:root {
  --bg: #050914;
  --bg2: #07111f;
  --panel: #0d1426;
  --panel2: #101a31;
  --line: rgba(255,255,255,0.08);
  --text: #f5f7fb;
  --muted: #a7b4cc;
  --accent: #7c3aed;
  --accent2: #2563eb;
  --radius: 22px;
  --radius-sm: 16px;
  --shadow: 0 18px 50px rgba(0,0,0,0.35);
  --max: 1240px;
}
* { box-sizing: border-box; }
html {
  scroll-behavior: smooth;
  scroll-padding-top: 240px;
}

#calculator-area {
  position: relative;
  scroll-margin-top: 240px;
}

#calculator-area::before {
  content: "";
  display: block;
  height: 240px;
  margin-top: -240px;
  visibility: hidden;
  pointer-events: none;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background:
    radial-gradient(circle at top left, rgba(37,99,235,0.16), transparent 32%),
    radial-gradient(circle at top right, rgba(124,58,237,0.18), transparent 28%),
    linear-gradient(180deg, #03060d 0%, var(--bg) 45%, var(--bg2) 100%);
  color: var(--text);
  min-height: 100vh;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(45deg, rgba(255,255,255,0.03) 25%, transparent 25%),
    linear-gradient(-45deg, rgba(255,255,255,0.03) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, rgba(255,255,255,0.03) 75%),
    linear-gradient(-45deg, transparent 75%, rgba(255,255,255,0.03) 75%);
  background-size: 70px 70px;
  background-position: 0 0, 0 35px, 35px -35px, -35px 0;
  opacity: 0.18;
  z-index: 0;
}
a { color: inherit; text-decoration: none; }
button { font: inherit; }
.site-shell {
  position: relative;
  z-index: 1;
  max-width: var(--max);
  margin: 0 auto;
  padding: 24px 18px 60px;
}
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 20px;
  border: 1px solid var(--line);
  background: rgba(8, 15, 30, 0.84);
  backdrop-filter: blur(12px);
  border-radius: 20px;
  box-shadow: var(--shadow);
  position: sticky;
  top: 12px;
  z-index: 10;
}
.brand { display:flex; align-items:center; gap:12px; min-width:0; }
.brand-badge {
  width: 44px; height:44px; border-radius:12px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  display:grid; place-items:center; font-weight:800; font-size:18px;
  box-shadow: 0 8px 24px rgba(37,99,235,0.35);
}
.brand h1 { margin:0; font-size: clamp(1.2rem, 2vw, 1.8rem); line-height:1.1; }
.brand p { margin:4px 0 0; color:var(--muted); font-size:0.95rem; }
.topnav { display:flex; flex-wrap:wrap; gap:10px; justify-content:flex-end; }
.topnav a {
  padding:10px 14px; border-radius:999px; border:1px solid var(--line);
  background: rgba(255,255,255,0.03); color:var(--text); font-size:0.95rem;
  transition: transform .18s ease, border-color .18s ease, background .18s ease;
}
.topnav a:hover { transform: translateY(-1px); border-color: rgba(124,58,237,.55); background: rgba(124,58,237,.12); }
.hero {
  display:grid; grid-template-columns: 1.2fr .8fr; gap:22px; margin-top:24px; align-items:stretch;
}
.hero-card,.ad-box,.tool-section,.calculator-panel,.result-card,.note-card {
  border:1px solid var(--line); background: linear-gradient(180deg, rgba(13,20,38,.92), rgba(8,14,28,.95));
  border-radius: var(--radius); box-shadow: var(--shadow);
}
.hero-card { padding:32px; }
.pill {
  display:inline-flex; align-items:center; gap:8px; padding:8px 12px; border-radius:999px;
  background: rgba(124,58,237,.15); border:1px solid rgba(124,58,237,.28); color:#ddd6fe;
  font-weight:700; font-size:.85rem; letter-spacing:.03em; text-transform:uppercase;
}
.hero h2 { margin:18px 0 14px; font-size: clamp(2rem, 4vw, 3.3rem); line-height:1.05; }
.hero p { margin:0; color:var(--muted); font-size:1.05rem; line-height:1.7; max-width:760px; }
.hero-actions { display:flex; flex-wrap:wrap; gap:12px; margin-top:22px; }
.btn {
  display:inline-flex; align-items:center; justify-content:center; gap:8px; padding:14px 18px; border-radius:14px;
  font-weight:700; border:1px solid transparent; cursor:pointer;
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: linear-gradient(135deg, var(--accent), var(--accent2)); color:white; box-shadow: 0 12px 24px rgba(37,99,235,.22); }
.btn-secondary { border-color: var(--line); background: rgba(255,255,255,.03); color: var(--text); }
.ad-box { padding:24px; display:flex; align-items:center; }
.ad-box-inner {
  width:100%; min-height:280px; border-radius:18px; border:1px dashed rgba(255,255,255,.18);
  background: linear-gradient(180deg, rgba(255,255,255,.03), rgba(255,255,255,.015));
  display:grid; place-items:center; text-align:center; padding:24px; color:var(--muted); line-height:1.6; font-size:.98rem;
}
.ad-box-inner strong { display:block; color:var(--text); font-size:1.2rem; margin-bottom:10px; }
.tool-section,.calculator-panel { margin-top:28px; padding:26px; }
.section-head h3, .panel-header h3 { margin:0; font-size: clamp(1.45rem, 2vw, 2rem); }
.section-head p, .panel-header p { margin:8px 0 0; color:var(--muted); line-height:1.65; max-width:780px; }
.tool-grid { display:grid; grid-template-columns: repeat(4, minmax(0,1fr)); gap:16px; margin-top:20px; }
.tool-card {
  display:block; width:100%; text-align:left; cursor:pointer; min-height:164px; padding:20px;
  border-radius: var(--radius-sm); border:1px solid var(--line);
  background: linear-gradient(180deg, rgba(14,22,40,.98), rgba(10,17,31,.98)); color:var(--text);
  transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease;
}
.tool-card:hover { transform: translateY(-4px); border-color: rgba(124,58,237,.6); box-shadow: 0 24px 40px rgba(0,0,0,.35); }
.tool-chip {
  display:inline-block; font-size:.78rem; font-weight:700; color:#ddd6fe; background: rgba(124,58,237,.16);
  border:1px solid rgba(124,58,237,.3); border-radius:999px; padding:7px 10px; margin-bottom:12px;
  text-transform:uppercase; letter-spacing:.04em;
}
.tool-card h4 { margin:0 0 10px; font-size:1.18rem; color:var(--text); line-height:1.2; }
.tool-card p { margin:0; color:var(--muted); line-height:1.6; font-size:.96rem; }
.panel-header { display:flex; justify-content:space-between; align-items:flex-start; gap:14px; margin-bottom:22px; }

#panel-title {
  scroll-margin-top: 240px;
  padding-top: 6px;
}

@media (max-width:760px) {
  #panel-title { scroll-margin-top: 210px; }
}
.panel-close { cursor:pointer; padding:12px 16px; border:1px solid var(--line); border-radius:12px; background: rgba(255,255,255,.03); color: var(--text); font-weight:700; }
.panel-content { display:none; }
.panel-content.active { display:block; animation: fadeUp .28s ease; }
@keyframes fadeUp { from { opacity:0; transform:translateY(10px);} to { opacity:1; transform:translateY(0);} }
.form-grid { display:grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap:16px; }
.field { display:flex; flex-direction:column; gap:8px; }
label { font-weight:700; font-size:.95rem; }
input,select {
  width:100%; border:1px solid rgba(255,255,255,.1); border-radius:14px; background: rgba(255,255,255,.04);
  color:var(--text); padding:14px; font-size:1rem; outline:none;
}
input::placeholder { color:#8391a8; }
input:focus,select:focus { border-color: rgba(124,58,237,.75); box-shadow:0 0 0 3px rgba(124,58,237,.12); }
.panel-actions { display:flex; flex-wrap:wrap; gap:12px; margin-top:20px; }
.result-grid { margin-top:24px; display:grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap:16px; }
.result-card { padding:18px; border-radius:18px; background: linear-gradient(180deg, rgba(16,26,49,.95), rgba(12,19,34,.98)); }
.result-label { display:block; color:var(--muted); margin-bottom:8px; font-size:.92rem; }
.result-value { font-size:1.7rem; font-weight:800; line-height:1.2; }
.result-note { display:block; color:var(--muted); margin-top:8px; font-size:.9rem; line-height:1.5; }
.footer { margin-top:34px; padding:28px; border-radius:var(--radius); border:1px solid var(--line); background: linear-gradient(180deg, rgba(9,15,28,.95), rgba(6,12,23,.98)); color:var(--muted); line-height:1.7; text-align:center; box-shadow:var(--shadow); }
.footer strong { color:var(--text); }
@media (max-width:1100px) {
  .hero { grid-template-columns:1fr; }
  .tool-grid, .form-grid, .result-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
}
@media (max-width:760px) {
  html { scroll-padding-top: 210px; }
  #calculator-area { scroll-margin-top: 210px; }
  #calculator-area::before { height: 210px; margin-top: -210px; }
  .site-shell { padding:14px 12px 44px; }
  .topbar,.hero-card,.tool-section,.calculator-panel,.ad-box,.footer { padding:18px; }
  .topbar,.panel-header { display:block; }
  .topnav { margin-top:14px; justify-content:flex-start; }
  .tool-grid,.form-grid,.result-grid { grid-template-columns:1fr; }
  .tool-card { min-height:auto; }
}


.content-section{
  margin:24px 0 0;
  padding:24px;
  background:linear-gradient(180deg, rgba(16,24,42,.95), rgba(9,16,30,.98));
  border:1px solid rgba(255,255,255,.08);
  border-radius:20px;
  box-shadow:0 18px 36px rgba(0,0,0,.25);
}
.content-section h2{
  margin:0 0 14px;
  font-size:1.65rem;
  color:#f8fbff;
}
.content-section h3{
  margin:18px 0 10px;
  font-size:1.15rem;
  color:#f8fbff;
}
.content-section p,
.content-section li{
  color:#c8d2e4;
  line-height:1.75;
  font-size:1rem;
}
.content-section ul{margin:10px 0 0 20px;}
.content-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;}
.article-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;}
.article-card{display:block;padding:20px;border-radius:18px;background:linear-gradient(180deg, rgba(18,30,54,.96), rgba(10,17,31,.98));border:1px solid rgba(255,255,255,.08);color:inherit;text-decoration:none;}
.article-card h4{margin:0 0 10px;color:#f8fbff;font-size:1.08rem;}
.article-card p{margin:0;color:#c8d2e4;line-height:1.65;}
.footer-links{margin-top:14px;display:flex;flex-wrap:wrap;gap:14px;justify-content:center;}
.footer-links a{color:#d8e4ff;text-decoration:none;}
.footer-links a:hover{text-decoration:underline;}
.content-page{max-width:900px;margin:40px auto;padding:28px;border:1px solid rgba(255,255,255,.08);border-radius:22px;background:linear-gradient(180deg, rgba(12,20,36,.95), rgba(8,14,28,.98));box-shadow:0 18px 40px rgba(0,0,0,.3);}
.content-page h1{margin:0 0 16px;font-size:2rem;}
.content-page h2{margin:28px 0 12px;font-size:1.35rem;}
.content-page p,.content-page li{color:#c8d2e4;line-height:1.75;}
.content-page ul{margin-left:20px;}
.content-page a{color:#d8e4ff;}
@media (max-width: 900px){.content-grid,.article-grid{grid-template-columns:1fr;}}