.auth-shell{min-height:100vh;display:flex}.auth-brand{flex:1;min-width:22rem;position:relative;overflow:hidden;background:var(--ink);color:#fff;display:flex;flex-direction:column;justify-content:center;padding:var(--space-8);box-sizing:border-box}.auth-wordmark{position:relative;font-family:var(--font-display);font-size:clamp(3rem,6vw,5.5rem);font-weight:700;line-height:1;letter-spacing:.01em;margin:0 0 var(--space-4)}.auth-tagline{position:relative;font-size:1.15rem;color:var(--muted-on-dark);max-width:24ch;margin:0}.auth-hero{position:absolute;top:0;right:0;bottom:0;left:0;width:100%;height:100%;object-fit:cover;object-position:center 35%;filter:invert(1);opacity:.6;mix-blend-mode:screen}.auth-scrim{position:absolute;top:0;right:0;bottom:0;left:0;background:linear-gradient(115deg,var(--ink) 0%,var(--ink) 40%,rgba(27,36,48,.4) 60%,transparent 82%)}.auth-panel{flex:1;min-width:22rem;display:flex;align-items:center;justify-content:center;padding:var(--space-7) var(--space-5);background:var(--paper);box-sizing:border-box}.auth-panel-inner{width:100%;max-width:26rem}.auth-panel-inner h1{font-size:2.25rem}.terms-toggle{margin:var(--space-4) 0}.terms-toggle summary{cursor:pointer;color:var(--muted);font-size:.85rem}@media (max-width: 860px){.auth-shell{flex-direction:column}.auth-brand{flex:none;min-width:0;min-height:40vh;padding:var(--space-6) var(--space-5)}.auth-wordmark{font-size:2.5rem;margin-bottom:var(--space-2)}.auth-hero{object-position:center 25%}.auth-scrim{background:linear-gradient(180deg,var(--ink) 0%,var(--ink) 55%,rgba(27,36,48,.45) 75%,transparent 100%)}.auth-panel{flex:1;min-width:0;padding:var(--space-6) var(--space-5)}}@media (prefers-reduced-motion: no-preference){.auth-brand{animation:auth-brand-in .4s ease-out}}@keyframes auth-brand-in{0%{opacity:0;transform:translate(-8px)}to{opacity:1;transform:translate(0)}}.stage{min-height:100vh;background:var(--stage-bg);color:var(--stage-text)}.stage-loading{min-height:100vh;display:flex;align-items:center;justify-content:center;background:var(--stage-bg);color:var(--stage-text)}.stage-split{display:flex;align-items:stretch;min-height:100vh}.stage-left{width:40%;min-width:20rem;flex-shrink:0;display:flex;flex-direction:column;align-items:center;text-align:center;gap:var(--space-5);padding:var(--space-6) var(--space-5);box-sizing:border-box}.stage-right{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:var(--space-5);padding:var(--space-6);box-sizing:border-box;border-left:1px solid var(--stage-border)}.stage-meta{font-size:.95rem;color:var(--stage-muted)}.stage-qr-wrap{background:#fff;padding:var(--space-5);border-radius:var(--radius);line-height:0}.stage-fallback{font-size:1.1rem;color:var(--stage-muted);max-width:none}.stage-code{font-family:var(--font-body);font-variant-numeric:tabular-nums;letter-spacing:.08em;color:var(--stage-present);font-size:1.3rem}.stage-counter-num{font-family:var(--font-display);font-size:clamp(3.5rem,8vw,6rem);font-weight:700;line-height:1;margin:0}.stage-counter-label{font-size:1.1rem;color:var(--stage-muted);margin:var(--space-2) 0 0}.stage-feed{list-style:none;margin:0;padding:0;max-width:26rem;width:100%;max-height:16rem;overflow-y:auto}.stage-feed li{padding:var(--space-2) 0;border-bottom:1px solid var(--stage-border);font-size:1rem}.stage-end{margin-top:auto}@media (max-width: 760px){.stage-split{flex-direction:column}.stage-left{width:100%;min-width:0}.stage-right{border-left:none;border-top:1px solid var(--stage-border)}}@media (min-width: 761px){.stage-split{height:100vh;overflow:hidden}}.lecturer-shell{display:flex;min-height:100vh;background:var(--paper);color:var(--ink)}.sidebar-toggle{position:fixed;top:var(--space-4);left:var(--space-4);z-index:20;width:2.25rem;height:2.25rem;border-radius:var(--radius);border:1px solid var(--border);background:var(--paper-raised);color:var(--ink);cursor:pointer;font-size:1rem;line-height:1}.sidebar-toggle:hover{border-color:var(--muted)}.sidebar{width:15rem;flex-shrink:0;box-sizing:border-box;border-right:1px solid var(--border);padding:var(--space-8) var(--space-5) var(--space-5);display:flex;flex-direction:column;overflow:hidden;transition:width .15s ease,padding .15s ease,opacity .15s ease}.sidebar-hidden{width:0;padding-left:0;padding-right:0;opacity:0;border-right:none}.sidebar-nav{display:flex;flex-direction:column;gap:var(--space-2);margin-top:var(--space-7)}.sidebar-link{padding:var(--space-2) var(--space-3);border-radius:var(--radius);color:var(--muted);font-size:1rem;text-decoration:none;white-space:nowrap}.sidebar-link:hover{color:var(--ink);background:var(--border)}.sidebar-link.active{color:var(--ink);background:var(--paper-raised);border:1px solid var(--border);font-weight:600}.sidebar-footer{margin-top:auto;padding-top:var(--space-5)}.lecturer-content{flex:1;min-width:0;padding:var(--space-8) var(--space-6) var(--space-6)}.lecturer-page{max-width:var(--max-content-width)}.about-page{max-width:52rem}.about-page p{max-width:none}.split-page{display:flex;align-items:flex-start;gap:var(--space-8);max-width:62rem}.split-col-left{width:var(--max-content-width);flex-shrink:0;padding-right:var(--space-8);border-right:1px solid var(--border)}.split-col-right{flex:1;min-width:0}.scroll-list{max-height:calc(100vh - 200px);overflow-y:auto}@media (max-width: 760px){.split-page{flex-direction:column;gap:var(--space-6)}.split-col-left{width:100%;padding-right:0;padding-bottom:var(--space-6);border-right:none;border-bottom:1px solid var(--border)}.scroll-list{max-height:none}}.start-session-page{display:flex;flex-direction:column;align-items:center;min-height:70vh;text-align:center}.start-session-page h1{font-weight:800;font-size:clamp(3rem,9vw,6.5rem);line-height:1;margin-bottom:var(--space-6)}.start-session-middle{flex:1;width:100%;max-width:var(--max-content-width);display:flex;flex-direction:column;align-items:center;justify-content:center}.start-session-middle .field label{font-size:1.15rem;font-weight:700;color:var(--ink)}.start-session-middle form{width:100%}@media (max-width: 760px){.sidebar{position:fixed;top:0;right:0;bottom:0;left:0;z-index:15;width:100%;background:var(--paper);border-right:none;overflow-y:auto}.sidebar-hidden{display:none}.mobile-topbar{position:sticky;top:0;z-index:20;background:var(--paper);margin-top:calc(-1 * var(--space-5));margin-left:calc(-1 * var(--space-6));margin-right:calc(-1 * var(--space-6));margin-bottom:var(--space-4);padding-top:var(--space-5);padding-left:var(--space-6);padding-right:var(--space-6);padding-bottom:var(--space-3)}.sidebar-toggle{position:static}.lecturer-content{padding-top:var(--space-5)}.start-session-page h1{font-size:clamp(2.25rem,11vw,6.5rem)}}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.chart{position:relative;max-width:42rem}.chart-svg{width:100%;height:auto;overflow:visible}.chart-gridline{stroke:var(--border);stroke-width:1}.chart-axis-label{fill:var(--muted);font-family:var(--font-body);font-size:.7rem}.chart-area{fill:var(--present);fill-opacity:.1;stroke:none}.chart-line{fill:none;stroke:var(--present);stroke-width:2;stroke-linecap:round;stroke-linejoin:round}.chart-dot{fill:var(--present);stroke:var(--paper);stroke-width:2}.chart-dot-active{fill:var(--present)}.chart-crosshair{stroke:var(--muted);stroke-width:1}.chart-tooltip{position:absolute;top:0;transform:translate(-50%,-100%);background:var(--ink);color:#fff;padding:var(--space-2) var(--space-3);border-radius:var(--radius);font-size:.85rem;white-space:nowrap;pointer-events:none;display:flex;flex-direction:column;gap:2px}.chart-tooltip span{color:var(--muted-on-dark);font-size:.75rem}.chart-table-toggle{margin-top:var(--space-4)}.chart-table-toggle summary{cursor:pointer;color:var(--muted);font-size:.85rem}.chart-table-toggle table{width:100%;border-collapse:collapse;margin-top:var(--space-3)}.chart-table-toggle th,.chart-table-toggle td{text-align:left;padding:var(--space-2) 0;border-bottom:1px solid var(--border);font-size:.9rem}:root{--ink: #1b2430;--ink-soft: #2a3547;--paper: #f7f8fa;--paper-raised: #ffffff;--present: #0f9d6e;--present-on-dark: #34c38e;--attention: #e2a33b;--muted: #5b6472;--muted-on-dark: #9aa5b4;--border: #dde1e7;--border-on-dark: #3a4658;--danger: #c85a4f;--font-display: "Big Shoulders Display", sans-serif;--font-body: "IBM Plex Sans", sans-serif;--space-1: .25rem;--space-2: .5rem;--space-3: .75rem;--space-4: 1rem;--space-5: 1.5rem;--space-6: 2rem;--space-7: 3rem;--space-8: 4rem;--radius: 10px;--max-content-width: 30rem;--stage-bg: var(--ink);--stage-text: #ffffff;--stage-muted: var(--muted-on-dark);--stage-border: var(--border-on-dark);--stage-present: var(--present-on-dark)}.lecturer-shell[data-theme=dark],.page[data-theme=dark]{--paper: #171d27;--paper-raised: #222b39;--ink: #eef1f5;--muted: #9aa5b4;--border: #313d4f;background:var(--paper);color:var(--ink)}.stage[data-theme=light],.stage-loading[data-theme=light]{--stage-bg: var(--paper);--stage-text: var(--ink);--stage-muted: var(--muted);--stage-border: var(--border);--stage-present: var(--present)}*,*:before,*:after{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--font-body);font-size:1rem;line-height:1.5;-webkit-font-smoothing:antialiased}h1,h2,h3{font-family:var(--font-display);font-weight:600;line-height:1.05;margin:0 0 var(--space-3);letter-spacing:.01em}p{margin:0 0 var(--space-4);max-width:38ch}a{color:var(--present)}:focus-visible{outline:3px solid var(--present);outline-offset:2px}@media (prefers-reduced-motion: reduce){*,*:before,*:after{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important}}.page{min-height:100vh;padding:var(--space-7) var(--space-4);display:flex;flex-direction:column;align-items:center}.page-center{justify-content:center}.page-inner{width:100%;max-width:var(--max-content-width)}.page-wide .page-inner{max-width:52rem}.form-narrow{max-width:var(--max-content-width)}.page-header{width:100%;display:flex;align-items:center;justify-content:space-between;margin-bottom:var(--space-6)}@media (max-width: 520px){.page-header{flex-direction:column;align-items:flex-start;gap:var(--space-3)}.page-header .btn-row{width:100%}}.wordmark{font-family:var(--font-display);font-size:1.5rem;font-weight:600;color:var(--ink);margin:0;letter-spacing:.01em}.page h1{font-size:2rem}.field{display:flex;flex-direction:column;gap:var(--space-2);margin-bottom:var(--space-5)}.field label{font-size:.9rem;color:var(--muted)}.field input,.field select{font-family:var(--font-body);font-size:1.05rem;padding:var(--space-3) var(--space-4);border:1px solid var(--border);border-radius:var(--radius);background:var(--paper-raised);color:var(--ink)}.field input:focus-visible,.field select:focus-visible{border-color:var(--present)}.btn{font-family:var(--font-body);font-size:1rem;font-weight:600;padding:var(--space-3) var(--space-5);border-radius:var(--radius);border:none;cursor:pointer;background:var(--present);color:#fff;transition:background-color .12s ease}.btn:hover:not(:disabled){background:#0c8760}.btn:disabled{background:var(--border);color:var(--muted);cursor:not-allowed}.btn-secondary{background:transparent;color:var(--ink);border:1px solid var(--border)}.btn-secondary:hover:not(:disabled){border-color:var(--muted)}.btn-danger{background:var(--danger);color:#fff}.btn-danger:hover:not(:disabled){background:#ab453c}.btn-small{padding:var(--space-2) var(--space-3);font-size:.9rem}.btn-row{display:flex;gap:var(--space-3);flex-wrap:wrap}.alert{color:var(--danger);font-size:.95rem;max-width:none}.list-plain{list-style:none;margin:0 0 var(--space-5);padding:0;border-top:1px solid var(--border)}.list-plain li{display:flex;align-items:center;justify-content:space-between;gap:var(--space-3);padding:var(--space-3) 0;border-bottom:1px solid var(--border)}.list-plain .list-name{font-size:1rem;margin:0}.list-label-link{display:flex;flex-direction:column;color:inherit;text-decoration:none;min-width:0;padding:var(--space-2) var(--space-4);margin:calc(var(--space-2) * -1) calc(var(--space-4) * -1);border-radius:999px;transition:background-color .15s ease,transform .15s ease,box-shadow .15s ease}.list-label-link:hover,.list-label-link:focus-visible{background:var(--paper-raised);box-shadow:0 2px 6px #1b24301f;transform:scale(1.04)}.list-label{display:flex;align-items:center;gap:var(--space-3)}.status-dot{width:.6rem;height:.6rem;border-radius:50%;flex-shrink:0}.status-present{background:var(--present)}.status-absent{background:var(--attention)}.section-label{font-size:.85rem;color:var(--muted);margin:var(--space-6) 0 var(--space-2)}.back-link{display:inline-block;font-size:.9rem;color:var(--muted);text-decoration:none;margin-bottom:var(--space-5)}.back-link:hover{color:var(--ink)}.copy-row{display:flex;gap:var(--space-2)}.big-number{font-family:var(--font-display);font-size:3rem;font-weight:700;line-height:1;margin:0 0 var(--space-4)}.switch{display:inline-flex;align-items:center;gap:var(--space-3);cursor:pointer}.switch input{position:absolute;width:1px;height:1px;opacity:0}.switch-track{position:relative;width:2.75rem;height:1.5rem;flex-shrink:0;border-radius:999px;background:var(--border);transition:background-color .15s ease}.switch-track:before{content:"";position:absolute;top:2px;left:2px;width:1.25rem;height:1.25rem;border-radius:50%;background:var(--paper-raised);box-shadow:0 1px 2px #00000040;transition:transform .15s ease}.switch input:checked+.switch-track{background:var(--present)}.switch input:checked+.switch-track:before{transform:translate(1.25rem)}.switch input:focus-visible+.switch-track{outline:3px solid var(--present);outline-offset:2px}.copy-input{flex:1;min-width:0;font-family:var(--font-body);font-size:.9rem;padding:var(--space-2) var(--space-3);border:1px solid var(--border);border-radius:var(--radius);background:var(--paper-raised);color:var(--ink)}