:root {
  --ink: #1c2330;
  --muted: #617084;
  --paper: #f5efe7;
  --surface: #fffaf3;
  --line: #d8cfc2;
  --leaf: #0f766e;
  --leaf-dark: #115e59;
  --coral: #c25b39;
  --sun: #dfac31;
  --sky: #dceef7;
  --shadow: 0 20px 48px rgba(28, 35, 48, 0.14);
  --radius: 10px;
  --max: 1180px;
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    linear-gradient(135deg, rgba(220, 238, 247, 0.92), rgba(245, 239, 231, 0.96) 38%, rgba(223, 172, 49, 0.18)),
    radial-gradient(circle at 15% 8%, rgba(15, 118, 110, 0.12), transparent 26%),
    radial-gradient(circle at 82% 12%, rgba(194, 91, 57, 0.12), transparent 24%),
    var(--paper);
  font-family: "Aptos", "Segoe UI", sans-serif;
  line-height: 1.5;
}

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

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

button {
  cursor: pointer;
}

.site-header {
  border-bottom: 1px solid rgba(28, 35, 48, 0.09);
  background: rgba(245, 239, 231, 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;
  color: var(--ink);
  display: inline-flex;
  font-weight: 900;
  gap: 10px;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.brand-mark {
  align-items: center;
  background: linear-gradient(135deg, var(--leaf), #19a7a0);
  border: 2px solid var(--ink);
  border-radius: 8px;
  color: #fffdf7;
  display: inline-flex;
  height: 34px;
  justify-content: center;
  width: 34px;
}

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

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

.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;
}

.tool-intro {
  display: grid;
  gap: 18px;
  grid-template-columns: minmax(0, 0.92fr) minmax(260px, 0.48fr);
  margin: 24px 0 22px;
}

.intro-copy h1 {
  font-size: clamp(2.15rem, 4.3vw, 4.45rem);
  line-height: 0.98;
  margin: 0 0 18px;
  max-width: 850px;
}

.intro-copy p {
  color: var(--muted);
  font-size: 1.08rem;
  margin: 0;
  max-width: 720px;
}

.privacy-note {
  align-self: end;
  background: rgba(255, 250, 243, 0.72);
  border-left: 4px solid var(--sun);
  border-radius: 0 12px 12px 0;
  color: var(--muted);
  padding: 14px 16px;
}

.privacy-note strong {
  color: var(--ink);
  display: block;
  margin-bottom: 4px;
}

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

.intent-strip article {
  background: rgba(255, 250, 243, 0.7);
  border: 1px solid rgba(28, 35, 48, 0.1);
  border-radius: var(--radius);
  padding: 16px;
}

.intent-strip strong {
  display: block;
  margin-bottom: 6px;
}

.intent-strip span {
  color: var(--muted);
  font-size: 0.95rem;
}

.tool-grid {
  align-items: start;
  display: grid;
  gap: 18px;
  grid-template-columns: minmax(320px, 430px) minmax(0, 1fr);
}

.panel {
  background: rgba(255, 250, 243, 0.86);
  border: 1px solid rgba(28, 35, 48, 0.12);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.controls {
  padding: 18px;
}

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

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

.control-row {
  align-items: center;
  display: flex;
  gap: 12px;
  justify-content: space-between;
}

.control label,
.control legend {
  color: var(--ink);
  font-size: 0.92rem;
  font-weight: 800;
}

.control output {
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.hint {
  color: var(--muted);
  font-size: 0.86rem;
}

input[type="range"] {
  accent-color: var(--leaf);
  width: 100%;
}

input[type="number"],
input[type="text"],
select,
textarea {
  background: #fffdf8;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink);
  min-height: 42px;
  padding: 9px 10px;
  width: 100%;
}

textarea {
  min-height: 112px;
  resize: vertical;
}

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

.actions {
  display: grid;
  gap: 10px;
  grid-template-columns: 1fr 1fr;
  margin-top: 18px;
}

.btn {
  align-items: center;
  border: 1px solid transparent;
  border-radius: 8px;
  display: inline-flex;
  font-weight: 900;
  justify-content: center;
  min-height: 44px;
  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(--leaf);
  box-shadow: 0 12px 22px rgba(15, 118, 110, 0.24);
  color: #fff;
}

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

.btn-secondary {
  background: #fffdf8;
  border-color: var(--line);
  color: var(--ink);
}

.preview-panel {
  min-height: 620px;
  overflow: hidden;
}

.preview-topbar {
  align-items: center;
  border-bottom: 1px solid rgba(28, 35, 48, 0.1);
  display: flex;
  gap: 12px;
  justify-content: space-between;
  padding: 14px 16px;
}

.file-meta {
  color: var(--muted);
  font-size: 0.92rem;
}

.result-body {
  display: grid;
  gap: 16px;
  padding: 18px;
}

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

.metric-card {
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid rgba(28, 35, 48, 0.1);
  border-radius: var(--radius);
  padding: 14px 16px;
}

.metric-card strong {
  display: block;
  font-size: clamp(1.2rem, 2.2vw, 1.7rem);
  line-height: 1.08;
  margin-bottom: 6px;
}

.metric-card span {
  color: var(--muted);
  font-size: 0.92rem;
}

.summary-box {
  background: linear-gradient(135deg, #1c2330, #273448);
  border-radius: var(--radius);
  color: rgba(255, 255, 255, 0.84);
  padding: 18px;
}

.summary-box strong {
  color: #fff;
  display: block;
  font-size: 1.05rem;
  margin-bottom: 8px;
}

.summary-box p {
  margin: 0;
}

.breakdown {
  display: grid;
  gap: 12px;
}

.breakdown-bar {
  background: rgba(28, 35, 48, 0.08);
  border-radius: 999px;
  display: flex;
  min-height: 18px;
  overflow: hidden;
}

.breakdown-segment {
  min-width: 4px;
}

.segment-personal {
  background: linear-gradient(90deg, #0f766e, #20b2aa);
}

.segment-business {
  background: linear-gradient(90deg, #c25b39, #e47d4d);
}

.segment-tax {
  background: linear-gradient(90deg, #dfac31, #f2c75b);
}

.segment-savings {
  background: linear-gradient(90deg, #284b63, #547997);
}

.breakdown-legend {
  display: grid;
  gap: 8px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.legend-item {
  align-items: center;
  background: rgba(255, 255, 255, 0.66);
  border: 1px solid rgba(28, 35, 48, 0.08);
  border-radius: 999px;
  display: flex;
  gap: 10px;
  justify-content: space-between;
  padding: 8px 12px;
}

.legend-label {
  align-items: center;
  display: inline-flex;
  gap: 8px;
}

.legend-swatch {
  border-radius: 999px;
  display: inline-block;
  height: 12px;
  width: 12px;
}

.swatch-personal {
  background: #0f766e;
}

.swatch-business {
  background: #c25b39;
}

.swatch-tax {
  background: #dfac31;
}

.swatch-savings {
  background: #284b63;
}

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

.detail-card {
  background: rgba(255, 255, 255, 0.64);
  border: 1px solid rgba(28, 35, 48, 0.1);
  border-radius: var(--radius);
  padding: 16px;
}

.detail-card strong {
  display: block;
  font-size: 1rem;
  margin-bottom: 6px;
}

.detail-card p {
  color: var(--muted);
  margin: 0;
}

.report-box {
  background: #fffdf8;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--ink);
  font-family: "Cascadia Mono", "Consolas", monospace;
  font-size: 0.9rem;
  min-height: 128px;
  padding: 12px;
  white-space: pre-wrap;
}

.seo-section {
  margin-top: 52px;
}

.seo-section h2 {
  font-size: clamp(1.7rem, 3vw, 2.45rem);
  line-height: 1.08;
  margin: 0 0 14px;
}

.seo-section p {
  color: var(--muted);
  max-width: 820px;
}

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

.feature,
.faq-item,
.scenario-card {
  background: rgba(255, 255, 255, 0.66);
  border: 1px solid rgba(28, 35, 48, 0.1);
  border-radius: var(--radius);
  padding: 16px;
}

.feature h3,
.faq-item h3,
.scenario-card h3 {
  font-size: 1.02rem;
  margin: 0 0 8px;
}

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

.scenario-card {
  display: grid;
  gap: 12px;
}

.content-page {
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(28, 35, 48, 0.1);
  border-radius: var(--radius);
  margin-top: 28px;
  padding: 28px;
}

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

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

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

.content-page ul,
.content-page ol {
  padding-left: 22px;
}

.callout {
  background: rgba(15, 118, 110, 0.08);
  border-left: 4px solid var(--leaf);
  border-radius: var(--radius);
  color: var(--muted);
  margin-top: 16px;
  padding: 14px 16px;
}

.guide-callout {
  background: rgba(15, 118, 110, 0.08);
  border: 1px solid rgba(15, 118, 110, 0.18);
  border-radius: var(--radius);
  color: var(--muted);
  margin-top: 18px;
  padding: 16px;
}

.site-footer {
  border-top: 1px solid rgba(28, 35, 48, 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;
  flex-wrap: wrap;
  gap: 14px;
}

@media (max-width: 900px) {
  .tool-intro,
  .tool-grid,
  .intent-strip,
  .feature-grid,
  .faq-grid,
  .scenario-grid {
    grid-template-columns: 1fr;
  }

  .preview-panel {
    min-height: auto;
  }

  .metric-strip,
  .detail-grid,
  .breakdown-legend {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .nav,
  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
  }

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

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

  .controls,
  .content-page,
  .result-body {
    padding: 14px;
  }
}