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

  /* ════════════════════════════════════════
     默认主题 — 深空蓝 (dark-blue)
     深邃夜空，蓝紫为主，适合专注创作
     ════════════════════════════════════════ */
  :root{
    --bg:#0a0e17;--surface:#111827;--border:#1e293b;
    --primary:#6366f1;--primary-hover:#818cf8;
    --accent:#f59e0b;--accent-hover:#fbbf24;
    --teal:#14b8a6;--teal-hover:#2dd4bf;
    --text:#e2e8f0;--text-dim:#94a3b8;
    --success:#22c55e;--error:#ef4444;--radius:12px;
    --glow: rgba(99,102,241,.15);
  }

  /* ── 主题 2: 暗夜紫 ──
     深紫背景，品红强调，神秘浪漫 */
  html[data-theme="purple"]{
    --bg:#120c1c;--surface:#1e1530;--border:#362952;
    --primary:#c084fc;--primary-hover:#d8b4fe;
    --accent:#f472b6;--accent-hover:#f9a8d4;
    --teal:#2dd4bf;--teal-hover:#5eead4;
    --text:#e9d5ff;--text-dim:#a78bfa;
    --glow: rgba(192,132,252,.15);
  }

  /* ── 主题 3: 赛博绿 ──
     深灰背景，霓虹荧光绿，科技感 */
  html[data-theme="green"]{
    --bg:#0c0c0c;--surface:#141414;--border:#2a2a2a;
    --primary:#22c55e;--primary-hover:#4ade80;
    --accent:#06b6d4;--accent-hover:#22d3ee;
    --teal:#10b981;--teal-hover:#34d399;
    --text:#d9f99d;--text-dim:#86efac;
    --glow: rgba(34,197,94,.15);
  }
  html[data-theme="green"] .sidebar{background:#0a0a0a}

  /* ── 主题 4: 暖橙日落 ──
     暖棕背景，日落橙红，温暖治愈 */
  html[data-theme="sunset"]{
    --bg:#1c1108;--surface:#2a1a0e;--border:#4d3020;
    --primary:#f97316;--primary-hover:#fb923c;
    --accent:#fbbf24;--accent-hover:#fcd34d;
    --teal:#34d399;--teal-hover:#6ee7b7;
    --text:#fde68a;--text-dim:#fbbf24;
    --glow: rgba(249,115,22,.18);
  }
  html[data-theme="sunset"] .card{border-color:#5a3a28}

  /* ── 主题 5: 冷灰极简 ──
     纯黑白灰，无彩色干扰，极致简约 */
  html[data-theme="minimal"]{
    --bg:#0d0d0d;--surface:#1a1a1a;--border:#333;
    --primary:#e5e5e5;--primary-hover:#fff;
    --accent:#a3a3a3;--accent-hover:#ccc;
    --teal:#9ca3af;--teal-hover:#d1d5db;
    --text:#f5f5f5;--text-dim:#9ca3af;
    --success:#22c55e;--error:#ef4444;
    --glow: rgba(255,255,255,.06);
  }
  html[data-theme="minimal"] .card{border-color:#2a2a2a}
  html[data-theme="minimal"] .sidebar{background:#080808}
  html[data-theme="minimal"] .nav-btn{color:#9ca3af}
  html[data-theme="minimal"] .nav-btn.active{background:#fff;color:#000}
  html[data-theme="minimal"] .msg.assistant{background:#1a1a1a}

  /* ── 主题 6: 纯白亮色 ──
     白底灰边，清晰干净，适合白天阅读 */
  html[data-theme="light"]{
    --bg:#f8fafc;--surface:#ffffff;--border:#e2e8f0;
    --primary:#4f46e5;--primary-hover:#4338ca;
    --accent:#d97706;--accent-hover:#b45309;
    --teal:#0d9488;--teal-hover:#0f766e;
    --text:#0f172a;--text-dim:#64748b;
    --success:#16a34a;--error:#dc2626;
    --glow: rgba(79,70,229,.1);
  }
  html[data-theme="light"] .card{box-shadow:0 1px 4px rgba(0,0,0,.06);border-color:#e2e8f0}
  html[data-theme="light"] .chat-box{box-shadow:inset 0 1px 3px rgba(0,0,0,.04)}
  html[data-theme="light"] .sidebar{background:#fff;border-right:1px solid #e2e8f0}
  html[data-theme="light"] .nav-btn{color:#475569}
  html[data-theme="light"] .nav-btn.active{background:#4f46e5;color:#fff}
  html[data-theme="light"] .msg.user{color:#fff}
  html[data-theme="light"] .msg.assistant{background:#fff;border:1px solid #e2e8f0}
  html[data-theme="light"] .result-wrap{border:1px solid var(--border)}

  body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Noto Sans SC',sans-serif;background:var(--bg);color:var(--text);min-height:100vh;transition:background .3s,color .3s;padding-top:6px}

  /* ── Header ── */
  header{text-align:center;padding:24px 20px 6px}
  header h1{font-size:clamp(1.4rem,3vw,2rem);font-weight:700;margin-bottom:4px}
  html:not([data-theme="light"]) header h1{background:linear-gradient(135deg,var(--primary),var(--accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent}
  html[data-theme="light"] header h1{color:var(--text)}
  header p{color:var(--text-dim);font-size:clamp(.78rem,1.5vw,.9rem)}

  /* ── 主题切换器 ── */
  .theme-switcher{display:flex;justify-content:center;gap:6px;margin:10px 0 14px;flex-wrap:wrap;padding:0 10px}
  .theme-btn{width:28px;height:28px;border-radius:50%;border:2px solid var(--border);cursor:pointer;transition:.2s;position:relative;font-size:.7rem;font-family:inherit;background:var(--bg)}
  .theme-btn:hover{transform:scale(1.15);border-color:var(--text-dim)}
  .theme-btn.active{border-color:var(--primary);box-shadow:0 0 0 2px var(--glow)}
  .theme-btn .tip{position:absolute;bottom:-20px;left:50%;transform:translateX(-50%);font-size:.65rem;color:var(--text-dim);white-space:nowrap;opacity:0;transition:.2s;pointer-events:none}
  .theme-btn:hover .tip{opacity:1}

  /* ── 左右布局 ── */
  .app-layout{display:flex;gap:0;max-width:min(1600px,98vw);margin:0 auto;padding:0 10px 40px;min-height:calc(100vh - 120px)}
  
  .sidebar{width:200px;flex-shrink:0;position:sticky;top:10px;align-self:flex-start;max-height:calc(100vh - 30px);overflow-y:auto;padding:10px 6px;display:flex;flex-direction:column;gap:4px}
  .sidebar .logo{font-size:.92rem;font-weight:700;padding:8px 12px 16px;background:linear-gradient(135deg,var(--primary),var(--accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent;margin-bottom:4px;display:none}
  .sidebar .theme-row{display:flex;gap:4px;padding:8px 8px 12px;flex-wrap:wrap;border-bottom:1px solid var(--border);margin-bottom:6px}
  .sidebar .user-section{display:flex;gap:4px;padding:4px 0 8px;border-bottom:1px solid var(--border);margin-bottom:6px}
  .sidebar .user-section select{flex:1;background:var(--surface);color:var(--text);border:1px solid var(--border);border-radius:6px;padding:3px 4px;font-size:.72rem;cursor:pointer}
  .sidebar .user-section .user-add-btn{width:24px;border:1px solid var(--border);border-radius:6px;background:var(--surface);color:var(--primary);cursor:pointer;font-size:1rem;line-height:1}
  .sidebar .theme-row .theme-btn{width:22px;height:22px;border-radius:50%;border:2px solid var(--border);cursor:pointer;transition:.2s;position:relative;flex-shrink:0}
  .sidebar .theme-row .theme-btn:hover{transform:scale(1.15);border-color:var(--text-dim)}
  .sidebar .theme-row .theme-btn.active{border-color:var(--primary);box-shadow:0 0 0 2px var(--glow)}
  .sidebar .theme-row .theme-btn .tip{display:none}
  
  .sidebar .nav-btn{display:flex;align-items:center;gap:10px;width:100%;padding:11px 14px;border-radius:10px;border:none;background:transparent;color:var(--text-dim);cursor:pointer;font-size:.85rem;font-weight:600;transition:.2s;font-family:inherit;text-align:left}
  .sidebar .nav-btn:hover{background:var(--surface);color:var(--text)}
  .sidebar .nav-btn.active{background:var(--primary);color:#fff;box-shadow:0 2px 10px var(--glow)}
  .sidebar .nav-btn .nav-icon{font-size:1rem;width:24px;text-align:center;flex-shrink:0}
  .sidebar .nav-btn .nav-badge{margin-left:auto;font-size:.65rem;background:rgba(255,255,255,.2);padding:1px 6px;border-radius:8px}
  .sidebar .nav-btn.active .nav-badge{background:rgba(255,255,255,.2)}

  .main-area{flex:1;min-width:0;padding-left:16px}
  
  /* ── Container ── */
  /* 不再使用2列网格，所有卡片在main-area里纵向排列 */
  .main-area .container{max-width:100%;margin:0;padding:0;display:flex;flex-direction:column;gap:clamp(14px,2vw,20px)}
  .main-area .container .full{grid-column:auto}
  
  @media(max-width:768px){
    .app-layout{flex-direction:column;padding:0 8px 40px}
    .sidebar{width:100%;position:static;flex-direction:row;flex-wrap:wrap;gap:4px;padding:6px;overflow-x:auto;max-height:none;border-bottom:1px solid var(--border);margin-bottom:10px}
    .sidebar .theme-row{display:none}
    .sidebar .nav-btn{flex:1;min-width:80px;padding:8px 10px;font-size:.78rem;justify-content:center}
    .main-area{padding-left:0}
  }

  .card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:clamp(16px,2vw,26px);transition:background .3s,border-color .3s}
  .card h2{font-size:clamp(.92rem,1.5vw,1.05rem);margin-bottom:12px;display:flex;align-items:center;gap:8px}

  label{display:block;font-size:clamp(.75rem,1.2vw,.82rem);color:var(--text-dim);margin-bottom:4px;margin-top:10px}
  label:first-child{margin-top:0}
  textarea{width:100%;background:var(--bg);border:1px solid var(--border);border-radius:8px;color:var(--text);padding:10px 12px;font-size:clamp(.82rem,1.3vw,.9rem);resize:vertical;min-height:clamp(60px,8vh,80px);font-family:inherit;transition:border .2s;line-height:1.5}
  textarea:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px var(--glow)}
  input[type=text],select{width:100%;background:var(--bg);border:1px solid var(--border);border-radius:8px;color:var(--text);padding:8px 11px;font-size:clamp(.82rem,1.3vw,.88rem);font-family:inherit;transition:border .2s}
  input:focus,select:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px var(--glow)}

  .row{display:grid;grid-template-columns:1fr 1fr;gap:10px}

  .tabs{display:flex;gap:3px;margin-bottom:12px;background:var(--bg);border-radius:8px;padding:3px;flex-wrap:wrap}
  .tab{flex:1;padding:6px 4px;text-align:center;border-radius:6px;cursor:pointer;font-size:clamp(.7rem,1.1vw,.76rem);color:var(--text-dim);transition:.2s;border:none;background:transparent;font-family:inherit;white-space:nowrap}
  .tab.active{background:var(--primary);color:#fff;font-weight:600}
  .tab:hover:not(.active){color:var(--text)}

  .btn{width:100%;padding:clamp(9px,1.5vw,12px);border:none;border-radius:8px;font-size:clamp(.85rem,1.3vw,.95rem);font-weight:600;cursor:pointer;transition:.2s;font-family:inherit;margin-top:12px;display:flex;align-items:center;justify-content:center;gap:7px}
  .btn-sm{padding:6px 14px;font-size:.76rem;margin-top:0;width:auto}
  .btn-primary{background:var(--primary);color:#fff}
  .btn-primary:hover:not(:disabled){background:var(--primary-hover)}
  .btn-accent{background:var(--accent);color:#000}
  .btn-accent:hover:not(:disabled){background:var(--accent-hover)}
  .btn-teal{background:var(--teal);color:#000}
  .btn-teal:hover:not(:disabled){background:var(--teal-hover)}
  .btn:disabled{opacity:.5;cursor:not-allowed}

  .spinner{width:14px;height:14px;border:2px solid rgba(255,255,255,.3);border-top-color:#fff;border-radius:50%;animation:spin .6s linear infinite;display:none}
  .spinner.dark{border-color:rgba(0,0,0,.2);border-top-color:#000}
  @keyframes spin{to{transform:rotate(360deg)}}

  .result-wrap{position:relative;min-height:clamp(180px,25vh,260px);display:flex;align-items:center;justify-content:center;background:var(--bg);border-radius:8px;overflow:hidden}
  .result-img{max-width:100%;border-radius:8px;display:none}
  .result-video{max-width:100%;border-radius:8px;display:none}
  .placeholder{color:var(--text-dim);font-size:.82rem;text-align:center}
  .placeholder .icon{font-size:clamp(1.5rem,3vw,2rem);margin-bottom:4px}

  .status{margin-top:8px;padding:7px 11px;border-radius:8px;font-size:.78rem;display:none}
  .status.success{background:rgba(34,197,94,.1);border:1px solid rgba(34,197,94,.3);color:var(--success);display:block}
  .status.error{background:rgba(239,68,68,.1);border:1px solid rgba(239,68,68,.3);color:var(--error);display:block}
  .status.loading{background:rgba(99,102,241,.1);border:1px solid rgba(99,102,241,.3);color:var(--primary);display:block}

  .download-btn{position:absolute;bottom:7px;right:7px;background:rgba(0,0,0,.7);color:#fff;border:none;border-radius:6px;padding:4px 9px;cursor:pointer;font-size:.72rem;display:none;backdrop-filter:blur(4px)}
  .download-btn:hover{background:rgba(0,0,0,.9)}

  .tips{margin-top:10px;padding:10px;background:var(--bg);border-radius:8px;font-size:.75rem;color:var(--text-dim);line-height:1.6}
  .tips strong{color:var(--text)}
  .tips code{background:var(--glow);color:var(--primary-hover);padding:1px 4px;border-radius:3px;font-size:.72rem}

  .history{margin-top:8px;display:grid;grid-template-columns:repeat(auto-fill,minmax(56px,1fr));gap:4px}
  .history img,.history video{width:100%;aspect:1;border-radius:6px;object-fit:cover;cursor:pointer;border:2px solid transparent;transition:.2s;background:#000}
  .history img:hover,.history video:hover{border-color:var(--primary)}
  #img-grid .placeholder{grid-column:1/-1}

  .full{grid-column:1/-1;width:100%}
  .panel{display:none}.panel.active{display:block}
  .hidden{display:none!important}

  .progress-bar{width:100%;height:5px;background:var(--bg);border-radius:3px;margin-top:6px;overflow:hidden;display:none}
  .progress-bar .fill{height:100%;background:linear-gradient(90deg,var(--primary),var(--accent));border-radius:3px;transition:width .3s;width:0%}
  .progress-text{font-size:.72rem;color:var(--text-dim);margin-top:3px;display:none}

  /* ── 对话消息 ── */
  .chat-box{height:clamp(300px,45vh,420px);overflow-y:auto;background:var(--bg);border-radius:8px;padding:12px;margin-bottom:10px;display:flex;flex-direction:column;gap:8px;border:1px solid var(--border)}
  .chat-box::-webkit-scrollbar{width:4px}
  .chat-box::-webkit-scrollbar-thumb{background:var(--border);border-radius:2px}
  .msg{padding:8px 12px;border-radius:10px;font-size:clamp(.82rem,1.3vw,.88rem);line-height:1.55;max-width:85%;word-break:break-word}
  .msg.user{background:var(--primary);color:#fff;align-self:flex-end;border-bottom-right-radius:3px}
  .msg.assistant{background:var(--surface);border:1px solid var(--border);align-self:flex-start;border-bottom-left-radius:3px}
  .msg.assistant.streaming{animation:pulse 1.2s ease-in-out infinite}
  @keyframes pulse{0%,100%{opacity:1}50%{opacity:.7}}
  .chat-input-row{display:flex;gap:8px}
  .chat-input-row textarea{flex:1;min-height:clamp(50px,8vh,70px);max-height:120px;margin:0;padding:9px 12px}
  .chat-input-row .btn{width:auto;padding:9px 16px;margin:0;white-space:nowrap}

  /* ── AI 优化 Prompt 区域 ── */
  .optimize-box{margin-top:12px;padding:14px;background:var(--bg);border-radius:10px;border:1px solid var(--border);position:relative;overflow:hidden}
  .optimize-box::before{content:'';position:absolute;top:0;left:0;right:0;height:2px;background:linear-gradient(90deg,var(--primary),var(--accent),var(--teal));opacity:.6}
  .optimize-box .opt-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:10px}
  .optimize-box .opt-header .opt-title{font-size:.82rem;font-weight:600;color:var(--text);display:flex;align-items:center;gap:5px}
  .opt-lang-select{padding:5px 10px;font-size:.75rem;border-radius:8px;background:var(--surface);border:1px solid var(--border);color:var(--text);font-family:inherit;cursor:pointer;transition:.2s}
  .opt-lang-select:hover{border-color:var(--primary)}
  .opt-btn{display:inline-flex;align-items:center;gap:4px;padding:5px 14px;border-radius:6px;border:none;font-size:.76rem;font-weight:600;cursor:pointer;transition:.2s;font-family:inherit;background:linear-gradient(135deg,var(--primary),#8b5cf6);color:#fff;box-shadow:0 2px 8px var(--glow)}
  .opt-btn:hover{transform:translateY(-1px);box-shadow:0 3px 12px var(--glow)}
  .opt-btn:active{transform:translateY(0)}
  .opt-btn .opt-icon{font-size:.9rem}
  .opt-result{margin-top:10px;padding:12px;background:var(--surface);border-radius:8px;font-size:.82rem;line-height:1.6;border:1px solid var(--border);display:none}
  .opt-result.show{display:block;animation:optFadeIn .3s ease}
  @keyframes optFadeIn{from{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:translateY(0)}}
  .opt-actions{display:flex;gap:6px;margin-top:10px}
  .opt-actions .opt-apply{flex:2;display:inline-flex;align-items:center;justify-content:center;gap:4px;padding:7px;border-radius:8px;border:none;font-size:.78rem;font-weight:600;cursor:pointer;font-family:inherit;background:var(--primary);color:#fff;transition:.2s}
  .opt-actions .opt-apply:hover{background:var(--primary-hover)}
  .opt-actions .opt-copy{flex:1;display:inline-flex;align-items:center;justify-content:center;gap:4px;padding:7px;border-radius:8px;border:1px solid var(--border);font-size:.78rem;font-weight:600;cursor:pointer;font-family:inherit;background:var(--surface);color:var(--text);transition:.2s}
  .opt-actions .opt-copy:hover{border-color:var(--primary);color:var(--primary)}

  /* ── 快捷按钮 ── */
  .quick-btns{display:flex;gap:5px;flex-wrap:wrap;margin-top:8px}
  .quick-btn{padding:4px 10px;border-radius:14px;border:1px solid var(--border);background:var(--bg);color:var(--text-dim);cursor:pointer;font-size:.72rem;font-family:inherit;transition:.2s}
  .quick-btn:hover{border-color:var(--primary);color:var(--primary)}
  .quick-btn.active{border-color:var(--primary);color:var(--primary);background:var(--glow)}

  /* ── 图片预览模态框 ── */
  .img-preview-mask{position:fixed;inset:0;z-index:9999;background:rgba(0,0,0,.85);backdrop-filter:blur(8px);display:none;align-items:center;justify-content:center;cursor:zoom-out;animation:fadeIn .2s ease}
  .img-preview-mask.show{display:flex}
  .img-preview-mask img{max-width:92vw;max-height:92vh;border-radius:10px;box-shadow:0 20px 60px rgba(0,0,0,.5);animation:zoomIn .25s ease;cursor:default}
  .img-preview-mask .close-btn{position:absolute;top:16px;right:20px;width:36px;height:36px;border-radius:50%;background:rgba(255,255,255,.15);color:#fff;border:none;cursor:pointer;font-size:1.1rem;display:flex;align-items:center;justify-content:center;transition:.2s;font-family:inherit}
  .img-preview-mask .close-btn:hover{background:rgba(255,255,255,.3)}
  .img-preview-mask .preview-download{position:absolute;bottom:20px;right:20px;padding:8px 16px;border-radius:8px;background:var(--primary);color:#fff;border:none;cursor:pointer;font-size:.82rem;font-weight:600;font-family:inherit;transition:.2s;display:flex;align-items:center;gap:5px}
  .img-preview-mask .preview-download:hover{background:var(--primary-hover)}
  .img-preview-mask .nav-btn{position:absolute;top:50%;transform:translateY(-50%);width:44px;height:44px;border-radius:50%;background:rgba(255,255,255,.12);color:#fff;border:none;cursor:pointer;font-size:1.2rem;display:flex;align-items:center;justify-content:center;transition:.2s;font-family:inherit;backdrop-filter:blur(4px)}
  .img-preview-mask .nav-btn:hover{background:rgba(255,255,255,.25)}
  .img-preview-mask .nav-btn.prev{left:16px}
  .img-preview-mask .nav-btn.next{right:16px}
  .img-preview-mask .preview-counter{position:absolute;bottom:20px;left:50%;transform:translateX(-50%);color:rgba(255,255,255,.6);font-size:.8rem;font-family:inherit;background:rgba(0,0,0,.4);padding:4px 12px;border-radius:12px;backdrop-filter:blur(4px)}

  /* ── 待处理任务 ── */
  .pending-task-item{display:flex;align-items:center;gap:10px;padding:10px 12px;background:var(--bg);border-radius:8px;border:1px solid var(--border);margin-bottom:6px;transition:.2s}
  .pending-task-item:last-child{margin-bottom:0}
  .pending-task-item .pt-info{flex:1;min-width:0}
  .pending-task-item .pt-prompt{font-size:.82rem;color:var(--text);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
  .pending-task-item .pt-meta{font-size:.72rem;color:var(--text-dim);margin-top:2px}
  .pending-task-item .pt-status{padding:3px 10px;border-radius:12px;font-size:.72rem;font-weight:600;white-space:nowrap}
  .pending-task-item .pt-status.queued{background:rgba(99,102,241,.15);color:var(--primary)}
  .pending-task-item .pt-status.progress{background:rgba(245,158,11,.15);color:var(--accent)}
  .pending-task-item .pt-status.done{background:rgba(34,197,94,.15);color:var(--success)}
  .pending-task-item .pt-status.failed{background:rgba(239,68,68,.15);color:var(--error)}
  .pending-task-item .pt-btn{padding:5px 12px;border-radius:6px;border:none;font-size:.72rem;font-weight:600;cursor:pointer;font-family:inherit;transition:.2s;white-space:nowrap}
  .pending-task-item .pt-btn:hover{opacity:.8}
  .pt-empty{text-align:center;padding:20px;color:var(--text-dim);font-size:.82rem}
  @keyframes fadeIn{from{opacity:0}to{opacity:1}}
  @keyframes zoomIn{from{opacity:0;transform:scale(.92)}to{opacity:1;transform:scale(1)}}
  @keyframes shimmer{0%{background-position:200% 0}100%{background-position:-200% 0}}