/* V7.3.12 — Luminous topic articles */
.topic-reading{position:relative;overflow:hidden;background:linear-gradient(150deg,#fff,var(--topic-soft));}
.topic-reading:before{content:"";position:absolute;width:320px;height:320px;right:-150px;top:-180px;border-radius:50%;background:radial-gradient(circle,color-mix(in srgb,var(--topic-accent) 18%,transparent),transparent 70%);pointer-events:none}
.topic-reading-head{position:relative;z-index:1}.topic-reading-head>strong{padding:7px 11px;border-radius:999px;background:var(--topic-soft);color:var(--topic-accent);font-size:10px}
.topic-article-grid{position:relative;z-index:1;display:grid;grid-template-columns:1.35fr .825fr .825fr;gap:13px;margin-top:19px}
.topic-article-card{position:relative;overflow:hidden;min-width:0;min-height:265px;padding:18px;border:1px solid rgba(211,224,240,.95);border-radius:23px;background:rgba(255,255,255,.88);text-decoration:none;box-shadow:0 12px 28px rgba(27,67,125,.07);display:flex;flex-direction:column;transition:.24s ease}
.topic-article-card:hover{transform:translateY(-5px);border-color:color-mix(in srgb,var(--topic-accent) 42%,#dce6f3);box-shadow:0 20px 42px color-mix(in srgb,var(--topic-accent) 14%,transparent)}
.topic-article-glow{position:absolute;inset:auto -30% -55% auto;width:210px;height:210px;border-radius:50%;background:radial-gradient(circle,color-mix(in srgb,var(--topic-accent-2) 28%,transparent),transparent 68%);transition:.3s}.topic-article-card:hover .topic-article-glow{transform:scale(1.16)}
.topic-article-visual{position:relative;height:78px;display:flex;align-items:center;justify-content:space-between}.topic-article-visual i{width:52px;height:52px;border-radius:17px;display:grid;place-items:center;background:linear-gradient(135deg,var(--topic-accent),var(--topic-accent-2));font-size:25px;font-style:normal;box-shadow:0 12px 25px color-mix(in srgb,var(--topic-accent) 26%,transparent)}.topic-article-visual b{font-family:"Noto Serif SC","Microsoft YaHei",serif;font-size:51px;color:color-mix(in srgb,var(--topic-accent) 18%,transparent);line-height:1}
.topic-article-copy{position:relative;z-index:1;display:flex;flex:1;flex-direction:column}.topic-article-meta{display:flex;justify-content:space-between;gap:8px;align-items:center}.topic-article-meta em{color:var(--topic-accent);font-size:9px;font-weight:900;letter-spacing:.07em;font-style:normal}.topic-article-meta small{color:#7c8ca2;font-size:9px}.topic-article-card h3{margin:10px 0 7px;font-size:19px;line-height:1.25}.topic-article-card p{margin:0;color:#697a91;font-size:11px;line-height:1.55;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}.topic-article-card .topic-article-copy>strong{margin-top:auto;padding-top:14px;color:var(--topic-accent);font-size:11px}.topic-article-card .topic-article-copy>strong span{display:inline-block;transition:.2s}.topic-article-card:hover .topic-article-copy>strong span{transform:translateX(4px)}
.topic-article-card.is-featured{background:linear-gradient(145deg,#fff,var(--topic-soft));}.topic-article-card.is-featured h3{font-size:23px}.topic-article-card.is-featured .topic-article-visual{height:91px}.topic-article-card.is-featured .topic-article-visual b{font-size:65px}
.topic-article-page{background:#f5f8fd;color:#102b52}.article-main{padding-bottom:10px}.article-hero{position:relative;overflow:hidden;width:min(1360px,92%);margin:24px auto 0;padding:42px 48px;border:1px solid color-mix(in srgb,var(--topic-accent) 20%,#dce6f2);border-radius:32px;background:linear-gradient(135deg,#fff,var(--topic-soft));box-shadow:0 18px 48px rgba(24,61,113,.09)}
.article-hero-orb{position:absolute;border-radius:50%;filter:blur(2px);pointer-events:none}.article-hero-orb.one{width:430px;height:430px;right:-100px;top:-230px;background:radial-gradient(circle,color-mix(in srgb,var(--topic-accent-2) 35%,transparent),transparent 68%)}.article-hero-orb.two{width:330px;height:330px;left:-180px;bottom:-210px;background:radial-gradient(circle,color-mix(in srgb,var(--topic-accent) 17%,transparent),transparent 70%)}.article-hero-stars{position:absolute;inset:0;opacity:.55;background-image:radial-gradient(circle at 18% 30%,#fff 0 2px,transparent 3px),radial-gradient(circle at 76% 22%,#fff 0 1.5px,transparent 2.5px),radial-gradient(circle at 63% 78%,#fff 0 1px,transparent 2px);background-size:180px 160px;animation:articleStars 16s linear infinite}
.article-breadcrumb{position:relative;z-index:1;display:flex;gap:8px;align-items:center;color:#71839a;font-size:10px}.article-breadcrumb a{color:inherit;text-decoration:none}.article-breadcrumb b{color:var(--topic-accent)}.article-hero-grid{position:relative;z-index:1;display:grid;grid-template-columns:1.35fr .65fr;gap:35px;align-items:center;margin-top:30px}.article-kicker{display:inline-flex;padding:6px 11px;border-radius:999px;background:#fff;color:var(--topic-accent);font-size:9px;font-weight:900;letter-spacing:.09em;box-shadow:0 8px 18px rgba(30,70,125,.07)}.article-hero h1{max-width:860px;margin:13px 0 13px;font-size:45px;line-height:1.08;letter-spacing:-.035em}.article-hero-copy>p{max-width:780px;margin:0;color:#60738d;font-size:15px;line-height:1.65}.article-meta{display:flex;gap:8px;flex-wrap:wrap;margin-top:18px}.article-meta span{padding:7px 10px;border-radius:999px;background:rgba(255,255,255,.78);color:#46627f;font-size:10px;font-weight:750}.article-hero-art{position:relative;min-height:235px;display:grid;place-items:center}.article-hero-art>b{position:relative;z-index:2;font-family:"Noto Serif SC","Microsoft YaHei",serif;font-size:96px;color:#fff;text-shadow:0 15px 35px color-mix(in srgb,var(--topic-accent) 45%,transparent)}.article-hero-art:before{content:"";position:absolute;width:210px;height:210px;border-radius:55px;background:linear-gradient(135deg,var(--topic-accent),var(--topic-accent-2));transform:rotate(-7deg);box-shadow:0 30px 55px color-mix(in srgb,var(--topic-accent) 28%,transparent)}.article-hero-art .article-icon{position:absolute;z-index:3;right:8%;top:4%;width:58px;height:58px;border-radius:19px;display:grid;place-items:center;background:#fff;font-size:28px;box-shadow:0 14px 28px rgba(34,74,128,.14);animation:articleFloat 4s ease-in-out infinite}.article-hero-art>i{position:absolute;left:9%;bottom:3%;font-style:normal;font-family:"Noto Serif SC","Microsoft YaHei",serif;font-size:72px;color:color-mix(in srgb,var(--topic-accent) 18%,transparent);transform:rotate(-8deg)}
.article-layout{width:min(1180px,90%);margin:24px auto 0;display:grid;grid-template-columns:minmax(0,1fr) 330px;gap:22px;align-items:start}.article-content{min-width:0}.article-lead{margin:0;padding:25px 28px;border-left:5px solid var(--topic-accent);border-radius:0 20px 20px 0;background:#fff;color:#344e6d;font-size:17px;line-height:1.75;box-shadow:0 12px 28px rgba(27,67,125,.06)}.article-section-card{margin-top:14px;padding:23px 25px;display:grid;grid-template-columns:auto 1fr;gap:18px;background:#fff;border:1px solid #e1e9f4;border-radius:22px;box-shadow:0 10px 25px rgba(27,67,125,.05)}.article-section-card>span{width:42px;height:42px;border-radius:14px;display:grid;place-items:center;background:var(--topic-soft);color:var(--topic-accent);font-weight:900}.article-section-card h2{margin:1px 0 9px;font-size:21px}.article-section-card p{margin:0;color:#63758d;font-size:14px;line-height:1.75}.article-examples{margin-top:14px;padding:25px;background:linear-gradient(145deg,#fff,var(--topic-soft));border:1px solid #dfe8f4;border-radius:24px}.article-examples header span,.article-vocab-box>span,.article-related header span{color:var(--topic-accent);font-size:9px;font-weight:900;letter-spacing:.09em}.article-examples header h2,.article-vocab-box h2,.article-related h2{margin:5px 0 15px;font-size:23px}.article-example{padding:15px 0;display:grid;grid-template-columns:auto 1fr;gap:13px;border-top:1px solid rgba(205,219,236,.85)}.article-example button{width:40px;height:40px;border:0;border-radius:13px;background:#fff;color:var(--topic-accent);cursor:pointer;box-shadow:0 8px 18px rgba(24,65,122,.08)}.article-example b,.article-example em{display:block}.article-example b{font-size:17px}.article-example em{margin-top:4px;color:#2864a7;font-size:12px;font-style:normal}.article-example p{margin:4px 0 0;color:#6b7b91;font-size:12px}.article-tip{margin-top:14px;padding:20px 23px;display:grid;grid-template-columns:auto 1fr;gap:13px;border-radius:21px;background:linear-gradient(135deg,#102a50,#17477c);color:#fff}.article-tip i{font-size:29px;font-style:normal}.article-tip b{display:block}.article-tip p{margin:6px 0 0;color:#cfdef0;font-size:13px;line-height:1.65}
.article-sidebar{position:sticky;top:92px;display:grid;gap:14px}.article-vocab-box{padding:20px;background:#fff;border:1px solid #e1e9f4;border-radius:24px;box-shadow:0 12px 28px rgba(27,67,125,.06)}.article-vocab-list{display:grid;gap:8px}.article-vocab-list a{position:relative;padding:12px 34px 12px 13px;display:grid;grid-template-columns:auto 1fr;column-gap:10px;border-radius:15px;background:linear-gradient(145deg,#f8fbff,var(--topic-soft));text-decoration:none}.article-vocab-list b{grid-row:1/3;font-family:"Noto Serif SC","Microsoft YaHei",serif;font-size:24px;align-self:center}.article-vocab-list em{color:var(--topic-accent);font-size:10px;font-style:normal}.article-vocab-list small{color:#6d7d91;font-size:10px}.article-vocab-list strong{position:absolute;right:12px;top:50%;transform:translateY(-50%);color:var(--topic-accent)}.article-topic-cta{position:relative;overflow:hidden;padding:20px;border-radius:23px;background:linear-gradient(135deg,var(--topic-accent),var(--topic-accent-2));color:#fff;text-decoration:none;box-shadow:0 16px 34px color-mix(in srgb,var(--topic-accent) 23%,transparent)}.article-topic-cta:after{content:"";position:absolute;width:130px;height:130px;right:-50px;bottom:-70px;border-radius:50%;background:rgba(255,255,255,.18)}.article-topic-cta span,.article-topic-cta b,.article-topic-cta strong{position:relative;z-index:1;display:block}.article-topic-cta span{font-size:8px;font-weight:900;letter-spacing:.09em}.article-topic-cta b{margin-top:8px;font-size:18px;line-height:1.35}.article-topic-cta strong{margin-top:16px;font-size:11px}
.article-related{width:min(1180px,90%);margin:24px auto 0;padding:25px;background:#fff;border:1px solid #e1e9f4;border-radius:26px;box-shadow:0 12px 28px rgba(27,67,125,.06)}.article-related-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.article-related-grid a{padding:15px;display:grid;grid-template-columns:auto 1fr;gap:13px;border:1px solid #e3ebf5;border-radius:18px;background:linear-gradient(145deg,#fff,var(--topic-soft));text-decoration:none}.article-related-grid i{width:48px;height:48px;border-radius:15px;display:grid;place-items:center;background:linear-gradient(135deg,var(--topic-accent),var(--topic-accent-2));font-size:22px;font-style:normal}.article-related-grid small,.article-related-grid b,.article-related-grid em{display:block}.article-related-grid small{color:#7b8ba0;font-size:9px}.article-related-grid b{margin-top:4px;font-size:14px;line-height:1.35}.article-related-grid em{margin-top:8px;color:var(--topic-accent);font-size:10px;font-style:normal;font-weight:850}
@keyframes articleFloat{50%{transform:translateY(-8px) rotate(4deg)}}@keyframes articleStars{to{background-position:180px 160px}}
@media(max-width:1000px){.topic-article-grid{grid-template-columns:1fr 1fr}.topic-article-card.is-featured{grid-column:1/-1}.article-hero h1{font-size:39px}.article-layout{grid-template-columns:1fr}.article-sidebar{position:static;grid-template-columns:1fr 1fr}.article-vocab-box{grid-row:1/3}}
@media(max-width:720px){.topic-reading{padding-left:0;padding-right:0;overflow:hidden}.topic-reading>.topic-section-head{padding:0 14px}.topic-reading-head>strong{display:none}.topic-article-grid{display:flex;gap:10px;overflow-x:auto;scroll-snap-type:x mandatory;padding:0 14px 5px;scrollbar-width:none}.topic-article-grid::-webkit-scrollbar{display:none}.topic-article-card,.topic-article-card.is-featured{flex:0 0 82%;min-height:226px;scroll-snap-align:start;padding:15px;border-radius:20px}.topic-article-card.is-featured h3,.topic-article-card h3{font-size:18px}.topic-article-card.is-featured .topic-article-visual,.topic-article-visual{height:66px}.topic-article-card.is-featured .topic-article-visual b,.topic-article-visual b{font-size:46px}.topic-article-card p{-webkit-line-clamp:2}.article-hero{width:calc(100% - 20px);margin-top:12px;padding:22px 18px;border-radius:24px}.article-breadcrumb{overflow:auto;white-space:nowrap}.article-hero-grid{grid-template-columns:1fr;margin-top:20px}.article-hero h1{font-size:31px}.article-hero-copy>p{font-size:13px}.article-hero-art{min-height:170px}.article-hero-art:before{width:150px;height:150px;border-radius:40px}.article-hero-art>b{font-size:68px}.article-hero-art .article-icon{width:47px;height:47px;font-size:23px;right:15%}.article-hero-art>i{font-size:55px;left:13%}.article-layout,.article-related{width:calc(100% - 20px);margin-top:14px}.article-lead{padding:18px 19px;font-size:14px}.article-section-card{padding:17px 15px;gap:12px}.article-section-card>span{width:36px;height:36px}.article-section-card h2{font-size:18px}.article-section-card p{font-size:12px}.article-examples{padding:18px 15px}.article-examples header h2,.article-vocab-box h2,.article-related h2{font-size:20px}.article-example b{font-size:15px}.article-sidebar{grid-template-columns:1fr}.article-vocab-box{grid-row:auto}.article-related{padding:18px 14px}.article-related-grid{grid-template-columns:1fr}.article-meta span{font-size:9px}.article-topic-cta b{font-size:16px}}
@media(prefers-reduced-motion:reduce){.article-hero-stars,.article-hero-art .article-icon{animation:none!important}}

/* V7.3.13 — article mobile refinement */
@media(max-width:720px){
.article-page,.article-layout,.article-main,.article-sidebar,.article-section-card,.article-examples,.article-related{min-width:0}
.article-hero,.article-layout,.article-related{max-width:100%;overflow:hidden}
.article-hero h1,.article-section-card h2,.article-example b,.article-topic-cta b{overflow-wrap:anywhere}
.article-example{grid-template-columns:minmax(0,1fr) auto}
.article-example button,.topic-speak{min-width:42px;min-height:42px}
.article-vocab-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
.article-vocab-grid>*{min-width:0}
.article-related-card{min-width:0}
}
@media(max-width:390px){
.article-hero{width:calc(100% - 14px);padding:18px 13px;border-radius:20px}
.article-hero h1{font-size:27px;line-height:1.12}
.article-hero-grid{margin-top:14px}
.article-hero-art{min-height:130px}
.article-hero-art:before{width:116px;height:116px;border-radius:30px}
.article-hero-art>b{font-size:55px}
.article-layout,.article-related{width:calc(100% - 14px)}
.article-lead{padding:15px;font-size:13px}
.article-section-card{padding:14px 11px}
.article-section-card>span{width:32px;height:32px}
.article-section-card h2{font-size:17px}
.article-examples{padding:15px 11px}
.article-vocab-grid{gap:7px}
.article-vocab-item{padding:10px 7px}
.topic-article-card,.topic-article-card.is-featured{flex-basis:86%;min-height:212px}
}


/* V7.3.14 — richer article library with compact reveal */
.topic-article-card.is-extra{display:none}
.topic-article-grid.is-expanded .topic-article-card.is-extra{display:flex}
.topic-articles-more{margin:17px auto 0;min-width:190px;height:45px;padding:0 17px;border:1px solid color-mix(in srgb,var(--topic-accent) 28%,#dce7f3);border-radius:999px;background:rgba(255,255,255,.86);color:var(--topic-accent);display:flex;align-items:center;justify-content:center;gap:10px;font-weight:850;font-size:12px;cursor:pointer;box-shadow:0 9px 22px rgba(27,67,125,.07);transition:.2s}
.topic-articles-more:hover{transform:translateY(-2px);box-shadow:0 14px 28px color-mix(in srgb,var(--topic-accent) 13%,transparent)}
.topic-articles-more i{width:24px;height:24px;border-radius:50%;display:grid;place-items:center;background:var(--topic-soft);font-style:normal;font-size:17px}
@media(max-width:720px){.topic-article-grid.is-expanded{padding-bottom:8px}.topic-articles-more{height:42px;margin-top:13px}.topic-article-grid.is-expanded .topic-article-card.is-extra{display:flex}}