*{box-sizing:border-box}html,body{margin:0;height:100%}
body{
  font-family:-apple-system,"PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  color:#1f2937;
  background-color:#eef2f7;
  background-image:
    linear-gradient(rgba(148,163,184,.11) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148,163,184,.11) 1px, transparent 1px);
  background-size:28px 28px;
  background-attachment:fixed;
}
a{color:inherit;text-decoration:none}
.ico,.catIco{display:inline-block;vertical-align:-3px;flex:none}
.top{position:sticky;top:0;z-index:10;height:60px;display:flex;align-items:center;gap:24px;padding:0 20px;background:rgba(255,255,255,.92);backdrop-filter:blur(8px);border-bottom:1px solid #e5e9f0}
.brand{display:flex;align-items:center;gap:10px;font-weight:600;font-size:21px;letter-spacing:.01em;white-space:nowrap;color:#0f172a}
.logo{width:36px;height:36px;border-radius:10px;display:block;flex:none;box-shadow:0 3px 12px rgba(34,211,238,.45)}.logo svg{display:block}
.nav{display:flex;gap:2px;flex:1;overflow-x:auto;align-items:stretch;height:100%}
.nav a,.nav span{display:inline-flex;align-items:center;padding:0 14px;font-size:15px;color:#64748b;white-space:nowrap;border-bottom:3px solid transparent;border-radius:0;height:100%}
.nav a:hover{color:#0f172a;background:#f8fafc}
.nav a.on{color:#047857;font-weight:700;background:linear-gradient(180deg,#ecfdf5 0%,rgba(236,253,245,.35) 100%);border-bottom-color:#10b981}
.soon{color:#94a3b8!important;cursor:not-allowed}.soon i,.tag{font-style:normal;font-size:11px;background:#f1f5f9;color:#94a3b8;border-radius:6px;padding:1px 6px;margin-left:4px}
.right{display:flex;gap:8px}.btn{border:1px solid #d1d5db;background:#fff;border-radius:8px;padding:7px 14px;font-size:14px;cursor:pointer}
.btn.primary{background:#10b981;border-color:#10b981;color:#fff;box-shadow:0 1px 2px rgba(16,185,129,.25)}.btn[disabled]{opacity:.55;cursor:not-allowed}
.menuBtn{display:none;border:0;background:none;padding:6px;cursor:pointer;color:#475569;border-radius:8px}.menuBtn:hover{background:#f1f5f9}.menuBtn svg{display:block}
.layout{display:flex;min-height:calc(100vh - 60px)}
.side{width:240px;flex:none;background:rgba(255,255,255,.88);backdrop-filter:blur(6px);border-right:1px solid #e5e9f0;padding:16px 12px;overflow-y:auto}
.side h4{margin:16px 10px 8px;font-size:11px;color:#94a3b8;font-weight:700;letter-spacing:.08em;text-transform:uppercase}
.side h4:first-child{margin-top:4px}
.cat{display:flex;align-items:center;gap:8px;padding:9px 10px;border-radius:10px;font-weight:700;font-size:14.5px;cursor:pointer;color:#0f172a}
.cat:hover{background:#f1f5f9}.cat.on{background:#ecfdf5;color:#047857}
.cat .n{margin-left:auto;font-size:11px;color:#94a3b8;font-weight:500;background:#f8fafc;border-radius:999px;padding:1px 8px}
.cat.on .n{background:#d1fae5;color:#047857}
.cat>a{flex:1;display:flex;align-items:center;gap:8px;min-width:0}
.sub{margin:2px 0 6px 28px}.sub a{display:block;padding:6px 10px;border-radius:7px;font-size:13.5px;color:#64748b;font-weight:400}
.sub a:hover{background:#f8fafc;color:#334155}.sub a.on{color:#047857;background:#f0fdf4;font-weight:600}
.main{flex:1;min-width:0}.page{padding:14px 32px 28px 16px;max-width:1180px;margin:0 auto 0 0}
.hero{border-radius:22px;padding:44px 40px;background:linear-gradient(125deg,#ecfdf5 0%,#e0f2fe 55%,#fef9c3 100%);display:flex;gap:30px;align-items:center;border:1px solid rgba(255,255,255,.7);box-shadow:0 10px 40px rgba(15,23,42,.06)}
.hero h1{font-size:44px;margin:0 0 12px;letter-spacing:0;color:#0f172a;font-weight:400}.hero p{color:#475569;font-size:16px;line-height:1.7;margin:0 0 22px;max-width:560px}
.hero .art{margin-left:auto;opacity:.92;flex:none}.hero .art svg{display:block;filter:drop-shadow(0 8px 16px rgba(14,165,233,.2))}
.hero .btns{display:flex;gap:10px;flex-wrap:wrap}
h2.sec{font-size:18px;margin:36px 0 14px;display:flex;align-items:center;gap:10px;font-weight:800;color:#0f172a;letter-spacing:-.01em}
h2.sec .secIco{width:28px;height:28px;border-radius:8px;display:grid;place-items:center;background:#fff;border:1px solid #e5e9f0;box-shadow:0 1px 2px #0001}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:18px}
.card{background:#fff;border:1px solid #e5e9f0;border-radius:16px;padding:0;display:flex;flex-direction:column;overflow:hidden;transition:transform .18s ease,box-shadow .18s ease;box-shadow:0 1px 2px rgba(15,23,42,.04)}
a.card:hover{box-shadow:0 14px 32px rgba(15,23,42,.1);transform:translateY(-4px)}
.card .cover{padding:22px 18px 18px;background:linear-gradient(145deg,var(--tint,#f0fdf4),#fff);border-bottom:1px solid #f1f5f9;min-height:112px;display:flex;flex-direction:column;justify-content:flex-end;position:relative}
.card .cover::after{content:"";position:absolute;top:12px;right:14px;width:36px;height:36px;border-radius:10px;background:rgba(255,255,255,.7);display:grid;place-items:center}
.card .fn{font-size:28px;font-weight:800;letter-spacing:-.03em;color:var(--accent,#047857);line-height:1.1;font-family:ui-sans-serif,system-ui,"Segoe UI",sans-serif}
.card .sell{margin-top:8px;font-size:13px;color:#64748b;line-height:1.4;font-weight:500}
.card .cardBody{padding:14px 16px 16px;display:flex;flex-direction:column;gap:6px}
.card b{font-size:15px;font-weight:700;color:#0f172a}.card small{color:#64748b;line-height:1.45;font-size:12.5px;font-weight:400}
.card .meta{font-size:12px;color:#10b981;font-weight:600;margin-top:2px}
.card .ic{width:44px;height:44px;border-radius:12px;display:grid;place-items:center;background:#f0fdf4;margin:16px 16px 0}
.card.plain{padding:18px}.card.plain .ic{margin:0}
.card.dim{opacity:.72}
.card.collCard{cursor:default}.card.collCard .cover{min-height:88px}
.empty{background:rgba(255,255,255,.9);border:1px dashed #cbd5e1;border-radius:16px;padding:56px 20px;text-align:center;color:#64748b}
.empty .big{margin-bottom:8px}.empty h3{color:#0f172a;margin:10px 0 6px;font-size:18px}
.frameWrap{height:calc(100vh - 60px);display:flex;flex-direction:column}
.crumb{padding:10px 20px;font-size:13px;color:#64748b;background:rgba(255,255,255,.92);border-bottom:1px solid #eef1f5}.crumb a{color:#047857;font-weight:600}
.frameWrap iframe{flex:1;border:0;width:100%;background:#fff}
.about{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.about .card{padding:18px}.about .card p{margin:4px 0;color:#475569;font-size:13.5px}
@media(max-width:900px){
 .menuBtn{display:block}.right .btn:not(.primary){display:none}
 .side{position:fixed;top:96px;bottom:0;left:0;z-index:9;transform:translateX(-100%);transition:.2s;box-shadow:4px 0 20px rgba(0,0,0,.08)}
 body.sideOpen .side{transform:none}
 .top{gap:10px;padding:0 12px}.brand span{display:none}.nav a,.nav span{padding:0 9px;font-size:14px}
 .page{padding:16px}.hero{padding:26px 20px}.hero h1{font-size:28px}.hero .art{display:none}.about{grid-template-columns:1fr}
 .frameWrap{height:auto}.frameWrap iframe{height:1500px;flex:none}
 .card .fn{font-size:24px}
}
/* 课程/管理页：侧边栏收起 */
body.wide .menuBtn{display:block}
body.wide .side{position:fixed;top:60px;bottom:0;left:0;z-index:9;transform:translateX(-100%);transition:.2s;box-shadow:4px 0 20px rgba(0,0,0,.08)}
body.wide.sideOpen .side{transform:none}
@media(max-width:900px){
 .top{flex-wrap:wrap;height:auto;padding:8px 12px;row-gap:4px}.nav{order:3;flex-basis:100%;height:40px}
 .side,body.wide .side{top:96px}.layout{min-height:auto}.right{margin-left:auto}
}
/* 分类 > 合集 > 课程 树 */
.cat .tw{width:16px;color:#94a3b8;font-size:12px;cursor:pointer;flex:none;text-align:center}
.tnode.shut>.kids{display:none}
.coll{margin:2px 0 0 26px;padding:6px 8px;font-size:13px;color:#0f172a;font-weight:700;cursor:pointer;border-radius:7px;user-select:none;display:flex;align-items:center;gap:6px}
.coll:hover{background:#f8fafc}
.kids .sub{margin-left:40px}.sub .none{display:block;font-size:12px;color:#cbd5e1;padding:4px 10px}
.csec{font-size:17px;margin:26px 0 4px;display:flex;align-items:center;gap:10px;font-weight:800;color:#0f172a}
.cdesc{color:#64748b;font-size:13px;margin:0 0 12px;font-weight:400}
.tch{font-size:12px;font-weight:600;background:#ecfdf5;color:#047857;border-radius:6px;padding:2px 8px;margin-left:8px}
/* 单词本 */
.wbBar{display:flex;align-items:center;gap:14px;margin:6px 0 12px;flex-wrap:wrap}.wbTabs button{padding:6px 14px;border:1px solid #bae6fd;background:#fff;border-radius:999px;margin-right:6px;cursor:pointer;font-weight:600;color:#0369a1}
.wbTabs button.on{background:#0284c8;color:#fff;border-color:#0284c8}.wbCount{color:#64748b;font-size:13px}
.wbList{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:10px}
.wbItem{display:flex;align-items:center;gap:10px;background:#fff;border:1px solid #e2e8f0;border-left:5px solid #7dd3fc;border-radius:12px;padding:10px 12px}
.wbItem.fav{border-left-color:#f59e0b;background:#fffbeb}.wbText{flex:1;display:flex;flex-direction:column;min-width:0}.wbText b{font-size:17px;color:#0c4a6e}.wbText span{color:#334155;font-size:14px}
.wbText small{font-size:12px;color:#94a3b8;margin-top:2px}.wbText small a{color:#0284c8}
.wbPlay{width:38px;height:38px;border-radius:50%;border:none;background:#e0f2fe;cursor:pointer;font-size:17px}.wbPlay:hover{background:#bae6fd}
.wbStar{border:none;background:none;font-size:24px;color:#f59e0b;cursor:pointer}
.side a.wbLink{font-weight:600}

/* Easyway Lab 品牌字体：细体，系统字体栈（离线 file:// 可用） */
:root{--brandFont:"Segoe UI",-apple-system,BlinkMacSystemFont,"Helvetica Neue","PingFang SC","Microsoft YaHei",system-ui,sans-serif}
.brandT,.hero h1,h2.sec,h3.csec,.empty h3{font-family:var(--brandFont);font-weight:400}
.brand .brandT{font-weight:600}.brand .brandT em{font-weight:600}
.brandT em,.hero h1 em{font-style:normal;background:linear-gradient(90deg,#06b6d4,#6366f1);-webkit-background-clip:text;background-clip:text;color:transparent;font-weight:400}
h2.sec{letter-spacing:.01em;font-weight:400}
@media(max-width:900px){.brand span.logo{display:block}}
/* 课程卡片动画封面 */
.card .cover.anim{padding:0;min-height:0;height:124px;justify-content:flex-start}
.card .cover.anim::after{display:none}
.card .cover.anim canvas{position:absolute;inset:0;width:100%;height:100%;display:block}
.card .cover.anim .fn{position:relative;z-index:1;margin:10px 0 0 12px;font-size:15px;font-family:var(--brandFont);font-weight:400;letter-spacing:.02em;opacity:.9}
.card .cardBody .sell{font-size:14px;color:#334155;font-weight:500;line-height:1.45}

/* 菜单栏配色：顶部每个标签一种颜色；左侧每个课程分类用自己的主题色（--tone / --tint 由 site.js 按分类写入） */
.tnode>.cat{border-left:3px solid transparent}
.tnode>.cat:hover{background:var(--tint,#f1f5f9)}
.tnode>.cat.on{background:var(--tint,#ecfdf5);color:var(--tone,#047857);border-left-color:var(--tone,#10b981)}
.tnode>.cat.on .n{background:#fff;color:var(--tone,#047857)}
.tnode .sub a:hover{color:var(--tone,#334155)}
.tnode .sub a.on{color:var(--tone,#047857);background:var(--tint,#f0fdf4)}

/* AI 课卡片：深色动画上的课程名用浅色发光字 */
.cover.anim.dark .fn{color:#1e3a6e!important;text-shadow:none}

/* sidebar: first 5 lessons per collection, '...' row expands the rest */
.sub a.moreLink{color:#94a3b8;font-size:12.5px;letter-spacing:.05em}.sub a.moreLink:hover{color:var(--tone,#334155)}

/* sidebar: no caret symbols */
.cat .tw{display:none}

/* 1016 top nav: tabs start right of the sidebar divider, equal width; subscribe grey, not clickable */
@media(min-width:900px){.brand{min-width:236px}}
.nav a,.nav span{flex:0 0 96px;justify-content:center;padding:0 6px}
.soonItem{color:#94a3b8!important;cursor:default!important;pointer-events:none;user-select:none}
.about .soonItem b{color:#94a3b8}

/* about page: slimmer banner (~60% height) */
.hero.heroSlim{padding:18px 28px}.hero.heroSlim h1{font-size:30px;margin:0 0 6px}.hero.heroSlim p{margin:0}

/* subscribe: clickable for a toast hint, still grey */
.soonItem{pointer-events:auto!important}
#ewToast{position:fixed;left:50%;top:76px;transform:translate(-50%,-8px);background:rgba(15,23,42,.88);color:#fff;font-size:14px;padding:9px 18px;border-radius:999px;box-shadow:0 6px 20px rgba(15,23,42,.2);opacity:0;pointer-events:none;transition:opacity .2s,transform .2s;z-index:50}
#ewToast.show{opacity:1;transform:translate(-50%,0)}

/* left menu open: transparent mask closes it on outside click (blocks clicks to the lesson underneath) */
#sideMask{display:none;position:fixed;left:0;right:0;top:60px;bottom:0;z-index:8;background:rgba(15,23,42,.06)}
body.sideOpen #sideMask{display:block}

/* 1016 cards uniform: all course cards same cover/text ratio, no glow, one-line title + first text line */
.card .cover.anim{height:124px;min-height:124px;box-sizing:border-box}
.card .cover.anim .fn{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:calc(100% - 24px);text-shadow:none}
.card .cardBody .sell{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;min-width:0}
.card .cardBody{min-width:0}
.courseGridFold>.card[hidden]{display:none!important}
.courseExpand{display:flex;align-items:center;justify-content:center;gap:14px;width:min(320px,100%);min-height:52px;margin:26px auto 36px;padding:14px 28px;border:1px solid #b9d9f5;border-radius:14px;background:linear-gradient(180deg,#fff,#edf6ff);color:#2563a6;font-family:inherit;font-size:16px;font-weight:600;line-height:1.5;letter-spacing:.06em;box-shadow:0 4px 12px rgba(37,99,166,.08),inset 0 1px 0 #fff;cursor:pointer;transition:background .18s,border-color .18s,box-shadow .18s,transform .18s}
.courseExpand::after{content:'';width:8px;height:8px;border-right:2px solid currentColor;border-bottom:2px solid currentColor;transform:translateY(-2px) rotate(45deg);transition:transform .18s}
.courseExpand[aria-expanded=true]::after{transform:translateY(2px) rotate(225deg)}
.courseExpand[hidden]{display:none}
.courseExpand:hover{border-color:#7bb8ed;background:linear-gradient(180deg,#f8fcff,#e1efff);color:#1d4f91;box-shadow:0 7px 18px rgba(37,99,166,.13);transform:translateY(-1px)}
.courseExpand:active{transform:translateY(0);box-shadow:0 2px 6px rgba(37,99,166,.1)}
.courseExpand:focus-visible{outline:2px solid #0284c7;outline-offset:3px}
@media(prefers-reduced-motion:reduce){.courseExpand,.courseExpand::after{transition:none}.courseExpand:hover{transform:none}}

/* 1017 about: subscribe card links to payment.html */
.about a.subCard{display:block;text-decoration:none;color:inherit;cursor:pointer;transition:border-color .15s,box-shadow .15s,transform .15s}.about a.subCard:hover{border-color:#c7d2fe;box-shadow:0 10px 24px -14px rgba(79,70,229,.45);transform:translateY(-2px)}.about a.subCard b{color:#1e1b4b}.about a.subCard p{margin:6px 0 0;font-size:13.5px}