/* Phone layout: role tab bar at the bottom, thumb-sized controls, bottom-sheet dialogs, safe areas. */
html{-webkit-text-size-adjust:100%}
body{-webkit-tap-highlight-color:transparent;overscroll-behavior-y:none}
@media(max-width:760px){
 header{backdrop-filter:none!important;-webkit-backdrop-filter:none!important;background:var(--card,#fff)!important;padding:calc(10px + env(safe-area-inset-top)) 14px 10px!important}
 header .brand{font-size:19px}
 main{padding:20px 14px calc(110px + env(safe-area-inset-bottom))!important}
 #siteFooter{padding-bottom:calc(120px + env(safe-area-inset-bottom))}
 #a11yToggle{bottom:calc(84px + env(safe-area-inset-bottom));width:46px;height:46px;font-size:22px}
 #a11yPanel{bottom:calc(138px + env(safe-area-inset-bottom))}
 .demo{font-size:12px;padding:6px 10px}
 .button,.secondary,.check,.day{min-height:44px}
 input,select,textarea{font-size:16px!important;min-height:44px}
 h1{font-size:28px!important}
 .stat{padding:12px}
 dialog[open]{margin:auto 0 0 0;width:100%;max-width:100%;max-height:92vh;overflow:auto;border-radius:22px 22px 0 0;padding:22px 18px calc(22px + env(safe-area-inset-bottom))}
 #demoBar,#installBar{font-size:13px}
 #appContent{display:flex;flex-direction:column}
 #appContent>.top{order:1}
 #classPickerPanel{order:2;margin-bottom:14px!important}
 #appContent>.stats{order:3}
 #appContent>.layout{order:4}
 #questionsPanel{order:5}
 #notificationPanel{order:80}
 #pricingPanel{order:90}
 #appContent>.footer{order:99}
}
#installBar{display:flex;gap:10px;align-items:center;justify-content:center;flex-wrap:wrap;padding:10px 14px;background:#e3f2ef;color:#134e4a;font-size:14px;text-align:center}
#installBar[hidden]{display:none!important}
#installBar button{min-height:36px;padding:6px 14px;border-radius:10px;border:0;background:#0f766e;color:#fff;font-weight:600}
#installBar .x{background:transparent;color:inherit;font-size:20px;padding:0 8px}
#pocReset{margin-inline-start:10px;border:1px solid currentColor;background:transparent;color:inherit;border-radius:8px;padding:2px 10px;font-size:inherit;cursor:pointer}
@media(display-mode:standalone){#installBar{display:none!important}}
@media(prefers-color-scheme:dark){
 #installBar{background:#0b3a2e;color:#b9f1e6}
}
/* class materials */
.materialForm{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.materialButtons{display:flex;flex-wrap:wrap;gap:10px;margin:12px 0}
.materialGrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:14px;margin-top:12px}
.materialCard{margin:0;display:flex;flex-direction:column;gap:8px;background:var(--card,#fff);border:1px solid var(--line,#e2e8f0);border-radius:14px;padding:8px;font-size:13px}
.materialCard figcaption{display:flex;flex-direction:column;gap:2px;color:var(--muted,#64748b);word-break:break-word}
.materialCard figcaption b{color:var(--ink,#0f172a);font-size:14px}
.materialThumb{border:0;padding:0;background:none;cursor:zoom-in;display:block;border-radius:10px;overflow:hidden;line-height:0}
.materialThumb img{width:100%;height:130px;object-fit:cover}
.materialActions{display:flex;gap:6px;flex-wrap:wrap}
.materialActions button{padding:6px 12px;font-size:13px;min-height:36px}
.uploaderRow{display:flex;align-items:center;gap:10px;padding:8px 0;border-top:1px solid var(--line,#e2e8f0)}
.uploaderRow input{width:22px;height:22px;min-height:0!important;margin:0}
dialog.viewer{border:0;border-radius:16px;padding:12px;width:min(900px,96vw);max-width:96vw;max-height:94vh;overflow:auto;text-align:center}
dialog.viewer img{max-width:100%;max-height:72vh;border-radius:10px}
dialog.viewer p{margin:10px 0}
@media(max-width:760px){#materialsPanel{order:5}#questionsPanel{order:6!important}dialog.viewer[open]{margin:auto;width:96vw;border-radius:16px}}

/* ---- simple navigation: bottom tabs, role chip, panes ---- */
header .roles[aria-label]{display:none!important}
#roleChip{margin-inline-start:auto;border:1px solid var(--line,#e2e8f0);background:var(--card,#fff);color:var(--ink,#0f172a);border-radius:999px;padding:8px 14px;font-size:14px;font-weight:600;min-height:40px;cursor:pointer}
.tabPane[hidden]{display:none!important}
.tabPane{display:flex;flex-direction:column;gap:16px}
.tabPane>.panel,.tabPane>.layout>.panel,.tabPane details{margin:0!important}
.layout{grid-template-columns:minmax(0,1fr)!important}
#tabNav{position:fixed;inset-inline:0;bottom:0;z-index:30;display:flex;justify-content:space-around;gap:2px;padding:6px 6px calc(6px + env(safe-area-inset-bottom));background:var(--card,#fff);border-top:1px solid var(--line,#e2e8f0);box-shadow:0 -6px 24px #0f172a14}
#tabNav button{flex:1;display:flex;flex-direction:column;align-items:center;gap:2px;border:0;background:transparent;border-radius:12px;padding:6px 2px;font-size:12px;line-height:1.15;color:var(--muted,#64748b);min-height:54px;cursor:pointer}
#tabNav button[aria-current=true]{background:#e3f2ef;color:#0f766e;font-weight:700}
#tabNav .ti{font-size:22px;line-height:1}
@media(min-width:761px){#tabNav{inset-inline:auto;left:50%;transform:translateX(-50%);width:min(640px,calc(100% - 32px));bottom:16px;border-radius:20px;border:1px solid var(--line,#e2e8f0)}main{padding-bottom:120px!important}}
dialog.sheet[open]{display:flex;flex-direction:column;gap:10px;width:min(420px,92vw)}
dialog.sheet h2{margin:0 0 4px}
dialog.sheet button{min-height:48px;text-align:start}
dialog.sheet .plain{border:0;background:transparent;color:var(--muted,#64748b)}
#classPickerPanel>p{display:none}
#classPickerPanel{margin:0!important}
@media(prefers-color-scheme:dark){#tabNav button[aria-current=true]{background:#0b3a2e;color:#5eead4}}
.tabPane>.top,.tabPane>.stats{margin:0!important}
@media(max-width:760px){#subtitle{display:none}.stat{align-items:flex-start;flex-direction:column;gap:4px}.stat strong{font-size:26px}.stat span{font-size:13px}.top{gap:8px}}

details.acc{border:1px solid var(--line,#e2e8f0);border-radius:14px;padding:0 16px;margin:10px 0!important;background:var(--card,#fff)}
details.acc>summary{padding:14px 0;font-weight:700;font-size:17px;cursor:pointer}
details.acc[open]>summary{border-bottom:1px solid var(--line,#e2e8f0);margin-bottom:12px}
details.acc>*:last-child{margin-bottom:16px}
header .brand{white-space:nowrap}
#roleChip{white-space:nowrap}

.segment{display:flex;gap:6px;background:#e8edf5;border-radius:14px;padding:4px}
.segment button{flex:1;border:0;background:transparent;border-radius:11px;padding:10px 8px;font-size:15px;font-weight:600;color:var(--muted,#64748b);min-height:44px;cursor:pointer}
.segment button[aria-pressed=true]{background:#fff;color:#0f766e;box-shadow:0 2px 8px #0f172a14}
.seg-off{display:none!important}
@media(prefers-color-scheme:dark){.segment{background:#1a2440}.segment button[aria-pressed=true]{background:#263248;color:#5eead4}}
#classAdministration>summary{display:none}

/* ---- assistant chat ---- */
#assistantPanel{display:flex;flex-direction:column;gap:10px;padding:14px;min-height:calc(100dvh - 230px)}
.chatHead{display:flex;justify-content:space-between;align-items:center;gap:8px;flex-wrap:wrap}
.modeTag{font-size:12px;background:#e3f2ef;color:#0f766e;border-radius:999px;padding:2px 10px;margin-inline-start:6px}
.ctxChip{border:1px solid var(--line,#e2e8f0);background:var(--card,#fff);color:var(--ink,#0f172a);border-radius:999px;padding:6px 12px;font-size:13px;cursor:pointer;min-height:36px}
#chatLog{flex:1;overflow:auto;display:flex;flex-direction:column;gap:10px;padding:4px 2px;min-height:260px;max-height:calc(100dvh - 380px)}
.bubble{max-width:88%;padding:10px 14px;border-radius:18px;line-height:1.5;font-size:16px;white-space:pre-wrap;word-break:break-word}
.bubble p{margin:0;color:inherit}
.bubble.me{align-self:flex-start;background:linear-gradient(135deg,#0f766e,#4f46e5);color:#fff;border-end-start-radius:6px}
.bubble.bot{align-self:flex-end;background:var(--soft,#f1f5f9);color:var(--ink,#0f172a);border-end-end-radius:6px}
.bubble.typing{opacity:.6;letter-spacing:3px}
.botCard{margin-top:8px;display:flex;flex-direction:column;gap:6px;background:var(--card,#fff);border:1px solid var(--line,#e2e8f0);border-radius:12px;padding:10px 12px;font-size:15px}
.undo{margin-top:8px;border:0;background:transparent;color:#0f766e;font-weight:700;text-decoration:underline;cursor:pointer;padding:4px 0;min-height:0}
#chatChips{display:flex;gap:8px;overflow-x:auto;padding:2px 0}
#chatChips button{flex:0 0 auto;border:1px solid var(--line,#e2e8f0);background:var(--card,#fff);color:var(--ink,#0f172a);border-radius:999px;padding:8px 14px;font-size:14px;cursor:pointer;white-space:nowrap;min-height:38px}
#chatForm{display:flex;align-items:flex-end;gap:8px;margin:0}
#chatInput{flex:1;resize:none;border-radius:22px;padding:11px 16px;max-height:140px;line-height:1.4;margin:0}
#chatForm button{flex:0 0 auto;width:46px;height:46px;border-radius:50%;border:1px solid var(--line,#e2e8f0);background:var(--card,#fff);font-size:20px;cursor:pointer;padding:0}
#chatSend{background:linear-gradient(135deg,#0f766e,#4f46e5)!important;color:#fff;border:0!important}
#chatMic.on{background:#fee2e2!important;border-color:#ef4444!important}
details.moreItem>.panel{border:0!important;box-shadow:none!important;background:none!important;padding:0!important;margin:0!important}
details.moreItem .panel>h2:first-child,details.moreItem>.panel>b:first-child{display:none}
@media(prefers-color-scheme:dark){.bubble.bot{background:#1a2440}.botCard{background:#121a2e}}

@media(max-width:760px){#a11yToggle{bottom:auto!important;top:42%;inset-inline-start:auto!important;inset-inline-end:0;width:30px!important;height:46px!important;border-radius:0 12px 12px 0;font-size:18px!important}#a11yPanel{bottom:auto!important;top:20%;inset-inline-start:auto;inset-inline-end:42px}}