:root{
  --ink:#172033;--muted:#586273;--muted-2:#4e596a;--line:#dde3ed;--paper:#fff;--paper-soft:#f6f3ee;
  --navy:#111827;--navy-2:#23365c;--orange:#f46d2b;--orange-soft:#fff0e9;--blue:#3d63dd;
  --green:#16745f;--shadow:0 22px 70px rgba(20,31,55,.075);--radius-xl:26px;--radius-lg:22px;--radius-md:15px;
}
*{box-sizing:border-box}
html{min-width:320px;background:var(--paper-soft);color:var(--ink);scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;min-height:100vh;background:radial-gradient(circle at 8% 8%,rgba(244,109,43,.08),transparent 28rem),var(--paper-soft);color:var(--ink);font-family:"Segoe UI","Segoe UI Symbol","Arial Unicode MS","Noto Sans",Arial,Helvetica,sans-serif;font-size:16px;line-height:1.6}
a{color:inherit;text-decoration:none}button,input,textarea{font:inherit}button{cursor:pointer}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid rgba(61,99,221,.28);outline-offset:2px}
.skip-link{position:fixed;z-index:100;left:12px;top:10px;padding:9px 12px;border-radius:10px;background:#fff;color:var(--ink);transform:translateY(-150%);box-shadow:0 8px 24px rgba(0,0,0,.12)}.skip-link:focus{transform:none}
.app{min-height:100vh}.topbar{position:sticky;z-index:50;top:0;display:flex;min-height:74px;align-items:center;justify-content:space-between;gap:18px;padding:12px 32px;border-bottom:1px solid rgba(221,227,237,.9);background:rgba(255,255,255,.92);box-shadow:0 8px 30px rgba(20,31,55,.035);backdrop-filter:blur(18px)}
.brand{display:block;color:var(--ink);font-size:21px;font-weight:950;letter-spacing:-.035em;line-height:1.05}.brand span{display:block;margin-top:5px;color:var(--orange);font-size:12px;font-weight:850;letter-spacing:.075em;text-transform:uppercase}.top-status{display:flex;align-items:center}.privacy-pill{display:inline-flex;min-height:34px;align-items:center;gap:8px;padding:7px 11px;border:1px solid var(--line);border-radius:999px;background:#fff;color:var(--muted-2);font-size:15px;font-weight:800;white-space:nowrap}.privacy-pill i{width:8px;height:8px;border-radius:50%;background:var(--green);box-shadow:0 0 0 4px rgba(22,116,95,.11)}.made-by{color:var(--muted-2);font-size:15px;font-weight:700}
.app-layout{display:grid;grid-template-columns:300px minmax(0,1fr);gap:20px;max-width:1800px;min-height:calc(100vh - 74px);margin:0 auto;padding:20px}.sidebar{position:sticky;top:94px;align-self:start;height:calc(100vh - 114px);padding:18px;overflow-y:auto;border:1px solid rgba(221,227,237,.88);border-radius:var(--radius-xl);background:#fff;box-shadow:0 18px 48px rgba(20,31,55,.07)}
.room-card{display:grid;gap:4px;padding:15px;border-radius:18px;background:linear-gradient(145deg,var(--navy),#1f3155);color:#fff}.room-card span{color:#d2d9e5;font-size:15px;font-weight:850;letter-spacing:.08em;text-transform:uppercase}.room-card strong{color:#ff9a70;font-size:27px;letter-spacing:.12em}.room-card small{color:#d7deea;font-size:15px}.progress-block{display:grid;gap:9px;margin:17px 3px}.progress-block>div:first-child{display:flex;justify-content:space-between;color:var(--muted-2);font-size:15px;font-weight:800}.progress-block b{color:var(--ink)}.progress-bar{height:8px;overflow:hidden;border-radius:999px;background:#e5e9f1}.progress-bar i{display:block;width:33.333%;height:100%;border-radius:inherit;background:linear-gradient(90deg,var(--orange),#ff9d74)}
.stage-nav{display:grid;gap:7px}.stage-nav button{display:grid;grid-template-columns:30px minmax(0,1fr) auto;align-items:center;gap:9px;width:100%;min-height:52px;padding:10px 11px;border:0;border-radius:15px;background:transparent;color:#5e6672;text-align:left}.stage-nav button.active{background:linear-gradient(90deg,#fff0e9,#fff8f4);color:var(--ink);box-shadow:inset 4px 0 0 var(--orange)}.stage-nav button:disabled{cursor:not-allowed;opacity:.64}.stage-nav button>span{display:grid;width:27px;height:27px;place-items:center;border-radius:50%;background:#dedbd5;color:#fff;font-size:13px;font-weight:900}.stage-nav button.active>span{background:var(--orange)}.stage-nav button>div{display:grid;gap:2px;min-width:0}.stage-nav strong{font-size:15px;line-height:1.2}.stage-nav small{color:#596273;font-size:13px;line-height:1.3}.stage-nav i{color:#8c5e48;font-size:11px;font-style:normal}.sidebar-note{margin-top:18px;padding:16px;border-top:1px solid var(--line);color:var(--muted-2)}.sidebar-note strong{color:var(--ink);font-size:15px}.sidebar-note p{margin:5px 0 0;font-size:15px;line-height:1.55}
.workspace{min-width:0}.stage-shell{display:grid;grid-template-columns:minmax(620px,1.48fr) minmax(285px,.52fr);min-height:calc(100vh - 114px);overflow:hidden;border:1px solid rgba(221,227,237,.92);border-radius:var(--radius-xl);background:#fff;box-shadow:var(--shadow)}.stage-main{min-width:0;padding:38px 40px 40px}.stage-visual{display:flex;flex-direction:column;gap:16px;padding:24px;border-left:1px solid var(--line);background:linear-gradient(160deg,#f9fbff,#fff8f4)}
.stage-header{margin-bottom:22px;padding-bottom:21px;border-bottom:1px solid var(--line)}.stage-title-row{display:flex;align-items:flex-end;justify-content:space-between;gap:20px}.stage-phase{margin:0 0 7px;color:#b94720;font-size:15px;font-weight:900;letter-spacing:.09em}.stage-title-row h1{margin:0;color:var(--ink);font-size:clamp(36px,3vw,48px);letter-spacing:-.045em;line-height:1.04}.time-chip{flex:0 0 auto;padding:7px 11px;border-radius:999px;background:var(--orange-soft);color:#9c3d1e;font-size:15px;font-weight:850}.student-instruction{display:grid;grid-template-columns:120px minmax(0,1fr);gap:18px;margin-bottom:20px;padding:16px 18px;border-left:4px solid var(--orange);border-radius:0 16px 16px 0;background:#fff8f4}.student-instruction span{color:#9c3d1e;font-size:15px;font-weight:900;letter-spacing:.06em;text-transform:uppercase}.student-instruction p{margin:0;color:#374151;font-size:16px;line-height:1.62}
.context-card{display:grid;grid-template-columns:minmax(260px,.95fr) minmax(0,1.05fr);gap:0;overflow:hidden;margin:0 0 20px;border:1px solid var(--line);border-radius:var(--radius-lg);background:#fff;box-shadow:0 12px 34px rgba(20,31,55,.045)}.trip-visual{position:relative;min-height:255px;overflow:hidden;background:#dce6ee}.trip-visual img{display:block;width:100%;height:100%;min-height:255px;object-fit:cover;object-position:center center}
.context-copy{padding:24px}.badge{display:inline-flex;padding:5px 9px;border-radius:999px;background:#eef2ff;color:#334bb2;font-size:12px;font-weight:900;letter-spacing:.08em}.context-copy h2{margin:15px 0 8px;color:var(--ink);font-size:26px;letter-spacing:-.03em}.context-copy p{margin:0;color:var(--muted-2);font-size:16px;line-height:1.62}.context-facts{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}.context-facts span{padding:7px 10px;border:1px solid var(--line);border-radius:999px;background:#f8fafc;color:#4b5563;font-size:14px;font-weight:800}
.exercise-routes{display:grid;gap:12px}.exercise-route-card{overflow:hidden;border:1px solid var(--line);border-radius:var(--radius-lg);background:#fff;box-shadow:0 12px 34px rgba(20,31,55,.045)}.exercise-route-card>summary{display:grid;grid-template-columns:minmax(0,1fr) auto 24px;gap:14px;align-items:center;padding:19px 21px;cursor:pointer;list-style:none}.exercise-route-card>summary::-webkit-details-marker{display:none}.exercise-route-card>summary span{color:var(--ink);font-size:17px;font-weight:900}.exercise-route-card>summary small{color:#596273;font-size:15px;font-weight:700}.exercise-route-card>summary::after{content:"+";color:#9c3d1e;font-size:22px;line-height:1}.exercise-route-card[open]>summary{border-bottom:1px solid var(--line);background:#fffaf7}.exercise-route-card[open]>summary::after{content:"−"}.exercise-route-body{padding:20px 21px 22px}.exercise-instruction{margin:0 0 15px;color:#465160;font-size:16px;line-height:1.62}.lesson-field{margin:0;padding:16px;border:1px solid #d6dde7;border-radius:16px;background:#fff}.lesson-field legend{padding:0}.field-label{display:block;margin-bottom:13px;color:#313b4a;font-size:16px;font-weight:800;line-height:1.5}.radio-control{display:flex;align-items:center;gap:11px;margin-top:9px;padding:12px 13px;border:1px solid #cbd4df;border-radius:13px;background:#fbfcfe;color:#374151;font-size:16px;cursor:pointer}.radio-control:has(input:checked){border-color:#ef9b76;background:#fff5ef}.radio-control input{width:18px;height:18px;margin:0;accent-color:var(--orange)}.text-input{display:block;width:100%;min-height:118px;padding:13px 14px;border:1px solid #cbd4df;border-radius:13px;background:#fbfcfe;color:var(--ink);font-size:16px;line-height:1.55;resize:vertical}.text-input:focus{border-color:#f08b61;background:#fff;box-shadow:0 0 0 4px rgba(244,109,43,.1);outline:0}
.teacher-gate{display:flex;align-items:center;justify-content:space-between;gap:22px;margin-top:24px;padding:20px;border:1px solid #e1e5ec;border-radius:18px;background:#f8faff}.gate-copy{min-width:0}.gate-copy>span{display:block;margin-bottom:4px;color:#9c3d1e;font-size:13px;font-weight:900;letter-spacing:.08em}.gate-copy strong{display:block;color:var(--ink);font-size:17px}.gate-copy p{max-width:720px;margin:6px 0 0;color:var(--muted-2);font-size:15px;line-height:1.55}.locked-btn{display:inline-flex;flex:0 0 auto;align-items:center;gap:8px;min-height:46px;padding:10px 14px;border:1px solid #d5dbe4;border-radius:14px;background:#eef1f5;color:#596273;font-size:15px;font-weight:850;cursor:not-allowed}.locked-btn span{display:grid;width:25px;height:25px;place-items:center;border-radius:50%;background:#c7cbd2;color:#fff;font-size:12px}.locked-btn b{color:#8a7468;font-size:10px}
.demo-outro{margin-top:34px;padding:28px 30px;border-radius:24px;background:linear-gradient(145deg,var(--navy),var(--navy-2));color:#fff}.demo-outro .eyebrow{margin:0 0 11px;color:#ffb293;font-size:13px;font-weight:900;letter-spacing:.1em}.demo-outro h2{max-width:830px;margin:0;color:#fff;font-size:clamp(27px,2.5vw,36px);letter-spacing:-.035em;line-height:1.18}.demo-outro>p:not(.eyebrow){max-width:800px;margin:12px 0 0;color:#e0e5ec;font-size:16px;line-height:1.62}.outro-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px}.btn{display:inline-flex;min-height:47px;align-items:center;justify-content:center;padding:11px 16px;border:1px solid transparent;border-radius:14px;font-size:15px;font-weight:900}.btn.primary{background:linear-gradient(135deg,var(--orange),#f04f24);color:#fff;box-shadow:0 14px 30px rgba(240,79,36,.22)}.btn.secondary{border-color:rgba(255,255,255,.26);background:transparent;color:#fff}
.visual-hero{position:relative;display:flex;min-height:220px;flex-direction:column;justify-content:flex-end;overflow:hidden;padding:24px;border-radius:26px;background:linear-gradient(145deg,var(--navy),var(--navy-2) 58%,var(--blue));color:#fff;box-shadow:0 22px 55px rgba(17,24,39,.18)}.visual-hero::before{position:absolute;top:-85px;right:-65px;width:220px;height:220px;border-radius:50%;background:linear-gradient(135deg,var(--orange),#ffc0a9);content:"";opacity:.34}.visual-hero::after{position:absolute;bottom:-70px;left:-45px;width:150px;height:150px;border-radius:32px;background:linear-gradient(135deg,#7da0ff,#dfe7ff);content:"";opacity:.18;transform:rotate(18deg)}.visual-hero>*{position:relative;z-index:1}.visual-kicker{color:#ffc5ac;font-size:13px;font-weight:900;letter-spacing:.09em}.visual-route{display:flex;gap:7px;margin:26px 0 34px}.visual-route i{height:5px;flex:1;border-radius:999px;background:rgba(255,255,255,.2)}.visual-route i:first-child{background:#ff8f62}.visual-hero h2{margin:0 0 8px;font-size:28px;letter-spacing:-.035em;line-height:1.12}.visual-hero p{margin:0;color:#e0e5ec;font-size:15px;line-height:1.55}.visual-note{display:grid;grid-template-columns:38px minmax(0,1fr);gap:12px;padding:17px;border:1px solid rgba(221,227,237,.94);border-radius:20px;background:rgba(255,255,255,.94)}.visual-note>span{display:grid;width:36px;height:36px;place-items:center;border-radius:50%;background:var(--orange-soft);color:#9c3d1e;font-size:13px;font-weight:900}.visual-note strong{color:var(--ink);font-size:15px;line-height:1.35}.visual-note p{margin:5px 0 0;color:var(--muted-2);font-size:15px;line-height:1.5}
@media(max-width:1100px){.app-layout{grid-template-columns:260px minmax(0,1fr)}.stage-shell{grid-template-columns:1fr}.stage-visual{display:grid;grid-template-columns:1.1fr 1fr 1fr;align-items:stretch;border-top:1px solid var(--line);border-left:0}.visual-hero{min-height:220px}.visual-note{align-content:start}}
@media(max-width:820px){.topbar{min-height:64px;padding:10px 14px}.brand{font-size:18px}.brand span{font-size:11px}.made-by{display:none}.privacy-pill{font-size:13px;min-height:32px}.app-layout{grid-template-columns:1fr;gap:8px;min-height:0;padding:8px}.sidebar{position:relative;top:auto;height:auto;padding:10px;overflow:hidden;border-radius:19px}.room-card,.progress-block,.sidebar-note{display:none}.stage-nav{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:6px}.stage-nav button{display:grid;grid-template-columns:26px minmax(0,1fr);min-width:0;min-height:58px;padding:8px 7px}.stage-nav button>span{width:25px;height:25px}.stage-nav button>div{gap:0}.stage-nav strong{font-size:13px;white-space:nowrap}.stage-nav small,.stage-nav i{display:none}.stage-shell{min-height:0;border-radius:21px}.stage-main{padding:22px}.stage-visual{grid-template-columns:1fr 1fr;padding:18px}.visual-hero{grid-column:1/-1}.stage-title-row h1{font-size:34px}.student-instruction{grid-template-columns:1fr;gap:5px;padding:14px 16px}.context-card{grid-template-columns:1fr}.trip-visual,.trip-visual img{min-height:210px}.teacher-gate{align-items:flex-start;flex-direction:column}.locked-btn{width:100%;justify-content:center}}
@media(max-width:620px){.stage-main{padding:18px 16px 20px}.stage-title-row{align-items:flex-start;flex-direction:column;gap:10px}.stage-title-row h1{font-size:32px}.stage-phase,.time-chip{font-size:13px}.student-instruction p,.context-copy p,.exercise-instruction,.field-label,.radio-control,.text-input,.demo-outro>p:not(.eyebrow){font-size:15px}.context-copy{padding:20px}.context-copy h2{font-size:24px}.trip-visual,.trip-visual img{min-height:185px}.exercise-route-card>summary{grid-template-columns:minmax(0,1fr) 22px;padding:17px}.exercise-route-card>summary span{font-size:16px}.exercise-route-card>summary small{display:none}.exercise-route-card>summary::after{grid-column:2;grid-row:1}.exercise-route-body{padding:17px}.teacher-gate{padding:17px}.gate-copy p{font-size:14px}.demo-outro{padding:24px 20px}.demo-outro h2{font-size:27px}.outro-actions{flex-direction:column}.outro-actions .btn{width:100%}.stage-visual{display:none}}
@media(max-width:370px){.brand{font-size:17px}.brand span{font-size:10px;letter-spacing:.055em}.privacy-pill{padding:6px 9px;font-size:12px}.stage-nav button{grid-template-columns:24px minmax(0,1fr);padding:7px 5px}.stage-nav strong{font-size:12px}.stage-nav button>span{width:23px;height:23px;font-size:11px}.stage-main{padding:16px 13px 18px}.context-copy{padding:18px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}

/* V7.19 legal links */
.demo-legal{display:flex;flex-wrap:wrap;gap:8px 18px;margin:18px 4px 0;padding-top:16px;border-top:1px solid var(--line)}.demo-legal a{min-height:36px;display:inline-flex;align-items:center;color:var(--muted-2);font-size:13px;font-weight:700;border-bottom:1px solid transparent}.demo-legal a:hover{border-color:currentColor}
@media(max-width:620px){.demo-legal{display:grid;gap:2px;margin-top:16px}.demo-legal a{font-size:14px}}