@import url("https://fonts.googleapis.com/css2?family=DM+Sans:opsz,wght@9..40,400..700&display=swap");

:root {
  --mint: #1ec677;
  --mint-deep: #12a862;
  --mint-bright: #00b96d;
  --mint-soft: #e4f7ee;
  --canvas: #f6fbf8;
  --surface: #ffffff;
  --ink: #0f1a14;
  --ink-on-mint: #062014;
  --muted: #5c6e63;
  --amber: #fff0bf;
  --amber-ink: #6b4d00;
  --coral: #ffe2dc;
  --coral-ink: #6f281e;
  --hairline: #dcebe3;
  --shadow: 0 18px 48px rgba(18, 168, 98, 0.18);
  --font: "DM Sans", -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--canvas);
  color: var(--ink);
  font-family: var(--font);
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  background: var(--canvas);
  color: var(--ink);
  font-size: 1rem;
  line-height: 1.5;
}

a {
  color: #007a48;
  text-decoration-thickness: 0.11em;
  text-underline-offset: 0.16em;
}

a:hover {
  color: #005c36;
}

a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--ink);
  outline-offset: 3px;
}

p,
li,
dd,
dt,
small,
.meta,
.caption {
  font-size: 1rem;
}

p {
  margin: 0 0 1rem;
}

h1,
h2,
h3 {
  margin: 0;
  color: var(--ink);
  font-weight: 700;
  line-height: 1.08;
}

h1 {
  max-width: 15ch;
  font-size: clamp(2.4rem, 5vw, 2.667rem);
  letter-spacing: -0.045rem;
}

h2 {
  margin-bottom: 1rem;
  font-size: 1.833rem;
  letter-spacing: -0.025rem;
}

h3 {
  font-size: 1.5rem;
  letter-spacing: -0.015rem;
}

strong,
.number {
  font-weight: 700;
}

.skip-link {
  position: fixed;
  z-index: 20;
  top: 0.75rem;
  left: 0.75rem;
  min-height: 44px;
  padding: 0.65rem 1rem;
  transform: translateY(-180%);
  border-radius: 0.875rem;
  background: var(--ink);
  color: var(--surface);
}

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

.site-shell {
  display: grid;
  grid-template-columns: minmax(220px, 260px) minmax(0, 760px);
  gap: clamp(2rem, 5vw, 5.5rem);
  width: min(1180px, calc(100% - 3rem));
  margin: 0 auto;
  padding: 2rem 0 4rem;
}

.side-index {
  align-self: start;
  position: sticky;
  top: 1.25rem;
  padding: 1rem;
  border-radius: 1.5rem;
  background: var(--surface);
  box-shadow: 0 12px 34px rgba(18, 168, 98, 0.09);
}

.site-name {
  display: flex;
  align-items: center;
  min-height: 48px;
  padding: 0.5rem;
  color: var(--ink);
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1.15;
  text-decoration: none;
}

.site-name::before {
  width: 1rem;
  height: 1rem;
  margin-right: 0.65rem;
  border-radius: 999px;
  background: var(--mint);
  box-shadow: 0 0 0 0.35rem var(--mint-soft);
  content: "";
  flex: 0 0 auto;
}

.side-label {
  margin: 0.75rem 0 0.45rem;
  padding: 0 0.5rem;
  color: var(--muted);
  font-size: 1rem;
  font-weight: 600;
}

.side-index ol {
  display: grid;
  gap: 0.25rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.side-index li {
  margin: 0;
}

.side-index nav a {
  display: flex;
  align-items: center;
  min-height: 48px;
  padding: 0.65rem 0.75rem;
  border-radius: 0.75rem;
  color: var(--muted);
  font-weight: 600;
  text-decoration: none;
}

.side-index nav a:hover {
  background: var(--mint-soft);
  color: var(--ink);
}

.side-index nav a[aria-current="page"] {
  background: var(--mint-bright);
  color: var(--ink-on-mint);
}

.side-note {
  margin: 1rem 0.5rem 0;
  color: var(--muted);
  font-size: 1rem;
}

.page {
  min-width: 0;
}

.hero {
  position: relative;
  overflow: hidden;
  min-height: 390px;
  padding: clamp(1.5rem, 4vw, 3rem);
  border-radius: 1.5rem;
  background-color: #38db90;
  box-shadow: var(--shadow);
  color: var(--ink-on-mint);
}

.hero::after {
  position: absolute;
  right: -5rem;
  bottom: -6rem;
  width: 18rem;
  height: 18rem;
  border: 2.5rem solid rgba(6, 32, 20, 0.08);
  border-radius: 999px;
  content: "";
}

.hero > * {
  position: relative;
  z-index: 1;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  margin: 0 0 1rem;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  background: rgba(6, 32, 20, 0.1);
  color: var(--ink-on-mint);
  font-size: 1rem;
  font-weight: 600;
}

.hero-mark {
  display: block;
  margin: 1.25rem 0 0.25rem;
  font-size: clamp(3.25rem, 10vw, 5rem);
  font-weight: 700;
  letter-spacing: -0.095rem;
  line-height: 0.92;
}

.hero .lede {
  max-width: 34rem;
  margin: 1.25rem 0 0;
  font-size: 1.125rem;
  line-height: 1.55;
}

.hero-actions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
  max-width: 35rem;
  margin-top: 1.5rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 0.75rem 1rem;
  border-radius: 0.875rem;
  background: rgba(6, 32, 20, 0.86);
  color: var(--surface);
  font-size: 1rem;
  font-weight: 700;
  text-align: center;
  text-decoration: none;
  transition: transform 120ms ease, background-color 120ms ease;
}

.button:hover {
  background: var(--ink-on-mint);
  color: var(--surface);
}

.button:active {
  transform: scale(0.98);
}

.button.secondary {
  background: rgba(255, 255, 255, 0.62);
  color: var(--ink-on-mint);
}

.banner {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.85rem;
  margin: 1.25rem 0 2.5rem;
  padding: 1rem;
  border-radius: 1rem;
  background: var(--surface);
  box-shadow: 0 10px 30px rgba(15, 26, 20, 0.06);
}

.icon-chip,
.row-icon {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border-radius: 0.75rem;
  background: var(--mint-soft);
  color: var(--ink-on-mint);
  font-size: 1.25rem;
  font-weight: 700;
}

.banner strong,
.banner span {
  display: block;
}

.banner-value {
  color: #007a48;
  font-weight: 700;
  text-align: right;
}

.content-section {
  margin: 0 0 3.5rem;
}

.section-intro {
  max-width: 64ch;
  margin-bottom: 1.25rem;
  color: var(--muted);
}

.question-list,
.clean-list,
.source-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-radius: 1rem;
  background: var(--surface);
  box-shadow: 0 10px 32px rgba(15, 26, 20, 0.05);
}

.question-list li,
.clean-list li,
.source-list li {
  border-bottom: 1px solid var(--hairline);
}

.question-list li:last-child,
.clean-list li:last-child,
.source-list li:last-child {
  border-bottom: 0;
}

.question-link {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.9rem;
  min-height: 88px;
  padding: 0.75rem;
  color: var(--ink);
  text-decoration: none;
}

.question-link:hover {
  background: #f0fbf5;
  color: var(--ink);
}

.question-link strong,
.question-link span {
  display: block;
}

.question-link strong {
  font-size: 1.125rem;
  font-weight: 600;
}

.question-link .meta {
  margin-top: 0.25rem;
  color: var(--muted);
}

.arrow {
  color: #007a48;
  font-size: 1.35rem;
  font-weight: 700;
}

.answer-stack {
  display: grid;
  gap: 1rem;
}

.answer-card,
.depth-card,
.source-card {
  padding: clamp(1.25rem, 3vw, 1.75rem);
  border-radius: 1rem;
  background: var(--surface);
  box-shadow: 0 10px 32px rgba(15, 26, 20, 0.05);
}

.answer-card h2,
.answer-card h3,
.depth-card h2,
.depth-card h3 {
  margin-bottom: 0.75rem;
}

.answer-card p:last-child,
.depth-card p:last-child,
.source-card p:last-child {
  margin-bottom: 0;
}

.answer-card.summary {
  background: var(--mint-soft);
}

.answer-card.caution {
  background: var(--amber);
  color: var(--amber-ink);
}

.answer-card.caution h2,
.answer-card.caution h3 {
  color: var(--amber-ink);
}

.answer-card.urgent {
  background: var(--coral);
  color: var(--coral-ink);
}

.answer-card.urgent h2,
.answer-card.urgent h3 {
  color: var(--coral-ink);
}

.status-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.9rem;
}

.chip {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 0.3rem 0.7rem;
  border-radius: 999px;
  background: var(--mint-soft);
  color: var(--ink-on-mint);
  font-size: 1rem;
  font-weight: 600;
}

.chip.active {
  background: var(--mint-bright);
}

.chip.amber {
  background: var(--amber);
  color: var(--amber-ink);
}

.chip.coral {
  background: var(--coral);
  color: var(--coral-ink);
}

.diagram {
  display: grid;
  gap: 0.75rem;
  margin: 1.25rem 0;
  padding: 1rem;
  border-radius: 1rem;
  background: var(--surface);
  box-shadow: 0 10px 32px rgba(15, 26, 20, 0.05);
}

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

.diagram-node {
  position: relative;
  min-height: 136px;
  padding: 1rem;
  border-radius: 0.875rem;
  background: var(--mint-soft);
}

.diagram-node:nth-child(even) {
  background: #d5f4e5;
}

.diagram-node strong,
.diagram-node span {
  display: block;
}

.diagram-node strong {
  margin-bottom: 0.35rem;
  font-size: 1.125rem;
  font-weight: 700;
}

.diagram-node span {
  color: var(--muted);
}

.cost-formula {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.5rem;
  margin: 1.25rem 0;
}

.cost-part {
  display: grid;
  place-items: center;
  min-height: 106px;
  padding: 0.75rem;
  border-radius: 0.875rem;
  background: var(--mint-soft);
  font-weight: 700;
  text-align: center;
}

.row {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: 0.9rem;
  align-items: start;
  padding: 1rem;
  animation: row-in 250ms ease-out both;
}

.row:nth-child(2) {
  animation-delay: 40ms;
}

.row:nth-child(3) {
  animation-delay: 80ms;
}

.row:nth-child(4) {
  animation-delay: 120ms;
}

.row:nth-child(5) {
  animation-delay: 160ms;
}

.row-title {
  display: block;
  margin-bottom: 0.25rem;
  font-size: 1.125rem;
  font-weight: 600;
}

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

.checklist {
  margin: 0;
  padding: 0;
  list-style: none;
}

.checklist li {
  position: relative;
  min-height: 44px;
  padding: 0.55rem 0 0.55rem 2.25rem;
}

.checklist li::before {
  position: absolute;
  top: 0.65rem;
  left: 0;
  display: grid;
  place-items: center;
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 999px;
  background: var(--mint);
  color: var(--ink-on-mint);
  content: "✓";
  font-weight: 700;
}

.toast {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 0.85rem;
  align-items: center;
  margin: 1.5rem 0;
  padding: 1rem;
  border-radius: 1rem;
  background: var(--surface);
  box-shadow: var(--shadow);
  animation: toast-in 350ms cubic-bezier(0.22, 1.2, 0.36, 1) both;
}

.toast-check {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 999px;
  background: var(--mint);
  color: var(--ink-on-mint);
  font-size: 1.25rem;
  font-weight: 700;
}

.source-list a {
  display: block;
  min-height: 72px;
  padding: 1rem;
  color: var(--ink);
  text-decoration: none;
}

.source-list a:hover {
  background: var(--mint-soft);
}

.source-list strong,
.source-list span {
  display: block;
}

.source-list strong {
  font-size: 1.125rem;
  font-weight: 600;
}

.source-list span {
  margin-top: 0.25rem;
  color: var(--muted);
}

.next-link {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 1rem;
  min-height: 72px;
  margin-top: 2rem;
  padding: 1rem 1.25rem;
  border-radius: 1rem;
  background: var(--mint-soft);
  color: var(--ink);
  font-weight: 700;
  text-decoration: none;
}

.next-link:hover {
  background: #cff1df;
  color: var(--ink);
}

.site-footer {
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid var(--hairline);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin: 0 0 1rem;
  padding: 0;
  list-style: none;
}

.footer-links a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0.5rem 0.7rem;
  border-radius: 0.75rem;
  color: var(--ink);
  font-weight: 600;
}

.footer-line {
  max-width: 62ch;
  margin: 0;
  color: var(--muted);
}

.missing-page {
  display: grid;
  min-height: 100vh;
  place-items: center;
  padding: 1.5rem;
}

.missing-card {
  width: min(620px, 100%);
  padding: clamp(1.5rem, 5vw, 3rem);
  border-radius: 1.5rem;
  background-color: #38db90;
  color: var(--ink-on-mint);
  box-shadow: var(--shadow);
}

.missing-card h1 {
  margin-bottom: 1rem;
}

@keyframes row-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes toast-in {
  from {
    opacity: 0;
    transform: translateY(10px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@media (max-width: 820px) {
  .site-shell {
    grid-template-columns: minmax(0, 1fr);
    gap: 1.25rem;
    width: min(100% - 2rem, 760px);
    padding-top: 1rem;
  }

  .side-index {
    position: static;
  }

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

  .side-index nav a {
    align-items: flex-start;
  }

  .side-note,
  .side-label {
    display: none;
  }

  .hero {
    min-height: 350px;
  }
}

@media (max-width: 560px) {
  h1 {
    font-size: 2.2rem;
  }

  h2 {
    font-size: 1.65rem;
  }

  .hero {
    min-height: 0;
  }

  .hero-actions,
  .diagram.three,
  .cost-formula {
    grid-template-columns: minmax(0, 1fr);
  }

  .banner {
    grid-template-columns: 48px minmax(0, 1fr);
  }

  .banner-value {
    grid-column: 2;
    text-align: left;
  }

  .question-link {
    grid-template-columns: 44px minmax(0, 1fr) 24px;
  }

  .side-index ol {
    grid-template-columns: minmax(0, 1fr);
  }

  .diagram-node {
    min-height: 0;
  }
}

@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;
  }
}