:root {
  --ink: #13221c;
  --ink-soft: #3d5248;
  --paper: #f3f6f2;
  --paper-2: #e7efe8;
  --line: #c5d4c9;
  --brand: #0f6b4c;
  --brand-deep: #0a4633;
  --accent: #c45c26;
  --white: #ffffff;
  --shadow: 0 18px 50px rgba(19, 34, 28, 0.08);
  --radius: 18px;
  --max: 1080px;
  --font-display: "Fraunces", Georgia, serif;
  --font-body: "Manrope", "Segoe UI", sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  background:
    radial-gradient(1200px 500px at 10% -10%, rgba(15, 107, 76, 0.12), transparent 60%),
    radial-gradient(900px 420px at 100% 0%, rgba(196, 92, 38, 0.1), transparent 55%),
    linear-gradient(180deg, #f7faf7 0%, var(--paper) 40%, #eef3ef 100%);
  min-height: 100vh;
}

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

a {
  color: var(--brand-deep);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

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

.wrap {
  width: min(100% - 2rem, var(--max));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(14px);
  background: rgba(243, 246, 242, 0.86);
  border-bottom: 1px solid rgba(197, 212, 201, 0.7);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 0;
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  text-decoration: none;
  color: inherit;
}

.brand strong {
  font-family: var(--font-display);
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

.brand span {
  font-size: 0.75rem;
  color: var(--ink-soft);
}

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

.nav-links a {
  text-decoration: none;
  color: var(--ink-soft);
  font-weight: 600;
  font-size: 0.92rem;
}

.nav-links a[aria-current="page"],
.nav-links a:hover {
  color: var(--brand-deep);
}

.hero {
  padding: 4.5rem 0 3rem;
}

.hero-grid {
  display: grid;
  gap: 2rem;
  align-items: end;
}

@media (min-width: 860px) {
  .hero-grid {
    grid-template-columns: 1.35fr 1fr;
  }
}

.eyebrow {
  display: inline-block;
  margin-bottom: 0.85rem;
  color: var(--brand);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.78rem;
}

h1,
h2,
h3 {
  font-family: var(--font-display);
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin: 0 0 0.8rem;
}

h1 {
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  max-width: 14ch;
}

h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
}

.lead {
  font-size: 1.08rem;
  color: var(--ink-soft);
  max-width: 42ch;
  margin: 0 0 1.5rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  border-radius: 999px;
  padding: 0.85rem 1.25rem;
  font-weight: 700;
  text-decoration: none;
  border: 1px solid transparent;
  transition: transform 0.2s ease, background 0.2s ease, color 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--brand);
  color: var(--white);
}

.btn-primary:hover {
  background: var(--brand-deep);
  color: var(--white);
}

.btn-ghost {
  background: transparent;
  border-color: var(--line);
  color: var(--ink);
}

.hero-panel {
  background: linear-gradient(160deg, var(--brand-deep), #145a42 55%, #1d6f52);
  color: #edf7f1;
  border-radius: calc(var(--radius) + 8px);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  min-height: 280px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  overflow: hidden;
}

.hero-panel::after {
  content: "";
  position: absolute;
  inset: auto -20% -35% 35%;
  height: 220px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.18), transparent 65%);
  pointer-events: none;
}

.hero-panel h2 {
  font-size: 1.45rem;
  margin-bottom: 0.5rem;
}

.hero-panel p {
  margin: 0;
  color: rgba(237, 247, 241, 0.88);
}

.stat-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.stat {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 14px;
  padding: 0.8rem;
}

.stat strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1.15rem;
}

.stat span {
  font-size: 0.78rem;
  opacity: 0.85;
}

.section {
  padding: 2.75rem 0;
}

.section-head {
  margin-bottom: 1.5rem;
  max-width: 55ch;
}

.section-head p {
  margin: 0;
  color: var(--ink-soft);
}

.panel {
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid rgba(197, 212, 201, 0.85);
  border-radius: var(--radius);
  padding: 1.35rem 1.4rem;
  box-shadow: var(--shadow);
}

.stack > * + * {
  margin-top: 1rem;
}

.feature-list {
  display: grid;
  gap: 1rem;
}

@media (min-width: 760px) {
  .feature-list {
    grid-template-columns: repeat(3, 1fr);
  }
}

.feature {
  padding: 1.2rem;
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.65);
  border: 1px solid var(--line);
}

.feature h3 {
  font-size: 1.15rem;
}

.feature p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

.meta-grid {
  display: grid;
  gap: 0.85rem;
}

@media (min-width: 720px) {
  .meta-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.meta-item {
  padding: 1rem 1.1rem;
  border-left: 3px solid var(--brand);
  background: rgba(255, 255, 255, 0.55);
  border-radius: 0 14px 14px 0;
}

.meta-item dt {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
  font-weight: 700;
}

.meta-item dd {
  margin: 0.25rem 0 0;
  font-weight: 600;
}

.prose {
  max-width: 72ch;
}

.prose h2 {
  margin-top: 2rem;
}

.prose p,
.prose li {
  color: var(--ink-soft);
}

.prose ul {
  padding-left: 1.2rem;
}

.page-hero {
  padding: 3.2rem 0 1.2rem;
}

.page-hero p {
  max-width: 55ch;
  color: var(--ink-soft);
  margin: 0;
}

.site-footer {
  margin-top: 3rem;
  border-top: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.45);
  padding: 2rem 0 2.5rem;
}

.footer-grid {
  display: grid;
  gap: 1.25rem;
}

@media (min-width: 800px) {
  .footer-grid {
    grid-template-columns: 1.4fr 1fr 1fr;
  }
}

.site-footer h3 {
  font-size: 1rem;
  margin-bottom: 0.55rem;
}

.site-footer p,
.site-footer li,
.site-footer a {
  color: var(--ink-soft);
  font-size: 0.92rem;
}

.site-footer ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-footer li + li {
  margin-top: 0.35rem;
}

.legal-note {
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  font-size: 0.82rem;
  color: var(--ink-soft);
}

.lang-switch {
  display: inline-flex;
  gap: 0.35rem;
  margin-bottom: 0.85rem;
}

.lang-switch button {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.7);
  border-radius: 999px;
  padding: 0.35rem 0.75rem;
  font: inherit;
  font-size: 0.8rem;
  font-weight: 700;
  cursor: pointer;
  color: var(--ink-soft);
}

.lang-switch button[aria-pressed="true"] {
  background: var(--brand);
  border-color: var(--brand);
  color: white;
}

/* Default: English visible even before JS (avoids blank first paint) */
[data-lang-block="zh"] {
  display: none;
}

[data-lang-block="en"] {
  display: block;
}

.inline-lang[data-lang-block="en"],
.nav [data-lang-block="en"] {
  display: inline;
}

.inline-lang[data-lang-block="zh"],
.nav [data-lang-block="zh"] {
  display: none;
}

/* Chinese UI mode via data-ui-lang (set by site.js) */
html[data-ui-lang="zh"] [data-lang-block="en"] {
  display: none;
}

html[data-ui-lang="zh"] [data-lang-block="zh"] {
  display: block;
}

html[data-ui-lang="zh"] .inline-lang[data-lang-block="zh"],
html[data-ui-lang="zh"] .nav [data-lang-block="zh"] {
  display: inline;
}

html[data-ui-lang="zh"] .inline-lang[data-lang-block="en"],
html[data-ui-lang="zh"] .nav [data-lang-block="en"] {
  display: none;
}