*{box-sizing:border-box}
:root{
  --bg:#f5f7fb;--surface:#fff;--surface-soft:#f8fbff;--text:#1f2937;--muted:#667085;
  --border:#d9e2ef;--primary:#2563eb;--primary-dark:#1d4ed8;--success:#0f9d58;--danger:#dc2626;
  --shadow:0 14px 36px rgba(15,23,42,.08);--radius:18px
}
html,body{margin:0;padding:0;font-family:Arial,Helvetica,sans-serif;background:var(--bg);color:var(--text)}
a{text-decoration:none;color:inherit}
.container{width:min(1260px,calc(100% - 32px));margin:0 auto}
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.96);backdrop-filter:blur(10px);border-bottom:1px solid var(--border)}
.header-inner{min-height:72px;display:flex;align-items:center;justify-content:space-between;gap:18px}
.brand{font-size:1.3rem;font-weight:900}.brand span{color:var(--primary)}
.main-nav{display:flex;gap:8px;flex-wrap:wrap}.main-nav a{padding:8px 12px;border-radius:10px;color:var(--muted);font-weight:700;font-size:.9rem}.main-nav a.active,.main-nav a:hover{background:#eaf1ff;color:var(--primary)}
.hero{padding:58px 0 40px;background:linear-gradient(135deg,#edf4ff 0%,#f9fbff 100%);border-bottom:1px solid var(--border)}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:28px;align-items:center}
.badge{display:inline-flex;align-items:center;padding:8px 12px;border-radius:999px;background:#e8f0ff;color:var(--primary);font-size:.84rem;font-weight:800}
.hero h1{margin:16px 0 10px;font-size:clamp(2rem,4vw,2.9rem);line-height:1.08}
.page-header h1{margin:10px 0 10px;font-size:clamp(1.35rem,2.2vw,1.75rem);line-height:1.12}
.hero p,.page-header p,.section-head p,.tool-card p,.info-card p,.footer-inner p,.help-text{color:var(--muted);line-height:1.65}
.panel-card,.metric,.sidebar,.tool-panel,.tool-card,.info-card,.ad-box,.cta-box{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow)}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:24px}
.metric-grid{display:flex;gap:14px;flex-wrap:wrap;margin-top:26px}.metric{padding:14px 16px;min-width:120px}.metric strong{display:block;font-size:1.2rem}.metric span{font-size:.92rem;color:var(--muted)}
.panel-card{padding:22px}.code-block{margin:0;white-space:pre-wrap;line-height:1.65;color:#1e3a8a}
.section{padding:36px 0}.section-head{margin-bottom:18px}.section-head h2{margin:0 0 8px;font-size:1.8rem}
.toolbar{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:18px}
.input,.textarea,.select{width:100%;border:1px solid var(--border);border-radius:14px;background:#fff;padding:14px 15px;font-size:1rem;outline:none}
.input,.select{height:48px}.textarea{min-height:130px;resize:vertical;font-family:inherit}.textarea-lg{min-height:220px}
.btn{height:48px;border:0;border-radius:12px;padding:0 18px;font-size:1rem;font-weight:900;cursor:pointer}
.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-dark)}.btn-secondary{background:#eef2f7;color:var(--text)}
.tool-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.tool-card{padding:20px}.tool-card h3{margin:10px 0 8px;font-size:1.05rem}.tool-badge{display:inline-flex;padding:6px 10px;border-radius:999px;background:#eef4ff;color:var(--primary);font-size:.76rem;font-weight:800}.tool-link{display:inline-block;margin-top:14px;color:var(--primary);font-weight:800}
.tool-layout{display:grid;grid-template-columns:250px minmax(0,1fr) 280px;gap:24px;padding:28px 0 42px}
.sidebar,.right-rail{height:fit-content;position:sticky;top:92px}
.sidebar{padding:18px}.sidebar h3,.right-rail h3{margin:0 0 12px}
.side-link{display:block;padding:9px 12px;border-radius:12px;color:var(--muted);font-weight:700;font-size:.9rem}.side-link+.side-link{margin-top:8px}.side-link.active,.side-link:hover{background:#eaf1ff;color:var(--primary)}
.tool-panel{padding:22px}.field{margin-bottom:16px}.field label{display:block;margin-bottom:8px;font-weight:800}.option-row,.action-row{display:flex;gap:12px;flex-wrap:wrap}.option-row label,.check-grid label{display:flex;align-items:center;gap:8px;padding:12px 14px;border-radius:12px;background:var(--surface-soft);border:1px solid var(--border);font-weight:700}
.check-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin-bottom:16px}
.result-area{margin-top:18px}.result-label{margin-bottom:8px;color:var(--muted);font-weight:800}.result-box{min-height:76px;display:flex;align-items:center;justify-content:center;text-align:center;padding:16px;border:2px dashed var(--border);border-radius:14px;background:#fbfdff;font-size:1.1rem;font-weight:900;word-break:break-word}.result-multi{justify-content:flex-start;align-items:flex-start;text-align:left;white-space:pre-wrap;font-size:1rem;line-height:1.6}
.feedback{margin-top:10px;min-height:20px;font-weight:800;color:var(--success)}.feedback.error{color:var(--danger)}
.ad-box{padding:14px;margin-bottom:14px}.ad-label{font-size:.72rem;letter-spacing:.08em;color:var(--muted);text-transform:uppercase;font-weight:800;margin-bottom:8px}.ad-slot{min-height:90px;border:2px dashed #c7d5ea;border-radius:14px;background:linear-gradient(180deg,#fbfdff,#f3f8ff);display:flex;align-items:center;justify-content:center;text-align:center;color:#6b7280;font-weight:800;padding:12px}.ad-slot.inline{min-height:120px}.ad-slot.tall{min-height:320px}
.content-stack>*+*{margin-top:18px}
.info-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.info-card{padding:18px}.info-card h3{margin:0 0 8px}
.site-footer{padding:24px 0 40px;border-top:1px solid var(--border);background:#fff}.footer-inner{display:flex;justify-content:space-between;gap:18px}
@media (max-width:1180px){.tool-grid{grid-template-columns:repeat(3,1fr)}.tool-layout{grid-template-columns:240px minmax(0,1fr)}.right-rail{grid-column:1/-1;position:static}.hero-grid{grid-template-columns:1fr}}
@media (max-width:860px){.tool-layout,.info-grid,.check-grid{grid-template-columns:1fr}.tool-grid{grid-template-columns:repeat(2,1fr)}.sidebar,.right-rail{position:static}}
@media (max-width:640px){.header-inner{padding:12px 0;align-items:flex-start;flex-direction:column}.tool-grid{grid-template-columns:1fr}.btn{width:100%}.footer-inner{flex-direction:column}.result-box{font-size:1rem}}