/* ═══════════════════════════════════════════════════════════
   LANGYUN PACK · Prompt Generator · style.css  v1.1
═══════════════════════════════════════════════════════════ */

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

:root {
  --bg:         #0b0b10;
  --surface:    #13131a;
  --surface-2:  #1c1c26;
  --surface-3:  #242432;
  --border:     #2a2a38;
  --border-2:   #353548;

  --amber:      #e8a020;
  --amber-dim:  rgba(232, 160, 32, 0.12);
  --amber-glow: rgba(232, 160, 32, 0.25);

  --teal:       #38c9a0;
  --teal-dim:   rgba(56, 201, 160, 0.12);

  --text:       #eeeef5;
  --text-2:     #9898b0;
  --text-3:     #5a5a72;

  --red-dim:    rgba(220, 60, 60, 0.1);
  --red-text:   #e07070;

  --radius:     8px;
  --radius-lg:  12px;

  --font-ui:    'Syne', 'Noto Sans SC', sans-serif;
  --font-body:  'Noto Sans SC', sans-serif;
  --font-mono:  'Fira Code', 'Courier New', monospace;

  --sidebar-w:  200px;
  --preview-w:  380px;
  --header-h:   56px;
  --transition: 0.18s ease;
}

html { font-size: 14px; scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.6;
  height: 100vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

/* ── HEADER ─────────────────────────────────────────────── */
.app-header {
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  z-index: 100;
}

.header-brand { display: flex; align-items: center; gap: 12px; }

.brand-mark {
  width: 32px; height: 32px;
  background: var(--amber);
  color: #000;
  border-radius: 6px;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-ui);
  font-weight: 800; font-size: 13px;
  letter-spacing: 0.05em; flex-shrink: 0;
}

.brand-text { display: flex; flex-direction: column; line-height: 1.2; }

.brand-name {
  font-family: var(--font-ui); font-weight: 700;
  font-size: 13px; letter-spacing: 0.1em; color: var(--text);
}

.brand-sub { font-size: 11px; color: var(--text-3); letter-spacing: 0.04em; }

.header-actions { display: flex; align-items: center; gap: 8px; }

.version-badge {
  font-family: var(--font-mono); font-size: 10px;
  color: var(--text-3); border: 1px solid var(--border);
  border-radius: 4px; padding: 2px 6px; letter-spacing: 0.05em;
}

/* ── APP BODY ────────────────────────────────────────────── */
.app-body {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr var(--preview-w);
  flex: 1; overflow: hidden;
}

/* ── SIDEBAR ─────────────────────────────────────────────── */
.sidebar {
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex; flex-direction: column;
  overflow-y: auto; padding: 20px 0;
}

.sidebar-section { margin-bottom: 8px; }

.sidebar-label {
  font-size: 10px; font-family: var(--font-ui);
  letter-spacing: 0.14em; color: var(--text-3);
  text-transform: uppercase; padding: 0 16px; margin-bottom: 6px;
}

.sidebar-nav { display: flex; flex-direction: column; }

.sidebar-nav .nav-item {
  display: flex; align-items: center; gap: 10px;
  padding: 9px 16px; cursor: pointer;
  border-left: 2px solid transparent;
  color: var(--text-2); font-size: 13px;
  transition: all var(--transition); user-select: none;
}

.sidebar-nav .nav-item:hover { background: var(--surface-2); color: var(--text); }

.sidebar-nav .nav-item.active {
  border-left-color: var(--amber);
  background: var(--amber-dim); color: var(--amber); font-weight: 500;
}

.nav-item .nav-icon { font-size: 15px; line-height: 1; }

.sidebar-footer {
  margin-top: auto; padding: 16px;
  border-top: 1px solid var(--border);
  font-size: 11px; color: var(--text-3); line-height: 1.6;
}

.sidebar-footer code {
  font-family: var(--font-mono); background: var(--surface-2);
  border: 1px solid var(--border); border-radius: 3px;
  padding: 1px 4px; font-size: 10px; color: var(--amber);
}

/* ── FORM PANEL ──────────────────────────────────────────── */
.form-panel {
  display: flex; flex-direction: column;
  overflow-y: auto; border-right: 1px solid var(--border);
}

.form-header {
  padding: 22px 28px 18px;
  border-bottom: 1px solid var(--border); flex-shrink: 0;
}

.form-header-row {
  display: flex; align-items: flex-start;
  justify-content: space-between; gap: 12px;
}

.form-header h1 {
  font-family: var(--font-ui); font-weight: 700;
  font-size: 20px; margin-bottom: 4px; color: var(--text);
}

.form-header p { font-size: 13px; color: var(--text-2); }

.form-body {
  padding: 20px 28px 32px;
  display: flex; flex-direction: column; gap: 18px;
}

.form-group { display: flex; flex-direction: column; gap: 8px; }

.form-label {
  font-size: 12px; font-family: var(--font-ui);
  font-weight: 600; color: var(--text-2);
  letter-spacing: 0.04em;
  display: flex; align-items: center; gap: 8px;
}

.label-hint { font-weight: 400; color: var(--text-3); font-family: var(--font-body); }

.form-divider {
  display: flex; align-items: center; gap: 12px; margin: 4px 0;
}

.form-divider::before, .form-divider::after {
  content: ''; flex: 1; height: 1px; background: var(--border);
}

.form-divider span {
  font-size: 10px; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--text-3);
  font-family: var(--font-ui); white-space: nowrap;
}

/* ── FORM CONTROLS ───────────────────────────────────────── */
.form-select, .form-input, .form-textarea {
  background: var(--surface-2); border: 1px solid var(--border);
  border-radius: var(--radius); color: var(--text);
  font-family: var(--font-body); font-size: 13px;
  padding: 9px 12px; width: 100%;
  transition: border-color var(--transition);
  appearance: none; -webkit-appearance: none;
}

.form-select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='none' stroke='%235a5a72' stroke-width='2' viewBox='0 0 24 24'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 10px center;
  padding-right: 32px; cursor: pointer;
}

.form-select:focus, .form-input:focus, .form-textarea:focus {
  outline: none; border-color: var(--amber);
}

.form-textarea { resize: vertical; min-height: 72px; line-height: 1.6; }

/* ── PILL GROUP ──────────────────────────────────────────── */
.pill-group { display: flex; flex-wrap: wrap; gap: 6px; }

.pill {
  background: var(--surface-2); border: 1px solid var(--border);
  border-radius: 6px; color: var(--text-2);
  font-size: 12px; font-family: var(--font-body);
  padding: 6px 12px; cursor: pointer;
  transition: all var(--transition); user-select: none; white-space: nowrap;
}

.pill:hover { border-color: var(--border-2); color: var(--text); }

.pill.active {
  background: var(--amber-dim); border-color: var(--amber);
  color: var(--amber); font-weight: 500;
}

/* ── BACKGROUND GRID ─────────────────────────────────────── */
.bg-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; }

.bg-option {
  border: 1.5px solid var(--border); border-radius: var(--radius);
  padding: 8px 10px; cursor: pointer;
  transition: all var(--transition);
  display: flex; flex-direction: column; gap: 4px; user-select: none;
}

.bg-option:hover { border-color: var(--border-2); }
.bg-option.active { border-color: var(--amber); background: var(--amber-dim); }

.bg-swatch {
  width: 100%; height: 28px; border-radius: 4px;
  border: 1px solid rgba(255,255,255,0.06);
}

.bg-name { font-size: 11px; color: var(--text-2); text-align: center; line-height: 1.3; }
.bg-option.active .bg-name { color: var(--amber); }

/* ── FEATURE TOGGLES ─────────────────────────────────────── */
.feature-item {
  display: flex; align-items: flex-start; gap: 10px;
  padding: 10px 14px;
  background: var(--surface-2); border: 1px solid var(--border);
  border-radius: var(--radius); cursor: pointer;
  transition: all var(--transition); user-select: none;
}

.feature-item:hover { border-color: var(--border-2); }
.feature-item.active { border-color: var(--amber); background: var(--amber-dim); }

.feature-check {
  width: 16px; height: 16px; border: 1.5px solid var(--border-2);
  border-radius: 4px; display: flex; align-items: center; justify-content: center;
  flex-shrink: 0; margin-top: 1px; transition: all var(--transition);
}

.feature-item.active .feature-check { background: var(--amber); border-color: var(--amber); }
.feature-check svg { opacity: 0; transition: opacity var(--transition); }
.feature-item.active .feature-check svg { opacity: 1; }

.feature-info { flex: 1; }
.feature-name { font-size: 13px; font-weight: 500; color: var(--text); line-height: 1; margin-bottom: 2px; }
.feature-desc { font-size: 11px; color: var(--text-3); line-height: 1.4; }

/* ── BUTTONS ─────────────────────────────────────────────── */
.btn-generate {
  display: flex; align-items: center; justify-content: center; gap: 10px;
  width: 100%; padding: 14px;
  background: var(--amber); color: #000; border: none;
  border-radius: var(--radius); font-family: var(--font-ui);
  font-weight: 700; font-size: 14px; letter-spacing: 0.06em;
  cursor: pointer; transition: all var(--transition);
  margin-top: 8px; position: relative; overflow: hidden;
}

.btn-generate::before {
  content: ''; position: absolute; inset: 0;
  background: rgba(255,255,255,0); transition: background var(--transition);
}

.btn-generate:hover::before { background: rgba(255,255,255,0.12); }
.btn-generate:active { transform: translateY(1px); }

/* Random button */
.btn-random {
  display: flex; align-items: center; gap: 6px;
  background: var(--teal-dim); border: 1px solid var(--teal);
  border-radius: 6px; color: var(--teal);
  font-family: var(--font-body); font-size: 12px; font-weight: 500;
  padding: 7px 12px; cursor: pointer;
  transition: all var(--transition); white-space: nowrap; flex-shrink: 0;
}

.btn-random:hover { background: rgba(56, 201, 160, 0.2); }
.btn-random:active { transform: translateY(1px); }

.btn-ghost {
  display: flex; align-items: center; gap: 6px;
  background: transparent; border: 1px solid var(--border);
  border-radius: 6px; color: var(--text-2);
  font-family: var(--font-body); font-size: 12px;
  padding: 6px 12px; cursor: pointer; transition: all var(--transition);
}

.btn-ghost:hover { border-color: var(--border-2); color: var(--text); }
.btn-sm { font-size: 11px; padding: 5px 10px; }

.btn-icon {
  background: transparent; border: none; color: var(--text-2);
  cursor: pointer; padding: 4px; border-radius: 4px;
  display: flex; align-items: center; transition: color var(--transition);
}
.btn-icon:hover { color: var(--text); }

/* ── PREVIEW PANEL ───────────────────────────────────────── */
.preview-panel { display: flex; flex-direction: column; overflow: hidden; }

.preview-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 20px; border-bottom: 1px solid var(--border); flex-shrink: 0;
}

.preview-title {
  font-family: var(--font-ui); font-weight: 700;
  font-size: 13px; letter-spacing: 0.06em; color: var(--text);
}

.preview-meta { display: flex; align-items: center; gap: 8px; }

.meta-tag {
  font-size: 10px; font-family: var(--font-ui);
  letter-spacing: 0.08em; padding: 2px 8px;
  border-radius: 4px; border: 1px solid var(--border); color: var(--text-3);
}

.meta-tag.amber { border-color: var(--amber); color: var(--amber); }
.meta-tag.teal  { border-color: var(--teal);  color: var(--teal); }

.preview-body {
  flex: 1; overflow-y: auto; padding: 20px;
  display: flex; flex-direction: column; gap: 16px;
}

/* ── PLACEHOLDER ─────────────────────────────────────────── */
.preview-placeholder {
  flex: 1; display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  gap: 16px; color: var(--text-3); font-size: 13px;
  text-align: center; line-height: 1.7; min-height: 300px;
}

/* ── PROMPT BLOCKS ───────────────────────────────────────── */
.prompt-block {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); overflow: hidden;
}

.prompt-block-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 14px; border-bottom: 1px solid var(--border);
}

.prompt-block-title {
  font-size: 11px; font-family: var(--font-ui);
  letter-spacing: 0.1em; text-transform: uppercase; color: var(--text-3);
}

.prompt-block.negative .prompt-block-header { background: var(--red-dim); }
.prompt-block.negative .prompt-block-title  { color: var(--red-text); }

.prompt-block.en .prompt-block-header { background: rgba(80, 140, 220, 0.08); }
.prompt-block.en .prompt-block-title  { color: #7aabdf; }

.copy-btn {
  display: flex; align-items: center; gap: 5px;
  background: transparent; border: 1px solid var(--border);
  border-radius: 4px; color: var(--text-3);
  font-size: 11px; font-family: var(--font-body);
  padding: 3px 8px; cursor: pointer; transition: all var(--transition);
}

.copy-btn:hover { border-color: var(--amber); color: var(--amber); }
.copy-btn.copied { border-color: #60c060; color: #60c060; }

.prompt-text {
  font-family: var(--font-mono); font-size: 12px; line-height: 1.8;
  color: var(--text); padding: 14px; white-space: pre-wrap; word-break: break-all;
}

.prompt-block.negative .prompt-text { color: var(--red-text); }
.prompt-block.en .prompt-text { color: #9abcdf; }

/* ── INFO CARD ───────────────────────────────────────────── */
.style-info-card {
  display: flex; align-items: center; gap: 12px;
  background: var(--surface-2); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 12px 14px;
}

.style-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--amber); flex-shrink: 0; }
.style-info-text { flex: 1; }
.style-info-label { font-size: 10px; color: var(--text-3); letter-spacing: 0.08em; text-transform: uppercase; font-family: var(--font-ui); }
.style-info-value { font-size: 13px; color: var(--text); font-weight: 500; }

.save-btn {
  display: flex; align-items: center; justify-content: center; gap: 8px;
  width: 100%; padding: 10px;
  background: var(--surface-2); border: 1px solid var(--border);
  border-radius: var(--radius); color: var(--text-2);
  font-family: var(--font-body); font-size: 12px;
  cursor: pointer; transition: all var(--transition);
}

.save-btn:hover { border-color: var(--amber); color: var(--amber); }

/* ── HISTORY DRAWER ──────────────────────────────────────── */
.drawer-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.5);
  z-index: 200; opacity: 0; pointer-events: none; transition: opacity 0.25s;
}

.drawer-overlay.visible { opacity: 1; pointer-events: all; }

.history-drawer {
  position: fixed; top: 0; right: 0; height: 100vh; width: 420px;
  background: var(--surface); border-left: 1px solid var(--border);
  z-index: 201; display: flex; flex-direction: column;
  transform: translateX(100%);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.history-drawer.open { transform: translateX(0); }

.drawer-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 20px; border-bottom: 1px solid var(--border);
  font-family: var(--font-ui); font-weight: 700; font-size: 14px; flex-shrink: 0;
}

.drawer-body { flex: 1; overflow-y: auto; padding: 16px; display: flex; flex-direction: column; gap: 10px; }
.drawer-footer { padding: 14px 20px; border-top: 1px solid var(--border); flex-shrink: 0; }

.history-item {
  background: var(--surface-2); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 12px 14px;
  cursor: pointer; transition: all var(--transition);
}

.history-item:hover { border-color: var(--border-2); }

.history-item-header {
  display: flex; align-items: center; justify-content: space-between; margin-bottom: 6px;
}

.history-item-title { font-size: 12px; font-weight: 600; color: var(--text); }
.history-item-time { font-size: 10px; color: var(--text-3); font-family: var(--font-mono); }

.history-item-preview {
  font-family: var(--font-mono); font-size: 11px; color: var(--text-3);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis; line-height: 1.5;
}

.history-empty {
  display: flex; align-items: center; justify-content: center;
  padding: 60px 20px; color: var(--text-3); font-size: 13px; text-align: center;
}

/* ── TOAST ───────────────────────────────────────────────── */
.toast {
  position: fixed; bottom: 24px; left: 50%;
  transform: translateX(-50%) translateY(80px);
  background: var(--surface-3); border: 1px solid var(--border-2);
  border-radius: 8px; color: var(--text); font-size: 13px;
  padding: 10px 18px; z-index: 999;
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  pointer-events: none; white-space: nowrap;
}

.toast.show { transform: translateX(-50%) translateY(0); }

/* ── SCROLLBAR ───────────────────────────────────────────── */
::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-2); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-3); }

/* ── RESPONSIVE ──────────────────────────────────────────── */
@media (max-width: 1100px) {
  :root { --sidebar-w: 180px; --preview-w: 340px; }
}

@media (max-width: 900px) {
  .app-body { grid-template-columns: 1fr; grid-template-rows: auto 1fr auto; }
  .sidebar { flex-direction: row; overflow-x: auto; padding: 12px; border-right: none; border-bottom: 1px solid var(--border); }
  .sidebar-section { display: flex; align-items: center; gap: 8px; }
  .sidebar-label { display: none; }
  .preview-panel { border-top: 1px solid var(--border); max-height: 50vh; }
  body, .app-body, .form-panel, .preview-panel { overflow: auto; }
}