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

:root {
  --bg: #ffffff;
  --bg-panel: #fafbfc;
  --bg-card: #ffffff;
  --bg-input: #f5f6f8;
  --bg-hover: #f0f1f4;
  --bg-active: #eef0f4;
  --border: #e5e7ec;
  --border-light: #eef0f4;
  --border-focus: #111111;
  --text: #111111;
  --text-secondary: #555c6b;
  --text-muted: #9ca3b0;
  --text-placeholder: #b0b6c3;
  --accent: #111111;
  --accent-hover: #333333;
  --accent-soft: rgba(17,17,17,0.06);
  --danger: #dc2626;
  --danger-soft: rgba(220,38,38,0.08);
  --success: #16a34a;
  --blue: #2563eb;
  --purple: #7c3aed;
  --radius: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow: 0 2px 8px rgba(0,0,0,0.06);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.08);
  --shadow-xl: 0 20px 60px rgba(0,0,0,0.12);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --transition: 0.15s ease;
}

html, body { height: 100%; font-family: var(--font); font-size: 14px; line-height: 1.5; color: var(--text); background: var(--bg); -webkit-font-smoothing: antialiased; overflow: hidden; }
#app { display: flex; flex-direction: column; height: 100vh; }

::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ===== Topbar ===== */
.topbar { display: flex; align-items: center; justify-content: space-between; height: 60px; padding: 0 24px; background: var(--bg); border-bottom: 1px solid var(--border); flex-shrink: 0; z-index: 100; }
.topbar-left { display: flex; align-items: center; }
.logo { display: flex; align-items: center; gap: 12px; }
.logo-mark { flex-shrink: 0; }
.logo-text-group { display: flex; align-items: baseline; gap: 8px; }
.logo-text { font-size: 17px; font-weight: 700; letter-spacing: -0.03em; color: var(--text); }
.logo-badge { font-size: 9px; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; color: var(--text-muted); background: var(--bg-input); padding: 2px 6px; border-radius: 4px; }

.topbar-nav { display: flex; gap: 1px; background: var(--bg-input); padding: 3px; border-radius: var(--radius); }
.nav-btn { display: flex; align-items: center; gap: 6px; padding: 7px 16px; border: none; border-radius: 6px; background: transparent; color: var(--text-secondary); font-size: 13px; font-weight: 500; font-family: var(--font); cursor: pointer; transition: var(--transition); }
.nav-btn:hover { color: var(--text); background: var(--bg-hover); }
.nav-btn.active { color: var(--text); background: var(--bg-card); box-shadow: var(--shadow-sm); }

.topbar-right { display: flex; align-items: center; gap: 12px; }
.kbd-hint { font-size: 11px; color: var(--text-muted); background: var(--bg-input); padding: 4px 8px; border-radius: 5px; font-weight: 500; }
.settings-btn { display: flex; align-items: center; justify-content: center; width: 38px; height: 38px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg); color: var(--text-secondary); cursor: pointer; transition: var(--transition); }
.settings-btn:hover { color: var(--text); border-color: var(--text-muted); background: var(--bg-hover); }

/* ===== Main ===== */
.main-content { flex: 1; overflow: hidden; position: relative; }
.tab-panel { display: none; height: 100%; }
.tab-panel.active { display: flex; flex-direction: column; }

/* ===== Layouts ===== */
.generate-layout, .edit-layout { display: flex; height: 100%; }

.control-panel { width: 360px; min-width: 360px; height: 100%; padding: 24px; padding-bottom: 32px; background: var(--bg-panel); border-right: 1px solid var(--border); overflow-y: auto; overflow-x: hidden; display: flex; flex-direction: column; gap: 20px; }

.panel-brand { display: flex; align-items: center; gap: 8px; font-size: 13px; font-weight: 600; color: var(--text-secondary); padding-bottom: 4px; border-bottom: 1px solid var(--border-light); padding-bottom: 16px; }
.panel-brand-icon { font-size: 16px; }

.panel-section { display: flex; flex-direction: column; gap: 8px; }
.field-label { font-size: 12px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-secondary); }
.label-opt { font-weight: 400; text-transform: none; letter-spacing: 0; color: var(--text-muted); font-size: 11px; }

/* ===== Prompt ===== */
.prompt-wrap { position: relative; }
.prompt-input { width: 100%; padding: 14px 16px; background: var(--bg); border: 1.5px solid var(--border); border-radius: var(--radius-lg); color: var(--text); font-family: var(--font); font-size: 14px; line-height: 1.65; resize: vertical; transition: border-color var(--transition), box-shadow var(--transition); }
.prompt-input:focus { outline: none; border-color: var(--border-focus); box-shadow: 0 0 0 3px var(--accent-soft); }
.prompt-input::placeholder { color: var(--text-placeholder); }
.prompt-footer { display: flex; justify-content: space-between; align-items: center; margin-top: 6px; }
.char-count { font-size: 11px; color: var(--text-muted); font-weight: 500; }
.text-btn { display: inline-flex; align-items: center; gap: 4px; background: none; border: none; color: var(--text-muted); font-size: 12px; font-family: var(--font); cursor: pointer; padding: 3px 6px; border-radius: 4px; transition: var(--transition); font-weight: 500; }
.text-btn:hover { color: var(--text-secondary); background: var(--bg-hover); }
.text-btn.danger:hover { color: var(--danger); background: var(--danger-soft); }

/* ===== Size Grid ===== */
.size-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px; }
.size-btn { display: flex; align-items: center; gap: 10px; padding: 10px 12px; background: var(--bg); border: 1.5px solid var(--border); border-radius: var(--radius); color: var(--text-secondary); font-family: var(--font); cursor: pointer; transition: var(--transition); text-align: left; overflow: hidden; min-width: 0; }
.size-btn:hover { border-color: var(--text-muted); color: var(--text); }
.size-btn.active { border-color: var(--accent); background: var(--accent-soft); color: var(--text); }
.size-icon-wrap { flex-shrink: 0; width: 28px; display: flex; align-items: center; justify-content: center; }
.size-icon { border: 1.5px solid currentColor; border-radius: 2px; }
.size-icon.sq { width: 16px; height: 16px; }
.size-icon.ls { width: 20px; height: 14px; }
.size-icon.pt { width: 14px; height: 20px; }
.size-icon.ws { width: 22px; height: 13px; }
.size-info { display: flex; flex-direction: column; min-width: 0; }
.size-ratio { font-size: 12px; font-weight: 600; line-height: 1.2; }
.size-px { font-size: 10px; color: var(--text-muted); font-weight: 400; }

/* ===== Quality ===== */
.quality-toggle { display: flex; gap: 8px; }
.quality-btn { flex: 1; display: flex; flex-direction: column; align-items: center; gap: 2px; padding: 10px 8px; border: 1.5px solid var(--border); border-radius: var(--radius); background: var(--bg); color: var(--text-secondary); font-family: var(--font); cursor: pointer; transition: var(--transition); }
.quality-btn:hover { border-color: var(--text-muted); color: var(--text); }
.quality-btn.active { border-color: var(--accent); background: var(--accent-soft); color: var(--text); }
.q-label { font-size: 12px; font-weight: 600; }
.q-desc { font-size: 10px; color: var(--text-muted); }

/* ===== Primary Button ===== */
.primary-btn { position: relative; display: flex; align-items: center; justify-content: center; width: 100%; padding: 14px; border: none; border-radius: var(--radius-lg); background: var(--accent); color: #fff; font-size: 14px; font-weight: 600; font-family: var(--font); cursor: pointer; transition: var(--transition); margin-top: 8px; flex-shrink: 0; }
.primary-btn:hover { background: var(--accent-hover); }
.primary-btn:active { transform: scale(0.98); }
.primary-btn:disabled { opacity: 0.4; cursor: not-allowed; transform: none; }
.primary-btn.compact { width: auto; padding: 10px 24px; font-size: 13px; }
.btn-content { display: flex; align-items: center; gap: 8px; }
.btn-loading { display: flex; align-items: center; gap: 8px; }
.btn-spinner { width: 16px; height: 16px; border: 2px solid rgba(255,255,255,0.3); border-top-color: #fff; border-radius: 50%; animation: spin 0.7s linear infinite; }

.secondary-btn { display: inline-flex; align-items: center; gap: 6px; padding: 10px 18px; border: 1.5px solid var(--border); border-radius: var(--radius); background: var(--bg); color: var(--text); font-size: 13px; font-weight: 500; font-family: var(--font); cursor: pointer; transition: var(--transition); }
.secondary-btn:hover { border-color: var(--text-muted); background: var(--bg-hover); }
.secondary-btn.full { width: 100%; justify-content: center; }
.secondary-btn.danger-outline { color: var(--danger); border-color: rgba(220,38,38,0.2); }
.secondary-btn.danger-outline:hover { background: var(--danger-soft); border-color: var(--danger); }

/* ===== Preview ===== */
.preview-area { flex: 1; display: flex; flex-direction: column; padding: 24px; overflow: hidden; background: var(--bg); }

.preview-container { flex: 1; position: relative; border-radius: var(--radius-xl); background: var(--bg-input); border: 1px solid var(--border-light); overflow: hidden; display: flex; align-items: center; justify-content: center; }
.preview-container:not(.empty) .empty-state { display: none; }

/* Empty State */
.empty-state { display: flex; flex-direction: column; align-items: center; gap: 12px; padding: 40px; text-align: center; }
.empty-icon { color: var(--text-muted); opacity: 0.5; }
.empty-title { font-size: 18px; font-weight: 600; color: var(--text); }
.empty-desc { font-size: 14px; color: var(--text-muted); max-width: 320px; }
.empty-tags { display: flex; gap: 8px; margin-top: 8px; flex-wrap: wrap; justify-content: center; }
.tag { display: inline-flex; align-items: center; gap: 4px; padding: 6px 14px; background: var(--bg); border: 1px solid var(--border); border-radius: 20px; font-size: 12px; font-weight: 500; color: var(--text-secondary); cursor: pointer; transition: var(--transition); }
.tag:hover { border-color: var(--text-muted); color: var(--text); background: var(--bg-hover); }

/* Loading */
.loading-state { position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 16px; background: rgba(250,251,252,0.92); backdrop-filter: blur(12px); z-index: 10; }
.loader-wrap { position: relative; width: 56px; height: 56px; }
.loader-ring { width: 56px; height: 56px; border: 2.5px solid var(--border); border-top-color: var(--accent); border-radius: 50%; animation: spin 1s linear infinite; }
.loader-pulse { position: absolute; inset: 12px; background: var(--accent); border-radius: 50%; opacity: 0.08; animation: pulse 2s ease-in-out infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
@keyframes pulse { 0%, 100% { transform: scale(0.8); opacity: 0.05; } 50% { transform: scale(1.2); opacity: 0.12; } }
.loading-text { font-size: 16px; font-weight: 600; color: var(--text); }
.loading-sub { font-size: 13px; color: var(--text-muted); }
.loading-progress { width: 200px; height: 3px; background: var(--border); border-radius: 2px; overflow: hidden; margin-top: 4px; }
.loading-bar { width: 40%; height: 100%; background: var(--accent); border-radius: 2px; animation: loading-slide 1.8s ease-in-out infinite; }
@keyframes loading-slide { 0% { transform: translateX(-100%); } 100% { transform: translateX(350%); } }

/* Result */
.result-state { position: relative; width: 100%; height: 100%; display: flex; align-items: center; justify-content: center; }
.result-state img { max-width: 100%; max-height: 100%; object-fit: contain; }
.result-overlay { position: absolute; bottom: 0; left: 0; right: 0; padding: 20px; background: linear-gradient(transparent, rgba(0,0,0,0.5)); display: flex; justify-content: center; opacity: 0; transition: opacity 0.25s; }
.result-state:hover .result-overlay { opacity: 1; }
.result-actions { display: flex; gap: 8px; }
.action-pill { display: flex; align-items: center; gap: 6px; padding: 8px 16px; border: 1px solid rgba(255,255,255,0.2); border-radius: 20px; background: rgba(0,0,0,0.4); backdrop-filter: blur(12px); color: #fff; font-size: 12px; font-weight: 500; font-family: var(--font); cursor: pointer; transition: var(--transition); }
.action-pill:hover { background: rgba(0,0,0,0.6); border-color: rgba(255,255,255,0.35); }

.gen-info { display: flex; gap: 20px; padding: 14px 4px 0; }
.gen-info-item { display: flex; align-items: center; gap: 6px; font-size: 12px; color: var(--text-muted); font-weight: 500; }

/* ===== Upload Zone ===== */
.upload-zone { position: relative; border: 2px dashed var(--border); border-radius: var(--radius-lg); padding: 28px; text-align: center; cursor: pointer; transition: var(--transition); overflow: hidden; min-height: 150px; display: flex; align-items: center; justify-content: center; background: var(--bg); }
.upload-zone.compact { min-height: 80px; padding: 16px; }
.upload-zone:hover { border-color: var(--text-muted); background: var(--bg-hover); }
.upload-zone.dragover { border-color: var(--accent); background: var(--accent-soft); }
.upload-placeholder { display: flex; flex-direction: column; align-items: center; gap: 10px; }
.upload-placeholder.compact { flex-direction: row; gap: 8px; }
.upload-placeholder.compact span { font-size: 12px; }
.upload-icon-circle { width: 48px; height: 48px; border-radius: 50%; background: var(--bg-input); display: flex; align-items: center; justify-content: center; color: var(--text-muted); }
.upload-text { font-size: 13px; font-weight: 500; color: var(--text-secondary); }
.upload-hint { font-size: 11px; color: var(--text-muted); }
.upload-zone img { max-width: 100%; max-height: 200px; object-fit: contain; border-radius: 6px; }

/* ===== Select ===== */
.select-wrap { position: relative; }
.select-input { width: 100%; padding: 10px 14px; background: var(--bg); border: 1.5px solid var(--border); border-radius: var(--radius); color: var(--text); font-family: var(--font); font-size: 13px; cursor: pointer; appearance: none; background-image: url("data:image/svg+xml,%3Csvg width='12' height='8' viewBox='0 0 12 8' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1.5L6 6.5L11 1.5' stroke='%239ca3b0' stroke-width='1.5' stroke-linecap='round'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 12px center; transition: border-color var(--transition); }
.select-input:focus { outline: none; border-color: var(--border-focus); }

/* ===== History ===== */
.history-toolbar { display: flex; align-items: center; justify-content: space-between; padding: 16px 28px; border-bottom: 1px solid var(--border-light); flex-shrink: 0; }
.history-tabs { display: flex; gap: 1px; background: var(--bg-input); padding: 3px; border-radius: var(--radius); }
.htab { padding: 6px 16px; border: none; border-radius: 6px; background: transparent; color: var(--text-secondary); font-size: 12px; font-weight: 500; font-family: var(--font); cursor: pointer; transition: var(--transition); }
.htab:hover { color: var(--text); }
.htab.active { background: var(--bg-card); color: var(--text); box-shadow: var(--shadow-sm); }
.history-meta { display: flex; align-items: center; gap: 16px; }
.history-count { font-size: 12px; color: var(--text-muted); font-weight: 500; }

.history-grid { flex: 1; overflow-y: auto; padding: 24px 28px; display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 20px; align-content: start; }
.history-empty { grid-column: 1 / -1; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 12px; padding: 100px 0; text-align: center; }

.history-card { background: var(--bg-card); border: 1px solid var(--border-light); border-radius: var(--radius-lg); overflow: hidden; cursor: pointer; transition: var(--transition); }
.history-card:hover { border-color: var(--border); transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.history-card-img { width: 100%; aspect-ratio: 16/10; object-fit: cover; background: var(--bg-input); display: block; }
.history-card-body { padding: 14px 16px; }
.history-card-prompt { font-size: 13px; color: var(--text); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; margin-bottom: 10px; line-height: 1.45; font-weight: 400; }
.history-card-meta { display: flex; justify-content: space-between; align-items: center; font-size: 11px; color: var(--text-muted); font-weight: 500; }
.history-card-badge { display: inline-flex; padding: 3px 8px; border-radius: 5px; font-size: 10px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.04em; }
.badge-gen { background: rgba(37,99,235,0.08); color: var(--blue); }
.badge-edit { background: rgba(124,58,237,0.08); color: var(--purple); }

/* ===== Modals ===== */
.modal-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.3); backdrop-filter: blur(4px); display: flex; align-items: center; justify-content: center; z-index: 1000; animation: fadeIn 0.15s ease; }
@keyframes fadeIn { from { opacity: 0; } }
.modal-box { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-xl); width: 460px; max-height: 90vh; overflow-y: auto; box-shadow: var(--shadow-xl); }
.modal-box.large { width: 760px; }
.modal-header { display: flex; align-items: center; justify-content: space-between; padding: 18px 24px; border-bottom: 1px solid var(--border-light); }
.modal-header h3 { display: flex; align-items: center; gap: 8px; font-size: 15px; font-weight: 600; }
.modal-close { width: 32px; height: 32px; border: none; border-radius: var(--radius); background: transparent; color: var(--text-muted); font-size: 20px; cursor: pointer; display: flex; align-items: center; justify-content: center; transition: var(--transition); }
.modal-close:hover { background: var(--bg-hover); color: var(--text); }
.modal-body { padding: 24px; display: flex; flex-direction: column; gap: 18px; }
.modal-footer { display: flex; justify-content: flex-end; gap: 10px; padding: 16px 24px; border-top: 1px solid var(--border-light); }

.field-group { display: flex; flex-direction: column; gap: 6px; }
.field-hint { font-size: 11px; color: var(--text-muted); }
.text-input { width: 100%; padding: 10px 14px; background: var(--bg-input); border: 1.5px solid var(--border); border-radius: var(--radius); color: var(--text); font-family: var(--font); font-size: 13px; transition: border-color var(--transition); }
.text-input:focus { outline: none; border-color: var(--border-focus); box-shadow: 0 0 0 3px var(--accent-soft); }
.text-input::placeholder { color: var(--text-placeholder); }
.input-with-toggle { position: relative; }
.input-with-toggle .text-input { padding-right: 40px; }
.toggle-vis { position: absolute; right: 10px; top: 50%; transform: translateY(-50%); background: none; border: none; color: var(--text-muted); cursor: pointer; padding: 4px; border-radius: 4px; }
.toggle-vis:hover { color: var(--text-secondary); }
.conn-status { font-size: 12px; min-height: 18px; font-weight: 500; }
.conn-status.ok { color: var(--success); }
.conn-status.err { color: var(--danger); }

/* ===== Fullscreen ===== */
.fullscreen-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.92); display: flex; align-items: center; justify-content: center; z-index: 2000; cursor: zoom-out; }
.fullscreen-overlay img { max-width: 96vw; max-height: 96vh; object-fit: contain; }
.fullscreen-close { position: absolute; top: 20px; right: 24px; width: 44px; height: 44px; border: 1px solid rgba(255,255,255,0.15); border-radius: 50%; background: rgba(0,0,0,0.4); color: #fff; font-size: 22px; cursor: pointer; display: flex; align-items: center; justify-content: center; transition: var(--transition); }
.fullscreen-close:hover { background: rgba(0,0,0,0.7); }

/* ===== Detail ===== */
.detail-body { flex-direction: row; gap: 24px; }
.detail-image-wrap { flex: 1; min-width: 0; display: flex; align-items: center; justify-content: center; background: var(--bg-input); border-radius: var(--radius-lg); overflow: hidden; max-height: 420px; }
.detail-image-wrap img { max-width: 100%; max-height: 420px; object-fit: contain; }
.detail-info { width: 220px; flex-shrink: 0; display: flex; flex-direction: column; gap: 14px; }
.detail-row { display: flex; flex-direction: column; gap: 3px; }
.detail-label { font-size: 10px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-muted); }
.detail-value { font-size: 13px; color: var(--text); line-height: 1.45; }
.detail-value.prompt { color: var(--text-secondary); word-break: break-word; font-size: 12px; }

/* ===== Toast ===== */
.toast { position: fixed; bottom: 28px; left: 50%; transform: translateX(-50%) translateY(16px); padding: 12px 24px; background: var(--text); color: #fff; border-radius: var(--radius); font-size: 13px; font-weight: 500; box-shadow: var(--shadow-lg); opacity: 0; transition: all 0.3s ease; z-index: 3000; pointer-events: none; }
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ===== Status Bar ===== */
.status-bar { display: flex; align-items: center; gap: 8px; height: 28px; padding: 0 16px; background: var(--bg-panel); border-top: 1px solid var(--border-light); flex-shrink: 0; font-size: 11px; }
.status-label { color: var(--text-muted); font-weight: 500; }
.endpoint-indicator { color: var(--text-secondary); cursor: pointer; padding: 2px 8px; border-radius: 4px; transition: var(--transition); max-width: 400px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-family: 'SF Mono', 'Consolas', monospace; font-size: 10px; }
.endpoint-indicator:hover { background: var(--bg-hover); color: var(--text); }
.endpoint-indicator.unconfigured { color: var(--danger); }
.endpoint-indicator.configured { color: var(--success); }

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .generate-layout, .edit-layout { flex-direction: column; }
  .control-panel { width: 100%; min-width: 0; max-height: 50vh; border-right: none; border-bottom: 1px solid var(--border); }
  .detail-body { flex-direction: column; }
  .detail-info { width: 100%; }
  .kbd-hint { display: none; }
}