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.signin-card{background:#fff;border:1px solid var(--line);border-radius:8px;padding:42px 40px 30px}
.signin-card h1{font-family:Georgia,serif;font-size:2.2rem;font-weight:400;line-height:1.17;letter-spacing:-.035em;margin:13px 0 18px}
.signin-intro{color:var(--muted);font-size:1rem;line-height:1.7;margin:0 0 30px}
.signin-primary{width:100%;min-height:50px;display:flex;align-items:center;justify-content:center;gap:12px;text-decoration:none;text-align:center}
.signin-account-note{text-align:center;font-size:.8rem;color:var(--muted);line-height:1.65;margin:17px 0 0}
.signin-privacy{text-align:center;border-top:1px solid var(--line);margin-top:29px;padding-top:22px}.signin-privacy .text-link{min-height:32px}
.signin-caption{font-family:Georgia,serif;font-style:italic;color:var(--muted);text-align:center;font-size:.95rem;margin-top:24px}
.signin-code{text-align:center;background:var(--soft);border-radius:5px;padding:17px 12px;margin-bottom:20px}.signin-code .device-code{margin:0;padding:5px 0 0;user-select:all}
.signin-wait{display:flex;align-items:center;justify-content:center;gap:9px;font-size:.8rem;color:var(--muted);margin-top:19px;line-height:1.5}.signin-wait .spinner{flex-shrink:0}
.signin-help{font-size:.8rem;color:var(--muted);margin-top:22px;line-height:1.6}.signin-help summary{cursor:pointer;padding:8px 0}.signin-help p{margin:8px 0 14px}
.signin-card .page-error{margin-bottom:20px;font-size:.875rem;overflow-wrap:anywhere}
@media(max-width:600px){.signin-page{padding:25px 20px}.signin-main{padding:42px 0}.signin-card{padding:30px 24px 22px}.signin-card h1{font-size:2rem}.signin-intro{font-size:.95rem;margin-bottom:25px}.signin-brand .wordmark{font-size:1.4rem}}

/* Sign-in keeps the code selectable when clipboard access is unavailable. */
.lab-entry{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:24px 28px;border:1px solid #bed3c8;background:#e9f1ec;border-radius:8px;margin:0 0 30px}.lab-entry h2{font:1.7rem Georgia,serif;margin:9px 0}.lab-entry p{color:var(--muted);font-size:.9rem}.lab-entry small{display:block;color:var(--green);margin-top:10px}.lab-entry .btn{flex-shrink:0}
.lab-start{padding:26px;display:flex;gap:28px;justify-content:space-between;align-items:center}.lab-start h2{font:1.6rem Georgia,serif;margin:10px 0}.lab-start p{color:var(--muted);font-size:.9rem}.lab-start-actions{display:grid;gap:12px;min-width:240px}.lab-start-actions select{width:100%}
.lab-intro{margin:32px 0 20px}.lab-intro h2{font:1.5rem Georgia,serif}.lab-intro p{color:var(--muted);margin-top:9px;max-width:730px;font-size:.9rem}.lab-methods{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px;align-items:start}.lab-method{padding:25px}.lab-method-head{display:flex;align-items:start;justify-content:space-between;gap:12px}.lab-method-head h3{font:1.3rem/1.4 Georgia,serif}.lab-method-head .status{flex-shrink:0}.lab-formula{margin:18px 0;padding:14px;background:var(--soft);font:1rem/1.6 ui-monospace,SFMono-Regular,Consolas,monospace;overflow-wrap:anywhere}.lab-method>p{font-size:.9rem;line-height:1.7}.lab-trap{margin-top:13px;color:var(--muted)}.lab-example{margin:15px 0}.lab-example summary{cursor:pointer;color:var(--green);padding:12px 0;min-height:44px}.lab-example p{font-size:.875rem}.lab-solution{white-space:pre-wrap;line-height:1.8;font-size:.9rem;margin:17px 0;padding:16px;background:#f5f7f6;overflow-wrap:anywhere}.lab-method .lab-source{margin-top:16px;font-size:.73rem;color:var(--muted)}.lab-checklist{padding:26px;margin-top:28px}.lab-checklist h2{font:1.5rem Georgia,serif}.lab-checklist ul{padding-left:20px;margin:20px 0;max-width:800px}.lab-checklist li{margin:12px 0;line-height:1.65;font-size:.9rem}
@media(max-width:1050px){.lab-methods{grid-template-columns:1fr}.lab-method-head{flex-wrap:wrap}}
@media(max-width:700px){.lab-entry,.lab-start{display:block;padding:22px}.lab-entry .btn{margin-top:20px;width:100%}.lab-start-actions{min-width:0;margin-top:20px}.lab-method{padding:20px}.lab-method .actions>.btn{width:100%}.lab-checklist{padding:20px}.lab-formula{font-size:.9rem}.lab-entry h2{font-size:1.5rem}}
.workspace:focus{outline:none}
.signin-code{padding:17px 16px;text-align:left}
.signin-code-row{display:flex;align-items:center;flex-wrap:wrap;gap:12px;margin-top:10px}
.signin-code .device-code{width:100%;min-width:0;flex:1 1 180px;border:0;border-radius:2px;background:transparent;font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:clamp(1.2rem,5.8vw,1.55rem)!important;letter-spacing:.07em;line-height:1.4;padding:6px 0;min-height:44px;cursor:text}
.copy-code{min-height:46px;padding:10px 13px;flex:1 0 105px}.copy-code.is-copied{color:var(--green);border-color:#7ca797;background:#f6fbf8}
.copy-status{font-size:.8rem;color:var(--muted);line-height:1.5;margin-top:10px;min-height:24px}
.signin-privacy .text-link,.signin-help summary{min-height:44px;align-content:center}
.signin-wait{text-align:left}.signin-wait .spinner{align-self:flex-start;margin-top:3px}

@media(max-width:700px){
  html{-webkit-text-size-adjust:100%;scroll-padding-bottom:calc(85px + env(safe-area-inset-bottom,0px))}
  .app-shell{min-height:100svh}
  .sidebar{position:fixed;top:auto;bottom:0;left:0;right:0;height:auto;z-index:10;padding:8px max(12px,env(safe-area-inset-right,0px)) max(8px,env(safe-area-inset-bottom,0px)) max(12px,env(safe-area-inset-left,0px));border-top:1px solid #40555e}
  .sidebar .nav-section{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:4px}
  .nav-link{justify-content:center;text-align:center;font-size:.825rem;line-height:1.3;min-height:48px;padding:8px 4px}
  .topbar{padding:14px max(16px,env(safe-area-inset-right,0px)) 14px max(16px,env(safe-area-inset-left,0px));gap:10px;min-height:70px}
  .account-button{min-height:44px}.mobile-brand{font-size:1.3rem}
  .workspace{padding:24px max(16px,env(safe-area-inset-right,0px)) calc(100px + env(safe-area-inset-bottom,0px)) max(16px,env(safe-area-inset-left,0px))}
  input,select,textarea,.tutor-composer textarea{font-size:16px!important;max-width:100%}
  .field,select,.course-tile>span,.chapter-description,.question-card,.tutor-panel{min-width:0}
  .text-link,.close-button,.error-close,summary{min-height:44px}.close-button,.error-close{min-width:44px}
  .question-top{flex-wrap:wrap;gap:10px}.question-body,.feedback,.panel-pad{padding:20px}
  .question-body h2,.feedback-answer,.course-tile h2,.chapter-description strong{overflow-wrap:anywhere}
  .numeric-answer{flex-wrap:wrap;gap:10px}.numeric-answer input{flex:1 1 160px;min-width:0}.numeric-answer span{white-space:normal}
  .data-table{width:100%;table-layout:fixed;overflow-wrap:anywhere}
  .coverage-totals{flex-wrap:wrap;gap:16px 24px}.coverage-header>.field{width:100%}.coverage-header select{width:100%}
  .chat-log{max-height:55svh}.tutor-composer .actions>.btn{flex:1 1 140px}
  dialog{max-height:calc(100svh - 32px);overscroll-behavior:contain}
  .signin-page{padding:max(20px,env(safe-area-inset-top,0px)) max(16px,env(safe-area-inset-right,0px)) max(20px,env(safe-area-inset-bottom,0px)) max(16px,env(safe-area-inset-left,0px))}
  .signin-main{margin:0 auto;padding:30px 0 16px}.signin-card{padding:26px 22px 18px}
  .signin-card h1{font-size:clamp(1.75rem,7vw,2.2rem)}.signin-intro{margin-bottom:22px}
  .signin-code .device-code{flex-basis:100%;text-align:center;font-size:1.6rem!important}.copy-code{width:100%}
  .signin-primary{min-height:52px;font-size:1rem}.signin-privacy{margin-top:20px;padding-top:12px}.signin-caption{margin-top:18px}
}