/* ==========================================================================
   PDF工具箱 全站样式（唯一样式来源）
   结构：1) Design Token 层  2) 基础层  3) 组件层  4) 区块层
         5) 主题覆盖层（body.theme-light 兼容）  6) 无障碍与动效层
   取值原则：组件层不出现字面色值，统一引用 var(--...)；深浅两套 Token 一一对应。
   ========================================================================== */

/* ===== 1. Design Token 层（深色默认） ===== */
:root{
  /* 颜色 - 主色三档 */
  --color-primary:#818cf8;
  --color-primary-hover:#6366f1;
  --color-primary-weak:rgba(129,140,248,.12);
  --color-primary-ring:rgba(129,140,248,.28);
  /* 颜色 - 中性色语义 */
  --color-bg:#0f172a;
  --color-bg-elevated:#1e293b;
  --color-bg-sunken:#0b1220;
  --color-border:#334155;
  --color-border-strong:#475569;
  --color-text:#e2e8f0;
  --color-text-strong:#f1f5f9;
  --color-text-muted:#a3b0c2;
  --color-text-dim:#94a3b8;
  --color-footer-bg:#1e293b;
  /* 颜色 - 语义色四类 */
  --color-success:#4ade80;
  --color-warning:#fbbf24;
  --color-error:#f87171;
  --color-info:#93c5fd;
  /* 图标底色三档 + 兜底 */
  --icon-bg-1:rgba(129,140,248,.20);
  --icon-bg-2:rgba(129,140,248,.14);
  --icon-bg-3:rgba(129,140,248,.26);
  --icon-bg-default:rgba(129,140,248,.16);
  /* 尺寸与节奏 */
  --radius-sm:6px;
  --radius-md:10px;
  --radius-lg:14px;
  --radius-pill:999px;
  --space-1:4px;
  --space-2:8px;
  --space-3:12px;
  --space-4:16px;
  --space-5:24px;
  --space-6:32px;
  --space-7:48px;
  --fs-h1:28px;
  --fs-h2:18px;
  --fs-card-title:15px;
  --fs-body:14px;
  --fs-note:13px;
  --fs-label:12px;
  --fs-tag:11px;
  --content-max:1200px;
  --article-max:760px;
  --gutter:20px;
  --header-h:64px;
  /* 过渡档位 */
  --dur-fast:.15s;
  --dur-base:.2s;
  --ease:ease;
  /* 断点约定：560px / 768px / 1024px（CSS 变量不可用于媒体查询条件，此处仅作记录） */
}

/* ===== 1. Design Token 层（浅色主题） ===== */
:root[data-theme="light"]{
  --color-primary:#6366f1;
  --color-primary-hover:#4f46e5;
  --color-primary-weak:rgba(99,102,241,.10);
  --color-primary-ring:rgba(99,102,241,.20);
  --color-bg:#f1f5f9;
  --color-bg-elevated:#ffffff;
  --color-bg-sunken:#f8fafc;
  --color-border:#e2e8f0;
  --color-border-strong:#cbd5e1;
  --color-text:#1e293b;
  --color-text-strong:#0f172a;
  --color-text-muted:#475569;
  --color-text-dim:#64748b;
  --color-footer-bg:#ffffff;
  --color-success:#15803d;
  --color-warning:#b45309;
  --color-error:#dc2626;
  --color-info:#1d4ed8;
  --icon-bg-1:rgba(99,102,241,.12);
  --icon-bg-2:rgba(99,102,241,.08);
  --icon-bg-3:rgba(99,102,241,.16);
  --icon-bg-default:rgba(99,102,241,.10);
}

/* ===== 2. 基础层 ===== */
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:'Inter','Microsoft YaHei',sans-serif;
  background-color:var(--color-bg);
  color:var(--color-text);
  min-height:100vh;
  background-image:radial-gradient(1200px 520px at 50% -120px,rgba(99,102,241,.16),transparent 70%);
  background-repeat:no-repeat;
}
:root[data-theme="light"] body,
body.theme-light{background-image:none}

/* ===== 3. 组件层 ===== */
.header{background:var(--color-bg-elevated);border-bottom:1px solid var(--color-border);padding:16px 24px;display:flex;align-items:center;flex-wrap:wrap;gap:12px}
.header .logo{font-size:18px;font-weight:700;color:var(--color-primary);display:flex;align-items:center;gap:8px}
.header nav{display:flex;gap:6px;flex-wrap:wrap;margin-left:20px}
.header nav a{color:var(--color-text-dim);text-decoration:none;font-size:var(--fs-label);padding:6px 12px;border-radius:var(--radius-sm);transition:all var(--dur-base);cursor:pointer}
.header nav a:hover,.header nav a.active{background:var(--color-border);color:var(--color-primary)}
.main{max-width:var(--content-max);margin:0 auto;padding:30px var(--gutter)}
.hero{text-align:center;padding:40px 0 30px}
.hero h1{font-size:var(--fs-h1);font-weight:700;color:var(--color-text-strong)}
.hero p{color:var(--color-text-dim);margin-top:8px;font-size:var(--fs-body);max-width:600px;margin-left:auto;margin-right:auto}
.tool-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:var(--space-4)}
.tool-card{background:var(--color-bg-elevated);border:1px solid var(--color-border);border-radius:var(--radius-lg);overflow:hidden;cursor:pointer;transition:all var(--dur-base)}
.tool-card:hover{border-color:var(--color-primary);transform:translateY(-2px);box-shadow:0 8px 25px var(--color-primary-weak)}
.tool-card .head{padding:20px 20px 0;display:flex;gap:14px;align-items:flex-start}
.tool-card .icon{width:44px;height:44px;border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;font-size:22px;flex-shrink:0;background:var(--icon-bg-default)}
.tool-card .info{flex:1}
.tool-card .info h3{font-size:var(--fs-card-title);font-weight:600;color:var(--color-text-strong);margin-bottom:4px}
.tool-card .info .scenario{font-size:var(--fs-label);color:var(--color-text-dim);margin-bottom:6px;line-height:1.4}
.tool-card .info .desc{font-size:var(--fs-note);color:var(--color-text-muted);line-height:1.5}
.tool-card .tags{padding:12px 20px 16px;display:flex;gap:6px;flex-wrap:wrap}
.tool-card .tags span{font-size:var(--fs-tag);padding:2px 8px;border-radius:var(--radius-sm);background:var(--color-bg-sunken);color:var(--color-text-dim)}
/* 分类角标 */
.tool-card{position:relative}
.cat-badge{position:absolute;top:10px;right:10px;font-size:10px;color:var(--color-text-dim);background:var(--color-bg-sunken);border:1px solid var(--color-border);padding:2px 8px;border-radius:var(--radius-md);white-space:nowrap;max-width:90px;overflow:hidden;text-overflow:ellipsis}
.use-count{font-size:10px;color:var(--color-primary);margin-left:4px;font-weight:600}
/* 搜索高亮 */
.tool-card.highlight{outline:2px solid var(--color-primary);outline-offset:-2px;transform:translateY(-1px);box-shadow:0 0 0 4px var(--color-primary-ring)}
/* 收藏星标 */
.fav-star{position:absolute;top:8px;left:10px;font-size:16px;cursor:pointer;background:none;border:none;line-height:1;z-index:2;transition:transform var(--dur-fast);opacity:.55}
.fav-star:hover{transform:scale(1.25);opacity:1}
.fav-star.active{opacity:1;filter:drop-shadow(0 0 4px rgba(251,191,36,.5))}
.backdrop{display:none;position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,.6);z-index:100;justify-content:center;align-items:center;padding:20px}
.backdrop.show{display:flex}
.modal{background:var(--color-bg-elevated);border:1px solid var(--color-border);border-radius:var(--radius-lg);width:100%;max-width:720px;max-height:90vh;overflow-y:auto;padding:28px}
.modal h2{font-size:20px;color:var(--color-text-strong);margin-bottom:4px;display:flex;align-items:center;gap:8px}
.modal .sub{color:var(--color-text-dim);font-size:var(--fs-note);margin-bottom:16px}
.modal .close{float:right;color:var(--color-text-dim);cursor:pointer;font-size:24px;line-height:1}
.modal .close:hover{color:var(--color-error)}
.drop-zone{border:2px dashed var(--color-border-strong);border-radius:var(--radius-md);padding:32px;text-align:center;cursor:pointer;transition:all var(--dur-base)}
.drop-zone:hover,.drop-zone.dragover{border-color:var(--color-primary);background:var(--color-primary-weak)}
.drop-zone.has-file{border-color:var(--color-success)}
.btn{padding:10px 24px;border-radius:var(--radius-md);border:none;font-size:var(--fs-body);font-weight:500;cursor:pointer;transition:all var(--dur-base);display:inline-flex;align-items:center;gap:6px}
.btn-primary{background:var(--color-primary);color:#fff}
.btn-primary:hover{background:var(--color-primary-hover)}
.btn-primary:disabled{opacity:.5;cursor:not-allowed}
.btn-success{background:var(--color-success);color:#fff}
.btn-success:hover{background:#16a34a}
.btn-danger{background:var(--color-error);color:#fff}
.btn-danger:hover{background:#dc2626}
.btn-sm{padding:6px 14px;font-size:var(--fs-label)}
.flex-row{display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin-top:16px;justify-content:flex-end}
.file-item{display:flex;align-items:center;justify-content:space-between;background:var(--color-bg-sunken);border:1px solid var(--color-border);border-radius:var(--radius-sm);padding:10px 14px;margin-top:8px}
.file-item .name{font-size:var(--fs-note);color:var(--color-text);max-width:300px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.file-item .size{font-size:var(--fs-tag);color:var(--color-text-dim);margin-top:2px}
.file-item .del{cursor:pointer;color:var(--color-error);font-size:18px;line-height:1;padding:0 4px}
.file-item .del:hover{color:#ff6b6b}
.sort-btn{background:var(--color-border);border:none;color:var(--color-text-dim);width:26px;height:26px;border-radius:5px;cursor:pointer;font-size:var(--fs-note);line-height:1;transition:all var(--dur-base)}
.sort-btn:hover:not(:disabled){background:var(--color-primary);color:#fff}
.sort-btn:disabled{opacity:.35;cursor:not-allowed}
.option-group{margin-top:16px}
.option-group label{display:block;font-size:var(--fs-label);color:var(--color-text-dim);margin-bottom:4px;font-weight:500}
.option-group input[type="text"],.option-group input[type="number"],.option-group input[type="password"]{width:100%;padding:8px 12px;border-radius:var(--radius-sm);border:1px solid var(--color-border);background:var(--color-bg-sunken);color:var(--color-text);font-size:var(--fs-note);outline:none;transition:border var(--dur-base)}
.option-group select{width:100%;padding:8px 12px;border-radius:var(--radius-sm);border:1px solid var(--color-border);background:var(--color-bg-sunken);color:var(--color-text);font-size:var(--fs-note);outline:none}
.option-group input[type="checkbox"],.option-group input[type="radio"]{accent-color:var(--color-primary)}
.option-group input:focus{border-color:var(--color-primary);box-shadow:0 0 0 3px var(--color-primary-weak)}
.option-group input[type="range"]{width:100%;accent-color:var(--color-primary);margin-top:4px}
.slider-val{display:flex;justify-content:space-between;font-size:var(--fs-tag);color:var(--color-text-dim);margin-top:2px}
.tab-bar{display:flex;gap:4px;margin-top:12px}
.tab-bar button{padding:6px 16px;border-radius:var(--radius-sm);border:1px solid var(--color-border);background:transparent;color:var(--color-text-dim);cursor:pointer;font-size:var(--fs-label);transition:all var(--dur-base)}
.tab-bar button.active{background:var(--color-primary);color:#fff;border-color:var(--color-primary)}
.result-box{display:none;margin-top:16px;padding:16px;background:var(--color-bg-sunken);border:1px solid var(--color-border);border-radius:var(--radius-md)}
.result-box.show{display:block}
.result-box .row{display:flex;justify-content:space-between;align-items:center;padding:6px 0;border-bottom:1px solid var(--color-border);font-size:var(--fs-note)}
.preview-box{background:var(--color-bg-sunken);border:1px solid var(--color-border);border-radius:var(--radius-sm);padding:12px;margin-top:12px}
.img-output{max-width:100%;border-radius:var(--radius-sm);margin-top:8px}
.loading{text-align:center;padding:40px}
.spinner{width:36px;height:36px;border:3px solid var(--color-border);border-top-color:var(--color-primary);border-radius:50%;animation:spin .8s linear infinite;margin:0 auto}
@keyframes spin{to{transform:rotate(360deg)}}
.ad-slot{position:relative;margin:20px 0;border:1px dashed var(--color-border-strong);border-radius:var(--radius-md);background:var(--color-bg-sunken);overflow:hidden}
.ad-slot .ad-tag{position:absolute;top:6px;right:8px;font-size:10px;color:var(--color-text-dim);background:var(--color-bg);padding:1px 6px;border-radius:var(--radius-sm);z-index:1}
.ad-slot .ad-inner{min-height:100px;display:flex;align-items:center;justify-content:center;color:var(--color-text-dim);font-size:var(--fs-label)}
.ad-slot.ad-footer{margin-top:30px}
.ad-slot.ad-footer .ad-inner{min-height:80px}
.ad-slot.ad-modal{margin-top:16px}
.ad-slot.ad-modal .ad-inner{min-height:70px}
.ad-slot:hover{border-color:var(--color-primary)}
/* 未投放任何广告时保持隐藏：容器由 inject.js 在命中规则后移除 hidden */
.ad-slot[hidden]{display:none!important}

/* ===== 进度条 ===== */
.progress-bar{width:100%;height:6px;background:var(--color-bg-elevated);border-radius:3px;overflow:hidden;margin:12px 0}
.progress-bar .fill{height:100%;background:var(--color-primary);border-radius:3px;transition:width .3s var(--ease);width:0%}
.progress-text{text-align:center;font-size:var(--fs-label);color:var(--color-text-dim);margin-top:4px}
.progress-info{display:flex;justify-content:space-between;font-size:var(--fs-tag);color:var(--color-text-dim);margin-top:2px}
.progress-info .label{color:var(--color-text-dim)}
.progress-info .value{color:var(--color-primary);font-weight:500}

/* ===== 提示信息 ===== */
.alert{padding:10px 14px;border-radius:var(--radius-sm);font-size:var(--fs-label);margin:12px 0;display:flex;align-items:flex-start;gap:8px;line-height:1.5}
.alert-warning{background:rgba(251,191,36,.1);border:1px solid rgba(251,191,36,.3);color:var(--color-warning)}
.alert-info{background:rgba(96,165,250,.1);border:1px solid rgba(96,165,250,.3);color:var(--color-info)}
.alert-success{background:rgba(34,197,94,.1);border:1px solid rgba(34,197,94,.3);color:var(--color-success)}
.alert-error{background:rgba(239,68,68,.1);border:1px solid rgba(239,68,68,.3);color:var(--color-error)}
.alert .icon{flex-shrink:0;font-size:16px;line-height:1.4}

/* ===== 文件大小提示 ===== */
.size-badge{display:inline-block;padding:1px 8px;border-radius:var(--radius-sm);font-size:10px;font-weight:500;margin-left:6px}
.size-badge.sm{background:#166534;color:var(--color-success)}
.size-badge.md{background:#92400e;color:var(--color-warning)}
.size-badge.lg{background:#7f1d1d;color:var(--color-error)}
.size-limit-note{font-size:var(--fs-tag);color:var(--color-text-dim);text-align:center;margin-top:6px;padding:4px;background:var(--color-bg-sunken);border-radius:var(--radius-sm)}

/* ===== 搜索框 ===== */
.search-wrap{max-width:560px;margin:0 auto 24px;position:relative}
.search-wrap .search-icon{position:absolute;left:14px;top:50%;transform:translateY(-50%);font-size:16px;opacity:.6}
.search-wrap input[type="search"]{width:100%;padding:12px 16px 12px 42px;border-radius:var(--radius-md);border:1px solid var(--color-border);background:var(--color-bg-elevated);color:var(--color-text);font-size:var(--fs-body);outline:none;transition:border var(--dur-base),box-shadow var(--dur-base)}
.search-wrap input[type="search"]:focus{border-color:var(--color-primary);box-shadow:0 0 0 3px var(--color-primary-weak)}
.search-wrap input[type="search"]::placeholder{color:var(--color-text-dim)}
.search-wrap .search-count{position:absolute;right:14px;top:50%;transform:translateY(-50%);font-size:var(--fs-tag);color:var(--color-text-dim);background:var(--color-bg-sunken);padding:2px 8px;border-radius:var(--radius-md)}
.search-empty{display:none;text-align:center;padding:40px;color:var(--color-text-dim);font-size:var(--fs-body);grid-column:1/-1}
.search-empty .emoji{font-size:40px;margin-bottom:8px;display:block}

/* ===== 分类导航条 ===== */
.cat-nav{display:flex;gap:8px;flex-wrap:wrap;justify-content:center;margin:0 auto 20px;max-width:900px}
.cat-nav button{background:var(--color-bg-elevated);border:1px solid var(--color-border);color:var(--color-text-dim);font-size:var(--fs-label);padding:6px 14px;border-radius:var(--radius-pill);cursor:pointer;transition:all var(--dur-base)}
.cat-nav button:hover{background:var(--color-border);color:var(--color-primary);border-color:var(--color-primary)}
@media (max-width:560px){
  .cat-nav{gap:6px}
  .cat-nav button{font-size:var(--fs-tag);padding:5px 10px}
}

/* ===== 统计信息栏 ===== */
.stats-bar{display:flex;justify-content:center;gap:12px;flex-wrap:wrap;margin:0 auto 24px;max-width:720px}
.stat-item{display:flex;flex-direction:column;align-items:center;background:var(--color-bg-elevated);border:1px solid var(--color-border);border-radius:var(--radius-lg);padding:10px 22px;min-width:96px}
.stat-item .stat-num{font-size:22px;font-weight:700;color:var(--color-primary)}
.stat-item .stat-label{font-size:var(--fs-tag);color:var(--color-text-dim);margin-top:2px;text-align:center}
.stat-item.security{flex-direction:row;gap:6px;align-items:center;background:rgba(34,197,94,.08);border-color:rgba(34,197,94,.3)}
.stat-item.security .stat-num{font-size:16px}
@media (max-width:560px){
  .stat-item{padding:8px 14px;min-width:72px}
  .stat-item .stat-num{font-size:18px}
}

/* ===== 返回顶部按钮 ===== */
.back-to-top{position:fixed;right:20px;bottom:20px;width:44px;height:44px;border-radius:50%;background:var(--color-primary);color:#fff;border:none;font-size:20px;cursor:pointer;display:none;align-items:center;justify-content:center;box-shadow:0 4px 15px var(--color-primary-ring);z-index:90;transition:all var(--dur-base)}
.back-to-top:hover{background:var(--color-primary-hover);transform:translateY(-2px)}
.back-to-top.show{display:flex}
@media (max-width:560px){
  .back-to-top{right:14px;bottom:14px;width:38px;height:38px;font-size:17px}
}

/* ===== 相关工具推荐 ===== */
.related-tools{margin-top:20px;padding-top:14px;border-top:1px solid var(--color-border)}
.related-title{font-size:var(--fs-label);color:var(--color-text-dim);margin-bottom:8px}
.related-list{display:flex;gap:8px;flex-wrap:wrap}
.related-list button{background:var(--color-bg-sunken);border:1px solid var(--color-border);color:var(--color-text-dim);font-size:var(--fs-label);padding:6px 12px;border-radius:var(--radius-sm);cursor:pointer;transition:all var(--dur-base)}
.related-list button:hover{border-color:var(--color-primary);color:var(--color-primary)}

/* ===== 页脚 ===== */
.site-footer{margin-top:40px;border-top:1px solid var(--color-border);background:var(--color-footer-bg);padding:28px 20px;text-align:center}
.site-footer .footer-logo{font-size:15px;font-weight:700;color:var(--color-primary);margin-bottom:8px}
.site-footer p{font-size:var(--fs-label);color:var(--color-text-dim);line-height:1.8;max-width:700px;margin:0 auto}
.site-footer .footer-links{margin-top:6px;color:var(--color-text-dim)}
.site-footer .footer-copy{margin-top:10px;font-size:var(--fs-tag);color:var(--color-border-strong)}
.site-footer a{color:var(--color-text-dim);text-decoration:none}
.site-footer a:hover{color:var(--color-primary)}

/* ===== Toast 轻提示 ===== */
.toast-wrap{position:fixed;top:18px;left:50%;transform:translateX(-50%);z-index:300;display:flex;flex-direction:column;gap:8px;align-items:center;pointer-events:none;max-width:92vw}
.toast{pointer-events:auto;background:var(--color-bg-elevated);border:1px solid var(--color-border-strong);border-left:3px solid var(--color-warning);color:var(--color-text);font-size:var(--fs-note);line-height:1.5;padding:10px 16px;border-radius:var(--radius-sm);box-shadow:0 8px 24px rgba(0,0,0,.35);max-width:80vw;word-break:break-word;cursor:pointer;animation:toastIn .22s var(--ease)}
.toast.t-error{border-left-color:var(--color-error)}
.toast.t-success{border-left-color:var(--color-success)}
.toast.t-info{border-left-color:var(--color-info)}
.toast.hide{opacity:0;transform:translateY(-8px);transition:all .25s}
@keyframes toastIn{from{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:none}}

/* ===== 分类导航锚点化（a 标签适配，保留 button 兼容） ===== */
.cat-nav a{background:var(--color-bg-elevated);border:1px solid var(--color-border);color:var(--color-text-dim);font-size:var(--fs-label);padding:6px 14px;border-radius:var(--radius-pill);cursor:pointer;text-decoration:none;transition:all var(--dur-base)}
.cat-nav a:hover{background:var(--color-border);color:var(--color-primary);border-color:var(--color-primary)}
@media (max-width:560px){.cat-nav a{font-size:var(--fs-tag);padding:5px 10px}}

/* ===== 工具卡片链接化（a.tool-card 行为对齐 div.tool-card） ===== */
a.tool-card{display:block;text-decoration:none;color:inherit}
a.tool-card:hover{border-color:var(--color-primary);transform:translateY(-2px);box-shadow:0 8px 25px var(--color-primary-weak)}

/* ===== 热门搜索 / 最近搜索 / 空态推荐 ===== */
.hot-keywords{display:flex;gap:8px;flex-wrap:wrap;justify-content:center;max-width:900px;margin:0 auto 16px;align-items:center}
.hot-keywords .hk-label{font-size:var(--fs-label);color:var(--color-text-dim);white-space:nowrap}
.hot-keywords .hk-btn{background:var(--color-bg-elevated);border:1px solid var(--color-border);color:var(--color-text-dim);font-size:var(--fs-label);padding:5px 12px;border-radius:16px;cursor:pointer;text-decoration:none;transition:all var(--dur-base)}
.hot-keywords .hk-btn:hover{border-color:var(--color-primary);color:var(--color-primary);background:var(--color-border)}
.hot-keywords .hk-btn.recent{background:var(--color-bg-sunken);border-style:dashed}
.hot-keywords .hk-clear{cursor:pointer;color:var(--color-text-dim);font-size:14px;padding:0 4px;transition:color var(--dur-base)}
.hot-keywords .hk-clear:hover{color:var(--color-error)}
.empty-recommend{display:flex;gap:8px;flex-wrap:wrap;justify-content:center;margin-top:16px}
.empty-recommend .hk-btn{background:var(--color-bg-elevated);border:1px solid var(--color-border);color:var(--color-text-dim);font-size:var(--fs-label);padding:6px 14px;border-radius:var(--radius-sm);cursor:pointer;text-decoration:none;transition:all var(--dur-base)}
.empty-recommend .hk-btn:hover{border-color:var(--color-primary);color:var(--color-primary)}
@media (max-width:560px){.hot-keywords{gap:6px}.hot-keywords .hk-btn{font-size:var(--fs-tag);padding:4px 10px}}

/* ===== 页脚链接组分隔符 ===== */
.site-footer .footer-links .fl-sep{color:var(--color-border-strong);margin:0 4px}

/* ===== 搜索结果页 ===== */
.search-results{max-width:var(--article-max);margin:0 auto}
.sr-list{display:flex;flex-direction:column;gap:12px}
.sr-item{display:flex;gap:14px;align-items:flex-start;background:var(--color-bg-elevated);border:1px solid var(--color-border);border-radius:var(--radius-lg);padding:16px 20px;text-decoration:none;transition:all var(--dur-base)}
.sr-item:hover{border-color:var(--color-primary);transform:translateY(-1px);box-shadow:0 6px 20px var(--color-primary-weak)}
.sr-item .sr-icon{width:44px;height:44px;border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;font-size:22px;flex-shrink:0;background:var(--icon-bg-default)}
.sr-item .sr-body{flex:1;display:flex;flex-direction:column;gap:4px}
.sr-item .sr-title{font-size:var(--fs-card-title);font-weight:600;color:var(--color-text-strong)}
.sr-item .sr-cat{font-size:var(--fs-tag);color:var(--color-text-dim)}
.sr-item .sr-desc{font-size:var(--fs-note);color:var(--color-text-muted);line-height:1.5}
@media (max-width:560px){.sr-item{padding:14px 16px;gap:10px}.sr-item .sr-icon{width:36px;height:36px;font-size:18px}.sr-item .sr-title{font-size:var(--fs-body)}}

/* ===== 工具落地页（lp- 前缀） ===== */
.lp-breadcrumb{font-size:var(--fs-label);color:var(--color-text-dim);margin-bottom:16px;display:flex;gap:6px;flex-wrap:wrap;align-items:center}
.lp-breadcrumb a{color:var(--color-text-dim);text-decoration:none;transition:color var(--dur-base)}
.lp-breadcrumb a:hover{color:var(--color-primary)}
.lp-breadcrumb .sep{color:var(--color-border-strong)}
.lp-article{max-width:var(--article-max);margin:0 auto}
.lp-article h1{font-size:26px;font-weight:700;color:var(--color-text-strong);margin-bottom:8px;line-height:1.3}
.lp-article .lp-scenario{font-size:var(--fs-body);color:var(--color-text-dim);margin-bottom:16px}
.lp-article .lp-desc{font-size:var(--fs-body);color:var(--color-text-muted);line-height:1.7;margin-bottom:24px;padding:14px 18px;background:var(--color-bg-elevated);border:1px solid var(--color-border);border-radius:var(--radius-md)}
.lp-section-title{font-size:var(--fs-h2);font-weight:600;color:var(--color-text-strong);margin:28px 0 12px;padding-bottom:8px;border-bottom:1px solid var(--color-border)}
.lp-steps{counter-reset:step;list-style:none;display:flex;flex-direction:column;gap:10px}
.lp-steps li{counter-increment:step;position:relative;padding:10px 14px 10px 44px;background:var(--color-bg-elevated);border:1px solid var(--color-border);border-radius:var(--radius-sm);font-size:var(--fs-note);color:var(--color-text-muted);line-height:1.6}
.lp-steps li::before{content:counter(step);position:absolute;left:12px;top:50%;transform:translateY(-50%);width:24px;height:24px;border-radius:50%;background:var(--color-primary);color:#fff;display:flex;align-items:center;justify-content:center;font-size:var(--fs-label);font-weight:600}
.lp-faq{display:flex;flex-direction:column;gap:10px}
.lp-faq-item{background:var(--color-bg-elevated);border:1px solid var(--color-border);border-radius:var(--radius-sm);overflow:hidden}
.lp-faq-item summary{padding:12px 16px;cursor:pointer;font-size:var(--fs-note);font-weight:500;color:var(--color-text-strong);list-style:none;display:flex;justify-content:space-between;align-items:center}
.lp-faq-item summary::-webkit-details-marker{display:none}
.lp-faq-item summary::after{content:'▾';color:var(--color-text-dim);transition:transform var(--dur-base)}
.lp-faq-item[open] summary::after{transform:rotate(180deg)}
.lp-faq-item .lp-faq-a{padding:0 16px 14px;font-size:var(--fs-note);color:var(--color-text-muted);line-height:1.7}
.lp-related{display:flex;gap:8px;flex-wrap:wrap;margin-top:8px}
.lp-related a{background:var(--color-bg-elevated);border:1px solid var(--color-border);color:var(--color-text-dim);font-size:var(--fs-label);padding:6px 12px;border-radius:var(--radius-sm);text-decoration:none;transition:all var(--dur-base)}
.lp-related a:hover{border-color:var(--color-primary);color:var(--color-primary)}
.lp-tool-area{margin:24px 0;padding:20px;background:var(--color-bg-elevated);border:1px solid var(--color-border);border-radius:var(--radius-lg)}
.lp-tool-area .loading{text-align:center;padding:30px}
.lp-noscript-tip{padding:14px;background:rgba(251,191,36,.1);border:1px solid rgba(251,191,36,.3);border-radius:var(--radius-sm);color:var(--color-warning);font-size:var(--fs-note);text-align:center;margin-bottom:12px}

/* ===== 4. 区块层：分类区块全局类（取代首页内联样式） ===== */
.category-section{grid-column:1/-1;margin-top:var(--space-2);scroll-margin-top:calc(var(--header-h) + var(--space-5))}
.category-title{font-size:var(--fs-h2);color:var(--color-text-strong);font-weight:600;padding:var(--space-2) 0}
.category-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:var(--space-4)}

/* ===== 图标底色体系（data-cat 映射，缺失走兜底） ===== */
.tool-card .icon[data-cat="pdf-process"],
.tool-card .icon[data-cat="pdf-convert"],
.sr-item .sr-icon[data-cat="pdf-process"],
.sr-item .sr-icon[data-cat="pdf-convert"]{background:var(--icon-bg-1)}
.tool-card .icon[data-cat="pdf-viewer"],
.tool-card .icon[data-cat="pdf-security"],
.sr-item .sr-icon[data-cat="pdf-viewer"],
.sr-item .sr-icon[data-cat="pdf-security"]{background:var(--icon-bg-2)}
.tool-card .icon[data-cat="img-tools"],
.tool-card .icon[data-cat="other"],
.sr-item .sr-icon[data-cat="img-tools"],
.sr-item .sr-icon[data-cat="other"]{background:var(--icon-bg-3)}

/* ===== 5. 主题覆盖层（body.theme-light 兼容层，字面浅色值，可独立生效） ===== */
body.theme-light{background:#f1f5f9;color:#1e293b}
body.theme-light .header{background:#ffffff;border-bottom-color:#e2e8f0}
body.theme-light .header .logo{color:#6366f1}
body.theme-light .header nav a{color:#64748b}
body.theme-light .header nav a:hover,body.theme-light .header nav a.active{background:#eef2ff;color:#6366f1}
body.theme-light .hero h1{color:#1e293b}
body.theme-light .hero p{color:#64748b}
body.theme-light .tool-card{background:#ffffff;border-color:#e2e8f0}
body.theme-light .tool-card:hover{border-color:#818cf8;box-shadow:0 8px 25px rgba(99,102,241,.12)}
body.theme-light .tool-card .info h3{color:#1e293b}
body.theme-light .tool-card .info .scenario{color:#64748b}
body.theme-light .tool-card .info .desc{color:#475569}
body.theme-light .tool-card .tags span{background:#f1f5f9;color:#64748b}
body.theme-light .cat-badge{background:#f1f5f9;border-color:#e2e8f0;color:#64748b}
body.theme-light .modal{background:#ffffff;border-color:#e2e8f0}
body.theme-light .modal h2{color:#1e293b}
body.theme-light .drop-zone{border-color:#cbd5e1}
body.theme-light .drop-zone:hover,body.theme-light .drop-zone.dragover{border-color:#818cf8;background:rgba(99,102,241,.05)}
body.theme-light .file-item{background:#f8fafc;border-color:#e2e8f0}
body.theme-light .file-item .name{color:#1e293b}
body.theme-light .option-group label{color:#64748b}
body.theme-light .option-group input[type="text"],body.theme-light .option-group input[type="number"],body.theme-light .option-group input[type="password"],body.theme-light .option-group select{background:#f8fafc;border-color:#e2e8f0;color:#1e293b}
body.theme-light .tab-bar button{border-color:#e2e8f0;color:#64748b}
body.theme-light .tab-bar button.active{background:#818cf8;border-color:#818cf8;color:#fff}
body.theme-light .result-box{background:#f8fafc;border-color:#e2e8f0}
body.theme-light .result-box .row{border-bottom-color:#e2e8f0}
body.theme-light .preview-box{background:#f8fafc;border-color:#e2e8f0}
body.theme-light .slider-val{color:#94a3b8}
body.theme-light .size-limit-note{background:#f8fafc;color:#64748b}
body.theme-light .alert-info{background:rgba(59,130,246,.08);border-color:rgba(59,130,246,.25);color:#1d4ed8}
body.theme-light .alert-warning{background:rgba(245,158,11,.1);border-color:rgba(245,158,11,.3);color:#b45309}
body.theme-light .alert-error{background:rgba(239,68,68,.08);border-color:rgba(239,68,68,.25);color:#dc2626}
body.theme-light .cat-nav button{background:#ffffff;border-color:#e2e8f0;color:#64748b}
body.theme-light .cat-nav button:hover{border-color:#818cf8;color:#6366f1}
body.theme-light .stat-item{background:#ffffff;border-color:#e2e8f0}
body.theme-light .stat-item.security{background:rgba(34,197,94,.08);border-color:rgba(34,197,94,.25)}
body.theme-light .search-wrap input[type="search"]{background:#ffffff;border-color:#e2e8f0;color:#1e293b}
body.theme-light .search-wrap input[type="search"]:focus{border-color:#818cf8;box-shadow:0 0 0 3px rgba(99,102,241,.15)}
body.theme-light .site-footer{background:#ffffff;border-top-color:#e2e8f0}
body.theme-light .site-footer p{color:#64748b}
body.theme-light .site-footer .footer-links{color:#475569}
body.theme-light .site-footer .footer-copy{color:#94a3b8}
body.theme-light .ad-slot{background:#f8fafc;border-color:#e2e8f0}
body.theme-light .loading p{color:#64748b}
body.theme-light .spinner{border-color:#e2e8f0;border-top-color:#818cf8}
body.theme-light .back-to-top{background:#6366f1}
body.theme-light .related-list button{background:#f8fafc;border-color:#e2e8f0;color:#64748b}
body.theme-light .progress-info .label{color:#64748b}
body.theme-light .progress-info .value{color:#6366f1}
body.theme-light .toast{background:#ffffff;border-color:#e2e8f0;color:#1e293b;box-shadow:0 8px 24px rgba(15,23,42,.15)}
body.theme-light .cat-nav a{background:#ffffff;border-color:#e2e8f0;color:#64748b}
body.theme-light .cat-nav a:hover{border-color:#818cf8;color:#6366f1}
body.theme-light .hot-keywords .hk-btn{background:#ffffff;border-color:#e2e8f0;color:#64748b}
body.theme-light .hot-keywords .hk-btn:hover{border-color:#818cf8;color:#6366f1;background:#eef2ff}
body.theme-light .hot-keywords .hk-btn.recent{background:#f8fafc}
body.theme-light .hot-keywords .hk-label{color:#94a3b8}
body.theme-light .empty-recommend .hk-btn{background:#ffffff;border-color:#e2e8f0;color:#64748b}
body.theme-light .empty-recommend .hk-btn:hover{border-color:#818cf8;color:#6366f1}
body.theme-light .site-footer .footer-links .fl-sep{color:#cbd5e1}
body.theme-light .sr-item{background:#ffffff;border-color:#e2e8f0}
body.theme-light .sr-item:hover{border-color:#818cf8;box-shadow:0 6px 20px rgba(99,102,241,.1)}
body.theme-light .sr-item .sr-title{color:#1e293b}
body.theme-light .sr-item .sr-cat{color:#94a3b8}
body.theme-light .sr-item .sr-desc{color:#475569}
body.theme-light .lp-article h1{color:#1e293b}
body.theme-light .lp-article .lp-scenario{color:#64748b}
body.theme-light .lp-article .lp-desc{background:#ffffff;border-color:#e2e8f0;color:#475569}
body.theme-light .lp-section-title{color:#1e293b;border-bottom-color:#e2e8f0}
body.theme-light .lp-steps li{background:#ffffff;border-color:#e2e8f0;color:#475569}
body.theme-light .lp-faq-item{background:#ffffff;border-color:#e2e8f0}
body.theme-light .lp-faq-item summary{color:#1e293b}
body.theme-light .lp-faq-item .lp-faq-a{color:#64748b}
body.theme-light .lp-related a{background:#ffffff;border-color:#e2e8f0;color:#64748b}
body.theme-light .lp-related a:hover{border-color:#818cf8;color:#6366f1}
body.theme-light .lp-tool-area{background:#ffffff;border-color:#e2e8f0}
body.theme-light .lp-breadcrumb{color:#94a3b8}
body.theme-light .lp-breadcrumb a{color:#64748b}
body.theme-light .lp-breadcrumb .sep{color:#cbd5e1}

/* ===== 6. 无障碍与动效层 ===== */
:focus-visible{outline:2px solid var(--color-primary);outline-offset:2px}
@supports not selector(:focus-visible){
  :focus{outline:2px solid var(--color-primary);outline-offset:2px}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms !important;animation-iteration-count:1 !important;transition-duration:.01ms !important}
  html{scroll-behavior:auto}
  .tool-card:hover,a.tool-card:hover,.sr-item:hover,.back-to-top:hover,.fav-star:hover{transform:none}
}

/* ===== 移动端适配 ===== */
@media (max-width: 768px){
  .header{padding:12px 16px;gap:8px}
  .header .logo{font-size:16px}
  .header nav{margin-left:0;width:100%;order:3;margin-top:4px}
  .header nav a{font-size:var(--fs-label);padding:4px 10px}
  .main{padding:16px 12px}
  .hero{padding:24px 0 20px}
  .hero h1{font-size:22px}
  .hero p{font-size:var(--fs-note)}
  .tool-grid{grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:var(--space-3)}
  .category-grid{grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:var(--space-3)}
  .tool-card .head{padding:16px 16px 0;gap:10px}
  .tool-card .icon{width:36px;height:36px;font-size:18px}
  .tool-card .info h3{font-size:var(--fs-body)}
  .tool-card .info .scenario{font-size:var(--fs-tag)}
  .tool-card .info .desc{font-size:var(--fs-label)}
  .tool-card .tags{padding:10px 16px 14px}
  .tool-card .tags span{font-size:10px}
  .modal{padding:16px;max-width:100%;border-radius:var(--radius-md);margin:0}
  .modal h2{font-size:17px}
  .modal .sub{font-size:var(--fs-label)}
  .backdrop{padding:10px;align-items:flex-start;padding-top:20px}
  .drop-zone{padding:20px 16px}
  .file-item .name{max-width:200px}
  .tab-bar{flex-wrap:wrap}
  .tab-bar button{flex:1;min-width:60px;text-align:center;padding:6px 8px;font-size:var(--fs-tag)}
  .option-group input[type="text"],.option-group input[type="number"],.option-group input[type="password"]{font-size:16px} /* 防止iOS缩放 */
  .lp-article h1{font-size:22px}
  .lp-article .lp-desc{font-size:var(--fs-note);padding:12px 14px}
  .lp-steps li{font-size:var(--fs-label);padding:10px 12px 10px 40px}
  .lp-faq-item summary{font-size:var(--fs-label)}
  .lp-faq-item .lp-faq-a{font-size:var(--fs-label)}
  .category-title{font-size:16px}
}
@media (max-width: 560px){
  .hero h1{font-size:18px}
  .file-item .name{max-width:140px}
  .modal .close{font-size:28px;padding:4px}
  .btn{padding:8px 16px;font-size:var(--fs-note)}
  .btn-sm{padding:5px 10px;font-size:var(--fs-tag)}
  .result-box .row{flex-wrap:wrap;gap:6px}
  .tool-grid{grid-template-columns:1fr;gap:var(--space-3)}
  .category-grid{grid-template-columns:1fr;gap:var(--space-3)}
}