:root {
  --ink: #10222e;
  --ink-soft: #46606f;
  --line: #d9e5ec;
  --bg: #ffffff;
  --bg-soft: #f2f7fa;
  --primary: #0b5f8a;
  --primary-dark: #08476a;
  --accent: #14a3a0;
  --accent-soft: #e2f5f4;
  --warn: #b45309;
  --warn-soft: #fff4e5;
  --radius: 12px;
  --shadow: 0 1px 2px rgb(16 34 46 / .06), 0 6px 20px rgb(16 34 46 / .06);
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font: 17px/1.65 var(--font);
  color: var(--ink);
  background: var(--bg);
}
img, svg { max-width: 100%; }
a { color: var(--primary); text-underline-offset: 2px; }
a:hover { color: var(--primary-dark); }
h1, h2, h3 { line-height: 1.2; letter-spacing: -.01em; }
h1 { font-size: clamp(1.9rem, 4.5vw, 2.8rem); margin: .2em 0 .4em; }
h2 { font-size: clamp(1.4rem, 3vw, 1.8rem); margin: 1.8em 0 .5em; }
h3 { font-size: 1.15rem; margin: 1.4em 0 .4em; }
p, ul, ol, table { margin: 0 0 1em; }
.wrap { width: min(1120px, 100% - 32px); margin-inline: auto; }
.narrow { width: min(760px, 100% - 32px); margin-inline: auto; }
.muted { color: var(--ink-soft); }
.small { font-size: .9rem; }

.skip { position: absolute; left: -9999px; }
.skip:focus { left: 16px; top: 16px; background: #fff; padding: 8px 12px; z-index: 10; }

/* Header */
.site-header { border-bottom: 1px solid var(--line); background: #fff; position: sticky; top: 0; z-index: 5; }
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 64px; }
.logo { display: flex; align-items: center; gap: 8px; text-decoration: none; color: var(--ink); font-weight: 700; font-size: 1.1rem; }
.logo svg { width: 28px; height: 28px; color: var(--primary); }
.logo b { color: var(--accent); font-weight: 700; }
.main-nav { display: flex; align-items: center; gap: 4px; }
.main-nav a { text-decoration: none; color: var(--ink); padding: 8px 12px; border-radius: 8px; font-size: .95rem; }
.main-nav a:hover { background: var(--bg-soft); }
.main-nav a[aria-current="page"] { color: var(--primary); font-weight: 600; }
.main-nav .btn { color: #fff; margin-left: 8px; }
.nav-toggle { display: none; }

@media (max-width: 860px) {
  .nav-toggle {
    display: block; font: inherit; font-size: .95rem; background: var(--bg-soft);
    border: 1px solid var(--line); border-radius: 8px; padding: 6px 14px; cursor: pointer;
  }
  .main-nav {
    display: none; position: absolute; left: 0; right: 0; top: 64px; background: #fff;
    flex-direction: column; align-items: stretch; padding: 8px 16px 16px; border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow);
  }
  .main-nav.open { display: flex; }
  .main-nav .btn { margin: 8px 0 0; text-align: center; }
}

.crumbs { font-size: .88rem; color: var(--ink-soft); padding-top: 16px; }
.crumbs a { color: var(--ink-soft); }

/* Buttons */
.btn {
  display: inline-block; background: var(--primary); color: #fff; text-decoration: none;
  padding: 12px 22px; border-radius: 10px; font-weight: 600; border: 2px solid var(--primary);
  cursor: pointer; font: inherit; font-weight: 600; line-height: 1.3;
}
.btn:hover { background: var(--primary-dark); border-color: var(--primary-dark); color: #fff; }
.btn-small { padding: 7px 14px; font-size: .92rem; }
.btn-ghost { background: transparent; color: var(--primary); }
.btn-ghost:hover { background: var(--bg-soft); color: var(--primary-dark); }

/* Hero */
.hero { background: linear-gradient(160deg, #e9f4fa 0%, #f6fbfd 55%, #e6f6f5 100%); padding: 56px 0 64px; border-bottom: 1px solid var(--line); }
.hero-grid { display: grid; grid-template-columns: 1.25fr 1fr; gap: 40px; align-items: center; }
.hero .lead { font-size: 1.15rem; color: var(--ink-soft); max-width: 36em; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 24px; }
.hero-card { background: #fff; border-radius: var(--radius); box-shadow: var(--shadow); padding: 24px; }
.hero-card h2 { margin-top: 0; font-size: 1.2rem; }
.eyebrow { text-transform: uppercase; letter-spacing: .08em; font-size: .8rem; font-weight: 700; color: var(--accent); margin: 0; }
@media (max-width: 860px) { .hero-grid { grid-template-columns: 1fr; } .hero { padding: 36px 0 44px; } }

.page-head { padding: 24px 0 8px; }
.page-head .lead { font-size: 1.12rem; color: var(--ink-soft); max-width: 44em; }

/* Sections & cards */
.section { padding: 48px 0; }
.section-soft { background: var(--bg-soft); }
.section > .wrap > h2:first-child { margin-top: 0; }
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 20px; }
.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 20px 22px;
  display: flex; flex-direction: column; gap: 6px;
}
.card h3 { margin: 0; font-size: 1.08rem; }
.card p { margin: 0; color: var(--ink-soft); font-size: .95rem; }
.card .more { margin-top: auto; padding-top: 10px; font-weight: 600; font-size: .95rem; }
a.card { text-decoration: none; color: inherit; transition: border-color .15s, box-shadow .15s; }
a.card:hover { border-color: var(--primary); box-shadow: var(--shadow); color: inherit; }
a.card .more { color: var(--primary); }
.icon { width: 40px; height: 40px; border-radius: 10px; background: var(--accent-soft); color: var(--accent); display: grid; place-items: center; font-size: 1.3rem; }

.steps { counter-reset: step; list-style: none; padding: 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 20px; }
.steps li { position: relative; padding: 18px 20px 18px 64px; background: #fff; border-radius: var(--radius); border: 1px solid var(--line); }
.steps li::before {
  counter-increment: step; content: counter(step); position: absolute; left: 18px; top: 18px;
  width: 32px; height: 32px; border-radius: 50%; background: var(--primary); color: #fff; display: grid; place-items: center; font-weight: 700;
}

/* Prose */
.prose { padding-bottom: 32px; }
.prose h2 { margin-top: 1.6em; }
.prose li { margin-bottom: .35em; }
.note, .warn, .tip {
  border-left: 4px solid var(--primary); background: var(--bg-soft); padding: 14px 18px; border-radius: 0 10px 10px 0; margin: 0 0 1.2em;
}
.note > :last-child, .warn > :last-child, .tip > :last-child { margin-bottom: 0; }
.warn { border-color: var(--warn); background: var(--warn-soft); }
.tip { border-color: var(--accent); background: var(--accent-soft); }
.article-meta { color: var(--ink-soft); font-size: .9rem; }
.product-links { display: flex; flex-wrap: wrap; gap: 10px; margin: 0 0 1.2em; padding: 0; list-style: none; }
.product-links a {
  display: inline-block; padding: 6px 12px; border-radius: 999px; background: #fff; border: 1px solid var(--line);
  text-decoration: none; font-size: .92rem;
}
.product-links a:hover { border-color: var(--primary); }

/* Tables */
.table-wrap { overflow-x: auto; margin: 0 0 1.2em; border: 1px solid var(--line); border-radius: 10px; }
table { border-collapse: collapse; width: 100%; font-size: .95rem; margin: 0; }
th, td { text-align: left; padding: 9px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
thead th { background: var(--bg-soft); font-weight: 600; white-space: nowrap; }
tbody tr:last-child td { border-bottom: 0; }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
tr.is-best td { background: var(--accent-soft); font-weight: 600; }

/* Forms / calculator */
.tool { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 24px; }
.form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px 24px; }
@media (max-width: 640px) { .form-grid { grid-template-columns: 1fr; } .tool { padding: 18px; } }
.field label, .field .label { display: block; font-weight: 600; margin-bottom: 6px; font-size: .95rem; }
.field .hint { font-size: .85rem; color: var(--ink-soft); margin: 6px 0 0; }
.inline { display: flex; gap: 8px; }
input[type="number"], input[type="password"], select {
  font: inherit; width: 100%; padding: 10px 12px; border: 1px solid #b9cbd6; border-radius: 8px; background: #fff; color: var(--ink);
}
.inline input { flex: 1 1 auto; min-width: 0; }
.inline select { flex: 0 0 auto; width: auto; }
input:focus, select:focus, button:focus-visible, a:focus-visible { outline: 3px solid rgb(11 95 138 / .35); outline-offset: 2px; }
.radio-row { display: flex; flex-wrap: wrap; gap: 8px; }
.radio-row label { font-weight: 400; margin: 0; }
.radio-row input { position: absolute; opacity: 0; }
.radio-row span { display: inline-block; padding: 8px 14px; border: 1px solid #b9cbd6; border-radius: 8px; cursor: pointer; font-size: .95rem; }
.radio-row input:checked + span { background: var(--primary); border-color: var(--primary); color: #fff; }
.radio-row input:focus-visible + span { outline: 3px solid rgb(11 95 138 / .35); outline-offset: 2px; }

.result { margin-top: 24px; }
.result[hidden] { display: none; }
.verdict { border-radius: var(--radius); padding: 20px 22px; background: linear-gradient(135deg, var(--primary), #0e7ea8); color: #fff; }
.verdict h3 { margin: 0 0 6px; font-size: 1.35rem; }
.verdict p { margin: 0; opacity: .95; }
.verdict a { color: #fff; }
.verdict.neutral { background: var(--accent-soft); color: var(--ink); }
.verdict.neutral a { color: var(--primary); }
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 12px; margin: 16px 0; }
.stat { background: var(--bg-soft); border-radius: 10px; padding: 14px 16px; }
.stat .v { display: block; font-size: 1.45rem; font-weight: 700; font-variant-numeric: tabular-nums; }
.stat .k { font-size: .85rem; color: var(--ink-soft); }
.hardness-scale { display: grid; grid-template-columns: repeat(5, 1fr); gap: 4px; margin: 12px 0 4px; }
.hardness-scale span { font-size: .75rem; text-align: center; padding: 6px 2px; border-radius: 6px; background: var(--bg-soft); color: var(--ink-soft); line-height: 1.25; }
.hardness-scale span.on { background: var(--primary); color: #fff; font-weight: 700; }
.converter-out { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 10px; margin-top: 16px; }

/* CTA + footer */
.cta-band { background: var(--primary); color: #fff; padding: 40px 0; margin-top: 48px; }
.cta-inner { display: flex; gap: 24px; align-items: center; justify-content: space-between; flex-wrap: wrap; }
.cta-band h2 { margin: 0 0 6px; font-size: 1.4rem; }
.cta-band p { margin: 0; opacity: .9; }
.cta-actions { display: flex; gap: 10px; flex-wrap: wrap; }
.cta-band .btn { background: #fff; color: var(--primary); border-color: #fff; }
.cta-band .btn:hover { background: #e9f4fa; }
.cta-band .btn-ghost { background: transparent; color: #fff; border-color: rgb(255 255 255 / .6); }
.cta-band .btn-ghost:hover { background: rgb(255 255 255 / .1); color: #fff; }
.site-footer { background: #0c1c26; color: #c3d3dc; padding: 40px 0 24px; font-size: .93rem; }
.site-footer a { color: #fff; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 32px; }
.footer-title { color: #fff; font-weight: 700; margin-bottom: 8px; }
.site-footer ul { list-style: none; padding: 0; }
.site-footer li { margin-bottom: 4px; }
.footer-note { border-top: 1px solid #23394a; padding-top: 16px; margin-top: 16px; font-size: .85rem; color: #8ea6b4; }
@media (max-width: 760px) { .footer-grid { grid-template-columns: 1fr; gap: 16px; } }

@media print {
  .site-header, .cta-band, .site-footer, .nav-toggle { display: none; }
}