:root {
  color-scheme: light;
  --ink: #111820;
  --muted: #59666f;
  --cyan: #12aee5;
  --cyan-dark: #087c9e;
  --teal: #0c5962;
  --paper: #f7f5ed;
  --panel: #ffffff;
  --line: #dce7e9;
  --warm: #fff0ca;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 92% 4%, rgba(18, 174, 229, .11), transparent 22rem),
    linear-gradient(180deg, #fbfaf6 0%, var(--paper) 100%);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.72;
}

a { color: inherit; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(12, 89, 98, .12);
  background: rgba(255, 255, 255, .88);
  backdrop-filter: blur(14px);
}

.nav-inner {
  width: min(100% - 40px, 1180px);
  min-height: 68px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  display: inline-flex;
  gap: 10px;
  align-items: center;
  color: var(--ink);
  font-weight: 850;
  letter-spacing: -.02em;
  text-decoration: none;
}

.brand-mark {
  width: 27px;
  height: 27px;
  flex: 0 0 auto;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--teal), var(--cyan));
  box-shadow: inset 0 0 0 5px rgba(255, 255, 255, .2);
}

.nav-actions { display: flex; align-items: center; gap: 10px; }
.nav-actions a { text-decoration: none; font-size: .88rem; font-weight: 780; }
.nav-link { color: var(--muted); padding: 8px 5px; }
.language-switch { padding: 8px 13px; border: 1px solid #bcdfe7; border-radius: 10px; color: var(--teal); background: #fff; }
.nav-cta { padding: 9px 14px; border-radius: 10px; color: #fff; background: var(--cyan); }
.nav-actions a:hover { filter: brightness(.96); }

.hub-main,
.article-main {
  width: min(100% - 36px, 1180px);
  margin: 0 auto;
}

.hub-main { padding: 78px 0 100px; }
.article-main { max-width: 980px; padding: 74px 0 100px; }

.hub-eyebrow,
.article-main .eyebrow {
  margin: 0 0 18px;
  color: var(--cyan-dark);
  font-size: .82rem;
  font-weight: 850;
  letter-spacing: .18em;
  text-transform: uppercase;
}

.hub-main > h1 {
  max-width: 980px;
  margin: 0;
  font-size: clamp(3rem, 7vw, 6.1rem);
  line-height: .96;
  letter-spacing: -.06em;
}

.hub-intro {
  max-width: 800px;
  margin: 30px 0 34px;
  color: var(--muted);
  font-size: 1.1rem;
  line-height: 1.75;
}

.topic-strip { display: flex; flex-wrap: wrap; gap: 9px; margin: 0 0 54px; }
.topic-strip span { padding: 7px 11px; border: 1px solid #cae4e9; border-radius: 999px; color: var(--teal); background: rgba(255,255,255,.72); font-size: .78rem; font-weight: 760; }

.blog-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
.blog-card { overflow: hidden; border: 1px solid rgba(12,89,98,.07); border-radius: 27px; background: #fff; box-shadow: 0 22px 65px rgba(19,47,56,.11); }
.blog-card:last-child { grid-column: 1 / -1; display: grid; grid-template-columns: minmax(320px, 42%) 1fr; }
.card-image { display: block; aspect-ratio: 16 / 10; overflow: hidden; background: #edf3f4; }
.blog-card:last-child .card-image { aspect-ratio: auto; min-height: 100%; }
.card-image img { width: 100%; height: 100%; object-fit: cover; transition: transform .35s ease; }
.blog-card:hover .card-image img { transform: scale(1.015); }
.card-body { padding: 27px; }
.card-eyebrow { margin: 0 0 12px; color: var(--cyan-dark); font-size: .75rem; font-weight: 850; letter-spacing: .13em; text-transform: uppercase; }
.card-body h2 { margin: 0 0 14px; font-size: 1.65rem; line-height: 1.12; letter-spacing: -.035em; }
.card-body h2 a { text-decoration: none; }
.card-body > p:not(.card-eyebrow) { color: var(--muted); font-size: .96rem; line-height: 1.65; }
.read-link { display: inline-flex; gap: 8px; align-items: center; margin-top: 8px; color: var(--cyan-dark); font-weight: 800; text-decoration: none; }

.article-main h1 {
  max-width: 920px;
  margin: 0;
  font-size: clamp(2.75rem, 6vw, 5.4rem);
  line-height: .98;
  letter-spacing: -.055em;
}

.meta-description {
  margin: 30px 0 42px;
  padding: 20px 24px;
  border-left: 5px solid var(--cyan);
  border-radius: 0 18px 18px 0;
  color: #35424a;
  background: rgba(255,255,255,.82);
  box-shadow: 0 12px 36px rgba(12,89,98,.07);
}

.meta-description strong { color: var(--ink); }
.article-main h2 { margin: 78px 0 24px; font-size: clamp(2rem, 4vw, 3.1rem); line-height: 1.08; letter-spacing: -.04em; }
.article-main h3 { margin: 48px 0 16px; font-size: 1.55rem; line-height: 1.2; letter-spacing: -.025em; }
.article-main p,
.article-main li { font-size: 1.08rem; }
.article-main p { margin: 0 0 22px; }
.article-main img { max-width: 100%; height: auto; }
.article-main ul { padding-left: 1.35rem; }
.article-main li { margin: 9px 0; padding-left: .25rem; }

.article-main figure { margin: 38px 0 50px; }
.article-main figure img,
.article-main .hero img { display: block; width: 100%; height: auto; border-radius: 24px; background: #fff; box-shadow: 0 22px 60px rgba(19,47,56,.13); }
.article-main .hero { width: min(1180px, calc(100vw - 36px)); margin: 40px 50% 62px; transform: translateX(-50%); }
.article-main .hero-gif { width: min(952px, calc(100vw - 36px)); }
.article-main figcaption { max-width: 830px; margin: 14px auto 0; color: var(--muted); font-size: .91rem; line-height: 1.55; text-align: center; }
.article-main figcaption a { color: var(--cyan-dark); }
.image-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; margin: 38px 0 12px; }
.image-pair figure { margin: 0; }
.image-pair img { aspect-ratio: 3 / 4; object-fit: cover; }
.quality-pair img { aspect-ratio: 3 / 2; object-fit: cover; }
.proof-note { margin: 8px 0 50px !important; color: var(--muted); font-size: .91rem !important; text-align: center; }
.callout { margin: 52px 0; padding: 30px 34px; border-radius: 25px; background: linear-gradient(135deg, #0c5962, #087c9e); color: #fff; box-shadow: 0 22px 60px rgba(12,89,98,.22); }
.callout p:last-child { margin-bottom: 0; }
.cta { margin-top: 58px; padding: 40px; border-radius: 30px; background: #fff; box-shadow: 0 22px 65px rgba(19,47,56,.12); text-align: center; }
.cta h2 { margin: 0 0 16px; font-size: 2.35rem; }
.button { display: inline-block; margin-top: 10px; padding: 15px 25px; border-radius: 12px; color: #fff; background: linear-gradient(135deg, #0a9fd0, #16bde9); box-shadow: 0 12px 30px rgba(18,174,229,.3); font-weight: 800; text-decoration: none; }
.button:hover { filter: brightness(.96); transform: translateY(-1px); }
.source-tag { display: inline-block; margin-right: 8px; padding: 3px 8px; border-radius: 999px; color: var(--cyan-dark); background: #dcf5fa; font-size: .72rem; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }

footer { padding: 34px 20px 46px; color: #6b767d; font-size: .82rem; text-align: center; }

.choice-page { min-height: 100vh; display: grid; place-items: center; }
.choice-wrap { width: min(100% - 36px, 980px); padding: 70px 0; text-align: center; }
.choice-brand { justify-content: center; margin-bottom: 70px; }
.choice-wrap h1 { margin: 0; font-size: clamp(3.4rem, 8vw, 7rem); line-height: .92; letter-spacing: -.065em; }
.choice-zh { margin: 28px 0 38px; color: var(--muted); font-size: 1.22rem; }
.choice-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; max-width: 680px; margin: 0 auto; }
.choice-button { display: flex; flex-direction: column; gap: 2px; padding: 22px; border: 1px solid #cde2e6; border-radius: 18px; background: rgba(255,255,255,.82); color: var(--teal); text-decoration: none; box-shadow: 0 12px 36px rgba(12,89,98,.07); }
.choice-button.primary { border-color: var(--cyan); color: #fff; background: linear-gradient(135deg, var(--teal), var(--cyan-dark)); }
.choice-button strong { font-size: 1.25rem; }
.choice-button span { opacity: .78; font-size: .88rem; }
.choice-button:hover { transform: translateY(-2px); }
.choice-note { margin-top: 44px; color: #7a858b; font-size: .82rem; }

@media (max-width: 820px) {
  .blog-grid { grid-template-columns: 1fr; }
  .blog-card:last-child { grid-column: auto; display: block; }
  .blog-card:last-child .card-image { aspect-ratio: 16 / 10; }
}

@media (max-width: 700px) {
  .nav-inner { width: calc(100% - 28px); min-height: 62px; }
  .nav-link { display: none; }
  .nav-cta { display: none; }
  .hub-main { padding-top: 50px; }
  .article-main { width: min(100% - 28px, 980px); padding-top: 46px; }
  .article-main h1 { font-size: 2.75rem; }
  .article-main h2 { margin-top: 60px; }
  .meta-description { padding: 17px 18px; }
  .image-pair { grid-template-columns: 1fr; }
  .article-main .hero { width: calc(100vw - 20px); }
  .article-main figure img,
  .article-main .hero img { border-radius: 16px; }
  .cta { padding: 30px 20px; }
  .choice-brand { margin-bottom: 50px; }
  .choice-actions { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; transition: none !important; }
}