:root {
  color-scheme: light;
  --ink: #102a43;
  --ink-soft: #486581;
  --navy-deep: #071a2b;
  --teal: #0f766e;
  --teal-dark: #0b5f59;
  --teal-pale: #dff7f2;
  --orange: #f59e0b;
  --paper: #ffffff;
  --canvas: #f4f7f9;
  --canvas-deep: #e9eff3;
  --line: #d4dee5;
  --line-strong: #afc1cc;
  --danger: #b42318;
  --danger-bg: #fff1f0;
  --shadow-sm: 0 1px 2px rgba(16, 42, 67, 0.08);
  --shadow-lg: 0 24px 60px rgba(16, 42, 67, 0.14);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --font: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

[data-theme="dark"] {
  color-scheme: dark;
  --ink: #edf5f9;
  --ink-soft: #a9bdc9;
  --teal: #5eead4;
  --teal-dark: #99f6e4;
  --teal-pale: #123d3a;
  --orange: #fbbf24;
  --paper: #102532;
  --canvas: #091a24;
  --canvas-deep: #142d3b;
  --line: #294655;
  --line-strong: #3d6072;
  --danger: #fda29b;
  --danger-bg: #431d1a;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 24px 60px rgba(0, 0, 0, 0.32);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
}

body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
}

button,
input,
select {
  font: inherit;
}

button,
select {
  cursor: pointer;
}

a {
  color: inherit;
}

.wrap,
.narrow-wrap {
  width: min(1180px, calc(100% - 40px));
  margin-inline: auto;
}

.narrow-wrap {
  width: min(860px, calc(100% - 40px));
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 1000;
  transform: translateY(-150%);
  border-radius: var(--radius-sm);
  background: var(--paper);
  padding: 10px 16px;
  box-shadow: var(--shadow-lg);
  font-weight: 700;
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid color-mix(in srgb, var(--line) 75%, transparent);
  background: color-mix(in srgb, var(--canvas) 88%, transparent);
  backdrop-filter: blur(18px);
}

.site-nav {
  min-height: 72px;
  display: flex;
  align-items: center;
  gap: 28px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  text-decoration: none;
  font-weight: 800;
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.brand-mark {
  width: 34px;
  height: 34px;
  display: inline-grid;
  place-items: center;
  border-radius: 10px;
  background: var(--teal);
  color: var(--navy-deep);
  font-size: 1.1rem;
  font-weight: 900;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-left: auto;
}

.nav-links a {
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 700;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--teal-dark);
}

.theme-toggle {
  min-width: 64px;
  min-height: 38px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--paper);
  color: var(--ink);
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.theme-toggle:hover {
  border-color: var(--line-strong);
}

.hero {
  position: relative;
  overflow: hidden;
  background: radial-gradient(circle at 85% 10%, rgba(94, 234, 212, 0.16), transparent 28%), linear-gradient(145deg, #061b2c, #103c4c);
  color: #f7fbfd;
}

.hero::after {
  content: "%";
  position: absolute;
  right: -2vw;
  bottom: -18vw;
  color: rgba(255, 255, 255, 0.035);
  font-size: min(44vw, 620px);
  font-weight: 900;
  line-height: 1;
  pointer-events: none;
}

.hero-grid {
  position: relative;
  z-index: 1;
  min-height: 430px;
  padding-block: 76px 82px;
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(300px, 0.75fr);
  align-items: center;
  gap: 76px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--teal-dark);
  font-size: 0.78rem;
  font-weight: 850;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.hero .eyebrow {
  color: #5eead4;
}

.hero h1 {
  max-width: 720px;
  margin: 0;
  font-size: clamp(3rem, 8vw, 6.8rem);
  line-height: 0.92;
  letter-spacing: -0.075em;
}

.hero-lead {
  max-width: 690px;
  margin: 28px 0 0;
  color: #d9e7ed;
  font-size: clamp(1.05rem, 2vw, 1.28rem);
  line-height: 1.65;
}

.hero-points {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.hero-points li {
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.07);
  padding: 6px 12px;
  color: #eaf4f7;
  font-size: 0.82rem;
  font-weight: 650;
}

.quick-example {
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-lg);
  background: rgba(4, 20, 31, 0.42);
  padding: 30px;
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.18);
  backdrop-filter: blur(12px);
}

.quick-label {
  margin: 0 0 20px;
  color: #a9c3cf;
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.quick-equation {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 12px;
  color: #d7e7ed;
  font-size: 0.88rem;
}

.quick-answer {
  display: flex;
  align-items: baseline;
  gap: 13px;
  margin-block: 24px 8px;
}

.quick-answer strong {
  color: #5eead4;
  font-size: clamp(3rem, 6vw, 4.6rem);
  line-height: 1;
  letter-spacing: -0.06em;
}

.quick-answer span {
  color: #d7e7ed;
  font-weight: 700;
}

.quick-example > p:last-child {
  margin: 0;
  color: #a9c3cf;
  font-size: 0.88rem;
}

.calculator-section,
.content-section,
.comparison-section,
.tools-section,
.finance-links,
.faq-section {
  padding-block: 88px;
}

.calculator-section {
  padding-top: 72px;
}

.section-heading {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 30px;
  margin-bottom: 30px;
}

.section-heading h2,
.content-section h2,
.comparison-section h2,
.faq-section h2 {
  margin: 0;
  color: var(--ink);
  font-size: clamp(2rem, 4vw, 3.1rem);
  line-height: 1.08;
  letter-spacing: -0.045em;
}

.section-heading > p,
.section-intro {
  max-width: 620px;
  margin: 0;
  color: var(--ink-soft);
}

.calculator-heading {
  align-items: center;
}

.currency-control {
  display: grid;
  gap: 6px;
  color: var(--ink-soft);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.currency-control select {
  min-width: 130px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--paper);
  color: var(--ink);
  padding: 10px 34px 10px 12px;
  font-weight: 700;
  text-transform: none;
  letter-spacing: 0;
}

.calculator-app {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--paper);
  box-shadow: var(--shadow-lg);
}

.mode-tabs {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  padding: 8px;
  border-bottom: 1px solid var(--line);
  background: var(--canvas-deep);
}

.mode-tab {
  min-height: 48px;
  border: 0;
  border-radius: 10px;
  background: transparent;
  color: var(--ink-soft);
  padding: 10px 14px;
  font-size: 0.9rem;
  font-weight: 800;
}

.mode-tab:hover {
  color: var(--ink);
}

.mode-tab.is-active {
  background: var(--paper);
  color: var(--teal-dark);
  box-shadow: var(--shadow-sm);
}

.calculator-panel {
  display: grid;
  grid-template-columns: minmax(0, 1.18fr) minmax(320px, 0.82fr);
}

.calculator-panel[hidden] {
  display: none;
}

.input-column,
.result-column {
  padding: clamp(28px, 5vw, 52px);
}

.input-column {
  border-right: 1px solid var(--line);
}

.panel-heading {
  margin-bottom: 28px;
}

.panel-kicker,
.result-heading {
  margin: 0 0 8px;
  color: var(--teal-dark);
  font-size: 0.75rem;
  font-weight: 850;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.panel-heading h3 {
  margin: 0;
  font-size: clamp(1.45rem, 3vw, 2rem);
  line-height: 1.2;
  letter-spacing: -0.035em;
}

.panel-heading p:last-child {
  max-width: 590px;
  margin: 10px 0 0;
  color: var(--ink-soft);
}

.field-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.three-fields {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.field {
  display: grid;
  gap: 8px;
  font-size: 0.88rem;
  font-weight: 800;
}

.money-input,
.percent-input {
  display: flex;
  align-items: center;
  min-height: 54px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  background: var(--canvas);
  transition: border-color 160ms ease, box-shadow 160ms ease;
}

.money-input:focus-within,
.percent-input:focus-within {
  border-color: var(--teal);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--teal) 18%, transparent);
}

.money-input > span,
.percent-input > span {
  padding-inline: 15px;
  color: var(--ink-soft);
  font-weight: 800;
}

.money-input input,
.percent-input input {
  width: 100%;
  min-width: 0;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--ink);
  padding: 14px 14px 14px 0;
  font-size: 1.05rem;
  font-weight: 750;
}

.percent-input input {
  padding-left: 14px;
  padding-right: 0;
}

.reset-button {
  margin-top: 20px;
  border: 0;
  background: transparent;
  color: var(--teal-dark);
  padding: 4px 0;
  font-size: 0.84rem;
  font-weight: 800;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.form-message {
  margin: 16px 0 0;
  border: 1px solid color-mix(in srgb, var(--danger) 35%, var(--line));
  border-radius: var(--radius-sm);
  background: var(--danger-bg);
  color: var(--danger);
  padding: 10px 12px;
  font-size: 0.86rem;
  font-weight: 700;
}

.result-column {
  background: color-mix(in srgb, var(--teal-pale) 56%, var(--paper));
}

.primary-result {
  margin: 18px 0 28px;
}

.primary-result > span {
  display: block;
  font-size: clamp(2.7rem, 7vw, 4.8rem);
  font-weight: 850;
  line-height: 1;
  letter-spacing: -0.065em;
  overflow-wrap: anywhere;
}

.primary-result small {
  display: block;
  margin-top: 9px;
  color: var(--ink-soft);
  font-size: 0.9rem;
  font-weight: 700;
}

.result-list {
  display: grid;
  margin: 0;
}

.result-list > div {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  border-top: 1px solid var(--line);
  padding-block: 14px;
}

.result-list dt {
  color: var(--ink-soft);
}

.result-list dd {
  margin: 0;
  font-weight: 850;
}

.result-bar {
  display: flex;
  min-height: 38px;
  overflow: hidden;
  margin-top: 22px;
  border-radius: 8px;
  background: var(--canvas-deep);
}

.result-bar > div {
  min-width: 0;
  display: grid;
  place-items: center;
  transition: width 220ms ease;
}

.result-bar span {
  overflow: hidden;
  color: #ffffff;
  font-size: 0.72rem;
  font-weight: 850;
  white-space: nowrap;
}

.cost-bar {
  background: #486581;
}

.profit-bar {
  background: #0f766e;
}

.formula-line {
  margin: 18px 0 0;
  color: var(--ink-soft);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.78rem;
  overflow-wrap: anywhere;
}

.privacy-note {
  margin: 18px 0 0;
  color: var(--ink-soft);
  font-size: 0.82rem;
  text-align: center;
}

.content-section,
.finance-links {
  background: var(--paper);
}

.section-intro {
  margin-top: 18px;
  font-size: 1.05rem;
}

.formula-list {
  margin-top: 44px;
  border-top: 1px solid var(--line);
}

.formula-item {
  display: grid;
  grid-template-columns: 1fr minmax(270px, 0.9fr);
  align-items: center;
  gap: 36px;
  border-bottom: 1px solid var(--line);
  padding-block: 28px;
}

.formula-number {
  margin: 0 0 5px;
  color: var(--teal-dark);
  font-size: 0.75rem;
  font-weight: 850;
  letter-spacing: 0.1em;
}

.formula-item h3 {
  margin: 0;
  font-size: 1.14rem;
}

.formula-item p:last-child {
  margin: 5px 0 0;
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.formula-item code {
  display: block;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--canvas);
  padding: 15px 17px;
  font-size: 0.86rem;
  white-space: normal;
}

.comparison-section {
  background: var(--navy-deep);
  color: #eaf4f7;
}

.comparison-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(480px, 1.2fr);
  align-items: center;
  gap: 70px;
}

.comparison-section .eyebrow {
  color: #5eead4;
}

.comparison-section h2 {
  color: #ffffff;
}

.comparison-copy > p:not(.eyebrow) {
  color: #b9ced8;
}

.comparison-copy strong {
  color: #ffffff;
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: var(--radius-md);
}

table {
  width: 100%;
  border-collapse: collapse;
  background: rgba(255, 255, 255, 0.04);
}

caption {
  padding: 14px 18px;
  color: #a9c3cf;
  font-size: 0.75rem;
  text-align: left;
}

th,
td {
  padding: 15px 18px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: right;
  white-space: nowrap;
}

th:first-child,
td:first-child {
  text-align: left;
}

th {
  color: #ffffff;
  font-size: 0.8rem;
}

td {
  color: #d9e7ed;
  font-variant-numeric: tabular-nums;
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.tool-card {
  display: flex;
  min-height: 250px;
  flex-direction: column;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--paper);
  padding: 25px;
  text-decoration: none;
  transition: border-color 160ms ease, transform 160ms ease, box-shadow 160ms ease;
}

.tool-card:hover,
.tool-card:focus-visible {
  border-color: var(--teal);
  transform: translateY(-3px);
  box-shadow: 0 16px 34px rgba(16, 42, 67, 0.1);
}

.tool-tag {
  align-self: flex-start;
  border-radius: 999px;
  background: var(--teal-pale);
  color: var(--teal-dark);
  padding: 4px 9px;
  font-size: 0.7rem;
  font-weight: 850;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.tool-card h3 {
  margin: 18px 0 8px;
  font-size: 1.2rem;
  line-height: 1.3;
}

.tool-card p {
  margin: 0 0 22px;
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.text-link {
  margin-top: auto;
  color: var(--teal-dark);
  font-size: 0.86rem;
  font-weight: 850;
}

.featured-tool {
  background: var(--navy-deep);
  color: #ffffff;
}

.featured-tool p {
  color: #b9ced8;
}

.featured-tool .text-link {
  color: #5eead4;
}

.finance-links {
  border-top: 1px solid var(--line);
}

.compact-heading {
  margin-bottom: 24px;
}

.link-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: 1px solid var(--line);
}

.link-list a {
  border-bottom: 1px solid var(--line);
  padding: 14px 12px 14px 0;
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 700;
}

.link-list a:hover,
.link-list a:focus-visible {
  color: var(--teal-dark);
}

.faq-list {
  margin-top: 38px;
  border-top: 1px solid var(--line);
}

.faq-list details {
  border-bottom: 1px solid var(--line);
  padding-block: 19px;
}

.faq-list summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  cursor: pointer;
  font-weight: 800;
  list-style: none;
}

.faq-list summary::-webkit-details-marker {
  display: none;
}

.faq-list summary::after {
  content: "+";
  width: 28px;
  height: 28px;
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 50%;
  color: var(--teal-dark);
}

.faq-list details[open] summary::after {
  content: "-";
}

.faq-list details p {
  max-width: 760px;
  margin: 13px 0 0;
  color: var(--ink-soft);
}

.site-footer {
  background: var(--navy-deep);
  color: #d9e7ed;
  padding-top: 62px;
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(240px, 0.8fr) minmax(0, 1.2fr);
  gap: 70px;
  padding-bottom: 52px;
}

.footer-brand {
  color: #ffffff;
}

.footer-grid > div > p {
  max-width: 300px;
  color: #9fb8c5;
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 28px;
}

.footer-nav h2 {
  margin: 0 0 14px;
  color: #ffffff;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.footer-nav a {
  display: block;
  margin-block: 9px;
  color: #a9c3cf;
  text-decoration: none;
  font-size: 0.86rem;
}

.footer-nav a:hover,
.footer-nav a:focus-visible {
  color: #5eead4;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-block: 20px;
  color: #86a3b2;
  font-size: 0.76rem;
}

.footer-bottom p {
  margin: 0;
}

:focus-visible {
  outline: 3px solid var(--orange);
  outline-offset: 3px;
}

@media (max-width: 980px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 42px;
  }

  .quick-example {
    max-width: 520px;
  }

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

  .input-column {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .three-fields {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .comparison-grid {
    grid-template-columns: 1fr;
    gap: 38px;
  }

  .tool-grid,
  .link-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 760px) {
  .wrap,
  .narrow-wrap {
    width: min(100% - 28px, 1180px);
  }

  .site-nav {
    min-height: 64px;
  }

  .brand {
    font-size: 0.92rem;
  }

  .brand-mark {
    width: 30px;
    height: 30px;
  }

  .nav-links {
    display: none;
  }

  .theme-toggle {
    margin-left: auto;
  }

  .hero-grid {
    min-height: 0;
    padding-block: 58px 62px;
  }

  .hero h1 {
    font-size: clamp(3rem, 17vw, 5rem);
  }

  .calculator-section,
  .content-section,
  .comparison-section,
  .tools-section,
  .finance-links,
  .faq-section {
    padding-block: 64px;
  }

  .section-heading,
  .calculator-heading {
    display: grid;
    align-items: start;
  }

  .currency-control {
    width: min(100%, 240px);
  }

  .currency-control select {
    width: 100%;
  }

  .mode-tabs {
    display: flex;
    overflow-x: auto;
    scrollbar-width: thin;
  }

  .mode-tab {
    flex: 0 0 auto;
    min-width: 132px;
  }

  .field-grid,
  .three-fields {
    grid-template-columns: 1fr;
  }

  .formula-item,
  .tool-grid,
  .link-list,
  .footer-grid,
  .footer-nav {
    grid-template-columns: 1fr;
  }

  .formula-item {
    gap: 16px;
  }

  .tool-card {
    min-height: 220px;
  }

  .footer-grid {
    gap: 38px;
  }
}

@media (max-width: 480px) {
  .quick-example {
    padding: 22px;
  }

  .quick-equation {
    grid-template-columns: 1fr;
    gap: 2px;
  }

  .quick-equation span:nth-child(2) {
    display: none;
  }

  .input-column,
  .result-column {
    padding: 24px 20px;
  }

  .primary-result > span {
    font-size: 2.75rem;
  }

  .footer-bottom {
    display: grid;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}