:root {
  color-scheme: light;
  --paper: #f6f8f3;
  --paper-strong: #ffffff;
  --paper-soft: #eef4ef;
  --ink: #151711;
  --ink-muted: #5c6258;
  --line: #d6ded2;
  --line-strong: #aebbaa;
  --green: #14745d;
  --green-dark: #0e493c;
  --blue: #0f5872;
  --amber: #b05f18;
  --red: #b13d30;
  --shadow: 0 18px 44px rgba(26, 34, 23, 0.09);
  --radius: 8px;
  --max-width: 1120px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background:
    linear-gradient(90deg, rgba(21, 23, 17, 0.035) 1px, transparent 1px),
    linear-gradient(rgba(21, 23, 17, 0.035) 1px, transparent 1px),
    var(--paper);
  background-size: 28px 28px;
  font-family:
    "Avenir Next", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    sans-serif;
  line-height: 1.7;
  text-rendering: optimizeLegibility;
}

img,
svg {
  max-width: 100%;
  display: block;
}

a {
  color: var(--green-dark);
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--amber);
}

:focus-visible {
  outline: 3px solid rgba(20, 116, 93, 0.35);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: 12px;
  z-index: 20;
  transform: translateY(-140%);
  padding: 10px 14px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--paper-strong);
  color: var(--ink);
  font-weight: 700;
  text-decoration: none;
}

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

.site-header,
.site-main,
.site-footer {
  width: min(var(--max-width), calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 22px 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
  text-decoration: none;
}

.brand img {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  box-shadow: 0 10px 24px rgba(15, 88, 114, 0.18);
}

.brand span {
  display: block;
  font-size: 13px;
  color: var(--ink-muted);
}

.brand strong {
  display: block;
  font-size: 18px;
  line-height: 1.1;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 6px;
}

.site-nav a,
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 10px 14px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  color: var(--ink);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  transition:
    background-color 160ms ease,
    border-color 160ms ease,
    color 160ms ease,
    transform 160ms ease;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  border-color: var(--line);
  background: rgba(255, 255, 255, 0.7);
  color: var(--green-dark);
}

.button {
  border-color: var(--ink);
  background: var(--ink);
  color: #fff;
  box-shadow: 0 10px 22px rgba(21, 23, 17, 0.12);
}

.button:hover {
  transform: translateY(-1px);
  background: var(--green-dark);
  border-color: var(--green-dark);
  color: #fff;
}

.button.secondary {
  background: rgba(255, 255, 255, 0.72);
  color: var(--ink);
  border-color: var(--line-strong);
  box-shadow: none;
}

.button.secondary:hover {
  color: var(--green-dark);
  border-color: var(--green);
  background: #fff;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(310px, 0.92fr);
  gap: 36px;
  align-items: center;
  min-height: min(700px, calc(100vh - 88px));
  padding: 54px 0 64px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.hero.compact {
  min-height: auto;
  padding: 50px 0;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  color: var(--green-dark);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.eyebrow::before {
  content: "";
  width: 34px;
  height: 2px;
  background: currentColor;
}

h1,
h2,
h3 {
  margin: 0;
  font-family:
    "Songti SC", "Noto Serif CJK SC", "STSong", Georgia, serif;
  letter-spacing: 0;
  color: var(--ink);
}

h1 {
  max-width: 11ch;
  font-size: clamp(46px, 8vw, 88px);
  line-height: 0.98;
}

.policy-page h1,
.support-page h1 {
  max-width: 12ch;
}

h2 {
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.12;
}

h3 {
  font-size: 21px;
  line-height: 1.35;
}

p {
  margin: 0;
}

.lead {
  max-width: 680px;
  margin-top: 22px;
  color: var(--ink-muted);
  font-size: clamp(17px, 2vw, 20px);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.hero-notes {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.hero-notes li,
.pill {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  padding: 6px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.68);
  color: var(--ink-muted);
  font-size: 13px;
  font-weight: 700;
}

.hero-visual {
  position: relative;
  display: grid;
  gap: 14px;
  justify-items: stretch;
}

.app-plate,
.meter-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.82);
  box-shadow: var(--shadow);
}

.app-plate {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr);
  gap: 18px;
  align-items: center;
  padding: 18px;
}

.app-plate img {
  width: 92px;
  height: 92px;
  border-radius: 20px;
}

.app-plate strong {
  display: block;
  font-size: 28px;
  line-height: 1.05;
}

.app-plate span {
  display: block;
  margin-top: 8px;
  color: var(--ink-muted);
}

.meter-card {
  overflow: hidden;
}

.meter-header,
.meter-footer {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 18px;
  border-bottom: 1px solid var(--line);
  color: var(--ink-muted);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.meter-footer {
  border-top: 1px solid var(--line);
  border-bottom: 0;
  letter-spacing: 0;
  text-transform: none;
}

.meter-reading {
  padding: 30px 18px 22px;
  text-align: center;
}

.lux-number {
  font-family:
    "Avenir Next", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    sans-serif;
  font-size: clamp(56px, 9vw, 92px);
  font-weight: 800;
  line-height: 0.95;
  color: var(--green-dark);
}

.lux-unit {
  margin-top: 8px;
  color: var(--ink-muted);
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.meter-scale {
  position: relative;
  height: 12px;
  margin: 26px auto 0;
  overflow: hidden;
  border-radius: 999px;
  background:
    linear-gradient(90deg, #1f4d72 0%, #2b8968 38%, #f0b24a 72%, #c94c37 100%);
}

.meter-scale::after {
  content: "";
  position: absolute;
  left: 52%;
  top: -5px;
  width: 4px;
  height: 22px;
  border-radius: 999px;
  background: var(--ink);
}

.section-band {
  padding: 62px 0;
  border-bottom: 1px solid var(--line);
}

.section-band:last-child {
  border-bottom: 0;
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(0, 0.75fr) minmax(0, 1fr);
  gap: 32px;
  align-items: end;
  margin-bottom: 28px;
}

.section-heading p {
  color: var(--ink-muted);
  font-size: 17px;
}

.grid {
  display: grid;
  gap: 16px;
}

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

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

.tile,
.resource-card,
.contact-block,
.notice,
.policy-summary {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.76);
}

.tile,
.resource-card,
.contact-block,
.notice {
  padding: 22px;
}

.tile strong,
.resource-card strong,
.contact-block strong,
.notice strong {
  display: block;
  margin-bottom: 10px;
  color: var(--ink);
  font-size: 18px;
}

.tile p,
.resource-card p,
.contact-block p,
.notice p,
.policy-summary p,
.policy-section p,
.policy-section li,
.support-list li {
  color: var(--ink-muted);
}

.resource-card {
  display: grid;
  gap: 16px;
}

.resource-card .button {
  width: fit-content;
}

.contact-block a {
  display: inline-block;
  margin-top: 4px;
  overflow-wrap: anywhere;
  font-size: 20px;
  font-weight: 800;
}

.notice {
  background: #fff8ea;
  border-color: #e7c78c;
}

.notice.spaced {
  margin-top: 16px;
}

.notice strong {
  color: var(--amber);
}

.legal-line {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin-top: 30px;
}

.hero-visual .legal-line {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 0;
}

.legal-line div,
.policy-summary div {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.62);
}

.label {
  display: block;
  margin-bottom: 6px;
  color: var(--ink-muted);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.value {
  display: block;
  color: var(--ink);
  font-weight: 800;
  overflow-wrap: anywhere;
}

.steps {
  counter-reset: step;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.step {
  counter-increment: step;
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 16px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}

.step::before {
  content: counter(step, decimal-leading-zero);
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: var(--radius);
  background: var(--ink);
  color: #fff;
  font-size: 13px;
  font-weight: 800;
}

.support-list,
.policy-section ul {
  margin: 0;
  padding-left: 20px;
}

.support-list li + li,
.policy-section li + li {
  margin-top: 10px;
}

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

details {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.76);
}

summary {
  cursor: pointer;
  padding: 18px 20px;
  color: var(--ink);
  font-weight: 800;
}

details p {
  padding: 0 20px 20px;
  color: var(--ink-muted);
}

.policy-summary {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  padding: 12px;
}

.policy-layout {
  display: grid;
  grid-template-columns: minmax(220px, 0.36fr) minmax(0, 1fr);
  gap: 34px;
  align-items: start;
}

.toc {
  position: sticky;
  top: 18px;
  display: grid;
  gap: 8px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.76);
}

.toc a {
  color: var(--ink-muted);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
}

.toc a:hover {
  color: var(--green-dark);
}

.policy-section {
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
}

.policy-section:first-child {
  padding-top: 0;
}

.policy-section h2 {
  margin-bottom: 16px;
  font-size: clamp(24px, 3vw, 34px);
}

.policy-section p + p,
.policy-section p + ul,
.policy-section ul + p {
  margin-top: 14px;
}

code {
  padding: 2px 7px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.82);
  color: var(--green-dark);
  font-family:
    "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.92em;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 26px 0 42px;
  color: var(--ink-muted);
  font-size: 14px;
}

.site-footer a {
  font-weight: 800;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition: none !important;
  }
}

@media (max-width: 900px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .site-nav {
    justify-content: flex-start;
  }

  .hero,
  .section-heading,
  .grid.two,
  .grid.three,
  .policy-layout,
  .policy-summary {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
  }

  .legal-line {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .toc {
    position: static;
  }
}

@media (max-width: 640px) {
  .site-header,
  .site-main,
  .site-footer {
    width: min(var(--max-width), calc(100% - 24px));
  }

  .site-header {
    padding: 16px 0;
  }

  .site-nav {
    width: 100%;
  }

  .site-nav a {
    flex: 1 1 auto;
  }

  .hero,
  .hero.compact {
    gap: 24px;
    padding: 34px 0 42px;
  }

  h1 {
    font-size: 44px;
  }

  .app-plate {
    grid-template-columns: 72px minmax(0, 1fr);
  }

  .app-plate img {
    width: 72px;
    height: 72px;
    border-radius: 16px;
  }

  .app-plate strong {
    font-size: 23px;
  }

  .section-band {
    padding: 42px 0;
  }

  .legal-line {
    grid-template-columns: 1fr;
  }

  .step {
    grid-template-columns: 1fr;
  }

  .site-footer {
    flex-direction: column;
  }
}