:root{--color-bg: #f7f7fb;--color-surface: #ffffff;--color-border: #e7e7ee;--color-text: #1c1c28;--color-muted: #6b6b7b;--color-primary: #4f46e5;--color-primary-hover: #4338ca;--color-primary-soft: #eef0ff;--color-success: #0f9d58;--color-danger: #d93025;--radius: 14px;--radius-sm: 10px;--shadow-sm: 0 1px 2px rgba(20, 20, 40, .04), 0 1px 3px rgba(20, 20, 40, .06);--shadow-md: 0 4px 16px rgba(20, 20, 40, .08);--font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;--maxw: 960px}@media(prefers-color-scheme:dark){:root{--color-bg: #0f0f17;--color-surface: #1a1a25;--color-border: #2a2a3a;--color-text: #ececf2;--color-muted: #9a9aac;--color-primary: #818cf8;--color-primary-hover: #a5b0ff;--color-primary-soft: #202034;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .3);--shadow-md: 0 4px 16px rgba(0, 0, 0, .4)}}*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{margin:0;font-family:var(--font);background:var(--color-bg);color:var(--color-text);line-height:1.55;-webkit-font-smoothing:antialiased}a{color:var(--color-primary);text-decoration:none}a:hover{text-decoration:underline}h1,h2,h3{line-height:1.2;color:var(--color-text)}.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 20px}.site-header{border-bottom:1px solid var(--color-border);background:var(--color-surface);position:sticky;top:0;z-index:10}.site-header__inner{display:flex;align-items:center;justify-content:space-between;gap:12px 16px;padding:14px 20px;flex-wrap:wrap}.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:1.05rem;color:var(--color-text);flex-shrink:0}.brand:hover{text-decoration:none}.brand img{width:30px;height:30px;flex-shrink:0}.site-nav{display:flex;align-items:center;gap:14px 18px;flex-wrap:wrap}.site-nav a{color:var(--color-muted);font-size:.95rem;font-weight:500;white-space:nowrap}.site-nav a.active,.site-nav a:hover{color:var(--color-text);text-decoration:none}@media(max-width:560px){.site-header__inner{flex-direction:column;align-items:flex-start;gap:10px}.site-nav{width:100%;gap:12px 16px}.site-nav .lang-switch{margin-left:auto}}main{min-height:70vh;padding:32px 0 56px}.site-footer{border-top:1px solid var(--color-border);background:var(--color-surface);padding:28px 0;color:var(--color-muted);font-size:.9rem}.site-footer__inner{display:flex;flex-wrap:wrap;gap:8px 20px;align-items:center;justify-content:space-between}.site-footer nav{display:flex;gap:16px;flex-wrap:wrap}.hero{text-align:center;margin-bottom:28px}.hero h1{font-size:clamp(1.8rem,4vw,2.6rem);margin:0 0 10px}.hero p{color:var(--color-muted);max-width:620px;margin:0 auto;font-size:1.05rem}.section-label{font-size:.8rem;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--color-muted);margin:0 0 14px}.calc-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:18px}.calc-card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow-sm);display:flex;flex-direction:column;gap:14px}.calc-card__head{display:flex;gap:12px;align-items:flex-start}.calc-card__icon{flex:0 0 auto;width:40px;height:40px;display:grid;place-items:center;border-radius:var(--radius-sm);background:var(--color-primary-soft);color:var(--color-primary)}.calc-card__icon svg{width:22px;height:22px}.calc-card__title{margin:0;font-size:1.08rem}.calc-card__desc{margin:2px 0 0;color:var(--color-muted);font-size:.9rem}.calc-fields{display:flex;flex-direction:column;gap:12px}.field{display:flex;flex-direction:column;gap:5px}.field label{font-size:.85rem;font-weight:500;color:var(--color-muted)}.field input{font:inherit;padding:11px 12px;border:1px solid var(--color-border);border-radius:var(--radius-sm);background:var(--color-bg);color:var(--color-text);transition:border-color .15s,box-shadow .15s}.field input:focus{outline:none;border-color:var(--color-primary);box-shadow:0 0 0 3px #4f46e52e}.result{border-top:1px dashed var(--color-border);padding-top:14px;display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:56px}.result__empty{color:var(--color-muted);font-size:.9rem}.result__value{font-size:1.05rem}.result__value strong{font-size:1.5rem;color:var(--color-primary);display:inline-block}.result__sentence{color:var(--color-muted);font-size:.88rem;margin-top:2px}.copy-btn{flex:0 0 auto;font:inherit;font-size:.82rem;padding:7px 12px;border-radius:var(--radius-sm);border:1px solid var(--color-border);background:var(--color-bg);color:var(--color-text);cursor:pointer;transition:background .15s}.copy-btn:hover{background:var(--color-primary-soft)}.lang-switch{position:relative}.lang-switch select{font:inherit;font-size:.9rem;padding:7px 30px 7px 12px;border:1px solid var(--color-border);border-radius:var(--radius-sm);background:var(--color-bg);color:var(--color-text);cursor:pointer;-webkit-appearance:none;-moz-appearance:none;appearance:none}.lang-switch:after{content:"▾";position:absolute;right:11px;top:50%;transform:translateY(-50%);pointer-events:none;color:var(--color-muted);font-size:.8rem}.ad-slot{margin:28px auto;max-width:var(--maxw);min-height:90px;display:flex;align-items:center;justify-content:center;border:1px dashed var(--color-border);border-radius:var(--radius-sm);color:var(--color-muted);font-size:.75rem;letter-spacing:.08em;text-transform:uppercase;overflow:hidden}.ad-slot ins{display:block;width:100%}.prose{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow-sm)}.prose h1{margin-top:0}.prose ul{padding-left:20px}.prose code{background:var(--color-bg);padding:2px 6px;border-radius:6px;font-size:.92em}.form{display:flex;flex-direction:column;gap:16px;max-width:520px}.form textarea{font:inherit;padding:11px 12px;border:1px solid var(--color-border);border-radius:var(--radius-sm);background:var(--color-bg);color:var(--color-text);min-height:130px;resize:vertical}.form textarea:focus{outline:none;border-color:var(--color-primary);box-shadow:0 0 0 3px #4f46e52e}.btn{font:inherit;font-weight:600;padding:12px 18px;border-radius:var(--radius-sm);border:none;background:var(--color-primary);color:#fff;cursor:pointer;transition:background .15s;align-self:flex-start}.btn:hover{background:var(--color-primary-hover)}.btn:disabled{opacity:.6;cursor:not-allowed}.form-msg{font-size:.92rem;padding:10px 12px;border-radius:var(--radius-sm)}.form-msg--success{background:#0f9d581f;color:var(--color-success)}.form-msg--error{background:#d930251f;color:var(--color-danger)}.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0}