    transform: translateX(-50%) translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
  }
}

/* -- Mobile -- */

@media (max-width: 640px) {
  #app {
    flex-direction: column;
  }

  .sidebar {
    width: 100%;
    border-right: none;
    border-bottom: 1px solid var(--border);
    flex-direction: row;
    align-items: stretch;
    overflow: visible;
    max-height: none;
  }

  .sidebar-header {
    padding: 10px 12px;
    font-size: 11px;
    border-bottom: none;
    border-right: 1px solid var(--border);
    display: flex;
    align-items: center;
    white-space: nowrap;
  }

  .sidebar-list {
    display: flex;
    flex-direction: row;
    overflow-x: auto;
    overflow-y: hidden;
    padding: 0;
    flex: 1;
    -webkit-overflow-scrolling: touch;
  }

  .sidebar-list::-webkit-scrollbar {
    height: 2px;
  }

  .sidebar-item {
    padding: 10px 12px;
    font-size: 12px;
    white-space: nowrap;
    border-left: none;
    border-bottom: 2px solid transparent;
    flex-shrink: 0;
  }

  .sidebar-item.active {
    border-left-color: transparent;
    border-bottom-color: var(--active);
  }

  .sidebar-footer {
    border-top: none;
    border-left: 1px solid var(--border);
    display: flex;
    align-items: center;
    padding: 0;
  }

  .sidebar-footer .theme-toggle {
    width: auto;
    height: 100%;
    padding: 10px 12px;
    font-size: 11px;
    border: none;
    white-space: nowrap;
  }

  .main {
    padding: 12px;
  }

  .main-header {
    flex-wrap: wrap;
    gap: 4px;
  }

  .main-title {
    font-size: 12px;
  }

  .main-desc {
    font-size: 11px;
    width: 100%;
    order: 1;
  }

  .controls {
    gap: 6px;
    margin-bottom: 12px;
  }

  .key-input {
    width: 100%;
    order: 10;
    font-size: 13px;
  }

  .btn {
    padding: 8px 14px;
    font-size: 13px;
    flex: 1;
    text-align: center;
    min-width: 0;
  }

  .editor-grid {
    gap: 10px;
  }

  .editor-panel textarea {
    min-height: 130px;
    font-size: 13px;
    padding: 4px 12px 12px;
  }

  .editor-label {
    padding: 8px 12px 4px;
    font-size: 10px;
  }

  .editor-footer {
    padding: 6px 12px 8px;
  }

  .toast {
    font-size: 11px;
    padding: 6px 14px;
    bottom: 16px;
  }
}

@media (max-width: 640px) and (orientation: landscape) {
  .editor-panel textarea {
    min-height: 100px;
  }

  .sidebar-item {
    padding: 8px 10px;
    font-size: 11px;
  }
}

/* -- Scrollbar -- */

.sidebar-list::-webkit-scrollbar {
  width: 4px;
}

.sidebar-list::-webkit-scrollbar-track {
  background: transparent;
}

.sidebar-list::-webkit-scrollbar-thumb {
  background: var(--border);
  transition: background 0.35s ease;
}