:root {
  --blue: #0066cc;
  --blue-focus: #0071e3;
  --blue-dark: #2997ff;
  --ink: #1d1d1f;
  --ink-soft: #6e6e73;
  --white: #ffffff;
  --parchment: #f5f5f7;
  --pearl: #fafafc;
  --tile: #272729;
  --tile-two: #2a2a2c;
  --black: #000000;
  --hairline: #d2d2d7;
  --hairline-dark: rgba(255, 255, 255, 0.16);
  --display: "SF Pro Display", system-ui, -apple-system, BlinkMacSystemFont, "PingFang TC", "Noto Sans TC", sans-serif;
  --text: "SF Pro Text", system-ui, -apple-system, BlinkMacSystemFont, "PingFang TC", "Noto Sans TC", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 112px; }
body {
  margin: 0;
  overflow-x: hidden;
  color: var(--ink);
  background: var(--white);
  font-family: var(--text);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.47;
  letter-spacing: -0.022em;
  text-rendering: optimizeLegibility;
}
a { color: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
button { font: inherit; }

.skip-link {
  position: fixed;
  z-index: 1000;
  top: 8px;
  left: 12px;
  transform: translateY(-160%);
  padding: 10px 16px;
  color: var(--white);
  background: var(--blue);
  border-radius: 9999px;
  font-size: 14px;
}
.skip-link:focus { transform: translateY(0); }
.page-shell { width: 100%; }

.site-header { position: sticky; z-index: 50; top: 0; }
.global-nav { height: 44px; color: var(--white); background: var(--black); }
.nav-inner, .sub-nav-inner {
  width: min(980px, calc(100% - 40px));
  height: 100%;
  margin-inline: auto;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 24px;
}
.nav-title {
  width: fit-content;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  font-size: 12px;
  font-weight: 400;
  letter-spacing: -0.01em;
}
.nav-mark {
  width: 24px;
  height: 24px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, 0.55);
  border-radius: 50%;
  font-size: 11px;
  font-weight: 600;
}
.nav-inner nav { display: flex; align-items: center; justify-content: center; gap: 28px; }
.nav-inner nav a {
  color: rgba(255, 255, 255, 0.78);
  text-decoration: none;
  font-size: 12px;
  font-weight: 400;
  letter-spacing: -0.01em;
}
.nav-inner nav a:active { transform: scale(0.95); }
.draft-state { justify-self: end; color: rgba(255, 255, 255, 0.74); font-size: 12px; }

.sub-nav {
  height: 52px;
  color: var(--ink);
  background: rgba(245, 245, 247, 0.88);
  border-bottom: 1px solid rgba(0, 0, 0, 0.08);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
}
.sub-nav-inner { grid-template-columns: 1fr auto auto; gap: 20px; }
.sub-nav strong {
  font-family: var(--display);
  font-size: 21px;
  font-weight: 600;
  letter-spacing: 0.011em;
}
.sub-nav span { color: var(--ink-soft); font-size: 14px; }
.sub-nav a {
  padding: 8px 16px;
  color: var(--white);
  background: var(--blue);
  border-radius: 9999px;
  text-decoration: none;
  font-size: 14px;
  line-height: 1;
}
.sub-nav a:active { transform: scale(0.95); }
main { width: 100%; }

.hero {
  min-height: 820px;
  padding: 96px 24px 80px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: var(--white);
}
.hero-copy { width: min(980px, 100%); }
.context-line,
.chapter-heading > p,
.compound-copy > p:first-child,
.comparison-check > div > p,
.final-takeaway > p:first-child,
.source-block > div:first-child > p {
  margin: 0 0 14px;
  color: var(--ink-soft);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: -0.014em;
}
.hero h1 {
  margin: 0;
  color: var(--ink);
  font-family: var(--display);
  font-size: 56px;
  font-weight: 600;
  line-height: 1.07;
  letter-spacing: -0.015em;
  text-wrap: balance;
}
.hero-intro {
  width: min(820px, 100%);
  margin: 22px auto 0;
  color: var(--ink-soft);
  font-family: var(--display);
  font-size: 24px;
  font-weight: 300;
  line-height: 1.5;
  letter-spacing: 0;
}
.hero-actions { margin-top: 28px; display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; }
.hero-actions a {
  min-height: 44px;
  padding: 11px 22px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--blue);
  border-radius: 9999px;
  text-decoration: none;
  font-size: 17px;
  font-weight: 400;
  line-height: 1;
}
.hero-actions a:active { transform: scale(0.95); }
.primary-action { color: var(--white); background: var(--blue); }
.secondary-action { color: var(--blue); background: transparent; }

.rate-orbit {
  position: relative;
  width: min(620px, 92vw);
  aspect-ratio: 1.45;
  margin-top: 68px;
  isolation: isolate;
  filter: drop-shadow(3px 5px 30px rgba(0, 0, 0, 0.22));
}
.orbit-glow { display: none; }
.orbit-ring {
  position: absolute;
  left: 50%;
  border: 1px solid var(--hairline);
  border-radius: 50%;
  transform: translateX(-50%);
}
.orbit-ring-one { inset: 2% 16%; }
.orbit-ring-two { inset: 20% 29%; border-style: dashed; }
.orbit-center {
  position: absolute;
  inset: 34% 40%;
  display: grid;
  place-content: center;
  color: var(--ink);
  background: var(--white);
  border: 1px solid var(--hairline);
  border-radius: 50%;
}
.orbit-center span, .orbit-node small { color: var(--ink-soft); font-size: 12px; letter-spacing: -0.01em; }
.orbit-center strong, .orbit-node strong {
  display: block;
  margin-top: 2px;
  color: var(--ink);
  font-family: var(--display);
  font-size: 21px;
  font-weight: 600;
}
.orbit-node {
  position: absolute;
  z-index: 2;
  min-width: 178px;
  padding: 18px;
  text-align: left;
  background: var(--pearl);
  border: 1px solid var(--hairline);
  border-radius: 18px;
}
.orbit-node-fixed { top: 3%; right: 3%; }
.orbit-node-variable { bottom: 3%; left: 3%; }
.orbit-node::before {
  content: "";
  position: absolute;
  top: 0;
  right: 18px;
  left: 18px;
  height: 2px;
  background: var(--blue);
}

.thesis-strip {
  padding: 80px max(24px, calc((100% - 980px) / 2));
  display: grid;
  grid-template-columns: 1fr 1px 1fr;
  align-items: center;
  gap: 48px;
  color: var(--white);
  background: var(--black);
}
.thesis-strip p {
  margin: 0;
  text-align: center;
  font-family: var(--display);
  font-size: 28px;
  font-weight: 400;
  line-height: 1.14;
  letter-spacing: 0.007em;
  white-space: nowrap;
}
.thesis-strip span { width: 1px; height: 48px; background: rgba(255, 255, 255, 0.28); }

.chapter { padding: 120px 24px; }
.chapter-heading { width: min(980px, 100%); margin: 0 auto 64px; text-align: center; }
.chapter-heading h2,
.compound-copy h3,
.comparison-check h3,
.source-block h2 {
  margin: 0;
  font-family: var(--display);
  font-size: 40px;
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.01em;
  text-wrap: balance;
}
#paths { background: var(--parchment); }
.path-grid {
  width: min(1440px, 100%);
  margin: 0 auto -120px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
.path-card {
  min-height: 690px;
  padding: 80px max(32px, 6vw);
  display: flex;
  flex-direction: column;
  background: var(--white);
}
.path-card-growth { color: var(--white); background: var(--tile); }
.path-card-head { display: flex; align-items: center; justify-content: center; gap: 10px; }
.path-card-head p { margin: 0; color: var(--ink-soft); font-size: 14px; font-weight: 600; }
.path-card-growth .path-card-head p { color: #cccccc; }
.path-symbol {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  color: var(--blue);
  border: 1px solid var(--blue);
  border-radius: 50%;
  font-size: 14px;
}
.path-card-growth .path-symbol { color: var(--blue-dark); border-color: var(--blue-dark); }
.path-card h3 {
  margin: 28px auto 20px;
  max-width: 560px;
  text-align: center;
  font-family: var(--display);
  font-size: 40px;
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.01em;
}
.path-lead { max-width: 600px; margin: 0 auto; color: var(--ink-soft); text-align: center; }
.path-card-growth .path-lead, .path-card-growth .path-note { color: #cccccc; }
.path-card ul { width: 100%; margin: 48px 0 0; padding: 0; list-style: none; border-top: 1px solid var(--hairline); }
.path-card-growth ul { border-color: var(--hairline-dark); }
.path-card li {
  padding: 18px 0;
  display: grid;
  grid-template-columns: 100px minmax(0, 1fr);
  gap: 18px;
  border-bottom: 1px solid var(--hairline);
}
.path-card-growth li { border-color: var(--hairline-dark); }
.path-card li span { color: var(--ink-soft); font-size: 14px; }
.path-card-growth li span { color: #a1a1a6; }
.path-card li strong { font-weight: 600; }
.path-line { height: 2px; margin-top: auto; overflow: hidden; background: var(--hairline); }
.path-card-growth .path-line { background: var(--hairline-dark); }
.path-line span {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: left;
  background: var(--blue);
}
.path-card-growth .path-line span { background: var(--blue-dark); }
.path-note { margin: 16px 0 0; color: var(--ink-soft); font-size: 14px; }

.rate-layers { width: 100%; margin: 0; padding: 120px 24px; color: var(--white); background: var(--black); }
.chapter-heading-light > p { color: #a1a1a6; }
.layer-grid {
  width: min(1440px, 100%);
  margin-inline: auto;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid var(--hairline-dark);
  border-bottom: 1px solid var(--hairline-dark);
}
.layer-card {
  min-height: 360px;
  padding: 48px;
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--hairline-dark);
}
.layer-card:last-child { border-right: 0; }
.layer-kicker { margin: 0; color: var(--blue-dark); font-size: 14px; font-weight: 600; }
.layer-card h3 {
  margin: 20px 0 14px;
  font-family: var(--display);
  font-size: 40px;
  font-weight: 600;
  line-height: 1.1;
}
.layer-card > p:not(.layer-kicker) { margin: 0; color: #cccccc; }
.layer-status {
  margin-top: auto;
  padding-top: 24px;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 18px;
  border-top: 1px solid var(--hairline-dark);
}
.layer-status span { color: #a1a1a6; font-size: 14px; }
.layer-status strong { text-align: right; font-weight: 600; }

.compound-story {
  width: min(980px, 100%);
  margin: 120px auto 0;
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(420px, 1.1fr);
  align-items: center;
  gap: 80px;
}
.compound-copy > p:first-child { color: #a1a1a6; }
.compound-copy > p:last-child { margin: 24px 0 0; color: #cccccc; }
.compound-visual {
  position: relative;
  min-height: 360px;
  padding: 40px;
  display: grid;
  align-items: center;
  border: 1px solid var(--hairline-dark);
}
.compound-visual svg { width: 100%; height: auto; }
.guide-line { fill: none; stroke: rgba(255, 255, 255, 0.16); stroke-width: 7; }
.growth-curve {
  fill: none;
  stroke: var(--blue-dark);
  stroke-width: 7;
  stroke-linecap: round;
  stroke-dasharray: 900;
  stroke-dashoffset: 900;
}
.growth-pulse {
  fill: none;
  stroke: #a8d8ff;
  stroke-width: 11;
  stroke-linecap: round;
  stroke-dasharray: 2 792;
  stroke-dashoffset: 0;
  opacity: 0;
  filter: drop-shadow(0 0 8px rgba(41, 151, 255, 0.95));
}
.compound-visual.is-in-view .growth-pulse {
  opacity: 1;
  animation: growth-pulse 2.8s linear infinite;
}
.compound-visual circle { fill: var(--blue-dark); }
.visual-label { position: absolute; color: #cccccc; font-size: 12px; }
.visual-label-start { bottom: 64px; left: 40px; }
.visual-label-end { top: 44px; right: 40px; }
.compound-visual small {
  position: absolute;
  right: 24px;
  bottom: 16px;
  left: 24px;
  color: #86868b;
  font-size: 10px;
  text-align: center;
}

.decision-chapter { background: var(--white); }
.decision-layout, .comparison-check { width: min(1180px, 100%); margin-inline: auto; }
.decision-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.88fr) minmax(420px, 1.12fr);
  gap: 24px;
}
.decision-switcher { display: grid; gap: 16px; }
.decision-button {
  min-height: 180px;
  padding: 28px 32px;
  display: grid;
  gap: 6px;
  color: var(--ink);
  text-align: left;
  background: var(--white);
  border: 1px solid var(--hairline);
  border-radius: 18px;
  cursor: pointer;
}
.decision-button.is-active { border: 2px solid var(--blue-focus); }
.decision-button:active { transform: scale(0.98); }
.decision-button span { color: var(--ink-soft); font-size: 14px; }
.decision-button strong { font-family: var(--display); font-size: 34px; font-weight: 600; line-height: 1.2; }
.decision-button small { color: var(--ink-soft); font-size: 14px; }
.decision-result {
  min-height: 376px;
  padding: 56px;
  display: flex;
  flex-direction: column;
  color: var(--white);
  background: var(--tile);
}
.decision-result > p:first-child { margin: 0; color: var(--blue-dark); font-size: 14px; font-weight: 600; }
.decision-result h3 {
  margin: 20px 0 16px;
  font-family: var(--display);
  font-size: 40px;
  font-weight: 600;
  line-height: 1.1;
}
.decision-result > p:not(:first-child) { margin: 0; color: #cccccc; }
.result-metric { margin-top: auto; padding-top: 24px; border-top: 1px solid var(--hairline-dark); }
.result-metric span { display: block; color: #a1a1a6; font-size: 12px; }
.result-metric strong { display: block; margin-top: 8px; font-weight: 600; }

.comparison-check {
  margin-top: 120px;
  display: grid;
  grid-template-columns: minmax(300px, 0.85fr) minmax(0, 1.15fr);
  gap: 80px;
}
.comparison-check ol { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--hairline); }
.comparison-check li {
  padding: 20px 0;
  display: grid;
  grid-template-columns: 100px minmax(0, 1fr);
  gap: 20px;
  border-bottom: 1px solid var(--hairline);
}
.comparison-check li span { color: var(--blue); }
.comparison-check li p { margin: 0; color: var(--ink-soft); }

.final-takeaway {
  padding: 120px max(24px, calc((100% - 980px) / 2));
  color: var(--white);
  background: var(--tile-two);
  text-align: center;
}
.final-takeaway > p:first-child { color: #a1a1a6; }
.final-takeaway h2 {
  max-width: 980px;
  margin: 0 auto;
  font-family: var(--display);
  font-size: 40px;
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.01em;
  text-wrap: balance;
}
.final-takeaway > p:last-child { max-width: 760px; margin: 24px auto 0; color: #cccccc; }

.source-block {
  padding: 80px max(24px, calc((100% - 980px) / 2));
  display: grid;
  grid-template-columns: minmax(280px, 0.82fr) minmax(0, 1.18fr);
  gap: 72px;
  background: var(--parchment);
}
.source-copy > p { margin: 0; color: var(--ink-soft); }
.source-links { margin-top: 24px; border-top: 1px solid var(--hairline); }
.source-links a {
  min-height: 48px;
  padding: 14px 0;
  display: block;
  color: var(--blue);
  border-bottom: 1px solid var(--hairline);
  text-decoration: none;
}
.source-links a::after { content: "\2197"; float: right; }
footer {
  padding: 24px max(24px, calc((100% - 980px) / 2)) 48px;
  display: flex;
  justify-content: space-between;
  gap: 24px;
  color: var(--ink-soft);
  background: var(--parchment);
  border-top: 1px solid var(--hairline);
  font-size: 12px;
  letter-spacing: -0.01em;
}

:focus-visible { outline: 2px solid var(--blue-focus); outline-offset: 3px; }
.js .reveal-block { opacity: 0; transform: translateY(24px); }

@keyframes growth-pulse {
  to { stroke-dashoffset: -794; }
}

@media (max-width: 1068px) {
  .hero { min-height: 760px; }
  .hero h1,
  .chapter-heading h2,
  .compound-copy h3,
  .comparison-check h3,
  .source-block h2,
  .final-takeaway h2,
  .path-card h3,
  .layer-card h3,
  .decision-result h3 { font-size: 40px; }
  .path-card { padding: 64px 44px; }
  .compound-story, .comparison-check, .source-block { grid-template-columns: 1fr; }
  .compound-story { width: min(760px, 100%); }
}

@media (max-width: 833px) {
  html { scroll-padding-top: 100px; }
  .nav-inner { grid-template-columns: 1fr auto; }
  .nav-inner nav { display: none; }
  .sub-nav-inner { grid-template-columns: 1fr auto; }
  .sub-nav span { display: none; }
  .hero { padding-top: 72px; }
  .path-grid, .layer-grid, .decision-layout { grid-template-columns: 1fr; }
  .path-card { min-height: 620px; }
  .layer-card { min-height: 300px; border-right: 0; border-bottom: 1px solid var(--hairline-dark); }
  .layer-card:last-child { border-bottom: 0; }
  .compound-story { grid-template-columns: 1fr; }
  .decision-result { min-height: 390px; }
}

@media (max-width: 640px) {
  .nav-inner, .sub-nav-inner { width: calc(100% - 28px); }
  .draft-state { display: none; }
  .sub-nav strong { font-size: 17px; }
  .hero { min-height: auto; padding: 64px 20px 56px; }
  .hero h1 { font-size: 34px; line-height: 1.1; }
  .hero-intro { font-size: 21px; line-height: 1.4; }
  .hero-actions { display: grid; width: 100%; }
  .rate-orbit { margin-top: 48px; }
  .orbit-node { min-width: 138px; padding: 14px; }
  .orbit-center strong, .orbit-node strong { font-size: 17px; }
  .thesis-strip { padding: 64px 24px; grid-template-columns: 1fr; gap: 24px; }
  .thesis-strip p { font-size: 24px; }
  .thesis-strip span { width: 48px; height: 1px; margin-inline: auto; }
  .chapter, .rate-layers { padding: 80px 20px; }
  .chapter-heading { margin-bottom: 48px; }
  .chapter-heading h2,
  .compound-copy h3,
  .comparison-check h3,
  .source-block h2,
  .final-takeaway h2,
  .path-card h3,
  .layer-card h3,
  .decision-result h3 { font-size: 34px; }
  .path-grid { width: calc(100% + 40px); margin-right: -20px; margin-bottom: -80px; margin-left: -20px; }
  .path-card { min-height: 0; padding: 64px 24px; }
  .path-card li { grid-template-columns: 1fr; gap: 4px; }
  .path-line { margin-top: 40px; }
  .layer-card { padding: 40px 24px; }
  .compound-story, .comparison-check { margin-top: 80px; }
  .compound-visual { min-height: 300px; padding: 20px; }
  .visual-label-start { bottom: 52px; left: 20px; }
  .visual-label-end { top: 32px; right: 20px; }
  .decision-layout { gap: 16px; }
  .decision-button { min-height: 156px; padding: 24px; }
  .decision-button strong { font-size: 28px; }
  .decision-result { min-height: 360px; padding: 40px 24px; }
  .comparison-check li { grid-template-columns: 1fr; gap: 4px; }
  .final-takeaway, .source-block { padding: 80px 24px; }
  footer { flex-direction: column; gap: 6px; }
}

@media (max-width: 419px) {
  .hero h1 { font-size: 28px; }
  .hero-intro { font-size: 17px; }
  .orbit-center span, .orbit-node small { font-size: 10px; }
  .chapter-heading h2,
  .compound-copy h3,
  .comparison-check h3,
  .source-block h2,
  .final-takeaway h2,
  .path-card h3,
  .layer-card h3,
  .decision-result h3 { font-size: 28px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .js .reveal-block { opacity: 1; transform: none; }
  .growth-curve, .path-line span { stroke-dashoffset: 0; transform: none; }
  .compound-visual.is-in-view .growth-pulse { animation: none; opacity: 0; }
}