:root {
  color-scheme: dark;
  --bg: #07120f;
  --bg-elevated: #0b1b16;
  --surface: #0e211a;
  --surface-strong: #132a22;
  --surface-soft: rgba(255, 255, 255, 0.035);
  --text: #f1f7f3;
  --muted: #a8bbb0;
  --faint: #74887d;
  --line: rgba(210, 236, 220, 0.13);
  --line-strong: rgba(210, 236, 220, 0.22);
  --green: #62e5a5;
  --green-strong: #39c989;
  --green-ink: #052217;
  --gold: #e7c66a;
  --danger: #ff8f8f;
  --shadow: 0 28px 80px rgba(0, 0, 0, 0.32);
  --radius-lg: 26px;
  --radius-md: 18px;
  --radius-sm: 12px;
  --max-width: 1180px;
}

html[data-theme="light"] {
  color-scheme: light;
  --bg: #f5f7f2;
  --bg-elevated: #edf3ec;
  --surface: #ffffff;
  --surface-strong: #e8f2eb;
  --surface-soft: rgba(10, 45, 29, 0.035);
  --text: #10251c;
  --muted: #4f685b;
  --faint: #71857a;
  --line: rgba(13, 54, 35, 0.13);
  --line-strong: rgba(13, 54, 35, 0.22);
  --green: #087849;
  --green-strong: #0a8e58;
  --green-ink: #f5fff9;
  --gold: #9d7311;
  --danger: #b22727;
  --shadow: 0 28px 80px rgba(28, 63, 44, 0.12);
}

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

html {
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  margin: 0;
  overflow-x: hidden;
  background:
    radial-gradient(circle at 82% 8%, rgba(61, 202, 138, 0.12), transparent 28rem),
    radial-gradient(circle at 5% 28%, rgba(231, 198, 106, 0.07), transparent 25rem),
    var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

button,
input,
select {
  font: inherit;
}

button,
a,
input,
select {
  -webkit-tap-highlight-color: transparent;
}

a {
  color: inherit;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 12px;
  left: 12px;
  padding: 10px 16px;
  transform: translateY(-150%);
  border-radius: 8px;
  background: var(--green);
  color: var(--green-ink);
  font-weight: 800;
}

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

.site-header {
  position: sticky;
  z-index: 20;
  top: 0;
  display: flex;
  width: min(calc(100% - 40px), var(--max-width));
  min-height: 76px;
  margin: 0 auto;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: var(--text);
  font-size: 0.98rem;
  font-weight: 780;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.brand svg {
  width: 34px;
  height: 34px;
  padding: 6px;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  fill: none;
  stroke: var(--green);
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 2.3;
}

nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

nav a {
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 650;
  text-decoration: none;
}

nav a:hover {
  color: var(--text);
}

.theme-toggle {
  display: grid;
  width: 40px;
  height: 40px;
  cursor: pointer;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--surface-soft);
  color: var(--muted);
}

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

.hero {
  display: grid;
  width: min(calc(100% - 40px), var(--max-width));
  min-height: 690px;
  margin: 0 auto;
  padding: 96px 0 112px;
  align-items: center;
  grid-template-columns: 1.02fr 0.98fr;
  gap: clamp(48px, 7vw, 92px);
}

.eyebrow {
  display: flex;
  margin: 0 0 20px;
  align-items: center;
  gap: 10px;
  color: var(--green);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.eyebrow span {
  width: 28px;
  height: 1px;
  background: currentColor;
}

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

h1 {
  max-width: 720px;
  margin-bottom: 26px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(3.55rem, 6.7vw, 6rem);
  font-weight: 500;
  letter-spacing: -0.055em;
  line-height: 0.95;
}

h1 em {
  color: var(--green);
  font-weight: inherit;
}

.hero-intro {
  max-width: 610px;
  margin-bottom: 34px;
  color: var(--muted);
  font-size: clamp(1rem, 1.6vw, 1.13rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.button {
  display: inline-flex;
  min-height: 50px;
  padding: 0 20px;
  align-items: center;
  justify-content: center;
  gap: 14px;
  border: 1px solid var(--line-strong);
  border-radius: 12px;
  font-size: 0.9rem;
  font-weight: 780;
  text-decoration: none;
}

.button-primary {
  border-color: var(--green);
  background: var(--green);
  color: var(--green-ink);
}

.button-primary:hover {
  background: var(--green-strong);
}

.button-secondary:hover {
  background: var(--surface-soft);
}

.trust-list {
  display: flex;
  margin: 38px 0 0;
  padding: 24px 0 0;
  border-top: 1px solid var(--line);
  color: var(--faint);
  font-size: 0.76rem;
  list-style: none;
  gap: 28px;
}

.trust-list strong {
  display: block;
  color: var(--text);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.28rem;
  font-weight: 500;
}

.hero-visual {
  position: relative;
  padding: 24px 24px 17px;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(145deg, rgba(98, 229, 165, 0.07), transparent 40%),
    var(--bg-elevated);
  box-shadow: var(--shadow);
}

.hero-visual::after {
  position: absolute;
  z-index: -1;
  right: -70px;
  bottom: -70px;
  width: 210px;
  height: 210px;
  border-radius: 50%;
  background: var(--green);
  content: "";
  filter: blur(100px);
  opacity: 0.16;
}

.visual-topline,
.visual-legend {
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--faint);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.status {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--green);
}

.status i {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
  box-shadow: 0 0 12px currentColor;
}

.visual-metric {
  margin-top: 44px;
}

.visual-metric small {
  display: block;
  margin-bottom: 2px;
  color: var(--muted);
  font-size: 0.8rem;
}

.visual-metric strong {
  display: block;
  margin-bottom: 2px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(2rem, 4vw, 3.2rem);
  font-weight: 500;
  letter-spacing: -0.04em;
  line-height: 1.1;
}

.visual-metric span {
  color: var(--green);
  font-size: 0.8rem;
  font-weight: 750;
}

.hero-chart {
  display: block;
  width: 100%;
  height: auto;
  margin-top: 20px;
  overflow: visible;
}

.chart-grid path {
  fill: none;
  stroke: var(--line);
  stroke-width: 1;
}

.chart-area {
  fill: url(#area-fill);
}

.chart-line {
  fill: none;
  stroke: var(--green);
  stroke-linecap: round;
  stroke-width: 3.5;
}

.chart-points circle {
  fill: var(--bg-elevated);
  stroke: var(--green);
  stroke-width: 3;
}

.calculator-section {
  padding: 110px max(20px, calc((100% - var(--max-width)) / 2));
  background: var(--bg-elevated);
}

.section-heading {
  display: flex;
  margin-bottom: 42px;
  align-items: end;
  justify-content: space-between;
  gap: 30px;
}

h2 {
  max-width: 720px;
  margin-bottom: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(2.4rem, 5vw, 4.25rem);
  font-weight: 500;
  letter-spacing: -0.045em;
  line-height: 1.02;
}

.currency-control {
  display: grid;
  min-width: 190px;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 750;
  gap: 7px;
  text-transform: uppercase;
}

select,
input {
  width: 100%;
  min-height: 48px;
  padding: 10px 13px;
  border: 1px solid var(--line);
  border-radius: 10px;
  outline: none;
  background: var(--surface-soft);
  color: var(--text);
}

select:focus,
input:focus {
  border-color: var(--green);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--green) 16%, transparent);
}

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

.calculator-card {
  display: flex;
  min-width: 0;
  padding: clamp(24px, 4vw, 36px);
  flex-direction: column;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
}

.calculator-card-wide {
  grid-column: 1 / -1;
}

.card-heading {
  display: flex;
  margin-bottom: 30px;
  gap: 15px;
}

.card-number {
  flex: 0 0 auto;
  padding-top: 5px;
  color: var(--green);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.72rem;
  font-weight: 800;
}

h3 {
  margin-bottom: 4px;
  font-size: 1.22rem;
  letter-spacing: -0.025em;
}

.card-heading p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.86rem;
}

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

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

.four-fields {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.field-grid label {
  display: grid;
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 720;
  gap: 7px;
}

.calculate-button {
  width: 100%;
  min-height: 48px;
  margin-top: 16px;
  cursor: pointer;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  background: var(--surface-strong);
  color: var(--text);
  font-size: 0.83rem;
  font-weight: 800;
}

.calculate-button:hover {
  border-color: var(--green);
  color: var(--green);
}

.result-panel {
  margin-top: 18px;
  padding: 18px;
  border: 1px solid color-mix(in srgb, var(--green) 35%, var(--line));
  border-radius: 12px;
  background: color-mix(in srgb, var(--green) 7%, var(--surface));
}

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

.result-label {
  display: block;
  margin-bottom: 3px;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 750;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.result-value {
  display: block;
  overflow-wrap: anywhere;
  color: var(--green);
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 500;
  letter-spacing: -0.035em;
  line-height: 1.15;
}

.result-note {
  margin: 9px 0 0;
  color: var(--muted);
  font-size: 0.78rem;
}

.error-result {
  border-color: color-mix(in srgb, var(--danger) 45%, var(--line));
  background: color-mix(in srgb, var(--danger) 7%, var(--surface));
  color: var(--danger);
  font-size: 0.86rem;
  font-weight: 700;
}

.formula {
  margin: auto 0 0;
  padding-top: 20px;
  color: var(--faint);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.67rem;
}

.formula strong {
  margin-right: 8px;
  color: var(--muted);
  text-transform: uppercase;
}

.projection-summary {
  display: grid;
  margin-bottom: 18px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.summary-item {
  padding: 12px;
  border-radius: 9px;
  background: var(--surface-soft);
}

.summary-item span {
  display: block;
  color: var(--faint);
  font-size: 0.69rem;
  font-weight: 700;
  text-transform: uppercase;
}

.summary-item strong {
  overflow-wrap: anywhere;
  color: var(--text);
  font-size: 0.95rem;
}

.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.78rem;
}

th,
td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--line);
  text-align: right;
  white-space: nowrap;
}

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

th {
  color: var(--faint);
  font-size: 0.66rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

tbody tr:last-child td {
  border-bottom: 0;
}

.about-section {
  display: grid;
  width: min(calc(100% - 40px), var(--max-width));
  margin: 0 auto;
  padding: 120px 0;
  grid-template-columns: 1fr 0.9fr;
  gap: clamp(60px, 10vw, 130px);
}

.about-section > div > p:last-child {
  max-width: 580px;
  margin: 28px 0 0;
  color: var(--muted);
}

.principle-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.principle-list li {
  display: flex;
  padding: 25px 0;
  border-bottom: 1px solid var(--line);
  gap: 18px;
}

.principle-list li:first-child {
  padding-top: 0;
}

.principle-list > li > span {
  color: var(--green);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.72rem;
}

.principle-list strong {
  font-size: 0.96rem;
}

.principle-list p {
  margin: 3px 0 0;
  color: var(--muted);
  font-size: 0.82rem;
}

footer {
  display: flex;
  width: min(calc(100% - 40px), var(--max-width));
  margin: 0 auto;
  padding: 30px 0 44px;
  justify-content: space-between;
  border-top: 1px solid var(--line);
  color: var(--faint);
  font-size: 0.74rem;
  gap: 20px;
}

footer p {
  margin: 0;
}

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

.noscript {
  position: fixed;
  z-index: 50;
  right: 20px;
  bottom: 20px;
  padding: 14px;
  border-radius: 10px;
  background: var(--danger);
  color: #fff;
}

@media (max-width: 900px) {
  nav a {
    display: none;
  }

  .hero {
    min-height: auto;
    padding: 80px 0 92px;
    grid-template-columns: 1fr;
  }

  .hero-copy {
    max-width: 720px;
  }

  .hero-visual {
    max-width: 680px;
  }

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

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

@media (max-width: 690px) {
  .site-header,
  .hero,
  .about-section,
  footer {
    width: min(calc(100% - 28px), var(--max-width));
  }

  .site-header {
    min-height: 66px;
  }

  .brand span {
    font-size: 0.9rem;
  }

  .hero {
    padding: 65px 0 78px;
    gap: 45px;
  }

  h1 {
    font-size: clamp(3rem, 16vw, 4.7rem);
  }

  .trust-list {
    gap: 18px;
  }

  .visual-topline .status {
    display: none;
  }

  .calculator-section {
    padding-top: 80px;
    padding-bottom: 80px;
  }

  .section-heading {
    align-items: stretch;
    flex-direction: column;
  }

  .currency-control {
    max-width: none;
  }

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

  .calculator-card-wide {
    grid-column: auto;
  }

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

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

  .about-section {
    padding: 85px 0;
  }

  footer {
    align-items: flex-start;
    flex-direction: column;
  }
}

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

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