:root {
  --bg: #0f1729;
  --bg-soft: #131d34;
  --card: #16213a;
  --card-border: #223052;
  --text: #eef1f8;
  --text-muted: #93a0c2;
  --accent: #f2b705;
  --accent-dark: #c99400;
  --positive: #35d99c;
  --negative: #ff7a7a;
  --radius: 14px;
  --max-width: 880px;
  --shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: radial-gradient(circle at top right, #16213e 0%, #0f1729 55%, #0b1120 100%);
  color: var(--text);
  font-family: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

.site-header {
  padding: 22px 0;
  border-bottom: 1px solid var(--card-border);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: "Manrope", sans-serif;
  font-weight: 800;
  font-size: 19px;
  color: var(--text);
  text-decoration: none;
}

.brand img {
  width: 32px;
  height: 32px;
}

.brand span {
  color: var(--accent);
}

nav.site-nav {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}

nav.site-nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 14px;
  transition: color 0.15s ease;
}

nav.site-nav a:hover {
  color: var(--accent);
}

.hero {
  padding: 56px 0 24px;
  text-align: center;
}

.hero h1 {
  font-family: "Manrope", sans-serif;
  font-weight: 800;
  font-size: clamp(28px, 4vw, 40px);
  margin: 0 0 14px;
  letter-spacing: -0.01em;
}

.hero p.lead {
  color: var(--text-muted);
  font-size: 17px;
  max-width: 640px;
  margin: 0 auto;
}

.calc-card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px;
  margin: 32px 0;
}

.mode-toggle {
  display: flex;
  background: var(--bg-soft);
  border-radius: 10px;
  padding: 4px;
  margin-bottom: 22px;
}

.mode-toggle button {
  flex: 1;
  border: none;
  background: transparent;
  color: var(--text-muted);
  padding: 11px 12px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
  font-family: inherit;
}

.mode-toggle button.active {
  background: var(--accent);
  color: #1a1300;
}

.field-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 16px;
}

@media (max-width: 560px) {
  .field-row {
    grid-template-columns: 1fr;
  }
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.field label {
  font-size: 13px;
  color: var(--text-muted);
  font-weight: 600;
}

.field input[type="number"],
.field select {
  background: var(--bg-soft);
  border: 1px solid var(--card-border);
  color: var(--text);
  border-radius: 10px;
  padding: 12px 14px;
  font-size: 16px;
  font-family: inherit;
  outline: none;
  transition: border-color 0.15s ease;
}

.field input[type="number"]:focus,
.field select:focus {
  border-color: var(--accent);
}

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 6px 0 20px;
  font-size: 14px;
  color: var(--text-muted);
}

.checkbox-row input {
  width: 18px;
  height: 18px;
  accent-color: var(--accent);
}

.result {
  background: var(--bg-soft);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  padding: 20px;
  display: grid;
  gap: 12px;
}

.result-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.result-row .label {
  color: var(--text-muted);
  font-size: 14px;
}

.result-row .value {
  font-family: "Manrope", sans-serif;
  font-weight: 700;
  font-size: 18px;
}

.result-row.main .value {
  font-size: 28px;
  color: var(--positive);
}

.result-row.tax .value {
  color: var(--negative);
}

.hint {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 4px;
}

.section-title {
  font-family: "Manrope", sans-serif;
  font-weight: 800;
  font-size: 24px;
  margin: 48px 0 8px;
}

.section-sub {
  color: var(--text-muted);
  margin: 0 0 20px;
}

.article {
  margin: 48px 0;
  color: var(--text-muted);
  font-size: 15px;
}

.article h2 {
  color: var(--text);
  font-family: "Manrope", sans-serif;
  font-size: 21px;
  margin: 28px 0 10px;
}

.article ul {
  padding-left: 20px;
}

.article a {
  color: var(--accent);
}

.related {
  margin: 40px 0;
  padding: 22px;
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
}

.related h2 {
  font-family: "Manrope", sans-serif;
  font-size: 18px;
  margin: 0 0 12px;
}

.related ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 8px;
}

.related a {
  color: var(--text);
  text-decoration: none;
  border-bottom: 1px dotted var(--card-border);
  display: block;
  padding: 6px 0;
}

.related a:hover {
  color: var(--accent);
}

.security-badge {
  margin: 14px 0 0;
  font-size: 12px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
}

.limit-bar-wrap {
  margin-bottom: 10px;
}

.limit-bar-track {
  background: var(--bg-soft);
  border: 1px solid var(--card-border);
  border-radius: 100px;
  height: 14px;
  overflow: hidden;
}

.limit-bar-fill {
  height: 100%;
  border-radius: 100px;
  background: var(--positive);
  transition: width 0.25s ease, background 0.25s ease;
}

.site-footer {
  border-top: 1px solid var(--card-border);
  margin-top: 60px;
  padding: 28px 0 40px;
  color: var(--text-muted);
  font-size: 13px;
  text-align: center;
}

.site-footer a {
  color: var(--text-muted);
}