/* 单词蛇大作战 · 官网
   风格：教育为骨、游戏为皮。浅色为底，对齐客户端游戏内的蓝黄配色（蓝主色 + 橙黄按钮）。
   单文件样式表，无外部依赖，可直接部署到静态服务器。 */

:root{
  --ink:#12203a;
  --ink-2:#35476d;
  --ink-3:#5a6d92;
  --brand:#2f6fe0;
  --brand-d:#1d54bc;
  --brand-l:#e9f2ff;
  --accent:#ea6000;
  --accent-l:#fff2e6;
  --ok:#0a8055;
  --ok-l:#e8f5ee;
  --bg:#eef4ff;
  --card:#ffffff;
  --line:#dde8fb;
  --radius:18px;
  --radius-lg:26px;
  --shadow-sm:0 1px 2px rgba(18,40,90,.05),0 2px 8px rgba(18,40,90,.04);
  --shadow-md:0 2px 6px rgba(18,40,90,.05),0 12px 32px rgba(18,40,90,.08);
  --shadow-lg:0 8px 24px rgba(18,40,90,.08),0 28px 60px rgba(18,40,90,.10);
  --maxw:1140px;
}

*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  font-size:16px;line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4{margin:0;line-height:1.25;letter-spacing:-.01em}
p{margin:0}
ul{margin:0;padding:0;list-style:none}
button{font:inherit;cursor:pointer}

.wrap{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 24px}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* ---------- 导航 ---------- */
.nav{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.86);
  backdrop-filter:saturate(180%) blur(14px);
  -webkit-backdrop-filter:saturate(180%) blur(14px);
  border-bottom:1px solid rgba(221,232,251,.9);
}
.nav-in{display:flex;align-items:center;gap:28px;height:66px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:17px;letter-spacing:0}
.brand-mark{
  width:34px;height:34px;border-radius:10px;flex:none;
  display:block;object-fit:cover;
  box-shadow:0 2px 8px rgba(18,46,110,.22);
}
.brand em{font-style:normal;color:var(--brand)}
.nav-links{display:flex;gap:26px;margin-left:8px;font-size:15px;color:var(--ink-2)}
.nav-links a{position:relative;padding:6px 0}
.nav-links a::after{
  content:"";position:absolute;left:0;right:100%;bottom:0;height:2px;
  background:var(--brand);transition:right .22s ease;border-radius:2px;
}
.nav-links a:hover{color:var(--ink)}
.nav-links a:hover::after{right:0}
.nav-cta{margin-left:auto;display:flex;align-items:center;gap:10px}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:44px;padding:0 20px;border-radius:12px;border:1px solid transparent;
  font-size:15px;font-weight:600;letter-spacing:.2px;white-space:nowrap;
  transition:transform .14s ease,box-shadow .14s ease,background .14s ease;
}
.btn svg{width:17px;height:17px;flex:none}
.btn-primary{
  background:#22b8f0;
  color:#fff;border-color:#0f9fd6;
  font-weight:700;
  box-shadow:0 3px 0 #0a83b3,0 8px 18px rgba(34,184,240,.28);
}
.btn-primary:hover{background:#3ec6f7;transform:translateY(-1px);box-shadow:0 3px 0 #0a83b3,0 12px 24px rgba(34,184,240,.34)}
.btn-primary:active{transform:translateY(2px);box-shadow:0 1px 0 #0a83b3,0 4px 10px rgba(34,184,240,.22)}
.btn-ghost{background:#fff;color:var(--ink);border-color:var(--line);box-shadow:var(--shadow-sm)}
.btn-ghost:hover{border-color:#c2d6f7;transform:translateY(-1px)}
.btn-sm{height:38px;padding:0 15px;font-size:14px;border-radius:10px}

.nav-toggle{display:none;width:42px;height:42px;border:1px solid var(--line);background:#fff;border-radius:12px;align-items:center;justify-content:center}
.nav-toggle svg{width:20px;height:20px}

/* ---------- Hero ---------- */
.hero{position:relative;overflow:hidden;padding:64px 0 56px}
.hero::before{
  content:"";position:absolute;inset:-10% -10% auto -10%;height:620px;z-index:0;
  background:
    radial-gradient(60% 70% at 18% 0%,#d8e8ff 0%,rgba(216,232,255,0) 62%),
    radial-gradient(45% 60% at 88% 12%,#fff2dc 0%,rgba(255,242,220,0) 60%);
}
.hero-in{position:relative;z-index:1;display:grid;grid-template-columns:1.02fr .98fr;gap:52px;align-items:center}

/* 首页专用：一进来只有标题和两个大按钮，撑满一屏、垂直居中 */
.hero-pick{
  padding:40px 0;text-align:center;
  min-height:calc(100vh - 66px);min-height:calc(100svh - 66px);
  display:flex;align-items:center;
}
.hero-pick .hero-in{display:flex;flex-direction:column;align-items:center}

.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  height:30px;padding:0 12px;border-radius:999px;
  background:#fff;border:1px solid #cddffb;color:var(--brand-d);
  font-size:13px;font-weight:600;letter-spacing:.3px;box-shadow:var(--shadow-sm);
}
.dot{width:6px;height:6px;border-radius:50%;background:var(--brand);box-shadow:0 0 0 3px rgba(47,111,224,.16)}

h1.hero-title{font-size:clamp(34px,4.4vw,56px);font-weight:800;margin:20px 0 18px;letter-spacing:-.02em}
h1.hero-title .hl{position:relative;color:var(--brand-d);white-space:nowrap}
h1.hero-title .hl::after{
  content:"";position:absolute;left:-2px;right:-2px;bottom:4px;height:12px;z-index:-1;
  background:linear-gradient(90deg,rgba(255,185,0,.5),rgba(255,185,0,.14));border-radius:6px;
}
.hero-pick .hero-title{font-size:clamp(28px,3.6vw,44px);margin:18px 0 0;max-width:18em;text-wrap:balance}
.br-m{display:none}
.lede{font-size:17px;color:var(--ink-2);max-width:520px}

/* 两个大按钮：一进来就在正中间，点了直接进对应页面 */
.entries{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:28px;width:100%;max-width:880px}
.entry{
  position:relative;display:flex;flex-direction:column;align-items:flex-start;text-align:left;
  min-height:228px;padding:32px 32px 26px;border-radius:22px;
  background:#fff;border:1.5px solid var(--line);
  box-shadow:0 2px 6px rgba(12,40,90,.04),0 14px 34px rgba(12,40,90,.06);
  transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease;
}
.entry:hover{transform:translateY(-4px);border-color:var(--brand);box-shadow:0 4px 10px rgba(12,40,90,.06),0 26px 52px rgba(47,111,224,.15)}
.entry.school:hover{border-color:#f0a13c;box-shadow:0 4px 10px rgba(12,40,90,.06),0 26px 52px rgba(210,120,36,.15)}
.entry-ico{
  width:60px;height:60px;border-radius:19px;display:grid;place-items:center;
  background:var(--brand-l);color:var(--brand-d);margin-bottom:18px;
}
.entry-ico svg{width:31px;height:31px}
.entry.school .entry-ico{background:var(--accent-l);color:#a8490a}
.entry-name{font-size:30px;font-weight:800;letter-spacing:-.03em;line-height:1.15}
.entry-desc{font-size:14.5px;color:var(--ink-3);line-height:1.65;margin-top:10px;max-width:21em}
.entry-go{
  display:inline-flex;align-items:center;gap:8px;align-self:flex-start;
  margin-top:auto;padding-top:22px;
  font-size:16px;font-weight:700;color:var(--brand-d);
}
.entry-go svg{width:17px;height:17px;transition:transform .18s ease}
.entry:hover .entry-go svg{transform:translateX(4px)}
.entry.school .entry-go{color:#a8490a}
.entry-badge{
  position:absolute;top:20px;right:20px;font-size:11.5px;font-weight:700;
  color:#a8490a;background:var(--accent-l);border:1px solid #ffd7ae;
  padding:3px 9px;border-radius:999px;
}

/* 首屏「已注册」入口：不抢大按钮的位置，只做一行辅助入口 */
.login-entry{margin-top:24px;font-size:14px}
.login-entry a{
  display:inline-flex;align-items:center;gap:6px;
  color:var(--ink-3);font-weight:600;
  transition:color .16s ease;
}
.login-entry a:hover{color:var(--brand-d)}
.login-entry svg{width:14px;height:14px;transition:transform .16s ease}
.login-entry a:hover svg{transform:translateX(3px)}

/* 数据条 */
.stats{display:flex;flex-wrap:wrap;gap:26px;margin-top:34px;padding-top:24px;border-top:1px solid #e6eefb}
.stat b{display:block;font-size:24px;font-weight:800;letter-spacing:-.02em;font-variant-numeric:tabular-nums}
.stat span{font-size:12.5px;color:var(--ink-3)}

/* 主视觉：横屏游戏窗口 */
.hero-art{position:relative}
.shot-frame{
  position:relative;border-radius:var(--radius-lg);overflow:hidden;background:#0b1a33;
  box-shadow:var(--shadow-lg);border:1px solid rgba(255,255,255,.6);
  transform:rotate(-1.4deg);transition:transform .4s ease;
}
.hero-art:hover .shot-frame{transform:rotate(0deg) translateY(-2px)}
.shot-frame img{width:100%;height:auto}
.shot-bar{display:flex;align-items:center;gap:6px;padding:9px 14px;background:#132a4a;color:#9fb6d8;font-size:11.5px;letter-spacing:.4px}
.shot-bar i{width:8px;height:8px;border-radius:50%;background:#2c4265;display:block}
.shot-bar i:nth-child(1){background:#ff6b5e}.shot-bar i:nth-child(2){background:#ffc14d}.shot-bar i:nth-child(3){background:#4ad07f}
.shot-bar span{margin-left:8px}

.float-chip{
  position:absolute;display:flex;align-items:center;gap:8px;
  padding:9px 14px;border-radius:14px;background:#fff;
  box-shadow:var(--shadow-md);border:1px solid var(--line);
  font-weight:700;font-size:14px;animation:bob 5s ease-in-out infinite;
}
.float-chip small{font-weight:500;font-size:12px;color:var(--ink-3)}
.float-chip.a{left:-26px;top:58px;animation-delay:.2s}
.float-chip.b{bottom:-18px;right:38%;animation-delay:1.1s}
.float-chip .tick{width:18px;height:18px;border-radius:50%;background:var(--brand);display:grid;place-items:center}
.float-chip .tick svg{width:11px;height:11px}
@keyframes bob{0%,100%{transform:translateY(0)}50%{transform:translateY(-7px)}}

/* ---------- 通用 section ---------- */
.sec{padding:82px 0;scroll-margin-top:78px}
.sec-head{max-width:660px}
.sec-head.center{margin:0 auto;text-align:center}
.sec-kicker{font-size:13px;font-weight:700;letter-spacing:1.2px;color:var(--brand-d);text-transform:uppercase}
.sec h2{font-size:clamp(25px,2.9vw,36px);margin:10px 0 14px;font-weight:800;letter-spacing:-.02em}
.sec-head p{color:var(--ink-2);font-size:16px}
.alt{background:#fff;border-top:1px solid #e8f0fd;border-bottom:1px solid #e8f0fd}

/* 三卡：为什么背了就忘 */
.cards-3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:40px}
.card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:24px 22px;box-shadow:var(--shadow-sm);
  transition:transform .18s ease,box-shadow .18s ease;
}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow-md)}
.card-ico{
  width:42px;height:42px;border-radius:12px;display:grid;place-items:center;margin-bottom:14px;
  background:var(--brand-l);color:var(--brand-d);
}
.card-ico svg{width:22px;height:22px}
.card h3{font-size:17.5px;margin-bottom:8px}
.card p{font-size:14.5px;color:var(--ink-2);line-height:1.75}
.card .fix{
  display:block;margin-top:14px;padding-top:12px;border-top:1px dashed #dde8fb;
  font-size:14px;color:var(--brand-d);font-weight:600;
}

/* 学习闭环 4 步 */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:40px;position:relative}
.step{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px 20px;box-shadow:var(--shadow-sm)}
.step-n{font-size:12px;font-weight:800;color:var(--brand);letter-spacing:1px}
.step h4{font-size:16.5px;margin:8px 0 6px}
.step p{font-size:14px;color:var(--ink-2);line-height:1.7}
.step-note{margin-top:26px;font-size:14px;color:var(--ink-3);text-align:center}

/* 游戏展示 */
.showcase{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-top:40px}
.shot-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-sm)}
.shot-card img{width:100%;height:auto}
.shot-cap{padding:14px 18px;font-size:14px;color:var(--ink-2);border-top:1px solid #e9f1fd}
.shot-cap b{color:var(--ink);font-weight:700}

.modes{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:22px}
.mode{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px;box-shadow:var(--shadow-sm)}
.mode b{display:block;font-size:15.5px;margin-bottom:4px}
.mode span{font-size:13.5px;color:var(--ink-3);line-height:1.65}

/* 贪吃蛇试玩 */
.minigame{margin-top:22px;background:linear-gradient(180deg,#eef5ff,#ffffff);border:1px solid #cfe0fa;border-radius:var(--radius);padding:22px}
.mg-head{display:flex;align-items:center;justify-content:space-between;gap:14px;flex-wrap:wrap;margin-bottom:14px}
.mg-q{display:flex;align-items:baseline;gap:10px;min-width:0}
.mg-q-label{font-size:13px;color:var(--ink-3);flex:none}
.mg-q b{font-size:24px;line-height:1.2;color:var(--brand-d);letter-spacing:.02em;transition:color .18s ease}
.mg-q b.ok{color:#0a8055}
.mg-q b.no{color:#d9534f}
.mg-stat{display:flex;gap:20px;font-size:13px;color:var(--ink-3);flex:none}
.mg-stat b{font-size:16px;color:var(--ink);font-variant-numeric:tabular-nums;margin-left:5px}
.mg-stage{position:relative;max-width:528px;margin:0 auto}
.mg-stage canvas{
  display:block;width:100%;height:auto;border-radius:12px;
  background:#f4f9ff;border:1px solid #c8dcf8;touch-action:none;outline:none;
}
.mg-stage canvas:focus-visible{box-shadow:0 0 0 3px rgba(47,111,224,.22)}
.mg-cover{
  position:absolute;inset:0;display:flex;align-items:center;justify-content:center;
  border-radius:12px;padding:16px;
}
.mg-cover[hidden]{display:none}
.mg-cover .btn{box-shadow:0 14px 30px rgba(47,111,224,.34)}

/* 虚拟摇杆 */
.mg-pad{display:flex;flex-direction:column;align-items:center;gap:9px;margin-top:16px}
.mg-pad p{font-size:12.5px;color:var(--ink-2);line-height:1.6;text-align:center}
.mg-pad p span{display:block;font-size:11.5px;color:var(--ink-3)}
.mg-stick{
  position:relative;flex:none;width:104px;height:104px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  background:radial-gradient(circle at 50% 46%,rgba(47,111,224,.15),rgba(47,111,224,.06));
  border:1.5px solid #b9d1f5;
  box-shadow:inset 0 2px 8px rgba(14,50,110,.07);
  touch-action:none;cursor:grab;
  transition:border-color .16s ease,background .16s ease;
  -webkit-user-select:none;user-select:none;
}
.mg-stick.on{
  border-color:#79d1ff;cursor:grabbing;
  background:radial-gradient(circle at 50% 46%,rgba(47,111,224,.24),rgba(47,111,224,.09));
}
.mg-knob{
  width:36px;height:36px;border-radius:50%;
  background:linear-gradient(135deg,#79d1ff,#2f6fe0);
  box-shadow:0 5px 14px rgba(47,111,224,.34);
  transition:transform .13s ease;will-change:transform;
}
.mg-stick.on .mg-knob{transition:none}
.mg-foot{margin-top:11px;font-size:12.5px;color:var(--ink-3);line-height:1.6;min-height:19px;text-align:center}

/* 教材 */
.stages{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:38px}
.stage{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow-sm)}
.stage-k{font-size:12px;font-weight:700;color:var(--brand);letter-spacing:.8px}
.stage b{display:block;font-size:19px;margin:6px 0 2px}
.stage .num{font-size:13px;color:var(--ink-3)}
.stage .num b{display:inline;font-size:13px;color:var(--ink-2);font-weight:700;margin:0}

.books{margin-top:26px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px}
.books h4{font-size:15px;margin-bottom:12px}
.books h4 span{font-weight:500;color:var(--ink-3);font-size:13px;margin-left:8px}
.book-chips{display:flex;flex-wrap:wrap;gap:8px}
.book-chips span{
  font-size:13px;color:var(--ink-2);background:#f3f7fe;border:1px solid #e6eefb;
  padding:5px 11px;border-radius:8px;
}
.path-line{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-top:20px;font-size:13.5px;color:var(--ink-3)}
.path-line b{color:var(--ink-2);font-weight:600}
.path-line .arrow{color:#b4c5e2}

/* 家长 */
.split{display:grid;grid-template-columns:1fr 1fr;gap:44px;align-items:center}
.checklist{display:grid;gap:14px;margin-top:24px}
.check{display:flex;gap:12px;align-items:flex-start}
.check .tick{
  flex:none;width:22px;height:22px;border-radius:50%;background:var(--brand-l);
  display:grid;place-items:center;margin-top:2px;
}
.check .tick svg{width:12px;height:12px;color:var(--brand-d)}
.check b{display:block;font-size:15.5px}
.check span{font-size:14px;color:var(--ink-2);line-height:1.7}

.panel{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);
  padding:24px;box-shadow:var(--shadow-md);
}
.panel-head{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:18px}
.panel-head b{font-size:15px;min-width:0}
.panel-head span{flex:none;white-space:nowrap;font-size:12px;color:var(--ink-3);background:#f3f7fe;border:1px solid #e6eefb;padding:3px 9px;border-radius:999px}
.kpis{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.kpi{background:#f6faff;border:1px solid #e9f1fd;border-radius:12px;padding:12px}
.kpi i{font-style:normal;font-size:11.5px;color:var(--ink-3);display:block}
.kpi b{font-size:20px;font-weight:800;letter-spacing:-.02em;font-variant-numeric:tabular-nums}
.kpi b small{font-size:12px;font-weight:600;color:var(--ink-3);margin-left:1px}
.bars{display:flex;align-items:flex-end;gap:8px;height:88px;margin:18px 0 6px}
.bars i{flex:1;background:linear-gradient(180deg,#79d1ff,#2f6fe0);border-radius:5px 5px 3px 3px;display:block}
.bars i.w{background:#dbe7fa}
.bar-x{display:flex;gap:8px;font-size:11px;color:#96a8c8}
.bar-x span{flex:1;text-align:center}
.weak-list{display:grid;gap:8px;margin-top:16px}
.weak{display:flex;align-items:center;justify-content:space-between;font-size:13.5px;padding:9px 12px;background:#fffaf3;border:1px solid #ffdfbc;border-radius:10px}
.weak em{font-style:normal;color:#a8490a;font-weight:700}

/* 学校 / 机构 */
.org-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:36px}
.org{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow-sm)}
.org h4{font-size:16px;margin-bottom:8px}
.org p{font-size:14px;color:var(--ink-2);line-height:1.75}
.org ul{margin-top:12px;display:grid;gap:7px}
.org li{font-size:13.5px;color:var(--ink-2);padding-left:16px;position:relative}
.org li::before{content:"";position:absolute;left:0;top:8px;width:6px;height:6px;border-radius:2px;background:#b9d1f5}
.org-note{
  margin-top:22px;display:flex;gap:14px;align-items:flex-start;flex-wrap:wrap;
  background:#fffaf3;border:1px solid #ffdfbc;border-radius:var(--radius);padding:18px 20px;
}
.org-note b{color:#8a4f0a}
.org-note p{font-size:14px;color:#7a5a2e;flex:1;min-width:240px}

/* 下载 */
.dl{position:relative;overflow:hidden;background:linear-gradient(160deg,#12244a 0%,#1a3566 55%,#0f1e3d 100%);color:#eaf2ff}
.dl::after{
  content:"";position:absolute;right:-120px;top:-140px;width:520px;height:520px;border-radius:50%;
  background:radial-gradient(circle,rgba(90,157,255,.32),rgba(90,157,255,0) 65%);
}
.dl .sec-kicker{color:#8fd0ff}
.dl h2{color:#fff}
.dl .sec-head p{color:#aec3e0}
.dl-in{position:relative;z-index:1;display:grid;grid-template-columns:1fr 300px;gap:44px;align-items:center;margin-top:8px}
.dl-box{background:rgba(255,255,255,.055);border:1px solid rgba(255,255,255,.14);border-radius:var(--radius-lg);padding:26px;backdrop-filter:blur(6px)}
.dl-meta{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:18px}
.dl-meta span{font-size:12.5px;color:#bcd4f5;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.14);padding:4px 11px;border-radius:999px}
.dl-actions{display:flex;gap:12px;flex-wrap:wrap}
.dl .btn-primary{box-shadow:0 3px 0 #0a83b3,0 10px 26px rgba(34,184,240,.38)}
.dl .btn-ghost{background:rgba(255,255,255,.08);border-color:rgba(255,255,255,.2);color:#eaf2ff}
.dl ol{margin:18px 0 0;padding-left:0;list-style:none;display:grid;gap:9px}
.dl ol li{display:flex;gap:10px;font-size:13.5px;color:#bed3ef;line-height:1.65}
.dl ol li i{
  flex:none;width:19px;height:19px;border-radius:50%;background:rgba(121,209,255,.18);color:#8fd0ff;
  font-style:normal;font-size:11px;font-weight:800;display:grid;place-items:center;margin-top:2px;
}
.qr{background:#fff;border-radius:var(--radius);padding:16px;text-align:center;box-shadow:var(--shadow-lg)}
.qr img{width:100%;height:auto;border-radius:8px}
.qr b{display:block;font-size:13.5px;color:var(--ink);margin-top:10px}
.qr span{font-size:12px;color:var(--ink-3)}

/* 微信名片卡：二维码 + 昵称 + 微信号 + 一键复制 */
.qr.contact img{display:block;max-width:200px;margin:0 auto;border-radius:6px}
.qr.contact b{font-size:15px;margin-top:12px;letter-spacing:.01em}
.qr.contact .wx-id{display:block;margin-top:4px;font-size:12.5px;color:var(--ink-2);letter-spacing:.02em;word-break:break-all}
.qr-copy{
  display:inline-block;margin-top:9px;padding:6px 15px;border-radius:999px;
  background:#e9f2ff;color:#1d54bc;border:1px solid #c9defb;
  font-size:12.5px;font-weight:600;cursor:pointer;transition:all .16s ease;font-family:inherit;
}
.qr-copy:hover{background:#dbe9ff;border-color:#bcd4fb}
.qr-copy.copied{background:#0a8055;border-color:#0a8055;color:#fff}

/* 深色区块里的微信号高亮 */
.wx-strong{color:#8fd0ff;font-weight:700;letter-spacing:.01em}
.copy-wx.copied{background:#0a8055;border-color:#0a8055;color:#fff;box-shadow:0 8px 20px rgba(10,128,85,.28)}
.copy-wx:focus-visible,.qr-copy:focus-visible{outline:2px solid #79d1ff;outline-offset:3px}
.copy-manual .copy-label{user-select:all;-webkit-user-select:all;cursor:text}

/* FAQ */
.faq{max-width:820px;margin:34px auto 0;display:grid;gap:10px}
.qa{background:#fff;border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow-sm);overflow:hidden}
.qa summary{
  list-style:none;cursor:pointer;padding:16px 20px;font-size:15.5px;font-weight:600;
  display:flex;align-items:center;justify-content:space-between;gap:12px;
}
.qa summary::-webkit-details-marker{display:none}
.qa summary::after{content:"+";font-size:20px;color:var(--brand);font-weight:400;line-height:1;transition:transform .2s ease}
.qa[open] summary::after{transform:rotate(45deg)}
.qa p{padding:0 20px 18px;font-size:14.5px;color:var(--ink-2);line-height:1.8}

/* 页脚 */
.footer{background:#0e1c33;color:#a8bcd9;padding:52px 0 30px;font-size:13.5px}
.foot-top{display:flex;gap:40px;justify-content:space-between;flex-wrap:wrap;padding-bottom:26px;border-bottom:1px solid rgba(255,255,255,.1)}
.foot-brand{display:flex;align-items:center;gap:10px;color:#fff;font-weight:700;font-size:16px}
.foot-brand .brand-mark{box-shadow:0 0 0 1px rgba(255,255,255,.22)}
.foot-cols{display:flex;gap:52px;flex-wrap:wrap}
.foot-col b{display:block;color:#e6f0ff;font-size:13.5px;margin-bottom:10px;font-weight:700}
.foot-col a,.foot-col span{display:block;color:#9db2d0;margin-bottom:7px;transition:color .16s}
.foot-col a:hover{color:#8fd0ff}
.foot-bot{padding-top:22px;display:flex;gap:16px;justify-content:space-between;flex-wrap:wrap;font-size:12.5px;color:#8698b8}
.foot-bot a{color:#9db2d0}
.foot-bot a:hover{color:#8fd0ff}

/* 动效 */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .6s cubic-bezier(.2,.7,.3,1),transform .6s cubic-bezier(.2,.7,.3,1)}
.reveal.in{opacity:1;transform:none}

/* ---------- 文档页（隐私/协议） ---------- */
.doc{max-width:820px;margin:0 auto;padding:52px 24px 80px}
.doc h1{font-size:30px;margin-bottom:8px}
.doc .doc-meta{font-size:13px;color:var(--ink-3);margin-bottom:28px}
.doc h2{font-size:18px;margin:30px 0 10px}
.doc p,.doc li{font-size:14.5px;color:var(--ink-2);line-height:1.9}
.doc ul{margin:8px 0 0;padding-left:0;list-style:none}
.doc ul+p{margin-top:12px}
.doc li{padding-left:16px;position:relative}
.doc li::before{content:"";position:absolute;left:0;top:11px;width:5px;height:5px;border-radius:50%;background:#bcd0ee}
.doc .back{display:inline-flex;align-items:center;gap:6px;font-size:14px;color:var(--brand-d);font-weight:600;margin-bottom:24px}



/* ---------- 身份条（子页顶部切换） ---------- */
.idbar{background:#0e1c33;color:#a8bcd9;font-size:12.5px}
.idbar-in{display:flex;align-items:center;gap:14px;height:46px;min-height:46px}
.idbar-t{color:#8698b8;letter-spacing:.04em}
.idseg{display:inline-flex;background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.12);border-radius:999px;padding:3px}
.idseg a{padding:4px 15px;border-radius:999px;font-weight:600;color:#aec3e0;transition:all .16s ease;white-space:nowrap}
.idseg a:hover{color:#fff}
.idseg a.on{background:#2f6fe0;color:#fff;box-shadow:0 2px 10px rgba(47,111,224,.42)}
.idbar-login{
  margin-left:auto;display:inline-flex;align-items:center;
  padding:3px 13px;border-radius:999px;
  border:1px solid rgba(255,255,255,.24);color:#d6e6ff;
  font-weight:600;white-space:nowrap;transition:all .16s ease;
}
.idbar-login:hover{background:rgba(255,255,255,.12);border-color:rgba(255,255,255,.44);color:#fff}
.idbar-back{margin-left:10px;color:#9db2d0;display:inline-flex;align-items:center;gap:5px;white-space:nowrap}
.idbar-back:hover{color:#8fd0ff}
.idbar-back svg{width:13px;height:13px}

/* ---------- 子页 Hero ---------- */
.hero-sub{padding:54px 0 46px}
.hero-sub .hero-title{font-size:clamp(28px,3.4vw,42px)}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:26px}

/* ---------- 班级进度表 ---------- */
.ptable{width:100%;border-collapse:collapse;font-size:13.5px}
.ptable th{
  text-align:left;font-size:11.5px;letter-spacing:.05em;color:var(--ink-3);
  font-weight:600;padding:0 10px 10px 0;border-bottom:1px solid var(--line);white-space:nowrap;
}
.ptable td{padding:11px 10px 11px 0;border-bottom:1px solid #eef4fe;color:var(--ink-2)}
.ptable tr:last-child td{border-bottom:0}
.ptable td b{color:var(--ink);font-weight:700}
.ptable td:first-child{white-space:nowrap}
.ptable th:last-child,.ptable td:last-child{padding-right:0}
.ptable .num{font-variant-numeric:tabular-nums}
.pcell{display:flex;align-items:center;gap:9px}
.pcell small{font-size:11.5px;color:var(--ink-3);font-variant-numeric:tabular-nums;flex:none}
.pbar{height:6px;border-radius:3px;background:#e9f1fd;overflow:hidden;width:100%;max-width:110px}
.pbar i{display:block;height:100%;border-radius:3px;background:linear-gradient(90deg,#79d1ff,#2f6fe0)}
.ptable .tag{display:inline-block;font-size:11.5px;font-weight:700;padding:2px 9px;border-radius:999px;white-space:nowrap}
.tag-ok{background:#e8f5ee;color:#0a8055}
.tag-warn{background:#fff2e6;color:#a8490a}
.tag-off{background:#f1f4fb;color:#7487a9}

/* ---------- 合作流程 ---------- */
.flow{display:grid;gap:0;margin-top:36px;border-left:2px solid #d7e6fc;padding-left:0}
.flow-item{position:relative;padding:0 0 26px 26px}
.flow-item:last-child{padding-bottom:0}
.flow-item::before{
  content:"";position:absolute;left:-7px;top:5px;width:12px;height:12px;border-radius:50%;
  background:#fff;border:2.5px solid var(--brand);
}
.flow-item h4{font-size:16px;margin-bottom:5px}
.flow-item p{font-size:14px;color:var(--ink-2);line-height:1.75;max-width:620px}
.flow-item span.n{position:absolute;left:26px;top:-2px;font-size:11.5px;font-weight:700;letter-spacing:.08em;color:var(--brand);display:none}

/* ---------- 收尾 CTA ---------- */
.switch-cta{
  margin-top:44px;display:flex;align-items:center;gap:18px;flex-wrap:wrap;
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:20px 24px;box-shadow:var(--shadow-sm);
}
.switch-cta b{font-size:16px}
.switch-cta p{font-size:13.5px;color:var(--ink-3);flex:1;min-width:200px}

/* ---------- 轻提示 ---------- */
.toast-tip{
  position:fixed;left:50%;bottom:34px;z-index:90;
  transform:translate(-50%,10px);
  max-width:min(92vw,430px);padding:12px 18px;border-radius:13px;
  background:rgba(14,28,51,.95);color:#eaf2ff;
  font-size:13.5px;line-height:1.65;text-align:left;
  box-shadow:0 14px 38px rgba(6,20,45,.32);
  opacity:0;pointer-events:none;
  transition:opacity .2s ease,transform .2s ease;
}
.toast-tip.on{opacity:1;transform:translate(-50%,0)}

/* ---------- 响应式 ---------- */
@media (max-width:1024px){
  .hero-in{grid-template-columns:1fr;gap:40px}
  .hero-art{order:2;max-width:620px}
  .cards-3,.stages,.org-grid{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:repeat(2,1fr)}
  .split{grid-template-columns:1fr;gap:32px}
  .dl-in{grid-template-columns:1fr;gap:28px}
  .qr{max-width:300px;margin:0 auto}
}
@media (max-width:760px){
  .nav-in{height:60px;gap:14px}
  .nav-links{display:none}
  .nav-cta{margin-left:auto}
  .nav-cta .btn-ghost{display:none}
  .nav-toggle{display:flex}
  .nav.open .nav-links{
    display:flex;position:absolute;left:0;right:0;top:60px;flex-direction:column;
    background:#fff;border-bottom:1px solid var(--line);padding:14px 24px 18px;gap:14px;
    box-shadow:0 18px 30px rgba(18,40,90,.08);
  }
  .hero{padding:40px 0 44px}
  .hero-pick{padding:24px 0;min-height:calc(100vh - 60px);min-height:calc(100svh - 60px)}
  .br-m{display:inline}
  .entries{grid-template-columns:1fr;margin-top:24px;gap:12px;max-width:none}
  .entry{min-height:0;padding:20px 22px 16px;border-radius:18px}
  .entry-ico{width:46px;height:46px;border-radius:15px;margin-bottom:12px}
  .entry-ico svg{width:25px;height:25px}
  .entry-name{font-size:24px}
  .entry-desc{font-size:12.5px;line-height:1.55;margin-top:6px}
  .entry-go{padding-top:14px;font-size:14.5px}
  .entry-badge{top:16px;right:16px}
  .stats{gap:18px}
  .stat b{font-size:20px}
  .cards-3,.stages,.steps,.modes,.showcase,.org-grid{grid-template-columns:1fr}
  .showcase{gap:16px}
  .mg-head{gap:8px;margin-bottom:10px}
  .mg-q b{font-size:20px}
  .mg-stat{gap:14px;font-size:12.5px}
  .mg-stat b{font-size:15px}
  .mg-foot{font-size:12px}
  .minigame{padding:16px}
  .mg-pad{gap:8px;margin-top:14px}
  .mg-stick{width:96px;height:96px}
  .mg-knob{width:32px;height:32px}
  .mg-pad p{font-size:12px}
  .sec{padding:56px 0}
  .float-chip.a{left:-4px;top:-14px}
  .float-chip.b{right:-4px;bottom:-10px}
  .dl-actions{flex-direction:column;gap:10px}
  .dl-actions .btn{width:100%}
  .foot-cols{gap:28px}
}
/* 子页在窄屏的收口 */
@media (max-width:760px){
  .idbar-in{height:auto;min-height:0;padding:9px 24px;gap:10px;flex-wrap:wrap}
  .idbar-t{display:none}
  .idseg a{padding:4px 12px;font-size:12px}
  .idbar-back{font-size:12px}
  .idbar-login{font-size:12px;padding:3px 11px}
  .login-entry{font-size:13.5px;margin-top:14px}
  .hero-sub{padding:38px 0 40px}
  .hero-actions{flex-direction:column}
  .hero-actions .btn{width:100%}
  .switch-cta{padding:18px}
  .switch-cta .btn{width:100%}
}

/* 手机窄屏：进度表只留「学生 / 进度 / 状态」，明细列在桌面看 */
@media (max-width:560px){
  .pt-4 th:nth-child(3),.pt-4 td:nth-child(3){display:none}
  .pt-5 th:nth-child(3),.pt-5 td:nth-child(3),
  .pt-5 th:nth-child(4),.pt-5 td:nth-child(4){display:none}
  .ptable td{padding:10px 8px 10px 0}
}

/* 小屏（360 一档）把进度表压紧，避免横向溢出 */
@media (max-width:420px){
  .panel{padding:18px}
  .ptable{font-size:12.5px}
  .ptable th,.ptable td{padding:9px 7px 9px 0}
  .pcell{gap:7px}
  .pbar{max-width:66px}
  .pcell small{font-size:11px}
  .idbar-back{font-size:11.5px}
}

/* 380 以下身份条三样东西挤一行，收窄才不折行 */
@media (max-width:380px){
  .idbar-in{gap:8px;padding:9px 18px}
  .idseg a{padding:4px 10px;font-size:11.5px}
  .idbar-login{padding:3px 9px;font-size:11.5px}
  .idbar-back{font-size:11.5px}
}

@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
  .reveal{opacity:1;transform:none}
}