/* MathlyPro — Final Design System */

:root {
  --blue:     #2563EB;
  --blue-bg:  #EFF6FF;
  --blue-bd:  #DBEAFE;
  --green:    #16A34A;
  --green-bg: #F0FDF4;
  --red:      #DC2626;
  --red-bg:   #FFF1F2;
  --amber:    #D97706;
  --ink:      #0A0A0A;
  --ink2:     #444;
  --ink3:     #888;
  --ink4:     #BBB;
  --bg:       #FAFAFA;
  --surface:  #FFFFFF;
  --bd:       #EBEBEB;
  --bd2:      #E0E0E0;
  --dark:     #0A0A0A;
  --dark2:    #141414;
  --dark3:    #1C1C1C;
  --r-sm:     8px;
  --r:        12px;
  --r-lg:     16px;
  --r-xl:     20px;
  --font:     'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --serif:    'Instrument Serif', Georgia, 'Times New Roman', serif;
  --mono:     'DM Mono', 'Fira Code', monospace;
}

*,*::before,*::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: var(--font); background: var(--bg); color: var(--ink); line-height: 1.55; -webkit-font-smoothing: antialiased; }

/* ── NAV ── */
header { position: sticky; top: 0; z-index: 200; background: rgba(255,255,255,0.96); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px); border-bottom: 1px solid var(--bd); }
.hdr { max-width: 1100px; margin: 0 auto; padding: 0 32px; display: flex; align-items: center; justify-content: space-between; height: 58px; }
.logo { text-decoration: none; display: flex; align-items: baseline; gap: 1px; }
.logo-serif { font-family: var(--serif); font-style: italic; font-weight: 400; font-size: 26px; color: var(--ink); letter-spacing: -0.01em; }
.logo-sans { font-family: var(--font); font-weight: 700; font-size: 26px; color: var(--ink); letter-spacing: -0.04em; }
.logo-dot { font-family: var(--font); font-weight: 700; font-size: 26px; color: var(--blue); }
nav { display: flex; align-items: center; }
nav a { font-size: 13px; font-weight: 500; color: var(--ink3); padding: 0 14px; height: 58px; display: flex; align-items: center; border-bottom: 2px solid transparent; text-decoration: none; transition: all 0.15s; }
nav a:hover { color: var(--ink); border-bottom-color: var(--ink); }
nav a.on { color: var(--ink); border-bottom-color: var(--ink); font-weight: 600; }
.nav-btn { height: 36px; padding: 0 18px; background: var(--ink); color: #fff; border: none; border-radius: 9px; font-family: var(--font); font-size: 13px; font-weight: 600; cursor: pointer; letter-spacing: -0.01em; transition: opacity 0.15s; }
.nav-btn:hover { opacity: 0.8; }
.burger { display: none; background: none; border: none; cursor: pointer; padding: 4px; flex-direction: column; gap: 4px; }
.burger span { display: block; width: 18px; height: 1.5px; background: var(--ink); border-radius: 1px; transition: all 0.2s; }

/* ── PAGE ── */
.page { max-width: 1100px; margin: 0 auto; padding: 40px 32px 100px; }
.crumb { font-size: 12px; color: var(--ink4); display: flex; align-items: center; gap: 5px; margin-bottom: 14px; }
.crumb a { color: var(--blue); text-decoration: none; font-weight: 500; }
.crumb a:hover { text-decoration: underline; }
.pg-h { font-family: var(--serif); font-style: italic; font-size: clamp(2rem, 4vw, 2.8rem); font-weight: 400; letter-spacing: -0.02em; color: var(--ink); line-height: 1.2; margin-bottom: 8px; }
.pg-sub { font-size: 14px; color: var(--ink3); margin-bottom: 28px; }

/* ── ADS ── */
.ad { background: var(--bg); border: 1.5px dashed var(--bd2); border-radius: var(--r); display: flex; align-items: center; justify-content: center; color: var(--ink4); font-size: 10px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.1em; }
.ad-top { width: 100%; height: 88px; margin-bottom: 32px; }
.ad-btm { width: 100%; height: 88px; margin-top: 48px; }
.ad-mid { width: 100%; height: 88px; margin: 28px 0; }
.ad-side { width: 100%; height: 250px; }

/* ── LAYOUT ── */
.cols { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; align-items: start; }
.left-col, .right-col { display: flex; flex-direction: column; gap: 14px; }

/* ── CARD ── */
.card { background: var(--surface); border: 1px solid var(--bd); border-radius: var(--r-xl); overflow: hidden; }
.card-hd { padding: 14px 20px; border-bottom: 1px solid var(--bg); display: flex; align-items: center; justify-content: space-between; }
.card-hd h2 { font-size: 11px; font-weight: 600; color: var(--ink3); letter-spacing: 0.07em; text-transform: uppercase; }
.card-bd { padding: 20px; }
.card-flush { padding: 0; }

/* ── INPUTS ── */
.field { margin-bottom: 16px; }
.field:last-child { margin-bottom: 0; }
.lbl { display: block; font-size: 11px; font-weight: 600; color: var(--ink3); text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 7px; }
.lbl .badge { background: var(--blue-bg); color: var(--blue); border-radius: 20px; padding: 2px 7px; font-size: 10px; font-weight: 600; letter-spacing: 0; text-transform: none; margin-left: 5px; vertical-align: middle; }
.iw { position: relative; display: flex; align-items: center; }
.pfx, .sfx { position: absolute; font-size: 13px; font-weight: 500; color: var(--ink4); pointer-events: none; }
.pfx { left: 12px; }
.sfx { right: 12px; }
input[type=number], input[type=text], input[type=date], select {
  width: 100%; height: 44px; background: var(--bg);
  border: 1px solid var(--bd); border-radius: var(--r);
  font-family: var(--mono); font-size: 14px; font-weight: 500;
  color: var(--ink); outline: none; appearance: none;
  transition: all 0.15s;
}
input[type=number]:focus, input[type=text]:focus, input[type=date]:focus, select:focus {
  background: var(--surface); border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(37,99,235,0.08);
}
.has-pfx input, .has-pfx select { padding: 0 12px 0 30px; }
.has-sfx input { padding: 0 30px 0 12px; }
.bare input, .bare select { padding: 0 12px; }
select { padding: 0 12px; cursor: pointer; }
input[type=date] { padding: 0 12px; font-family: var(--font); }
.frow { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }

/* Segment */
.seg { display: flex; background: var(--bg); border-radius: var(--r); padding: 3px; gap: 2px; }
.seg-b { flex: 1; height: 34px; border: none; background: transparent; border-radius: var(--r-sm); font-family: var(--font); font-size: 12px; font-weight: 600; color: var(--ink3); cursor: pointer; transition: all 0.15s; }
.seg-b:hover { color: var(--ink); }
.seg-b.on { background: var(--surface); color: var(--ink); box-shadow: 0 1px 3px rgba(0,0,0,0.08); border: 1px solid var(--bd); }

/* Range */
input[type=range] { width: 100%; height: 3px; background: var(--bd); border-radius: 2px; border: none; outline: none; appearance: none; cursor: pointer; margin-top: 4px; accent-color: var(--blue); }
input[type=range]::-webkit-slider-thumb { appearance: none; width: 18px; height: 18px; border-radius: 50%; background: var(--surface); border: 2px solid var(--blue); box-shadow: 0 1px 4px rgba(37,99,235,0.25); cursor: pointer; transition: transform 0.15s; }
input[type=range]::-webkit-slider-thumb:hover { transform: scale(1.15); }
.sl-row { display: flex; justify-content: space-between; align-items: center; margin-bottom: 4px; }
.sl-lbl { font-size: 11px; font-weight: 600; color: var(--ink3); text-transform: uppercase; letter-spacing: 0.08em; }
.sl-val { font-family: var(--mono); font-size: 13px; font-weight: 500; color: var(--blue); }
.sl-ends { display: flex; justify-content: space-between; font-size: 10px; color: var(--ink4); margin-top: 4px; }

/* Pills */
.pills { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 12px; }
.pill { height: 32px; padding: 0 14px; border-radius: 16px; border: 1px solid var(--bd2); background: var(--surface); color: var(--ink3); font-family: var(--font); font-size: 12px; font-weight: 600; cursor: pointer; transition: all 0.15s; }
.pill:hover { border-color: var(--blue); color: var(--blue); }
.pill.on { background: var(--blue); color: #fff; border-color: var(--blue); }

/* ── DARK RESULT PANEL ── */
.result-panel { background: var(--dark); border-radius: var(--r-xl); padding: 24px; color: #fff; }
.rp-ey { font-size: 10px; font-weight: 600; color: #444; text-transform: uppercase; letter-spacing: 0.1em; margin-bottom: 8px; }
.rp-big { font-family: var(--mono); font-size: clamp(2rem, 4vw, 2.8rem); font-weight: 500; letter-spacing: -0.04em; color: #fff; line-height: 1; margin-bottom: 5px; }
.rp-sub { font-size: 12px; color: #444; margin-bottom: 20px; }
.stats { display: grid; grid-template-columns: repeat(3,1fr); gap: 8px; }
.stat { background: var(--dark2); border-radius: var(--r); padding: 12px; }
.stat-l { font-size: 10px; font-weight: 600; color: #444; text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 4px; }
.stat-v { font-family: var(--mono); font-size: 14px; font-weight: 500; color: #fff; }
.stat-v.pos { color: #4ADE80; }
.stat-v.neg { color: #F87171; }

/* Donut in dark panel */
.donut-wrap { display: flex; align-items: center; gap: 16px; margin-top: 18px; padding-top: 18px; border-top: 1px solid var(--dark3); }
.dl { display: flex; flex-direction: column; gap: 8px; flex: 1; }
.dl-row { display: flex; align-items: center; gap: 8px; }
.dl-dot { width: 7px; height: 7px; border-radius: 50%; flex-shrink: 0; }
.dl-name { font-size: 11px; color: #555; flex: 1; }
.dl-val { font-family: var(--mono); font-size: 11px; font-weight: 500; color: #fff; }

/* ── INSIGHT ── */
.insight { background: var(--blue-bg); border: 1px solid var(--blue-bd); border-radius: var(--r-lg); padding: 14px 16px; }
.insight-ey { font-size: 10px; font-weight: 600; color: var(--blue); text-transform: uppercase; letter-spacing: 0.09em; margin-bottom: 6px; }
.insight p { font-size: 13px; color: #1D4ED8; line-height: 1.65; }
.insight strong { color: #1E40AF; font-weight: 700; }

/* ── COMPARE ── */
.cmp { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.cmp-col { background: var(--bg); border: 1px solid var(--bd); border-radius: var(--r-lg); padding: 14px; }
.cmp-col.on { border-color: var(--blue); background: var(--blue-bg); }
.cmp-lbl { font-size: 10px; font-weight: 600; color: var(--ink4); text-transform: uppercase; letter-spacing: 0.09em; margin-bottom: 10px; }
.cmp-col.on .cmp-lbl { color: var(--blue); }
.cmp-r { display: flex; justify-content: space-between; align-items: baseline; padding: 5px 0; border-bottom: 1px solid var(--bd); font-size: 12px; }
.cmp-col.on .cmp-r { border-color: var(--blue-bd); }
.cmp-r:last-child { border: none; }
.cmp-k { color: var(--ink3); }
.cmp-v { font-family: var(--mono); font-weight: 500; color: var(--ink); font-size: 12px; }
.cmp-v.g { color: var(--green); }
.cmp-v.r { color: var(--red); }

/* ── TABLE ── */
.tbl-wrap { overflow-x: auto; }
.tbl-wrap table { width: 100%; border-collapse: collapse; font-size: 13px; }
.tbl-wrap thead th { background: var(--bg); color: var(--ink4); font-size: 10px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.07em; padding: 10px 14px; text-align: right; border-bottom: 1px solid var(--bd); }
.tbl-wrap thead th:first-child { text-align: left; }
.tbl-wrap tbody td { padding: 9px 14px; text-align: right; border-bottom: 1px solid var(--bg); font-family: var(--mono); font-size: 12px; font-weight: 500; color: var(--ink); }
.tbl-wrap tbody td:first-child { text-align: left; font-family: var(--font); color: var(--ink3); font-weight: 600; font-size: 12px; }
.tbl-wrap tbody tr:last-child td { border: none; }
.tbl-wrap tbody tr:hover td { background: var(--bg); }

/* ── SIDEBAR ── */
.side-card { background: var(--surface); border: 1px solid var(--bd); border-radius: var(--r-xl); padding: 18px; }
.side-card h3 { font-size: 13px; font-weight: 600; color: var(--ink); margin-bottom: 12px; letter-spacing: -0.01em; }
.side-card ul { list-style: none; display: flex; flex-direction: column; gap: 8px; }
.side-card li { font-size: 12px; color: var(--ink2); display: flex; gap: 8px; line-height: 1.5; }
.side-card li::before { content: '→'; color: var(--blue); font-weight: 600; flex-shrink: 0; }
.side-card p { font-size: 12px; color: var(--ink2); line-height: 1.6; }
.side-card a { color: var(--blue); text-decoration: none; font-size: 12px; font-weight: 500; }
.side-card a:hover { text-decoration: underline; }
.rate-row { display: flex; justify-content: space-between; align-items: center; padding: 7px 0; border-bottom: 1px solid var(--bg); }
.rate-row:last-child { border: none; }
.rate-k { font-size: 12px; color: var(--ink3); }
.rate-v { font-family: var(--mono); font-size: 12px; font-weight: 500; color: var(--ink); }

/* ── SEO CONTENT ── */
.seo { margin-top: 52px; max-width: 680px; }
.seo h2 { font-family: var(--serif); font-size: 1.6rem; font-weight: 400; letter-spacing: -0.02em; color: var(--ink); margin-bottom: 10px; }
.seo h3 { font-size: 14px; font-weight: 600; color: var(--ink); margin: 20px 0 6px; }
.seo p { font-size: 14px; color: var(--ink3); line-height: 1.8; margin-bottom: 10px; }

/* ── FAQ ── */
.faq { margin-top: 44px; }
.faq h2 { font-family: var(--serif); font-size: 1.6rem; font-weight: 400; letter-spacing: -0.02em; color: var(--ink); margin-bottom: 14px; }
.faq-item { border: 1px solid var(--bd); border-radius: var(--r-lg); margin-bottom: 6px; background: var(--surface); overflow: hidden; }
.faq-item.open { border-color: var(--blue-bd); }
.faq-btn { width: 100%; background: none; border: none; display: flex; justify-content: space-between; align-items: center; padding: 14px 18px; text-align: left; cursor: pointer; font-family: var(--font); font-size: 13px; font-weight: 600; color: var(--ink); gap: 10px; transition: color 0.15s; }
.faq-btn:hover { color: var(--blue); }
.faq-ic { width: 20px; height: 20px; border-radius: 50%; background: var(--bg); display: flex; align-items: center; justify-content: center; font-size: 14px; color: var(--ink3); flex-shrink: 0; transition: all 0.2s; }
.faq-item.open .faq-ic { background: var(--blue-bg); color: var(--blue); transform: rotate(45deg); }
.faq-ans { display: none; padding: 0 18px 14px; font-size: 13px; color: var(--ink3); line-height: 1.75; }
.faq-item.open .faq-ans { display: block; }

/* ── HOMEPAGE ── */
.hero-bg { background: var(--surface); border-bottom: 1px solid var(--bd); }
.hero { max-width: 1100px; margin: 0 auto; padding: 64px 32px 56px; display: grid; grid-template-columns: 1fr 420px; gap: 64px; align-items: center; }
.hero-ey { display: flex; align-items: center; gap: 8px; font-size: 11px; font-weight: 600; letter-spacing: 0.09em; text-transform: uppercase; color: var(--ink4); margin-bottom: 20px; }
.hero-ey::before { content: ''; width: 20px; height: 1px; background: var(--bd2); }
.hero-h { font-family: var(--serif); font-size: clamp(2.4rem, 5vw, 3.4rem); font-weight: 400; line-height: 1.1; letter-spacing: -0.02em; color: var(--ink); margin-bottom: 18px; }
.hero-h em { font-style: italic; color: var(--blue); }
.hero-p { font-size: 15px; color: var(--ink3); line-height: 1.65; max-width: 360px; margin-bottom: 28px; }
.srch { display: flex; gap: 8px; max-width: 380px; }
.srch input { flex: 1; height: 44px; border: 1px solid var(--bd2); border-radius: 10px; padding: 0 16px; font-family: var(--font); font-size: 13px; outline: none; background: var(--bg); color: var(--ink); transition: all 0.15s; }
.srch input:focus { background: var(--surface); border-color: var(--blue); box-shadow: 0 0 0 3px rgba(37,99,235,0.08); }
.srch input::placeholder { color: var(--ink4); }
.srch button { height: 44px; padding: 0 18px; background: var(--ink); color: #fff; border: none; border-radius: 10px; font-family: var(--font); font-size: 13px; font-weight: 600; cursor: pointer; transition: opacity 0.15s; }
.srch button:hover { opacity: 0.8; }
.srch-drop { display: none; position: absolute; left: 0; right: 0; top: calc(100% + 5px); background: var(--surface); border: 1px solid var(--bd); border-radius: var(--r-lg); overflow: hidden; box-shadow: 0 8px 24px rgba(0,0,0,0.08); z-index: 50; }
.sdrop-item { display: flex; align-items: center; gap: 10px; padding: 10px 14px; text-decoration: none; color: inherit; transition: background 0.1s; border-bottom: 1px solid var(--bg); }
.sdrop-item:last-child { border: none; }
.sdrop-item:hover { background: var(--bg); }
.sdrop-name { font-size: 13px; font-weight: 600; color: var(--ink); }
.sdrop-desc { font-size: 11px; color: var(--ink4); margin-left: auto; }
.hero-stats { display: flex; gap: 28px; margin-top: 32px; padding-top: 28px; border-top: 1px solid var(--bd); }
.hs-n { font-family: var(--mono); font-size: 20px; font-weight: 500; color: var(--ink); letter-spacing: -0.03em; }
.hs-l { font-size: 11px; color: var(--ink4); margin-top: 2px; }

/* Calc card in hero */
.cc { background: var(--dark); border-radius: 20px; overflow: hidden; box-shadow: 0 20px 60px rgba(0,0,0,0.15); }
.cc-head { padding: 22px 22px 18px; border-bottom: 1px solid var(--dark3); }
.cc-ey { font-size: 10px; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase; color: #444; margin-bottom: 7px; }
.cc-num { font-family: var(--mono); font-size: 38px; font-weight: 500; color: #fff; letter-spacing: -0.04em; line-height: 1; }
.cc-sub { font-size: 11px; color: #444; margin-top: 5px; }
.cc-stats { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; background: var(--dark3); }
.cc-stat { background: var(--dark); padding: 13px 18px; }
.ccs-l { font-size: 10px; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; color: #444; margin-bottom: 3px; }
.ccs-v { font-family: var(--mono); font-size: 14px; font-weight: 500; color: #fff; }
.ccs-v.r { color: #F87171; }
.cc-inputs { padding: 18px 22px; display: flex; flex-direction: column; gap: 14px; }
.ci-row { display: flex; justify-content: space-between; align-items: center; }
.ci-lbl { font-size: 12px; color: #555; font-weight: 500; }
.ci-val { font-family: var(--mono); font-size: 12px; color: var(--blue); font-weight: 500; }
input[type=range].dsl { width: 100%; height: 2px; background: #1E1E1E; border: none; outline: none; appearance: none; cursor: pointer; margin-top: 7px; border-radius: 1px; accent-color: var(--blue); }
input[type=range].dsl::-webkit-slider-thumb { appearance: none; width: 14px; height: 14px; border-radius: 50%; background: #fff; border: 2px solid var(--blue); cursor: pointer; }
.cc-insight { background: var(--blue-bg); border-top: 1px solid var(--blue-bd); padding: 12px 22px; font-size: 12px; color: #1D4ED8; line-height: 1.55; }

/* Category grid */
.cat-row { display: flex; align-items: center; gap: 12px; margin: 44px 0 14px; }
.cat-lbl { font-size: 11px; font-weight: 600; letter-spacing: 0.09em; text-transform: uppercase; color: var(--ink4); white-space: nowrap; }
.cat-line { flex: 1; height: 1px; background: var(--bd); }
.tgrid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px,1fr)); gap: 8px; }
.tc { display: flex; align-items: center; gap: 12px; background: var(--surface); border: 1px solid var(--bd); border-radius: var(--r-xl); padding: 16px; text-decoration: none; color: inherit; transition: all 0.18s; cursor: pointer; }
.tc:hover { border-color: var(--blue); background: var(--blue-bg); transform: translateY(-1px); box-shadow: 0 4px 16px rgba(37,99,235,0.1); }
.tc-icon { width: 36px; height: 36px; border-radius: 9px; display: flex; align-items: center; justify-content: center; font-size: 16px; flex-shrink: 0; }
.tc-name { font-size: 13px; font-weight: 600; color: var(--ink); margin-bottom: 2px; letter-spacing: -0.01em; }
.tc-desc { font-size: 11px; color: var(--ink4); line-height: 1.4; }

/* Why section */
.why { margin-top: 52px; border: 1px solid var(--bd); border-radius: var(--r-xl); background: var(--surface); padding: 40px; }
.why-h { font-family: var(--serif); font-size: 1.8rem; font-weight: 400; letter-spacing: -0.02em; color: var(--ink); margin-bottom: 6px; }
.why-sub { font-size: 13px; color: var(--ink3); margin-bottom: 24px; }
.why-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px,1fr)); gap: 10px; }
.wi { padding: 20px; background: var(--bg); border-radius: var(--r-lg); border: 1px solid var(--bd); }
.wi-icon { width: 34px; height: 34px; border-radius: 9px; display: flex; align-items: center; justify-content: center; font-size: 16px; margin-bottom: 10px; }
.wi-t { font-size: 13px; font-weight: 600; color: var(--ink); margin-bottom: 4px; }
.wi-d { font-size: 12px; color: var(--ink3); line-height: 1.55; }

/* ── FOOTER ── */
footer { background: var(--surface); border-top: 1px solid var(--bd); padding: 48px 32px; }
.ftr { max-width: 1100px; margin: 0 auto; display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; }
footer .logo { margin-bottom: 10px; display: inline-flex; }
footer p { font-size: 13px; color: var(--ink4); line-height: 1.6; margin-top: 8px; }
footer h4 { font-size: 11px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.09em; color: var(--ink3); margin-bottom: 14px; }
footer ul { list-style: none; display: flex; flex-direction: column; gap: 8px; }
footer ul a { color: var(--ink4); text-decoration: none; font-size: 13px; transition: color 0.15s; }
footer ul a:hover { color: var(--ink); }
.ftr-bt { max-width: 1100px; margin: 24px auto 0; padding-top: 20px; border-top: 1px solid var(--bd); display: flex; justify-content: space-between; align-items: center; font-size: 12px; color: var(--ink4); flex-wrap: wrap; gap: 8px; }
.ftr-bt a { color: var(--ink3); text-decoration: none; }
.ftr-bt a:hover { color: var(--ink); }

/* ── ANIMATIONS ── */
@keyframes fadeUp { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: translateY(0); } }
.au { animation: fadeUp 0.3s ease both; }

/* ── RESPONSIVE ── */
@media (max-width: 860px) {
  nav { display: none; }
  nav.open { display: flex; flex-direction: column; position: fixed; top: 58px; inset: 58px 0 0; background: rgba(255,255,255,0.98); padding: 14px; gap: 3px; z-index: 199; overflow-y: auto; }
  nav.open a { padding: 12px 14px; font-size: 15px; border-bottom: none; border-radius: var(--r); }
  .nav-btn { display: none; }
  .burger { display: flex; }
  .hero { grid-template-columns: 1fr; padding: 44px 24px 36px; gap: 36px; }
  .cols { grid-template-columns: 1fr; }
  .stats { grid-template-columns: 1fr 1fr; }
  .ftr { grid-template-columns: 1fr 1fr; gap: 24px; }
  .cmp { grid-template-columns: 1fr; }
}
@media (max-width: 520px) {
  .page { padding: 24px 16px 80px; }
  .card-bd { padding: 16px; }
  .tgrid { grid-template-columns: 1fr; }
  .frow { grid-template-columns: 1fr; }
  .ftr { grid-template-columns: 1fr; }
  .hero-stats { gap: 20px; }
  .why { padding: 24px; }
}
@media print { header, footer, .ad, .burger { display: none; } }