:root {
  --radius: 16px;
  --font: "DM Sans", system-ui, -apple-system, sans-serif;
  --accent: #14b8a6;
  --accent-hover: #2dd4bf;
}

/* Default: dark */
:root,
[data-theme="dark"] {
  --bg: #0f1413;
  --surface: #1a2220;
  --ink: #e8efed;
  --muted: #9aaba7;
  --line: #2a3532;
  --accent-soft: rgba(20, 184, 166, 0.18);
  --danger: #f87171;
  --danger-bg: rgba(248, 113, 113, 0.12);
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
  --header-bg: rgba(15, 20, 19, 0.9);
  --input-bg: #121917;
  --seg-bg: #121917;
  --advanced-bg: #151c1a;
  --ad-fg: #6b7c78;
  --ad-a: #151c1a;
  --ad-b: #1a2220;
  --take-home-ink: #99f6e4;
}

[data-theme="light"] {
  --bg: #f4f7f6;
  --surface: #ffffff;
  --ink: #14201e;
  --muted: #5b6b68;
  --line: #d9e3e0;
  --accent: #0f766e;
  --accent-hover: #0d9488;
  --accent-soft: #ccfbf1;
  --danger: #b91c1c;
  --danger-bg: #fef2f2;
  --shadow: 0 10px 30px rgba(20, 32, 30, 0.06);
  --header-bg: rgba(244, 247, 246, 0.9);
  --input-bg: #fbfcfb;
  --seg-bg: #eef3f1;
  --advanced-bg: #fafcfb;
  --ad-fg: #9aa8a4;
  --ad-a: #f7faf9;
  --ad-b: #eef3f1;
  --take-home-ink: #115e59;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.5;
  padding-bottom: 72px;
}

.wrap {
  width: min(720px, calc(100% - 32px));
  margin-inline: auto;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.is-hidden {
  display: none !important;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--header-bg);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px 0;
}

.logo {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--ink);
  text-decoration: none;
}

.tagline {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.hero {
  padding: 28px 0 12px;
}

.hero h1 {
  margin: 0 0 8px;
  font-size: clamp(1.7rem, 4vw, 2.2rem);
  letter-spacing: -0.02em;
  line-height: 1.15;
}

.lede {
  margin: 0;
  color: var(--muted);
  font-size: 1.05rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 22px;
  margin: 16px 0;
}

.field {
  display: block;
  margin-bottom: 16px;
}

.label {
  display: block;
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 8px;
}

.money-input {
  display: flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0 14px;
  background: var(--input-bg);
  transition: border-color 0.15s, box-shadow 0.15s;
}

.money-input:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.currency {
  color: var(--muted);
  font-weight: 600;
}

input[type="number"],
input[type="text"] {
  width: 100%;
  border: 0;
  outline: 0;
  background: transparent;
  font: inherit;
  font-size: 1.05rem;
  padding: 14px 0;
  color: var(--ink);
}

input[type="number"] {
  -moz-appearance: textfield;
}

input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.mode {
  border: 0;
  margin: 0 0 18px;
  padding: 0;
}

.mode legend {
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 8px;
  padding: 0;
}

.segmented {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  background: var(--seg-bg);
  padding: 6px;
  border-radius: 12px;
}

.seg {
  border: 0;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-weight: 600;
  padding: 12px 10px;
  border-radius: 9px;
  cursor: pointer;
}

.seg.active {
  background: var(--surface);
  color: var(--ink);
  box-shadow: 0 1px 3px rgba(20, 32, 30, 0.08);
}

.recipients-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.recipients-head .label {
  margin: 0;
}

.btn-text {
  border: 0;
  background: transparent;
  color: var(--accent);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  padding: 4px 0;
}

.btn-text:hover {
  color: var(--accent-hover);
}

.recipient-list {
  display: grid;
  gap: 10px;
  margin-bottom: 16px;
}

.recipient-row {
  display: grid;
  grid-template-columns: 1.4fr 1fr auto;
  gap: 8px;
  align-items: center;
}

.recipient-row .money-input,
.recipient-row .text-input {
  margin: 0;
}

.text-input {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0 12px;
  background: var(--input-bg);
}

.text-input:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.btn-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--muted);
  font-size: 1.2rem;
  cursor: pointer;
}

.btn-icon:hover {
  color: var(--danger);
  border-color: #fecaca;
  background: var(--danger-bg);
}

.check {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 8px 0 16px;
  font-weight: 500;
  cursor: pointer;
}

.check input {
  width: 18px;
  height: 18px;
  accent-color: var(--accent);
}

.advanced {
  margin: 0 0 18px;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0 14px;
  background: var(--advanced-bg);
}

.advanced summary {
  cursor: pointer;
  font-weight: 600;
  padding: 14px 0;
  list-style: none;
}

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

.advanced summary::after {
  content: "+";
  float: right;
  color: var(--muted);
}

.advanced[open] summary::after {
  content: "–";
}

.advanced-body {
  padding-bottom: 14px;
}

.hint {
  display: block;
  color: var(--muted);
  font-size: 0.88rem;
  margin-top: 6px;
}

.split-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.btn-primary {
  width: 100%;
  border: 0;
  border-radius: 14px;
  background: var(--accent);
  color: white;
  font: inherit;
  font-weight: 700;
  font-size: 1.05rem;
  padding: 16px 18px;
  cursor: pointer;
  box-shadow: 0 8px 20px rgba(15, 118, 110, 0.25);
}

.btn-primary:hover {
  background: var(--accent-hover);
}

.error {
  margin-top: 14px;
  padding: 12px 14px;
  border-radius: 12px;
  background: var(--danger-bg);
  color: var(--danger);
  font-weight: 600;
}

.results {
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.results h3 {
  margin: 0 0 12px;
  font-size: 1.05rem;
}

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

table {
  width: 100%;
  border-collapse: collapse;
}

th,
td {
  text-align: left;
  padding: 12px 8px;
  border-bottom: 1px solid var(--line);
}

th {
  color: var(--muted);
  font-weight: 600;
  font-size: 0.88rem;
}

td:last-child,
th:last-child {
  text-align: right;
}

.totals {
  margin-top: 8px;
}

.total-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 0;
  font-size: 1.02rem;
}

.total-row.take-home {
  margin-top: 4px;
  padding: 14px;
  border-radius: 12px;
  background: var(--accent-soft);
  color: var(--take-home-ink);
}

.about h2,
.related h2 {
  margin: 0 0 12px;
  font-size: 1.15rem;
}

.about ul,
.related ul {
  margin: 0 0 14px;
  padding-left: 1.2rem;
  color: var(--ink);
}

.about p {
  color: var(--muted);
  margin: 0 0 10px;
}

.related ul {
  list-style: none;
  padding: 0;
  display: grid;
  gap: 8px;
}

.related a {
  display: block;
  padding: 12px 14px;
  border-radius: 12px;
  background: var(--surface);
  border: 1px solid var(--line);
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
}

.related a:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.site-footer {
  border-top: 1px solid var(--line);
  margin-top: 24px;
  padding: 20px 0 28px;
  color: var(--muted);
  font-size: 0.92rem;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.footer-inner p {
  margin: 0;
}

.site-footer nav {
  display: flex;
  align-items: center;
  gap: 16px;
}


.site-footer a {
  color: var(--muted);
  text-decoration: none;
}

.site-footer a:hover {
  color: var(--accent);
}

.ad-slot {
  display: none; /* hidden until AdSense is approved */
  align-items: center;
  justify-content: center;
  min-height: 0;
  margin: 0;
  width: min(720px, calc(100% - 32px));
}

.ad-slot.is-live {
  display: flex;
  min-height: 56px;
  margin: 12px auto;
  border: 0;
  border-radius: 12px;
  background: transparent;
  color: transparent;
  font-size: 0;
}

.faq details {
  border-top: 1px solid var(--line);
  padding: 12px 0;
}

.faq details:first-of-type {
  border-top: 0;
  padding-top: 0;
}

.faq summary {
  cursor: pointer;
  font-weight: 600;
  list-style: none;
}

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

.faq summary::after {
  content: "+";
  float: right;
  color: var(--muted);
  font-weight: 500;
}

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

.faq details p {
  margin: 8px 0 0;
  color: var(--muted);
}

.ad-sticky {
  position: fixed;
  left: 12px;
  right: 12px;
  bottom: 12px;
  width: auto;
  z-index: 15;
  min-height: 50px;
  box-shadow: var(--shadow);
}

@media (min-width: 720px) {
  .ad-sticky {
    display: none;
  }

  body {
    padding-bottom: 0;
  }

  .recipient-row {
    grid-template-columns: 1.6fr 1fr auto;
  }
}

@media (max-width: 520px) {
  .split-row {
    grid-template-columns: 1fr;
  }

  .recipient-row {
    grid-template-columns: 1fr 1fr;
  }

  .recipient-row .btn-icon {
    grid-column: 2;
    justify-self: end;
  }
}

.theme-toggle {
  margin-left: auto;
  width: 42px;
  height: 42px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  font-size: 1.15rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

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

.color-scheme-fix {
  color-scheme: dark;
}

[data-theme="light"] .color-scheme-fix {
  color-scheme: light;
}

.legal h2 {
  margin: 1.4rem 0 0.5rem;
  font-size: 1.05rem;
}
.legal a {
  color: var(--accent);
}