:root{
  --bg:#090909;--bg2:#0e0e0e;--card:#121211;--line:#2a2924;--line-soft:#1e1d1a;
  --orange:#ff6a00;--orange-soft:rgba(255,106,0,.1);--marble:#c8c3b8;
  --t1:#e8e5de;--t2:#aaa69d;--t3:#706d65;--danger:#e0786f;
}
*{box-sizing:border-box}
html,body{min-height:100%;margin:0}
body{
  color:var(--t1);background:var(--bg);font-family:Inter,"Noto Sans TC",sans-serif;
  -webkit-font-smoothing:antialiased;overscroll-behavior-y:none;
}
button,input{font:inherit}
button{cursor:pointer}
[hidden]{display:none!important}
:focus-visible{outline:1px solid var(--orange);outline-offset:3px}
.auth-shell{display:grid;grid-template-columns:minmax(360px,42%) minmax(520px,1fr);min-height:100vh}
.brand-panel{
  position:relative;display:flex;flex-direction:column;padding:38px 52px 44px;
  border-right:1px solid var(--line);background:
  radial-gradient(circle at 18% 82%,rgba(255,106,0,.09),transparent 30%),
  linear-gradient(145deg,#11110f,var(--bg) 62%);
  overflow:hidden;
}
.brand-panel::after{
  content:"";position:absolute;right:11%;bottom:-18%;width:220px;height:570px;
  border:1px solid rgba(200,195,184,.08);border-radius:50% 50% 0 0;transform:rotate(18deg);
}
.brand{position:relative;z-index:1;display:flex;align-items:center;gap:15px;color:inherit;text-decoration:none}
.brand svg{width:10px;height:43px;fill:var(--marble)}
.brand span{font-family:"DM Mono",monospace;font-size:14px;letter-spacing:.34em}
.brand-copy{position:relative;z-index:1;max-width:520px;margin:auto 0}
.eyebrow,.form-heading>p{
  margin:0 0 15px;color:var(--orange);font-family:"DM Mono",monospace;
  font-size:9px;letter-spacing:.14em;text-transform:uppercase;
}
.brand-copy h1{
  max-width:470px;margin:0 0 20px;color:#ded9cf;font-family:"Noto Serif TC","Cormorant Garamond",serif;
  font-size:clamp(34px,4vw,62px);font-weight:500;line-height:1.15;letter-spacing:-.02em;
}
.brand-copy>p:last-child{max-width:470px;margin:0;color:var(--t2);font-size:14px;line-height:1.9}
.trust-note{position:relative;z-index:1;display:flex;align-items:flex-start;gap:10px;max-width:390px}
.trust-note>i{width:6px;height:6px;margin-top:5px;border-radius:50%;background:var(--orange);box-shadow:0 0 0 5px var(--orange-soft)}
.trust-note div{display:flex;flex-direction:column;gap:4px}
.trust-note strong{color:var(--marble);font-family:"DM Mono",monospace;font-size:9px;font-weight:400}
.trust-note span{color:var(--t3);font-size:10px;line-height:1.6}
.form-panel{display:flex;min-width:0;flex-direction:column;padding:25px 40px 22px;background:var(--bg)}
.form-top{display:flex;justify-content:flex-end}
.language-menu{position:relative;flex:0 0 auto}
.language-trigger{
  position:relative;display:grid;width:38px;height:38px;padding:0;place-items:center;
  border:1px solid var(--line);border-radius:50%;color:var(--marble);
  background:radial-gradient(circle at 35% 28%,#24231f 0,#141412 45%,var(--bg2) 72%);
  box-shadow:inset 0 0 0 3px rgba(255,255,255,.015),0 7px 20px rgba(0,0,0,.2);
  font-family:"DM Mono",monospace;
}
.language-trigger>span{font-size:9px;font-weight:500;letter-spacing:.02em}
.language-trigger>i{
  position:absolute;right:-3px;bottom:-2px;display:grid;width:15px;height:15px;place-items:center;
  border:2px solid var(--bg);border-radius:50%;color:#17100b;background:var(--orange);
  font-size:9px;font-style:normal;line-height:1;transition:transform .18s ease;
}
.language-trigger:hover,.language-menu.open .language-trigger{border-color:#6a4025;color:var(--t1)}
.language-menu.open .language-trigger>i{transform:rotate(180deg)}
.language-popover{
  position:absolute;z-index:120;top:calc(100% + 10px);right:0;display:grid;width:158px;gap:3px;
  padding:7px;border:1px solid var(--line);border-radius:16px;background:color-mix(in srgb,var(--bg2) 96%,transparent);
  box-shadow:0 18px 48px rgba(0,0,0,.42);backdrop-filter:blur(18px);
}
.language-popover[hidden]{display:none}
.language-popover::before{
  content:"";position:absolute;top:-4px;right:16px;width:7px;height:7px;
  border-top:1px solid var(--line);border-left:1px solid var(--line);background:var(--bg2);transform:rotate(45deg);
}
.language-option{
  display:grid;grid-template-columns:30px minmax(0,1fr) 14px;align-items:center;gap:9px;
  min-height:40px;padding:4px 8px 4px 4px;border:0;border-radius:11px;color:var(--t3);
  background:transparent;text-align:left;
}
.language-option:hover{color:var(--t1);background:var(--card)}
.language-option>span{
  display:grid;width:30px;height:30px;place-items:center;border:1px solid var(--line);
  border-radius:50%;background:var(--bg);font-family:"DM Mono",monospace;font-size:8px;
}
.language-option>b{font-size:10px;font-weight:500}
.language-option>i{opacity:0;color:var(--orange);font-size:9px;font-style:normal}
.language-option.active{color:var(--t1);background:var(--orange-soft)}
.language-option.active>span{border-color:var(--orange);color:#17100b;background:var(--orange)}
.language-option.active>i{opacity:1}
.form-card{width:min(100%,650px);margin:auto;padding:38px 42px;border:1px solid var(--line);border-radius:7px;background:var(--bg2)}
.form-heading{margin-bottom:25px}
.form-heading h2{
  margin:0 0 8px;color:#ded9cf;font-family:"Noto Serif TC","Cormorant Garamond",serif;
  font-size:29px;font-weight:500;
}
.form-heading>span{color:var(--t3);font-size:12px;line-height:1.6}
.auth-tabs{display:grid;grid-template-columns:1fr 1fr;margin-bottom:22px;border-bottom:1px solid var(--line)}
.auth-tabs button{
  position:relative;padding:10px;border:0;color:var(--t3);background:transparent;
  font-family:"DM Mono",monospace;font-size:10px;
}
.auth-tabs button.active{color:var(--t1)}
.auth-tabs button.active::after{content:"";position:absolute;right:22%;bottom:-1px;left:22%;height:1px;background:var(--orange)}
.form-message{display:none;margin-bottom:16px;padding:10px 12px;border:1px solid #5b2b29;border-radius:4px;color:#e6a29c;background:rgba(170,57,48,.08);font-size:11px;line-height:1.6}
.form-message.show{display:block}
.form-message[data-tone="success"]{border-color:#31523a;color:#a9d4b2;background:rgba(65,128,77,.1)}
.account-form{display:flex;flex-direction:column;gap:16px}
.field-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.account-form label{display:flex;min-width:0;flex-direction:column;gap:7px}
.account-form label>span{color:var(--t2);font-family:"DM Mono",monospace;font-size:9px}
.account-form input{
  width:100%;height:44px;padding:0 12px;border:1px solid var(--line);border-radius:4px;
  outline:0;color:var(--t1);background:var(--bg);
}
.account-form input::placeholder{color:#55534d}
.account-form input:focus{border-color:#674021}
.account-form label>small{color:var(--t3);font-size:9px;line-height:1.5}
.password-field{position:relative}
.password-field input{padding-right:72px}
.password-field button{
  position:absolute;top:50%;right:8px;padding:4px 6px;border:0;transform:translateY(-50%);
  color:var(--t3);background:transparent;font-family:"DM Mono",monospace;font-size:8px;
}
.student-check{
  display:grid!important;grid-template-columns:auto 1fr!important;align-items:flex-start;
  padding:12px;border:1px solid var(--line);border-radius:4px;background:var(--card);
}
.student-check input{width:15px;height:15px;margin:2px 2px 0 0;accent-color:var(--orange)}
.student-check>span{display:flex;flex-direction:column;gap:5px}
.student-check strong{color:var(--t2);font-size:11px;font-weight:500}
.student-check small{color:var(--t3);font-size:9px;line-height:1.5}
.registration-boundary{
  display:flex;align-items:flex-start;gap:9px;margin:0;padding:10px 11px;border:1px solid var(--line-soft);
  border-radius:4px;color:var(--t3);background:var(--bg);font-size:9px;line-height:1.65;
}
.registration-boundary>i{
  flex:0 0 auto;width:6px;height:6px;margin-top:4px;border-radius:50%;
  background:var(--orange);box-shadow:0 0 0 4px var(--orange-soft);
}
.submit-button{
  display:flex;align-items:center;justify-content:space-between;min-height:46px;margin-top:3px;
  padding:0 15px;border:1px solid var(--orange);border-radius:4px;color:#17100b;
  background:var(--orange);font-family:"DM Mono",monospace;font-size:10px;font-weight:500;
}
.submit-button:disabled{cursor:wait;opacity:.55}
.submit-button i{font-size:17px;font-style:normal}
.mode-prompt{margin:0;color:var(--t3);font-size:10px;text-align:center}
.mode-prompt button{padding:4px;border:0;color:var(--orange);background:transparent;font-size:10px}
.success-state{text-align:center}
.success-state>span{
  display:grid;width:44px;height:44px;place-items:center;margin:4px auto 16px;border-radius:50%;
  color:#17100b;background:var(--orange);font-size:20px;
}
.success-state h3{margin:0 0 8px;color:var(--marble);font-family:"Noto Serif TC",serif;font-size:21px;font-weight:500}
.success-state p{margin:0;color:var(--t3);font-size:11px;line-height:1.7}
.verification-state>header{margin-bottom:22px}
.verification-state>header p{
  margin:0 0 9px;color:var(--orange);font-family:"DM Mono",monospace;
  font-size:8px;letter-spacing:.12em;text-transform:uppercase;
}
.verification-state>header h3{
  margin:0 0 7px;color:var(--marble-bright);font-family:"Noto Serif TC",serif;
  font-size:23px;font-weight:500;
}
.verification-state>header>span{color:var(--t3);font-size:10px;line-height:1.6}
.verification-steps{
  display:grid;grid-template-columns:repeat(3,1fr);margin:0 0 24px;padding:0;list-style:none;
}
.verification-steps li{
  position:relative;display:flex;align-items:center;gap:7px;color:var(--t3);
  font-family:"DM Mono",monospace;font-size:8px;
}
.verification-steps li:not(:last-child)::after{
  content:"";position:absolute;top:11px;right:7px;left:31px;height:1px;background:var(--line);
}
.verification-steps b{
  position:relative;z-index:1;display:grid;width:22px;height:22px;place-items:center;
  border:1px solid var(--line);border-radius:50%;background:var(--bg2);font-size:8px;font-weight:400;
}
.verification-steps .active{color:var(--t1)}
.verification-steps .active b{border-color:var(--orange);color:var(--orange)}
.verification-steps .done b{border-color:var(--orange);color:#fff;background:var(--orange)}
.verification-panel{
  padding:22px;border:1px solid var(--line);border-radius:6px;background:var(--card);text-align:center;
}
.verification-icon{
  display:grid;width:40px;height:40px;place-items:center;margin:0 auto 13px;
  border-radius:50%;color:var(--orange);background:var(--orange-soft);
  font-family:"DM Mono",monospace;font-size:16px;
}
.verification-panel h4{margin:0 0 8px;color:var(--t1);font-size:15px;font-weight:500}
.verification-panel p{margin:0 auto 17px;color:var(--t3);font-size:10px;line-height:1.7}
.verification-panel p strong{color:var(--t2);font-weight:500}
.verification-panel .email-delivery-status{
  margin:-5px auto 16px;padding:9px 10px;border:1px solid var(--line);border-radius:4px;
  color:var(--t2);background:var(--bg);font-size:9px;text-align:left;
}
.verification-panel .email-delivery-status[data-tone="success"]{border-color:#31523a;color:#a9d4b2;background:rgba(65,128,77,.08)}
.verification-panel .email-delivery-status[data-tone="error"]{border-color:#5b2b29;color:#e6a29c;background:rgba(170,57,48,.08)}
.verification-panel>small{
  display:block;margin-top:13px;color:var(--t3);font-size:8px;line-height:1.6;text-align:left;
}
.verification-actions{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.verify-primary,.verify-secondary{
  min-height:42px;padding:8px 12px;border-radius:4px;
  font-family:"DM Mono",monospace;font-size:9px;
}
.verify-primary{border:1px solid var(--orange);color:#fff;background:var(--orange)}
.verify-secondary{border:1px solid var(--line);color:var(--t2);background:transparent}
.verify-primary:disabled,.verify-secondary:disabled{cursor:wait;opacity:.5}
.verify-primary.wide{width:100%}
.otp-field{margin:13px 0!important;text-align:left}
.otp-field input{
  margin-top:7px;text-align:center;font-family:"DM Mono",monospace;
  font-size:19px!important;letter-spacing:.45em;
}
#recaptchaContainer{display:flex;justify-content:center;margin-bottom:13px;overflow:hidden}
.form-panel>footer{
  display:flex;align-items:center;justify-content:flex-end;gap:12px;color:#504e48;
  font-family:"DM Mono",monospace;font-size:8px;text-align:right;
}
.auth-download,.auth-install{
  display:flex;align-items:center;gap:7px;min-height:34px;padding:0 10px;border:1px solid #49301f;
  border-radius:4px;color:var(--orange);background:var(--orange-soft);font-family:"DM Mono",monospace;
  font-size:8px;text-decoration:none;white-space:nowrap;
}
.auth-download:hover,.auth-install:hover{border-color:var(--orange);background:rgba(255,106,0,.16)}
.auth-download i,.auth-install i{font-style:normal;font-size:12px}
@media(max-width:900px){
  .auth-shell{display:block;min-height:100dvh}
  .brand-panel{min-height:260px;padding:25px 28px}
  .brand-copy{margin:45px 0 25px}
  .brand-copy h1{font-size:34px}
  .trust-note{display:none}
  .form-panel{min-height:calc(100vh - 260px);padding:18px 18px 24px}
  .form-card{margin:35px auto;padding:30px}
}
@media(max-width:520px){
  .auth-shell{display:flex;min-height:100dvh;flex-direction:column}
  .brand-panel{
    min-height:118px;flex:0 0 auto;padding:calc(16px + env(safe-area-inset-top)) 18px 14px;
    border-right:0;border-bottom:1px solid var(--line);
  }
  .brand svg{height:34px}
  .brand-copy{margin:auto 0 0}
  .brand-copy .eyebrow,.brand-copy>p:last-child{display:none}
  .brand-copy h1{max-width:310px;margin:14px 0 0;font-size:20px;line-height:1.3}
  .form-panel{
    min-height:0;flex:1;padding:12px 16px calc(16px + env(safe-area-inset-bottom));overflow-y:auto;
  }
  .form-top{position:sticky;z-index:2;top:0;padding-bottom:6px;background:var(--bg)}
  .form-card{margin:6px auto 18px;padding:18px 0;border:0;background:transparent}
  .form-heading{margin-bottom:18px}
  .form-heading h2{font-size:25px}
  .account-form{gap:14px}
  .account-form input{height:48px;font-size:16px}
  .submit-button{min-height:50px}
  .student-check{padding:13px}
  .field-grid{grid-template-columns:1fr}
  .verification-state>header h3{font-size:21px}
  .verification-panel{padding:17px 14px}
  .verification-actions{grid-template-columns:1fr}
  .verification-steps li span{display:none}
  .form-panel>footer{flex-direction:column;text-align:center}
}
@media(max-width:360px){
  .brand-copy h1{font-size:18px}
  .form-panel{padding-right:12px;padding-left:12px}
}
@media(max-height:680px) and (max-width:520px){
  .brand-panel{min-height:86px;padding-bottom:10px}
  .brand-copy h1{display:none}
}
@media(display-mode:standalone){
  body{background:#090909}
}