/* Mainslot88 — 暗紫学院：紫+金+黑，Stepper 学习路径 + 大编号课程卡，圆润友好 */
:root{--bg:#160f26;--surface:#221741;--surface2:#2b1e52;--ink:#f3edff;--muted:#c6b8e6;
--accent:#d4a017;--accent2:#7c4dff;--line:#3a2b5e;--radius:18px;--maxw:1120px}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:"Segoe UI",Tahoma,Arial,sans-serif;background:var(--bg);color:var(--ink);line-height:1.8;font-size:16.5px}
img{max-width:100%;height:auto}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3{line-height:1.3;font-weight:800;letter-spacing:-.005em}
.wrap,.main{max-width:var(--maxw);margin:0 auto;padding:0 22px}
/* header 渐变紫条 */
.hdr{background:linear-gradient(90deg,#241645 0%,#2b1e52 55%,#1c1136 100%);position:sticky;top:0;z-index:50;box-shadow:0 4px 24px rgba(0,0,0,.35)}
.hdr-in{max-width:var(--maxw);margin:0 auto;padding:12px 22px;display:flex;align-items:center;gap:24px}
.logo{display:flex;align-items:center;gap:10px;color:var(--ink)}
.logo-word{font-weight:800;font-size:1.22rem}
.nav{margin-left:auto}
.nav-list{display:flex;gap:6px;list-style:none}
.nav-list a{display:block;padding:9px 16px;color:var(--muted);font-weight:600;border-radius:999px}
.nav-list a:hover{color:var(--ink);background:var(--surface);text-decoration:none}
.nav-list a.active{color:#1c1136;background:var(--accent)}
.nav-toggle{display:none;background:none;border:1px solid var(--line);border-radius:12px;padding:8px;cursor:pointer}
.nav-toggle span{display:block;width:20px;height:2px;background:var(--ink);margin:4px 0}
.badge18{flex-shrink:0;display:inline-flex;align-items:center;justify-content:center;height:38px;padding:0 14px;
background:transparent;border:2px solid var(--accent2);color:#d9c8ff;font-weight:800;border-radius:999px;font-size:.85rem}
.badge18:hover{text-decoration:none;background:var(--accent2);color:#fff}
/* hero 学院：左文右图，图带光晕圆角 */
.hero{background:radial-gradient(900px 400px at 110% 0%,rgba(124,77,255,.22),transparent 55%),radial-gradient(700px 360px at -10% 100%,rgba(212,160,23,.10),transparent 55%),var(--bg)}
.hero-in{max-width:var(--maxw);margin:0 auto;padding:60px 22px 56px;display:grid;grid-template-columns:1.08fr .92fr;gap:42px;align-items:center}
.hero-h1{font-size:clamp(1.9rem,4vw,2.9rem);margin-bottom:16px}
.hero-sub{color:var(--muted);font-size:1.05rem;margin-bottom:22px}
.chips{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:22px}
.chip{background:var(--surface);border:1px solid var(--line);padding:7px 16px;border-radius:999px;color:var(--ink)}
.chip:hover{border-color:var(--accent);text-decoration:none}
.cta-row{display:flex;gap:14px;flex-wrap:wrap}
.btn{display:inline-block;padding:13px 26px;font-weight:800;border-radius:999px;font-size:.97rem}
.btn:hover{text-decoration:none;transform:translateY(-2px)}
.btn.gold{background:var(--accent);color:#1c1136;box-shadow:0 8px 24px rgba(212,160,23,.25)}
.btn.line{border:2px solid var(--accent2);color:#d9c8ff}
.hero-img{width:100%;border-radius:24px;border:1px solid var(--line);box-shadow:0 0 0 8px rgba(124,77,255,.08),0 26px 60px rgba(0,0,0,.5)}
/* stepper 学习路径（签名组件） */
.stepper-band .stepper{list-style:none;display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.stepper li a{display:flex;flex-direction:column;gap:8px;background:var(--surface);border:1px solid var(--line);
border-radius:var(--radius);padding:20px 18px;height:100%;color:var(--ink);position:relative}
.stepper li a::before{content:"";position:absolute;top:0;left:18px;right:18px;height:4px;border-radius:0 0 4px 4px;background:linear-gradient(90deg,var(--accent2),var(--accent))}
.stepper li a:hover{text-decoration:none;border-color:var(--accent)}
.step-n{font-size:.74rem;font-weight:800;text-transform:uppercase;letter-spacing:.12em;color:var(--accent)}
.step-t{font-weight:700;font-size:.98rem}
/* bands & cards */
.band{max-width:var(--maxw);margin:0 auto;padding:44px 22px}
.band>h2,.hub-cards>h2,.related>h2{font-size:1.55rem;margin-bottom:20px;text-align:center}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:18px}
.card{display:flex;flex-direction:column;gap:8px;background:var(--surface);border:1px solid var(--line);
border-radius:var(--radius);padding:20px 18px;color:var(--ink);transition:transform .15s;position:relative;overflow:hidden}
.card:hover{text-decoration:none;transform:translateY(-3px);border-color:var(--accent)}
.card-k{color:var(--accent);font-size:.72rem;font-weight:800;text-transform:uppercase;letter-spacing:.12em}
.card-t{font-weight:700;font-size:1rem;line-height:1.4}
.card-d{color:var(--muted);font-size:.89rem}
/* home prose 卡片化 */
.home-prose{max-width:840px;margin:0 auto;padding:14px 22px 26px}
.hsec{background:var(--surface);border-radius:var(--radius);padding:24px 26px;margin-bottom:16px}
.hsec h2{font-size:1.25rem;margin-bottom:10px;color:var(--accent)}
.hsec p{margin-bottom:10px;color:#e6ddf6}
/* article */
.page{max-width:840px;margin:0 auto;padding:28px 22px 56px}
.crumbs{margin-bottom:16px}
.crumbs ol{list-style:none;display:flex;flex-wrap:wrap;gap:6px;font-size:.83rem;color:var(--muted)}
.crumbs li+li::before{content:"›";margin-right:6px;color:var(--accent2)}
.crumbs a{color:var(--muted)}
.pg-h1{font-size:clamp(1.6rem,3.3vw,2.25rem);margin-bottom:12px}
.meta-row{display:flex;flex-wrap:wrap;gap:16px;color:var(--muted);font-size:.83rem;margin-bottom:20px}
.lead{font-size:1.1rem;background:var(--surface);border-radius:var(--radius);padding:20px 22px;margin-bottom:24px}
.art-body .blk{margin-bottom:26px}
.art-body h2{font-size:1.35rem;margin-bottom:12px;color:var(--accent)}
.art-body p{margin-bottom:13px}
.blk-list{margin:0 0 12px 22px}
.blk-list li{margin-bottom:8px}
.tbl-wrap{overflow-x:auto;margin:16px 0}
.blk-table{border-collapse:collapse;width:100%;min-width:520px;font-size:.93rem}
.blk-table th{background:var(--accent2);color:#fff;text-align:left;padding:11px 14px}
.blk-table td{border:1px solid var(--line);padding:10px 14px;background:var(--surface)}
.callout{background:rgba(212,160,23,.1);border:1px solid var(--accent);border-radius:14px;padding:16px 18px;margin:16px 0}
.toc{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:18px 22px;margin-bottom:26px}
.toc ol{margin:8px 0 0 22px}
.toc li{margin-bottom:5px;font-size:.93rem}
.fig{margin:24px 0;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:12px}
/* faq */
.faq{margin-top:32px}
.faq h2,.faq-cat h2{font-size:1.35rem;margin-bottom:14px;color:var(--accent)}
.faq-item{background:var(--surface);border:1px solid var(--line);border-radius:14px;margin-bottom:10px}
.faq-item summary{cursor:pointer;padding:15px 18px;font-weight:700;list-style:none}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"＋";float:right;color:var(--accent);font-weight:800}
.faq-item[open] summary::after{content:"－"}
.faq-a{padding:0 18px 16px;color:#d9cef0}
.faq-cat{margin-bottom:30px}
/* boxes */
.rgbox{background:rgba(192,57,43,.12);border:1.5px solid #c0392b;border-radius:14px;padding:16px 18px;margin:30px 0 6px;font-size:.95rem}
.agebox{display:flex;gap:18px;align-items:center;background:var(--surface);border:1.5px solid #c0392b;padding:20px;border-radius:var(--radius);margin:20px 0}
.age18{font-size:1.5rem;font-weight:900;color:#ffb3ab;border:3px solid #c0392b;border-radius:50%;width:70px;height:70px;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.mailbox{background:var(--surface);border:1px dashed var(--accent);padding:20px 22px;border-radius:var(--radius);margin:20px 0}
.mailbox span{display:block;color:var(--muted);font-size:.85rem}
.mailbox strong{font-size:1.2rem;color:var(--accent)}
.related{margin-top:32px}
/* footer */
.ftr{background:#120b20;border-top:4px solid var(--accent2);margin-top:64px}
.ftr-in{max-width:var(--maxw);margin:0 auto;padding:46px 22px 26px}
.ftr-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr 1fr;gap:32px}
.ftr-brand{display:flex;flex-direction:column;gap:10px;align-items:flex-start}
.ftr-name{font-weight:800;font-size:1.12rem}
.ftr-blurb{color:var(--muted);font-size:.9rem}
.ftr-col h3{color:var(--accent);font-size:.78rem;text-transform:uppercase;letter-spacing:.13em;margin-bottom:12px}
.ftr-col ul{list-style:none}
.ftr-col li{margin-bottom:8px}
.ftr-col a{color:var(--muted);font-size:.92rem}
.ftr-col a:hover{color:var(--ink)}
.ftr-legal{border-top:1px solid var(--line);margin-top:30px;padding-top:20px;color:#a493c9;font-size:.8rem}
.ftr-legal p{margin-bottom:8px}
.p404{text-align:center;padding-top:70px}
@media(max-width:960px){
.hero-in{grid-template-columns:1fr}
.stepper-band .stepper{grid-template-columns:1fr 1fr}
.ftr-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:860px){
.nav-toggle{display:block}
.nav-list{display:none;position:absolute;top:100%;left:0;right:0;background:#1c1136;flex-direction:column;padding:10px 22px 16px}
.nav-list.open{display:flex}
}
@media(max-width:640px){body{font-size:15.5px}.cards{grid-template-columns:1fr}.stepper-band .stepper{grid-template-columns:1fr}.ftr-grid{grid-template-columns:1fr}.hdr-in{gap:10px}.logo-word{font-size:1rem}}

/* ===== SEO polish：点击目标 >=24px（inline 链接热区） ===== */
.crumbs a{display:inline-block;padding:4px 0}
.toc a,.art-body a,.lead a,.faq-a a,.hsec a,.rgbox a,.callout a,
.blk-list a,.mailbox a,.ftr-col a,.ftr-blurb a,.meta-row a,
.card-d a,.tile-d a,.step-t a,.psteps a,.checklist a{padding:3px 0}