/* HELLO GPT翻译 — product site */
@import url("https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@400;500;700&family=Outfit:wght@400;500;600;700;800&display=swap");

:root {
  --bg: #f7faf9;
  --surface: #ffffff;
  --ink: #10221f;
  --mute: #5d736e;
  --line: rgba(16, 34, 31, 0.1);
  --teal: #00b39a;
  --teal-deep: #009180;
  --mint: #d8f5ef;
  --max: 1080px;
  --font: "Outfit", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  color: var(--ink);
  background:
    radial-gradient(900px 480px at 90% -10%, rgba(0, 179, 154, 0.16), transparent 55%),
    radial-gradient(700px 400px at 0% 30%, rgba(16, 34, 31, 0.05), transparent 50%),
    var(--bg);
  line-height: 1.65;
  letter-spacing: -0.015em;
}

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

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
  border: 0;
  background: none;
  cursor: pointer;
}

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

/* header */
.top {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(14px);
  background: rgba(247, 250, 249, 0.86);
  border-bottom: 1px solid var(--line);
}

.top-row {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: 0.04em;
}

.brand img {
  width: 34px;
  height: 34px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 0.15rem;
}

.nav a {
  padding: 0.45rem 0.7rem;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--mute);
  border-radius: 8px;
  transition: color 0.2s ease, background 0.2s ease;
}

.nav a:hover,
.nav a.on {
  color: var(--ink);
  background: rgba(0, 179, 154, 0.1);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.8rem 1.2rem;
  border-radius: 10px;
  font-weight: 700;
  font-size: 0.92rem;
  transition: transform 0.18s ease, background 0.18s ease;
}

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

.btn-teal {
  background: var(--teal);
  color: #fff;
}

.btn-teal:hover {
  background: var(--teal-deep);
}

.btn-ink {
  background: var(--ink);
  color: #fff;
}

.btn-line {
  background: transparent;
  color: var(--ink);
  box-shadow: inset 0 0 0 1.5px var(--ink);
}

.burger {
  display: none;
  width: 42px;
  height: 42px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--surface);
}

.burger i {
  display: block;
  width: 16px;
  height: 2px;
  margin: 4px auto;
  background: var(--ink);
}

.drawer {
  display: none;
}

/* hero */
.hero {
  padding: 4.5rem 0 4rem;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 2rem;
  align-items: center;
}

.hero h1 {
  margin: 0 0 0.85rem;
  font-size: clamp(3.2rem, 9vw, 5.6rem);
  line-height: 0.95;
  font-weight: 800;
  letter-spacing: 0.02em;
  animation: up 0.7s ease both;
}

.hero h1 span {
  color: var(--teal);
}

.hero .lead {
  margin: 0 0 1.6rem;
  color: var(--mute);
  font-size: 1.12rem;
  max-width: 32ch;
  animation: up 0.7s ease 0.08s both;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  animation: up 0.7s ease 0.16s both;
}

.hero-card {
  min-height: 340px;
  border-radius: 28px;
  background:
    linear-gradient(160deg, var(--mint), #fff 55%),
    radial-gradient(circle at 70% 20%, rgba(0, 179, 154, 0.35), transparent 50%);
  border: 1px solid var(--line);
  display: grid;
  place-items: center;
  box-shadow: 0 24px 50px rgba(16, 34, 31, 0.08);
}

.hero-card img {
  width: min(180px, 48%);
  animation: bob 4.8s ease-in-out infinite;
}

/* page */
.page-head {
  padding: 3rem 0 1.5rem;
  border-bottom: 1px solid var(--line);
  margin-bottom: 2rem;
}

.page-head h1 {
  margin: 0 0 0.6rem;
  font-size: clamp(2.1rem, 5vw, 3.3rem);
  font-weight: 800;
  letter-spacing: -0.03em;
}

.page-head p {
  margin: 0;
  color: var(--mute);
  max-width: 46ch;
}

.block {
  padding: 2.5rem 0;
}

.block + .block {
  border-top: 1px solid var(--line);
}

.block h2 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 800;
  letter-spacing: -0.03em;
}

.block .intro {
  margin: 0 0 1.5rem;
  color: var(--mute);
  max-width: 46ch;
}

.grid3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.tile {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 1.35rem 1.2rem;
}

.tile .n {
  display: block;
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--teal);
  margin-bottom: 0.4rem;
  letter-spacing: -0.03em;
}

.tile h3 {
  margin: 0 0 0.35rem;
  font-size: 1.08rem;
}

.tile p {
  margin: 0;
  color: var(--mute);
  font-size: 0.95rem;
}

.tile .btn {
  margin-top: 1rem;
}

.rows {
  display: grid;
}

.row {
  display: grid;
  grid-template-columns: 3.2rem 1fr;
  gap: 0.9rem;
  padding: 1.1rem 0;
  border-top: 1px solid var(--line);
}

.row:last-child {
  border-bottom: 1px solid var(--line);
}

.row .n {
  font-weight: 800;
  color: var(--teal);
  font-size: 1.15rem;
}

.row h3 {
  margin: 0 0 0.25rem;
  font-size: 1.05rem;
}

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

.duo {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 1.75rem;
  align-items: center;
}

.panel {
  min-height: 260px;
  border-radius: 24px;
  border: 1px solid var(--line);
  background: linear-gradient(155deg, var(--mint), #fff);
  display: grid;
  place-items: center;
}

.panel img {
  width: min(160px, 50%);
  animation: bob 5s ease-in-out infinite;
}

.faq details {
  border-top: 1px solid var(--line);
  padding: 0.95rem 0;
}

.faq details:last-child {
  border-bottom: 1px solid var(--line);
}

.faq summary {
  cursor: pointer;
  font-weight: 700;
  list-style: none;
}

.faq summary::-webkit-details-marker {
  display: none;
}

.faq details p {
  margin: 0.6rem 0 0;
  color: var(--mute);
}

.note {
  margin-top: 1.2rem;
  padding: 0.9rem 1rem;
  border-radius: 12px;
  background: rgba(0, 179, 154, 0.1);
  border-left: 3px solid var(--teal);
  color: var(--mute);
}

.banner {
  margin: 2rem 0 3rem;
  padding: 2rem;
  border-radius: 22px;
  background: var(--ink);
  color: #fff;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.banner h2 {
  margin: 0 0 0.35rem;
  font-size: clamp(1.4rem, 3vw, 1.9rem);
}

.banner p {
  margin: 0;
  opacity: 0.78;
}

.foot {
  border-top: 1px solid var(--line);
  padding: 2.25rem 0 1.75rem;
  background: rgba(255, 255, 255, 0.55);
}

.foot-grid {
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 1fr);
  gap: 1.5rem;
}

.foot-brand {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  margin-bottom: 0.5rem;
}

.foot-brand img {
  width: 24px;
  height: 24px;
}

.foot p {
  margin: 0;
  color: var(--mute);
  font-size: 0.92rem;
  max-width: 28ch;
}

.foot h4 {
  margin: 0 0 0.55rem;
  font-size: 0.85rem;
}

.foot a {
  display: block;
  color: var(--mute);
  font-size: 0.9rem;
  margin-bottom: 0.35rem;
}

.foot a:hover {
  color: var(--ink);
}

.foot-bottom {
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem;
  color: var(--mute);
  font-size: 0.82rem;
}

.links a {
  color: var(--teal-deep);
  font-weight: 700;
}

@keyframes up {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

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

@media (max-width: 900px) {
  .nav,
  .top-row > .btn {
    display: none;
  }

  .burger {
    display: block;
  }

  .drawer.open {
    display: grid;
    gap: 0.2rem;
    padding: 0 0 1rem;
  }

  .drawer a {
    padding: 0.65rem 0.2rem;
    font-weight: 600;
  }

  .hero,
  .duo,
  .grid3,
  .foot-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 2.5rem;
  }
}

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