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var(--el-color) 12%, var(--bg3));border:1px solid color-mix(in srgb, var(--el-color) 35%, transparent);cursor:pointer;border-radius:10px;flex-direction:column;justify-content:center;align-items:center;gap:1px;min-height:72px;padding:8px 6px;transition:all .18s;display:flex}.el-tile:hover{background:color-mix(in srgb, var(--el-color) 28%, var(--bg3));border-color:var(--el-color);z-index:2;transform:scale(1.08)}.el-num{color:var(--text3);font-size:9px;line-height:1}.el-sym{color:var(--el-color);font-size:20px;font-weight:800;line-height:1.1}.el-name{color:var(--text2);text-align:center;font-size:8px;line-height:1.2}.el-mass{color:var(--text3);font-size:8px}.ptable-btn{color:#fb923c;cursor:pointer;background:linear-gradient(135deg,#f9731633,#f973161a);border:1px solid #f9731666;border-radius:8px;flex-shrink:0;padding:6px 12px;font-size:13px;font-weight:700;transition:all .2s}.ptable-btn:hover{background:#f9731647}.pill-ptable{color:#fb923c;cursor:pointer;background:linear-gradient(135deg,#f9731626,#f973161a);border-color:#f9731666;font-family:inherit;font-weight:700;transition:all .2s}.pill-ptable:hover{background:#f9731640}.phys-card{background:color-mix(in srgb, var(--phys-color) 8%, var(--bg3));border:1px solid color-mix(in srgb, var(--phys-color) 30%, transparent);border-radius:14px;max-width:420px;margin-top:8px;padding:14px;animation:.3s fadeUp}.phys-title{color:var(--phys-color);margin-bottom:10px;font-size:13px;font-weight:700}.phys-svg{background:var(--bg);border-radius:10px;width:100%;height:auto;padding:8px;display:block}.em-spectrum{border-radius:10px;height:44px;margin-bottom:8px;display:flex;overflow:hidden}.em-band{justify-content:center;align-items:flex-end;padding-bottom:4px;display:flex}.em-band span{color:#fff;writing-mode:horizontal-tb;text-shadow:0 1px 3px #0009;font-size:9px;font-weight:700}.em-labels{color:var(--text3);justify-content:space-between;margin-bottom:4px;font-size:10px;display:flex}.em-note{text-align:center;color:var(--text3);font-size:11px}.reaction-block{background:linear-gradient(135deg, #f9731614, var(--bg));border-color:#f973164d!important;font-size:14px!important}.reaction-block .code-lang{color:#fb923c!important}.backdrop{z-index:15;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);background:#0009;display:none;position:fixed;inset:0}.mobile-tabs,.tool-row{display:none}.tool-btn{background:var(--surface);border:1px solid var(--border2);cursor:pointer;border-radius:10px;flex-shrink:0;justify-content:center;align-items:center;width:38px;height:38px;font-size:17px;transition:all .15s;display:flex}.tool-btn:hover{background:var(--surface2);border-color:var(--accent)}.tool-btn:disabled{opacity:.4;cursor:not-allowed}.tool-btn.active{background:var(--accent);border-color:var(--accent);color:#fff}.tool-spacer{flex:1}.tool-streak{color:var(--amber);font-size:13px;font-weight:700}.topbar-left{flex:1;align-items:center;gap:10px;min-width:0;display:flex}.topbar-brand{display:none}@media (width<=768px){.sidebar{z-index:20;width:280px;position:fixed;top:0;bottom:0;left:0;transform:translate(-100%);box-shadow:4px 0 32px #0009}.sidebar.open{transform:translate(0)}.backdrop{display:block}.menu-btn{display:flex}.topbar{gap:8px;padding:0 12px}.topbar-grade{display:none}.ptable-btn{padding:5px 9px;font-size:12px}.quiz-btn{padding:5px 10px;font-size:12px}.messages{gap:14px;padding:14px 12px}.msg-body{max-width:86%}.bubble{font-size:14px}.mol-card,.phys-card{max-width:100%}.iText,.grade-select,.modal input{font-size:16px!important}.welcome{gap:12px}.welcome h2{font-size:20px}.quick-grid{grid-template-columns:1fr 1fr;gap:8px}}@media (width<=480px){.topbar{gap:8px;height:52px;padding:0 12px}.topbar-left{gap:6px}.topbar-brand{color:var(--accent);letter-spacing:-.3px;flex-shrink:0;font-size:15px;font-weight:800;display:block}.topbar-subject{flex-shrink:1;gap:4px;min-width:0;padding:4px 8px;font-size:12px;overflow:hidden}.topbar-subject span:last-child,.topbar-grade,.ptable-btn,.quiz-btn{display:none}.topbar-streak{margin-left:auto;font-size:13px;font-weight:700}.mobile-tabs{background:var(--bg2);border-bottom:1px solid var(--border);scrollbar-width:none;-webkit-overflow-scrolling:touch;flex-shrink:0;gap:0;display:flex;overflow-x:auto}.mobile-tabs::-webkit-scrollbar{display:none}.mobile-tab{cursor:pointer;background:0 0;border:none;border-bottom:2px solid #0000;flex-direction:column;flex-shrink:0;align-items:center;gap:2px;min-width:56px;padding:8px 12px;transition:all .15s;display:flex}.mobile-tab.active{border-bottom-color:var(--s-color,var(--accent));background:color-mix(in srgb, var(--s-color,var(--accent)) 8%, transparent)}.mobile-tab-icon{font-size:18px;line-height:1}.mobile-tab-label{color:var(--text3);font-size:9px;font-weight:600}.mobile-tab.active .mobile-tab-label{color:var(--s-color,var(--accent))}.messages{gap:10px;padding:12px 10px}.msg-row{gap:8px}.msg-avatar{display:none}.msg-body{max-width:95%}.msg-meta{font-size:10px}.bubble{border-radius:16px;padding:10px 13px;font-size:14px;line-height:1.6}.bubble.user{border-top-right-radius:4px}.bubble.assistant{border-top-left-radius:4px}.msg-actions{gap:6px;margin-top:2px}.action-btn{border-radius:8px;padding:4px 9px;font-size:11px}.msg-time{font-size:10px}.welcome{gap:10px;margin:0 auto;padding:6px 0}.welcome-glow{display:none}.welcome-icon{font-size:40px}.welcome h2{letter-spacing:-.3px;font-size:18px}.welcome p{max-width:100%;font-size:13px}.pills{gap:5px}.pill{padding:5px 10px;font-size:11px}.pill-quiz,.pill-ptable{font-size:11px}.quick-grid{grid-template-columns:1fr 1fr;gap:6px}.quick-card{padding:10px;font-size:12px}.inputbar{padding:8px 10px;padding-bottom:max(10px, env(safe-area-inset-bottom));border-top:1px solid var(--border);gap:6px}.tool-row{align-items:center;gap:6px;display:flex}.input-row{align-items:flex-end;gap:6px}.iText{border-radius:20px;min-height:44px;padding:10px 13px;font-size:16px!important}.iBtn{border-radius:14px;width:44px;height:44px;font-size:18px}.iBtn.mic{width:44px;height:44px}.iBtn.send{border-radius:16px;width:48px;height:48px;font-size:18px}.input-row>.iBtn:not(.mic):not(.send),.input-hint{display:none}.listen-bar{padding:4px;font-size:12px}.img-preview img{height:56px}.overlay{background:#000000b3;align-items:flex-end;padding:0}.modal{padding:20px 18px max(20px, env(safe-area-inset-bottom));border-radius:24px 24px 0 0;width:100%;max-width:100%;animation:.3s cubic-bezier(.32,.72,0,1) slideUp}.modal-icon{font-size:36px}.modal h2{font-size:19px}.modal p{font-size:13px}.modal input{padding:11px 14px}.camera-modal{padding:16px 16px max(16px, env(safe-area-inset-bottom));border-radius:20px 20px 0 0;width:100%}.ptable-overlay{align-items:flex-end;padding:0}.ptable-modal{max-height:85vh;padding:14px 12px max(14px, env(safe-area-inset-bottom));border-radius:24px 24px 0 0;animation:.3s cubic-bezier(.32,.72,0,1) slideUp;overflow-y:auto}.ptable-header{font-size:14px}.ptable-hint{display:none}.ptable-legend{gap:4px;margin-bottom:10px}.legend-item{font-size:9px}.legend-dot{width:8px;height:8px}.ptable-grid{grid-template-columns:repeat(auto-fill,minmax(54px,1fr));gap:4px}.el-tile{border-radius:8px;min-height:58px;padding:6px 4px}.el-sym{font-size:17px}.el-name{font-size:7px}.el-mass{display:none}.atom-overlay{align-items:flex-end;padding:0}.atom-modal{padding:16px 16px max(16px, env(safe-area-inset-bottom));border-radius:24px 24px 0 0;max-width:100%;animation:.3s cubic-bezier(.32,.72,0,1) slideUp}.atom-sym{font-size:32px}.atom-name{font-size:14px}.atom-svg{max-height:220px}.mol-card,.phys-card{border-radius:12px;max-width:100%;padding:10px}.mol-svg,.phys-svg{border-radius:8px}.mol-card-header{flex-wrap:wrap;gap:5px}.mol-type{margin-left:0}.code-block{font-size:12px;overflow-x:auto}.bubble .md-h2{font-size:14px}.bubble .md-h3{font-size:13px}}@keyframes slideUp{0%{opacity:0;transform:translateY(100%)}to{opacity:1;transform:translateY(0)}}@supports (padding-bottom:env(safe-area-inset-bottom)){.inputbar{padding-bottom:max(10px, env(safe-area-inset-bottom))}}@media (hover:none){.iBtn:active,.tool-btn:active{opacity:.65;transition:none;transform:scale(.92)}.quick-card:active{background:var(--surface2);transform:scale(.96)}.mobile-tab:active{opacity:.7}.el-tile:active{transform:scale(.88)}.voice-row:active,.subject-btn:active{background:var(--surface2)}}