/* Search and tabs */
.searchbar{position:relative}
.searchbar i{position:absolute;left:13px;top:50%;transform:translateY(-50%);color:#8d99aa;font-size:13px}
.searchbar .input{padding-left:38px;background:var(--surface-2)}
.chip{white-space:nowrap;border:1px solid var(--line);background:#fff;color:#667489;border-radius:7px;padding:8px 10px;font-size:11px;font-weight:700}
.chip.active{background:var(--text);color:#fff;border-color:var(--text)}
.tabs{display:grid;grid-template-columns:repeat(2,1fr);gap:2px;background:var(--surface-3);border:1px solid #e7ecf2;padding:3px;border-radius:9px;margin-top:14px}
.tab{border:0;background:transparent;min-height:38px;border-radius:7px;color:#718095;font-size:11.5px;font-weight:750}
.tab.active{background:#fff;color:var(--text);box-shadow:0 1px 2px rgba(25,40,62,.08)}
.profile-name{margin:10px 0 3px;font-size:20px;font-weight:800;letter-spacing:-.035em}
.profile-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:14px}
.stat{min-width:0;text-align:center;background:#fff;border:1px solid var(--line);border-radius:var(--radius-sm);padding:11px 7px}
.stat strong{display:block;overflow:hidden;text-overflow:ellipsis;font-size:14px;font-weight:800;letter-spacing:-.025em}
.stat span{display:block;margin-top:2px;font-size:10px;color:var(--muted)}
.question-block{border:1px solid var(--line);background:#fff;border-radius:var(--radius);padding:14px}
.question-actions{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px}
.question-number{font-size:10px;color:var(--muted);font-weight:800;letter-spacing:.04em;text-transform:uppercase}
.danger-link{border:0;background:none;color:var(--danger);font-weight:750;font-size:10.5px}

/* Result */

/* Messaging */
.chat-list-item{display:grid;grid-template-columns:42px minmax(0,1fr) auto;align-items:center;gap:10px;width:100%;padding:12px;border:0;border-bottom:1px solid var(--line);background:#fff;text-align:left;color:var(--text)}
.chat-list-item:last-child{border-bottom:0}
.chat-list-item:hover{background:var(--surface-2)}
.chat-list-item.unread{background:#f5f9ff}
.chat-list-name{display:flex;align-items:center;justify-content:space-between;gap:8px}
.chat-list-name strong{font-size:12.5px}
.chat-list-name span{min-width:18px;height:18px;padding:0 5px;border-radius:9px;background:var(--primary);color:#fff;font-size:9.5px;line-height:18px;text-align:center;font-weight:900}
.chat-preview{margin-top:3px;color:var(--muted);font-size:11px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.chat-list-item.unread .chat-preview{color:var(--text-2);font-weight:700}
.chat-list-time{align-self:start;padding-top:2px;color:var(--muted);font-size:9.5px;white-space:nowrap}
.chat-page{display:grid;grid-template-rows:auto minmax(0,1fr) auto;height:100vh;background:var(--surface-2);padding-bottom:0}
.chat-page .topbar{flex:0 0 auto}
.chat-live-indicator{display:inline-flex;align-items:center;gap:5px;color:var(--success);font-size:10px;font-weight:800}
.chat-live-indicator i{width:7px;height:7px;border-radius:50%;background:currentColor}
.chat-messages{overflow-y:auto;padding:16px 14px 100px;display:flex;flex-direction:column;gap:8px}
.bubble{max-width:min(82%,560px);padding:9px 11px;border:1px solid var(--line);border-radius:10px;background:#fff;color:var(--text);font-size:12px;line-height:1.45;overflow-wrap:anywhere}
.bubble.me{align-self:flex-end;border-color:#c8d9ff;background:#edf4ff}
.bubble.them{align-self:flex-start}
.bubble-time{display:block;margin-top:5px;color:var(--muted);font-size:9px;text-align:right}
.chat-composer{position:fixed;z-index:20;left:0;right:0;bottom:0;display:grid;grid-template-columns:minmax(0,1fr) 44px;align-items:end;gap:8px;padding:10px max(12px,env(safe-area-inset-right)) calc(10px + env(safe-area-inset-bottom)) max(12px,env(safe-area-inset-left));border-top:1px solid var(--line);background:#fff}
.chat-composer textarea{min-height:42px;max-height:120px;resize:none}
.chat-composer .chat-send{width:42px;height:42px}
.chat-empty{margin:auto;display:grid;justify-items:center;gap:6px;color:var(--muted);text-align:center}
.chat-empty i{font-size:28px;color:#a8b4c5}
.chat-empty strong{color:var(--text-2);font-size:13px}
.chat-empty span{font-size:11px}
.chat-inline-loading{margin:auto;color:var(--muted);font-size:11px}
@media(min-width:761px){.chat-composer{left:235px}}

/* Bottom navigation */
.bottom-nav{position:fixed;bottom:0;left:50%;transform:translateX(-50%);z-index:40;width:min(500px,100%);display:grid;grid-template-columns:repeat(var(--nav-count,5),minmax(0,1fr));background:rgba(255,255,255,.98);border-top:1px solid var(--line);padding:5px 6px calc(5px + var(--safe-bottom));backdrop-filter:saturate(120%) blur(8px)}
.nav-item{position:relative;min-width:0;border:0;background:transparent;display:flex;align-items:center;justify-content:center;min-height:54px;color:#8a96a5;border-radius:6px}
.nav-item i{font-size:18px}
.nav-item.active{color:var(--primary)}
.nav-item.active:before{content:"";position:absolute;top:0;width:22px;height:2px;background:var(--primary);border-radius:0 0 2px 2px}
.nav-item.create{width:42px;height:42px;min-height:42px;border-radius:9px;background:var(--primary);color:#fff;margin:5px auto 0}
.nav-item.create:before{display:none}
.nav-item.create .nav-icon-wrap{display:inline-grid;color:#fff}

/* Action sheet */
.sheet-backdrop{position:fixed;inset:0;background:rgba(10,20,34,.34);z-index:10020}
.action-sheet{position:fixed;left:50%;bottom:0;transform:translateX(-50%);z-index:10030;width:min(500px,100%);background:#fff;border:1px solid #cbd7e5;border-radius:12px 12px 0 0;padding:12px 14px calc(16px + var(--safe-bottom));box-shadow:0 -14px 34px rgba(22,34,50,.12)}
.sheet-handle{width:34px;height:3px;background:#d6dde6;border-radius:2px;margin:0 auto 10px}
.action-sheet.confirm-sheet{top:50%;bottom:auto;width:min(490px,calc(100% - 24px));transform:translate(-50%,-50%);border:1px solid #d7e0ec;border-radius:10px;padding:14px;box-shadow:0 18px 46px rgba(11,27,52,.18)}
.confirm-dialog-head{display:flex;align-items:center;gap:9px}.confirm-dialog-head>div{min-width:0}.confirm-dialog-head h3{margin:0;color:#0b244d;font-size:15px;line-height:1.2}.confirm-dialog-icon{width:34px;height:34px;display:grid;place-items:center;flex:0 0 auto;border:1px solid #cddcff;border-radius:7px;background:#f4f7fd;color:#1264e8;font-size:13px}.confirm-dialog-icon.danger{border-color:#efc7cf;background:#fff3f5;color:#b52d43}.confirm-dialog-icon.warning{border-color:#ead8ae;background:#fffaf0;color:#986912}.confirm-dialog-head .icon-btn{width:32px;height:32px;border-radius:6px}.confirm-dialog-message{margin:10px 0 0;color:#52667f;font-size:12.5px;line-height:1.5}.confirm-dialog-facts{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:6px;margin-top:10px}.confirm-dialog-facts>div{display:grid;gap:3px;min-width:0;padding:8px;border:1px solid #dce4ee;border-radius:6px;background:#fafbfd}.confirm-dialog-facts span{font-size:11px;line-height:1.15;color:#78879a;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.confirm-dialog-facts strong{font-size:11px;line-height:1.2;color:#0b244d;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.confirm-dialog-facts.hero{grid-template-columns:1fr;margin-top:12px}.confirm-dialog-facts.hero>div{padding:14px 16px;border-color:#c8d7ea;background:#f7f9fc;text-align:center;gap:5px}.confirm-dialog-facts.hero span{font-size:11px;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:#738197}.confirm-dialog-facts.hero strong{font-size:25px;line-height:1.05;letter-spacing:-.02em;color:#002050;overflow:visible;text-overflow:clip}.confirm-dialog-facts.hero+ .confirm-dialog-note{justify-content:center;text-align:center;margin-top:7px}.confirm-dialog-note{display:flex;align-items:center;gap:7px;margin-top:10px;padding:0;color:#60748c;font-size:11.5px;line-height:1.35}.confirm-dialog-note i{color:#1264e8;font-size:10px}.confirm-dialog-actions{display:grid;grid-template-columns:1fr 1fr;gap:7px;margin-top:11px}.confirm-dialog-actions .btn{min-height:38px;border-radius:7px;font-size:11.5px}
@media(max-width:520px){.action-sheet.confirm-sheet{width:calc(100% - 18px);padding:12px}.confirm-dialog-facts{grid-template-columns:repeat(2,minmax(0,1fr))}.confirm-dialog-actions{grid-template-columns:1fr 1fr}.confirm-dialog-head h3{font-size:14px}}

/* Feedback / setup */
.empty,.empty-state{padding:34px 16px;text-align:center;color:var(--muted)}
.empty i,.empty-state i{font-size:27px;color:#adb7c5;margin-bottom:11px}
.empty h4{margin:0 0 5px;color:var(--text)}
.empty-state strong{display:block;color:var(--text);margin-bottom:5px;font-size:13px}
.app-start-error{min-height:100vh;display:grid;place-items:center;align-content:center;gap:14px;padding:24px;text-align:center;color:var(--text)}
.app-start-error>i{font-size:28px;color:var(--danger)}
.app-start-error>strong{font-size:16px}
.setup-wordmark{display:block;width:170px;max-width:58vw;height:auto;margin:0 auto 8px;object-fit:contain}
.firebase-setup{min-height:100vh;padding:22px 16px;display:flex;flex-direction:column;justify-content:center;background:var(--surface)}
.setup-code{background:#101828;color:#e4e9f0;border-radius:8px;padding:13px;overflow:auto;font:10.5px/1.6 ui-monospace,SFMono-Regular,Menlo,monospace;white-space:pre-wrap;word-break:break-word}
.inline-error{border:1px solid #f2cbd2;background:var(--danger-soft);color:#a52e43;border-radius:8px;padding:10px 12px;font-size:11px;line-height:1.45}
.inline-info{border:1px solid #d7e1ff;background:#f6f8ff;color:#3656b4;border-radius:8px;padding:10px 12px;font-size:11px;line-height:1.5}
.toast{position:fixed;right:16px;top:86px;left:auto;bottom:auto;transform:none;z-index:120;width:min(calc(100vw - 32px),420px);border:1px solid #d6e1ee;border-radius:12px;background:rgba(255,255,255,.98);color:var(--text);box-shadow:0 14px 34px rgba(15,32,58,.12);backdrop-filter:saturate(180%) blur(10px);overflow:hidden}
.toast.rich{width:min(calc(100vw - 32px),520px)}
.toast-inner{display:grid;grid-template-columns:40px minmax(0,1fr) 28px;align-items:flex-start;gap:12px;padding:14px 14px 12px}
.toast-icon{display:grid;place-items:center;width:40px;height:40px;border-radius:10px;background:#eef4ff;color:#0b63f6;font-size:16px}
.toast-copy{display:grid;gap:4px;min-width:0;padding-top:1px}
.toast-copy strong{display:block;color:var(--text);font-size:11.5px;line-height:1.2;font-weight:900}
.toast-copy span{display:block;color:#617287;font-size:10.5px;line-height:1.5;font-weight:700;overflow-wrap:anywhere}
.toast-close{display:grid;place-items:center;width:28px;height:28px;padding:0;border:0;border-radius:8px;background:transparent;color:#8391a3;cursor:pointer}
.toast-close:hover{background:#f3f6fa;color:#405167}
.toast-progress{display:block;height:3px;background:#e8eef7}.toast-progress b{display:block;width:100%;height:100%;transform-origin:left center;background:#0b63f6;animation:toastShrink var(--toast-duration,3600ms) linear forwards}
.toast.success .toast-icon{background:#eefaf3;color:#15975b}.toast.success .toast-progress b{background:#15975b}
.toast.error .toast-icon{background:#fff0f3;color:#b43652}.toast.error .toast-progress b{background:#b43652}
.toast.warn .toast-icon{background:#fff5e8;color:#e37a12}.toast.warn .toast-progress b{background:#e37a12}
.toast.info .toast-icon{background:#eef4ff;color:#0b63f6}.toast.info .toast-progress b{background:#0b63f6}
@keyframes toastShrink{from{transform:scaleX(1)}to{transform:scaleX(0)}}
.spinner{width:17px;height:17px;border:2px solid rgba(255,255,255,.35);border-top-color:currentColor;border-radius:50%;animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.profile-form .form-group{gap:0}

@media (max-width:360px){
  .title-lg{font-size:25px}
  .auth-screen{padding-left:12px;padding-right:12px}
  .auth-box{padding:15px}
  .role-grid{gap:6px}
  .role-card{grid-template-columns:28px minmax(0,1fr);column-gap:7px;padding:8px;min-height:74px}
  .role-icon{width:28px;height:28px}
  .role-card span{font-size:10px}
}

@media(max-width:760px){
  :root{--content-pad:12px}
  .app-view{padding-bottom:calc(76px + var(--safe-bottom))}
  .page{min-width:0}
  .topbar-actions{gap:5px}
  .topbar-wallet-chip{grid-template-columns:18px auto;padding:0 9px;border-radius:9px}
  .topbar-wallet-chip span{display:none}
  .topbar-profile-chip{padding:0 2px}
  .topbar-profile-chip>.fa-chevron-down{display:none}
  .topbar-profile-chip .avatar.sm{width:36px;height:36px;border-radius:10px}
  .bottom-nav{padding:6px 6px calc(6px + var(--safe-bottom));box-shadow:0 -8px 22px rgba(12,35,70,.06)}
  .nav-item{min-height:52px;border-radius:10px;font-size:10px}
  .nav-item i{font-size:15px}
  .nav-item.active{background:#eef4ff}.nav-item.active:before{display:none}
  .toast,.toast.rich{left:14px;right:14px;top:auto;bottom:86px;width:auto}
  .toast-inner{grid-template-columns:36px minmax(0,1fr) 24px;gap:10px;padding:12px}
  .toast-icon{width:36px;height:36px;border-radius:9px;font-size:14px}
}
@media(max-width:430px){
  :root{--content-pad:10px}
  .topbar{min-height:62px;padding-left:12px;padding-right:12px}
  .topbar-title{font-size:15px}
  .topbar-sub{font-size:9px}
  .nav-item{min-height:50px;font-size:9px}
  .nav-item i{font-size:14px}
  .nav-item.create{width:40px;height:40px;min-height:40px}
}

@media (min-width:720px){
  body{padding:22px 0;background:#e9edf2}
  .app-shell{min-height:calc(100vh - 44px);height:calc(100vh - 44px);border:1px solid #d8dee7;border-radius:18px;overflow:hidden;box-shadow:0 18px 48px rgba(32,46,64,.14)}
  .app-view{min-height:100%;height:100%;overflow:auto}
  .bottom-nav{bottom:22px;border-radius:0 0 17px 17px}
  .action-sheet{bottom:22px;border-radius:12px}
  .auth-screen{min-height:100%}
}
.creator-page{padding-bottom:112px}

.math-question{padding:16px;display:flex;flex-direction:column;gap:14px}
.question-hint{margin-top:3px;font-size:10px;color:var(--muted);font-weight:550;text-transform:none;letter-spacing:0}
.optional{color:#98a5b7;font-weight:500;margin-left:4px}
.form-group.compact{gap:0}
math-field.math-input{display:block;width:100%;min-width:0;border:1px solid #d8e1ee;background:#fff;border-radius:8px;padding:10px 12px;font-size:20px;line-height:1.35;--caret-color:var(--primary);--selection-background-color:#dce6ff;--contains-highlight-background-color:#eef3ff;--primary:var(--primary);--smart-fence-color:#4967b6;box-shadow:none}
math-field.math-input:focus-within{border-color:#88a5ff;box-shadow:0 0 0 3px rgba(23,105,255,.08)}
math-field.answer-math{min-height:48px;font-size:18px;padding:8px 10px}
math-field::part(menu-toggle){display:none}
.math-quickbar{display:flex;gap:6px;overflow-x:auto;padding-top:8px;scrollbar-width:none}
.math-quickbar::-webkit-scrollbar{display:none}
.math-chip{flex:0 0 auto;height:31px;padding:0 10px;border:1px solid var(--line);border-radius:6px;background:#fff;color:#43536b;font-size:10.5px;font-weight:750}
.math-chip:active{background:var(--primary-soft);border-color:#b8c9ff;color:var(--primary)}
.diagram-section{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:12px 0}
.mini-action{height:31px;border:1px solid var(--line);border-radius:6px;background:#fff;color:#516177;padding:0 8px;font-size:10px;font-weight:750;display:inline-flex;align-items:center;gap:5px}
.mini-action:active{border-color:#aebfff;color:var(--primary);background:#f7f9ff}
.diagram-empty{margin-top:9px;border:1px dashed #d9e1eb;border-radius:8px;padding:11px;text-align:center;color:#8a97a8;font-size:10px;line-height:1.45;background:#fcfdff}
.diagram-preview{position:relative;margin-top:10px;border:1px solid var(--line);border-radius:8px;background:#fff;overflow:hidden}
.diagram-preview img{display:block;width:100%;height:auto;max-height:320px;object-fit:contain;background:#fff}
.diagram-remove{position:absolute;top:7px;right:7px;width:28px;height:28px;border:1px solid #e2e7ee;border-radius:6px;background:rgba(255,255,255,.95);color:var(--danger)}
.answer-title{display:flex;align-items:flex-end;justify-content:space-between;gap:12px}
.answer-title strong{font-size:12px}
.answer-title span{font-size:10px;color:var(--muted);text-align:right}
.math-answers{display:flex;flex-direction:column;gap:8px}
.math-answer-row{display:grid;grid-template-columns:20px minmax(0,1fr);align-items:center;gap:10px}
.math-answer-row input[type="radio"]{width:17px;height:17px;accent-color:var(--primary)}
.math-render{display:inline-block;border:0;background:transparent;padding:0;pointer-events:none;min-width:0;color:inherit;--primary:var(--primary)}
.math-render::part(menu-toggle),.math-render::part(virtual-keyboard-toggle){display:none}

/* Customer quick-create sheet */
.customer-new-sheet-head{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:0 0 14px;border-bottom:1px solid #dce5ef}.customer-new-sheet-head h3{margin:0;color:#0b2347;font-size:19px;letter-spacing:-.02em}.customer-new-sheet-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;margin-top:14px}.customer-new-item{display:grid;grid-template-columns:44px minmax(0,1fr) 14px;align-items:center;gap:12px;min-width:0;min-height:70px;padding:11px;border:1px solid #cbd8e6;border-radius:7px;background:#fff;color:#0b2347;text-align:left;font:inherit;cursor:pointer}.customer-new-item:hover{border-color:#8eacd1;background:#f8fbff}.customer-new-item>span{display:grid;place-items:center;width:40px;height:40px;border:1px solid #d6e2f1;border-radius:7px;background:#eef4ff;color:#1265ff;font-size:16px}.customer-new-item strong{font-size:12px;line-height:1.2}.customer-new-item>.fa-arrow-right{justify-self:end;color:#1265ff;font-size:11px}.action-sheet.customer-new-sheet{width:min(620px,calc(100vw - 32px));padding:18px}.action-sheet.customer-new-sheet>.sheet-handle{display:none}@media(max-width:600px){.customer-new-sheet-grid{grid-template-columns:1fr}.action-sheet.customer-new-sheet{width:calc(100% - 18px);padding:14px}.customer-new-item{min-height:68px;padding:11px}}

/* Diagram editor sheet */
.action-sheet.diagram-sheet{max-height:min(720px,92vh);overflow:auto;padding-bottom:calc(16px + var(--safe-bottom))}
.diagram-tools{display:flex;gap:6px;overflow-x:auto;padding:8px 0 10px;scrollbar-width:none}
.diagram-tools::-webkit-scrollbar{display:none}
.diagram-tool{flex:0 0 auto;height:34px;border:1px solid var(--line);background:#fff;border-radius:6px;padding:0 10px;font-size:10px;font-weight:750;color:#536177}
.diagram-tool.active{background:var(--primary);border-color:var(--primary);color:#fff}
.diagram-canvas-wrap{border:1px solid var(--line);border-radius:9px;background:#f5f7fa;overflow:hidden;margin-bottom:10px;touch-action:none}
.diagram-canvas{display:block;width:100%;height:auto;aspect-ratio:3/2;background:#fff;touch-action:none}

@media(max-width:390px){
  .math-question{padding:13px}
  .diagram-section>.row{align-items:flex-start;flex-direction:column}
  .diagram-section>.row>.row{width:100%;overflow-x:auto;justify-content:flex-start}
  .math-answer-row{grid-template-columns:20px minmax(0,1fr);gap:8px}
  math-field.answer-math{font-size:17px}
}
.desktop-nav-brand{display:none}
.desktop-nav-toggle{display:none}
.creator-page{display:flex;flex-direction:column;gap:14px}

@media (min-width:900px){
  :root{--content-pad:28px}
  html,body{background:#f3f6fa}
  body{display:block;padding:0}
  .app-shell{width:100%;max-width:none;min-height:100vh;height:auto;border:0;border-radius:0;box-shadow:none;overflow:visible;background:var(--bg)}
  .app-view{min-height:100vh;height:auto;margin-left:232px;padding-bottom:0;overflow:visible;background:var(--bg);transition:margin-left .18s ease}

  .topbar{min-height:72px;padding:12px 32px;background:#fff}
  .topbar-title{font-size:18px}
  .topbar-sub{font-size:11px}
  .page{width:100%;max-width:none;margin:0;padding:30px 32px 56px}

  .bottom-nav{left:0;top:0;bottom:0;transform:none;width:232px;height:100vh;display:flex;flex-direction:column;align-items:stretch;gap:4px;padding:22px 14px;background:#fff;border-top:0;border-right:1px solid #e2e8f0;backdrop-filter:none;transition:width .18s ease,padding .18s ease}
  .desktop-nav-brand{display:flex;height:58px;align-items:center;justify-content:space-between;gap:8px;padding:0 6px 16px 10px;margin-bottom:10px;border-bottom:1px solid #e7ecf2}
  .desktop-nav-brand img{display:block;width:142px;max-height:34px;object-fit:contain;object-position:left center}
  .desktop-nav-toggle{width:34px;height:34px;display:grid;place-items:center;flex:0 0 auto;border:1px solid #d7e0eb;border-radius:6px;background:#fff;color:#002050;cursor:pointer;font-size:13px}
  .desktop-nav-toggle:hover{background:#f3f6fb;border-color:#c6d3e2}
  .app-shell.desktop-sidebar-collapsed .app-view{margin-left:76px}
  .app-shell.desktop-sidebar-collapsed .bottom-nav{width:76px;padding-left:10px;padding-right:10px}
  .app-shell.desktop-sidebar-collapsed .desktop-nav-brand{justify-content:center;padding-left:0;padding-right:0}
  .app-shell.desktop-sidebar-collapsed .desktop-nav-brand img{display:none}
  .app-shell.desktop-sidebar-collapsed .nav-item{justify-content:center;gap:0;padding-left:0;padding-right:0;text-align:center}
  .app-shell.desktop-sidebar-collapsed .nav-item .nav-label{display:none}
  .app-shell.desktop-sidebar-collapsed .nav-item.create{justify-content:center;padding-left:0;padding-right:0}
  .nav-item{width:100%;min-height:46px;display:flex;flex-direction:row;justify-content:flex-start;gap:12px;padding:0 13px;border-radius:7px;font-size:12px;text-align:left}
  .nav-item i{width:20px;font-size:15px;text-align:center}
  .nav-item span{display:block}
  .nav-item.active{background:#eef4ff;color:#125fff;font-weight:800}
  .nav-item.active:before{display:none}
  .nav-item.create{width:100%;height:46px;min-height:46px;margin:6px 0 10px;background:#002050;border-radius:7px;justify-content:flex-start;padding:0 13px;color:#fff}
  .nav-item.create .nav-label{display:block}

  .auth-screen{min-height:100vh;padding:26px 24px}
  .auth-screen>*{max-width:420px}
  .auth-box{padding:20px}

  .card{padding:18px}
  .profile-stats{grid-template-columns:repeat(3,minmax(0,1fr))}

  .creator-page{max-width:none;width:100%;display:grid;grid-template-columns:320px minmax(0,1fr);grid-template-areas:"side main" "save main";gap:18px 22px;align-items:start;padding-bottom:54px}
  .math-question{padding:20px}
  math-field.answer-math{min-height:52px;font-size:19px}
  .math-quickbar{flex-wrap:wrap;overflow:visible}
  .math-chip{height:33px}
  .diagram-preview img{max-height:460px}

  .chat-page{height:100vh;max-width:none;width:100%;margin:0;border-left:1px solid var(--line);border-right:1px solid var(--line);background:#f5f7fa}
  .chat-messages{padding:22px 24px 88px}
  .bubble{max-width:68%;font-size:13px}
  .chat-composer{padding-left:18px;padding-right:18px}

  .action-sheet:not(.diagram-sheet){top:50%;left:50%;right:auto;bottom:auto;width:min(680px,calc(100vw - 40px));max-height:calc(100dvh - 48px);overflow-y:auto;transform:translate(-50%,-50%);border:1px solid #d6e0eb;border-radius:12px;padding:18px;box-shadow:0 20px 54px rgba(11,27,52,.18)}
  .action-sheet.diagram-sheet{top:50%;left:50%;right:auto;bottom:auto;width:min(860px,calc(100vw - 40px));max-height:calc(100dvh - 48px);overflow:auto;transform:translate(-50%,-50%);border:1px solid #d6e0eb;border-radius:12px;padding:18px;box-shadow:0 20px 54px rgba(11,27,52,.18)}
  .diagram-canvas{max-height:560px}
  .toast{top:24px;right:24px;width:min(440px,calc(100vw - 300px))}
  .searchbar .input{height:50px}
  .tabs{max-width:560px}
}

/* AI model registry */
.action-sheet.test-export-sheet{top:50%;bottom:auto;width:min(470px,calc(100% - 24px));transform:translate(-50%,-50%);border:1px solid #d7e0ec;border-radius:12px;padding:16px;box-shadow:0 18px 55px rgba(11,27,52,.2)}
.test-export-summary{display:flex;align-items:center;gap:11px;padding:11px;border:1px solid #dbe4ef;border-radius:8px;background:#f8faff}.test-export-summary>i{width:38px;height:38px;display:grid;place-items:center;flex:0 0 auto;border:1px solid #cbd9ea;border-radius:7px;background:#fff;color:#0c5fe7}.test-export-summary>div{min-width:0}.test-export-summary strong,.test-export-summary span{display:block}.test-export-summary strong{overflow:hidden;color:#0b244d;font-size:11px;text-overflow:ellipsis;white-space:nowrap}.test-export-summary span{margin-top:3px;color:#718097;font-size:10px}
.test-export-key{display:flex;align-items:center;gap:9px;margin-top:10px;padding:10px 11px;border:1px solid #dbe4ef;border-radius:8px;background:#fff;cursor:pointer}.test-export-key input{width:17px;height:17px;margin:0;accent-color:#0c5fe7}.test-export-key strong{font-size:10px;color:#17365f}
.test-export-formats{display:grid;grid-template-columns:1fr 1fr;gap:9px;margin-top:10px}.test-export-formats button{display:grid;grid-template-columns:38px 1fr;grid-template-rows:auto auto;align-items:center;column-gap:10px;min-height:72px;padding:11px;border:1px solid #d5dfeb;border-radius:8px;background:#fff;color:#13345f;text-align:left;cursor:pointer}.test-export-formats button:hover{border-color:#76a5f8;background:#f7faff}.test-export-formats button:disabled{cursor:wait;opacity:.6}.test-export-formats button>i,.test-export-formats button>.spinner{grid-row:1/3;width:38px;height:38px;display:grid;place-items:center;border-radius:7px;background:#eef4ff;color:#0c5fe7;font-size:17px}.test-export-formats button>.spinner{border:2px solid #cad9ee;border-top-color:#0c5fe7;border-radius:50%}.test-export-formats strong{align-self:end;font-size:11px}.test-export-formats span{align-self:start;color:#718097;font-size:10px}.test-export-local{display:flex;align-items:center;justify-content:center;gap:6px;margin-top:10px;color:#61738c;font-size:10px}.test-export-local i{color:#238253}
@media(max-width:420px){.action-sheet.test-export-sheet{top:auto;bottom:0;width:100%;transform:translateX(-50%);border-width:1px 0 0;border-radius:12px 12px 0 0;padding-bottom:calc(16px + var(--safe-bottom))}}

@media (min-width:1280px){
  .app-view{margin-left:236px}
  .bottom-nav{width:236px;padding-left:18px;padding-right:18px}
  .page{max-width:none}
  .creator-page{max-width:none;width:100%;grid-template-columns:340px minmax(0,1fr);gap:24px}
}

@media (min-width:900px){
  .app-shell:has(.bottom-nav.hidden) .app-view{margin-left:0}
}
.avatar{position:relative}
.avatar img{display:block;width:100%;height:100%;object-fit:cover;border-radius:inherit}
.profile-avatar-center{display:flex;justify-content:center}
.avatar-editor{display:grid;grid-template-columns:96px minmax(0,1fr);gap:18px;align-items:center;padding-bottom:4px}
.avatar-edit-preview{width:96px;height:96px;border-radius:16px;font-size:24px;background:var(--surface-3)}
.avatar-editor-actions{display:flex;flex-direction:column;gap:7px;min-width:0}
.avatar-editor-buttons{margin-top:4px;flex-wrap:wrap}
.admin-nav-item{display:none}

@media(max-width:899px){
  .avatar-editor{grid-template-columns:76px minmax(0,1fr);gap:14px}
  .avatar-edit-preview{width:76px;height:76px;border-radius:14px;font-size:20px}
}

@media(min-width:900px){
  .admin-nav-item{display:flex}
}

/* v21.1.4 — Telegram-first unified authentication. */

/* v21.2.0 — icon-only marketplace navigation */
.bottom-nav .nav-label{display:none!important}
.bottom-nav .nav-item{gap:0}
.bottom-nav .nav-item.create{width:44px;height:44px;min-height:44px;border-radius:12px;margin:4px auto 0}
.bottom-nav .nav-item.create i{font-size:18px}
.bottom-nav .nav-icon-wrap{position:relative;display:inline-grid;place-items:center;min-width:32px;min-height:32px}

/* v21.3.4 — fixed desktop icon rail for icon-only marketplace navigation. */
@media (min-width:900px){
  .app-view,.app-shell.desktop-sidebar-collapsed .app-view{margin-left:72px!important}
  .bottom-nav,.app-shell.desktop-sidebar-collapsed .bottom-nav{
    width:72px!important;
    padding:14px 10px!important;
    align-items:center!important;
    gap:8px!important;
  }
  .desktop-nav-brand,.app-shell.desktop-sidebar-collapsed .desktop-nav-brand{
    width:100%;
    height:54px;
    display:grid!important;
    place-items:center;
    padding:0 0 12px!important;
    margin:0 0 6px!important;
    border-bottom:1px solid #e7ecf2;
  }
  .desktop-nav-brand img,.app-shell.desktop-sidebar-collapsed .desktop-nav-brand img{
    display:block!important;
    width:36px!important;
    height:36px!important;
    max-height:none!important;
    object-fit:contain;
    object-position:center;
    border-radius:9px;
  }
  .desktop-nav-toggle{display:none!important}
  .bottom-nav .nav-item,.app-shell.desktop-sidebar-collapsed .nav-item{
    width:44px!important;
    height:44px!important;
    min-height:44px!important;
    flex:0 0 44px;
    display:grid!important;
    place-items:center!important;
    justify-content:center!important;
    padding:0!important;
    margin:0!important;
    border-radius:10px!important;
    gap:0!important;
    background:transparent;
    color:#8391a4;
  }
  .bottom-nav .nav-item i{width:auto!important;font-size:15px!important}
  .bottom-nav .nav-item:hover{background:#f4f7fb;color:#24476f}
  .bottom-nav .nav-item.active{background:#edf4ff!important;color:#176cff!important}
  .bottom-nav .nav-item.create,.app-shell.desktop-sidebar-collapsed .nav-item.create{
    width:44px!important;
    height:44px!important;
    min-height:44px!important;
    margin:2px 0!important;
    background:#002050!important;
    color:#fff!important;
    border-radius:10px!important;
  }
  .bottom-nav .nav-item.create:hover{background:#0a3267!important}
  .bottom-nav .nav-icon-wrap{min-width:32px;min-height:32px}
  .bottom-nav .nav-unread{top:-5px;right:-7px}
}


/* v23.1.1 — dedicated premium Maktab navigation */
.bottom-nav .nav-item.school-premium{color:#0b315f}
.bottom-nav .nav-item.school-premium .nav-icon-wrap{border:1px solid #d7e2ef;border-radius:9px;background:#f7faff;box-shadow:inset 0 -2px 0 rgba(248,96,0,.10)}
.bottom-nav .nav-item.school-premium .nav-icon-wrap:after{content:"";position:absolute;right:1px;top:1px;width:6px;height:6px;border-radius:50%;background:#f86000;border:1.5px solid #fff}
.bottom-nav .nav-item.school-premium:hover{background:#f5f8fc;color:#002050}
.bottom-nav .nav-item.school-premium.active{background:#eef4fb!important;color:#002050!important}
.bottom-nav .nav-item.school-premium.active .nav-icon-wrap{border-color:#b9cde2;background:#fff}
@media(min-width:900px){.bottom-nav .nav-item.school-premium{margin-top:2px!important;margin-bottom:2px!important}.bottom-nav .nav-item.school-premium .nav-icon-wrap{min-width:36px;min-height:36px}}

/* v25.6.1 — hard full-screen navigation isolation.
   Async data callbacks may request a nav refresh, but app/fullscreen routes must never flash the rail. */
.app-shell[data-route="apps"] .bottom-nav,
.app-shell[data-route="video-studio"] .bottom-nav,
.app-shell[data-route="image-studio"] .bottom-nav,
.app-shell[data-route="speaking-one"] .bottom-nav,
.app-shell[data-route="teachers-one"] .bottom-nav,
.app-shell[data-route="teachers-one-subject"] .bottom-nav,
.app-shell[data-route="teachers-one-teacher"] .bottom-nav,
.app-shell[data-route="chat"] .bottom-nav,
.app-shell[data-route="test-player"] .bottom-nav,
.app-shell[data-route="test-preview"] .bottom-nav,
.app-shell[data-route="result"] .bottom-nav,
.app-shell[data-route="lesson"] .bottom-nav{display:none!important;visibility:hidden!important;pointer-events:none!important}
@media(min-width:900px){
  .app-shell[data-route="apps"] .app-view,
  .app-shell[data-route="video-studio"] .app-view,
  .app-shell[data-route="image-studio"] .app-view,
  .app-shell[data-route="speaking-one"] .app-view,
  .app-shell[data-route="teachers-one"] .app-view,
  .app-shell[data-route="teachers-one-subject"] .app-view,
  .app-shell[data-route="teachers-one-teacher"] .app-view,
  .app-shell[data-route="chat"] .app-view,
  .app-shell[data-route="test-player"] .app-view,
  .app-shell[data-route="test-preview"] .app-view,
  .app-shell[data-route="result"] .app-view,
  .app-shell[data-route="lesson"] .app-view{margin-left:0!important}
}