:root {
  color-scheme: light;
  --ink: #101010;
  --muted: #686868;
  --border: #e8e8e8;
  --blue: #0079bd;
  --pale: #e7f3fa;
  --shadow: 0 1px 3px #00000015;
  font-family: Arial, "Microsoft YaHei", "PingFang SC", sans-serif;
  color: var(--ink);
  background: #fff;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; font-size: 16px; line-height: 1.65; }
button, input { font: inherit; }
a { color: inherit; text-decoration: none; }
a, button { -webkit-tap-highlight-color: transparent; }
a:focus-visible, button:focus-visible, input:focus-visible, summary:focus-visible {
  outline: 2px solid var(--blue); outline-offset: 3px;
}
button, summary { cursor: pointer; }
[hidden] { display: none !important; }
h1, h2, h3, p { margin: 0; }
p { color: var(--muted); }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
.wide { width: min(calc(100% - 48px), 1240px); margin-inline: auto; }
.content { width: min(calc(100% - 48px), 896px); margin-inline: auto; }
.hero { padding: 91px 0 78px; text-align: center; border-bottom: 1px solid var(--border); }
.hero h1 { font-size: clamp(42px, 6vw, 72px); font-weight: 800; line-height: 1.13; letter-spacing: -.055em; }
.hero-intro { max-width: 545px; margin: 20px auto 0; font-size: 20px; line-height: 1.46; }
.download-form { display: flex; width: min(100%, 768px); gap: 12px; align-items: center; padding: 12px 9px 12px 30px; border: 1px solid #efefef; border-radius: 999px; margin-inline: auto; background: white; box-shadow: 0 7px 17px #0079bd0b; }
.hero .download-form { margin-top: 47px; }
.download-form:focus-within { border-color: #93cde9; }
.download-form input[type=url] { flex: 1; width: 0; min-width: 0; height: 44px; color: var(--ink); background: transparent; border: 0; padding: 0; outline: 0; }
.primary { display: inline-flex; align-items: center; justify-content: center; min-height: 45px; border: 0; border-radius: 999px; padding: 0 32px; background: var(--blue); color: white; white-space: nowrap; }
.primary:hover { background: #006aa7; }
.primary:disabled { opacity: .52; cursor: default; }
.rights { font-size: 12px; margin-top: 14px; }
.demo { display: flex; align-items: center; gap: 12px; text-align: left; max-width: 672px; padding: 16px; margin: 30px auto 0; border: 1px solid #d2e2eb; border-radius: 15px; font-size: 14px; line-height: 1.32; }
.demo:hover { background: #f7fbfd; border-color: #a4cee3; }
.demo .icon { width: 36px; height: 36px; border-radius: 11px; }
.demo strong { display: block; font-weight: 500; }
.demo small { color: var(--muted); font-size: 12px; overflow-wrap: anywhere; }
.demo > :last-child { margin-left: auto; color: var(--muted); }
.section { padding: 78px 0 0; }
.section > h2 { font-size: 25px; font-weight: 500; text-align: center; line-height: 1.35; }
.section-lead { text-align: center; font-size: 17px; margin-top: 15px; }
.intro-copy { margin: 34px 0 0; }
.intro-copy p + p { margin-top: 18px; }
.intro-copy h3 { font-size: 18px; margin-bottom: 8px; }
.grid { display: grid; gap: 24px; }
.two { grid-template-columns: repeat(2,minmax(0,1fr)); }
.three { grid-template-columns: repeat(3,minmax(0,1fr)); }
.steps { margin-top: 48px; }
.panel { background: #fff; border: 1px solid var(--border); border-radius: 21px; box-shadow: var(--shadow); }
.icon-card { display: flex; align-items: flex-start; gap: 16px; padding: 24px; }
.icon { display: inline-grid; place-items: center; width: 48px; height: 48px; flex: 0 0 auto; border-radius: 15px; color: var(--blue); background: var(--pale); font-size: 22px; font-weight: 700; line-height: 1; }
.icon-card h3 { font-size: 19px; line-height: 1.4; margin-bottom: 12px; }
.icon-card p { line-height: 1.7; }
.step-no { display: block; color: var(--blue); font-family: monospace; letter-spacing: .22em; font-size: 12px; margin-bottom: 12px; }
.inset { margin-top: 32px; padding: 24px; }
.inset h3 { font-size: 18px; margin-bottom: 8px; }
.inset > p { font-size: 14px; }
.limits { list-style: none; margin: 14px 0 0; padding: 0; gap: 12px; }
.limits li, .subcard { border: 1px solid #ececec; border-radius: 17px; padding: 15px; }
.limits li, .subcard p { font-size: 14px; color: var(--muted); }
.tutorials { gap: 15px; margin-top: 20px; }
.subcard { display: block; }
.subcard:hover { border-color: #adccdf; background: #fbfdff; }
.subcard strong { font-size: 14px; }
.subcard p { margin: 6px 0 12px; }
.subcard > span:last-child { font-size: 14px; color: var(--blue); }
.backtop { display: flex; width: max-content; min-height: 35px; margin: 32px auto 0; font-size: 14px; }
.features, .cases, .faq { margin-top: 46px; }
.cases { gap: 15px; }
.cases .icon-card { align-items: center; gap: 12px; padding: 17px; border-radius: 14px; }
.cases .icon { width: 36px; height: 36px; font-size: 17px; border-radius: 10px; }
.cases p { font-size: 14px; line-height: 1.5; }
.faq { padding: 12px 32px; }
.faq details + details { border-top: 1px dashed var(--border); }
.faq summary { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 12px 0; list-style: none; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: '⌄'; color: var(--muted); }
.faq details[open] summary::after { transform: rotate(180deg); }
.faq details p { padding: 0 0 16px; font-size: 15px; }
.footer { margin-top: 80px; border-top: 1px solid var(--border); }
.footer-main { display: grid; grid-template-columns: 2fr repeat(4,1fr); gap: 28px; padding-block: 58px; }
.footer-main h2 { font-size: 14px; margin: 4px 0 15px; }
.footer-main ul { padding: 0; margin: 0; list-style: none; }
.footer-main li + li { margin-top: 17px; }
.footer-main li a, .footer-bottom { color: var(--muted); font-size: 14px; }
.footer a:hover { color: var(--blue); }
.identity p { max-width: 275px; margin-top: 7px; }
.brand { font-size: 21px; font-weight: 750; }
.brand span { display: inline-grid; place-items: center; width: 28px; height: 28px; margin-right: 5px; border-radius: 6px; color: white; background: var(--blue); }
.footer-bottom { border-top: 1px solid var(--border); padding: 25px 0; }
.result-page { width: min(calc(100% - 48px),736px); margin: 32px auto 0; min-height: 410px; }
.result-back { display: inline-block; margin: 62px 0 28px 16px; color: var(--muted); font-size: 14px; }
.result-back:hover { color: var(--blue); }
#status:empty { display: none; }
#status { padding: 16px 20px; border-radius: 14px; margin-bottom: 18px; background: var(--pale); }
#status.error { color: #a72121; background: #fef0ef; }
.post { display: flex; align-items: flex-start; gap: 16px; padding: 31px; border-radius: 18px; }
.x-mark { display: grid; flex: 0 0 auto; place-items: center; width: 48px; height: 48px; background: var(--blue); color: #fff; border-radius: 50%; font-size: 25px; }
.post h2 { font-size: 30px; line-height: 1.25; }
#post-text { margin: 8px 0 0; overflow-wrap: anywhere; }
.source-link { display: inline-flex; align-items: center; margin-top: 12px; padding: 6px 15px; color: var(--blue); border-radius: 999px; background: var(--pale); font-size: 14px; }
.save-instructions { padding: 30px 4px 23px; font-size: 14px; }
.save-instructions h2 { font-size: 15px; margin-bottom: 7px; }
.save-instructions p + p { margin-top: 7px; }
.media-card { border-radius: 18px; overflow: hidden; }
.media-card + .media-card { margin-top: 16px; }
.media-card header { display: flex; align-items: center; gap: 12px; border-bottom: 1px solid var(--border); padding: 15px 24px; background: linear-gradient(90deg,#eff7fb,#fff); }
.media-card header h2 { font-size: 18px; }
.media-card header .icon { width: 40px; height: 40px; border-radius: 50%; }
.media-body { display: grid; grid-template-columns: minmax(0,1.6fr) minmax(150px,1fr); padding: 24px; gap: 24px; }
.choice-label { display: block; font-size: 14px; margin-bottom: 11px; font-weight: 650; }
.choices { display: grid; grid-template-columns: repeat(auto-fit,minmax(96px,1fr)); gap: 9px; }
.quality { padding: 12px 5px; border-radius: 13px; border: 1px solid #dedede; background: #fff; color: var(--ink); box-shadow: var(--shadow); }
.quality strong { display: block; line-height: 1.25; }
.quality small { color: var(--muted); font-size: 11px; }
.quality[aria-pressed=true] { color: white; background: var(--blue); border-color: var(--blue); }
.quality[aria-pressed=true] small { color: #e8f6ff; }
.media-actions { display: grid; gap: 11px; align-content: center; }
.media-actions .primary, .media-actions button { width: 100%; min-height: 46px; border-radius: 13px; font-weight: 600; font-size: 14px; }
.media-actions button { background: white; border: 1px solid #dedede; color: var(--ink); box-shadow: var(--shadow); }
.media-actions button:hover { background: #f7fafc; }
.breadcrumb { padding: 89px 0 29px; display: flex; flex-wrap: wrap; align-items: center; gap: 10px; color: var(--muted); font-size: 14px; }
.breadcrumb [aria-current] { color: var(--ink); }
.breadcrumb a:hover, .article a:hover { color: var(--blue); }
.article { min-height: 420px; }
.article header { padding-bottom: 24px; border-bottom: 1px solid var(--border); }
.article h1, .blog h1 { font-size: clamp(27px,3vw,34px); line-height: 1.28; letter-spacing: -.025em; margin: 10px 0 14px; }
.article header > p, .blog > p { font-size: 18px; }
.article section { margin-top: 39px; }
.article section h2 { font-size: 23px; font-weight: 500; margin-bottom: 15px; }
.article section p { line-height: 1.9; }
.article-links { display: flex; flex-wrap: wrap; gap: 18px; padding-top: 35px; color: var(--blue); }
.tag { display: inline-flex; padding: 3px 10px; color: var(--muted); background: #f4f4f4; border-radius: 99px; font-size: 13px; }
.tag[aria-current] { background: var(--pale); color: var(--blue); }
.blog { text-align: center; padding-top: 62px; }
.category-list { display: flex; justify-content: center; flex-wrap: wrap; gap: 9px; margin: 28px 0 10px; }
.all-categories { color: var(--muted); font-size: 14px; }
.all-categories:hover { color: var(--blue); }
.blog-list { text-align: left; margin: 30px 0 0; }
.blog-list .subcard { padding: 22px; }
.blog-list h2 { font-size: 20px; margin-top: 7px; }
.blog-card { border-radius: 16px; overflow: hidden; }
.blog-card:hover { border-color: #7db9db; }
.blog-cover {
  aspect-ratio: 16/9; padding: clamp(13px,2vw,25px); color: #fff; display: flex;
  flex-direction: column; justify-content: space-between;
  background: radial-gradient(circle at 86% 105%,#41d7fb,transparent 54%), linear-gradient(135deg,#08279a,#096ace 67%,#13bfe8);
}
.blog-card:nth-child(3n+2) .blog-cover { background: radial-gradient(circle at 83% 104%,#39dbe7,transparent 57%),linear-gradient(135deg,#111476,#124fc5 60%,#009ddd); }
.blog-card:nth-child(3n+3) .blog-cover { background: radial-gradient(circle at 90% 106%,#2edcf1,transparent 52%),linear-gradient(140deg,#132b96,#1d6fda); }
.blog-cover b { font-size: clamp(19px,2vw,32px); line-height: 1.18; text-shadow: 0 2px 4px #03164e; }
.blog-cover span { align-self: flex-end; font-weight: 800; line-height: 1; padding: 11px; border: 1px solid #fff7; border-radius: 13px; background: #ffffff28; }
.blog-card-body { padding: 17px; }
.blog-card-body h2 { font-size: 18px; font-weight: 500; }
.blog-card-body p { font-size: 14px; margin-top: 6px; }
.tool-page .breadcrumb { padding-top: 38px; padding-bottom: 0; }
.tool-page .hero { padding-top: 49px; }
.tool-page .hero h1 { font-size: clamp(38px,5vw,62px); }
.comparison { margin-top: 36px; overflow: auto; }
.comparison table { width: 100%; border-collapse: collapse; font-size: 15px; text-align: left; }
.comparison th, .comparison td { padding: 14px; border-bottom: 1px solid var(--border); }
.comparison thead { background: #f5f9fc; }
.comparison tbody td { color: var(--muted); }
.comparison tr:last-child th, .comparison tbody tr:last-child td { border-bottom: 0; }
@media (max-width: 720px) {
  .wide, .content, .result-page { width: calc(100% - 32px); }
  .hero { padding: 58px 0 52px; }
  .hero-intro { font-size: 16px; max-width: 520px; }
  .hero .download-form { margin-top: 30px; }
  .download-form { padding: 7px 7px 7px 14px; gap: 6px; }
  .download-form .primary { padding-inline: 16px; }
  .section { padding-top: 52px; }
  .grid { gap: 13px; }
  .three, .two { grid-template-columns: 1fr; }
  .icon-card, .inset { padding: 17px; }
  .steps, .features, .cases, .faq { margin-top: 26px; }
  .faq { padding: 10px 18px; }
  .footer { margin-top: 56px; }
  .footer-main { grid-template-columns: repeat(2,1fr); padding-block: 36px; }
  .identity { grid-column: 1/-1; }
  .result-back { margin-top: 35px; }
  .post { padding: 20px; }
  .post h2 { font-size: 24px; }
  .media-body { grid-template-columns: 1fr; padding: 17px; gap: 14px; }
  .media-card header { padding-inline: 17px; }
  .breadcrumb { padding-top: 44px; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }