:root{--bg:#f5f6fa;--surface:#fff;--border:#e4e6f0;--text:#1a1a2e;--muted:#777;--accent:#4361ee;--accent2:#3a0ca3;--hover:rgba(67,97,238,.08);--radius:10px;--shadow:0 2px 12px rgba(0,0,0,.06)}
[data-theme=dark]{--bg:#0f0f1a;--surface:#1a1a2e;--border:#2a2a40;--text:#e4e6f0;--muted:#888;--hover:rgba(67,97,238,.15);--shadow:0 2px 12px rgba(0,0,0,.3)}
*{margin:0;padding:0;box-sizing:border-box;scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;line-height:1.6;color:var(--text);background:var(--bg);transition:background .2s,color .2s}
a{color:var(--accent);text-decoration:none;transition:color .15s}
a:hover{color:var(--accent2)}
nav{display:flex;justify-content:space-between;align-items:center;max-width:1100px;margin:0 auto;padding:.8rem 1rem}
.logo{font-size:1.4rem;font-weight:800;color:var(--text);text-decoration:none;display:flex;align-items:center;gap:.3rem}
.logo span{color:var(--accent)}
.nav-right{display:flex;align-items:center;gap:1.2rem}
.nav-links{display:flex;gap:1rem}
.nav-links>a,.nav-dd{color:var(--muted);font-size:.88rem;font-weight:500;transition:color .15s;padding:.2rem 0;border-bottom:2px solid transparent;position:relative;cursor:pointer}
.nav-links>a:hover,.nav-links>a.active,.nav-dd:hover{color:var(--accent);border-color:var(--accent)}
.nav-dd-menu{display:none;position:absolute;top:100%;left:0;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:.4rem 0;min-width:200px;box-shadow:var(--shadow);z-index:50;margin-top:.3rem}
.nav-dd:hover .nav-dd-menu{display:block}
.nav-dd-menu a{display:block;padding:.4rem .8rem;color:var(--text);font-size:.84rem;font-weight:400;text-decoration:none;border:none;white-space:nowrap}
.nav-dd-menu a:hover{background:var(--hover);color:var(--accent)}
.theme-toggle{background:none;border:1px solid var(--border);border-radius:99px;padding:.3rem .6rem;cursor:pointer;font-size:.85rem;color:var(--muted);transition:all .15s}
.theme-toggle:hover{border-color:var(--accent);color:var(--accent)}
.hero{text-align:center;padding:2.5rem 1rem 2rem;background:linear-gradient(135deg,var(--accent),var(--accent2));color:#fff}
.hero h2{font-size:1.9rem;font-weight:800;margin-bottom:.3rem}
.hero p{opacity:.9;max-width:480px;margin:0 auto;font-size:.95rem}
.hero .kbd{display:inline-block;background:rgba(255,255,255,.2);padding:.1rem .5rem;border-radius:4px;font-size:.8rem;margin-top:.6rem;font-family:monospace}
main{max-width:1100px;margin:0 auto;padding:1.2rem 1rem}
.section-title{font-size:.75rem;text-transform:uppercase;letter-spacing:.12em;color:var(--accent);font-weight:700;margin:1.8rem 0 .6rem;display:flex;align-items:center;gap:.5rem}
.section-title::before{content:'';width:3px;height:1em;background:var(--accent);border-radius:2px}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:1rem;margin-bottom:1.5rem}
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1.3rem;text-align:center;text-decoration:none;color:inherit;transition:all .2s;position:relative;overflow:hidden}
.card::after{content:'→';position:absolute;bottom:.8rem;right:.8rem;opacity:0;transition:all .2s;color:var(--accent);font-weight:700}
.card:hover{box-shadow:var(--shadow);transform:translateY(-3px);border-color:var(--accent);color:inherit}
.card:hover::after{opacity:1}
.card .icon{font-size:1.8rem;margin-bottom:.4rem;transition:transform .2s}
.card:hover .icon{transform:scale(1.15)}
.card h3{font-size:1rem;margin-bottom:.2rem}
.card p{font-size:.82rem;color:var(--muted)}
.tool-page{max-width:900px;margin:0 auto;padding:1.2rem 1rem}
.tool-page h1{font-size:1.5rem;font-weight:800;margin-bottom:.8rem}
.tool-tabs{display:flex;flex-wrap:wrap;gap:.4rem;margin-bottom:1.2rem}
.tool-tabs button{padding:.4rem .8rem;background:var(--bg);color:var(--muted);border:1px solid var(--border);border-radius:99px;font-size:.8rem;font-weight:600;cursor:pointer;transition:all .15s}
.tool-tabs button:hover{border-color:var(--accent);color:var(--accent)}
.tool-tabs button.active{background:var(--accent);color:#fff;border-color:var(--accent)}
.tool-box{display:none}
.tool-box.visible{display:block;animation:fadeIn .25s ease}
@keyframes fadeIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}
.tool-grid{display:grid;gap:1.2rem}
.tool-box{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1.3rem;transition:border-color .15s}
.tool-box:target{border-color:var(--accent);box-shadow:var(--shadow)}
.tool-box h2{font-size:1rem;margin-bottom:.6rem;display:flex;align-items:center;gap:.4rem}
label{display:block;font-size:.82rem;color:var(--muted);margin-bottom:.1rem;font-weight:500}
textarea,input[type=text],input[type=number],input[type=email],select{width:100%;padding:.55rem .75rem;border:1px solid var(--border);border-radius:8px;font-size:.9rem;font-family:inherit;margin-bottom:.5rem;background:var(--bg);color:var(--text);transition:border-color .15s}
textarea:focus,input:focus,select:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px rgba(67,97,238,.1)}
textarea{min-height:100px;font-family:'SF Mono',Monaco,Consolas,monospace;font-size:.82rem;resize:vertical}
.output{background:var(--bg);border:1px solid var(--border);border-radius:8px;padding:.7rem;font-family:'SF Mono',Monaco,Consolas,monospace;font-size:.82rem;white-space:pre-wrap;word-break:break-all;min-height:50px;max-height:280px;overflow:auto;transition:all .15s}
button{padding:.5rem 1.1rem;background:var(--accent);color:#fff;border:none;border-radius:8px;font-weight:600;cursor:pointer;font-size:.85rem;transition:all .15s;margin:.2rem .2rem .2rem 0}
button:hover{background:var(--accent2);transform:translateY(-1px);box-shadow:0 4px 12px rgba(67,97,238,.25)}
button:active{transform:translateY(0);box-shadow:none}
button.secondary{background:var(--bg);color:var(--muted);border:1px solid var(--border)}
button.secondary:hover{border-color:var(--accent);color:var(--accent);background:var(--hover)}
.btn-row{display:flex;flex-wrap:wrap;gap:.2rem;margin:.4rem 0}
.result{font-size:1.7rem;font-weight:800;color:var(--accent);margin:.4rem 0}
.result-label{font-size:.82rem;color:var(--muted)}
.result-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:.8rem;margin:.6rem 0}
.result-item{text-align:center;padding:.7rem;background:var(--bg);border-radius:8px;border:1px solid var(--border)}
.result-item .val{font-size:1.2rem;font-weight:700;color:var(--text)}
.result-item .lbl{font-size:.72rem;color:var(--muted)}
.ad-slot{margin:1.5rem 0;min-height:1px;text-align:center}
.newsletter{text-align:center;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1.5rem 1rem;margin:1.5rem 0}
.newsletter h2{font-size:1.1rem;margin-bottom:.2rem}
.newsletter p{color:var(--muted);margin-bottom:.7rem;font-size:.88rem}
.newsletter form{display:flex;gap:.4rem;max-width:380px;margin:0 auto}
.newsletter button{padding:.55rem 1.2rem}
.toast{position:fixed;bottom:1.5rem;right:1.5rem;background:var(--accent);color:#fff;padding:.6rem 1.2rem;border-radius:8px;font-size:.85rem;font-weight:600;opacity:0;transform:translateY(10px);transition:all .25s;pointer-events:none;z-index:99}
.toast.show{opacity:1;transform:translateY(0)}
.scroll-top{position:fixed;bottom:1.5rem;left:1.5rem;background:var(--accent);color:#fff;border:none;width:40px;height:40px;border-radius:50%;font-size:1.2rem;cursor:pointer;opacity:0;transition:all .2s;z-index:50;display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow)}
.scroll-top.show{opacity:1}
.scroll-top:hover{transform:translateY(-2px);background:var(--accent2)}
.share-btn{display:inline-flex;align-items:center;gap:.3rem;padding:.3rem .7rem;background:var(--bg);border:1px solid var(--border);border-radius:6px;font-size:.75rem;color:var(--muted);cursor:pointer;transition:all .15s;float:right}
.share-btn:hover{border-color:var(--accent);color:var(--accent)}
.tool-tabs button{position:relative}
.tool-tabs button.active::after{content:'';position:absolute;bottom:-2px;left:25%;right:25%;height:2px;background:var(--accent);border-radius:2px}
footer{max-width:1100px;margin:2rem auto 0;padding:1rem;border-top:1px solid var(--border);display:flex;justify-content:space-between;font-size:.8rem;color:var(--muted)}
footer a{color:var(--muted);margin-left:.7rem}
footer a:hover{color:var(--accent)}
@media(max-width:600px){.hero h2{font-size:1.4rem}.cards{grid-template-columns:1fr 1fr}.result-grid{grid-template-columns:1fr 1fr}.newsletter form{flex-direction:column}nav{flex-wrap:wrap;gap:.4rem}.nav-links{gap:.5rem;flex-wrap:wrap}.nav-dd-menu{position:fixed;left:1rem;right:1rem;top:auto}footer{flex-direction:column;gap:.4rem;text-align:center}.tool-tabs{gap:.3rem}.tool-tabs button{font-size:.72rem;padding:.3rem .6rem}.share-btn{float:none;margin-top:.3rem}}