:root {
  --ink: #14212b;
  --ink-soft: #3d4f5c;
  --muted: #6b7c88;
  --paper: #f3f7f4;
  --paper-2: #e8f0ea;
  --line: rgba(20, 33, 43, 0.1);
  --accent: #0f8a6a;
  --accent-deep: #0a5f4a;
  --accent-glow: rgba(15, 138, 106, 0.18);
  --free: #c45c26;
  --card: rgba(255, 255, 255, 0.72);
  --shadow: 0 18px 50px rgba(20, 33, 43, 0.08);
  --radius: 1.25rem;
  --font-display: "Fraunces", "Songti SC", "Noto Serif SC", serif;
  --font-body: "Manrope", "PingFang SC", "Noto Sans SC", sans-serif;
  color-scheme: light;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  color: var(--ink);
  background:
    radial-gradient(1200px 600px at 85% -10%, rgba(15, 138, 106, 0.16), transparent 60%),
    radial-gradient(900px 500px at -10% 20%, rgba(196, 92, 38, 0.1), transparent 55%),
    linear-gradient(180deg, #f7faf8 0%, var(--paper) 40%, #eef4f0 100%);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--accent-deep);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(14px);
  background: rgba(243, 247, 244, 0.82);
  border-bottom: 1px solid var(--line);
}

.header-inner,
.wrap {
  width: min(1080px, calc(100% - 2rem));
  margin: 0 auto;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 0;
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 0.45rem;
  color: inherit;
  text-decoration: none;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.brand-mark {
  font-family: var(--font-display);
  font-size: 1.35rem;
}

.brand-zh {
  color: var(--muted);
  font-weight: 600;
  font-size: 0.95rem;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}

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

.header-nav a:hover {
  color: var(--accent-deep);
}

.lang-switch {
  display: inline-flex;
  border: 1px solid var(--line);
  border-radius: 999px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.7);
}

.lang-switch button {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 0.8rem;
  font-weight: 700;
  padding: 0.4rem 0.7rem;
  cursor: pointer;
}

.lang-switch button[aria-pressed="true"] {
  background: var(--ink);
  color: #fff;
}

[data-lang-content] {
  display: none !important;
}

html[data-lang="en"] [data-lang-content="en"],
html[data-lang="zh"] [data-lang-content="zh"] {
  display: revert !important;
}

.hero {
  padding: 4.5rem 0 3rem;
  display: grid;
  gap: 2rem;
}

@media (min-width: 900px) {
  .hero {
    grid-template-columns: 1.15fr 0.85fr;
    align-items: center;
    min-height: min(78vh, 720px);
    padding-top: 5rem;
  }
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--free);
  margin: 0 0 1rem;
}

.pill-free {
  display: inline-block;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  background: rgba(196, 92, 38, 0.12);
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 6vw, 4.4rem);
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin: 0 0 1rem;
}

.hero-lead {
  font-size: 1.15rem;
  color: var(--ink-soft);
  max-width: 36rem;
  margin: 0 0 1.75rem;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
  margin-bottom: 1rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  border-radius: 999px;
  padding: 0.85rem 1.35rem;
  font-weight: 700;
  text-decoration: none;
  border: 1px solid transparent;
  transition: transform 0.2s ease, background 0.2s ease, box-shadow 0.2s ease;
}

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

.btn-primary {
  background: var(--ink);
  color: #fff;
  box-shadow: 0 10px 28px rgba(20, 33, 43, 0.22);
}

.btn-primary:hover {
  background: #1d2f3b;
  color: #fff;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.7);
  border-color: var(--line);
  color: var(--ink);
}

.fine-print {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.hero-visual {
  position: relative;
  min-height: 320px;
  border-radius: calc(var(--radius) + 0.4rem);
  background:
    linear-gradient(145deg, rgba(15, 138, 106, 0.92), rgba(10, 95, 74, 0.95)),
    radial-gradient(circle at 20% 20%, rgba(255, 255, 255, 0.25), transparent 45%);
  box-shadow: var(--shadow);
  overflow: hidden;
  color: #fff;
  padding: 1.5rem;
  animation: rise-in 0.8s ease both;
}

.hero-visual::before {
  content: "";
  position: absolute;
  inset: auto -20% -35% 20%;
  height: 70%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.18), transparent 65%);
  animation: drift 8s ease-in-out infinite alternate;
}

.phone-card {
  position: relative;
  z-index: 1;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 1.5rem;
  padding: 1.25rem;
  backdrop-filter: blur(8px);
  animation: float-soft 5.5s ease-in-out infinite;
}

.phone-card .label {
  opacity: 0.8;
  font-size: 0.85rem;
  margin-bottom: 0.35rem;
}

.phone-card .spoken {
  font-family: var(--font-display);
  font-size: 1.45rem;
  margin: 0 0 1rem;
}

.phone-card .result {
  font-size: 2.4rem;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.section {
  padding: 3.5rem 0;
}

.section-head {
  max-width: 40rem;
  margin-bottom: 2rem;
}

.section-head h2 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  letter-spacing: -0.02em;
  margin: 0 0 0.6rem;
  line-height: 1.15;
}

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

.grid-3 {
  display: grid;
  gap: 1rem;
}

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

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.35rem;
  box-shadow: var(--shadow);
}

.card h3 {
  margin: 0 0 0.5rem;
  font-size: 1.1rem;
}

.card p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.96rem;
}

.feature-icon {
  width: 2.4rem;
  height: 2.4rem;
  border-radius: 0.8rem;
  display: grid;
  place-items: center;
  background: var(--accent-glow);
  color: var(--accent-deep);
  font-weight: 800;
  margin-bottom: 0.9rem;
}

.steps {
  display: grid;
  gap: 1rem;
}

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

.step {
  position: relative;
  padding: 1.4rem;
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.55);
  border: 1px solid var(--line);
}

.step-num {
  font-family: var(--font-display);
  font-size: 2rem;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 0.6rem;
}

.banner-free {
  margin: 1rem 0 3rem;
  padding: 1.5rem 1.6rem;
  border-radius: var(--radius);
  background: linear-gradient(120deg, rgba(15, 138, 106, 0.12), rgba(196, 92, 38, 0.1));
  border: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
}

.banner-free h2 {
  font-family: var(--font-display);
  margin: 0 0 0.35rem;
  font-size: 1.55rem;
}

.banner-free p {
  margin: 0;
  color: var(--ink-soft);
}

.page {
  padding: 2.5rem 0 4rem;
}

.page h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 2.8rem);
  letter-spacing: -0.02em;
  margin: 0 0 0.5rem;
  line-height: 1.15;
}

.lede {
  color: var(--ink-soft);
  font-size: 1.05rem;
  max-width: 42rem;
}

.prose {
  background: rgba(255, 255, 255, 0.62);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.5rem 1.4rem;
  box-shadow: var(--shadow);
}

.prose h2 {
  font-size: 1.2rem;
  margin: 1.6rem 0 0.55rem;
}

.prose h2:first-child {
  margin-top: 0;
}

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

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

.faq details {
  border: 1px solid var(--line);
  border-radius: 0.9rem;
  background: rgba(255, 255, 255, 0.65);
  padding: 0.9rem 1rem;
  margin-bottom: 0.7rem;
}

.faq summary {
  cursor: pointer;
  font-weight: 700;
}

.faq details[open] summary {
  margin-bottom: 0.45rem;
  color: var(--accent-deep);
}

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

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  background: rgba(20, 33, 43, 0.07);
  padding: 0.1em 0.35em;
  border-radius: 0.35rem;
  font-size: 0.92em;
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 2rem 0 2.5rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: space-between;
  align-items: center;
}

.footer-links {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

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

@keyframes rise-in {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes float-soft {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-8px);
  }
}

@keyframes drift {
  from {
    transform: translateX(0);
  }
  to {
    transform: translateX(-40px);
  }
}

.hero-copy {
  animation: rise-in 0.7s ease both;
}

.card,
.step {
  animation: rise-in 0.7s ease both;
}

.card:nth-child(2),
.step:nth-child(2) {
  animation-delay: 0.08s;
}

.card:nth-child(3),
.step:nth-child(3) {
  animation-delay: 0.16s;
}

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