/* ── Reset & Variables ──────────────────────────────────────── */

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

/* ── Theme: 深邃暗（默认）─ */
:root,
[data-theme="dark"] {
  --bg:       #0f0f13;
  --surface:  #18181f;
  --surface2: #1f1f28;
  --border:   rgba(255,255,255,0.07);
  --accent:   #7c6af5;
  --accent2:  #a89bfa;
  --text:     #e4e4ea;
  --text2:    #8a8a9a;
  --text3:    #55555f;
  --danger:   #f56c6c;
  --radius:   12px;
  --radius2:  8px;
  --ease:     cubic-bezier(0.16, 1, 0.3, 1);
}

/* ── Theme: 纯净白 ─ */
[data-theme="light"] {
  --bg:       #f5f5f7;
  --surface:  #ffffff;
  --surface2: #f0f0f4;
  --border:   rgba(0,0,0,0.08);
  --accent:   #6c5ce7;
  --accent2:  #5a4bd4;
  --text:     #1a1a2e;
  --text2:    #555570;
  --text3:    #9999aa;
  --danger:   #e74c3c;
  --radius:   12px;
  --radius2:  8px;
  --ease:     cubic-bezier(0.16, 1, 0.3, 1);
}

/* ── Theme: 赛博朋克 ─ */
[data-theme="cyber"] {
  --bg:       #0a0a14;
  --surface:  #10102a;
  --surface2: #181840;
  --border:   rgba(0,255,255,0.12);
  --accent:   #00f0ff;
  --accent2:  #ff00aa;
  --text:     #e0f8ff;
  --text2:    #7aaccc;
  --text3:    #3a5a7a;
  --danger:   #ff2d55;
  --radius:   12px;
  --radius2:  8px;
  --ease:     cubic-bezier(0.16, 1, 0.3, 1);
}

/* ── Theme: 莫兰迪 ─ */
[data-theme="morandi"] {
  --bg:       #e8e4df;
  --surface:  #f2ede8;
  --surface2: #ddd8d0;
  --border:   rgba(0,0,0,0.08);
  --accent:   #9b8fa0;
  --accent2:  #7a6f80;
  --text:     #4a4540;
  --text2:    #7a7068;
  --text3:    #a09890;
  --danger:   #c09080;
  --radius:   12px;
  --radius2:  8px;
  --ease:     cubic-bezier(0.16, 1, 0.3, 1);
}

/* ── Theme: 护眼绿 ─ */
[data-theme="green"] {
  --bg:       #1a2416;
  --surface:  #222e1e;
  --surface2: #2a3a24;
  --border:   rgba(120,200,80,0.12);
  --accent:   #78c850;
  --accent2:  #9fd878;
  --text:     #d4e8c0;
  --text2:    #90b888;
  --text3:    #5a7848;
  --danger:   #e87070;
  --radius:   12px;
  --radius2:  8px;
  --ease:     cubic-bezier(0.16, 1, 0.3, 1);
}

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  transition: background 0.3s, color 0.3s;
}

#app { transition: background 0.3s; }

button { cursor: pointer; font-family: inherit; }
a { color: var(--accent2); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Layout ──────────────────────────────────────────────────── */

#app {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 24px 80px;
  min-height: 100vh;
}

/* ── Header ──────────────────────────────────────────────────── */

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px 0 24px;
}

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

/* ── Theme Switcher ─────────────────────────────────────────── */

.theme-switcher {
  display: flex;
  align-items: center;
  gap: 2px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 3px 6px;
}

.theme-btn {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: none;
  background: transparent;
  color: var(--text3);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, transform 0.15s;
}

.theme-btn:hover {
  color: var(--text);
  background: var(--surface2);
  transform: scale(1.1);
}

.theme-btn.active {
  background: var(--accent);
  color: #fff;
}

.theme-btn.active svg { stroke: #fff; fill: #fff; }

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.3px;
}
.logo svg { color: var(--accent2); }

/* ── Alert ───────────────────────────────────────────────────── */

.alert-banner {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  background: rgba(124,106,245,0.1);
  border: 1px solid rgba(124,106,245,0.25);
  border-radius: var(--radius2);
  color: var(--text2);
  font-size: 13px;
  margin-bottom: 20px;
  animation: fadeSlideIn 0.4s var(--ease);
}
.alert-banner svg { color: var(--accent2); flex-shrink: 0; }

.link-btn {
  background: none;
  border: none;
  color: var(--accent2);
  font-size: inherit;
  padding: 0;
  text-decoration: underline;
  cursor: pointer;
}

/* ── Model Tabs ──────────────────────────────────────────────── */

.model-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 20px;
}

.model-tab {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius2);
  padding: 10px 14px;
  color: var(--text2);
  transition: all 0.2s;
}

.model-tab:hover {
  border-color: rgba(124,106,245,0.3);
  color: var(--text);
}

.model-tab.active {
  background: rgba(124,106,245,0.12);
  border-color: rgba(124,106,245,0.5);
  color: var(--text);
}

.tab-name {
  font-size: 13px;
  font-weight: 600;
  font-family: 'Courier New', monospace;
}

.tab-desc {
  font-size: 11px;
  color: var(--text3);
}

.model-tab.active .tab-desc { color: var(--accent2); }

/* ── Prompt Tags ─────────────────────────────────────────────── */

.prompt-tags {
  margin-bottom: 12px;
}

.tags-label {
  display: block;
  font-size: 12px;
  font-weight: 500;
  color: var(--text3);
  margin-bottom: 8px;
}

.tags-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tag-pill {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  color: var(--text2);
  font-size: 11px;
  padding: 3px 10px;
  cursor: pointer;
  transition: all 0.15s;
  font-family: inherit;
}

.tag-pill:hover {
  background: rgba(124,106,245,0.15);
  border-color: rgba(124,106,245,0.4);
  color: var(--accent2);
}

.tag-pill:active {
  transform: scale(0.96);
}

/* ── Prompt ──────────────────────────────────────────────────── */

.prompt-row {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color 0.2s;
  margin-bottom: 16px;
}
.prompt-row:focus-within { border-color: rgba(124,106,245,0.4); }

textarea {
  width: 100%;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text);
  font-family: inherit;
  font-size: 15px;
  line-height: 1.6;
  padding: 14px 16px 8px;
  resize: vertical;
  border-radius: var(--radius);
  min-height: 100px;
}
textarea::placeholder { color: var(--text3); }

.prompt-footer {
  display: flex;
  justify-content: flex-end;
  padding: 0 14px 10px;
}
.char-count { font-size: 11px; color: var(--text3); font-variant-numeric: tabular-nums; }

/* ── Options Grid ────────────────────────────────────────────── */

.options-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 16px;
}

.options-col {
  display: flex;
  flex-direction: column;
  gap: 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
}

.opt-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.opt-label {
  font-size: 12px;
  font-weight: 500;
  color: var(--text2);
}

.opt-hint {
  font-weight: 400;
  color: var(--text3);
  font-size: 11px;
}

.opt-note {
  font-size: 11px;
  color: var(--text3);
  font-style: italic;
}

/* ── Select ─────────────────────────────────────────────────── */

select {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius2);
  color: var(--text);
  font-family: inherit;
  font-size: 14px;
  padding: 8px 30px 8px 10px;
  outline: none;
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%238a8a9a' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 8px center;
  transition: border-color 0.2s;
  width: 100%;
}
select:focus { border-color: rgba(124,106,245,0.4); }

/* ── Number / Text inputs ────────────────────────────────────── */

input[type="number"],
input[type="text"] {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius2);
  color: var(--text);
  font-family: inherit;
  font-size: 14px;
  padding: 8px 10px;
  outline: none;
  width: 100%;
  transition: border-color 0.2s;
}
input:focus { border-color: rgba(124,106,245,0.4); }
input::placeholder { color: var(--text3); }

/* Hide number spinners */
input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button { -webkit-appearance: none; }
input[type="number"] { -moz-appearance: textfield; }

/* ── Stepper ─────────────────────────────────────────────────── */

.stepper {
  display: flex;
  align-items: center;
  gap: 0;
  width: 100%;
}

.stepper-btn {
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text2);
  width: 36px;
  height: 36px;
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s, color 0.15s;
  flex-shrink: 0;
  border-radius: var(--radius2);
}
.stepper-btn:first-child { border-radius: var(--radius2) 0 0 var(--radius2); }
.stepper-btn:last-child  { border-radius: 0 var(--radius2) var(--radius2) 0; }
.stepper-btn:hover { background: var(--accent); color: #fff; border-color: var(--accent); }

.stepper input {
  border-radius: 0;
  border-left: none;
  border-right: none;
  text-align: center;
  width: 52px;
  flex-shrink: 0;
  -moz-appearance: textfield;
}

/* ── Dimension row ───────────────────────────────────────────── */

.dim-row {
  display: flex;
  align-items: center;
  gap: 8px;
}
.dim-row input { flex: 1; }
.dim-x { color: var(--text3); font-size: 14px; flex-shrink: 0; }

/* ── Weight slider ───────────────────────────────────────────── */

.weight-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  background: var(--surface2);
  border-radius: 2px;
  outline: none;
  border: none;
  padding: 0;
  cursor: pointer;
}
.weight-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  transition: transform 0.15s;
}
.weight-slider::-webkit-slider-thumb:hover { transform: scale(1.2); }

/* ── Toggle switches ─────────────────────────────────────────── */

.toggle-group {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.toggle-row {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
}

.toggle-row input { display: none; }

.toggle-track {
  width: 36px;
  height: 20px;
  background: var(--surface2);
  border-radius: 10px;
  position: relative;
  transition: background 0.2s;
  flex-shrink: 0;
  border: 1px solid var(--border);
}

.toggle-thumb {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--text3);
  transition: transform 0.2s, background 0.2s;
}

.toggle-row input:checked + .toggle-track {
  background: rgba(124,106,245,0.3);
  border-color: rgba(124,106,245,0.5);
}
.toggle-row input:checked + .toggle-track .toggle-thumb {
  transform: translateX(16px);
  background: var(--accent);
}

.toggle-label { font-size: 13px; color: var(--text2); }

/* ── Generate Button ─────────────────────────────────────────── */

.generate-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius2);
  padding: 12px 24px;
  font-size: 15px;
  font-weight: 600;
  width: 100%;
  height: 48px;
  transition: background 0.2s, transform 0.15s var(--ease), opacity 0.2s;
  margin-bottom: 16px;
}
.generate-btn:hover:not(:disabled) { background: var(--accent2); transform: translateY(-1px); }
.generate-btn:active:not(:disabled) { transform: translateY(0); }
.generate-btn:disabled { opacity: 0.65; cursor: not-allowed; }

.generate-btn .spinner { display: none; animation: spin 0.9s linear infinite; }
.generate-btn.loading .btn-icon,
.generate-btn.loading .btn-text { display: none; }
.generate-btn.loading .spinner { display: inline; }

/* ── Error ────────────────────────────────────────────────────── */

.error-msg {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  padding: 10px 14px;
  background: rgba(245,108,108,0.1);
  border: 1px solid rgba(245,108,108,0.2);
  border-radius: var(--radius2);
  color: var(--danger);
  font-size: 13px;
  animation: fadeSlideIn 0.3s var(--ease);
}

/* ── Result Meta ──────────────────────────────────────────────── */

.result-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  padding: 10px 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius2);
  font-size: 12px;
  color: var(--text2);
  margin-bottom: 14px;
}

.result-meta code {
  font-family: 'Courier New', monospace;
  color: var(--accent2);
  font-size: 11px;
}

/* ── Image Grid ──────────────────────────────────────────────── */

.image-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}

.image-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  animation: fadeSlideIn 0.4s var(--ease);
}

.image-card img {
  display: block;
  width: 100%;
  height: auto;
  min-height: 180px;
  object-fit: cover;
  background: var(--surface2);
}

.image-actions {
  display: flex;
  gap: 8px;
  padding: 10px;
  border-top: 1px solid var(--border);
}

.action-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius2);
  color: var(--text2);
  font-size: 12px;
  padding: 6px 10px;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
  cursor: pointer;
  font-family: inherit;
}
.action-btn:hover {
  background: rgba(124,106,245,0.12);
  color: var(--text);
  border-color: rgba(124,106,245,0.3);
}

/* ── Icon button ─────────────────────────────────────────────── */

.icon-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  color: var(--text2);
  border-radius: var(--radius2);
  width: 36px;
  height: 36px;
  transition: background 0.15s, color 0.15s;
  flex-shrink: 0;
}
.icon-btn:hover { background: var(--surface); color: var(--text); }

/* ── Modal ───────────────────────────────────────────────────── */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s;
  z-index: 100;
}
.modal-overlay.open { opacity: 1; pointer-events: all; }

.modal {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  width: 100%;
  max-width: 420px;
  transform: translateY(12px) scale(0.97);
  transition: transform 0.3s var(--ease);
}
.modal-overlay.open .modal { transform: translateY(0) scale(1); }

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 20px 0;
}
.modal-header h2 { font-size: 16px; font-weight: 600; }

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

.field { display: flex; flex-direction: column; gap: 7px; }
.field label { font-size: 13px; font-weight: 500; color: var(--text2); }

.input-row { display: flex; gap: 8px; }
.input-row input { flex: 1; }

.field-hint { font-size: 11px; color: var(--text3); }

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  padding: 0 20px 18px;
}

.btn-secondary {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius2);
  color: var(--text2);
  font-family: inherit;
  font-size: 14px;
  padding: 8px 18px;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}
.btn-secondary:hover { background: rgba(255,255,255,0.06); color: var(--text); }

.btn-primary {
  background: var(--accent);
  border: none;
  border-radius: var(--radius2);
  color: #fff;
  font-family: inherit;
  font-size: 14px;
  font-weight: 600;
  padding: 8px 18px;
  cursor: pointer;
  transition: background 0.15s;
}
.btn-primary:hover { background: var(--accent2); }

/* ── Animations ──────────────────────────────────────────────── */

@keyframes fadeSlideIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

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

/* ── Responsive ──────────────────────────────────────────────── */

@media (max-width: 600px) {
  #app { padding: 0 16px 60px; }
  .options-grid { grid-template-columns: 1fr; }
  .image-grid { grid-template-columns: 1fr; }
}