/* Shared visual language. Layout and activity behavior remain in their existing modules. */
body{--ink:var(--ww-outline);--paper:var(--ww-background);--red:var(--ww-ocean-dark);--edge:var(--ww-sky-light);--muted:var(--ww-shadow);background:var(--ww-background);color:var(--ww-text);font-family:'Trebuchet MS','Segoe UI',sans-serif}
body.student-app{--ink:var(--ww-outline);--paper:var(--ww-background);--red:var(--ww-ocean-dark);--edge:var(--ww-sky-light);--muted:var(--ww-shadow);--button-ink:var(--ww-outline);font-family:'Trebuchet MS','Segoe UI',sans-serif}
.student-app :is(h1,h2,h3,.brand,.menu-brand){font-family:'Trebuchet MS','Segoe UI',sans-serif;font-weight:900}
body .topbar{background:var(--ww-panel);border-bottom:3px solid var(--ww-outline);backdrop-filter:none;box-shadow:0 4px 0 var(--ww-sky-light);color:var(--ww-text)}
.student-app .brand-mark{color:var(--ww-ocean)}
.student-app.student-app :is(button,.button,.site-menu nav a,.chapter-navigation summary){border-color:var(--ww-outline);border-radius:12px 4px 12px 4px;box-shadow:3px 4px 0 var(--ww-shadow)}
.student-app.student-app :is(button,.button):disabled{transform:none;box-shadow:1px 2px 0 var(--ww-shadow);cursor:default}
.student-app.student-app .student-account-button{--button-color:var(--ww-sun);--button-ink:var(--ww-text);max-width:260px;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;display:block}
.student-app.student-app .student-sync-status{--button-color:var(--ww-panel);--button-ink:var(--ww-text);max-width:225px;min-width:0;font-size:12px;line-height:1.3;white-space:normal;padding:9px 12px}
.student-app .header-actions{min-width:0;gap:12px;flex-wrap:wrap;justify-content:flex-end}.student-app .passport:empty{display:none}
.student-app :is(.reader-sidebar,.reader-paper,.roadmap-world,.course-theory,.course-practice,.course-languages,.table-scroll,.student-login-dialog,.native-language-dialog,.site-menu,.learning-summary){border:3px solid var(--ww-outline);border-radius:20px 6px 20px 6px;box-shadow:5px 6px 0 var(--ww-shadow);background:var(--ww-panel);color:var(--ww-text)}
.student-app :is(.reader-sidebar,.course-languages,.learning-summary){background:var(--ww-cream)}
.student-app .roadmap-world{background:var(--ww-panel)}.student-app .roadmap-world:nth-child(4n+2){background:var(--ww-background)}.student-app .roadmap-world:nth-child(4n+3){background:var(--ww-cream)}
.student-app .roadmap-world li a{background:var(--ww-sky-light);border-color:var(--ww-outline);box-shadow:3px 4px 0 var(--ww-shadow)}.student-app .roadmap-world li:nth-child(even) a{background:var(--ww-leaf)}
.student-app .course-tile{border:3px solid var(--ww-outline);border-radius:20px 6px 20px 6px;box-shadow:5px 6px 0 var(--ww-shadow);color:var(--ww-text);background:var(--ww-sun)}.student-app .course-tile:nth-child(4n+2){background:var(--ww-sky-light)}.student-app .course-tile:nth-child(4n+3){background:var(--ww-leaf)}.student-app .course-tile:nth-child(4n+4){background:var(--ww-orange)}
.student-app .course-theory summary{background:var(--ww-sun);color:var(--ww-text)}.student-app .course-practice{background:var(--ww-background)}
.student-app .course-question,.student-app .mission-question{background:var(--ww-panel);border:2px solid var(--ww-outline);border-radius:12px 4px 12px 4px;color:var(--ww-text)}
.student-app .lesson-objective{background:var(--ww-leaf);border-color:var(--ww-outline)}.student-app .book-content th{background:var(--ww-ocean-dark);color:var(--ww-panel)}
.student-app .site-menu::backdrop,.student-login-dialog::backdrop{background:#26384999;backdrop-filter:none}
.student-app .site-menu .menu-heading{background:var(--ww-panel);border-color:var(--ww-outline)}
.student-app .library-list>a{border:3px solid var(--ww-outline);background:var(--ww-cream);box-shadow:3px 4px 0 var(--ww-shadow);border-radius:14px 4px 14px 4px}.student-app .library-list>a:nth-child(even){background:var(--ww-background)}
body:not(.student-app) :is(button,.button){border:2px solid var(--ww-outline);border-radius:10px 4px 10px 4px;box-shadow:3px 4px 0 var(--ww-shadow);background:var(--ww-sun);color:var(--ww-text)}
body:not(.student-app) :is(.editor-card,.gemini-import,.learning-order-panel,.import-panel,.lesson-preview){border:3px solid var(--ww-outline);border-radius:18px 5px 18px 5px;box-shadow:4px 5px 0 var(--ww-shadow)}
body:not(.student-app) .lesson-choice.selected{background:var(--ww-ocean-dark);color:var(--ww-panel)}
[hidden]{display:none!important}
@media(max-width:900px){
 body.student-app .topbar{display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:10px 12px;padding:12px 16px;min-height:0;width:100%;box-sizing:border-box}
 .student-app .header-actions{display:contents}
 .student-app .brand{grid-column:1;grid-row:1;font-size:25px;gap:6px;min-width:0}.student-app .brand-mark{width:28px;height:28px}
 .student-app.student-app #menu-toggle{grid-column:2;grid-row:1;padding:9px 12px;min-height:44px;font-size:12px;gap:10px;justify-self:end;margin:0}
 .student-app.student-app .student-account-button{grid-column:1;grid-row:2;justify-self:start;width:100%;max-width:100%;min-height:44px;max-height:44px;font-size:12px;padding:10px 9px;margin:0;line-height:20px}
 .student-app.student-app .student-sync-status{grid-column:2;grid-row:2;display:block;justify-self:end;width:136px;max-width:39vw;min-height:44px;max-height:44px;overflow:hidden;white-space:nowrap;text-overflow:ellipsis;font-size:11px;padding:10px 8px;margin:0;line-height:20px}
 .student-app .passport{display:none}
 .student-app main{padding:24px 16px 40px;min-width:0}.student-app main>*{min-width:0;max-width:100%;box-sizing:border-box}
 .student-app .roadmap-world{padding:18px 14px}.student-app .roadmap-world-heading{flex-wrap:wrap;gap:12px}.student-app .roadmap-world-heading h2{font-size:21px;overflow-wrap:anywhere;flex:1;min-width:0}.student-app .roadmap-world ol{padding-left:12px;margin-left:2px}
 .student-app .course-heading{flex-wrap:wrap;gap:14px}.student-app .course-heading h1{overflow-wrap:anywhere}.student-app .course-body{grid-template-columns:minmax(0,1fr)}.student-app .course-practice{position:static;padding:18px 14px}.student-app .course-languages{gap:9px;padding:12px}
 .student-app.student-app .course-languages button{padding:9px 12px;font-size:13px}.student-app .reader-paper{padding:22px 15px}.student-app .reader-toolbar,.student-app .reader-bottom{flex-wrap:wrap;gap:10px}.student-app .book-content h1{font-size:30px;overflow-wrap:anywhere}
 .student-app :is(.student-login-dialog,.native-language-dialog){box-sizing:border-box;width:calc(100% - 28px);max-width:480px;padding:20px;max-height:calc(100dvh - 32px);overflow:auto}
 .student-app .hero{padding:18px 12px 90px;gap:24px;box-shadow:4px 5px 0 var(--ww-shadow)}.student-app .hero>div:first-child{padding:20px 16px}.student-app .hero h1{font-size:clamp(30px,8vw,48px);letter-spacing:-1.4px}.student-app .hero h1 em{padding:3px 5px}.student-app .hero p{font-size:15px}.student-app.student-app .hero-actions :is(button,.button){font-size:12px;padding:9px 8px}.student-app .hero-actions #student-continue{font-size:14px}.student-app .channel-panel{transform:none;box-shadow:4px 6px 0 var(--ww-shadow)}
 body:not(.student-app) .topbar{flex-wrap:wrap;gap:10px;padding:14px}body:not(.student-app) .topbar .brand{font-size:25px}
}
@media(max-width:380px){.student-app .brand{font-size:22px}.student-app .brand-mark{width:25px;height:25px}.student-app .hero>div:first-child{padding:18px 12px}.student-app .hero h1{font-size:29px}.student-app .learning-summary{padding:17px 14px}}
@media(prefers-reduced-motion:reduce){.student-app :is(button,.button,.course-tile){transition:none;transform:none}}

.student-app .student-sync-status:empty{display:none!important}
.student-app .about-dialog{background:var(--ww-panel);color:var(--ww-text);border:3px solid var(--ww-outline);border-radius:20px 6px 20px 6px;box-shadow:5px 6px 0 var(--ww-shadow)}
.student-app .about-heading{background:var(--ww-panel);border-color:var(--ww-outline)}
.maintenance-coders{display:flex;align-items:center;justify-content:center;gap:14px;padding:28px 12px;margin:12px 0 24px;background:var(--ww-sky-light);border:3px solid var(--ww-outline);border-radius:16px}.maintenance-coders img{width:64px;height:64px}#student-guest{width:100%;margin-top:16px;background:var(--ww-sun);color:var(--ww-outline)}
/* Student space: local progress summary, with account actions in the main menu. */
.student-app.student-app .student-account-button{max-width:210px;min-height:40px;padding:9px 12px;font-size:12px;line-height:1.25}
.student-profile-dialog{width:calc(100% - 28px);max-width:550px;max-height:88dvh;padding:0;border:3px solid var(--ww-outline);border-radius:22px 6px 22px 6px;background:var(--ww-cream);color:var(--ww-text);box-shadow:7px 8px 0 var(--ww-shadow);overflow:hidden}
.student-profile-dialog::backdrop{background:#26384999}
.student-profile-heading{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:18px 22px;border-bottom:3px solid var(--ww-outline);background:var(--ww-sun)}
.student-profile-heading h2{margin:0;font-size:24px;line-height:1.2}
.student-profile-close{flex-shrink:0;width:42px;height:42px;padding:0;font-size:26px;--button-color:var(--ww-coral)}
.student-profile-body{max-height:calc(88dvh - 90px);overflow-y:auto;overscroll-behavior:contain;padding:24px;scrollbar-color:var(--ww-ocean-dark) var(--ww-sand)}
.student-profile-identity{display:flex;align-items:center;gap:16px;margin-bottom:22px;min-width:0}
.student-profile-identity h3{margin:0 0 5px;font-size:23px;overflow-wrap:anywhere}
.student-profile-identity p{margin:0;font-size:13px}
.student-profile-stats{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-bottom:20px}
.student-profile-stats>div{display:grid;justify-items:center;gap:7px;text-align:center;padding:16px 10px;border:2px solid var(--ww-outline);border-radius:12px 4px;background:var(--ww-sky-light);box-shadow:3px 3px 0 var(--ww-outline)}
.student-profile-stats>div+div{background:var(--ww-orange)}
.student-profile-stats strong{font-size:30px;line-height:1.1}
.student-profile-stats span{font-size:12px;font-weight:800}
.student-profile-progress{padding:16px;border:2px solid var(--ww-outline);border-radius:12px 4px;background:var(--ww-panel)}
.student-profile-progress h3{font-size:17px;margin:0 0 12px}
.student-profile-progress p{font-size:13px;margin:10px 0}
.student-profile-progress progress{appearance:none;display:block;width:100%;height:18px;border:2px solid var(--ww-outline);border-radius:5px;overflow:hidden;background:var(--ww-sand)}
.student-profile-progress progress::-webkit-progress-bar{background:var(--ww-sand)}
.student-profile-progress progress::-webkit-progress-value{background:var(--ww-grass)}
.student-profile-progress progress::-moz-progress-bar{background:var(--ww-grass)}
.student-profile-links{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:22px}
.student-profile-links button{grid-column:1/-1;--button-color:var(--ww-grass-light)}
.student-profile-links a{font-size:13px;text-align:center;--button-color:var(--ww-sky-light)}
.student-profile-links a:last-child{--button-color:var(--ww-orange)}
.student-app .site-menu .student-menu-signout{display:flex;width:100%;margin-top:18px;--button-color:var(--ww-coral);color:var(--ww-outline)}
@media(max-width:420px){.student-profile-body{padding:18px}.student-profile-heading{padding:16px}.student-profile-heading h2{font-size:21px}.student-profile-links{grid-template-columns:1fr}.student-app.student-app .student-account-button{max-width:100%;font-size:11px}}

/* Only actionable connection problems are shown to learners. */
.student-connection-notice{margin:12px auto;padding:14px 18px;max-width:1100px;width:calc(100% - 32px);box-sizing:border-box;border:3px solid var(--ww-outline,#263849);border-radius:12px;background:var(--ww-sun,#F8D65B);color:var(--ww-text,#263849);box-shadow:4px 4px 0 var(--ww-outline,#263849);font-weight:700;line-height:1.5}
.student-connection-notice[hidden]{display:none}
/* Family access: fixed close control and a scrollable, responsive body. */
.student-app .student-login-dialog.family-access{box-sizing:border-box;width:calc(100% - 32px);max-width:560px;max-height:calc(100dvh - 32px);padding:0;margin:auto;overflow:hidden;border:3px solid var(--ww-outline);border-radius:22px 8px 22px 8px;background:var(--ww-cream);box-shadow:6px 7px 0 var(--ww-shadow)}
.student-login-dialog.family-access[open]{display:flex;flex-direction:column}
.family-access-heading{display:grid;grid-template-columns:minmax(0,1fr) 44px;align-items:start;gap:18px;padding:26px 28px 22px;background:var(--ww-sun);border-bottom:3px solid var(--ww-outline);flex-shrink:0}
.family-access-eyebrow{display:block;font-size:12px;font-weight:900;letter-spacing:.1em;text-transform:uppercase;margin-bottom:10px}
.student-app .family-access-heading h2{font-size:clamp(23px,4vw,30px);line-height:1.18;letter-spacing:-.035em;margin:0;overflow-wrap:normal}
.student-app.student-app .family-access .student-login-close{float:none;display:grid;place-items:center;width:44px;height:44px;min-width:44px;min-height:44px;padding:0;margin:0;font-size:28px;line-height:1;--button-color:var(--ww-coral);background:var(--ww-coral);color:var(--ww-outline)}
.family-access-body{min-height:0;overflow-y:auto;overscroll-behavior:contain;padding:26px 28px 22px;scrollbar-color:var(--ww-ocean) var(--ww-cream);scrollbar-width:thin}
.family-access-label{display:block;font-size:13px;font-weight:900;color:var(--ww-ocean-dark)}
.student-login-dialog.family-access p{font-size:16px;line-height:1.6;margin:10px 0 20px}
.student-app.student-app .family-access :is(#student-google,#student-guest){box-sizing:border-box;width:100%;max-width:100%;min-width:0;min-height:52px;white-space:normal;overflow-wrap:break-word;text-align:center;font-size:16px;line-height:1.35;padding:13px 16px;gap:12px;transform:none}
.student-app.student-app .family-access #student-google{display:flex;justify-content:center;align-items:center;background:var(--ww-panel);--button-color:var(--ww-panel);color:var(--ww-text)}
.family-google-icon{width:22px;height:22px;flex:0 0 22px}
.family-access #student-google span{min-width:0}
.student-login-dialog.family-access #student-auth-message:empty{display:none}
.student-login-dialog.family-access #student-auth-message{margin:16px 0 0;padding:12px;border:2px solid var(--ww-outline);border-radius:8px;background:var(--ww-panel);font-size:14px}
.family-guest-option{margin-top:26px;padding-top:22px;border-top:2px solid var(--ww-outline)}
.student-app .family-guest-option h3{font-size:18px;line-height:1.3;margin:0}
.student-login-dialog.family-access .family-guest-option p{font-size:14px;margin:8px 0 16px}
.student-app.student-app .family-access #student-guest{background:var(--ww-sky-light);--button-color:var(--ww-sky-light);color:var(--ww-text)}
.family-access .student-legal-links{display:flex;flex-wrap:wrap;justify-content:center;gap:8px 20px;margin:22px 0 0;padding-top:4px}
.family-access .student-legal-links a{display:inline-flex;align-items:center;min-height:36px;max-width:100%;font-size:12px;line-height:1.4;text-align:center;text-underline-offset:3px;overflow-wrap:anywhere}
@media(max-width:480px){.student-app .student-login-dialog.family-access{width:calc(100% - 24px);max-height:calc(100dvh - 24px);border-radius:18px 6px 18px 6px;box-shadow:4px 5px 0 var(--ww-shadow)}.family-access-heading{padding:20px 18px 18px;gap:12px}.family-access-body{padding:20px 18px}.student-login-dialog.family-access p{font-size:15px}.student-app.student-app .family-access :is(#student-google,#student-guest){font-size:15px;padding:12px;gap:10px}.family-access .student-legal-links{gap:6px 14px}}
@media(max-height:480px){.family-access-heading{padding:12px 18px}.family-access-eyebrow{margin-bottom:4px}.student-app .family-access-heading h2{font-size:22px}.family-access-body{padding:16px 18px}}
.student-customize{margin:20px 0;padding:20px;background:#fff6df;border:2px solid #263849;border-radius:18px;color:#263849;display:grid;gap:10px}
.student-customize h3,.student-customize p{margin:0}
.student-customize>label,.student-customize legend{font-weight:800}
.student-customize input[name=nickname]{box-sizing:border-box;width:100%;min-width:0;padding:12px;border:2px solid #263849;border-radius:10px;background:white;color:#263849;font:inherit}
.student-customize input[readonly]{background:#edf2f4;color:#45566a}
.student-customize .nickname-help{font-size:.85rem;line-height:1.5}
.student-customize fieldset{border:0;padding:0;margin:6px 0;min-width:0}
.student-avatar-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;margin-top:10px}
.student-avatar-choice{position:relative;display:flex;align-items:center;justify-content:center;min-height:62px;border:2px solid #263849;border-radius:12px;background:#fff;cursor:pointer;box-shadow:0 3px 0 #34465b}
.student-avatar-choice input{position:absolute;opacity:0;width:100%;height:100%;margin:0;cursor:pointer}
.student-avatar-choice:has(input:checked){background:#83ddf5;outline:3px solid #087fc1;outline-offset:1px;box-shadow:none}
.student-avatar-choice:has(input:focus-visible){outline:3px dashed #6c4a9b;outline-offset:3px}
.student-avatar-choice img{pointer-events:none;width:40px;height:40px}
.student-customize button{padding:12px 16px;background:#087fc1;color:#fff;border:2px solid #263849;border-radius:10px;font:inherit;font-weight:800;cursor:pointer}
.student-customize button:disabled{opacity:.6;cursor:wait}
.student-profile-message{font-size:.9rem;line-height:1.5;overflow-wrap:anywhere}
@media(max-width:380px){.student-customize{padding:12px}.student-avatar-grid{gap:7px}.student-avatar-choice{min-height:54px}}
.student-customize[hidden]{display:none}
.student-profile-identity>div{flex:1;min-width:0;display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.student-profile-identity>div>p{flex-basis:100%}
.student-profile-identity #student-profile-name{overflow-wrap:anywhere;margin:0}
.student-customize-toggle{flex-shrink:0;display:inline-flex;align-items:center;justify-content:center;width:42px;height:42px;padding:8px;border:2px solid var(--ww-outline);border-radius:50%;background:var(--ww-sun);cursor:pointer}
.student-customize-toggle:hover,.student-customize-toggle[aria-expanded=true]{background:var(--ww-sky-light)}
.student-customize-toggle:focus-visible{outline:3px solid var(--ww-ocean);outline-offset:3px}
.student-customize-toggle img{width:24px;height:24px}
.lesson-loading{min-height:55vh;display:grid;place-items:center;padding:36px 16px;box-sizing:border-box}
.lesson-loading-card{width:min(100%,480px);box-sizing:border-box;padding:clamp(22px,5vw,40px);border:3px solid #263849;border-radius:20px 6px 20px 6px;background:#fff6df;color:#263849;box-shadow:7px 7px 0 #34465b;text-align:center}
.lesson-loading-tag{display:block;width:max-content;margin:0 auto 20px;padding:5px 12px;border:2px solid #263849;background:#f8d65b;font-size:12px;font-weight:900;letter-spacing:.1em;text-transform:uppercase}
.lesson-loading-card>img{display:block;margin:0 auto 18px;width:56px;height:56px}
.lesson-loading-card h1{font-size:clamp(24px,5vw,34px);line-height:1.15;margin:0 0 16px;overflow-wrap:anywhere}
.lesson-loading-card p{font-size:16px;line-height:1.5;margin:0 0 22px}
.lesson-loading-track{height:26px;border:3px solid #263849;background:#d8eaf0;overflow:hidden;position:relative;box-shadow:3px 3px 0 #34465b}
.lesson-loading-track>span{position:absolute;inset:0 auto 0 0;width:34%;background:repeating-linear-gradient(90deg,#55c957 0 16px,#278844 16px 19px);border-right:3px solid #263849;animation:lesson-load 1.8s steps(12,end) infinite alternate}
.lesson-loading-home{display:block;width:max-content;max-width:100%;margin:24px auto 0;font-weight:800;color:#07558a;text-underline-offset:4px}
.lesson-loading-retry{background:#f8d65b!important;color:#263849!important;border:2px solid #263849!important}
@keyframes lesson-load{from{left:0}to{left:65%}}
@media(prefers-reduced-motion:reduce){.lesson-loading-track>span{animation:none;left:33%}}