/* AlphaAi · H5 设计系统
   移动端：单列 + 底部 Tab；桌面端：左侧固定栏 + 右侧内容（同一套组件）
   底 #030303 / 卡 #141414 / 主色 #CBE86A */

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}

:root{
  --bg:#030303;
  --bg-2:#080808;
  --card:#141414;
  --card-2:#1a1a1a;
  --line:rgba(255,255,255,.07);
  --line-2:rgba(255,255,255,.13);
  --ink:#F2F3EE;
  --muted:#9AA09A;
  --faint:#6E746E;
  --lime:#CBE86A;
  --lime-2:#DFF58A;
  --lime-deep:#9FC24A;
  --gold:#E8C46A;
  --red:#FF6161;
  --r:16px;
  --r-lg:20px;
  --r-pill:999px;
  --font:-apple-system,BlinkMacSystemFont,"Helvetica Neue",Helvetica,"Segoe UI",Arial,Roboto,"PingFang SC",miui,"Hiragino Sans GB","Microsoft Yahei",sans-serif;
  --num:var(--font);
  --dur:.22s;
  --ease:cubic-bezier(.22,.61,.36,1);
  --rail:280px;
}

html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
html,body{overflow-x:clip}
body{
  min-height:100vh;
  font-family:var(--font);
  color:var(--ink);
  font-size:16px;
  line-height:24px;
  background:
    radial-gradient(circle at 18% -10%,rgba(203,232,106,.10),transparent 42%),
    linear-gradient(180deg,#050505,#030303 60%,#050505);
  background-attachment:fixed;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img,svg{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer;background:none;border:0}
::selection{background:rgba(203,232,106,.24)}
:where(a,button,input,label,[tabindex]):focus-visible{outline:none;box-shadow:0 0 0 3px rgba(203,232,106,.32);border-radius:12px}

/* ---------------- 布局骨架 ---------------- */
.h5-app{display:flex;min-height:100vh}
.rail{display:none}
.stage{flex:1;min-width:0;display:flex;flex-direction:column}
.main{width:100%;max-width:820px;margin:0 auto;padding:0 18px 120px}

/* 顶栏 */
.appbar{
  position:sticky;top:0;z-index:40;
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:12px 18px;
  background:rgba(3,3,3,.82);
  backdrop-filter:blur(16px);
  border-bottom:1px solid var(--line);
}
.brand{display:inline-flex;align-items:center;gap:10px;min-width:0}
.brand-mark{width:36px;height:36px;flex:none;background:transparent;border:0;border-radius:0;overflow:visible}
.brand-mark img{width:100%;height:100%;display:block}
.brand-mark img{width:100%;height:100%}
.brand-text{display:flex;flex-direction:column;min-width:0}
.brand-name{font-family:var(--num);font-weight:800;font-size:15px;line-height:1.1}
.brand-sub{font-size:9.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--faint);line-height:1.6;white-space:nowrap}
.nav-actions{display:flex;align-items:center;gap:8px}

/* 按钮 */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:44px;padding:0 18px;border-radius:var(--r-pill);
  font-weight:600;font-size:15px;white-space:nowrap;border:1px solid transparent;
  transition:transform var(--dur) var(--ease),background var(--dur) var(--ease),border-color var(--dur) var(--ease),opacity var(--dur) var(--ease),box-shadow var(--dur) var(--ease);
}
.btn:active{transform:translateY(1px) scale(.99)}
.btn-lime{background:linear-gradient(135deg,var(--lime),var(--lime-2));color:#0A0A0A;box-shadow:0 10px 26px rgba(203,232,106,.22)}
.btn-lime:hover{box-shadow:0 14px 34px rgba(203,232,106,.32)}
.btn-dark{background:var(--card-2);color:var(--ink);border-color:var(--line-2)}
.btn-dark:hover{border-color:rgba(203,232,106,.45)}
.btn-ghost{background:transparent;color:var(--muted);border-color:var(--line-2)}
.btn-ghost:hover{color:var(--ink);border-color:var(--line-2);background:rgba(255,255,255,.04)}
.btn-block{width:100%}
.btn-lg{min-height:48px;padding:0 12px;font-size:16px;flex:1;min-width:0}
.btn-sm{min-height:36px;padding:0 14px;font-size:13px}

/* 卡片 */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r-lg);padding:18px}
.card + .card{margin-top:12px}

/* 段落标题 */
.sec-head{margin:40px 0 16px;text-align:center}
.kicker{display:inline-block;font-size:11px;letter-spacing:.18em;text-transform:uppercase;color:var(--lime);font-weight:800}
.sec-head h2{margin-top:0;font-size:20px;line-height:27px;font-weight:700;letter-spacing:0}
.sec-head p{margin:8px auto 0;color:rgba(255,255,255,.45);font-size:13px;line-height:21px;max-width:420px}
.sec-head em{font-style:normal;color:var(--lime)}

/* ---------------- 首页 ---------------- */
.hero{position:relative;padding:26px 0 8px;text-align:center;overflow:hidden}
.hero::before{
  content:"";position:absolute;left:50%;top:-24px;width:min(720px,150%);height:410px;
  transform:translateX(-50%);pointer-events:none;z-index:-1;opacity:.55;
  background:repeating-conic-gradient(from 186deg at 50% 122%,rgba(255,255,255,.14) 0 .22deg,transparent .22deg 2.6deg);
  -webkit-mask-image:radial-gradient(60% 62% at 50% 108%,#000 6%,transparent 72%);
  mask-image:radial-gradient(60% 62% at 50% 108%,#000 6%,transparent 72%);
}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  padding:7px 13px;border-radius:var(--r-pill);
  border:1px solid rgba(203,232,106,.28);background:rgba(203,232,106,.08);
  color:var(--lime);font-size:11px;font-weight:800;letter-spacing:.1em;text-transform:uppercase;
}
.hero h1{
  margin:0;font-size:30px;line-height:36px;
  font-weight:700;letter-spacing:-.4px;
}
.hero h1 span{display:block}
.hl1{
  background:linear-gradient(96deg,#7fb4ff 0%,#eaf3ff 36%,#ffd3dc 64%,#ff8fa3 100%);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hl2{
  background:linear-gradient(96deg,#8fc9ff 0%,#bfe878 52%,#CBE86A 100%);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero .lead{margin:18px auto 0;color:rgba(255,255,255,.45);font-size:13px;line-height:22px;max-width:420px;text-align:center}
.hero-actions{display:flex;gap:12px;width:100%;max-width:420px;margin:36px auto 0}
.hero-note{margin-top:14px;color:var(--faint);font-size:11.5px;text-align:center}

.stat-line{display:flex;justify-content:center;gap:18px;flex-wrap:wrap;margin-top:26px;color:rgba(255,255,255,.4);font-size:11px;line-height:16px}
.stat-line b{color:#fff;font-size:12px;font-weight:700;margin-right:3px}
.stat-row{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:24px}
.stat{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:14px 12px;text-align:center}
.stat strong{display:block;font-family:var(--num);font-size:20px;font-weight:800;color:var(--lime);line-height:1.2}
.stat span{display:block;margin-top:5px;font-size:11px;color:var(--faint)}

.grid8{
  display:grid;grid-template-columns:repeat(4,1fr);gap:0;
  padding:22px 10px;background:#0e0e0e;border:1px solid var(--line);border-radius:16px;
}
.grid8 > div{display:flex;flex-direction:column;align-items:center;gap:4px;padding:10px 2px}
.grid8 b{font-size:14px;line-height:20px;font-weight:600;color:#fff}
.grid8 span{font-size:11px;line-height:16px;color:rgba(255,255,255,.4);white-space:nowrap}

.feat-list{display:grid;gap:12px}
.feat{display:flex;gap:12px;align-items:flex-start;background:var(--card);border:1px solid var(--line);border-radius:16px;padding:18px}
.feat-ic{width:46px;height:46px;flex:none;border-radius:13px;display:grid;place-items:center;background:rgba(203,232,106,.1);border:1px solid rgba(203,232,106,.22);color:var(--lime)}
.feat-ic svg{width:20px;height:20px}
.feat b{display:block;font-size:15px;line-height:22.5px;font-weight:700}
.feat p{margin-top:4px;color:rgba(255,255,255,.45);font-size:12.5px;line-height:20px}

.news-list{display:grid;gap:10px}
.news-item{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:15px 16px}
.news-item .t{display:flex;align-items:center;gap:8px;flex-wrap:wrap;font-weight:700;font-size:14px}
.news-item .d{margin-left:auto;color:var(--faint);font-size:11px;font-family:var(--num)}
.news-item p{margin-top:7px;color:var(--muted);font-size:13px;line-height:1.75;white-space:pre-wrap}
.news-badge{font-size:10px;padding:2px 8px;border-radius:var(--r-pill);border:1px solid rgba(203,232,106,.4);color:var(--lime);font-weight:700}

.cta-card{
  margin-top:34px;padding:24px 20px;border-radius:var(--r-lg);
  border:1px solid rgba(203,232,106,.28);
  background:
    radial-gradient(120% 130% at 90% 0%,rgba(203,232,106,.16),transparent 58%),
    var(--card);
}
.cta-card h2{font-size:20px;font-weight:800;line-height:1.35}
.cta-card p{margin-top:8px;color:var(--muted);font-size:13px;line-height:1.8}
.cta-card .btn{margin-top:16px}

.foot{padding:26px 18px 40px;text-align:center;color:var(--faint);font-size:11.5px;border-top:1px solid var(--line)}
.foot p + p{margin-top:6px}

/* 底部 Tab（仅移动端） */
.tabbar{
  position:fixed;left:12px;right:12px;bottom:12px;z-index:50;
  display:grid;grid-template-columns:repeat(4,1fr);gap:2px;
  padding:6px;border-radius:22px;
  background:rgba(16,16,16,.94);
  border:1px solid rgba(203,232,106,.22);
  box-shadow:0 18px 46px rgba(0,0,0,.6);
  backdrop-filter:blur(18px);
}
.tabbar a{
  display:flex;flex-direction:column;align-items:center;gap:3px;
  padding:7px 2px;border-radius:16px;color:var(--faint);font-size:10.5px;font-weight:600;
  transition:color var(--dur) var(--ease),background var(--dur) var(--ease);
}
.tabbar a svg{width:19px;height:19px}
.tabbar a.on{color:#0A0A0A;background:var(--lime)}
.tabbar a:not(.on):active{background:rgba(255,255,255,.05)}

/* ---------------- 登录 / 注册 ---------------- */
.auth-shell{display:flex;min-height:100vh;flex-direction:column}
.auth-side{display:none}
.auth-stage{flex:1;display:flex;flex-direction:column;min-width:0}
.auth-main{flex:1;width:100%;max-width:440px;margin:0 auto;padding:22px 18px 40px}

.auth-card{background:var(--card);border:1px solid var(--line);border-radius:var(--r-lg);padding:22px 18px}
.form-header{margin-bottom:20px}
.form-header h1{font-family:var(--num);font-size:25px;font-weight:800;letter-spacing:-.01em}
.form-header p{margin-top:7px;color:var(--muted);font-size:13px}
.form-header a{color:var(--lime);font-weight:700}
.form-header a:hover{text-decoration:underline}

.form-error{
  display:none;margin-bottom:16px;padding:11px 13px;border-radius:12px;
  background:rgba(255,97,97,.1);border:1px solid rgba(255,97,97,.32);
  color:#FFB3B3;font-size:12.5px;line-height:1.6;
}
.form-error.show{display:block}

.form-group{margin-bottom:15px}
.form-label{display:block;font-size:12.5px;font-weight:600;color:var(--muted);margin-bottom:7px}
.form-input{
  width:100%;min-height:46px;padding:11px 14px;
  background:var(--card-2);border:1px solid var(--line-2);border-radius:12px;
  color:var(--ink);font-size:14px;outline:none;
  transition:border-color var(--dur) var(--ease),box-shadow var(--dur) var(--ease),background var(--dur) var(--ease);
}
.form-input::placeholder{color:var(--faint)}
.form-input:hover{border-color:rgba(255,255,255,.2)}
.form-input:focus{border-color:var(--lime);box-shadow:0 0 0 3px rgba(203,232,106,.16);background:#191919}
.form-input.err{border-color:var(--red);box-shadow:0 0 0 3px rgba(255,97,97,.14)}
.form-input-wrap{position:relative}
.form-input-wrap .form-input{padding-right:46px}
.fi-icon{position:absolute;right:13px;top:50%;transform:translateY(-50%);cursor:pointer;color:var(--faint);font-size:14px;user-select:none}
.fi-icon:hover{color:var(--muted)}
.field-err{display:none;margin-top:6px;font-size:12px;color:#FF9A9A}
.field-err.show{display:block}
.hint{margin-top:6px;font-size:11.5px;color:var(--faint);line-height:1.6}
.hint b{color:var(--muted)}

.pw-meter{height:4px;border-radius:99px;background:rgba(255,255,255,.08);margin-top:8px;overflow:hidden}
.pw-meter i{display:block;height:100%;width:0;border-radius:99px;transition:width .25s,background .25s}

.captcha-row{display:grid;grid-template-columns:minmax(0,1fr) 112px;gap:8px;align-items:center}
.captcha-visual{height:46px;display:flex;align-items:center;justify-content:center;gap:4px;border:1px solid var(--line-2);border-radius:12px;background:var(--card-2);overflow:hidden}
.captcha-visual canvas{display:block;width:96px;height:38px;border-radius:8px;cursor:pointer}
.captcha-refresh{width:24px;height:38px;border:0;background:transparent;color:var(--lime);cursor:pointer;font-size:15px}

.form-row{display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap;margin-bottom:18px}
.form-check{display:inline-flex;align-items:flex-start;gap:8px;font-size:12.5px;color:var(--muted);cursor:pointer;line-height:1.6}
.form-check input{width:15px;height:15px;margin-top:2px;accent-color:var(--lime);cursor:pointer;flex:none}
.form-check a{color:var(--lime)}
.form-forgot{font-size:12.5px;color:var(--faint)}
.form-forgot:hover{color:var(--lime)}

.btn-submit{
  width:100%;min-height:50px;border:0;border-radius:14px;
  background:linear-gradient(135deg,var(--lime),var(--lime-2));color:#0A0A0A;
  font-family:var(--num);font-size:15.5px;font-weight:800;letter-spacing:.02em;
  box-shadow:0 12px 30px rgba(203,232,106,.24);
  transition:transform var(--dur) var(--ease),box-shadow var(--dur) var(--ease),opacity var(--dur) var(--ease);
}
.btn-submit:hover{transform:translateY(-1px);box-shadow:0 16px 38px rgba(203,232,106,.32)}
.btn-submit:active{transform:translateY(0) scale(.99)}
.btn-submit:disabled{opacity:.6;cursor:not-allowed;transform:none}
.btn-submit.loading{color:transparent;position:relative}
.btn-submit.loading::after{content:"";position:absolute;inset:0;margin:auto;width:18px;height:18px;border-radius:50%;border:2px solid rgba(10,10,10,.3);border-top-color:#0A0A0A;animation:spin .7s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}

.divider{display:flex;align-items:center;gap:12px;margin:18px 0}
.divider::before,.divider::after{content:"";flex:1;height:1px;background:var(--line)}
.divider span{font-size:11.5px;color:var(--faint)}
.btn-google{width:100%;min-height:46px;display:flex;align-items:center;justify-content:center;gap:9px;border-radius:12px;border:1px solid var(--line-2);background:var(--card-2);color:var(--muted);font-size:13.5px;font-weight:600}
.btn-google:hover{color:var(--ink);border-color:rgba(255,255,255,.2)}
.invite-banner{margin-bottom:16px;padding:11px 13px;border-radius:12px;border:1px solid rgba(203,232,106,.3);background:rgba(203,232,106,.08);color:var(--lime);font-size:12.5px;line-height:1.6}

.auth-foot{margin-top:18px;text-align:center;color:var(--faint);font-size:11.5px;line-height:1.8}
.auth-foot a{color:var(--muted)}
.auth-foot a:hover{color:var(--lime)}

/* toast（site.js 动态创建） */
.toast-wrap{position:fixed;left:50%;bottom:96px;transform:translateX(-50%);z-index:90;display:grid;gap:8px;width:min(420px,calc(100% - 32px))}
.toast{padding:12px 15px;border-radius:14px;border:1px solid var(--line-2);background:rgba(20,20,20,.97);color:var(--ink);font-size:13px;box-shadow:0 18px 44px rgba(0,0,0,.55);animation:fadeUp .26s var(--ease) both}
.toast.ok{border-color:rgba(203,232,106,.5)}
.toast.bad{border-color:rgba(255,97,97,.5)}
@keyframes fadeUp{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}

/* reveal */
.reveal{opacity:0;transform:translateY(12px);transition:opacity .5s var(--ease),transform .5s var(--ease)}
.reveal.in{opacity:1;transform:none}

/* ---------------- 桌面端：左栏 + 右内容 ---------------- */
@media (min-width:900px){
  .h5-app{display:grid;grid-template-columns:var(--rail) minmax(0,1fr)}
  .rail{
    display:flex;flex-direction:column;gap:26px;
    position:sticky;top:0;height:100vh;padding:26px 22px;
    border-right:1px solid var(--line);
    background:linear-gradient(180deg,rgba(16,16,16,.6),rgba(3,3,3,.2));
  }
  .rail .brand-mark{width:40px;height:40px}
  .rail .brand-name{font-size:17px}
  .rail-nav{display:flex;flex-direction:column;gap:4px;margin-top:6px}
  .rail-nav a{display:flex;align-items:center;gap:9px;padding:10px 12px;border-radius:12px;color:var(--muted);font-size:13.5px;font-weight:600;transition:background var(--dur) var(--ease),color var(--dur) var(--ease)}
  .rail-nav a:hover{background:rgba(255,255,255,.04);color:var(--ink)}
  .rail-nav a.on{background:rgba(203,232,106,.12);color:var(--lime)}
  .rail-nav a::before{content:"";width:5px;height:5px;border-radius:50%;background:currentColor;opacity:.5}
  .rail-cta{display:grid;gap:8px}
  .rail-foot{margin-top:auto;color:var(--faint);font-size:11px;line-height:1.8}

  .appbar{padding:14px 36px;background:rgba(3,3,3,.7)}
  .appbar .brand{display:none}
  .appbar{justify-content:flex-end}
  .main{max-width:880px;padding:0 36px 60px}
  .hero{padding-top:64px}
  .hero h1{font-size:38px;line-height:46px;letter-spacing:-.6px}
  .hero .lead{font-size:13px;line-height:22px;max-width:460px}
  .sec-head h2{font-size:24px;line-height:32px}
  .stat-row{gap:12px;margin-top:30px}
  .stat{padding:18px 14px}
  .stat strong{font-size:24px}
  .feat-list{grid-template-columns:repeat(3,1fr);gap:12px}
  .feat{flex-direction:column;gap:0;padding:20px}
  .feat b{margin-top:14px}
  .feat p{margin-top:6px;font-size:12.5px}
  .tabbar{display:none}
  .foot{padding:30px 36px 46px;text-align:left;border-top:1px solid var(--line);max-width:952px;margin:0 auto;width:100%}

  /* 登录/注册：左品牌 + 右表单 */
  .auth-shell{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.05fr);min-height:100vh}
  .auth-side{
    display:flex;flex-direction:column;justify-content:space-between;
    padding:38px 42px;position:sticky;top:0;height:100vh;overflow:hidden;
    border-right:1px solid var(--line);
    background:
      radial-gradient(70% 55% at 15% 0%,rgba(203,232,106,.16),transparent 60%),
      linear-gradient(180deg,#0a0a0a,#050505);
  }
  .auth-side h2{margin:40px 0 0;font-size:clamp(26px,2.4vw,36px);line-height:1.25;font-weight:800;letter-spacing:-.01em}
  .auth-side h2 em{font-style:normal;color:var(--lime)}
  .auth-side p{margin-top:14px;color:var(--muted);font-size:14px;max-width:380px;line-height:1.85}
  .auth-points{display:grid;gap:12px;margin-top:30px;max-width:400px}
  .auth-point{display:flex;gap:11px;align-items:flex-start;padding:13px 14px;border-radius:14px;background:rgba(255,255,255,.03);border:1px solid var(--line)}
  .auth-point b{display:block;font-size:13.5px}
  .auth-point span{display:block;margin-top:2px;font-size:11.5px;color:var(--faint)}
  .auth-point i{width:32px;height:32px;flex:none;border-radius:10px;display:grid;place-items:center;background:rgba(203,232,106,.1);border:1px solid rgba(203,232,106,.22);color:var(--lime);font-style:normal;font-size:14px}
  .auth-side-foot{color:var(--faint);font-size:11.5px}
  .auth-side-foot a{color:var(--muted)}
  .auth-main{max-width:420px;margin:0 auto;padding:64px 18px 48px}
  .auth-card{background:transparent;border:0;padding:0}
}

@media (max-width:899px){
  .only-desktop{display:none}
  .main{padding-bottom:104px}
  .foot{padding-bottom:104px}
}

@media (max-width:560px){
  .brand-sub{display:none}
  .appbar{padding:10px 14px;gap:8px}
  .nav-actions{gap:6px}
  .nav-actions .btn-sm{padding:0 12px;font-size:13px;min-height:34px}
  .main{padding-left:16px;padding-right:16px}
  .tabbar{left:8px;right:8px;bottom:8px;padding:5px}
  .tabbar a{font-size:10px;padding:6px 1px}
  .tabbar a svg{width:18px;height:18px}
}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important;scroll-behavior:auto!important}
  .reveal{opacity:1;transform:none}
}

/* 移动端登录/注册的标题区（桌面端由左侧品牌区承担） */
.auth-intro{margin-bottom:18px}
.auth-intro h2{font-family:var(--num);font-size:23px;font-weight:800;line-height:1.25;letter-spacing:-.01em}
.auth-intro h2 em{font-style:normal;color:var(--lime)}
.auth-intro p{margin-top:7px;color:var(--muted);font-size:13px;line-height:1.7}
@media (min-width:900px){.auth-intro{display:none}}