:root {
  color-scheme: light;
  --bg: #f4f7fb;
  --bg-accent: #e8f4f2;
  --surface: #ffffff;
  --surface-raised: #ffffff;
  --surface-muted: #f0f4f8;
  --surface-strong: #e6edf4;
  --text: #10233f;
  --text-strong: #07172d;
  --muted: #5b6b80;
  --muted-strong: #42536a;
  --border: #d9e2ec;
  --border-strong: #bdc9d8;
  --brand: #0f766e;
  --brand-strong: #0a5c56;
  --brand-soft: #dff4f0;
  --accent: #d97706;
  --accent-soft: #fff1d6;
  --success: #19734c;
  --success-soft: #e3f6ec;
  --warning: #9a5b00;
  --warning-soft: #fff4d6;
  --danger: #b4232c;
  --danger-soft: #fdebed;
  --neutral-soft: #edf2f7;
  --focus: #2563eb;
  --shadow-sm: 0 1px 2px rgba(15, 35, 63, 0.06), 0 1px 3px rgba(15, 35, 63, 0.08);
  --shadow-md: 0 12px 32px rgba(15, 35, 63, 0.10), 0 2px 8px rgba(15, 35, 63, 0.05);
  --shadow-lg: 0 24px 64px rgba(15, 35, 63, 0.14), 0 4px 16px rgba(15, 35, 63, 0.06);
  --radius-sm: 0.6rem;
  --radius-md: 1rem;
  --radius-lg: 1.45rem;
  --radius-xl: 2rem;
  --container: 1180px;
  --header-height: 4.5rem;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #081321;
  --bg-accent: #0b282a;
  --surface: #0e1b2c;
  --surface-raised: #132238;
  --surface-muted: #14243a;
  --surface-strong: #1b2c43;
  --text: #e8eef7;
  --text-strong: #ffffff;
  --muted: #a8b5c7;
  --muted-strong: #c1ccda;
  --border: #263a53;
  --border-strong: #3c526d;
  --brand: #52c7b8;
  --brand-strong: #7ad9cd;
  --brand-soft: #143b3a;
  --accent: #f4b54b;
  --accent-soft: #3a2c13;
  --success: #5bd09a;
  --success-soft: #14382a;
  --warning: #f2bc55;
  --warning-soft: #3a2e16;
  --danger: #ff8b92;
  --danger-soft: #421f27;
  --neutral-soft: #1a2a40;
  --focus: #7aa8ff;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.24), 0 1px 3px rgba(0, 0, 0, 0.18);
  --shadow-md: 0 12px 32px rgba(0, 0, 0, 0.28), 0 2px 8px rgba(0, 0, 0, 0.20);
  --shadow-lg: 0 24px 64px rgba(0, 0, 0, 0.38), 0 4px 16px rgba(0, 0, 0, 0.22);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 1.5rem);
  text-size-adjust: 100%;
}

body {
  margin: 0;
  min-width: 320px;
  background:
    radial-gradient(circle at 8% 0%, color-mix(in srgb, var(--brand-soft) 58%, transparent), transparent 28rem),
    radial-gradient(circle at 92% 8%, color-mix(in srgb, var(--accent-soft) 48%, transparent), transparent 26rem),
    var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 1rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img,
svg {
  display: block;
  max-width: 100%;
}

a {
  color: var(--brand-strong);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--brand);
}

button,
input,
select,
textarea {
  font: inherit;
}

button,
select {
  cursor: pointer;
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
summary:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--focus) 60%, transparent);
  outline-offset: 3px;
}

::selection {
  background: color-mix(in srgb, var(--brand) 30%, transparent);
}

[hidden] {
  display: none !important;
}

.skip-link {
  position: fixed;
  z-index: 9999;
  top: 0.5rem;
  left: 0.5rem;
  transform: translateY(-160%);
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  background: var(--text-strong);
  color: var(--surface);
  font-weight: 700;
  text-decoration: none;
  transition: transform 160ms ease;
}

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

.container {
  width: min(var(--container), calc(100% - 2rem));
  margin-inline: auto;
}

.narrow {
  width: min(780px, calc(100% - 2rem));
  margin-inline: auto;
}

.section {
  padding-block: clamp(4rem, 7vw, 7rem);
}

.section-tight {
  padding-block: clamp(2.75rem, 5vw, 4.5rem);
}

.section-muted {
  border-block: 1px solid color-mix(in srgb, var(--border) 80%, transparent);
  background: color-mix(in srgb, var(--surface-muted) 70%, transparent);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0 0 0.85rem;
  color: var(--brand-strong);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  line-height: 1.2;
  text-transform: uppercase;
}

.eyebrow::before {
  width: 1.5rem;
  height: 2px;
  background: currentColor;
  content: "";
}

h1,
h2,
h3,
h4 {
  margin: 0;
  color: var(--text-strong);
  font-weight: 780;
  letter-spacing: -0.035em;
  line-height: 1.12;
  text-wrap: balance;
}

h1 {
  font-size: clamp(2.65rem, 6vw, 5.3rem);
}

h2 {
  font-size: clamp(2rem, 4vw, 3.35rem);
}

h3 {
  font-size: clamp(1.25rem, 2vw, 1.65rem);
}

h4 {
  font-size: 1.05rem;
  letter-spacing: -0.015em;
}

p {
  margin: 0;
}

p + p {
  margin-top: 1rem;
}

.lede {
  max-width: 780px;
  color: var(--muted-strong);
  font-size: clamp(1.08rem, 1.7vw, 1.32rem);
  line-height: 1.7;
}

.small,
.help-text,
.source-note {
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.55;
}

.kicker {
  color: var(--muted-strong);
  font-size: 1.05rem;
  font-weight: 650;
}

.site-header {
  position: sticky;
  z-index: 1000;
  top: 0;
  height: var(--header-height);
  border-bottom: 1px solid color-mix(in srgb, var(--border) 72%, transparent);
  background: color-mix(in srgb, var(--surface) 84%, transparent);
  backdrop-filter: blur(18px) saturate(150%);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
  gap: 0.7rem;
  color: var(--text-strong);
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.brand img {
  width: 2.25rem;
  height: 2.25rem;
}

.site-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.15rem;
}

.site-nav a {
  padding: 0.62rem 0.74rem;
  border-radius: 0.65rem;
  color: var(--muted-strong);
  font-size: 0.86rem;
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  background: var(--brand-soft);
  color: var(--brand-strong);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.icon-button,
.nav-toggle {
  display: inline-grid;
  width: 2.55rem;
  height: 2.55rem;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  background: var(--surface);
  color: var(--text-strong);
  box-shadow: var(--shadow-sm);
  font-weight: 800;
}

.icon-button:hover,
.nav-toggle:hover {
  border-color: var(--border-strong);
  background: var(--surface-muted);
}

.nav-toggle {
  display: none;
  padding: 0;
}

.nav-toggle span,
.nav-toggle::before,
.nav-toggle::after {
  display: block;
  width: 1.1rem;
  height: 2px;
  border-radius: 1rem;
  background: currentColor;
  content: "";
  transition: transform 160ms ease, opacity 160ms ease;
}

.nav-toggle span {
  margin-block: 0.24rem;
}

.nav-toggle[aria-expanded="true"] span {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"]::before {
  transform: translateY(6px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"]::after {
  transform: translateY(-6px) rotate(-45deg);
}

.hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(4.75rem, 9vw, 8.25rem) clamp(4rem, 7vw, 6rem);
}

.hero::after {
  position: absolute;
  z-index: -1;
  right: -11rem;
  bottom: -12rem;
  width: 34rem;
  height: 34rem;
  border: 1px solid color-mix(in srgb, var(--brand) 18%, transparent);
  border-radius: 50%;
  box-shadow:
    0 0 0 3.5rem color-mix(in srgb, var(--brand) 4%, transparent),
    0 0 0 7rem color-mix(in srgb, var(--brand) 3%, transparent);
  content: "";
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(310px, 0.65fr);
  align-items: center;
  gap: clamp(2.5rem, 7vw, 6rem);
}

.hero-copy h1 {
  max-width: 880px;
}

.hero-copy .lede {
  margin-top: 1.5rem;
}

.hero-actions,
.result-actions,
.form-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
}

.hero-actions {
  margin-top: 2rem;
}

.button {
  display: inline-flex;
  min-height: 2.9rem;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  padding: 0.72rem 1rem;
  border: 1px solid transparent;
  border-radius: 0.78rem;
  background: var(--brand);
  color: #ffffff;
  font-size: 0.93rem;
  font-weight: 780;
  line-height: 1.2;
  text-decoration: none;
  box-shadow: 0 8px 18px color-mix(in srgb, var(--brand) 24%, transparent);
  transition: transform 140ms ease, background 140ms ease, border-color 140ms ease, box-shadow 140ms ease;
}

.button:hover {
  transform: translateY(-1px);
  background: var(--brand-strong);
  color: #ffffff;
  box-shadow: 0 10px 24px color-mix(in srgb, var(--brand) 30%, transparent);
}

.button-secondary {
  border-color: var(--border);
  background: var(--surface);
  color: var(--text-strong);
  box-shadow: var(--shadow-sm);
}

.button-secondary:hover {
  border-color: var(--border-strong);
  background: var(--surface-muted);
  color: var(--text-strong);
  box-shadow: var(--shadow-sm);
}

.button-quiet {
  border-color: transparent;
  background: transparent;
  color: var(--brand-strong);
  box-shadow: none;
}

.button-quiet:hover {
  background: var(--brand-soft);
  color: var(--brand-strong);
  box-shadow: none;
}

.button-small {
  min-height: 2.35rem;
  padding: 0.55rem 0.75rem;
  font-size: 0.82rem;
}

.trust-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 2rem;
}

.trust-pill,
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.42rem;
  padding: 0.45rem 0.7rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: color-mix(in srgb, var(--surface) 82%, transparent);
  color: var(--muted-strong);
  font-size: 0.78rem;
  font-weight: 700;
  line-height: 1.2;
}

.trust-pill::before {
  color: var(--success);
  content: "✓";
}

.hero-card {
  position: relative;
  padding: 1.4rem;
  border: 1px solid color-mix(in srgb, var(--brand) 22%, var(--border));
  border-radius: var(--radius-xl);
  background:
    linear-gradient(145deg, color-mix(in srgb, var(--surface-raised) 96%, var(--brand-soft)), var(--surface-raised));
  box-shadow: var(--shadow-lg);
}

.hero-card::before {
  position: absolute;
  top: -0.6rem;
  right: 1.5rem;
  width: 5.4rem;
  height: 1.2rem;
  border-radius: 999px;
  background: var(--accent);
  content: "";
  opacity: 0.8;
  filter: blur(16px);
}

.hero-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

.hero-card-header span {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 700;
}

.hero-flow {
  display: grid;
  gap: 0.8rem;
  margin-top: 1rem;
}

.hero-flow-step {
  display: grid;
  grid-template-columns: 2.25rem 1fr auto;
  align-items: center;
  gap: 0.75rem;
  padding: 0.85rem;
  border: 1px solid var(--border);
  border-radius: 0.9rem;
  background: var(--surface);
}

.hero-flow-step strong {
  color: var(--text-strong);
  font-size: 0.94rem;
}

.hero-flow-step small {
  display: block;
  color: var(--muted);
  font-size: 0.74rem;
}

.step-number {
  display: grid;
  width: 2.25rem;
  height: 2.25rem;
  place-items: center;
  border-radius: 0.7rem;
  background: var(--brand-soft);
  color: var(--brand-strong);
  font-size: 0.82rem;
  font-weight: 850;
}

.flow-arrow {
  color: var(--border-strong);
  font-size: 1.2rem;
}

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 2rem;
  margin-bottom: clamp(2rem, 4vw, 3.25rem);
}

.section-heading-copy {
  max-width: 790px;
}

.section-heading p:not(.eyebrow) {
  margin-top: 1rem;
  color: var(--muted-strong);
  font-size: 1.05rem;
}

.calculator-shell {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(340px, 0.9fr);
  align-items: start;
  gap: clamp(1.2rem, 3vw, 2rem);
}

.form-card,
.result-card,
.content-card,
.tool-card,
.info-card {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface-raised);
  box-shadow: var(--shadow-sm);
}

.form-card,
.result-card {
  padding: clamp(1.15rem, 3vw, 2rem);
}

.result-card {
  position: sticky;
  top: calc(var(--header-height) + 1rem);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.result-card::before {
  position: absolute;
  top: 0;
  right: 0;
  left: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--brand), var(--accent));
  content: "";
}

.card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.35rem;
}

.card-header p {
  margin-top: 0.35rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.privacy-chip {
  display: inline-flex;
  flex-shrink: 0;
  align-items: center;
  gap: 0.35rem;
  padding: 0.36rem 0.55rem;
  border-radius: 999px;
  background: var(--success-soft);
  color: var(--success);
  font-size: 0.72rem;
  font-weight: 800;
  line-height: 1.2;
}

.privacy-chip::before {
  content: "●";
  font-size: 0.58rem;
}

.form-section + .form-section {
  margin-top: 1.6rem;
  padding-top: 1.6rem;
  border-top: 1px solid var(--border);
}

.form-section-title {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin-bottom: 1rem;
  color: var(--text-strong);
  font-size: 0.91rem;
  font-weight: 820;
  letter-spacing: 0.015em;
}

.form-section-title span {
  display: inline-grid;
  width: 1.65rem;
  height: 1.65rem;
  place-items: center;
  border-radius: 0.5rem;
  background: var(--brand-soft);
  color: var(--brand-strong);
  font-size: 0.72rem;
}

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

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

.field,
.field-full {
  min-width: 0;
}

.field-full {
  grid-column: 1 / -1;
}

label,
legend {
  display: block;
  margin-bottom: 0.42rem;
  color: var(--text-strong);
  font-size: 0.84rem;
  font-weight: 760;
  line-height: 1.35;
}

label .optional {
  color: var(--muted);
  font-size: 0.73rem;
  font-weight: 600;
}

.input-wrap {
  position: relative;
}

.input-prefix,
.input-suffix {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 700;
  pointer-events: none;
}

.input-prefix {
  left: 0.82rem;
}

.input-suffix {
  right: 0.82rem;
}

.input-wrap.has-prefix input {
  padding-left: 2rem;
}

.input-wrap.has-suffix input {
  padding-right: 2.6rem;
}

input,
select,
textarea {
  width: 100%;
  min-height: 2.85rem;
  padding: 0.7rem 0.78rem;
  border: 1px solid var(--border-strong);
  border-radius: 0.72rem;
  background: var(--surface);
  color: var(--text-strong);
  box-shadow: inset 0 1px 1px color-mix(in srgb, var(--text) 4%, transparent);
  transition: border-color 140ms ease, box-shadow 140ms ease, background 140ms ease;
}

input:hover,
select:hover,
textarea:hover {
  border-color: color-mix(in srgb, var(--brand) 44%, var(--border-strong));
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--focus);
  outline: none;
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--focus) 16%, transparent);
}

input:disabled,
select:disabled {
  opacity: 0.62;
  cursor: not-allowed;
}

.help-text {
  display: block;
  margin-top: 0.35rem;
}

fieldset {
  min-width: 0;
  margin: 0;
  padding: 0;
  border: 0;
}

.segmented-control {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.55rem;
}

.segmented-option {
  position: relative;
}

.segmented-option input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
}

.segmented-option label {
  height: 100%;
  margin: 0;
  padding: 0.78rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: 0.78rem;
  background: var(--surface-muted);
  color: var(--muted-strong);
  cursor: pointer;
}

.segmented-option label strong,
.segmented-option label small {
  display: block;
}

.segmented-option label small {
  margin-top: 0.14rem;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 550;
}

.segmented-option input:checked + label {
  border-color: color-mix(in srgb, var(--brand) 60%, var(--border));
  background: var(--brand-soft);
  color: var(--brand-strong);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--brand) 12%, transparent);
}

.segmented-option input:focus-visible + label {
  outline: 3px solid color-mix(in srgb, var(--focus) 60%, transparent);
  outline-offset: 3px;
}

.input-panel {
  margin-top: 1rem;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: 0.9rem;
  background: var(--surface-muted);
}

details.advanced {
  margin-top: 1.4rem;
  border: 1px solid var(--border);
  border-radius: 0.9rem;
  background: var(--surface-muted);
}

details.advanced summary {
  padding: 0.9rem 1rem;
  color: var(--text-strong);
  font-size: 0.87rem;
  font-weight: 780;
  cursor: pointer;
}

details.advanced[open] summary {
  border-bottom: 1px solid var(--border);
}

.advanced-body {
  padding: 1rem;
}

.form-actions {
  margin-top: 1.5rem;
}

.result-kicker {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.result-hero {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: end;
  gap: 1rem;
  margin-top: 0.55rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border);
}

.result-amount {
  color: var(--text-strong);
  font-size: clamp(2.25rem, 5vw, 4rem);
  font-weight: 830;
  letter-spacing: -0.055em;
  line-height: 1;
}

.result-unit {
  margin-top: 0.35rem;
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 650;
}

.result-secondary {
  padding: 0.65rem 0.8rem;
  border-radius: 0.8rem;
  background: var(--brand-soft);
  text-align: right;
}

.result-secondary span,
.result-secondary strong {
  display: block;
}

.result-secondary span {
  color: var(--muted-strong);
  font-size: 0.7rem;
  font-weight: 700;
}

.result-secondary strong {
  margin-top: 0.15rem;
  color: var(--brand-strong);
  font-size: 1.15rem;
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
  margin-top: 1rem;
}

.result-stat {
  min-width: 0;
  padding: 0.85rem;
  border: 1px solid var(--border);
  border-radius: 0.85rem;
  background: var(--surface-muted);
}

.result-stat span,
.result-stat strong {
  display: block;
}

.result-stat span {
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 700;
  line-height: 1.35;
}

.result-stat strong {
  margin-top: 0.3rem;
  overflow-wrap: anywhere;
  color: var(--text-strong);
  font-size: 1.08rem;
  line-height: 1.2;
}

.result-breakdown {
  margin-top: 1.2rem;
}

.breakdown-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.7rem;
  color: var(--text-strong);
  font-size: 0.8rem;
  font-weight: 780;
}

.stacked-bar {
  display: flex;
  width: 100%;
  height: 0.72rem;
  overflow: hidden;
  border-radius: 999px;
  background: var(--surface-strong);
}

.stacked-bar span {
  min-width: 0;
  transition: width 220ms ease;
}

.bar-owner,
.bar-delivery {
  background: var(--brand);
}

.bar-benefits,
.bar-revisions {
  background: color-mix(in srgb, var(--brand) 55%, var(--accent));
}

.bar-overhead,
.bar-admin {
  background: var(--accent);
}

.bar-buffer,
.bar-sales {
  background: color-mix(in srgb, var(--accent) 55%, var(--border-strong));
}

.bar-travel {
  background: color-mix(in srgb, var(--brand) 45%, var(--border-strong));
}

.bar-other {
  background: var(--border-strong);
}

.breakdown-list {
  display: grid;
  gap: 0.48rem;
  margin-top: 0.8rem;
}

.breakdown-row {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 0.55rem;
  color: var(--muted-strong);
  font-size: 0.78rem;
}

.breakdown-row strong {
  color: var(--text-strong);
  font-size: 0.8rem;
}

.legend-dot {
  width: 0.58rem;
  height: 0.58rem;
  border-radius: 50%;
  background: var(--brand);
}

.legend-dot.benefits {
  background: color-mix(in srgb, var(--brand) 55%, var(--accent));
}

.legend-dot.overhead {
  background: var(--accent);
}

.legend-dot.buffer {
  background: color-mix(in srgb, var(--accent) 55%, var(--border-strong));
}


.result-disclaimer {
  margin-top: 1.15rem;
  padding: 0.9rem 1rem;
  border: 1px solid var(--border);
  border-left: 4px solid var(--warning);
  border-radius: 0.8rem;
  background: var(--surface-muted);
  color: var(--muted-strong);
  font-size: 0.79rem;
  line-height: 1.55;
}

.result-disclaimer strong {
  color: var(--text-strong);
}

.result-disclaimer a {
  font-weight: 750;
}

.result-actions {
  margin-top: 1.2rem;
  padding-top: 1.1rem;
  border-top: 1px solid var(--border);
}

.status-message {
  margin-top: 1rem;
  padding: 0.78rem 0.9rem;
  border: 1px solid transparent;
  border-radius: 0.8rem;
  font-size: 0.82rem;
  font-weight: 650;
  line-height: 1.5;
}

.status-success {
  border-color: color-mix(in srgb, var(--success) 24%, transparent);
  background: var(--success-soft);
  color: var(--success);
}

.status-warning {
  border-color: color-mix(in srgb, var(--warning) 24%, transparent);
  background: var(--warning-soft);
  color: var(--warning);
}

.status-error {
  border-color: color-mix(in srgb, var(--danger) 24%, transparent);
  background: var(--danger-soft);
  color: var(--danger);
}

.status-neutral {
  border-color: var(--border);
  background: var(--neutral-soft);
  color: var(--muted-strong);
}

.meter {
  position: relative;
  height: 0.55rem;
  margin-top: 0.85rem;
  overflow: hidden;
  border-radius: 999px;
  background: var(--surface-strong);
}

.meter::before {
  display: block;
  width: var(--meter-value, 0%);
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--brand), var(--accent));
  content: "";
  transition: width 220ms ease;
}

.data-callout {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.9rem;
  margin-top: 1.2rem;
  padding: 1rem;
  border: 1px solid color-mix(in srgb, var(--brand) 25%, var(--border));
  border-radius: 0.9rem;
  background: color-mix(in srgb, var(--brand-soft) 70%, var(--surface));
}

.data-callout-icon {
  display: grid;
  width: 2rem;
  height: 2rem;
  place-items: center;
  border-radius: 0.65rem;
  background: var(--brand);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 850;
}

.data-callout strong {
  display: block;
  color: var(--text-strong);
  font-size: 0.86rem;
}

.data-callout p {
  margin-top: 0.25rem;
  color: var(--muted-strong);
  font-size: 0.78rem;
  line-height: 1.5;
}

.tool-grid,
.feature-grid,
.content-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
}

.tool-card,
.content-card,
.info-card {
  padding: 1.25rem;
}

.tool-card {
  display: flex;
  min-height: 100%;
  flex-direction: column;
  color: inherit;
  text-decoration: none;
  transition: transform 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
}

.tool-card:hover {
  transform: translateY(-3px);
  border-color: color-mix(in srgb, var(--brand) 35%, var(--border));
  color: inherit;
  box-shadow: var(--shadow-md);
}

.tool-icon {
  display: grid;
  width: 2.7rem;
  height: 2.7rem;
  place-items: center;
  border-radius: 0.82rem;
  background: var(--brand-soft);
  color: var(--brand-strong);
  font-size: 1rem;
  font-weight: 850;
}

.tool-card h3 {
  margin-top: 1rem;
  font-size: 1.14rem;
}

.tool-card p {
  margin-top: 0.55rem;
  color: var(--muted);
  font-size: 0.88rem;
}

.tool-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin-top: auto;
  padding-top: 1rem;
  color: var(--brand-strong);
  font-size: 0.82rem;
  font-weight: 800;
}

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

.info-card h3,
.content-card h3 {
  margin-top: 0.9rem;
  font-size: 1.12rem;
}

.info-card p,
.content-card p {
  margin-top: 0.6rem;
  color: var(--muted-strong);
  font-size: 0.9rem;
}

.feature-number {
  color: var(--brand-strong);
  font-size: 0.78rem;
  font-weight: 850;
  letter-spacing: 0.1em;
}

.prose {
  color: var(--muted-strong);
}

.prose > * + * {
  margin-top: 1.2rem;
}

.prose h2 {
  margin-top: 3.2rem;
  font-size: clamp(1.7rem, 3vw, 2.35rem);
}

.prose h3 {
  margin-top: 2.25rem;
  font-size: 1.25rem;
}

.prose h4 {
  margin-top: 1.6rem;
}

.prose ul,
.prose ol {
  margin-bottom: 0;
  padding-left: 1.25rem;
}

.prose li + li {
  margin-top: 0.45rem;
}

.prose strong {
  color: var(--text-strong);
}

.prose code {
  padding: 0.12rem 0.34rem;
  border: 1px solid var(--border);
  border-radius: 0.35rem;
  background: var(--surface-muted);
  color: var(--text-strong);
  font-size: 0.88em;
}

.formula {
  overflow-x: auto;
  padding: 1rem;
  border: 1px solid var(--border);
  border-left: 4px solid var(--brand);
  border-radius: 0.75rem;
  background: var(--surface-muted);
  color: var(--text-strong);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.88rem;
  line-height: 1.65;
}

.data-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 0.9rem;
  background: var(--surface);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.86rem;
}

.data-table th,
.data-table td {
  padding: 0.85rem 0.9rem;
  border-bottom: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}

.data-table th {
  background: var(--surface-muted);
  color: var(--text-strong);
  font-size: 0.76rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.data-table tr:last-child td {
  border-bottom: 0;
}

.faq-list {
  display: grid;
  gap: 0.75rem;
  max-width: 900px;
  margin-inline: auto;
}

.faq-item {
  border: 1px solid var(--border);
  border-radius: 0.9rem;
  background: var(--surface);
  box-shadow: var(--shadow-sm);
}

.faq-item summary {
  padding: 1rem 1.15rem;
  color: var(--text-strong);
  font-weight: 760;
  cursor: pointer;
  list-style: none;
}

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

.faq-item summary::after {
  float: right;
  color: var(--brand-strong);
  content: "+";
  font-size: 1.15rem;
}

.faq-item[open] summary::after {
  content: "−";
}

.faq-answer {
  padding: 0 1.15rem 1.1rem;
  color: var(--muted-strong);
  font-size: 0.92rem;
}

.page-hero {
  padding-block: clamp(4rem, 8vw, 7rem) clamp(3rem, 6vw, 5rem);
  border-bottom: 1px solid color-mix(in srgb, var(--border) 72%, transparent);
}

.page-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 0.42fr);
  align-items: end;
  gap: 3rem;
}

.page-hero h1 {
  max-width: 900px;
  font-size: clamp(2.5rem, 5vw, 4.5rem);
}

.page-hero .lede {
  margin-top: 1.2rem;
}

.page-summary {
  padding: 1.15rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
}

.page-summary strong {
  display: block;
  color: var(--text-strong);
  font-size: 0.84rem;
}

.page-summary ul {
  margin: 0.7rem 0 0;
  padding-left: 1.15rem;
  color: var(--muted-strong);
  font-size: 0.84rem;
}

.page-summary li + li {
  margin-top: 0.32rem;
}

.notice {
  padding: 1rem 1.1rem;
  border: 1px solid var(--border);
  border-radius: 0.9rem;
  background: var(--surface-muted);
  color: var(--muted-strong);
  font-size: 0.86rem;
}

.notice strong {
  color: var(--text-strong);
}

.inline-source {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.78rem;
  font-weight: 750;
}

.sponsor-strip {
  padding: 0.75rem 1rem;
  border-block: 1px solid var(--border);
  background: var(--accent-soft);
  color: var(--warning);
  text-align: center;
  font-size: 0.8rem;
  font-weight: 700;
}

.affiliate-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
}

.affiliate-card {
  padding: 1.1rem;
  border: 1px solid var(--border);
  border-radius: 1rem;
  background: var(--surface);
}

.affiliate-card strong,
.affiliate-card span,
.affiliate-card a {
  display: block;
}

.affiliate-card span {
  margin-top: 0.35rem;
  color: var(--muted);
  font-size: 0.82rem;
}

.affiliate-card a {
  margin-top: 0.8rem;
  font-size: 0.82rem;
  font-weight: 780;
}

.site-footer {
  margin-top: clamp(3rem, 7vw, 6rem);
  padding-block: 3.5rem 2rem;
  border-top: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 82%, var(--bg));
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, minmax(0, 0.65fr));
  gap: 2.5rem;
}

.footer-brand p {
  max-width: 380px;
  margin-top: 0.9rem;
  color: var(--muted);
  font-size: 0.87rem;
}

.footer-column h2 {
  font-size: 0.79rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.footer-column a {
  display: block;
  margin-top: 0.62rem;
  color: var(--muted-strong);
  font-size: 0.84rem;
  font-weight: 600;
  text-decoration: none;
}

.footer-column a:hover {
  color: var(--brand-strong);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.76rem;
}

.noscript {
  margin: 1rem auto;
  padding: 1rem;
  border: 1px solid var(--danger);
  border-radius: 0.75rem;
  background: var(--danger-soft);
  color: var(--danger);
  text-align: center;
  font-weight: 700;
}

.not-found {
  display: grid;
  min-height: 62vh;
  place-items: center;
  text-align: center;
}

.not-found-code {
  color: var(--brand);
  font-size: clamp(5rem, 18vw, 11rem);
  font-weight: 900;
  letter-spacing: -0.08em;
  line-height: 0.8;
}

.not-found h1 {
  margin-top: 1.25rem;
  font-size: clamp(2rem, 5vw, 3.5rem);
}

.not-found p {
  max-width: 580px;
  margin: 1rem auto 0;
  color: var(--muted-strong);
}

.not-found .button {
  margin-top: 1.5rem;
}

@media (max-width: 1060px) {
  .site-nav a {
    padding-inline: 0.52rem;
    font-size: 0.8rem;
  }

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

  .footer-grid {
    grid-template-columns: 1.2fr repeat(3, minmax(0, 0.8fr));
    gap: 1.5rem;
  }
}

@media (max-width: 900px) {
  :root {
    --header-height: 4.2rem;
  }

  .nav-toggle {
    display: inline-block;
  }

  .site-nav {
    position: absolute;
    top: calc(100% + 0.5rem);
    right: 1rem;
    left: 1rem;
    display: none;
    align-items: stretch;
    flex-direction: column;
    padding: 0.65rem;
    border: 1px solid var(--border);
    border-radius: 1rem;
    background: var(--surface-raised);
    box-shadow: var(--shadow-lg);
  }

  .site-nav[data-open="true"] {
    display: flex;
  }

  .site-nav a {
    padding: 0.82rem 0.9rem;
    font-size: 0.9rem;
  }

  .hero-grid,
  .page-hero-grid,
  .calculator-shell {
    grid-template-columns: 1fr;
  }

  .hero-card {
    max-width: 640px;
  }

  .result-card {
    position: relative;
    top: auto;
  }

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

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

  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 640px) {
  .container,
  .narrow {
    width: min(100% - 1.1rem, var(--container));
  }

  .brand span {
    max-width: 10.5rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .hero {
    padding-top: 3.5rem;
  }

  .hero-actions,
  .form-actions,
  .result-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .hero-actions .button,
  .form-actions .button,
  .result-actions .button {
    width: 100%;
  }

  .field-grid,
  .field-grid-3,
  .result-grid,
  .segmented-control,
  .tool-grid,
  .affiliate-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .section-heading,
  .footer-bottom {
    align-items: flex-start;
    flex-direction: column;
  }

  .form-card,
  .result-card {
    padding: 1rem;
    border-radius: 1rem;
  }

  .result-hero {
    grid-template-columns: 1fr;
  }

  .result-secondary {
    text-align: left;
  }

  .footer-brand {
    grid-column: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}

@media print {
  :root {
    color-scheme: light;
    --bg: #fff;
    --surface: #fff;
    --surface-raised: #fff;
    --surface-muted: #f5f5f5;
    --text: #111;
    --text-strong: #000;
    --muted: #444;
    --muted-strong: #333;
    --border: #bbb;
  }

  body {
    background: #fff;
    font-size: 10pt;
  }

  .site-header,
  .site-footer,
  .hero,
  .page-hero,
  .section-heading,
  .form-card,
  .tool-grid,
  .feature-grid,
  .faq-list,
  .result-actions,
  .sponsor-strip,
  [data-print-hide] {
    display: none !important;
  }

  .section,
  .section-tight {
    padding: 0;
  }

  .container {
    width: 100%;
  }

  .calculator-shell {
    display: block;
  }

  .result-card {
    position: static;
    border: 0;
    box-shadow: none;
  }

  .result-card::before {
    display: none;
  }

  .result-disclaimer {
    display: block !important;
    margin-top: 14pt;
    padding: 9pt 10pt;
    border: 1px solid #777;
    border-left: 4px solid #333;
    background: #f5f5f5 !important;
    color: #111 !important;
    font-size: 8.5pt;
    line-height: 1.4;
    break-inside: avoid;
  }


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

/* Tutorial / editorial additions */
.article { font-size: 1.04rem; line-height: 1.75; }
.article h2 { margin-top: 0; font-size: clamp(1.7rem, 3vw, 2.35rem); }
.article h3 { margin-top: 2rem; margin-bottom: .55rem; font-size: 1.22rem; color: var(--text-strong); }
.article p { margin: 0 0 1.15rem; color: var(--muted-strong); }
.example-box { margin: 2rem 0; padding: 1.35rem 1.45rem; border: 1px solid var(--border); border-radius: 1rem; background: var(--surface-muted); }
.example-box h3 { margin-top: .15rem; }
.example-box p:last-child { margin-bottom: 0; }
@media print { .article, .example-box { display: none !important; } }