:root {
  /* ===== 原色（默认）- 深色赛博 ===== */
  --page-bg: #0a0f1e;
  --page-bg2: #0d1428;
  --panel-bg: rgba(20,30,55,0.6);
  --panel-border: rgba(0,255,255,0.12);
  --input-bg: rgba(255,255,255,0.06);
  --input-border: rgba(0,255,255,0.12);
  --accent: #00ffff;
  --accent-rgb: 0,255,255;
  --slider-track: rgba(255,255,255,0.08);
  --accent-hover: #00e5e5;
  --accent-dim: rgba(0,255,255,0.1);
  --accent-border: rgba(0,255,255,0.18);
  --accent-glow: rgba(0,255,255,0.3);
  --text-primary: #e0e0ff;
  --text-secondary: rgba(255,255,255,0.4);
  --text-muted: rgba(255,255,255,0.2);
  --danger: #ff6666;
  --danger-rgb: 255,102,102;
  --success: #00ffff;
  --warning: #ffcc00;
  --gradient-btn: linear-gradient(135deg, #00ffff, #3b9eff);
  --tag-bg: rgba(0,255,255,0.1);
  --tag-color: #00ffff;
  --result-bg: rgba(255,255,255,0.03);
  --hover-layer: rgba(0,255,255,0.04);
  --toast-bg: rgba(0,255,255,0.1);
  --toast-color: #00ffff;
  --toast-border: rgba(0,255,255,0.2);

  /* 尺寸变量（三主题共用） */
  --sidebar-width: 220px;
  --sidebar-collapsed: 60px;
  --header-height: 64px;
  --radius: 10px;
  --card-radius: 12px;
  --btn-radius: 8px;
  --shadow: 0 2px 8px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);

  /* 旧变量别名（向后兼容，等 Phase 5 替换硬编码后移除） */
  --primary: var(--accent);
  --primary-hover: var(--accent-hover);
  --primary-light: var(--accent-dim);
  --bg: var(--page-bg);
  --bg-card: var(--panel-bg);
  --text: var(--text-primary);
  --border: var(--panel-border);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

a { color: var(--primary); text-decoration: none; }
a:hover { color: #66ffff; }

/* 按钮 */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 9px 22px; border: none; border-radius: var(--radius);
  font-size: 14px; font-weight: 500; cursor: pointer;
  transition: all 0.2s; white-space: nowrap;
}
.btn:disabled { opacity: 0.4; cursor: not-allowed; }
.btn-primary { background: var(--primary); color: #0a0f1e; font-weight: 600; }
.btn-primary:hover:not(:disabled) { background: var(--primary-hover); box-shadow: 0 0 20px rgba(0,255,255,0.2); }
.btn-outline { background: transparent; border: 1px solid var(--border); color: var(--text-secondary); }
.btn-outline:hover:not(:disabled) { border-color: rgba(0,255,255,0.3); color: var(--primary); }
.btn-danger { background: rgba(var(--danger-rgb),0.15); color: var(--danger); border: 1px solid rgba(var(--danger-rgb),0.2); }
.btn-danger:hover:not(:disabled) { background: rgba(var(--danger-rgb),0.25); }
.btn-sm { padding: 6px 14px; font-size: 12px; }
.btn-block { width: 100%; }

/* 输入框 */
.input {
  width: 100%; padding: 10px 14px;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 14px; outline: none; transition: border-color 0.2s; color: #fff;
}
.input:focus { border-color: var(--primary); box-shadow: 0 0 8px rgba(0,255,255,0.1); }
.input::placeholder { color: rgba(255,255,255,0.2); }
select.input option { background: #1a1f35; color: #fff; }
.input-group { margin-bottom: 16px; }
.input-group label { display: block; font-size: 13px; font-weight: 500; margin-bottom: 4px; color: var(--text-secondary); }

/* 卡片 */
.card {
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  padding: 24px;
  margin-bottom: 16px;
  backdrop-filter: blur(10px);
}

/* 弹窗遮罩 */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.85);
  display: flex; align-items: center; justify-content: center;
  z-index: 1000; animation: fadeIn 0.2s ease;
}
.modal {
  background: rgba(15,25,50,0.98); border: 1px solid rgba(0,255,255,0.25);
  border-radius: 16px; padding: 28px;
  width: 90%; max-width: 460px; box-shadow: 0 0 40px rgba(0,255,255,0.08);
  position: relative;
}
.modal h2 { font-size: 18px; color: var(--primary); margin-bottom: 16px; }
.modal-close {
  position: absolute; top: 12px; right: 16px;
  background: none; border: none; font-size: 28px;
  cursor: pointer; color: rgba(255,255,255,0.3); line-height: 1;
}
.modal-close:hover { color: var(--danger); }

/* 消息提示 */
.toast {
  position: fixed; top: 20px; left: 50%; transform: translateX(-50%);
  padding: 10px 24px; border-radius: var(--radius); font-size: 14px;
  z-index: 9999; box-shadow: var(--shadow-lg);
  animation: toastIn 0.3s ease;
}
.toast-success { background: #00ffff; color: #0a0f1e; font-weight: 500; }
.toast-error { background: #ff4444; color: #fff; }
.toast-info { background: rgba(0,255,255,0.15); color: #00ffff; border: 1px solid rgba(0,255,255,0.2); }
@keyframes toastIn { from { opacity: 0; transform: translateX(-50%) translateY(-10px); } to { opacity: 1; transform: translateX(-50%) translateY(0); } }

/* 加载动画 */
.loading { display: inline-block; width: 20px; height: 20px; border: 2px solid rgba(0,255,255,0.15); border-top-color: var(--primary); border-radius: 50%; animation: spin 0.6s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

/* 页面头部 */
.page-header { margin-bottom: 24px; }
.page-header h1 { font-size: 22px; font-weight: 600; color: #fff; }
.page-header p { color: var(--text-secondary); font-size: 14px; margin-top: 4px; }

/* ===== 柔粉 — 粉白渐变 ===== */
body.theme-pink {
  --page-bg: #fdf2f8;
  --page-bg2: #ffffff;
  --panel-bg: rgba(255,255,255,0.85);
  --panel-border: #f0e4ea;
  --input-bg: rgba(255,255,255,0.7);
  --input-border: #d4b8c6;
  --accent: #f472b6;
  --accent-rgb: 244,114,182;
  --slider-track: #eedee6;
  --accent-hover: #e85da3;
  --accent-dim: rgba(244,114,182,0.15);
  --accent-border: rgba(244,114,182,0.35);
  --accent-glow: rgba(244,114,182,0.4);
  --text-primary: #1a0f15;
  --text-secondary: #7a5d6c;
  --text-muted: #b097a6;
  --danger: #f43f5e;
  --danger-rgb: 244,63,94;
  --success: #22c55e;
  --gradient-btn: linear-gradient(135deg, #f472b6, #c084fc);
  --tag-bg: #fdf0f6;
  --tag-color: #e85da3;
  --result-bg: rgba(255,255,255,0.6);
  --hover-layer: rgba(244,114,182,0.04);
  --toast-bg: rgba(244,114,182,0.1);
  --toast-color: #e85da3;
  --toast-border: rgba(244,114,182,0.18);
  /* 旧变量别名 */
  --primary: var(--accent);
  --bg: var(--page-bg);
  --bg-card: var(--panel-bg);
  --text: var(--text-primary);
  --border: var(--panel-border);
}
body.theme-pink { background: linear-gradient(180deg, #fdf2f8 0%, #ffffff 280px); }

/* ===== 简约 — 浅灰底 + 蓝紫强调 ===== */
body.theme-jian {
  --page-bg: #f6f8fa;
  --page-bg2: #eef2f6;
  --panel-bg: #ffffff;
  --panel-border: #e8ecf0;
  --input-bg: #f8f9fa;
  --input-border: #c0c6d0;
  --accent: #4a7bff;
  --accent-rgb: 74,123,255;
  --slider-track: #e2e6ec;
  --accent-hover: #3568e8;
  --accent-dim: rgba(74,123,255,0.15);
  --accent-border: rgba(74,123,255,0.35);
  --accent-glow: rgba(74,123,255,0.4);
  --text-primary: #0b1a33;
  --text-secondary: #5d6b82;
  --text-muted: #9aa6b8;
  --danger: #e85a5a;
  --danger-rgb: 232,90,90;
  --success: #22c55e;
  --warning: #ffcc00;
  --gradient-btn: linear-gradient(135deg, #4a7bff, #7c5cfc);
  --tag-bg: #edf2fe;
  --tag-color: #3568e8;
  --result-bg: #f8f9fa;
  --hover-layer: rgba(0,0,0,0.03);
  --toast-bg: rgba(74,123,255,0.1);
  --toast-color: #3568e8;
  --toast-border: rgba(74,123,255,0.2);
  /* 旧变量别名 */
  --primary: var(--accent);
  --bg: var(--page-bg);
  --bg-card: var(--panel-bg);
  --text: var(--text-primary);
  --border: var(--panel-border);
}
body.theme-jian { background: linear-gradient(180deg, #f6f8fa 0%, #ffffff 280px); }

/* 响应式基础 */
@media (max-width: 768px) {
  :root {
    --header-height: 56px;
  }
}

/* ===== 公共组件类（Phase 4 统一规范） ===== */

/* 上传网格 */
.upload-grid { display: grid; grid-template-columns: repeat(5,1fr); gap: 6px; margin-bottom: 8px; min-height: 76px; }
.upload-grid-item { aspect-ratio: 1; border-radius: 8px; border: 1px solid var(--accent-border); overflow: hidden; position: relative; cursor: pointer; display: flex; align-items: center; justify-content: center; }

/* 空网格项 — 虚线边框 + 虚线十字 */
.upload-grid-item.is-empty { border: 1.5px dashed var(--accent); background: transparent; }
.upload-grid-item.is-empty .grid-cross { display: flex; }

/* 虚线十字（border 实现，兼容所有浏览器） */
.grid-cross { display: none; position: relative; width: 18px; height: 18px; color: var(--accent); opacity: 0.7; }
.grid-cross::before,
.grid-cross::after { content: ''; position: absolute; }
.grid-cross::before { width: 0; height: 100%; left: 50%; border-left: 2px dashed var(--accent); transform: translateX(-50%); }
.grid-cross::after { width: 100%; height: 0; top: 50%; border-top: 2px dashed var(--accent); transform: translateY(-50%); }

/* 上传按钮栏 */
.upload-bar { display: flex; gap: 6px; margin-bottom: 12px; }
.upload-btn { flex: 1; padding: 7px 12px; background: var(--accent-dim); border: 1.5px dashed var(--accent); border-radius: 8px; text-align: center; cursor: pointer; font-size: 13px; color: var(--accent); transition: all .25s; display: flex; align-items: center; justify-content: center; gap: 6px; font-weight: 500; }
.upload-btn:hover { background: var(--accent-glow); }
.upload-btn svg { width: 16px; height: 16px; flex-shrink: 0; }

/* 大上传区（反推提示词专用） */
.upload-zone { width: 100%; min-height: 90px; border: 2px dashed var(--accent-border); border-radius: 12px; display: flex; flex-direction: column; align-items: center; justify-content: center; cursor: pointer; transition: all .2s; background: var(--panel-bg); padding: 16px; gap: 4px; }
.upload-zone:hover { border-color: var(--accent-glow); background: var(--accent-dim); }
.upload-zone svg { width: 30px; height: 30px; color: var(--accent); }
.upload-zone .uz-text { font-size: 13px; color: var(--text-secondary); }
.upload-zone .uz-desc { font-size: 10px; color: var(--text-muted); }

/* 参数字段 */
.field-label { display: block; margin-bottom: 5px; color: var(--accent); font-size: 12px; font-weight: 500; }
.field-select, .field-input { width: 100%; padding: 9px 10px; background: var(--input-bg); border: 1px solid var(--input-border); border-radius: 8px; color: var(--text-primary); font-size: 13px; outline: none; transition: border-color .2s; }
.field-select:focus, .field-input:focus { border-color: var(--accent); }
.field-select option { background: var(--page-bg); color: var(--text-primary); }
.field-input::placeholder { color: var(--text-muted); }

/* 生成按钮 */
.btn-generate { width: 100%; padding: 11px; background: var(--gradient-btn); border: none; border-radius: 10px; color: #000; font-size: 14px; font-weight: 600; cursor: pointer; transition: all .3s; }
.btn-generate:hover { transform: scale(1.02); box-shadow: 0 0 20px var(--accent-glow); }

/* 通用弹窗样式（check-modal 系列） */
.check-modal-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,0.85);z-index:99999;display:flex;align-items:center;justify-content:center;animation:shOverlayIn 0.2s ease;}
@keyframes shOverlayIn{from{opacity:0}to{opacity:1}}
.check-modal{background:rgba(15,25,50,0.98);border:1px solid var(--accent-glow);border-radius:16px;padding:28px;width:90%;max-width:480px;position:relative;box-shadow:0 0 40px var(--accent-dim);animation:shModalIn 0.2s ease;}
@keyframes shModalIn{from{opacity:0;transform:scale(0.95) translateY(-8px)}to{opacity:1;transform:scale(1) translateY(0)}}
.check-modal-body{max-height:60vh;overflow-y:auto;padding-right:4px;}
.check-modal-header{text-align:center;margin-bottom:20px;}
.check-modal-header h3{color:var(--accent);font-size:18px;margin-bottom:4px;}
.check-modal-header p{color:var(--text-muted);font-size:13px;}
.check-modal-close{position:absolute;top:12px;right:16px;background:none;border:none;color:var(--text-muted);font-size:28px;cursor:pointer;line-height:1;transition:color 0.2s;}
.check-modal-close:hover{color:var(--danger);}
.check-field{margin-bottom:12px;}
.check-input{width:100%;padding:12px 14px;background:var(--input-bg);border:1px solid var(--accent-border);border-radius:8px;color:var(--text-primary);font-size:14px;outline:none;transition:border-color 0.2s;box-sizing:border-box;}
.check-input:focus{border-color:var(--accent);}
.check-input::placeholder{color:var(--text-muted);}
.check-error{color:var(--danger);font-size:13px;margin-bottom:10px;display:none;}
.check-error.show{display:block;}
.check-btn{width:100%;padding:12px;border:none;border-radius:8px;font-size:15px;font-weight:600;cursor:pointer;transition:all 0.2s;margin-top:4px;}
.check-btn-primary{background:var(--accent);color:var(--page-bg);}
.check-btn-primary:hover{background:var(--accent-hover);}