:root {
  --bg: #f7fbfb;
  --surface: #ffffff;
  --surface-strong: #eefdfa;
  --text: #102027;
  --muted: #53656d;
  --border: #dbe8e7;
  --primary: #0f766e;
  --primary-dark: #0b5f59;
  --accent: #2563eb;
  --warning: #f59e0b;
  --good: #0f766e;
  --shadow: 0 18px 45px rgba(15, 23, 42, 0.08);
  --radius-lg: 28px;
  --radius-md: 18px;
  --radius-sm: 12px;
  --container: 1180px;
  --font: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

[data-theme="dark"] {
  --bg: #071316;
  --surface: #0d1f23;
  --surface-strong: #123337;
  --text: #ecfeff;
  --muted: #abc2c5;
  --border: #244449;
  --primary: #2dd4bf;
  --primary-dark: #14b8a6;
  --accent: #60a5fa;
  --shadow: 0 18px 45px rgba(0, 0, 0, 0.3);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

body.nav-open {
  overflow: hidden;
}

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

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

button, input, select {
  font: inherit;
}

.container {
  width: min(100% - 32px, var(--container));
  margin-inline: auto;
}

.section-pad {
  padding: 76px 0;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 10px;
  z-index: 999;
  background: var(--text);
  color: var(--surface);
  padding: 10px 14px;
  border-radius: var(--radius-sm);
}

.skip-link:focus {
  left: 10px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(247, 251, 251, 0.86);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}

[data-theme="dark"] .site-header {
  background: rgba(7, 19, 22, 0.86);
}

.header-inner {
  min-height: 74px;
  display: flex;
  align-items: center;
  gap: 18px;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.logo-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 12px;
  background: var(--primary);
  color: white;
  font-weight: 900;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-left: auto;
  color: var(--muted);
  font-size: 0.95rem;
  font-weight: 650;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--primary);
}

.header-cta,
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  border: 0;
  border-radius: 999px;
  padding: 0 18px;
  font-weight: 800;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.header-cta,
.button.primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 10px 24px rgba(15, 118, 110, 0.22);
}

.header-cta:hover,
.button:hover {
  transform: translateY(-1px);
}

.button.secondary {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
}

.button.ghost {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--border);
}

.theme-toggle,
.nav-toggle {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  border-radius: 999px;
  min-height: 42px;
  padding: 0 14px;
  font-weight: 800;
  cursor: pointer;
}

.nav-toggle {
  display: none;
  margin-left: auto;
}

.hero {
  background:
    radial-gradient(circle at top left, rgba(45, 212, 191, 0.18), transparent 34%),
    linear-gradient(180deg, var(--surface-strong), var(--bg));
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(320px, 0.7fr);
  gap: 42px;
  align-items: center;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--primary);
  font-size: 0.78rem;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

h1, h2, h3 {
  margin: 0;
  line-height: 1.1;
  letter-spacing: -0.04em;
}

h1 {
  font-size: clamp(2.45rem, 6vw, 5rem);
  max-width: 920px;
}

h2 {
  font-size: clamp(2rem, 4vw, 3.1rem);
}

h3 {
  font-size: 1.35rem;
}

.hero-subtitle {
  margin: 22px 0 0;
  max-width: 760px;
  font-size: clamp(1.2rem, 2vw, 1.55rem);
  color: var(--text);
}

.hero-text,
.section-heading p,
.content-section p,
.reverse-section p,
.footer-grid p {
  color: var(--muted);
}

.hero-text {
  max-width: 740px;
  font-size: 1.05rem;
}

.hero-actions,
.form-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 26px;
}

.trust-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.trust-row span {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 8px 12px;
  color: var(--muted);
  font-weight: 750;
  font-size: 0.9rem;
}

.hero-card,
.calculator-card,
.results-panel,
.reverse-card,
.content-grid article,
.faq-list details {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

.hero-card {
  padding: 28px;
}

.card-label,
.microcopy {
  color: var(--muted);
  margin: 0;
}

.preview-row {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 0;
  border-bottom: 1px solid var(--border);
}

.preview-row strong {
  font-size: 1.35rem;
}

.preview-row.highlight {
  color: var(--primary);
}

.microcopy {
  margin-top: 18px;
}

.ad-placeholder {
  display: grid;
  place-items: center;
  min-height: 92px;
  margin: 28px 0;
  border: 1px dashed var(--border);
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--surface) 80%, var(--bg));
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 850;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.section-heading {
  margin-bottom: 34px;
}

.section-heading.narrow {
  max-width: 820px;
}

.calculator-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 420px;
  gap: 24px;
  align-items: start;
}

.calculator-card {
  padding: 24px;
}

.form-section {
  padding: 22px 0;
  border-bottom: 1px solid var(--border);
}

.form-section:first-child {
  padding-top: 0;
}

.form-section:last-of-type {
  border-bottom: 0;
}

.form-section-heading {
  margin-bottom: 18px;
}

.form-section-heading p {
  margin: 8px 0 0;
  color: var(--muted);
}

.input-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

label {
  display: grid;
  gap: 7px;
}

label span,
.checkbox-label {
  font-weight: 800;
}

small {
  color: var(--muted);
  font-size: 0.82rem;
}

input,
select {
  width: 100%;
  min-height: 48px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  color: var(--text);
  padding: 10px 12px;
  outline: none;
}

input:focus,
select:focus,
button:focus-visible,
a:focus-visible,
summary:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--primary) 28%, transparent);
  outline-offset: 2px;
}

.checkbox-label {
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 10px;
  min-height: 48px;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
}

.checkbox-label input {
  width: 20px;
  min-height: 20px;
}

.results-panel {
  padding: 20px;
}

.sticky-summary {
  position: sticky;
  top: 94px;
}

.results-topline {
  margin-bottom: 18px;
}

.big-result {
  display: grid;
  gap: 6px;
  padding: 20px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  box-shadow: 0 14px 28px rgba(15, 118, 110, 0.24);
}

.big-result span {
  opacity: 0.9;
  font-weight: 750;
}

.big-result strong {
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1;
}

.goal-message {
  margin: 14px 0;
  padding: 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--muted);
  font-weight: 750;
}

.goal-message.good {
  border-color: color-mix(in srgb, var(--good) 45%, var(--border));
  color: var(--good);
}

.goal-message.warn {
  border-color: color-mix(in srgb, var(--warning) 55%, var(--border));
  color: var(--warning);
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.result-card {
  display: grid;
  gap: 6px;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
}

.result-card span,
.reverse-results span {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 750;
}

.result-card strong,
.reverse-results strong {
  font-size: 1.2rem;
}

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

.disclaimer {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.reverse-section {
  background: linear-gradient(180deg, var(--bg), var(--surface-strong));
}

.reverse-grid {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 28px;
  align-items: start;
}

.reverse-card {
  padding: 24px;
}

.reverse-results {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 18px;
}

.reverse-results div {
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
}

.content-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}

.content-grid article {
  padding: 26px;
}

.content-grid h2 + p,
.content-grid h2 + ol,
.content-grid h2 + ul {
  margin-top: 16px;
}

.check-list,
.number-list,
.footer-grid ul {
  margin: 16px 0 0;
  padding-left: 20px;
  color: var(--muted);
}

.check-list li,
.number-list li {
  margin-bottom: 8px;
}

.faq-list {
  display: grid;
  gap: 12px;
}

.faq-list details {
  padding: 0;
  overflow: hidden;
}

.faq-list summary {
  cursor: pointer;
  padding: 20px 22px;
  font-weight: 900;
}

.faq-list details p {
  margin: 0;
  padding: 0 22px 20px;
  color: var(--muted);
}

.site-footer {
  padding: 52px 0 26px;
  background: #081a1f;
  color: #e6fffb;
}

.site-footer .logo-mark {
  background: #2dd4bf;
  color: #062022;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr 1fr;
  gap: 28px;
}

.footer-grid h2 {
  font-size: 1rem;
  letter-spacing: 0;
}

.footer-grid p,
.footer-grid li {
  color: #b9d3d2;
}

.footer-ad {
  min-height: 74px;
  margin: 14px 0 0;
  border-color: rgba(255,255,255,0.25);
  color: #b9d3d2;
  background: rgba(255,255,255,0.04);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  margin-top: 32px;
  padding-top: 22px;
  border-top: 1px solid rgba(255,255,255,0.15);
  color: #b9d3d2;
  font-size: 0.9rem;
}

.toast {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 80;
  padding: 12px 16px;
  border-radius: 999px;
  background: var(--text);
  color: var(--surface);
  box-shadow: var(--shadow);
  transform: translateY(120%);
  transition: transform 0.25s ease;
}

.toast.show {
  transform: translateY(0);
}

@media (max-width: 1040px) {
  .header-cta {
    display: none;
  }

  .calculator-layout,
  .hero-grid,
  .reverse-grid {
    grid-template-columns: 1fr;
  }

  .sticky-summary {
    position: static;
  }
}

@media (max-width: 820px) {
  .nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .site-nav {
    position: fixed;
    inset: 74px 16px auto 16px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    margin: 0;
    padding: 18px;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: var(--surface);
    box-shadow: var(--shadow);
  }

  body.nav-open .site-nav {
    display: flex;
  }

  .theme-toggle {
    padding: 0 12px;
  }

  .section-pad {
    padding: 56px 0;
  }

  .input-grid,
  .result-grid,
  .reverse-results,
  .content-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .footer-bottom {
    flex-direction: column;
  }
}

@media (max-width: 560px) {
  .container {
    width: min(100% - 22px, var(--container));
  }

  .header-inner {
    gap: 10px;
  }

  .logo span:last-child {
    max-width: 140px;
    line-height: 1.1;
  }

  .hero-actions,
  .form-actions {
    flex-direction: column;
  }

  .button,
  .header-cta {
    width: 100%;
  }

  .calculator-card,
  .results-panel,
  .reverse-card,
  .content-grid article,
  .hero-card {
    border-radius: 20px;
    padding: 18px;
  }
}

@media print {
  .site-header,
  .hero,
  .ad-placeholder,
  .form-actions,
  .content-section,
  .faq-section,
  .site-footer,
  .toast,
  .reverse-section {
    display: none !important;
  }

  body {
    background: #fff;
    color: #000;
  }

  .calculator-layout {
    display: block;
  }

  .calculator-card {
    display: none;
  }

  .results-panel {
    box-shadow: none;
    border: 1px solid #999;
  }
}

.noscript-warning {
  display: block;
  padding: 12px 16px;
  background: #fff7ed;
  color: #7c2d12;
  border-bottom: 1px solid #fed7aa;
  text-align: center;
  font-weight: 750;
}