:root{--bg:#f7f8fa;--surface:#fff;--text:#1a1f2c;--muted:#5a6473;--border:#e3e7ee;--accent:#2f5bff;--accent-hover:#1e44d6;--success:#14a05f;--danger:#d6453a;--radius:10px;--shadow:0 1px 2px rgba(20,30,60,.04),0 4px 14px rgba(20,30,60,.06);--max-width:980px;--font-sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif}@media (prefers-color-scheme:dark){:root{--bg:#0f1117;--surface:#181c25;--text:#e7eaf0;--muted:#9099ad;--border:#262b38;--accent:#6f8bff;--accent-hover:#8aa0ff;--shadow:0 1px 2px rgba(0,0,0,.3),0 4px 14px rgba(0,0,0,.35)}}*{box-sizing:border-box}body,html{padding:0;margin:0;font-family:var(--font-sans);background:var(--bg);color:var(--text);font-size:16px;line-height:1.55;-webkit-font-smoothing:antialiased}a{color:var(--accent);text-decoration:none}a:hover{color:var(--accent-hover);text-decoration:underline}h1,h2,h3{line-height:1.25;margin:0 0 .5em}h1{font-size:2rem;letter-spacing:-.02em}h2{font-size:1.4rem;letter-spacing:-.01em}p{margin:0 0 1em}.container{max-width:var(--max-width);margin:0 auto;padding:0 20px}.site-header{background:var(--surface);border-bottom:1px solid var(--border);position:-webkit-sticky;position:sticky;top:0;z-index:10}.site-header .container{display:flex;align-items:center;justify-content:space-between;padding-top:14px;padding-bottom:14px}.brand{font-weight:700;font-size:1.2rem;color:var(--text);letter-spacing:-.01em}.brand-mark{display:inline-block;width:22px;height:22px;border-radius:6px;background:linear-gradient(135deg,var(--accent),#7aa1ff);margin-right:8px;vertical-align:-5px}.nav a{margin-left:18px;font-size:.95rem;color:var(--muted)}.nav a:hover{color:var(--text);text-decoration:none}main{padding:32px 0 56px;min-height:70vh}.hero{padding:24px 0 8px}.hero p.lead{font-size:1.1rem;color:var(--muted);max-width:640px}.tools-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));grid-gap:16px;gap:16px;margin-top:24px}.tool-card{display:block;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow);transition:transform .12s ease,border-color .12s ease;color:var(--text)}.tool-card:hover{border-color:var(--accent);transform:translateY(-1px);text-decoration:none;color:var(--text)}.tool-card .emoji{font-size:1.6rem;display:block;margin-bottom:8px}.tool-card h3{font-size:1.05rem;margin:0 0 4px}.tool-card p{font-size:.9rem;color:var(--muted);margin:0}.tool-page{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow);margin-top:12px}.tool-page h1{font-size:1.7rem;margin-bottom:8px}.tool-page .tool-intro{color:var(--muted);margin-bottom:24px}label{display:block;font-weight:600;font-size:.9rem;margin:14px 0 6px;color:var(--text)}input[type=date],input[type=datetime-local],input[type=number],input[type=range],input[type=text],select,textarea{width:100%;padding:10px 12px;font-size:1rem;font-family:inherit;background:var(--bg);color:var(--text);border:1px solid var(--border);border-radius:8px;transition:border-color .12s ease,box-shadow .12s ease}input:focus,select:focus,textarea:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px rgba(47,91,255,.15)}textarea{resize:vertical;min-height:140px}.row{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));grid-gap:12px;gap:12px}.button,button{display:inline-block;padding:10px 18px;font-size:.95rem;font-weight:600;font-family:inherit;background:var(--accent);color:#fff;border:0;border-radius:8px;cursor:pointer;transition:background .12s ease}.button:hover,button:hover{background:var(--accent-hover);color:#fff;text-decoration:none}button.secondary{background:transparent;color:var(--accent);border:1px solid var(--border)}button.secondary:hover{background:var(--bg);color:var(--accent)}.result{margin-top:24px;padding:18px 20px;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius)}.result .big{font-size:2rem;font-weight:700;letter-spacing:-.02em;color:var(--text);display:block;margin-bottom:4px;word-break:break-all}.result .label{color:var(--muted);font-size:.85rem;text-transform:uppercase;letter-spacing:.05em}.result-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));grid-gap:12px;gap:12px;margin-top:8px}.result-grid .cell{padding:12px 14px;background:var(--surface);border:1px solid var(--border);border-radius:8px}.result-grid .cell .label{font-size:.75rem}.result-grid .cell .big{font-size:1.3rem;margin:0}.tool-explainer{margin-top:32px;color:var(--muted);font-size:.95rem}.tool-explainer h2{color:var(--text);font-size:1.15rem;margin-top:24px}.ad-slot{margin:28px 0;text-align:center;min-height:90px}.ad-slot .placeholder{display:inline-block;padding:28px 24px;border:1px dashed var(--border);border-radius:8px;font-size:.85rem}.ad-slot .placeholder,.site-footer{color:var(--muted);background:var(--surface)}.site-footer{border-top:1px solid var(--border);padding:24px 0;margin-top:48px;font-size:.9rem}.site-footer .container{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px}.site-footer a{color:var(--muted);margin-left:14px}.site-footer a:hover{color:var(--text)}.prose{max-width:720px}.prose h2{margin-top:28px}.prose ul{padding-left:22px}@media (max-width:600px){h1{font-size:1.6rem}.tool-page{padding:20px}.nav a{margin-left:12px;font-size:.9rem}}