:root {
  color-scheme: dark;
  --bg: #101316;
  --bg-soft: #131a21;
  --panel: #182129;
  --panel-2: #202b34;
  --text: #edf3f7;
  --muted: #a9b6c2;
  --line: #33404c;
  --accent: #f2b84b;
  --accent-2: #2fb3a3;
  --link: #9ed7ff;
  --shadow: 0 18px 45px rgba(0, 0, 0, 0.32);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at top left, rgba(47, 179, 163, 0.13), transparent 32%),
    radial-gradient(circle at top right, rgba(242, 184, 75, 0.12), transparent 30%),
    var(--bg);
  color: var(--text);
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.5;
}

a {
  color: var(--link);
  text-decoration: none;
}

a:hover {
  color: #ffffff;
  text-decoration: underline;
}

.container {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.site-header {
  background: rgba(16, 19, 22, 0.92);
  border-bottom: 1px solid var(--line);
}

.nav-wrap {
  min-height: 70px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
}

.logo {
  color: var(--text);
  font-size: 1.35rem;
  font-weight: 800;
}

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

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

.main-nav a {
  color: var(--text);
  font-weight: 700;
}

.tool-page-main {
  padding: 48px 0 78px;
}

.breadcrumb {
  color: var(--muted);
  margin-bottom: 18px;
}

.eyebrow {
  color: var(--accent-2);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0;
  margin: 0 0 10px;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  font-size: clamp(2.25rem, 5vw, 4.25rem);
  line-height: 1.06;
  margin-bottom: 16px;
}

h2 {
  font-size: clamp(1.55rem, 3vw, 2.35rem);
  line-height: 1.1;
  margin-bottom: 14px;
}

.tool-intro,
.calculator-note,
.faq p {
  color: var(--muted);
}

.tool-panel,
.calculator-card,
.faq,
.result-box {
  background: linear-gradient(180deg, var(--panel), var(--bg-soft));
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  padding: 24px;
}

.calculator-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(320px, 1.05fr);
  gap: 20px;
  align-items: start;
  margin-top: 22px;
}

.calc-tabs {
  display: grid;
  gap: 8px;
}

.calc-tab,
button {
  min-height: 44px;
  border-radius: 8px;
  border: 1px solid var(--line);
  cursor: pointer;
  font: inherit;
  font-weight: 800;
  padding: 10px 16px;
}

.calc-tab {
  width: 100%;
  background: var(--panel-2);
  color: var(--text);
  text-align: left;
}

.calc-tab.is-active,
button.primary {
  background: var(--accent);
  color: #1b1f23;
}

button.secondary {
  background: var(--panel-2);
  color: var(--text);
}

.calculator-card {
  min-height: 360px;
}

.calc-form {
  display: none;
}

.calc-form.is-active {
  display: block;
}

.calc-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.calc-field {
  margin-bottom: 14px;
}

.calc-field label {
  display: block;
  font-weight: 800;
  margin-bottom: 6px;
}

.calc-field input,
.calc-field select {
  width: 100%;
  min-height: 46px;
  background: #0c1116;
  border: 1px solid var(--line);
  color: var(--text);
  font: inherit;
  padding: 0 12px;
}

.calc-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 4px;
}

.result-box {
  border-left: 4px solid var(--accent-2);
  margin-top: 18px;
}

.result-value {
  color: var(--accent);
  font-size: 1.65rem;
  font-weight: 900;
  margin-bottom: 8px;
  overflow-wrap: anywhere;
}

.result-detail {
  color: var(--muted);
  margin-bottom: 0;
}

.calculator-note {
  margin-top: 16px;
}

.faq {
  margin-top: 24px;
}

details {
  background: #0c1116;
  border: 1px solid var(--line);
  margin: 10px 0;
  padding: 12px;
}

summary {
  color: var(--accent);
  cursor: pointer;
  font-weight: 800;
}

.site-footer {
  background: rgba(16, 19, 22, 0.84);
  border-top: 1px solid var(--line);
  padding: 26px 0;
}

.footer-wrap {
  color: var(--muted);
  display: flex;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
}

@media (max-width: 860px) {
  .calculator-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 620px) {
  .calc-row {
    grid-template-columns: 1fr;
  }
}