:root {
  color-scheme: dark;
  --bg: #030817;
  --panel: rgba(12, 21, 44, 0.78);
  --line: rgba(143, 173, 255, 0.2);
  --text: #f4f7ff;
  --muted: #aab6cf;
  --blue: #5797ff;
  --violet: #8a78ff;
  --glass-soft: rgba(112, 146, 255, 0.08);
  --ease-apple: cubic-bezier(0.22, 1, 0.36, 1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 50% 0%, rgba(78, 125, 255, 0.28), transparent 28%),
    linear-gradient(180deg, #020616 0%, #050a18 50%, #030610 100%);
  font-family: Inter, "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  line-height: 1.7;
}
a { color: inherit; text-decoration: none; }
button { border: 0; cursor: pointer; font: inherit; }
img { display: block; max-width: 100%; height: auto; }
.shell { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }
.site-header {
  position: sticky;
  top: 14px;
  z-index: 30;
  width: min(100% - 40px, 1220px);
  margin: 0 auto;
}
.nav {
  min-height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 0 16px;
  border: 1px solid rgba(143, 173, 255, 0.18);
  border-radius: 14px;
  background: rgba(4, 10, 25, 0.58);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.08), 0 18px 60px rgba(0,0,0,0.28);
  backdrop-filter: blur(18px) saturate(1.18);
  -webkit-backdrop-filter: blur(18px) saturate(1.18);
  transition: background 320ms var(--ease-apple), border-color 320ms var(--ease-apple);
}
.nav.scrolled {
  background: rgba(4, 10, 25, 0.72);
  border-color: rgba(143, 173, 255, 0.24);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.1), 0 22px 70px rgba(0,0,0,0.34);
}
.brand { display: flex; align-items: center; gap: 8px; font-weight: 700; font-size: 17px; }
.brand-mark {
  width: 42px;
  height: 42px;
  display: block;
  border-radius: 10px;
  box-shadow: 0 6px 18px rgba(67, 145, 255, 0.18);
  object-fit: cover;
}
.brand-name { color: #fff; font-size: 19px; line-height: 1; font-weight: 750; white-space: nowrap; }
.nav-links { display: flex; align-items: center; gap: 22px; color: var(--muted); font-size: 13px; }
.nav-links a { white-space: nowrap; }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: #fff; }
.nav-actions { display: flex; align-items: center; gap: 10px; }
.language-menu { position: relative; }
.lang-toggle, .ghost-button, .primary-button, .button-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  border-radius: 10px;
  color: var(--text);
  line-height: 1.2;
  text-align: center;
  transition: transform 260ms var(--ease-apple), box-shadow 260ms var(--ease-apple), border-color 260ms var(--ease-apple);
}
.lang-toggle, .ghost-button {
  padding: 0 14px;
  background: rgba(255,255,255,0.045);
  border: 1px solid rgba(143, 173, 255, 0.18);
  white-space: nowrap;
  font-size: 13px;
}
.nav-cta, .button-primary, .primary-button {
  padding: 0 18px;
  background: linear-gradient(135deg, #244b9a, #375fd6 52%, #6c63ff);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.18), 0 14px 34px rgba(55, 122, 255, 0.26);
  font-weight: 750;
  white-space: nowrap;
}
.lang-toggle:hover, .ghost-button:hover, .button-primary:hover, .primary-button:hover {
  transform: translateY(-2px) scale(1.025);
  box-shadow: 0 18px 42px rgba(61, 125, 255, 0.28);
  border-color: rgba(151, 178, 255, 0.38);
}
.lang-toggle:focus-visible, .ghost-button:focus-visible, .button-primary:focus-visible, .primary-button:focus-visible, .icon-button:focus-visible, .lang-option:focus-visible, .mobile-menu a:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 3px;
}
.lang-dropdown {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  width: 154px;
  display: grid;
  gap: 4px;
  padding: 8px;
  border: 1px solid rgba(143, 173, 255, 0.18);
  border-radius: 12px;
  background: rgba(7, 12, 26, 0.78);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.08), 0 24px 60px rgba(0,0,0,0.32);
  backdrop-filter: blur(18px) saturate(1.16);
  opacity: 0;
  transform: translateY(-6px) scale(0.98);
  pointer-events: none;
  transition: opacity 220ms var(--ease-apple), transform 240ms var(--ease-apple);
  z-index: 80;
}
.language-menu.open .lang-dropdown { opacity: 1; transform: translateY(0) scale(1); pointer-events: auto; }
.lang-option {
  min-height: 36px;
  padding: 0 10px;
  display: flex;
  align-items: center;
  border: 1px solid transparent;
  border-radius: 8px;
  color: rgba(224, 231, 248, 0.78);
  font-size: 13px;
  font-weight: 750;
}
.lang-option:hover { color: #fff; border-color: rgba(143, 173, 255, 0.2); background: rgba(255,255,255,0.065); }
.lang-option[aria-current="page"] {
  color: #fff;
  border-color: rgba(126, 165, 255, 0.42);
  background: linear-gradient(135deg, rgba(43, 168, 255, 0.22), rgba(121, 104, 242, 0.18));
}
.icon-button {
  display: none;
  width: 42px;
  min-height: 42px;
  border-radius: 10px;
  background: var(--glass-soft);
  border: 1px solid rgba(255, 255, 255, 0.14);
  color: var(--text);
}
.menu-icon { display: block; font-size: 21px; line-height: 1; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
.mobile-menu { display: none; border-top: 1px solid rgba(255,255,255,0.1); padding: 6px 0 14px; }
.mobile-menu a { display: block; padding: 11px 4px; color: var(--muted); }
.mobile-menu a:hover, .mobile-menu a[aria-current="page"] { color: #fff; }
.mobile-menu.open { display: block; }
.mobile-menu-actions { display: flex; gap: 10px; padding-top: 10px; }
.mobile-menu-actions .ghost-button, .mobile-menu-actions .primary-button { flex: 1 1 0; }
.breadcrumbs { padding-top: 42px; color: var(--muted); font-size: 14px; }
.breadcrumbs a:hover { color: #fff; }
.hero { padding: 64px 0 72px; text-align: center; }
.eyebrow {
  display: inline-flex;
  padding: 7px 13px;
  border: 1px solid rgba(151, 178, 255, 0.3);
  border-radius: 999px;
  color: #dce7ff;
  background: rgba(116, 146, 255, 0.1);
  font-size: 13px;
}
h1 { max-width: 940px; margin: 24px auto 20px; font-size: clamp(42px, 6vw, 72px); line-height: 1.08; letter-spacing: -0.035em; }
h2 { margin: 0 0 18px; font-size: clamp(29px, 4vw, 42px); line-height: 1.2; }
h3 { margin: 0 0 10px; font-size: 20px; }
.gradient { background: linear-gradient(135deg, #fff 5%, #9bc4ff 62%, #b9aaff); background-clip: text; color: transparent; }
.lead { max-width: 760px; margin: 0 auto 30px; color: #d5deef; font-size: 18px; }
.hero-media {
  margin-top: 48px;
  overflow: hidden;
  border: 1px solid rgba(116, 160, 255, 0.38);
  border-radius: 18px;
  background: #071021;
  box-shadow: 0 30px 90px rgba(0, 0, 0, 0.48);
  aspect-ratio: 16 / 9;
}
.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.section { padding: 72px 0; border-top: 1px solid rgba(143, 173, 255, 0.1); }
.section-head { max-width: 760px; margin-bottom: 34px; }
.section-head p, .copy p { color: var(--muted); }
.grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.card {
  min-height: 100%;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--panel);
}
.card p { margin: 0; color: var(--muted); }
.split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 42px; align-items: center; }
.copy ul { padding-left: 20px; color: #dbe4f4; }
.copy li + li { margin-top: 8px; }
.flow { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; counter-reset: step; }
.flow div { padding: 22px; border: 1px solid var(--line); border-radius: 14px; background: rgba(112, 146, 255, 0.07); }
.flow div::before { counter-increment: step; content: "0" counter(step); display: block; margin-bottom: 12px; color: var(--blue); font-weight: 800; }
.faq { display: grid; gap: 12px; }
.faq details { padding: 20px 22px; border: 1px solid var(--line); border-radius: 14px; background: rgba(9, 16, 35, 0.7); }
.faq summary { cursor: pointer; font-weight: 750; }
.faq p { margin: 12px 0 0; color: var(--muted); }
.cta { padding: 72px 0 84px; text-align: center; }
.cta-box { padding: 48px 24px; border: 1px solid rgba(126, 165, 255, 0.35); border-radius: 22px; background: linear-gradient(135deg, rgba(42, 93, 192, 0.26), rgba(108, 99, 255, 0.18)); }
.cta-box p { max-width: 650px; margin: 0 auto 24px; color: #d8e1f2; }
.site-footer { padding: 32px 0 48px; border-top: 1px solid rgba(143, 173, 255, 0.12); color: var(--muted); }
.footer-row { display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.footer-links { display: flex; gap: 18px; flex-wrap: wrap; }
.status { display: inline-flex; margin-top: 14px; padding: 6px 10px; border-radius: 999px; color: #c7d5f1; background: rgba(255,255,255,0.06); font-size: 13px; }

.tutorial-content { display: grid; gap: 48px; }
.tutorial-section h2 { padding-bottom: 14px; border-bottom: 1px solid var(--line); }
.tutorial-step { margin-top: 28px; }
.tutorial-step h3 { color: #dce7ff; }
.tutorial-step p { color: #dbe4f4; }
.tutorial-step p strong { color: #fff; }
.tutorial-step p code { padding: 2px 6px; border-radius: 6px; background: rgba(255,255,255,0.08); font-size: 0.92em; }
.tutorial-images { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 14px; margin-top: 14px; }
.tutorial-images img { border: 1px solid var(--line); border-radius: 12px; background: #071021; }
.tutorial-images img[data-zoom] { cursor: zoom-in; }
.tutorial-images img[data-zoom]:focus-visible { outline: 2px solid var(--blue); outline-offset: 3px; }

/* 图片放大查看：点击缩略图后全屏显示原图，点击空白处或按 Esc 关闭。 */
body.lightbox-open { overflow: hidden; }
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 120;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: clamp(16px, 4vw, 48px);
  background: rgba(2, 6, 18, 0.92);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  cursor: zoom-out;
}
.lightbox[hidden] { display: none; }
.lightbox img {
  width: auto;
  height: auto;
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #071021;
  box-shadow: 0 30px 90px rgba(0, 0, 0, 0.6);
  cursor: default;
}
.lightbox-close {
  position: absolute;
  top: clamp(12px, 3vw, 22px);
  right: clamp(12px, 3vw, 22px);
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(143, 173, 255, 0.24);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
  transition: background 220ms var(--ease-apple), border-color 220ms var(--ease-apple);
}
.lightbox-close:hover { background: rgba(255, 255, 255, 0.14); border-color: rgba(151, 178, 255, 0.38); }

@media (max-width: 980px) {
  .nav-links, .nav-actions .ghost-button, .nav-actions .primary-button { display: none; }
  .icon-button { display: grid; place-items: center; }
  .grid, .split { grid-template-columns: 1fr; }
  .flow { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .hero { padding-top: 48px; }
}

@media (max-width: 520px) {
  .shell { width: min(100% - 28px, 1120px); }
  .site-header { top: 8px; width: min(100% - 24px, 1220px); }
  .nav { min-height: 52px; padding: 0 10px; }
  .brand-mark { width: 36px; height: 36px; }
  .brand-name { font-size: 16px; }
  h1 { font-size: clamp(36px, 11vw, 50px); }
  .lead { font-size: 16px; }
  .flow { grid-template-columns: 1fr; }
  .hero-media { margin-top: 34px; border-radius: 12px; }
}