:root {
  --bg: #f4f7fb;
  --panel: #ffffff;
  --ink: #172033;
  --muted: #687386;
  --primary: #155e75;
  --primary-2: #0e7490;
  --accent: #7c3aed;
  --ok: #047857;
  --warn: #b45309;
  --line: #dfe7ef;
  --shadow: 0 18px 45px rgba(15, 23, 42, 0.08);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background: linear-gradient(135deg, #eef6fb 0%, #f8fafc 55%, #edfdf5 100%);
}

a { color: inherit; text-decoration: none; }
.container { width: min(1180px, calc(100% - 40px)); margin: 0 auto; }

.navbar {
  position: sticky; top: 0; z-index: 10;
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; min-height: 72px; gap: 20px; }
.logo { display: flex; flex-direction: column; font-weight: 800; letter-spacing: -0.03em; }
.logo span { color: var(--primary-2); font-size: 0.78rem; letter-spacing: 0.08em; text-transform: uppercase; }
.nav-links { display: flex; gap: 8px; flex-wrap: wrap; justify-content: flex-end; }
.nav-links a { padding: 10px 13px; border-radius: 999px; color: #475569; font-weight: 650; font-size: 0.92rem; }
.nav-links a:hover, .nav-links a.active { background: #e0f2fe; color: var(--primary); }

.hero { padding: 70px 0 45px; }
.hero-grid { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 30px; align-items: center; }
.eyebrow { display: inline-flex; padding: 8px 12px; background: #e0f2fe; color: var(--primary); border-radius: 999px; font-weight: 800; font-size: 0.82rem; }
h1 { font-size: clamp(2.3rem, 5vw, 4.9rem); line-height: 0.96; letter-spacing: -0.07em; margin: 18px 0; }
.lead { font-size: 1.13rem; line-height: 1.75; color: var(--muted); max-width: 760px; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 26px; }
.btn, button.btn { border: 0; cursor: pointer; display: inline-flex; align-items: center; justify-content: center; padding: 13px 18px; border-radius: 14px; background: var(--primary); color: white; font-weight: 800; box-shadow: 0 10px 20px rgba(21, 94, 117, 0.2); }
.btn.secondary { background: white; color: var(--primary); border: 1px solid var(--line); box-shadow: none; }
.hero-card { background: var(--panel); border: 1px solid var(--line); border-radius: 28px; padding: 24px; box-shadow: var(--shadow); }
.hero-card h2 { margin-top: 0; font-size: 1.3rem; }
.flow { display: grid; gap: 10px; }
.flow-step { display: flex; gap: 12px; align-items: flex-start; padding: 12px; background: #f8fafc; border-radius: 16px; border: 1px solid #eef2f7; }
.flow-step strong { display: grid; place-items: center; min-width: 30px; height: 30px; border-radius: 50%; background: #ccfbf1; color: var(--ok); }

.section { padding: 34px 0; }
.section-head { display: flex; align-items: end; justify-content: space-between; gap: 20px; margin-bottom: 18px; }
.section h2 { margin: 0 0 8px; font-size: clamp(1.55rem, 3vw, 2.3rem); letter-spacing: -0.04em; }
.section p { color: var(--muted); line-height: 1.65; }
.card, .formula-card { background: var(--panel); border: 1px solid var(--line); border-radius: 22px; padding: 22px; box-shadow: var(--shadow); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.kpis { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin: 20px 0; }
.kpi { background: var(--panel); border: 1px solid var(--line); border-radius: 20px; padding: 18px; box-shadow: var(--shadow); }
.kpi span { color: var(--muted); font-weight: 750; font-size: 0.86rem; }
.kpi strong { display: block; font-size: 2rem; letter-spacing: -0.04em; margin: 6px 0; }
.kpi small { color: var(--muted); }
.table-wrap { width: 100%; overflow-x: auto; background: var(--panel); border: 1px solid var(--line); border-radius: 18px; box-shadow: var(--shadow); }
table { width: 100%; border-collapse: collapse; min-width: 820px; }
th { background: #0f172a; color: white; text-align: left; font-size: 0.83rem; letter-spacing: 0.03em; text-transform: uppercase; }
th, td { padding: 12px 14px; border-bottom: 1px solid #e5e7eb; vertical-align: top; }
td { color: #334155; }
td span { color: #64748b; font-size: 0.86rem; }
tr:hover td { background: #f8fafc; }
.badge, .pill { display: inline-flex; padding: 5px 9px; border-radius: 999px; font-size: 0.78rem; font-weight: 800; background: #e5e7eb; color: #374151; }
.level-1 { background: #f1f5f9; color: #475569; }
.level-2 { background: #fef3c7; color: #92400e; }
.level-3 { background: #dbeafe; color: #1d4ed8; }
.level-4 { background: #dcfce7; color: #047857; }
.warning { background: #ffedd5; color: #b45309; }
.form-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 12px; align-items: end; }
label { display: grid; gap: 7px; color: #475569; font-weight: 750; }
input, select { width: 100%; border: 1px solid var(--line); border-radius: 12px; padding: 12px 13px; background: #fff; color: var(--ink); font: inherit; }
.checks { display: flex; gap: 14px; flex-wrap: wrap; align-items: center; margin: 14px 0; }
.checks label { display: flex; align-items: center; gap: 7px; font-weight: 650; }
.checks input { width: auto; }
.small-btn { border: 0; border-radius: 10px; padding: 8px 10px; font-weight: 800; cursor: pointer; background: #e0f2fe; color: var(--primary); }
.small-btn.danger { background: #fee2e2; color: #b91c1c; }
.message { min-height: 24px; color: var(--primary); font-weight: 800; }
.chart-card canvas { width: 100%; height: 320px; display: block; }
.footer { padding: 40px 0; color: var(--muted); text-align: center; }
ul { line-height: 1.8; color: #475569; }
.code { font-family: "SFMono-Regular", Consolas, monospace; background: #0f172a; color: #e2e8f0; border-radius: 14px; padding: 16px; overflow-x: auto; }

@media (max-width: 900px) {
  .hero-grid, .grid-2, .grid-3, .kpis { grid-template-columns: 1fr; }
  .form-grid { grid-template-columns: 1fr; }
  .nav-inner { align-items: flex-start; flex-direction: column; padding: 14px 0; }
  .nav-links { justify-content: flex-start; }
}


.estimator-grid { grid-template-columns: repeat(4, 1fr); }
.check-inline { align-self: center; display: flex; grid-auto-flow: column; align-items: center; gap: 9px; margin-top: 24px; }
.check-inline input { width: auto; }
.estimate-box { border: 1px solid var(--line); background: #f8fafc; border-radius: 16px; padding: 12px 14px; display: grid; gap: 3px; }
.estimate-box span { color: var(--muted); font-weight: 800; font-size: 0.84rem; }
.estimate-box strong { font-size: 1.65rem; color: var(--primary); line-height: 1; }
.estimate-box small { color: var(--muted); }
@media (max-width: 900px) { .estimator-grid { grid-template-columns: 1fr; } }

.simple-task-form {
  grid-template-columns: 2fr 1fr 1fr 1fr auto;
}
@media (max-width: 900px) { .simple-task-form { grid-template-columns: 1fr; } }