/* brand2：官网首页/项目页升级（2026-11）。叠在 brand.css 之上：极光背景、玻璃卡片、渐变标题、逐点批改实演卡、滚动入场。 */
:root{--a1:#7C6CFF;--a2:#4FE3B0;--glass:rgba(255,255,255,.06);--glassb:rgba(255,255,255,.14)}
body{background:#070A14;font-family:-apple-system,BlinkMacSystemFont,"SF Pro Text","PingFang SC","HarmonyOS Sans SC","Microsoft YaHei","Noto Sans SC",sans-serif}
.hero{background:#070A14}
.hero .fallback{background:radial-gradient(38% 30% at 20% 22%,rgba(124,108,255,.45),transparent 70%),radial-gradient(34% 28% at 82% 30%,rgba(79,227,176,.28),transparent 70%),radial-gradient(40% 32% at 52% 92%,rgba(46,125,209,.32),transparent 70%);animation:b2dr 16s ease-in-out infinite alternate}
@keyframes b2dr{to{transform:translate(5%,3%) rotate(6deg) scale(1.08)}}
.hero .veil{background:linear-gradient(180deg,rgba(7,10,20,.2),rgba(7,10,20,.1) 40%,rgba(7,10,20,.7))}
.hero::after{content:"";position:absolute;inset:0;z-index:1;pointer-events:none;background-image:linear-gradient(rgba(255,255,255,.035) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.035) 1px,transparent 1px);background-size:56px 56px;-webkit-mask:radial-gradient(70% 60% at 50% 40%,#000,transparent);mask:radial-gradient(70% 60% at 50% 40%,#000,transparent)}
.eyebrow{color:var(--a2);letter-spacing:.24em}
.hero h1{font-family:inherit;font-weight:750;letter-spacing:-.02em}
.hero h1 em{font-style:normal;background:linear-gradient(90deg,#9D8FFF,#4FE3B0);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero .en{color:rgba(255,255,255,.7)}
.brand b{font-family:inherit}
.btn-gold{background:linear-gradient(90deg,#7C6CFF,#4FE3B0);color:#06101F;border-color:transparent}
.btn-gold:hover{background:linear-gradient(90deg,#8D7FFF,#63F0C0);box-shadow:0 12px 34px rgba(79,227,176,.4)}
.btn-line{border-color:rgba(255,255,255,.3);background:var(--glass);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px)}
.choice{background:var(--glass)!important;border:1px solid var(--glassb)!important;backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);transition:transform .3s cubic-bezier(.2,.8,.2,1),border-color .3s,box-shadow .3s}
.choice:hover{transform:translateY(-4px);border-color:rgba(79,227,176,.6)!important;box-shadow:0 18px 50px rgba(79,227,176,.14)}
.choice .t{font-family:inherit;font-weight:700}
.hero .inner .wrap.two{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,.9fr);gap:48px;align-items:center}
.two h1{font-size:clamp(30px,3.7vw,52px)}
.hero .en,.choice .te,.sec .lead i,.feat i{font-style:normal;font-family:inherit}
.two .choices{margin-top:26px;gap:12px}
.two .choice{padding:18px 18px 16px}.two .choice .t{font-size:21px}.two .choice .d{font-size:12px}.two .choice .go{width:34px;height:34px;right:14px;top:14px;font-size:15px}
.hero .inner{padding-top:96px}
.demo{position:relative;background:var(--glass);border:1px solid var(--glassb);border-radius:22px;padding:20px;backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);box-shadow:0 30px 80px rgba(0,0,0,.45);animation:b2fl 6s ease-in-out infinite alternate;color:#E8ECF6}
@keyframes b2fl{to{transform:translateY(-8px)}}
.demo .top{display:flex;justify-content:space-between;font-size:12px;color:#8A93B2;letter-spacing:.06em}
.demo .live{display:inline-flex;align-items:center;gap:6px;color:#4FE3B0}.demo .live i{width:6px;height:6px;border-radius:50%;background:#4FE3B0;animation:b2bl 1.4s infinite}
@keyframes b2bl{50%{opacity:.25}}
.demo .q{font-size:15px;line-height:1.7;margin:12px 0 10px;min-height:52px}
.demo ul{list-style:none;margin:0;padding:0}
.demo li{display:flex;align-items:center;gap:10px;padding:8px 10px;border-radius:10px;font-size:13.5px;margin:0 0 6px;background:rgba(255,255,255,.04);opacity:0;transform:translateX(-10px);transition:opacity .45s,transform .45s cubic-bezier(.2,.8,.2,1)}
.demo li.on{opacity:1;transform:none}
.demo li .k{width:20px;height:20px;border-radius:50%;flex:none;display:flex;align-items:center;justify-content:center;font-size:12px;background:rgba(79,227,176,.18);color:#4FE3B0}
.demo li.x .k{background:rgba(255,107,134,.18);color:#FF6B86}
.demo li .m{margin-left:auto;font:600 12px ui-monospace,Menlo,monospace;color:#8A93B2}
.demo .sc{display:flex;align-items:center;gap:14px;margin-top:12px}
.demo .ring{--p:0;width:64px;height:64px;border-radius:50%;flex:none;background:conic-gradient(#4FE3B0 calc(var(--p)*1%),rgba(255,255,255,.12) 0);-webkit-mask:radial-gradient(farthest-side,transparent calc(100% - 7px),#000 calc(100% - 6.5px));mask:radial-gradient(farthest-side,transparent calc(100% - 7px),#000 calc(100% - 6.5px));transition:--p 1.1s cubic-bezier(.2,.8,.2,1);filter:drop-shadow(0 0 6px rgba(79,227,176,.6))}
@property --p{syntax:"<number>";inherits:true;initial-value:0}
.demo .num{font:600 28px ui-monospace,Menlo,monospace;letter-spacing:-.03em}.demo .num small{font-size:14px;color:#8A93B2}
.demo .tip{font-size:12.5px;color:#8A93B2;line-height:1.5}
.sec{background:#0B0F1E;color:#E8ECF6}.sec.alt{background:#090C19}
.sec h2{font-family:inherit;font-weight:750;letter-spacing:-.02em;color:#fff}.sec .lead{color:#9AA3C2}
.feat .card{background:var(--glass);border:1px solid var(--glassb);color:#E8ECF6;box-shadow:none;transition:transform .3s cubic-bezier(.2,.8,.2,1),border-color .3s}
.feat .card:hover{transform:translateY(-4px);border-color:rgba(124,108,255,.6)}
.feat .card h3{color:#fff}.feat .card .no{color:var(--a2);font-family:ui-monospace,Menlo,monospace}.feat .card .h3e,.feat .card p{color:#9AA3C2}
.chip{background:var(--glass)!important;border:1px solid var(--glassb)!important;color:#E8ECF6!important}
.track h3{color:#fff}.note{background:var(--glass)!important;border:1px solid var(--glassb)!important;color:#C9D0E8!important}
.cta-band{background:linear-gradient(135deg,#17123F,#0A2A2A)}
.foot{background:#05070F}
.rv2{opacity:0;transform:translateY(22px);transition:opacity .7s cubic-bezier(.2,.8,.2,1),transform .7s cubic-bezier(.2,.8,.2,1)}.rv2.in{opacity:1;transform:none}
@media(max-width:900px){.hero .inner .wrap.two{grid-template-columns:1fr;gap:28px}.demo{animation:none}}
@media(prefers-reduced-motion:reduce){.hero .fallback,.demo,.demo .live i{animation:none}.rv2{opacity:1;transform:none}.demo li{opacity:1;transform:none}}

.choice .go{background:linear-gradient(135deg,#7C6CFF,#4FE3B0)!important;color:#06101F!important;box-shadow:0 6px 20px rgba(79,227,176,.25)}

/* ---- 三幕演示：批改 / 讲解视频 / 热力图 ---- */
.demo .tabs{display:flex;gap:6px;margin:0 0 14px}
.demo .tabs button{flex:1;position:relative;overflow:hidden;border:1px solid var(--glassb);background:transparent;color:#8A93B2;border-radius:10px;padding:7px 6px;font:500 12.5px inherit;font-family:inherit;cursor:pointer;transition:color .2s,border-color .2s,background .2s}
.demo .tabs button.on{color:#fff;border-color:rgba(79,227,176,.55);background:rgba(79,227,176,.08)}
.demo .tabs button i{position:absolute;left:0;bottom:0;height:2px;width:0;background:linear-gradient(90deg,#7C6CFF,#4FE3B0)}
.demo .tabs button.on i{animation:b2tab var(--dur,7s) linear forwards}
@keyframes b2tab{to{width:100%}}
.demo .stage{position:relative;min-height:340px}
.demo .scn{position:absolute;inset:0;opacity:0;transform:translateY(10px);pointer-events:none;transition:opacity .5s,transform .5s cubic-bezier(.2,.8,.2,1)}
.demo .scn.on{opacity:1;transform:none;pointer-events:auto}
.demo .dots{display:flex;gap:6px;justify-content:center;margin-top:10px}.demo .dots i{width:6px;height:6px;border-radius:50%;background:rgba(255,255,255,.2);transition:.3s}.demo .dots i.on{background:#4FE3B0;width:18px;border-radius:3px}
.demo .foot-note{text-align:center;font-size:11px;color:#6B7494;margin-top:6px;letter-spacing:.06em}
.demo .tip{font-size:12.5px;color:#9AA3C2;line-height:1.55;margin-top:10px}
.demo .vid{margin-top:12px;border-radius:14px;overflow:hidden;border:1px solid rgba(255,255,255,.14);background:#FFFDF7;color:#1d2a5a}
.demo .vid .bd{position:relative;padding:34px 16px 12px;min-height:190px;background-image:linear-gradient(#F1ECDC 1px,transparent 1px);background-size:100% 30px}
.demo .vchip{position:absolute;left:10px;top:9px;background:#141B2D;color:#E8ECF6;border-radius:999px;padding:2px 10px;font-size:11px}
.demo .wl{font:500 17px "Kaiti SC","STKaiti","KaiTi",serif;margin:4px 0;clip-path:inset(0 100% 0 0)}
.demo .scn.on .wl{animation:b2rv 1.1s steps(18) var(--d,0s) forwards}
@keyframes b2rv{to{clip-path:inset(0 0 0 0)}}
.demo .gr{width:150px;height:72px;margin:2px 0;display:block}
.demo .gr .ax{fill:none;stroke:#6b7280;stroke-width:1.2}.demo .gr .cv{fill:none;stroke:#1f6feb;stroke-width:2.2;stroke-linecap:round;stroke-dasharray:140;stroke-dashoffset:140}
.demo .gr .pt{fill:#d11a2a;opacity:0}
.demo .scn.on .gr .cv{animation:b2dw 1.4s ease 2.1s forwards}.demo .scn.on .gr .pt{animation:b2fd .4s ease 3.4s forwards}
@keyframes b2dw{to{stroke-dashoffset:0}}@keyframes b2fd{to{opacity:1}}
.demo .vid .bar{display:flex;align-items:center;gap:10px;background:#141B2D;color:#E8ECF6;padding:7px 12px;font-size:12px}
.demo .vid .pg{flex:1;height:4px;border-radius:2px;background:rgba(255,255,255,.2);overflow:hidden}.demo .vid .pg i{display:block;height:100%;width:0;background:linear-gradient(90deg,#7C6CFF,#4FE3B0)}
.demo .scn.on .pg i{animation:b2pg var(--dur,7s) linear forwards}@keyframes b2pg{to{width:100%}}
.demo .wv{display:inline-flex;gap:2px;align-items:center;height:14px}.demo .wv b{width:2px;height:4px;border-radius:1px;background:#4FE3B0}
.demo .scn.on .wv b{animation:b2wv .8s ease-in-out infinite alternate}.demo .wv b:nth-child(2){animation-delay:.1s}.demo .wv b:nth-child(3){animation-delay:.25s}.demo .wv b:nth-child(4){animation-delay:.15s}.demo .wv b:nth-child(5){animation-delay:.35s}
@keyframes b2wv{to{height:14px}}
.demo .hmx{display:grid;grid-template-columns:repeat(9,1fr);gap:4px;margin-top:12px}
.demo .hmx i{aspect-ratio:1.25;border-radius:5px;background:rgba(255,255,255,.08);transform:scale(.4);opacity:0;transition:transform .45s cubic-bezier(.3,1.5,.5,1),opacity .3s}
.demo .hmx.go i{transform:none;opacity:1}
.demo .hmx i.nm{background:none;aspect-ratio:auto;font-size:11px;color:#8A93B2;display:flex;align-items:center;transform:none;opacity:1}
.demo .hmx i.col{box-shadow:0 0 0 1.5px rgba(255,255,255,.85)}
.demo .hl-note{margin-top:12px;display:flex;align-items:baseline;gap:8px;font-size:14px}.demo .hl-note b{color:#FF8DA0}.demo .hl-note small{color:#8A93B2;font-size:12px;margin-left:auto}
.demo .lg{display:flex;gap:12px;font-size:11px;color:#8A93B2;margin-top:10px}.demo .lg i{display:inline-block;width:9px;height:9px;border-radius:3px;margin-right:4px}
@media(prefers-reduced-motion:reduce){.demo .wl{clip-path:none}.demo .gr .cv{stroke-dashoffset:0}.demo .gr .pt{opacity:1}.demo .tabs button.on i{width:100%;animation:none}}

.feat{grid-template-columns:repeat(2,minmax(0,1fr))}@media(min-width:1100px){.feat{grid-template-columns:repeat(4,minmax(0,1fr))}}@media(max-width:860px){.feat{grid-template-columns:1fr}}