/* ============================================================
   在线工具站 - 共享样式
   移动优先 · 8px 网格 · 干净克制
   ============================================================ */

/* ----- CSS 变量 ----- */
:root {
  --c-brand: #4f6ef7;
  --c-brand-hover: #3b5de7;
  --c-brand-light: #eef1fe;
  --c-bg: #f3f4f6;
  --c-card: #ffffff;
  --c-text: #1e293b;
  --c-text-secondary: #64748b;
  --c-text-muted: #94a3b8;
  --c-border: #e2e8f0;
  --c-tag-bg: #eef2ff;
  --c-tag-text: #4f6ef7;
  --c-danger: #ef4444;
  --c-success: #16a34a;
  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 14px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.04);
  --shadow: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --shadow-lg: 0 10px 30px -10px rgba(0,0,0,.10);
  --max-w: 1200px;
  --header-h: 56px;
  --gap: 16px;
}

/* ----- Reset ----- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{font-size:16px;-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;
  background:var(--c-bg);color:var(--c-text);line-height:1.6;min-height:100vh;
  -webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;
}
a{color:var(--c-brand);text-decoration:none}
a:hover{color:var(--c-brand-hover)}
img,svg{display:block;max-width:100%}
button,input,select,textarea{font:inherit;color:inherit}
::selection{background:var(--c-brand-light);color:var(--c-brand)}
:focus-visible{outline:2px solid var(--c-brand);outline-offset:2px;border-radius:2px}
::-webkit-scrollbar{width:6px;height:6px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:#cbd5e1;border-radius:3px}
::-webkit-scrollbar-thumb:hover{background:#94a3b8}

/* ----- 顶部导航 ----- */
.site-header{
  position:sticky;top:0;z-index:100;
  background:rgba(255,255,255,.82);backdrop-filter:blur(16px) saturate(180%);
  -webkit-backdrop-filter:blur(16px) saturate(180%);
  border-bottom:1px solid var(--c-border);height:var(--header-h);
  display:flex;align-items:center;
}
.site-header .inner{
  max-width:var(--max-w);width:100%;margin:0 auto;padding:0 24px;
  display:flex;align-items:center;justify-content:space-between;gap:16px;
}
.site-logo{
  font-size:1.15rem;font-weight:700;color:var(--c-text);
  display:flex;align-items:center;gap:6px;white-space:nowrap;
  flex-shrink:0;
}
.site-logo .icon{font-size:1.3rem}
.site-logo span{color:var(--c-brand)}

/* 搜索 */
.search-wrap{position:relative;width:300px;max-width:100%}
.search-wrap input{
  width:100%;height:38px;padding:0 16px 0 38px;border:1px solid var(--c-border);
  border-radius:20px;font-size:.875rem;background:var(--c-bg);color:var(--c-text);
  outline:none;transition:border-color .2s,box-shadow .2s;
}
.search-wrap input:focus{border-color:var(--c-brand);box-shadow:0 0 0 3px rgba(79,110,247,.10)}
.search-wrap input::placeholder{color:var(--c-text-muted)}
.search-wrap .search-icon{
  position:absolute;left:13px;top:50%;transform:translateY(-50%);
  color:var(--c-text-muted);font-size:.95rem;pointer-events:none;
}

/* ----- 页面主体 ----- */
.main{max-width:var(--max-w);margin:0 auto;padding:32px 24px 80px}

/* ----- 首页 Hero ----- */
.hero{text-align:center;padding:16px 0 8px}
.hero h1{font-size:1.65rem;font-weight:700;letter-spacing:-.01em}
.hero p{color:var(--c-text-secondary);margin-top:6px;font-size:.92rem}

/* 分类导航 pills */
.cat-nav{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px;justify-content:center}
.cat-nav button{
  font-size:.8rem;padding:5px 16px;border-radius:16px;cursor:pointer;
  background:#fff;border:1px solid var(--c-border);color:var(--c-text-secondary);
  transition:all .18s;user-select:none;
}
.cat-nav button:hover{background:var(--c-brand-light);border-color:var(--c-brand);color:var(--c-brand)}
.cat-nav button.active{background:var(--c-brand);border-color:var(--c-brand);color:#fff}

/* 统计 */
.stats-bar{
  display:flex;gap:28px;justify-content:center;flex-wrap:wrap;
  margin-top:18px;font-size:.84rem;color:var(--c-text-secondary);
}
.stats-bar strong{color:var(--c-brand);font-size:1.15rem;font-weight:700}

/* ----- 分类区块 ----- */
.cat-section{margin-top:36px}
.cat-section.empty,.cat-section.hidden{display:none}
.cat-title{
  font-size:1rem;font-weight:600;margin-bottom:14px;padding-left:8px;
  border-left:3px solid var(--c-brand);display:flex;align-items:center;gap:8px;
}
.cat-count{font-size:.78rem;font-weight:400;color:var(--c-text-muted)}

/* ----- 工具卡片网格 ----- */
.tool-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:var(--gap)}
.tool-card{
  background:var(--c-card);border:1px solid var(--c-border);
  border-radius:var(--radius);padding:18px 16px;box-shadow:var(--shadow-sm);
  transition:box-shadow .22s,transform .22s,border-color .22s;
  cursor:pointer;display:flex;flex-direction:column;gap:8px;
  position:relative;overflow:hidden;
}
.tool-card::before{
  content:'';position:absolute;top:0;left:0;right:0;height:3px;
  background:var(--c-brand);opacity:0;transition:opacity .22s;
}
.tool-card:hover{
  box-shadow:var(--shadow-lg);transform:translateY(-2px);border-color:#cbd5e1;
}
.tool-card:hover::before{opacity:1}
.tool-card .tool-name{font-size:.95rem;font-weight:600;color:var(--c-text)}
.tool-card .tool-desc{font-size:.8rem;color:var(--c-text-secondary);line-height:1.5;flex:1}
.tool-card .tool-meta{display:flex;align-items:center;gap:8px;margin-top:auto}
.tool-card .tool-icon{font-size:1.4rem;line-height:1}
.tool-card .tool-tag{
  font-size:.7rem;color:var(--c-tag-text);background:var(--c-tag-bg);
  padding:2px 10px;border-radius:10px;
}

/* 空状态 */
.no-result{text-align:center;padding:80px 20px;color:var(--c-text-muted)}
.no-result .icon{font-size:3.5rem;display:block;margin-bottom:16px;opacity:.6}
.no-result p{font-size:.95rem}

/* ----- 页脚 ----- */
.site-footer{
  text-align:center;padding:24px;color:var(--c-text-muted);
  font-size:.78rem;border-top:1px solid var(--c-border);
}

/* ============================================================
   工具页 通用
   ============================================================ */
.tool-page{max-width:860px;margin:0 auto}

.back-link{
  display:inline-flex;align-items:center;gap:4px;font-size:.88rem;
  color:var(--c-brand);margin-bottom:20px;padding:4px 10px 4px 6px;
  border-radius:var(--radius-sm);transition:background .15s;
}
.back-link:hover{background:var(--c-brand-light)}

.tool-page-header{margin-bottom:24px}
.tool-page-header h1{font-size:1.35rem;font-weight:700}
.tool-page-header p{color:var(--c-text-secondary);font-size:.86rem;margin-top:4px}

.tool-panel{
  background:var(--c-card);border:1px solid var(--c-border);
  border-radius:var(--radius-lg);padding:24px;box-shadow:var(--shadow);
}

/* 表单 */
label{font-weight:600;font-size:.84rem;display:block;margin-bottom:4px;color:var(--c-text)}
textarea,input[type="text"],input[type="url"],input[type="number"],select{
  width:100%;padding:9px 13px;font-size:.88rem;border:1px solid var(--c-border);
  border-radius:var(--radius-sm);background:var(--c-bg);color:var(--c-text);
  outline:none;transition:border-color .2s,box-shadow .2s;
  font-family:"SF Mono","Fira Code","Consolas","Menlo",monospace;
}
input[type="number"]{font-family:inherit}
textarea{min-height:150px;resize:vertical;line-height:1.55}
textarea:focus,input[type="text"]:focus,input[type="url"]:focus,input[type="number"]:focus,select:focus{
  border-color:var(--c-brand);box-shadow:0 0 0 3px rgba(79,110,247,.08);
}
input[type="checkbox"],input[type="radio"]{
  width:16px;height:16px;accent-color:var(--c-brand);cursor:pointer
}
input[type="color"]{
  width:34px;height:34px;padding:2px;border:1px solid var(--c-border);
  border-radius:var(--radius-sm);cursor:pointer;background:#fff
}
input[type="datetime-local"]{font-family:inherit}
select{cursor:pointer;font-family:inherit}

/* 按钮 */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:6px;
  padding:9px 20px;font-size:.875rem;font-weight:600;border:none;
  border-radius:var(--radius-sm);cursor:pointer;transition:all .15s;
  white-space:nowrap;user-select:none;
}
.btn:active{transform:scale(.97)}
.btn:disabled{opacity:.5;cursor:not-allowed;transform:none}
.btn-primary{background:var(--c-brand);color:#fff}
.btn-primary:hover{background:var(--c-brand-hover)}
.btn-secondary{background:var(--c-bg);color:var(--c-text);border:1px solid var(--c-border)}
.btn-secondary:hover{background:var(--c-border)}
.btn-sm{padding:6px 13px;font-size:.8rem}
.btn-xs{padding:4px 10px;font-size:.75rem}
.btn-row{display:flex;gap:8px;flex-wrap:wrap;margin-top:14px;align-items:center}

/* Toast */
.toast{
  position:fixed;top:80px;left:50%;transform:translateX(-50%);
  background:#1e293b;color:#fff;padding:9px 22px;border-radius:20px;
  font-size:.84rem;z-index:9999;opacity:0;transition:opacity .25s;
  pointer-events:none;box-shadow:0 4px 16px rgba(0,0,0,.15);
}
.toast.show{opacity:1}

/* 分割线 */
hr.divider{border:none;border-top:1px solid var(--c-border);margin:24px 0}

/* 结果输出区 */
.result-box{
  margin-top:14px;padding:14px;background:#f8fafc;border:1px solid var(--c-border);
  border-radius:var(--radius-sm);font-family:"SF Mono","Fira Code","Consolas","Menlo",monospace;
  font-size:.84rem;white-space:pre-wrap;word-break:break-all;
  max-height:320px;overflow-y:auto;line-height:1.55;
}
.result-box.ok{border-color:var(--c-success);background:#f0fdf4}
.result-box.err{border-color:var(--c-danger);background:#fef2f2;color:#991b1b}

.inline-flex{display:inline-flex;align-items:center;gap:6px}
.flex-between{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:8px}
.text-xs{font-size:.76rem}
.text-sm{font-size:.82rem}
.text-muted{color:var(--c-text-secondary)}
.mt-2{margin-top:8px}
.mt-3{margin-top:14px}
.mt-4{margin-top:20px}
.mb-2{margin-bottom:8px}
.gap-2{gap:8px}
.gap-3{gap:12px}

/* 卡片统计 */
.stat-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(110px,1fr));gap:10px}
.stat-card{
  background:var(--c-bg);border-radius:var(--radius-sm);padding:14px 12px;
  text-align:center;transition:background .15s;
}
.stat-card .num{font-size:1.5rem;font-weight:700;color:var(--c-brand)}
.stat-card .label{font-size:.74rem;color:var(--c-text-muted);margin-top:2px}

/* 响应式 */
@media(max-width:960px){.tool-grid{grid-template-columns:repeat(3,1fr)}}
@media(max-width:680px){
  .tool-grid{grid-template-columns:repeat(2,1fr);gap:12px}
  .tool-card{padding:14px 12px}
  .hero h1{font-size:1.35rem}
  .site-logo{font-size:1rem}
  .main{padding:24px 16px 60px}
  .tool-panel{padding:16px}
  .stat-cards{grid-template-columns:repeat(3,1fr)}
}
@media(max-width:420px){
  .tool-grid{grid-template-columns:1fr}
  .site-header .inner{padding:0 14px}
  .search-wrap{flex:1}
  .stat-cards{grid-template-columns:repeat(2,1fr)}
}