:root {
  --bg: #ffffff;
  --bg-elev: #f6f7fb;
  --text: #101828;
  --muted: #475467;
  --border: #e4e7ec;
  --primary: #2563eb;
  --primary-contrast: #ffffff;
  --success: #16a34a;
  --warning: #f59e0b;
  --danger: #dc2626;
  --shadow: 0 10px 24px rgba(16, 24, 40, 0.08);
  --radius: 14px;
  --radius-sm: 10px;
  --container: 1120px;
  --space-1: 6px;
  --space-2: 10px;
  --space-3: 14px;
  --space-4: 18px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 44px;
  --space-8: 64px;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1220;
    --bg-elev: #0f1b33;
    --text: #e5e7eb;
    --muted: #a9b3c6;
    --border: #20304f;
    --primary: #60a5fa;
    --primary-contrast: #0b1220;
    --success: #22c55e;
    --warning: #fbbf24;
    --danger: #f87171;
    --shadow: 0 18px 36px rgba(0, 0, 0, 0.45);
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, "Apple Color Emoji",
    "Segoe UI Emoji";
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

a {
  color: inherit;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

img {
  max-width: 100%;
  height: auto;
}

.container {
  width: min(var(--container), calc(100% - 2 * var(--space-5)));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) 0;
  gap: var(--space-4);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 800;
  letter-spacing: -0.02em;
}

.brand-mark {
  width: 28px;
  height: 28px;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--primary), color-mix(in srgb, var(--primary) 35%, var(--success)));
  box-shadow: var(--shadow);
}

.nav {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav a {
  color: var(--muted);
  font-weight: 600;
}

.nav a[aria-current="page"] {
  color: var(--text);
}

.hero {
  padding: var(--space-8) 0;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: var(--space-7);
  align-items: center;
}

.hero h1 {
  margin: 0 0 var(--space-3);
  font-size: clamp(34px, 4vw, 52px);
  line-height: 1.08;
  letter-spacing: -0.03em;
}

.hero p {
  margin: 0 0 var(--space-5);
  color: var(--muted);
  font-size: 18px;
}

.cta-row {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  border: 1px solid var(--border);
  padding: 12px 16px;
  border-radius: 999px;
  background: var(--bg-elev);
  color: var(--text);
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
}

.btn-primary {
  border-color: color-mix(in srgb, var(--primary) 55%, var(--border));
  background: var(--primary);
  color: var(--primary-contrast);
}

.btn:hover {
  filter: brightness(0.98);
  text-decoration: none;
}

.panel {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-6);
  box-shadow: var(--shadow);
}

.panel h2 {
  margin: 0 0 var(--space-2);
  font-size: 18px;
}

.panel p {
  margin: 0;
  color: var(--muted);
}

.section {
  padding: var(--space-7) 0;
}

.section-title {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-4);
}

.section-title h2 {
  margin: 0;
  font-size: 22px;
  letter-spacing: -0.01em;
}

.section-title p {
  margin: 0;
  color: var(--muted);
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
}

.card {
  position: relative;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-elev);
  padding: var(--space-5);
  box-shadow: var(--shadow);
  transition: transform 120ms ease, filter 120ms ease;
}

.card:hover {
  transform: translateY(-1px);
  filter: brightness(1.02);
}

.card h3 {
  margin: 0 0 var(--space-2);
  font-size: 16px;
}

.card p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.list {
  margin: var(--space-4) 0 0;
  padding-left: 18px;
  color: var(--muted);
}

.tool-layout {
  padding: var(--space-7) 0;
}

.tool-head h1 {
  margin: 0 0 var(--space-2);
  font-size: 34px;
  letter-spacing: -0.02em;
}

.tool-head p {
  margin: 0 0 var(--space-5);
  color: var(--muted);
}

.tool-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-5);
  align-items: start;
}

.form {
  display: grid;
  gap: var(--space-4);
}

.field label {
  display: block;
  font-weight: 700;
  margin-bottom: var(--space-1);
}

.help {
  margin-top: var(--space-1);
  color: var(--muted);
  font-size: 13px;
}

input,
select {
  width: 100%;
  padding: 12px 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
}

input:focus,
select:focus,
button:focus,
a:focus {
  outline: 3px solid color-mix(in srgb, var(--primary) 40%, transparent);
  outline-offset: 2px;
}

.checks {
  display: grid;
  gap: var(--space-2);
}

.check {
  display: flex;
  gap: var(--space-2);
  align-items: flex-start;
}

.check input {
  width: auto;
  margin-top: 3px;
}

.error {
  display: none;
  border: 1px solid color-mix(in srgb, var(--danger) 50%, var(--border));
  background: color-mix(in srgb, var(--danger) 10%, var(--bg));
  color: var(--text);
  padding: var(--space-3);
  border-radius: 12px;
}

.error[data-visible="true"] {
  display: block;
}

.result {
  display: none;
}

.result[data-visible="true"] {
  display: block;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg);
  font-weight: 800;
}

.badge.low {
  border-color: color-mix(in srgb, var(--success) 40%, var(--border));
}

.badge.medium {
  border-color: color-mix(in srgb, var(--warning) 55%, var(--border));
}

.badge.high,
.badge.extreme {
  border-color: color-mix(in srgb, var(--danger) 55%, var(--border));
}

.kpi {
  display: grid;
  gap: var(--space-3);
  margin: var(--space-4) 0 0;
}

.kpi-row {
  display: flex;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-3);
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--bg);
}

.kpi-row strong {
  font-weight: 800;
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: var(--space-6) 0;
  color: var(--muted);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: var(--space-5);
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-2);
}

.footer-links a {
  color: var(--muted);
  font-weight: 600;
}

@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }

  .grid {
    grid-template-columns: 1fr;
  }

  .tool-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }
}