:root {
  --bg: #fbfaf8;
  --surface: #ffffff;
  --surface-muted: #f2f6f4;
  --surface-green: #edf8f1;
  --surface-blue: #eef5ff;
  --text: #17202a;
  --muted: #5f6b76;
  --line: #dbe4dd;
  --accent: #2563eb;
  --accent-strong: #1d4ed8;
  --green: #217a4b;
  --green-strong: #145a35;
  --shadow: 0 22px 60px rgba(20, 30, 45, 0.13);
  --radius: 8px;
  --container: 1080px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  line-height: 1.6;
}

:lang(zh-Hans),
:lang(zh-Hant),
:lang(ja) {
  word-break: normal;
  overflow-wrap: anywhere;
}

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

a {
  color: inherit;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(251, 250, 248, 0.9);
  border-bottom: 1px solid rgba(219, 228, 221, 0.9);
  backdrop-filter: blur(18px);
}

.nav {
  width: min(100% - 32px, var(--container));
  min-height: 66px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 780;
  text-decoration: none;
}

.brand-mark {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  box-shadow: 0 8px 18px rgba(15, 23, 42, 0.16);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 20px;
  color: var(--muted);
  font-size: 14px;
}

.nav-links a {
  text-decoration: none;
}

.nav-links a:hover,
.language-switcher a:hover,
.footer a:hover {
  color: var(--accent);
}

.nav-button {
  padding: 8px 13px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  font-weight: 680;
}

.language-switcher {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.74);
  color: var(--muted);
  font-size: 13px;
}

.language-switcher a {
  min-width: 28px;
  padding: 4px 7px;
  border-radius: 6px;
  text-align: center;
  text-decoration: none;
}

.language-switcher a[aria-current="page"] {
  background: var(--surface-green);
  color: var(--green-strong);
  font-weight: 760;
}

.container {
  width: calc(100% - 32px);
  max-width: var(--container);
  margin: 0 auto;
}

.hero {
  padding: 92px 0 84px;
  border-bottom: 1px solid var(--line);
  background:
    linear-gradient(120deg, rgba(237, 248, 241, 0.95), rgba(251, 250, 248, 0.94) 46%, rgba(238, 245, 255, 0.92)),
    var(--bg);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(320px, 0.95fr);
  gap: 64px;
  align-items: center;
}

.hero-copy {
  min-width: 0;
  max-width: 700px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--green-strong);
  font-size: 12px;
  font-weight: 780;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 22px;
  max-width: 760px;
  font-size: 76px;
  line-height: 0.98;
  letter-spacing: 0;
  overflow-wrap: break-word;
}

h2 {
  margin-bottom: 16px;
  font-size: 48px;
  line-height: 1.06;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 9px;
  font-size: 20px;
  line-height: 1.25;
  letter-spacing: 0;
}

.hero-lede {
  max-width: 660px;
  color: #2f3d48;
  font-size: 23px;
  line-height: 1.4;
}

.hero-note {
  max-width: 640px;
  margin-bottom: 0;
  color: var(--muted);
  font-size: 17px;
}

.name-note {
  max-width: 620px;
  margin: 20px 0 0;
  padding-left: 14px;
  border-left: 3px solid rgba(33, 122, 75, 0.34);
  color: #485662;
  font-size: 15px;
  line-height: 1.55;
}

.name-note strong {
  color: var(--text);
  font-weight: 760;
}

.mobile-line {
  display: inline;
}

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

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  max-width: 100%;
  min-height: 44px;
  padding: 0 18px;
  border-radius: 8px;
  font-weight: 740;
  text-decoration: none;
}

.button.primary {
  background: var(--accent);
  color: #ffffff;
}

.button.primary:hover {
  background: var(--accent-strong);
}

.button.secondary {
  background: var(--surface);
  border: 1px solid var(--line);
  color: var(--text);
}

.button.secondary.dark {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.28);
  color: #ffffff;
}

.hero-panel {
  position: relative;
  min-width: 0;
  padding: 28px;
  border: 1px solid rgba(33, 122, 75, 0.2);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.82);
  box-shadow: var(--shadow);
}

.hero-icon {
  width: 84px;
  height: 84px;
  margin-bottom: 24px;
  border-radius: 18px;
  box-shadow: 0 16px 32px rgba(15, 23, 42, 0.16);
}

.rewrite-demo {
  display: grid;
  gap: 12px;
}

.rewrite-demo p {
  margin: 0;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #ffffff;
  color: #344250;
  font-size: 17px;
}

.rewrite-demo .demo-result {
  border-color: rgba(33, 122, 75, 0.28);
  background: var(--surface-green);
  color: #193d2a;
}

.demo-label,
.demo-arrow {
  color: var(--muted);
  font-size: 12px;
  font-weight: 780;
  text-transform: uppercase;
}

.demo-arrow {
  color: var(--green-strong);
}

.section {
  padding: 86px 0;
}

.muted {
  background: var(--surface-muted);
}

.section-heading {
  margin-bottom: 34px;
}

.section-heading.compact {
  max-width: 760px;
  text-align: center;
}

.section-heading h2 {
  max-width: 780px;
}

.section-heading p,
.section-copy,
.limit-list {
  color: var(--muted);
  font-size: 17px;
}

.value-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.value-card,
.step-card,
.difference-grid article {
  min-height: 100%;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.value-card {
  background: var(--surface-green);
  border-color: rgba(33, 122, 75, 0.18);
}

.value-card.highlight {
  background: #e6f6ec;
}

.value-card span,
.step-card span {
  display: inline-flex;
  margin-bottom: 14px;
  color: var(--green-strong);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
}

.value-card p,
.step-card p,
.difference-grid p {
  margin-bottom: 0;
  color: var(--muted);
}

.split-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 56px;
  align-items: start;
}

.step-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 40px;
}

.step-card {
  background: #ffffff;
}

.difference-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.difference-grid article {
  background: var(--surface-blue);
  border-color: rgba(37, 99, 235, 0.14);
}

.screenshot-showcase {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(320px, 0.65fr);
  gap: 20px;
  align-items: stretch;
}

.screenshot {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.primary-shot {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
}

.shot-copy {
  padding: 24px 26px 20px;
  border-bottom: 1px solid var(--line);
  background: #ffffff;
}

.shot-copy span {
  display: inline-flex;
  margin-bottom: 10px;
  color: var(--green-strong);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
}

.shot-copy p {
  max-width: 620px;
  margin-bottom: 0;
  color: var(--muted);
}

.supporting-shots {
  display: grid;
  gap: 20px;
}

.screenshot img {
  width: 100%;
  height: auto;
  max-height: 640px;
  object-fit: cover;
  object-position: top center;
  border-bottom: 1px solid var(--line);
}

.primary-shot img {
  height: 100%;
  min-height: 520px;
}

.compact-shot img {
  max-height: 270px;
}

.screenshot figcaption {
  min-height: 96px;
  padding: 16px 18px;
  color: var(--muted);
  font-size: 14px;
}

.screenshot figcaption strong {
  display: block;
  margin-bottom: 4px;
  color: var(--text);
  font-size: 15px;
}

.limits {
  background: #ffffff;
}

.limit-list {
  display: grid;
  gap: 14px;
  padding: 22px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.limit-list p {
  margin-bottom: 0;
}

.cta {
  padding: 82px 0;
  background: var(--text);
  color: #ffffff;
}

.cta .eyebrow {
  color: #9fd4b5;
}

.cta-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.cta h2 {
  max-width: 660px;
  margin-bottom: 0;
}

.footer {
  padding: 28px 0;
  background: #111922;
  color: #c4ced8;
  font-size: 14px;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 16px;
}

.footer a {
  color: #ffffff;
  text-decoration: none;
}

@media (max-width: 900px) {
  .nav {
    min-height: auto;
    padding: 14px 0;
    align-items: flex-start;
    flex-direction: column;
  }

  .nav-links {
    width: 100%;
    gap: 14px;
    overflow-x: auto;
    padding-bottom: 4px;
  }

  .language-switcher {
    max-width: 100%;
    overflow-x: auto;
  }

  .hero {
    padding: 70px 0 64px;
  }

  .hero-grid,
  .split-layout,
  .screenshot-showcase,
  .step-grid,
  .difference-grid,
  .cta-inner {
    grid-template-columns: 1fr;
  }

  .cta-inner {
    display: grid;
  }

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

  h1 {
    font-size: 56px;
  }

  h2 {
    font-size: 38px;
  }

  .hero-lede {
    font-size: 20px;
  }

  .section {
    padding: 64px 0;
  }

  .primary-shot img {
    min-height: 0;
  }
}

@media (max-width: 560px) {
  .nav-links a:not(.nav-button) {
    display: none;
  }

  .hero-actions,
  .button {
    width: 100%;
  }

  .hero-copy,
  .hero-panel,
  .hero-actions {
    justify-self: start;
    width: calc(100vw - 32px);
    max-width: calc(100vw - 32px);
  }

  .rewrite-demo p {
    max-width: 100%;
  }

  .title-part {
    display: block;
  }

  .mobile-line {
    display: block;
    max-width: calc(100vw - 32px);
  }

  .button {
    flex: 0 0 calc(100vw - 48px);
    width: calc(100vw - 48px);
  }

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

  h1 {
    font-size: 40px;
  }

  h2 {
    font-size: 32px;
  }

  .hero-panel {
    padding: 20px;
  }

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