/* ai 页面样式。
 * 只在本路由加载（RouteStyles 切换 <link data-css="page"> 的 href）。
 * 不要把它合并进全局样式，也不要给选择器加作用域前缀：
 * 本文件里的 .footer-grid (0,1,0) 现在是被 motion.css 的
 * .site-footer .footer-grid (0,2,0) 压住的。一旦加前缀变成 (0,2,0)
 * 且文档顺序更靠后，本文件反而会赢，footer 会切成 4 栏网格（DOM 里只有 2 个子元素）。
 */
:root{--orange:#f39a2f;--orange2:#ffb554;--orange-soft:#fff5e8;--blue:#357fc4;--blue2:#62b4f5;--blue-soft:#edf7ff;--navy:#103e6b;--navy-deep:#062c50;--ink:#18324a;--muted:#6f8295;--line:#e2ecf4;--white:#fff;--shadow:0 22px 70px rgba(22,71,111,.13)}
*{box-sizing:border-box}html{scroll-behavior:smooth;font-size:16px}body{margin:0;color:var(--ink);background:#fff;font-family:"PingFang SC","Microsoft YaHei","Noto Sans SC",Arial,sans-serif;font-size:16px;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}img{display:block;max-width:100%}small{font-size:12px}.wrap{width:min(1200px,calc(100% - 48px));margin:0 auto}
.top-note{height:34px;color:rgba(255,255,255,.76);background:var(--navy-deep);font-size:12px;letter-spacing:.4px}.top-note-inner{height:34px;display:flex;align-items:center;justify-content:space-between}.top-note-inner span:last-child{color:#fff}
.site-header{height:78px;background:rgba(255,255,255,.97);box-shadow:0 7px 28px rgba(18,57,91,.06);position:relative;z-index:20}.nav-wrap{height:100%;display:flex;align-items:center}.brand{width:248px;overflow:hidden}.brand img{width:238px;height:42px;object-fit:cover}.main-nav{flex:1;height:100%;display:flex;justify-content:center;gap:40px}.main-nav a{height:100%;display:flex;align-items:center;position:relative;color:#304861;font-size:15px}.main-nav a::after{content:"";position:absolute;left:50%;bottom:0;width:0;height:3px;border-radius:4px;transform:translateX(-50%);background:linear-gradient(90deg,var(--orange),#ffc36b)}.main-nav a.active{color:var(--navy);font-weight:700}.main-nav a.active::after{width:52px}.nav-call{min-width:178px;height:48px;padding:0 14px;display:flex;align-items:center;gap:10px;color:#fff;border-radius:10px;background:linear-gradient(135deg,#4b9ce8,#2d75b8);box-shadow:0 9px 22px rgba(52,127,196,.2);font-size:14px;font-weight:700}.nav-call i{width:26px;height:26px;display:grid;place-items:center;border-radius:50%;background:rgba(255,255,255,.18);font-style:normal}.nav-call small{display:block;font-size:12px;font-weight:400;opacity:.8;margin-bottom:2px}
.hero{height:820px;position:relative;overflow:hidden;background:linear-gradient(135deg,#f9fcff 0%,#eef8ff 47%,#fff9f0 100%)}.hero-grid,.cloud-grid,.companion-grid-bg{position:absolute;inset:0;background-image:linear-gradient(rgba(52,127,196,.055) 1px,transparent 1px),linear-gradient(90deg,rgba(52,127,196,.055) 1px,transparent 1px);background-size:48px 48px;mask-image:linear-gradient(90deg,black,transparent)}.hero-orb{position:absolute;border-radius:50%;filter:blur(5px)}.orb-one{width:430px;height:430px;right:-170px;top:-180px;background:rgba(92,179,245,.13)}.orb-two{width:330px;height:330px;left:-170px;bottom:-180px;background:rgba(243,154,47,.11)}.hero-layout{height:700px;display:grid;grid-template-columns:.88fr 1.12fr;gap:70px;align-items:center;position:relative}.hero-copy{padding-bottom:10px}.eyebrow{display:inline-flex;align-items:center;gap:9px;color:#376d9d;font-size:12px;font-weight:800;letter-spacing:1.6px}.eyebrow span{width:30px;height:30px;display:grid;place-items:center;color:#fff;border-radius:9px;background:linear-gradient(135deg,var(--blue2),var(--blue));letter-spacing:0}.hero h1{margin:23px 0 20px;color:var(--navy-deep);font-size:58px;line-height:1.16;letter-spacing:-2.8px}.hero h1 em{color:var(--orange);font-style:normal}.hero-copy>p{max-width:515px;margin:0;color:#536c83;font-size:18px;line-height:1.9}.hero-tags{display:flex;gap:10px;margin:27px 0 34px}.hero-tags span{padding:8px 13px;color:#507089;border:1px solid rgba(53,127,196,.13);border-radius:7px;background:rgba(255,255,255,.7);font-size:12px}.primary-btn{height:52px;padding:0 24px;display:inline-flex;align-items:center;gap:22px;color:#fff;border-radius:9px;background:linear-gradient(135deg,#f7a744,#ed871c);box-shadow:0 14px 30px rgba(240,141,31,.25);font-size:14px;font-weight:700}.primary-btn b{font-size:18px}
.ai-brain{height:520px;padding:25px;border:1px solid rgba(75,160,230,.14);border-radius:26px;background:linear-gradient(145deg,#0e4775,#082f55 70%);box-shadow:0 35px 80px rgba(11,55,91,.25);position:relative;overflow:hidden}.ai-brain::after{content:"";position:absolute;width:280px;height:280px;right:-120px;top:-120px;border-radius:50%;background:rgba(77,176,247,.16)}.brain-head{position:relative;z-index:2;display:flex;align-items:center;justify-content:space-between;padding-bottom:20px;border-bottom:1px solid rgba(255,255,255,.1)}.brain-head span{color:#72bcf7;font-size:12px;letter-spacing:2px}.brain-head b{color:#fff;font-size:14px}.brain-stage{height:355px;position:relative}.core{position:absolute;left:50%;top:50%;width:154px;height:154px;transform:translate(-50%,-50%);display:grid;place-items:center;align-content:center;border:1px solid rgba(127,205,255,.45);border-radius:50%;color:#fff;background:radial-gradient(circle at 35% 30%,#5fb5f4,#1a6aa8 55%,#0b416d);box-shadow:0 0 0 15px rgba(91,175,240,.08),0 0 55px rgba(70,171,243,.38)}.core span{font-size:12px;letter-spacing:2px;opacity:.72}.core strong{font-size:54px;line-height:1}.core small{font-size:12px;opacity:.76}.orbit{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);border:1px solid rgba(115,193,251,.18);border-radius:50%}.orbit-a{width:300px;height:300px}.orbit-b{width:440px;height:270px}.satellite{position:absolute;width:165px;padding:14px 15px;border:1px solid rgba(255,255,255,.1);border-radius:12px;color:#fff;background:rgba(255,255,255,.075);backdrop-filter:blur(9px);box-shadow:0 10px 30px rgba(2,25,46,.15)}.satellite i{color:var(--orange2);font-size:12px;font-style:normal}.satellite b{display:block;margin:5px 0;color:#fff;font-size:13px}.satellite span{color:rgba(255,255,255,.55);font-size:12px}.s-one{left:0;top:40px}.s-two{right:0;top:40px}.s-three{left:50%;bottom:0;transform:translateX(-50%)}.record{height:55px;padding:0 16px;display:flex;align-items:center;gap:11px;border:1px solid rgba(255,255,255,.08);border-radius:12px;background:rgba(255,255,255,.06);position:relative;z-index:2}.record>span{width:27px;height:30px;display:grid;place-items:center;color:#6fc0fa;background:rgba(92,181,247,.13);clip-path:polygon(50% 0,95% 17%,86% 75%,50% 100%,14% 75%,5% 17%)}.record p{margin:0;color:rgba(255,255,255,.54);font-size:12px;line-height:1.6}.record b{color:#fff;font-weight:500}.hero-stats{height:120px;padding:0 30px;display:grid;grid-template-columns:repeat(4,1fr);position:relative;background:rgba(255,255,255,.9);border:1px solid rgba(32,104,165,.08);border-radius:18px 18px 0 0;box-shadow:0 15px 50px rgba(25,71,111,.08)}.hero-stats>div{display:flex;flex-direction:column;align-items:center;justify-content:center;position:relative}.hero-stats>div:not(:last-child)::after{content:"";position:absolute;right:0;width:1px;height:42px;background:var(--line)}.hero-stats b{color:var(--navy);font-size:30px}.hero-stats span{margin-top:8px;color:#7a8fa2;font-size:12px}
.intro{padding:100px 0 60px}.section-heading>span{color:var(--blue);font-size:12px;font-weight:800;letter-spacing:2.8px}.section-heading h2{margin:12px 0 10px;color:var(--navy-deep);font-size:38px;line-height:1.4}.section-heading p{max-width:680px;margin:0 auto;color:#7c8d9d;font-size:15px;line-height:1.8}.center{text-align:center}.section-heading.light>span{color:#72bcf7}.section-heading.light h2{color:#fff}.section-heading.light p{color:rgba(255,255,255,.6)}
.module{padding:100px 0}.module.tinted{background:linear-gradient(180deg,#f8fbfe,#fff)}.module-layout{display:grid;grid-template-columns:.83fr 1.17fr;gap:78px;align-items:center}.module-layout.reverse{grid-template-columns:1.17fr .83fr}.module-layout.reverse .module-copy{grid-column:2}.module-layout.reverse .product-window{grid-row:1;grid-column:1}.module-index{display:flex;align-items:center;gap:12px}.module-index b{color:var(--orange);font-size:18px}.module-index span{color:#86a0b6;font-size:12px;font-weight:700;letter-spacing:2px}.module-tag{display:inline-block;margin:20px 0 10px;padding:7px 11px;border-radius:5px;font-size:12px;font-weight:700}.module-tag.blue{color:#2f77b6;background:#eaf5ff}.module-tag.orange{color:#bd6b14;background:#fff1de}.module-copy h2{margin:0 0 18px;color:var(--navy-deep);font-size:42px}.module-copy .lead{margin:0 0 23px;color:#5b7185;font-size:16px;line-height:1.9}.module-copy ul,.pair-copy ul,.planning-grid article>ul{margin:0;padding:0;list-style:none;display:grid;gap:13px}.module-copy li,.pair-copy li,.planning-grid article>ul li{position:relative;padding-left:21px;color:#435e75;font-size:13px}.module-copy li::before,.pair-copy li::before,.planning-grid article>ul li::before{content:"✓";position:absolute;left:0;color:var(--blue);font-weight:900}.flow{margin-top:31px;display:flex;align-items:center;gap:9px}.flow span{padding:8px 10px;border-radius:6px;color:#37678e;background:#eff7fd;font-size:12px;font-weight:700}.flow i{width:15px;height:1px;background:#a6c9e4;position:relative}.flow i::after{content:"";position:absolute;right:0;top:-2px;border-left:4px solid #a6c9e4;border-top:2px solid transparent;border-bottom:2px solid transparent}.data-note{margin-top:30px;padding:16px 18px;border-left:3px solid var(--orange);border-radius:0 9px 9px 0;background:var(--orange-soft)}.data-note strong,.data-note span{display:block}.data-note strong{color:#8c581c;font-size:13px}.data-note span{margin-top:5px;color:#9a7d5e;font-size:12px}
.product-window{min-height:450px;border:1px solid #dce9f3;border-radius:18px;background:#fff;box-shadow:var(--shadow);overflow:hidden}.window-bar{height:49px;padding:0 18px;display:flex;align-items:center;gap:6px;border-bottom:1px solid #e7eff5;color:#8aa0b3;font-size:12px}.window-bar>span{width:7px;height:7px;border-radius:50%;background:#d8e2e9}.window-bar>span:first-child{background:#f4a044}.window-bar b{margin-left:12px;color:#34516a}.window-bar i{margin-left:auto;font-style:normal;letter-spacing:2px}
.chat-window{padding-bottom:18px;background:#f7fbfe}.question-card{margin:17px;padding:16px 18px;border:1px solid #e2ebf3;border-radius:12px;background:#fff}.question-card small{color:#8da2b5;font-size:12px}.question-card p{margin:7px 0 10px;color:#1e405f;font-size:14px;font-weight:700}.question-card span{padding:4px 8px;border-radius:4px;color:#467da8;background:#edf7ff;font-size:12px}.chat{margin:12px 17px;display:flex;align-items:flex-start;gap:9px}.chat i{width:28px;height:28px;display:grid;place-items:center;flex:0 0 auto;border-radius:8px;color:#fff;background:linear-gradient(135deg,#5bb0f1,#347fc4);font-size:12px;font-style:normal;font-weight:800}.chat p{margin:0;padding:11px 13px;color:#546c81;border:1px solid #e0ebf3;border-radius:0 11px 11px;background:#fff;font-size:12px;line-height:1.65}.chat p b{color:#274e70}.chat.user{justify-content:flex-end}.chat.user i{background:linear-gradient(135deg,#ffb85e,#ef9127)}.chat.user p{color:#8b5d27;border-color:#f6dfc2;background:#fff8ee;border-radius:11px 0 11px 11px}.chat.active p{box-shadow:0 8px 25px rgba(49,128,194,.1)}.answer-box{height:45px;margin:15px 17px 0;padding:0 10px 0 15px;display:flex;align-items:center;justify-content:space-between;color:#a1afbc;border:1px solid #dce9f3;border-radius:9px;background:#fff;font-size:12px}.answer-box b{width:29px;height:29px;display:grid;place-items:center;color:#fff;border-radius:8px;background:var(--blue)}
.lesson-window{padding:18px;background:#f5f9fc}.video-area{height:260px;padding:23px;position:relative;overflow:hidden;border-radius:13px;background:linear-gradient(145deg,#0c3e68,#082b4c)}.video-area::after{content:"";position:absolute;width:190px;height:190px;right:-70px;top:-80px;border-radius:50%;background:rgba(68,168,240,.15)}.lesson-board{width:68%;height:170px;padding:20px;color:#fff;border:1px solid rgba(255,255,255,.13);border-radius:9px;background:rgba(255,255,255,.06);position:relative;z-index:2}.lesson-board small,.lesson-board strong,.lesson-board span{display:block}.lesson-board small{color:#6fbafb;font-size:12px}.lesson-board strong{margin:10px 0 14px;font-size:23px}.lesson-board span{margin-top:8px;color:rgba(255,255,255,.72);font-size:13px}.teacher-orb{position:absolute;right:42px;top:67px;width:82px;height:82px;display:grid;place-items:center;color:#fff;border:1px solid rgba(255,255,255,.2);border-radius:50%;background:linear-gradient(135deg,#61b7f5,#347fc4);box-shadow:0 0 0 10px rgba(93,181,245,.09);font-size:22px;font-weight:800;z-index:2}.timeline{position:absolute;left:23px;right:23px;bottom:18px;height:3px;border-radius:3px;background:rgba(255,255,255,.17);z-index:3}.timeline i{display:block;width:54%;height:3px;background:var(--orange)}.timeline b,.timeline span{position:absolute;top:8px;color:rgba(255,255,255,.55);font-size:12px}.timeline b{left:0}.timeline span{right:0}.pause-card{margin-top:13px;padding:14px;display:flex;align-items:center;gap:12px;border:1px solid #f5d9b7;border-radius:11px;background:#fff8ef}.pause-card .mic{width:37px;height:37px;display:grid;place-items:center;color:#fff;border-radius:50%;background:var(--orange)}.pause-card small,.pause-card b{display:block}.pause-card small{color:#a88459;font-size:12px}.pause-card b{margin-top:4px;color:#714819;font-size:12px}.wave{height:49px;display:flex;align-items:center;justify-content:center;gap:5px;color:#7890a5}.wave i{width:3px;height:12px;border-radius:3px;background:#5daef0}.wave i:nth-child(2n){height:22px}.wave i:nth-child(3n){height:16px}.wave span{margin-left:8px;font-size:12px}
.diagnostic-window{padding:24px;background:linear-gradient(180deg,#fff,#f8fbfe)}.dash-title{display:flex;align-items:center;justify-content:space-between;padding-bottom:18px;border-bottom:1px solid #e7eff5}.dash-title small,.dash-title b{display:block}.dash-title small{color:#8aa0b3;font-size:12px}.dash-title b{margin-top:4px;color:#294b69;font-size:14px}.dash-title>span{padding:6px 9px;color:#3980bd;border-radius:5px;background:#edf7ff;font-size:12px}.diagnostic-main{display:grid;grid-template-columns:1fr 1fr;gap:23px;padding:24px 0}.radar{height:240px;position:relative;display:grid;place-items:center}.radar>i{position:absolute;width:156px;height:156px;border:1px solid #d7e7f3;clip-path:polygon(50% 0,98% 35%,80% 93%,20% 93%,2% 35%)}.radar .r2{width:125px;height:125px}.radar .r3{width:94px;height:94px}.radar .r4{width:63px;height:63px}.radar .r5{width:32px;height:32px}.radar-shape{width:122px;height:130px;clip-path:polygon(50% 0,90% 39%,72% 88%,24% 80%,7% 35%);background:linear-gradient(145deg,rgba(63,152,219,.65),rgba(243,154,47,.52))}.radar strong{position:absolute;color:#fff;font-size:22px;text-shadow:0 2px 9px rgba(11,57,93,.35)}.radar strong small{font-size:12px}.rp{position:absolute;color:#718ba1;font-size:12px}.p1{top:18px}.p2{right:7px;top:81px}.p3{right:29px;bottom:20px}.p4{left:29px;bottom:20px}.p5{left:7px;top:81px}.weak-list{padding-top:12px}.weak-list>small{color:#7c92a5;font-size:12px}.weak-list>div{margin-top:19px;position:relative;padding-bottom:10px;border-bottom:4px solid #ecf2f6;color:#425f78;font-size:12px}.weak-list div b{float:right;color:var(--orange)}.weak-list div i{position:absolute;left:0;bottom:-4px;width:var(--w);height:4px;border-radius:4px;background:linear-gradient(90deg,var(--blue2),var(--blue))}.plan-strip{min-height:68px;padding:12px 13px;display:flex;align-items:center;gap:11px;border:1px solid #dcebf5;border-radius:11px;background:#f1f9ff}.plan-strip>i{width:34px;height:34px;display:grid;place-items:center;flex:0 0 auto;color:#fff;border-radius:9px;background:var(--blue);font-size:12px;font-style:normal}.plan-strip p{flex:1;margin:0}.plan-strip b,.plan-strip span{display:block}.plan-strip b{color:#315775;font-size:12px}.plan-strip span{margin-top:4px;color:#8ba0b1;font-size:12px}.plan-strip button{padding:8px 10px;color:#fff;border:0;border-radius:6px;background:var(--orange);font-size:12px}
.pair-section{padding:105px 0;background:linear-gradient(145deg,#0d426f,#062d51);position:relative;overflow:hidden}.pair-section::after{content:"";position:absolute;right:-120px;bottom:-180px;width:420px;height:420px;border-radius:50%;background:rgba(243,154,47,.1)}.pair-grid{margin-top:48px;display:grid;grid-template-columns:1fr 1fr;gap:24px;position:relative;z-index:2}.pair-card{padding:35px;border:1px solid rgba(255,255,255,.1);border-radius:18px;background:#fff;box-shadow:0 25px 60px rgba(1,23,42,.24)}.pair-card.warm{background:#fffbf5}.pair-copy h3{margin:8px 0 14px;color:var(--navy-deep);font-size:31px}.pair-copy>p{margin:0 0 18px;color:#63798c;font-size:13px;line-height:1.8}.pair-copy ul{grid-template-columns:repeat(3,1fr);gap:9px}.pair-copy li{padding-left:15px;font-size:12px}.path-ui,.memory-ui{height:275px;margin-top:27px;padding:19px;border:1px solid #e1ebf3;border-radius:14px;background:#f8fbfe}.path-top,.memory-title{display:flex;align-items:center;justify-content:space-between;color:#71879a;font-size:12px}.path-top b{color:var(--blue)}.path-item{margin-top:11px;padding:12px;display:flex;align-items:center;gap:10px;border:1px solid #e5edf3;border-radius:10px;background:#fff}.path-item>i{width:31px;height:31px;display:grid;place-items:center;flex:0 0 auto;border-radius:8px;color:#6a879e;background:#eef4f8;font-style:normal;font-size:12px}.path-item p{flex:1;margin:0}.path-item b,.path-item span{display:block}.path-item b{color:#2e506d;font-size:12px}.path-item span{margin-top:4px;color:#8da0b0;font-size:12px}.path-item em{color:#9aadbc;font-size:12px;font-style:normal}.path-item.done>i{color:#fff;background:#53a9ea}.path-item.active{border-color:#f2d7b2;background:#fffaf3}.path-item.active>i{color:#fff;background:var(--orange)}.path-item.active em{color:var(--orange)}.memory-title b{color:#a16a2e}.curve{height:142px;margin-top:10px;position:relative;border-left:1px solid #e5ddcf;border-bottom:1px solid #e5ddcf;background:linear-gradient(180deg,transparent,rgba(243,154,47,.05))}.curve-line{position:absolute;left:5%;right:4%;top:22%;height:70px;border-top:3px solid var(--orange);border-radius:50%;transform:rotate(8deg)}.dot{position:absolute;width:10px;height:10px;border:3px solid #fff;border-radius:50%;background:var(--orange);box-shadow:0 0 0 1px var(--orange)}.d1{left:8%;top:24%}.d2{left:36%;top:38%}.d3{left:64%;top:48%}.d4{left:88%;top:59%}.day{position:absolute;bottom:8px;color:#9d8a73;font-size:12px}.t1{left:5%}.t2{left:34%}.t3{left:62%}.t4{left:86%}.review-tip{margin-top:11px;padding:10px;display:flex;align-items:center;gap:9px;border-radius:9px;background:#fff1dc}.review-tip>i{width:27px;height:27px;display:grid;place-items:center;color:#fff;border-radius:50%;background:var(--orange);font-style:normal;font-weight:800}.review-tip p{flex:1;margin:0}.review-tip b,.review-tip span{display:block}.review-tip b{color:#795225;font-size:12px}.review-tip span{margin-top:3px;color:#aa8d6a;font-size:12px}.review-tip button{padding:7px 8px;color:#fff;border:0;border-radius:5px;background:var(--orange);font-size:12px}
.companion{padding:110px 0;position:relative;overflow:hidden;background:#072e52}.companion-grid-bg{opacity:.48}.companion-layout{display:grid;grid-template-columns:1.05fr .95fr;gap:76px;align-items:center;position:relative}.companion-image{height:510px;position:relative;overflow:hidden;border:1px solid rgba(255,255,255,.13);border-radius:22px;background:#124a77;box-shadow:0 35px 90px rgba(0,17,32,.36)}.companion-image img{width:100%;height:100%;object-fit:cover}.image-overlay{position:absolute;inset:0;background:linear-gradient(180deg,rgba(5,43,76,.05),rgba(5,35,62,.5))}.vision-tag{position:absolute;padding:10px 13px;color:rgba(255,255,255,.65);border:1px solid rgba(255,255,255,.2);border-radius:8px;background:rgba(8,48,81,.72);backdrop-filter:blur(8px);font-size:12px}.vision-tag b{display:block;margin-top:3px;color:#fff;font-size:12px}.vision-tag.one{left:22px;top:32px}.vision-tag.two{right:22px;top:130px}.vision-tag.three{left:32px;bottom:31px}.light-index span{color:#6db7ef}.companion-copy h2{margin:9px 0 19px;color:#fff;font-size:44px}.companion-copy>p{margin:0;color:rgba(255,255,255,.66);font-size:15px;line-height:1.9}.companion-points{margin-top:32px;display:grid;gap:13px}.companion-points>div{padding:14px 16px;display:flex;align-items:center;gap:13px;border:1px solid rgba(255,255,255,.09);border-radius:11px;background:rgba(255,255,255,.055)}.companion-points i{width:36px;height:36px;display:grid;place-items:center;flex:0 0 auto;color:#fff;border-radius:9px;background:linear-gradient(135deg,#55aceb,#347fc4);font-style:normal;font-size:12px}.companion-points p{margin:0}.companion-points b,.companion-points span{display:block}.companion-points b{color:#fff;font-size:12px}.companion-points span{margin-top:4px;color:rgba(255,255,255,.46);font-size:12px}
.mistake-window{padding:22px;background:#f6fafd}.mistake-head{display:flex;align-items:center;justify-content:space-between}.mistake-head small,.mistake-head b{display:block}.mistake-head small{color:#91a4b5;font-size:12px}.mistake-head b{margin-top:4px;color:#34546f;font-size:13px}.mistake-head button{padding:9px 11px;color:#fff;border:0;border-radius:7px;background:var(--blue);font-size:12px}.mistake-body{margin-top:20px;display:grid;grid-template-columns:1.08fr .92fr;gap:14px}.paper{height:325px;padding:24px;position:relative;border-radius:9px;background:#fff;box-shadow:0 12px 30px rgba(28,77,116,.09)}.paper>span{color:#e28722;font-size:12px}.paper p{color:#344f66;font-size:12px;line-height:1.7}.formula{height:120px;display:grid;place-items:center;color:var(--navy);border:1px dashed #cdddea;border-radius:7px;background:#fafdff;font:700 24px Georgia,serif}.paper small{display:block;margin-top:15px;color:#e28722;font-size:12px}.knowledge{height:325px;padding:23px;border:1px solid #dce9f3;border-radius:10px;background:#fff}.knowledge>small{color:#4c92cc;font-size:12px}.knowledge>b{display:block;margin:13px 0 9px;color:#244966;font-size:14px}.knowledge>p{color:#7b8e9e;font-size:12px;line-height:1.7}.knowledge>div{display:flex;gap:6px;margin:22px 0}.knowledge>div span{padding:6px 7px;color:#3c7fb7;border-radius:5px;background:#edf7ff;font-size:12px}.knowledge button{width:100%;height:35px;color:#fff;border:0;border-radius:7px;background:linear-gradient(135deg,#4da0e5,#347fc4);font-size:12px}
.feynman-window{padding:22px;background:linear-gradient(180deg,#0f4775,#0a355b);color:#fff}.feynman-top{display:flex;align-items:center;color:rgba(255,255,255,.56);font-size:12px}.feynman-top b{margin-left:10px;color:#fff}.feynman-top em{margin-left:auto;color:#ffbd68;font-style:normal}.speaker{height:175px;display:flex;flex-direction:column;align-items:center;justify-content:center}.speaker-ring{width:92px;height:92px;display:grid;place-items:center;border:1px solid rgba(105,190,251,.3);border-radius:50%;box-shadow:0 0 0 12px rgba(94,180,245,.08),0 0 0 24px rgba(94,180,245,.04)}.speaker-ring i{width:58px;height:58px;display:grid;place-items:center;border-radius:50%;background:linear-gradient(135deg,#65b9f6,#347fc4);font-style:normal;font-size:21px;font-weight:800}.speaker>span{margin-top:25px;color:rgba(255,255,255,.6);font-size:12px}.wave.large{height:45px}.wave.large i{background:linear-gradient(180deg,#63b8f5,#f3a14a)}.score-row{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.score-row>div{padding:10px;text-align:center;border:1px solid rgba(255,255,255,.08);border-radius:8px;background:rgba(255,255,255,.06)}.score-row b,.score-row span{display:block}.score-row b{color:#ffbb62;font-size:18px}.score-row span{margin-top:3px;color:rgba(255,255,255,.46);font-size:12px}.ai-comment{margin-top:13px;padding:11px;display:flex;align-items:center;gap:9px;border-radius:9px;background:rgba(255,255,255,.07)}.ai-comment>i{width:30px;height:30px;display:grid;place-items:center;border-radius:8px;background:var(--orange);font-style:normal;font-size:12px}.ai-comment p{margin:0}.ai-comment b,.ai-comment span{display:block}.ai-comment b{font-size:12px}.ai-comment span{margin-top:3px;color:rgba(255,255,255,.48);font-size:12px}
.planning-section{padding:110px 0;background:linear-gradient(180deg,#fff,#f7fbfe)}.planning-grid{margin-top:48px;display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.planning-grid>article{padding:27px 24px 24px;border:1px solid #e0ebf3;border-radius:17px;background:#fff;box-shadow:0 18px 50px rgba(31,79,119,.08)}.planning-grid>article.warm{background:#fffbf5}.planning-grid article h3{margin:8px 0 12px;color:var(--navy-deep);font-size:26px}.planning-grid article>p{height:65px;margin:0;color:#718497;font-size:12px;line-height:1.75}.schedule-ui,.question-ui,.report-ui{height:285px;margin:20px 0;padding:16px;border:1px solid #e2ebf2;border-radius:12px;background:#f8fbfe}.schedule-head{display:flex;justify-content:space-between;color:#345773;font-size:12px}.schedule-head span{color:#4d8ec4}.time-line{margin-top:13px;display:flex;gap:10px}.time-line>i{width:38px;padding-top:8px;color:#8da0b1;font-size:12px;font-style:normal}.time-line p{flex:1;margin:0;padding:9px;border-left:3px solid #a6ccea;border-radius:0 7px 7px 0;background:#fff}.time-line b,.time-line span{display:block}.time-line b{color:#31526c;font-size:12px}.time-line span{margin-top:3px;color:#9aaab7;font-size:12px}.time-line.active p{border-color:var(--orange);background:#fff8ef}.question-ui{position:relative;background:linear-gradient(145deg,#fffaf3,#fff)}.q-core{position:absolute;left:50%;top:42%;width:58px;height:58px;display:grid;place-items:center;transform:translate(-50%,-50%);color:#fff;border-radius:50%;background:var(--orange);box-shadow:0 0 0 9px rgba(243,154,47,.1);font-size:20px;font-weight:800}.q-node{position:absolute;padding:7px 9px;color:#52728c;border:1px solid #dce8f1;border-radius:7px;background:#fff;font-size:12px}.n1{left:18px;top:49px}.n2{right:18px;top:49px}.n3{left:24px;top:128px}.n4{right:20px;top:128px}.q-result{position:absolute;left:16px;right:16px;bottom:15px;padding:12px 14px;border-radius:9px;background:#0e416d}.q-result small,.q-result b,.q-result span{display:block}.q-result small{color:#6eb7ef;font-size:12px}.q-result b{margin-top:3px;color:#fff;font-size:12px}.q-result span{margin-top:3px;color:rgba(255,255,255,.5);font-size:12px}.report-head{display:flex;align-items:center;justify-content:space-between;color:#385a75;font-size:12px}.report-head b{color:#8aa0b2}.metric-row{margin-top:14px;display:grid;grid-template-columns:repeat(3,1fr);gap:6px}.metric-row>div{padding:10px 6px;text-align:center;border-radius:8px;background:#fff}.metric-row b,.metric-row span{display:block}.metric-row b{color:var(--blue);font-size:15px}.metric-row span{margin-top:3px;color:#95a7b5;font-size:12px}.chart-bars{height:100px;margin-top:13px;padding:7px 8px 0;display:flex;align-items:flex-end;gap:8px;border-bottom:1px solid #dce8f1}.chart-bars i{flex:1;height:var(--h);border-radius:4px 4px 0 0;background:linear-gradient(180deg,#61b4f2,#347fc4)}.chart-bars i:nth-child(6),.chart-bars i:nth-child(7){background:linear-gradient(180deg,#ffbb62,#f39a2f)}.report-tip{margin-top:13px;display:flex;align-items:center;gap:8px}.report-tip i{width:27px;height:27px;display:grid;place-items:center;flex:0 0 auto;color:#fff;border-radius:7px;background:var(--blue);font-size:12px;font-style:normal}.report-tip span{color:#71889b;font-size:12px;line-height:1.5}.planning-grid article>ul{gap:8px}.planning-grid article>ul li{font-size:12px}
.feature-cloud{padding:105px 0 90px;position:relative;overflow:hidden;background:linear-gradient(145deg,#0d426f,#062d51)}.cloud-grid{opacity:.4}.feature-cloud>.wrap{position:relative}.chips{margin:44px auto 0;max-width:1060px;display:flex;flex-wrap:wrap;justify-content:center;gap:10px}.chips span{padding:12px 16px;color:rgba(255,255,255,.7);border:1px solid rgba(255,255,255,.1);border-radius:8px;background:rgba(255,255,255,.06);font-size:12px}.chips span:nth-child(3n+1){border-color:rgba(94,182,247,.25);background:rgba(71,163,231,.1)}.chips span:nth-child(4n){border-color:rgba(243,154,47,.22);background:rgba(243,154,47,.08)}.coming{margin-top:50px;padding:23px 26px;display:flex;align-items:center;gap:16px;border:1px solid rgba(255,255,255,.12);border-radius:14px;background:rgba(255,255,255,.07)}.coming>span{width:48px;height:48px;display:grid;place-items:center;color:#fff;border-radius:12px;background:linear-gradient(135deg,#5bb1f2,#347fc4);font-weight:800}.coming div{flex:1}.coming small,.coming b{display:block}.coming small{color:#6eb8f0;font-size:12px;letter-spacing:1px}.coming b{margin-top:5px;color:#fff;font-size:15px}.coming a{padding:12px 16px;color:#fff;border-radius:7px;background:var(--orange);font-size:12px;font-weight:700}
footer{padding-top:60px;color:rgba(255,255,255,.53);background:#052642}.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr .7fr;gap:50px;padding-bottom:40px}.footer-brand>div{width:236px;height:42px;overflow:hidden;border-radius:4px;background:#fff}.footer-brand img{width:226px;height:42px;object-fit:cover}.footer-brand p{margin:18px 0 0;font-size:12px;line-height:1.8}.footer-grid h4{margin:0 0 17px;color:#fff;font-size:12px}.footer-grid>div>span{display:block;margin-top:11px;font-size:12px}.footer-qr{display:flex;flex-direction:column;align-items:center}.footer-qr i{width:82px;height:82px;display:grid;place-items:center;text-align:center;border:6px solid #fff;color:#7e91a1;background:repeating-linear-gradient(45deg,#eef3f6 0 4px,#cbd6de 4px 8px);font-size:12px;font-style:normal}.copyright{height:58px;display:flex;align-items:center;justify-content:space-between;border-top:1px solid rgba(255,255,255,.08);font-size:12px}
.demo-video{overflow:hidden;border:1px solid rgba(68,145,205,.19);border-radius:20px;background:#071f38;box-shadow:0 28px 78px rgba(11,56,91,.22)}
.product-demo-video{width:100%;aspect-ratio:16/9;display:block;object-fit:contain;background:#061b31}
.video-stage{height:390px;position:relative;overflow:hidden;color:#fff;background:linear-gradient(145deg,#0f4b79,#062d51)}
.video-stage::before{content:"";position:absolute;inset:0;opacity:.55;background-image:linear-gradient(rgba(109,190,249,.08) 1px,transparent 1px),linear-gradient(90deg,rgba(109,190,249,.08) 1px,transparent 1px);background-size:38px 38px}
.video-stage::after{content:"";position:absolute;width:360px;height:360px;right:-70px;top:-130px;border:1px solid rgba(112,195,251,.24);border-radius:50%;box-shadow:0 0 0 44px rgba(87,177,240,.055),0 0 0 88px rgba(87,177,240,.035)}
.stage-tag{position:absolute;left:28px;top:26px;z-index:4;padding:7px 10px;color:#8fd0ff;border:1px solid rgba(127,205,255,.2);border-radius:6px;background:rgba(7,44,75,.42);font-size:12px;font-weight:700;letter-spacing:1.5px}
.stage-emblem{position:absolute;right:62px;top:72px;z-index:3;width:108px;height:108px;display:grid;place-items:center;color:#fff;border:1px solid rgba(255,255,255,.27);border-radius:50%;background:linear-gradient(135deg,#6bc1fb,#2878b8);box-shadow:0 0 0 15px rgba(93,183,245,.1),0 18px 40px rgba(1,24,43,.25);font-size:36px;font-weight:800}
.stage-copy{position:absolute;left:30px;bottom:30px;z-index:4}.stage-copy small,.stage-copy b,.stage-copy span{display:block}.stage-copy small{color:#83c6f4;letter-spacing:1px}.stage-copy b{margin-top:7px;color:#fff;font-size:24px}.stage-copy span{margin-top:8px;color:rgba(255,255,255,.63);font-size:13px}
.center-play{position:absolute;left:50%;top:50%;z-index:6;width:72px;height:72px;display:grid;place-items:center;transform:translate(-50%,-50%);padding-left:5px;color:var(--navy-deep);border:0;border-radius:50%;background:rgba(255,255,255,.96);box-shadow:0 0 0 12px rgba(255,255,255,.12),0 15px 36px rgba(0,24,43,.25);font-size:22px;cursor:pointer}
.video-controlbar{height:54px;padding:0 18px;display:flex;align-items:center;gap:12px;color:rgba(255,255,255,.74);background:#061b31;font-size:12px}.video-controlbar button{width:28px;height:28px;padding:0;color:#fff;border:0;background:transparent;font-size:12px}.video-controlbar>i{height:4px;display:block;flex:1;overflow:hidden;border-radius:4px;background:rgba(255,255,255,.16)}.video-controlbar>i b{display:block;width:16%;height:100%;border-radius:4px;background:linear-gradient(90deg,var(--orange),#ffc16b)}
.replace-note{height:58px;padding:0 18px;display:flex;align-items:center;justify-content:space-between;color:#7890a5;background:#fff;font-size:12px}.replace-note span{padding:6px 9px;color:#b26a1d;border-radius:5px;background:#fff1df;font-weight:700}.replace-note b{color:#536f85;font-size:12px;font-weight:500}
.visual-micro .video-stage{background:linear-gradient(145deg,#0a3c68,#0a2d50 68%,#784814)}.visual-micro .stage-emblem{background:linear-gradient(135deg,#ffc36c,#ef8f25)}
.visual-test .video-stage{background:linear-gradient(145deg,#0c456e,#063253 68%,#174f7a)}.visual-test .stage-emblem{clip-path:polygon(50% 0,95% 32%,78% 92%,22% 92%,5% 32%);border-radius:0}
.visual-guide .video-stage{background:linear-gradient(145deg,#104e7e,#073153 70%,#345e79)}.visual-guide .stage-emblem{background:linear-gradient(135deg,#5fb8f5,#317fc0)}
.visual-memory .video-stage{background:linear-gradient(145deg,#6d471d,#123f61 72%,#082b4d)}.visual-memory .stage-emblem{background:linear-gradient(135deg,#ffbf65,#ed8d23)}
.visual-mistake .video-stage{background:linear-gradient(145deg,#104c79,#073052 65%,#4d6f82)}.visual-mistake .stage-emblem{background:linear-gradient(135deg,#5eb5f3,#f0a043)}
.photo-stage img{width:100%;height:100%;object-fit:cover}.photo-stage::before{z-index:2;opacity:1;background:linear-gradient(90deg,rgba(5,38,65,.88),rgba(5,38,65,.22) 62%,rgba(5,38,65,.38))}.photo-stage::after{z-index:2}.photo-stage .stage-emblem,.photo-stage .stage-tag,.photo-stage .stage-copy,.photo-stage .center-play{z-index:4}.dark-player{border-color:rgba(255,255,255,.14);box-shadow:0 32px 80px rgba(0,18,33,.36)}
.guided-module{background:linear-gradient(180deg,#f7fbff,#fff)}.memory-module{background:#fffaf3}.guided-module .module-copy,.memory-module .module-copy{max-width:470px}
@media(min-width:901px){.module-layout.reverse .demo-video{grid-row:1;grid-column:1}}
.module{padding:112px 0}.module-layout{gap:90px}.module-copy li{font-size:14px}.module-index span,.module-tag{font-size:12px}.flow span{font-size:12px}.data-note strong{font-size:14px}.data-note span{font-size:12px}
.planning-grid article>p{height:78px;font-size:13px}.schedule-ui,.question-ui,.report-ui{height:315px}.planning-grid article>ul li{font-size:12px}.footer-brand p,.footer-grid>div>span,.copyright{font-size:12px}
.footer-brand>div{width:221px;height:56px;border-radius:0;background:transparent}.footer-brand img{width:221px;height:56px;object-fit:contain}.footer-qr img{display:block;width:82px;height:82px;border:6px solid #fff;object-fit:cover;background:#fff}
@media(max-width:900px){.main-nav{display:none}.nav-wrap{justify-content:space-between}.hero{height:auto}.hero-layout{height:auto;padding:70px 0;grid-template-columns:1fr}.hero-stats{grid-template-columns:1fr 1fr;height:auto;padding:20px}.hero-stats>div{min-height:90px}.module-layout,.module-layout.reverse,.companion-layout{grid-template-columns:1fr}.module-layout.reverse .module-copy,.module-layout.reverse .product-window,.module-layout.reverse .demo-video{grid-column:auto;grid-row:auto}.pair-grid,.planning-grid{grid-template-columns:1fr}.companion-image{height:430px}.video-stage{height:330px}.module{padding:78px 0}} 

/* AI 精准教学首屏：采用合作加盟页的通屏场景图与底部优势栏结构 */
.hero{height:720px;overflow:hidden;background:#f7fbfe}
.hero::before{content:none}
.hero-image{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:center}
.hero-overlay{position:absolute;inset:0;z-index:1;background:linear-gradient(90deg,rgba(248,252,255,.99) 0%,rgba(248,252,255,.96) 34%,rgba(248,252,255,.55) 52%,rgba(5,39,67,.05) 100%)}
.hero>.hero-grid{z-index:2;opacity:1;mask-image:linear-gradient(90deg,#000,transparent 62%);background-image:linear-gradient(rgba(53,137,198,.07) 1px,transparent 1px),linear-gradient(90deg,rgba(53,137,198,.07) 1px,transparent 1px)}
.hero-layout{height:auto;display:block;padding-top:94px;position:relative;z-index:3}
.hero-copy{width:560px;padding:0}
.eyebrow{display:block;width:auto;padding:0;border:0;border-radius:0;color:var(--blue);background:transparent;font-size:12px;font-weight:800;letter-spacing:2.6px}
.hero-kicker,.hero-copy>.hero-kicker{margin:19px 0 7px;color:#39769f;font-size:18px;font-weight:700;line-height:1.5}
.hero h1{margin:0;color:var(--navy-deep);font-size:58px;line-height:1.16;letter-spacing:-2.6px}
.hero h1 em{color:var(--orange);font-style:normal;font-weight:700}
.hero-copy>p:not(.hero-kicker){max-width:525px;margin:24px 0 0;color:#5f788d;font-size:17px;line-height:1.9}
.primary-btn{min-height:52px;margin-top:31px;padding:0 22px;gap:20px;border-radius:8px;font-size:15px;transition:transform .2s ease,box-shadow .2s ease}
.primary-btn:hover{transform:translateY(-2px);box-shadow:0 16px 32px rgba(240,141,31,.3)}
.hero-features{position:absolute;z-index:4;left:50%;bottom:0;width:min(1200px,calc(100% - 48px));height:118px;padding:0 40px;display:grid;grid-template-columns:repeat(3,1fr);gap:30px;transform:translateX(-50%);border:1px solid rgba(55,139,199,.15);border-bottom:0;border-radius:18px 18px 0 0;background:rgba(255,255,255,.92);box-shadow:0 -20px 52px rgba(15,72,111,.08);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px)}
.hero-features article{display:flex;align-items:center;gap:15px}
.hero-features article+article{padding-left:30px;border-left:1px solid #e1ebf2}
.hero-features i{color:rgba(48,132,195,.2);font-size:34px;font-style:normal;font-weight:900}
.hero-features b{color:var(--navy);font-size:20px;white-space:nowrap}
.hero-features span{margin-left:auto;color:#71889a;font-size:12px;line-height:1.6;text-align:right}

@media(max-width:1000px){
  .hero{height:680px}
  .hero-image{object-position:58% center}
  .hero-overlay{background:linear-gradient(90deg,rgba(248,252,255,.99),rgba(248,252,255,.94) 48%,rgba(248,252,255,.25) 82%)}
  .hero h1{font-size:50px}
  .hero-features span{display:none}
}
@media(max-width:700px){
  .hero{height:650px;padding:0}
  .hero-image{object-position:68% center}
  .hero-overlay{background:linear-gradient(90deg,rgba(248,252,255,.99),rgba(248,252,255,.92) 73%,rgba(248,252,255,.42))}
  .hero-layout{padding:72px 0 0}
  .hero-copy{width:100%}
  .hero h1{font-size:40px;letter-spacing:-1.5px}
  .hero-copy>p:not(.hero-kicker){max-width:94%;font-size:15px}
  .hero-features{width:min(100% - 28px,1200px);height:105px;padding:0 14px;gap:7px}
  .hero-features article{display:block;text-align:center}
  .hero-features article+article{padding-left:7px}
  .hero-features i{display:block;font-size:23px}
  .hero-features b{display:block;font-size:16px}
}

/* 手机端首屏与 AI 学伴师顺序优化；桌面端保持原双栏结构。 */
@media(max-width:700px){
  .hero{height:445px}
  .hero-image{object-position:87% center}
  .hero-overlay{background:linear-gradient(90deg,rgba(248,252,255,.99) 0%,rgba(248,252,255,.94) 54%,rgba(248,252,255,.48) 78%,rgba(248,252,255,.16) 100%)}
  .hero-layout{padding-top:58px}
  .hero h1{font-size:38px;line-height:1.18}
  .hero-copy>p:not(.hero-kicker){max-width:89%;margin-top:19px;font-size:14px;line-height:1.78}
  .primary-btn{min-height:49px;margin-top:23px}
  .hero-features{display:none}
  .hero + .module{padding-top:40px}

  .companion{padding:82px 0}
  .companion-layout{gap:30px}
  .companion-copy{order:1}
  .companion-layout>.demo-video{order:2;margin-top:4px;border-radius:16px;box-shadow:0 22px 58px rgba(0,18,33,.3)}
  .companion-copy h2{font-size:38px}
  .companion-copy>p{font-size:14px;line-height:1.85}
  .companion-points{margin-top:24px}
}