:root {
  --bg: #f0f2f5;
  --card-bg: #ffffff;
  --text: #1a1a2e;
  --text-secondary: #666;
  --text-muted: #888;
  --border: #dde3f0;
  --border-light: #eee;
  --accent: #005eb8;
  --accent-hover: #004a94;
  --prompt-bg: #f8f9ff;
  --shift-bg: #f8f9ff;
  --success-bg: #f0fff4;
  --success-border: #b2dfdb;
  --success-text: #1b5e20;
  --error-bg: #fff0f0;
  --error-border: #ffcccc;
  --error-text: #c0392b;
  --shadow: rgba(0, 0, 0, 0.08);
}

[data-theme="dark"] {
  --bg: #121212;
  --card-bg: #1e1e1e;
  --text: #e8e8e8;
  --text-secondary: #a0a0a0;
  --text-muted: #707070;
  --border: #2a2a2a;
  --border-light: #2a2a2a;
  --accent: #1db954;
  --accent-hover: #1ed760;
  --prompt-bg: #161916;
  --shift-bg: #161916;
  --success-bg: #0d2818;
  --success-border: #1db954;
  --success-text: #1db954;
  --error-bg: #2a1616;
  --error-border: #e91429;
  --error-text: #e91429;
  --shadow: rgba(0, 0, 0, 0.4);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  min-height: 100vh;
  padding: 20px;
  color: var(--text);
  transition: background 0.3s, color 0.3s;
}

.card {
  background: var(--card-bg);
  border-radius: 16px;
  padding: 24px;
  max-width: 500px;
  margin: 0 auto;
  box-shadow: 0 2px 12px var(--shadow);
  transition: background 0.3s;
}

.header-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 20px;
}

h1 {
  font-size: 1.3rem;
  color: var(--text);
  margin-bottom: 4px;
  display: flex;
  align-items: center;
  gap: 8px;
}

h1 .icon { width: 1.4em; height: 1.4em; }

.subtitle { color: var(--text-secondary); font-size: 0.85rem; }

.theme-toggle {
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 8px;
  transition: background 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
}

.theme-toggle svg { width: 20px; height: 20px; stroke: var(--text); }
.theme-toggle:hover { background: var(--border); }

.lang-toggle {
  display: flex;
  gap: 4px;
  background: var(--bg);
  border-radius: 8px;
  padding: 3px;
  flex-shrink: 0;
}

.lang-btn {
  border: none;
  background: transparent;
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  color: var(--text-secondary);
  transition: all 0.15s;
}

.lang-btn.active { background: var(--card-bg); color: var(--accent); box-shadow: 0 1px 4px var(--shadow); }
.lang-btn:hover:not(.active) { background: var(--border); }

/* Image mode toggle */
.image-mode-toggle {
  display: flex;
  gap: 8px;
  margin-top: 8px;
}

.image-mode-btn {
  flex: 1;
  border: 1.5px solid var(--border);
  background: var(--card-bg);
  border-radius: 10px;
  padding: 10px 8px;
  cursor: pointer;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: all 0.15s;
  text-align: center;
}

.image-mode-btn:hover:not(.active) { background: var(--border); }
.image-mode-btn.active { border-color: var(--accent); color: var(--accent); background: var(--prompt-bg); }

.step {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  margin-bottom: 20px;
}

.step-num {
  background: var(--accent);
  color: white;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 2px;
}

.step-content { flex: 1; }
.step-title { font-weight: 600; font-size: 0.95rem; color: var(--text); margin-bottom: 4px; }
.step-desc { font-size: 0.82rem; color: var(--text-secondary); line-height: 1.4; }

.name-input-wrap { margin-top: 8px; position: relative; }
.name-input-wrap label { font-size: 0.78rem; color: var(--text-muted); margin-bottom: 4px; display: block; }

.name-input {
  width: 100%;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  padding: 9px 12px;
  font-size: 0.9rem;
  outline: none;
  color: var(--text);
  background: var(--card-bg);
  transition: border-color 0.2s;
}

.name-input:hover { border-color: var(--accent); }
.name-input:focus { border-color: var(--accent); }

.prompt-box {
  background: var(--prompt-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
  font-size: 0.78rem;
  color: var(--text);
  line-height: 1.5;
  margin-top: 8px;
  white-space: pre-wrap;
  word-break: break-word;
  max-height: 160px;
  overflow-y: auto;
}

.prompt-box::-webkit-scrollbar { width: 6px; }
.prompt-box::-webkit-scrollbar-track { background: transparent; }
.prompt-box::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
.prompt-box::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

.copy-btn {
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 8px;
  padding: 8px 14px;
  font-size: 0.82rem;
  cursor: pointer;
  margin-top: 8px;
  width: 100%;
  font-weight: 600;
  transition: background 0.2s;
}

.copy-btn:hover { background: var(--accent-hover); }
.copy-btn:active { background: var(--accent-hover); }
.copy-btn.copied { background: #28a745; }

textarea {
  width: 100%;
  height: 160px;
  border: 1.5px solid var(--border);
  border-radius: 10px;
  padding: 12px;
  font-size: 0.82rem;
  font-family: "Courier New", monospace;
  resize: vertical;
  outline: none;
  color: var(--text);
  background: var(--card-bg);
  transition: border-color 0.2s;
  margin-top: 8px;
}

textarea:hover { border-color: var(--accent); }
textarea:focus { border-color: var(--accent); }

.generate-btn {
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 12px;
  padding: 14px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  width: 100%;
  margin-top: 12px;
  transition: background 0.2s, transform 0.1s;
}

.generate-btn:hover { background: var(--accent-hover); }
.generate-btn:active { background: var(--accent-hover); }

.error {
  background: var(--error-bg);
  border: 1px solid var(--error-border);
  color: var(--error-text);
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 0.85rem;
  margin-top: 12px;
  display: none;
}

.success {
  background: var(--success-bg);
  border: 1px solid var(--success-border);
  color: var(--success-text);
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 0.85rem;
  margin-top: 12px;
  display: none;
}

.preview { margin-top: 16px; display: none; }
.preview-title { font-weight: 600; font-size: 0.9rem; color: var(--text); margin-bottom: 8px; }

.shift-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 12px;
  background: var(--shift-bg);
  border-radius: 8px;
  margin-bottom: 6px;
  font-size: 0.85rem;
  transition: background 0.2s;
}

.shift-item:hover { background: var(--border); }
.shift-day { font-weight: 600; color: var(--accent); }
.shift-time { color: var(--text-secondary); }
.shift-hrs { color: var(--text-muted); font-size: 0.78rem; }

.divider { border: none; border-top: 1px solid var(--border-light); margin: 20px 0; }

.footer { text-align: center; margin-top: 20px; color: var(--text-muted); font-size: 0.75rem; }
.footer a { color: var(--accent); text-decoration: none; }

.input-toggle { display: flex; gap: 4px; margin-bottom: 8px; }

.input-toggle-btn {
  border: none;
  background: var(--bg);
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  color: var(--text-secondary);
  transition: all 0.15s;
}

.input-toggle-btn:hover:not(.active) { background: var(--border); }
.input-toggle-btn.active { background: var(--accent); color: white; }

.manual-row { display: flex; gap: 6px; align-items: center; margin-bottom: 8px; }

.manual-input {
  border: 1.5px solid var(--border);
  border-radius: 6px;
  padding: 6px 8px;
  font-size: 0.8rem;
  background: var(--card-bg);
  color: var(--text);
  transition: border-color 0.2s;
}

.manual-input:hover { border-color: var(--accent); }
.manual-input.small { width: 80px; }
.manual-input[type="date"] { flex: 1; }

.add-shift-btn {
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 6px;
  width: 28px;
  height: 28px;
  font-size: 1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
}

.add-shift-btn:hover { background: var(--accent-hover); }
.manual-shifts { margin-bottom: 8px; }

.manual-shift-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 6px 10px;
  background: var(--shift-bg);
  border-radius: 6px;
  margin-bottom: 4px;
  font-size: 0.8rem;
  transition: background 0.2s;
}

.manual-shift-item:hover { background: var(--border); }
.manual-shift-item button { background: none; border: none; color: var(--error-text); cursor: pointer; font-size: 1rem; padding: 0 4px; }

.clear-shifts-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  border-radius: 6px;
  padding: 6px 12px;
  font-size: 0.75rem;
  cursor: pointer;
  width: 100%;
  transition: background 0.2s, border-color 0.2s;
}

.clear-shifts-btn:hover { background: var(--error-bg); border-color: var(--error-text); }

#jsonInput, #manualInput { margin-top: 8px; }

@media (max-width: 480px) {
  body { padding: 12px; }
  .card { padding: 16px; border-radius: 12px; }
  .header-row { flex-direction: column; align-items: center; gap: 10px; text-align: center; }
  h1 { font-size: 1.1rem; justify-content: center; }
  .subtitle { width: 100%; margin-bottom: 4px; }
  .header-row > div:last-child { display: flex; gap: 6px; }
  .theme-toggle, .lang-toggle { margin: 0; }
  .step { gap: 10px; margin-bottom: 16px; }
  .step-num { width: 24px; height: 24px; font-size: 0.7rem; }
  .step-title { font-size: 0.9rem; }
  .step-desc { font-size: 0.78rem; }
  .name-input, textarea, .prompt-box { font-size: 0.85rem; }
  .prompt-box { max-height: 120px; font-size: 0.72rem; }
  .input-toggle { width: 100%; }
  .input-toggle-btn { flex: 1; text-align: center; }
  .manual-row { flex-wrap: wrap; }
  .manual-row .manual-input[type="date"] { width: 100%; flex: none; }
  .manual-row .manual-input.small { flex: 1; min-width: 0; }
  .manual-row span { display: none; }
  .shift-item { flex-wrap: wrap; gap: 4px; }
  .shift-day { width: 100%; }
  .shift-time { font-size: 0.8rem; }
  .shift-hrs { font-size: 0.7rem; }
  .manual-shift-item { flex-wrap: wrap; gap: 4px; }
  .manual-shift-item span:first-child { width: 100%; font-weight: 600; }
  .generate-btn { padding: 12px; font-size: 0.95rem; }
  .footer { font-size: 0.7rem; }
  .image-mode-btn { font-size: 0.75rem; padding: 8px 4px; }
}