:root{
  --bg:#07070a;--surface:rgba(255,255,255,.035);--surface-2:rgba(255,255,255,.012);
  --border:rgba(255,255,255,.08);--border-strong:rgba(255,255,255,.14);
  --text:#f4f4f7;--muted:#9b9baa;--muted-2:#6e6e80;
  --accent:#7c5cff;--accent-2:#b18cff;--accent-3:#4fd1c5;
  --glow:rgba(124,92,255,.35);--maxw:1080px;
  --font:'Inter',system-ui,-apple-system,'Segoe UI',Roboto,sans-serif;
  --mono:'JetBrains Mono',ui-monospace,Menlo,monospace;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--text);font-family:var(--font);-webkit-font-smoothing:antialiased;line-height:1.6;min-height:100vh;display:flex;flex-direction:column;overflow-x:hidden}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font-family:inherit;color:inherit}
button{cursor:pointer;border:none;background:none}

.bg{position:fixed;inset:0;pointer-events:none;z-index:0;overflow:hidden}
.bg::before{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.028) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.028) 1px,transparent 1px);background-size:64px 64px;mask-image:radial-gradient(ellipse 90% 55% at 50% 0%,#000 20%,transparent 75%);-webkit-mask-image:radial-gradient(ellipse 90% 55% at 50% 0%,#000 20%,transparent 75%)}
.orb{position:absolute;border-radius:50%;filter:blur(110px);opacity:.4}
.orb-1{width:600px;height:600px;background:radial-gradient(circle,rgba(124,92,255,.5),transparent 65%);top:-280px;left:50%;transform:translateX(-50%)}
.orb-2{width:400px;height:400px;background:radial-gradient(circle,rgba(79,209,197,.2),transparent 65%);top:400px;right:-200px}

header{position:sticky;top:0;z-index:100;backdrop-filter:blur(14px);background:rgba(7,7,10,.72);border-bottom:1px solid transparent;transition:.3s}
header.scrolled{border-bottom-color:var(--border);background:rgba(7,7,10,.9)}
.wrap{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 22px;position:relative;z-index:1}
.nav{display:flex;align-items:center;justify-content:space-between;height:62px;gap:14px}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:15px;letter-spacing:-.02em;flex:none}
.logo-mark{width:26px;height:26px;border-radius:8px;display:grid;place-items:center;background:linear-gradient(140deg,var(--accent),#4a2fd6);box-shadow:0 0 20px var(--glow);flex:none}
.logo-mark svg{width:14px;height:14px}
.nav-right{display:flex;align-items:center;gap:10px;flex:none}

/* 语言切换：链接形式 */
.lang-switch{display:flex;align-items:center;gap:2px;padding:3px;border:1px solid var(--border-strong);border-radius:9px;background:rgba(255,255,255,.02)}
.lang-switch a{font-size:12px;font-weight:700;letter-spacing:.04em;color:var(--muted-2);padding:5px 9px;border-radius:6px;transition:.2s;text-transform:uppercase}
.lang-switch a:hover{color:var(--text);background:rgba(255,255,255,.05)}
.lang-switch a.active{color:#fff;background:rgba(124,92,255,.28);box-shadow:0 0 0 1px rgba(124,92,255,.4) inset}

.back{font-size:13.5px;color:var(--muted);display:inline-flex;align-items:center;gap:6px;transition:color .2s}
.back:hover{color:var(--text)}

main{flex:1;position:relative;z-index:1;padding:44px 0 60px}
.tool-page h1{font-size:clamp(24px,3.4vw,34px);line-height:1.2;letter-spacing:-.03em;font-weight:800;margin-bottom:10px}
.tool-page .lead{color:var(--muted);font-size:14.5px;margin-bottom:28px;max-width:560px}

.card{background:linear-gradient(180deg,var(--surface),var(--surface-2));border:1px solid var(--border);border-radius:16px;padding:24px;margin-bottom:18px}

label{display:block;font-size:13px;font-weight:600;color:var(--muted);margin-bottom:8px}
input[type=text],input[type=number],input[type=email],input[type=date],textarea,select{width:100%;background:rgba(255,255,255,.03);border:1px solid var(--border-strong);border-radius:10px;padding:12px 16px;font-size:14.5px;color:var(--text);outline:none;transition:.2s;font-family:inherit}
input:focus,textarea:focus,select:focus{border-color:rgba(124,92,255,.5);background:rgba(124,92,255,.05);box-shadow:0 0 0 4px rgba(124,92,255,.1)}
input[type=range]{width:100%;accent-color:var(--accent);height:6px;background:rgba(255,255,255,.08);border-radius:3px;outline:none;-webkit-appearance:none;margin:8px 0}
input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:20px;height:20px;background:linear-gradient(180deg,#8a6bff,var(--accent));border-radius:50%;cursor:pointer;box-shadow:0 0 0 4px rgba(124,92,255,.2)}
input[type=checkbox]{width:18px;height:18px;accent-color:var(--accent);cursor:pointer}
textarea{resize:vertical;min-height:140px;line-height:1.6;font-family:var(--mono);font-size:13.5px}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-size:14px;font-weight:600;border-radius:10px;padding:12px 22px;transition:.18s;white-space:nowrap;cursor:pointer}
.btn-primary{background:linear-gradient(180deg,#8a6bff,var(--accent));color:#fff;box-shadow:0 1px 0 rgba(255,255,255,.22) inset,0 8px 28px -8px var(--glow)}
.btn-primary:hover{transform:translateY(-1.5px)}
.btn-ghost{border:1px solid var(--border-strong);color:var(--text);background:rgba(255,255,255,.02)}
.btn-ghost:hover{background:rgba(255,255,255,.06)}
.btn-block{width:100%}
.btn-row{display:flex;gap:10px;flex-wrap:wrap;margin-top:22px}

.result{background:rgba(124,92,255,.08);border:1px solid rgba(124,92,255,.25);border-radius:12px;padding:20px;margin-top:18px}
.result-label{font-size:11.5px;color:var(--muted-2);text-transform:uppercase;letter-spacing:.08em;font-weight:600;margin-bottom:10px}
.result-value{font-size:clamp(20px,3vw,28px);font-weight:800;letter-spacing:-.03em;font-family:var(--mono);word-break:break-all;line-height:1.4}
.result-note{font-size:13px;color:var(--muted);margin-top:8px;line-height:1.6}

.grid2{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.grid4{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.check-row{display:flex;align-items:center;gap:10px;font-size:14px;color:var(--text);font-weight:500;cursor:pointer;padding:10px 14px;border:1px solid var(--border);border-radius:10px;background:rgba(255,255,255,.02);transition:.2s}
.check-row:hover{border-color:var(--border-strong)}
.hint{font-size:12.5px;color:var(--muted-2);margin-top:10px;line-height:1.6}

/* 计算器 */
.calc-display{background:rgba(0,0,0,.3);border:1px solid var(--border-strong);border-radius:12px;padding:22px 20px;margin-bottom:14px;text-align:right}
.calc-display .expr{font-family:var(--mono);font-size:14px;color:var(--muted-2);min-height:20px;word-break:break-all}
.calc-display .val{font-family:var(--mono);font-size:38px;font-weight:700;color:var(--text);letter-spacing:-.02em;word-break:break-all;line-height:1.2}
.calc-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}
.calc-btn{font-family:var(--mono);font-size:18px;font-weight:600;padding:18px 0;border-radius:11px;background:rgba(255,255,255,.04);border:1px solid var(--border);color:var(--text);transition:.15s;cursor:pointer}
.calc-btn:hover{background:rgba(255,255,255,.08);border-color:var(--border-strong)}
.calc-btn.op{color:var(--accent-2)}
.calc-btn.eq{background:linear-gradient(180deg,#8a6bff,var(--accent));border-color:transparent;color:#fff;grid-column:span 2}
.calc-btn.wide{grid-column:span 2}

/* 目录页 */
.hero{padding:64px 0 32px;text-align:center}
.badge{display:inline-flex;align-items:center;gap:8px;padding:6px 14px;border-radius:999px;border:1px solid var(--border-strong);background:rgba(255,255,255,.035);font-size:12.5px;color:var(--muted);font-weight:500;margin-bottom:22px}
.badge i{width:6px;height:6px;border-radius:50%;background:var(--accent-3);display:block;box-shadow:0 0 10px var(--accent-3)}
.hero h1{font-size:clamp(28px,4.4vw,46px);line-height:1.2;letter-spacing:-.03em;font-weight:800;max-width:820px;margin:0 auto}
.grad{background:linear-gradient(105deg,#c4b1ff,#7c5cff 45%,#4fd1c5);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero .sub{font-size:clamp(14px,1.6vw,16px);color:var(--muted);max-width:640px;margin:18px auto 0;line-height:1.7}

.search{max-width:520px;margin:30px auto 0;position:relative}
.search svg{position:absolute;left:18px;top:50%;transform:translateY(-50%);width:17px;height:17px;color:var(--muted-2);pointer-events:none}
.search input{width:100%;background:rgba(255,255,255,.035);border:1px solid var(--border-strong);border-radius:12px;padding:14px 18px 14px 48px;font-size:14.5px;color:var(--text);outline:none;transition:.2s}
.search input:focus{border-color:rgba(124,92,255,.5);background:rgba(124,92,255,.05);box-shadow:0 0 0 4px rgba(124,92,255,.1)}

.tabs{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;margin-top:26px}
.tab{font-size:13.5px;font-weight:600;color:var(--muted);padding:9px 18px;border-radius:10px;border:1px solid var(--border);background:rgba(255,255,255,.02);transition:.2s;cursor:pointer;display:inline-flex;align-items:center;gap:7px}
.tab:hover{color:var(--text);border-color:var(--border-strong);background:rgba(255,255,255,.05)}
.tab.active{color:#fff;background:linear-gradient(180deg,#8a6bff,var(--accent));border-color:transparent;box-shadow:0 1px 0 rgba(255,255,255,.2) inset,0 6px 20px -6px var(--glow)}

.tools-section{padding:40px 0 64px}
.tool-group{margin-bottom:40px}
.group-head{display:flex;align-items:center;gap:12px;margin-bottom:18px;padding-bottom:14px;border-bottom:1px solid var(--border)}
.group-head .g-icon{width:30px;height:30px;border-radius:9px;display:grid;place-items:center;background:rgba(124,92,255,.12);border:1px solid rgba(124,92,255,.25);flex:none}
.group-head .g-icon svg{width:15px;height:15px;color:var(--accent-2)}
.group-head h2{font-size:16.5px;font-weight:700;letter-spacing:-.015em}
.group-head .g-sub{font-size:12.5px;color:var(--muted-2);margin-left:auto;font-weight:500}
.tools{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.tool{display:flex;flex-direction:column;gap:12px;background:linear-gradient(180deg,var(--surface),rgba(255,255,255,.012));border:1px solid var(--border);border-radius:14px;padding:20px 18px;transition:border-color .25s,transform .25s,background .25s;position:relative;overflow:hidden;cursor:pointer}
.tool:hover{border-color:var(--border-strong);transform:translateY(-3px);background:rgba(124,92,255,.04)}
.tool-icon{width:40px;height:40px;border-radius:11px;display:grid;place-items:center;flex:none;background:linear-gradient(150deg,rgba(124,92,255,.18),rgba(124,92,255,.05));border:1px solid rgba(124,92,255,.25)}
.tool-icon svg{width:19px;height:19px;color:var(--accent-2)}
.tool-body{flex:1}
.tool h3{font-size:14.5px;font-weight:650;letter-spacing:-.01em;margin-bottom:5px;line-height:1.35}
.tool p{font-size:12.5px;color:var(--muted-2);line-height:1.55}
.tool-arrow{position:absolute;top:18px;right:16px;color:var(--muted-2);transition:transform .3s,color .3s}
.tool-arrow svg{width:15px;height:15px}
.tool:hover .tool-arrow{color:var(--accent-2);transform:translate(3px,-3px)}

footer{border-top:1px solid var(--border);padding:26px 0;position:relative;z-index:1;margin-top:auto}
.foot{display:flex;justify-content:space-between;align-items:center;gap:18px;flex-wrap:wrap;font-size:12.5px;color:var(--muted-2)}
.foot-links{display:flex;gap:20px;flex-wrap:wrap}
.foot-links a:hover{color:var(--text)}

.toast{position:fixed;left:50%;bottom:28px;transform:translate(-50%,140%);background:rgba(20,20,28,.96);border:1px solid var(--border-strong);color:var(--text);font-size:13.5px;font-weight:600;padding:12px 22px;border-radius:11px;box-shadow:0 20px 50px -12px rgba(0,0,0,.85);transition:transform .4s cubic-bezier(.2,.8,.2,1);z-index:999;display:flex;align-items:center;gap:8px}
.toast.show{transform:translate(-50%,0)}
.toast svg{width:15px;height:15px;color:var(--accent-3)}

@media(max-width:1000px){.tools{grid-template-columns:repeat(3,1fr)}}
@media(max-width:760px){
  .tools{grid-template-columns:repeat(2,1fr)}
  .card{padding:20px}
  .grid2,.grid3,.grid4{grid-template-columns:1fr}
  .group-head .g-sub{display:none}
}
@media(max-width:520px){
  .hero{padding:44px 0 24px}
  .tools{grid-template-columns:1fr}
  .tools-section{padding:28px 0 48px}
  main{padding:32px 0 48px}
  .foot{flex-direction:column;text-align:center}
}

/* SEO content + FAQ blocks (used by ja tool pages) */
.seo-content{max-width:860px;margin:56px auto 0;color:var(--muted)}
.seo-content h2{font-size:22px;color:var(--text);margin:0 0 14px;letter-spacing:-.01em}
.seo-content>h3{font-size:15.5px;color:var(--text);margin:26px 0 10px}
.seo-content p{font-size:14.5px;line-height:1.75;margin:0 0 12px}
.seo-content ul{margin:0 0 12px;padding-left:20px;font-size:14.5px;line-height:1.8}
.seo-content li{margin-bottom:6px}
.faq-item{border:1px solid var(--border);border-radius:12px;padding:16px 18px;margin:12px 0;background:rgba(255,255,255,.02)}
.faq-item h3{margin:0 0 8px;font-size:15px;color:var(--text)}
.faq-item p{margin:0;font-size:14px;line-height:1.7;color:var(--muted)}
@media(max-width:720px){.seo-content{margin-top:40px}}

/* Related Tools */
.related-tools{margin-top:56px;padding-top:32px;border-top:1px solid var(--border)}
.related-tools h2{font-size:20px;font-weight:700;letter-spacing:-.02em;margin-bottom:20px}
.related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.related-card{display:flex;align-items:center;gap:14px;padding:16px 18px;background:linear-gradient(180deg,var(--surface),var(--surface-2));border:1px solid var(--border);border-radius:12px;transition:border-color .25s,transform .25s,background .25s}
.related-card:hover{border-color:var(--border-strong);transform:translateY(-2px);background:rgba(124,92,255,.04)}
.related-card .r-icon{width:36px;height:36px;border-radius:10px;flex:none;display:grid;place-items:center;background:linear-gradient(150deg,rgba(124,92,255,.18),rgba(124,92,255,.05));border:1px solid rgba(124,92,255,.25)}
.related-card .r-icon svg{width:17px;height:17px;color:var(--accent-2)}
.related-card b{display:block;font-size:14px;font-weight:650;letter-spacing:-.01em;line-height:1.3}
.related-card span{font-size:12px;color:var(--muted-2);display:block;margin-top:2px;line-height:1.4}
@media(max-width:760px){.related-grid{grid-template-columns:1fr 1fr}}
@media(max-width:520px){.related-grid{grid-template-columns:1fr}}

/* RTL 支持（阿拉伯语） */
[dir="rtl"] body{font-family:'Noto Sans Arabic','Cairo',system-ui,sans-serif}
[dir="rtl"] .nav{flex-direction:row-reverse}
[dir="rtl"] .nav-right{flex-direction:row-reverse}
[dir="rtl"] .logo{flex-direction:row-reverse}
[dir="rtl"] .lang-switch{flex-direction:row-reverse}
[dir="rtl"] .tool-arrow{right:auto;left:16px}
[dir="rtl"] .tool:hover .tool-arrow{transform:translate(-3px,-3px)}
[dir="rtl"] .back svg,[dir="rtl"] .related-card .r-icon svg,[dir="rtl"] .related-tools .r-icon svg{transform:scaleX(-1)}
[dir="rtl"] .tool-icon,[dir="rtl"] .ico,[dir="rtl"] .g-icon{margin-right:0;margin-left:12px}
[dir="rtl"] .card,[dir="rtl"] .tool,[dir="rtl"] .related-card{text-align:right}
[dir="rtl"] .hero,[dir="rtl"] .sec-head,[dir="rtl"] .tool-header{text-align:center}
[dir="rtl"] .field label,[dir="rtl"] label{text-align:right}
[dir="rtl"] input,[dir="rtl"] textarea,[dir="rtl"] select{text-align:right;direction:rtl}
[dir="rtl"] input[type=number],[dir="rtl"] .result-value,[dir="rtl"] .stat-num,[dir="rtl"] .clock-item .time{direction:ltr;text-align:left}
[dir="rtl"] .check-row{flex-direction:row-reverse}
[dir="rtl"] .stat-box,[dir="rtl"] .calc-display{text-align:center}
[dir="rtl"] .pw-output{direction:ltr;text-align:left}
[dir="rtl"] .foot{flex-direction:row-reverse}
[dir="rtl"] .foot-links{flex-direction:row-reverse}
[dir="rtl"] .search svg{left:auto;right:18px}
[dir="rtl"] .search input{padding:14px 48px 14px 18px}
[dir="rtl"] .group-head .g-sub{margin-left:0;margin-right:auto}