:root {
  --ink: #11151c;
  --muted: #6d7480;
  --paper: #f4f1e8;
  --surface: #fffdf7;
  --line: rgba(17, 21, 28, 0.12);
  --acid: #c6ff3d;
  --blue: #2563eb;
  --orange: #ff7a1a;
  --deep: #18202d;
  --shadow: 0 22px 55px rgba(17, 21, 28, 0.14);
  --radius: 18px;
  --max: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  color-scheme: light;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 10%, rgba(198, 255, 61, 0.34), transparent 27%),
    radial-gradient(circle at 92% 16%, rgba(37, 99, 235, 0.19), transparent 32%),
    linear-gradient(135deg, #f9f6ea 0%, #eef1f4 46%, #f6eadb 100%);
  font-family: "Aptos", "Segoe UI", sans-serif;
  line-height: 1.5;
}

body::before {
  content: "";
  inset: 0;
  pointer-events: none;
  position: fixed;
  background-image:
    linear-gradient(rgba(17, 21, 28, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(17, 21, 28, 0.035) 1px, transparent 1px);
  background-size: 34px 34px;
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.75), transparent 72%);
}

a {
  color: var(--deep);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

button,
input,
select {
  font: inherit;
}

button {
  cursor: pointer;
}

.site-header {
  border-bottom: 1px solid rgba(17, 21, 28, 0.09);
  background: rgba(244, 241, 232, 0.82);
  backdrop-filter: blur(18px);
  position: sticky;
  top: 0;
  z-index: 20;
}

.nav {
  align-items: center;
  display: flex;
  gap: 22px;
  justify-content: space-between;
  margin: 0 auto;
  max-width: var(--max);
  padding: 16px 22px;
}

.brand {
  align-items: center;
  display: inline-flex;
  gap: 10px;
  color: var(--ink);
  font-weight: 900;
  letter-spacing: -0.03em;
  text-decoration: none;
}

.brand-mark {
  align-items: center;
  background: var(--acid);
  border: 2px solid var(--ink);
  border-radius: 11px;
  box-shadow: 4px 4px 0 var(--ink);
  color: var(--ink);
  display: inline-flex;
  height: 34px;
  justify-content: center;
  width: 34px;
}

.nav-links {
  align-items: center;
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.nav-links a {
  color: var(--muted);
  font-size: 0.95rem;
  text-decoration: none;
}

.nav-links a:hover {
  color: var(--ink);
}

.page-shell {
  margin: 0 auto;
  max-width: var(--max);
  padding: 30px 22px 58px;
  position: relative;
}

.tool-intro {
  display: grid;
  gap: 20px;
  grid-template-columns: minmax(0, 0.95fr) minmax(260px, 0.42fr);
  margin: 24px 0 24px;
}

.eyebrow {
  color: var(--orange);
  font-size: 0.88rem;
  font-weight: 900;
  letter-spacing: 0.13em;
  margin: 0 0 12px;
  text-transform: uppercase;
}

.intro-copy h1 {
  font-size: clamp(2.25rem, 5vw, 5.2rem);
  letter-spacing: -0.075em;
  line-height: 0.92;
  margin: 0 0 18px;
  max-width: 840px;
}

.intro-copy p:not(.eyebrow) {
  color: var(--muted);
  font-size: 1.08rem;
  margin: 0;
  max-width: 760px;
}

.privacy-note {
  align-self: end;
  background: var(--deep);
  border: 1px solid rgba(17, 21, 28, 0.12);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  color: rgba(255, 255, 255, 0.78);
  padding: 18px;
}

.privacy-note strong {
  color: var(--acid);
  display: block;
  margin-bottom: 6px;
}

.tool-grid {
  align-items: stretch;
  display: grid;
  gap: 18px;
  grid-template-columns: minmax(310px, 430px) minmax(0, 1fr);
}

.panel {
  background: rgba(255, 253, 247, 0.9);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.controls {
  padding: 18px;
}

.control-stack {
  display: grid;
  gap: 16px;
}

.control {
  display: grid;
  gap: 8px;
}

.control label {
  color: var(--ink);
  font-size: 0.9rem;
  font-weight: 900;
}

select,
input[type="number"] {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  color: var(--ink);
  min-height: 46px;
  padding: 10px 12px;
  width: 100%;
}

input:disabled {
  background: rgba(17, 21, 28, 0.05);
  color: var(--muted);
}

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

.toggle-row {
  align-items: center;
  display: flex;
  gap: 10px;
}

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

.actions {
  display: grid;
  gap: 10px;
  grid-template-columns: 1fr 1fr;
}

.btn {
  align-items: center;
  border: 1px solid transparent;
  border-radius: 13px;
  display: inline-flex;
  font-weight: 900;
  justify-content: center;
  min-height: 46px;
  padding: 10px 14px;
  text-decoration: none;
  transition: transform 140ms ease, box-shadow 140ms ease, background 140ms ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--acid);
  border-color: var(--ink);
  box-shadow: 5px 5px 0 var(--ink);
  color: var(--ink);
}

.btn-secondary {
  background: var(--deep);
  color: #fff;
}

.results-panel {
  display: grid;
  gap: 16px;
  padding: 18px;
}

.result-hero {
  background:
    linear-gradient(135deg, rgba(198, 255, 61, 0.92), rgba(255, 122, 26, 0.22)),
    var(--acid);
  border: 2px solid var(--ink);
  border-radius: 16px;
  box-shadow: 7px 7px 0 var(--ink);
  display: grid;
  gap: 6px;
  padding: 22px;
}

.result-label,
.metric-card span {
  color: rgba(17, 21, 28, 0.68);
  font-size: 0.82rem;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.result-hero strong {
  font-size: clamp(3rem, 8vw, 6.4rem);
  letter-spacing: -0.08em;
  line-height: 0.9;
}

.metric-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.metric-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 15px;
  display: grid;
  gap: 5px;
  padding: 14px;
}

.metric-card strong {
  font-size: clamp(1.3rem, 2.6vw, 2rem);
  letter-spacing: -0.04em;
}

.detail-box {
  background: var(--deep);
  border-radius: 16px;
  color: rgba(255, 255, 255, 0.78);
  padding: 18px;
}

.detail-box h2 {
  color: #fff;
  font-size: 1.05rem;
  margin: 0 0 8px;
}

.detail-box p {
  margin: 0;
}

.quick-pairs {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.quick-pairs button {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--deep);
  font-size: 0.92rem;
  font-weight: 800;
  padding: 9px 12px;
}

.quick-pairs button:hover {
  border-color: var(--blue);
}

.seo-section {
  margin-top: 54px;
}

.seo-section h2 {
  font-size: clamp(1.75rem, 3vw, 2.65rem);
  letter-spacing: -0.045em;
  line-height: 1.04;
  margin: 0 0 14px;
}

.seo-section p {
  color: var(--muted);
  max-width: 860px;
}

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

.feature,
.faq-item {
  background: rgba(255, 253, 247, 0.78);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px;
}

.feature h3,
.faq-item h3 {
  font-size: 1.03rem;
  margin: 0 0 8px;
}

.feature p,
.faq-item p {
  font-size: 0.96rem;
  margin: 0;
}

.tag-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.tag-grid span {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--deep);
  font-weight: 800;
  padding: 9px 12px;
}

.content-page {
  background: rgba(255, 253, 247, 0.86);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  margin-top: 28px;
  padding: 28px;
}

.content-page h1 {
  font-size: clamp(2rem, 4vw, 3.2rem);
  letter-spacing: -0.055em;
  margin: 0 0 18px;
}

.content-page h2 {
  margin-top: 28px;
}

.content-page p,
.content-page li {
  color: var(--muted);
}

.site-footer {
  border-top: 1px solid rgba(17, 21, 28, 0.1);
  color: var(--muted);
  margin-top: 48px;
  padding: 22px;
}

.footer-inner {
  align-items: center;
  display: flex;
  gap: 16px;
  justify-content: space-between;
  margin: 0 auto;
  max-width: var(--max);
}

.footer-links {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

@media (max-width: 960px) {
  .tool-intro,
  .tool-grid {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 620px) {
  .nav,
  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
  }

  .split,
  .actions,
  .metric-grid,
  .feature-grid,
  .faq-grid {
    grid-template-columns: 1fr;
  }

  .page-shell {
    padding-inline: 14px;
  }

  .controls,
  .results-panel,
  .content-page {
    padding: 14px;
  }

  .result-hero {
    box-shadow: 4px 4px 0 var(--ink);
  }
}