:root{
  --ink:#1c222e; --bg:#fbf8f1; --paper:#f1ead9; --cream:#f6f0e2; --line:#e6ddc9;
  --gold:#e3a52b; --coral:#df6238; --green:#5f8e63; --blue:#3f6fa5; --navy:#101d36; --charcoal:#20242c;
  --muted:#6c6a62; --white:#fff;
  --serif:"Noto Serif SC",serif; --sans:"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --hand:"Ma Shan Zheng",cursive;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--sans);color:var(--ink);background:var(--bg);line-height:1.8;font-size:16px;-webkit-font-smoothing:antialiased;overflow-x:hidden}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
.hand{font-family:var(--hand)}
.wrap{max-width:1000px;margin:0 auto;padding:0 24px}
.btn{display:inline-flex;align-items:center;gap:8px;font-weight:500;font-size:15px;padding:12px 24px;border-radius:40px;transition:.2s;cursor:pointer;border:1.5px solid transparent}
.btn-gold{background:var(--gold);color:#3a2a06}.btn-gold:hover{filter:brightness(.95);transform:translateY(-2px)}
.btn-ghost{border-color:#fff;color:#fff;background:transparent}.btn-ghost:hover{background:rgba(255,255,255,.14)}
.eyebrow{font-family:var(--hand);font-size:22px;color:var(--coral);display:block;margin-bottom:6px}
.h2{font-family:var(--serif);font-weight:900;font-size:clamp(25px,4vw,38px);line-height:1.25}
.lead{color:var(--muted);font-size:16px;max-width:680px;margin-top:8px}

/* topbar */
.topbar{position:sticky;top:0;z-index:50;background:rgba(251,248,241,.94);backdrop-filter:blur(8px);border-bottom:1.5px solid var(--ink)}
.topbar .row{display:flex;align-items:center;justify-content:space-between;height:60px}
.topbar .back{display:inline-flex;align-items:center;gap:8px;font-size:14px;color:var(--muted)}
.topbar .back:hover{color:var(--ink)}
.topbar .wordmark{font-family:var(--serif);font-weight:900;font-size:20px;letter-spacing:.05em}
.topbar .wordmark .s{color:var(--gold)}
.topbar .cta{background:var(--gold);color:#3a2a06;font-weight:700;font-size:13px;padding:8px 16px;border-radius:30px}

/* banner */
.banner{position:relative;background:var(--navy);color:#fff;overflow:hidden}
.banner-bg{position:absolute;inset:0}
.banner-bg img{width:100%;height:100%;object-fit:cover;opacity:.42}
.banner-ov{position:absolute;inset:0;background:linear-gradient(180deg,rgba(16,29,54,.55),rgba(16,29,54,.85))}
.banner .stars{position:absolute;inset:0;pointer-events:none;background-image:
  radial-gradient(1.4px 1.4px at 30px 40px,#fff,transparent),
  radial-gradient(1.4px 1.4px at 130px 90px,rgba(255,255,255,.8),transparent),
  radial-gradient(2px 2px at 300px 60px,rgba(227,165,43,.95),transparent),
  radial-gradient(1px 1px at 360px 150px,#fff,transparent);
  background-size:380px 220px;opacity:.85}
.banner .inner{position:relative;z-index:2;padding:48px 24px 42px}
.banner h1{font-family:var(--serif);font-weight:900;font-size:clamp(30px,5.4vw,52px);line-height:1.15}
.banner h1 .m{color:var(--gold)}
.banner p{margin-top:14px;color:#cfd6e6;font-size:16px;max-width:600px}
.banner .tags{margin-top:18px;display:flex;flex-wrap:wrap;gap:8px}
.banner .tags span{background:rgba(255,255,255,.13);border:1px solid rgba(255,255,255,.3);border-radius:30px;padding:6px 14px;font-size:13px}

/* sections */
section.sec{padding:38px 0}
section.sec.alt{background:var(--cream)}
.sec-head{max-width:680px;margin-bottom:20px}

/* params */
.params{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
.param{background:var(--white);border-radius:14px;padding:18px;text-align:center;box-shadow:0 8px 18px rgba(20,20,20,.05)}
.param b{display:block;font-family:var(--serif);font-size:20px;font-weight:700;color:var(--navy)}
.param span{font-size:13px;color:var(--muted)}

/* feature cards */
.fcards{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
.fcard{background:var(--white);border-radius:16px;padding:16px 16px;box-shadow:0 10px 22px rgba(20,20,20,.06);border-top:4px solid var(--gold)}
.fcard:nth-child(2){border-color:var(--coral)}.fcard:nth-child(3){border-color:var(--green)}.fcard:nth-child(4){border-color:var(--blue)}
.fcard .n{font-family:var(--serif);font-weight:900;font-size:22px;color:var(--gold)}
.fcard:nth-child(2) .n{color:var(--coral)}.fcard:nth-child(3) .n{color:var(--green)}.fcard:nth-child(4) .n{color:var(--blue)}
.fcard h4{font-family:var(--serif);font-size:18px;font-weight:700;margin:4px 0 6px}
.fcard p{font-size:14px;color:var(--muted)}

/* stage list */
.stages{display:grid;grid-template-columns:1fr;gap:12px}
.stagerow{background:var(--white);border-radius:14px;overflow:hidden;box-shadow:0 8px 18px rgba(20,20,20,.05);display:grid;grid-template-columns:96px 1fr}
.stagerow .lv{background:var(--navy);color:#fff;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:14px 8px;text-align:center}
.stagerow .lv b{font-family:var(--serif);font-size:24px;font-weight:900;color:var(--gold)}
.stagerow .lv span{font-size:12px;opacity:.85}
.stagerow .sc{padding:16px 18px}
.stagerow .sc h4{font-family:var(--serif);font-size:17px;font-weight:700}
.stagerow .sc .who{font-size:12.5px;color:var(--coral);margin:2px 0 6px}
.stagerow .sc p{font-size:13.5px;color:var(--muted)}

/* detail item (course/activity) */
.ditems{display:grid;grid-template-columns:1fr;gap:22px}
.ditem{background:var(--white);border-radius:18px;overflow:hidden;box-shadow:0 12px 26px rgba(20,20,20,.07);display:grid;grid-template-columns:1fr}
.ditem .di-img{aspect-ratio:16/10;overflow:hidden}
.ditem .di-img img{width:100%;height:100%;object-fit:cover;transition:.5s}
.ditem:hover .di-img img{transform:scale(1.05)}
.ditem .di-b{padding:22px 24px}
.ditem .tag2{font-family:var(--hand);font-size:18px;color:var(--coral)}
.ditem h3{font-family:var(--serif);font-size:22px;font-weight:700;margin:2px 0 8px}
.ditem p{font-size:14.5px;color:#55534d}
.ditem ul{list-style:none;margin-top:10px}
.ditem ul li{position:relative;padding:3px 0 3px 20px;font-size:13.5px;color:var(--muted)}
.ditem ul li::before{content:"★";position:absolute;left:0;top:3px;color:var(--gold);font-size:11px}

/* activity grid */
.agrid{display:grid;grid-template-columns:1fr;gap:18px}
.acard{background:var(--white);border-radius:16px;overflow:hidden;box-shadow:0 10px 22px rgba(20,20,20,.06);transition:transform .25s}
.acard:hover{transform:translateY(-5px)}
.acard .ac-img{aspect-ratio:4/3;overflow:hidden}
.acard .ac-img img{width:100%;height:100%;object-fit:cover;transition:.5s}
.acard:hover .ac-img img{transform:scale(1.06)}
.acard .ac-b{padding:16px 18px 20px}
.acard h4{font-family:var(--serif);font-size:18px;font-weight:700;margin-bottom:5px}
.acard p{font-size:13.5px;color:var(--muted)}

/* cta */
.cta{background:var(--navy);color:#fff;text-align:center;padding:58px 24px;position:relative;overflow:hidden}
.cta .stars{position:absolute;inset:0;pointer-events:none;background-image:radial-gradient(1.4px 1.4px at 40px 40px,#fff,transparent),radial-gradient(2px 2px at 300px 80px,rgba(227,165,43,.9),transparent);background-size:360px 200px;opacity:.7}
.cta .inner{position:relative;z-index:2}
.cta h2{font-family:var(--serif);font-size:clamp(24px,4vw,34px);font-weight:900}
.cta p{color:#cfd6e6;margin:12px auto 22px;max-width:480px;font-size:15px}
.cta .info{margin-top:26px;font-size:13px;color:#aeb6c6;line-height:1.9}
.cta .info b{color:#fff;font-weight:500}

footer{padding:30px 0 40px;text-align:center;color:var(--muted);font-size:12px;line-height:1.7}
footer .disc{max-width:560px;margin:10px auto 0}

@media(min-width:760px){
  section.sec{padding:60px 0}
  .sec-head{margin-bottom:26px}
  .banner .inner{padding:64px 24px 56px}
  .params{grid-template-columns:repeat(4,1fr)}
  .fcards{grid-template-columns:repeat(2,1fr)}
  .fcard{padding:22px}
  .stages{grid-template-columns:1fr 1fr}
  .ditem{grid-template-columns:1.1fr 1fr}
  .ditem.rev .di-img{order:2}
  .agrid{grid-template-columns:repeat(3,1fr)}
}

/* ===== 常驻侧边导航（详情页共用） ===== */
:root{--rail:80px}
.rail{position:fixed;left:0;top:0;height:100vh;width:var(--rail);background:rgba(16,29,54,.97);backdrop-filter:blur(6px);z-index:60;display:none;flex-direction:column;align-items:center;padding:14px 0;gap:1px}
.rail .brand{font-family:var(--serif);font-weight:900;color:#fff;font-size:20px;letter-spacing:.04em;margin-bottom:10px}
.rail .brand .s{color:var(--gold)}
.rail .ritem{width:100%;position:relative}
.rail a.rlink{display:flex;flex-direction:column;align-items:center;gap:2px;width:100%;padding:8px 0;color:#9aa6c0;font-size:11px;transition:.2s;border-left:3px solid transparent}
.rail a.rlink svg{width:19px;height:19px}
.rail a.rlink:hover{color:#fff}
.rail a.rlink.active{color:var(--gold);border-left-color:var(--gold)}
.rail .ritem.has-sub>a.rlink::after{content:"›";position:absolute;right:8px;top:10px;color:#7a86a0;font-size:14px}
.rail .sub{position:absolute;left:100%;top:0;min-width:128px;background:rgba(16,29,54,.98);border-radius:0 12px 12px 0;padding:6px 0;display:none;z-index:70;box-shadow:5px 6px 20px rgba(0,0,0,.34)}
.rail .ritem.has-sub:hover .sub{display:block}
.rail .sub a{display:block;padding:9px 16px;font-size:13px;color:#cdd5e6;text-align:left;white-space:nowrap}
.rail .sub a:hover{color:#fff;background:rgba(255,255,255,.09)}
.rail .sub a.active{color:var(--gold)}
.rail .spacer{flex:1}
.rail .cta-mini{background:var(--gold);color:#3a2a06;border-radius:12px;padding:8px 6px;font-weight:700;font-size:12px;width:58px;text-align:center;line-height:1.25}
.mhead{position:sticky;top:0;z-index:55;background:rgba(251,248,241,.94);backdrop-filter:blur(8px);display:flex;align-items:center;justify-content:space-between;height:58px;padding:0 18px;border-bottom:1.5px solid var(--ink)}
.mhead .wordmark{font-family:var(--serif);font-weight:900;font-size:22px}
.mhead .wordmark .s{color:var(--gold)}.mhead .wordmark small{font-family:var(--hand);font-size:16px;color:var(--coral);margin-left:3px;font-weight:400}
.mburger{background:none;border:none;font-size:25px;cursor:pointer;color:var(--ink)}
.mmenu{display:none;position:fixed;inset:58px 0 0;background:var(--navy);z-index:54;flex-direction:column;padding:14px 26px;overflow:auto}
.mmenu.open{display:flex}
.mmenu a{color:#fff;font-size:18px;padding:11px 0;border-bottom:1px solid rgba(255,255,255,.14);font-family:var(--serif)}
.mmenu a.subitem{font-size:15px;padding-left:18px;color:#cdd5e6;font-family:var(--sans)}
.railbar{position:fixed;left:0;right:0;bottom:0;z-index:58;display:flex;background:var(--white);border-top:1.5px solid var(--ink)}
.railbar a{flex:1;text-align:center;padding:13px 4px;font-size:14px;font-weight:500}
.railbar a+a{border-left:1px solid var(--line)}
.railbar .b-call{color:var(--navy)}.railbar .b-wx{color:#fff;background:var(--green)}.railbar .b-try{color:#3a2a06;background:var(--gold)}
@media(min-width:860px){
  body{padding-left:var(--rail)}
  .rail{display:flex}
  .mhead,.mmenu,.railbar{display:none}
}

/* ===== 设计感图片组件 ===== */
.split{display:grid;grid-template-columns:1fr;gap:26px;align-items:center}
/* 错落拼贴 */
.collage{position:relative;height:300px}
.collage .cp{position:absolute;border:7px solid #fff;border-radius:5px;overflow:hidden;box-shadow:0 16px 32px rgba(20,20,20,.22)}
.collage .cp img{width:100%;height:100%;object-fit:cover}
.collage .c1{width:60%;aspect-ratio:4/3;left:0;top:22px;transform:rotate(-3deg);z-index:2}
.collage .c2{width:46%;aspect-ratio:3/4;right:0;top:0;transform:rotate(3deg);z-index:3}
.collage .c3{width:40%;aspect-ratio:1/1;right:16%;bottom:0;transform:rotate(-2deg);z-index:4}
.collage .tape{position:absolute;width:64px;height:20px;background:rgba(227,165,43,.5);top:-10px;left:30%;transform:rotate(-5deg);z-index:5}
/* 媒介展示墙 */
.media{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
.mtile{position:relative;border-radius:14px;overflow:hidden;aspect-ratio:3/4}
.mtile img{width:100%;height:100%;object-fit:cover;transition:.5s}
.mtile:hover img{transform:scale(1.07)}
.mtile .ml{position:absolute;left:0;right:0;bottom:0;padding:24px 12px 11px;background:linear-gradient(transparent,rgba(16,29,54,.72));color:#fff;font-family:var(--hand);font-size:18px}
/* 整幅图文带 */
.imgband{position:relative;border-radius:18px;overflow:hidden}
.imgband img{width:100%;height:100%;object-fit:cover;aspect-ratio:21/9}
.imgband .cap{position:absolute;left:0;right:0;bottom:0;padding:46px 24px 20px;background:linear-gradient(transparent,rgba(16,29,54,.82));color:#fff}
.imgband .cap h3{font-family:var(--serif);font-size:clamp(20px,3vw,26px);font-weight:700}
.imgband .cap p{color:#dfe5ef;font-size:14px;max-width:560px;margin-top:4px}
/* 带图分龄课程卡 */
.acourses{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
.acourse{background:#fff;border-radius:16px;overflow:hidden;box-shadow:0 12px 26px rgba(20,20,20,.07);transition:transform .25s,box-shadow .25s}
.acourse:hover{transform:translateY(-6px);box-shadow:0 20px 38px rgba(20,20,20,.14)}
.acourse .ac-top{position:relative;aspect-ratio:16/10;overflow:hidden}
.acourse .ac-top img{width:100%;height:100%;object-fit:cover;transition:.5s}
.acourse:hover .ac-top img{transform:scale(1.06)}
.acourse .badge{position:absolute;left:12px;top:12px;color:#fff;border-radius:20px;padding:4px 13px;font-size:12px;font-weight:600}
.acourse.s1 .badge{background:var(--coral)}.acourse.s2 .badge{background:#e08a2b}.acourse.s3 .badge{background:var(--gold);color:#3a2a06}
.acourse.s4 .badge{background:var(--green)}.acourse.s5 .badge{background:var(--blue)}.acourse.s6 .badge{background:var(--navy)}
.acourse .ac-bd{padding:15px 18px 18px}
.acourse .phase{font-family:var(--serif);font-weight:700;font-size:18px}
.acourse .formula{font-size:12.5px;color:var(--coral);font-weight:500;margin:2px 0 6px}
.acourse.s3 .formula{color:#b58217}
.acourse p{font-size:13.5px;color:var(--muted)}
.acourse .mt{margin-top:9px;display:flex;flex-wrap:wrap;gap:6px}
.acourse .mt span{font-size:11px;background:var(--cream);color:#7a6f55;border-radius:20px;padding:2px 10px}
/* 画框瀑布流 */
.mgal{columns:2;column-gap:14px}
.mframe{break-inside:avoid;margin-bottom:14px;background:#fff;padding:7px 7px 24px;border-radius:2px;box-shadow:0 10px 22px rgba(20,20,20,.13);position:relative;transition:transform .3s,box-shadow .3s}
.mframe img{width:100%}
.mframe figcaption{font-family:var(--hand);font-size:15px;color:#555;text-align:center;padding-top:4px}
.mframe::before{content:"";position:absolute;top:-8px;left:50%;transform:translateX(-50%) rotate(-3deg);width:50px;height:16px;background:rgba(227,165,43,.5)}
.mgal .mframe:nth-child(2n){transform:rotate(1deg)}.mgal .mframe:nth-child(2n+1){transform:rotate(-1deg)}
.mgal .mframe:hover{transform:rotate(0) scale(1.03);box-shadow:0 16px 30px rgba(20,20,20,.2);z-index:2}
/* 紧凑步骤 */
.dsteps{display:flex;flex-wrap:wrap;gap:9px}
.dstep{display:flex;gap:9px;align-items:center;background:var(--white);border-radius:40px;padding:8px 16px 8px 8px;box-shadow:0 4px 10px rgba(20,20,20,.05)}
.dstep .n{font-family:var(--serif);font-weight:900;font-size:15px;background:var(--navy);color:#fff;min-width:28px;height:28px;border-radius:50%;display:flex;align-items:center;justify-content:center}
.dstep b{font-weight:700;font-size:14px}
@media(min-width:760px){
  .split{grid-template-columns:1.1fr 1fr}
  .media{grid-template-columns:repeat(5,1fr)}
  .acourses{grid-template-columns:repeat(3,1fr)}
  .mgal{columns:3}
}

/* 底部浮动菜单按钮 */
.navfab{position:fixed;right:14px;bottom:62px;z-index:59;display:inline-flex;align-items:center;gap:6px;height:46px;padding:0 18px;border-radius:24px;background:var(--navy);color:#fff;border:none;font-size:15px;font-weight:500;cursor:pointer;box-shadow:0 6px 18px rgba(0,0,0,.34);font-family:var(--sans)}
.navfab .ic{font-size:17px;line-height:1}
.navfab:active{transform:scale(.96)}
@media(min-width:860px){.navfab{display:none}}

/* 英文副标 STAR RIVER */
.rail .brand{text-align:center}
.rail .brand .ren{display:block;font-size:8px;letter-spacing:.08em;color:#9aa6c0;font-weight:400;margin-top:3px;font-family:var(--sans)}
footer .en{letter-spacing:.28em;font-size:11px;color:var(--muted);margin-top:5px;text-transform:uppercase}

/* 备案号 */
footer .icp{margin-top:8px;font-size:12px}
footer .icp a{color:var(--muted);text-decoration:underline}
@media(max-width:859px){footer{padding-bottom:110px}}