/* VidYTMP4 — professional design system */
:root{--blue:#2563eb;--blue-d:#1d4ed8;--navy:#0d2149;--ink:#0f172a;--body:#334155;--mut:#64748b;--line:#e2e8f0;--bg:#f7f9fc;--green:#16a34a;--radius:14px}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:'Inter',system-ui,-apple-system,'Segoe UI',Arial,sans-serif;background:var(--bg);color:var(--ink);-webkit-font-smoothing:antialiased}
a{color:var(--blue)}
:focus-visible{outline:3px solid #7dd3fc;outline-offset:2px;border-radius:4px}
/* ---------- header / nav ---------- */
header.site{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50}
.hbar{max-width:1200px;margin:0 auto;display:flex;align-items:center;gap:26px;padding:0 20px;height:66px}
.logo{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--navy);font-size:21px;font-weight:800;letter-spacing:-.02em;white-space:nowrap}
.logo .mark{width:34px;height:34px;border-radius:9px;background:linear-gradient(135deg,#2563eb,#0ea5e9);color:#fff;display:flex;align-items:center;justify-content:center;font-size:19px;font-weight:800;box-shadow:0 4px 10px rgba(37,99,235,.35)}
.logo span{color:var(--blue)}
nav.main{display:flex;align-items:center;gap:2px;margin-left:auto}
nav.main .item{position:relative}
nav.main .item>a,nav.main .plain>a{display:block;padding:10px 12px;color:#1e293b;text-decoration:none;font-size:14.5px;font-weight:600;border-radius:9px;white-space:nowrap}
nav.main .item>a::after{content:"▾";font-size:10px;margin-left:5px;color:var(--mut)}
nav.main .item:hover>a,nav.main .plain>a:hover{background:#eef4ff;color:var(--blue-d)}
.drop{position:absolute;top:calc(100% + 6px);left:0;min-width:264px;background:#fff;border:1px solid var(--line);border-radius:14px;box-shadow:0 18px 44px rgba(13,33,73,.16);padding:8px;opacity:0;visibility:hidden;transform:translateY(6px);transition:.18s ease;z-index:60}
nav.main .item:hover .drop,nav.main .item:focus-within .drop{opacity:1;visibility:visible;transform:none}
.drop a{display:flex;justify-content:space-between;gap:10px;padding:9px 11px;border-radius:9px;color:#1e293b;text-decoration:none;font-size:14px;font-weight:500}
.drop a:hover{background:#eef4ff;color:var(--blue-d)}
.drop a.all{border-top:1px solid var(--line);margin-top:6px;padding-top:11px;font-weight:700;color:var(--blue)}
.burger{display:none;margin-left:auto;background:#eef4ff;border:1px solid var(--line);border-radius:10px;width:42px;height:42px;font-size:19px;cursor:pointer;color:var(--navy)}
@media(max-width:1020px){
 .burger{display:block}
 nav.main{display:none;position:absolute;top:66px;left:0;right:0;background:#fff;flex-direction:column;align-items:stretch;padding:10px 16px 16px;border-bottom:1px solid var(--line);box-shadow:0 24px 40px rgba(13,33,73,.14);max-height:calc(100vh - 66px);overflow:auto}
 nav.main.open{display:flex}
 nav.main .item>a{padding:12px 8px;font-size:15px}
 .drop{position:static;opacity:1;visibility:visible;transform:none;box-shadow:none;border:none;border-left:3px solid #dbeafe;border-radius:0;margin:0 0 6px 8px;padding:2px 0 2px 8px}
}
/* ---------- hero ---------- */
.hero{background:linear-gradient(180deg,#e8f0fe 0%,#f2f7ff 78%,var(--bg) 100%);text-align:center;padding:58px 18px 54px;border-bottom:1px solid #dbe7f8}
.hero h1{font-size:36px;font-weight:800;letter-spacing:-.02em;color:var(--navy);margin-bottom:12px;line-height:1.18}
.hero p{color:#3f5878;font-size:16.5px;max-width:680px;margin:0 auto 26px;line-height:1.6}
.hero .kicker{display:inline-block;background:#fff;border:1px solid #c7dbfb;color:var(--blue-d);font-size:12.5px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;padding:6px 14px;border-radius:999px;margin-bottom:16px}
.pill{max-width:680px;margin:0 auto;background:#fff;border:1px solid #c9d9f6;border-radius:999px;display:flex;padding:6px;box-shadow:0 14px 34px rgba(13,33,73,.13)}
.pill input{flex:1;border:none;outline:none;font-size:16px;padding:12px 18px;border-radius:999px;min-width:0;background:transparent;color:var(--ink)}
.pill button{background:var(--blue);color:#fff;border:none;font-size:16px;font-weight:700;padding:12px 28px;border-radius:999px;cursor:pointer;transition:.15s}
.pill button:hover{background:var(--blue-d)} .pill button:disabled{opacity:.6}
.note{margin-top:14px;font-size:13px;color:var(--mut)}
.chips{margin-top:18px}.chips a{display:inline-block;background:#fff;border:1px solid #d3e0f5;color:#33507c;padding:6px 14px;border-radius:999px;font-size:13px;font-weight:600;margin:3px;text-decoration:none;transition:.15s}.chips a:hover{border-color:#2563eb;color:#2563eb;transform:translateY(-1px);box-shadow:0 4px 12px rgba(37,99,235,.15)}
.searchbar{max-width:680px;margin:24px auto 0}.searchbar input{width:100%;padding:14px 20px;border-radius:999px;border:1px solid #c9d9f6;font-size:16px;outline:none;box-shadow:0 8px 22px rgba(13,33,73,.08)}
.trustbar{display:flex;justify-content:center;gap:26px;flex-wrap:wrap;margin-top:22px;color:#33507c;font-size:13.5px;font-weight:600}
.trustbar span::before{content:"✓ ";color:var(--green);font-weight:800}
/* ---------- layout / cards ---------- */
.wrap{max-width:780px;margin:26px auto;padding:0 16px}
.toolbox{max-width:840px;margin:-26px auto 0;padding:0 16px;position:relative;z-index:2}
.toolcard{background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:0 16px 40px rgba(13,33,73,.10);padding:24px}
.crumbs{max-width:840px;margin:18px auto 0;padding:0 16px;font-size:13px;color:var(--mut)}
.crumbs a{color:var(--blue);text-decoration:none;font-weight:600}
.card{background:#fff;border:1px solid var(--line);border-radius:16px;box-shadow:0 10px 30px rgba(13,33,73,.08);padding:18px;display:none}
.card.show{display:block}
.card .row{display:flex;gap:16px}.card .row img{width:220px;height:124px;object-fit:cover;border-radius:10px;background:#e2e8f0}
.badge{display:inline-block;background:#e8effe;color:var(--blue-d);font-size:12px;font-weight:700;padding:3px 10px;border-radius:999px;margin-bottom:6px}
.card h3{font-size:16.5px;line-height:1.4}
.meta{color:var(--mut);font-size:13px;margin:6px 0}
.btn{background:var(--blue);color:#fff;border:none;font-size:14.5px;font-weight:700;padding:10px 20px;border-radius:10px;cursor:pointer;transition:.15s}
.btn:hover{background:var(--blue-d)} .btn.alt{background:#e8effe;color:var(--blue-d)} .btn.alt:hover{background:#d7e4fd}
.dl{display:inline-block;background:var(--green);color:#fff;text-decoration:none;font-weight:700;font-size:15.5px;padding:11px 26px;border-radius:10px;cursor:pointer;border:none;transition:.15s}
.dl:hover{background:#15803d} .dl.alt{background:var(--blue)} .dl.alt:hover{background:var(--blue-d)}
.err{background:#fef2f2;border:1px solid #fecaca;color:#991b1b;border-radius:12px;padding:14px 16px;display:none;font-size:15px}
.err.show{display:block}
.spin{display:none;text-align:center;padding:38px 16px 30px}
.spin.show{display:block}
.ld-logo{width:66px;height:66px;margin:0 auto 16px;border-radius:18px;background:linear-gradient(135deg,#2563eb,#1e40af);color:#fff;font-size:36px;font-weight:800;display:flex;align-items:center;justify-content:center;position:relative;box-shadow:0 12px 28px rgba(37,99,235,.35);animation:ldpulse 1.6s ease-in-out infinite;font-family:Inter,Arial,sans-serif}
.ld-logo::after{content:"";position:absolute;inset:-9px;border-radius:24px;border:3px solid rgba(37,99,235,.16);border-top-color:#2563eb;animation:ldspin .9s linear infinite}
.ld-txt{font-size:19px;font-weight:700;color:var(--navy)}
.ld-sub{font-size:13.5px;color:var(--mut);margin-top:5px}
.ld-bar{width:190px;height:5px;border-radius:99px;background:#e3ebfa;margin:18px auto 0;overflow:hidden}
.ld-bar i{display:block;height:100%;width:40%;border-radius:99px;background:linear-gradient(90deg,#2563eb,#60a5fa);animation:ldslide 1.15s ease-in-out infinite}
@keyframes ldspin{to{transform:rotate(360deg)}}
@keyframes ldpulse{0%,100%{transform:scale(1)}50%{transform:scale(1.06)}}
@keyframes ldslide{0%{margin-left:-40%}100%{margin-left:100%}}
.descbox{background:#f8fafc;border:1px solid var(--line);border-radius:10px;padding:12px;font-size:14px;white-space:pre-wrap;max-height:320px;overflow:auto}
table{width:100%;border-collapse:collapse;font-size:14.5px}td{padding:9px 6px;border-bottom:1px solid #eef2f7;vertical-align:top}td:first-child{color:var(--mut);width:170px;font-weight:600}
.tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}
.tag{background:#eef2ff;border:1px solid #c7d2fe;color:#3730a3;padding:6px 12px;border-radius:999px;font-size:13px}
.thumbs img{width:100%;border-radius:10px;margin:10px 0}
.calc label{font-weight:600;font-size:14px;display:block;margin:14px 0 6px}
.calc input,.calc select{width:100%;padding:12px;border:1px solid #cbd5e1;border-radius:10px;font-size:16px}
.res{display:flex;gap:12px;margin-top:18px;flex-wrap:wrap}
.res div{flex:1;min-width:130px;background:#eff6ff;border-radius:12px;padding:14px;text-align:center}
.res b{font-size:20px;color:var(--blue-d);display:block}
/* ---------- sections / grids ---------- */
.sec{max-width:1120px;margin:52px auto;padding:0 16px}
.sec h2{text-align:center;font-size:27px;font-weight:800;letter-spacing:-.01em;color:var(--navy);margin-bottom:6px}
.sec>p{text-align:center;color:var(--mut);margin-bottom:26px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(248px,1fr));gap:16px}
.tool{background:#fff;border:1px solid var(--line);border-radius:16px;padding:20px;text-decoration:none;color:inherit;display:block;transition:.16s}
.tool:hover{transform:translateY(-3px);border-color:#b9cff8;box-shadow:0 14px 30px rgba(13,33,73,.10)}
.tool .ic{font-size:25px;margin-bottom:9px}.tool b{font-size:15.5px;display:block;margin-bottom:5px;color:var(--ink)}
.tool p{font-size:13.5px;color:var(--mut);line-height:1.55}
.relgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:12px}
.relgrid a{background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px;text-decoration:none;color:var(--ink);font-weight:600;font-size:14.5px}
.relgrid a:hover{border-color:#b9cff8;background:#f4f8ff}
.related{max-width:840px;margin:30px auto 56px;padding:0 16px}.related h2{font-size:20px;margin-bottom:12px;color:var(--navy)}
/* ---------- content typography ---------- */
.content{max-width:840px;margin:36px auto 12px;padding:0 16px;line-height:1.78;color:var(--body);font-size:16px}
.content h2{color:var(--navy);margin:26px 0 9px;font-size:23px;font-weight:800;letter-spacing:-.01em}
.content h3{color:var(--navy);margin:17px 0 6px;font-size:17.5px}
.content p{margin-bottom:10px}
.content ol,.content ul{margin:6px 0 12px 22px}
.content li{margin-bottom:5px}
.content a{font-weight:600}
/* ---------- blog ---------- */
.postcard{background:#fff;border:1px solid var(--line);border-radius:16px;padding:22px;text-decoration:none;color:inherit;display:block;transition:.16s}
.postcard:hover{transform:translateY(-3px);border-color:#b9cff8;box-shadow:0 14px 30px rgba(13,33,73,.10)}
.postcard img{width:100%;height:172px;object-fit:cover;border-radius:10px;display:block;margin-bottom:14px}
.postcard .pmeta{color:var(--mut);font-size:12.5px;font-weight:700;letter-spacing:.05em;text-transform:uppercase;margin-bottom:8px}
.postcard b{font-size:17.5px;display:block;margin-bottom:7px;line-height:1.35;color:var(--navy)}
.postcard p{font-size:14px;color:var(--mut);line-height:1.6}
.article{max-width:760px;margin:10px auto 60px;padding:0 16px;line-height:1.8;color:var(--body);font-size:16.5px}
.article h1{color:var(--navy);font-size:31px;line-height:1.25;letter-spacing:-.01em;margin-bottom:10px}
.article .ameta{color:var(--mut);font-size:13.5px;margin-bottom:22px}
.article .feat{width:100%;border-radius:14px;display:block;margin:2px 0 24px}
.article h2{color:var(--navy);margin:26px 0 9px;font-size:23px}
.article h3{color:var(--navy);margin:18px 0 6px;font-size:18px}
.article p{margin-bottom:12px}.article ul,.article ol{margin:6px 0 14px 22px}.article li{margin-bottom:6px}
/* ---------- footer ---------- */
footer.site{background:var(--navy);color:#b9c9e8;margin-top:70px}
.fgrid{max-width:1120px;margin:0 auto;padding:48px 20px 30px;display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:30px}
.fgrid h4{color:#fff;font-size:15px;margin-bottom:13px}
.fgrid a{display:block;color:#b9c9e8;text-decoration:none;font-size:13.5px;padding:3.5px 0}
.fgrid a:hover{color:#fff}
.fbrand p{font-size:13.5px;line-height:1.65;max-width:300px}
.fbrand .logo{color:#fff;margin-bottom:12px}.fbrand .logo span{color:#7dd3fc}
.fbottom{border-top:1px solid rgba(255,255,255,.14);padding:18px 20px;text-align:center;font-size:13px;color:#8fa5cf}
@media(max-width:760px){.fgrid{grid-template-columns:1fr 1fr}.hero h1{font-size:28px}.card .row{flex-direction:column}.card .row img{width:100%;height:auto}}

/* Creator calculators */
.cgrid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:6px}
@media(max-width:560px){.cgrid{grid-template-columns:1fr}}
.cfield label{display:block;font-size:13px;font-weight:600;color:var(--mut);margin-bottom:5px}
.cfield input,.cfield select{width:100%;padding:11px 12px;border:1px solid #cbd5e1;border-radius:10px;font-size:15px;background:#fff;box-sizing:border-box}
.crow{display:flex;align-items:center;gap:10px;margin-bottom:12px}
.crow label{font-size:13px;font-weight:600;color:var(--mut)}
.crow select{padding:10px;border:1px solid #cbd5e1;border-radius:10px;font-size:14px;background:#fff}
.cformula{margin-top:14px;background:#f1f5ff;border:1px solid #dbe7ff;border-radius:10px;padding:10px 12px;font-size:13.5px;color:#1e3a8a;line-height:1.55}
.cbtns{display:flex;gap:8px;margin-top:14px;flex-wrap:wrap}
.chead{font-size:13px;font-weight:700;color:var(--mut);text-transform:uppercase;letter-spacing:.04em}
.cbig{font-size:32px;font-weight:800;color:var(--ink);margin:4px 0 8px}