/*! tailwindcss v4.3.4 | MIT License | https://tailwindcss.com */@layer theme{:root,:host{--font-sans:"Vazirmatn", system-ui, sans-serif;--font-mono:ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;--default-font-family:var(--font-sans);--default-mono-font-family:var(--font-mono)}}@layer base{*,:after,:before,::backdrop{box-sizing:border-box;border:0 solid;margin:0;padding:0}::file-selector-button{box-sizing:border-box;border:0 solid;margin:0;padding:0}html,:host{-webkit-text-size-adjust:100%;-moz-tab-size:4;tab-size:4;line-height:1.5;font-family:var(--default-font-family,-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "Noto Sans", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji");font-feature-settings:var(--default-font-feature-settings,normal);font-variation-settings:var(--default-font-variation-settings,normal);-webkit-tap-highlight-color:transparent}hr{height:0;color:inherit;border-top-width:1px}abbr:where([title]){-webkit-text-decoration:underline dotted;text-decoration:underline dotted}h1,h2,h3,h4,h5,h6{font-size:inherit;font-weight:inherit}a{color:inherit;-webkit-text-decoration:inherit;text-decoration:inherit}b,strong{font-weight:bolder}code,kbd,samp,pre{font-family:var(--default-mono-font-family,ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace);font-feature-settings:var(--default-mono-font-feature-settings,normal);font-variation-settings:var(--default-mono-font-variation-settings,normal);font-size:1em}small{font-size:80%}sub,sup{vertical-align:baseline;font-size:75%;line-height:0;position:relative}sub{bottom:-.25em}sup{top:-.5em}table{text-indent:0;border-color:inherit;border-collapse:collapse}:-moz-focusring:where(:not(iframe)){outline:auto}progress{vertical-align:baseline}summary{display:list-item}ol,ul,menu{list-style:none}img,svg,video,canvas,audio,iframe,embed,object{vertical-align:middle;display:block}img,video{max-width:100%;height:auto}button,input,select,optgroup,textarea{font:inherit;font-feature-settings:inherit;font-variation-settings:inherit;letter-spacing:inherit;color:inherit;opacity:1;background-color:#0000;border-radius:0}::file-selector-button{font:inherit;font-feature-settings:inherit;font-variation-settings:inherit;letter-spacing:inherit;color:inherit;opacity:1;background-color:#0000;border-radius:0}:where(select:is([multiple],[size])) optgroup{font-weight:bolder}:where(select:is([multiple],[size])) optgroup option{padding-inline-start:20px}::file-selector-button{margin-inline-end:4px}::placeholder{opacity:1}@supports (not ((-webkit-appearance:-apple-pay-button))) or (contain-intrinsic-size:1px){::placeholder{color:currentColor}@supports (color:color-mix(in lab,red,red)){::placeholder{color:color-mix(in oklab,currentcolor 50%,transparent)}}}textarea{resize:vertical}::-webkit-search-decoration{-webkit-appearance:none}::-webkit-date-and-time-value{min-height:1lh;text-align:inherit}::-webkit-datetime-edit{display:inline-flex}::-webkit-datetime-edit-fields-wrapper{padding:0}::-webkit-datetime-edit{padding-block:0}::-webkit-datetime-edit-year-field{padding-block:0}::-webkit-datetime-edit-month-field{padding-block:0}::-webkit-datetime-edit-day-field{padding-block:0}::-webkit-datetime-edit-hour-field{padding-block:0}::-webkit-datetime-edit-minute-field{padding-block:0}::-webkit-datetime-edit-second-field{padding-block:0}::-webkit-datetime-edit-millisecond-field{padding-block:0}::-webkit-datetime-edit-meridiem-field{padding-block:0}::-webkit-calendar-picker-indicator{line-height:1}:-moz-ui-invalid{box-shadow:none}button,input:where([type=button],[type=reset],[type=submit]){-webkit-appearance:button;-moz-appearance:button;appearance:button}::file-selector-button{-webkit-appearance:button;-moz-appearance:button;appearance:button}::-webkit-inner-spin-button{height:auto}::-webkit-outer-spin-button{height:auto}[hidden]:where(:not([hidden=until-found])){display:none!important}}@layer components,utilities;html{font-family:Vazirmatn,system-ui,sans-serif}:root{font-family:Vazirmatn,sans-serif;color:#152b42;background:#f5f7fa;font-synthesis:none;scroll-behavior:smooth}*{box-sizing:border-box}body{margin:0;min-width:320px}button,textarea{font:inherit}button{cursor:pointer}button:focus-visible,a:focus-visible,textarea:focus-visible{outline:3px solid #6aabde;outline-offset:3px}a{text-decoration:none;color:inherit}.app-shell{min-height:100vh;background:#f5f7fa;overflow:hidden}.page-container{width:100%;max-width:1320px;margin:0 auto;padding-left:24px;padding-right:24px}.topbar{height:76px;background:#fff;border-bottom:1px solid #e4eaf0;position:relative;z-index:15}.topbar-inner{height:100%;max-width:1320px;margin:auto;padding:0 24px;display:flex;justify-content:space-between;align-items:center;gap:20px}.brand{display:flex;align-items:center;gap:11px;min-width:0}.brand-mark{height:43px;width:43px;flex:none;border-radius:12px;background:#123b60;color:#fff;display:grid;place-items:center}.brand strong,.brand small{display:block}.brand strong{font-size:16px;font-weight:800;line-height:1.45}.brand small{color:#7a8b9d;font-size:11px;line-height:1.5}.desktop-nav{display:flex;align-items:center;gap:32px;font-size:13px;font-weight:600;color:#64768a}.desktop-nav a:hover,.mobile-nav a:hover{color:#1775aa}.mobile-menu-btn{display:none;border:0;background:transparent;color:#263c51;height:44px;width:44px;place-items:center}.mobile-nav{display:none}.intro{padding:46px 0 38px}.eyebrow,.section-kicker{color:#2783af;font-size:12px;font-weight:800;letter-spacing:.02em}.eyebrow{display:flex;align-items:center;gap:9px}.pulse-dot,.status-dot,.scene-caption-dot{height:7px;width:7px;border-radius:50%;background:#3b9ecb;display:inline-block;box-shadow:0 0 0 4px #dceef7}.intro h1{font-size:clamp(27px,3vw,39px);line-height:1.55;margin:11px 0 7px;font-weight:900;letter-spacing:0}.intro h1 span{color:#187bad}.intro p{color:#65798e;font-size:15px;margin:0;line-height:1.9}.intro-meta{margin-top:20px;display:flex;flex-wrap:wrap;gap:11px}.intro-meta span{display:inline-flex;align-items:center;gap:7px;font-size:12px;color:#687d8f;background:#eaf0f5;border-radius:6px;padding:7px 11px}.section-heading{display:flex;justify-content:space-between;align-items:end;gap:15px;margin-bottom:19px}.section-heading h2{font-size:24px;font-weight:850;margin:2px 0 0;line-height:1.5}.lab-status{border:1px solid #dce4ec;background:#fff;color:#687c8e;border-radius:50px;padding:7px 12px;font-size:12px;white-space:nowrap;display:flex;align-items:center;gap:9px}.lab-status .status-dot{height:6px;width:6px;background:#8ca0af;box-shadow:none}.status-running .status-dot,.status-done .status-dot{background:#45ad85}.status-paused .status-dot{background:#d3a448}.lab-layout{display:grid;grid-template-columns:minmax(0,1.9fr) minmax(280px,.82fr);gap:18px;align-items:start}.lab-main,.guide-panel,.paper-card,.suggestion-card,.question-card{background:#fff;border:1px solid #e0e8ef;border-radius:13px;box-shadow:0 5px 20px #1f405c09}.lab-main{min-width:0;overflow:hidden}.lab-toolbar{min-height:73px;padding:13px 18px;display:flex;justify-content:space-between;align-items:center;gap:12px}.toolbar-title{display:flex;align-items:center;gap:10px;font-size:14px;font-weight:800}.toolbar-title>span:last-child{display:flex;flex-direction:column;line-height:1.5}.toolbar-title small{font-size:11px;font-weight:400;color:#8292a3}.toolbar-icon{height:35px;width:35px;border-radius:9px;background:#e8f3fa;color:#317fab;display:grid;place-items:center;flex:none}.toolbar-actions{display:flex;align-items:center;gap:7px;flex-wrap:wrap;justify-content:flex-end}.button{border-radius:7px;min-height:40px;border:1px solid transparent;padding:8px 15px;display:inline-flex;align-items:center;justify-content:center;gap:8px;font-size:12px;font-weight:800;transition:background .2s,transform .2s,box-shadow .2s}.button:hover,.icon-button:hover{transform:translateY(-1px)}.button-primary{background:#176d9d;color:#fff;box-shadow:0 4px 10px #176d9d22}.button-primary:hover{background:#10577f;box-shadow:0 5px 13px #176d9d33}.button-quiet{background:#edf4f8;border-color:#dbe7ef;color:#235b7b}.button-quiet:hover{background:#dceef6}.button-outline{background:#fff;border-color:#d8e3ec;color:#3d647e}.button-outline:hover{background:#eaf3f9}.icon-button{display:grid;place-items:center;height:40px;width:40px;flex:none;background:#fff;border:1px solid #dfe6ed;color:#677b8e;border-radius:7px;transition:.2s}.lab-scene{height:368px;position:relative;overflow:hidden;background:linear-gradient(180deg,#dce7ee,#eaf1f5 47%,#d2e0e8 69%,#bbcbd5 70%,#9fb2bd)}.scene-back{position:absolute;top:0;right:0;bottom:30%;left:0;background:linear-gradient(90deg,#d6e3eb,#edf3f6 32%,#dce8ee 67%,#cddde7)}.scene-back:after{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background:repeating-linear-gradient(90deg,transparent 0,transparent 24%,#ffffff42 24.2%,transparent 24.5%);opacity:.5}.back-panel{position:absolute;top:21px;height:145px;width:24%;border:5px solid #b8cad5;background:linear-gradient(125deg,#f2f8fbbb,#d3e6eff5 70%,#f8fcff77);box-shadow:inset 8px 0 15px #fff8,0 3px 10px #7e9aa72a}.panel-one{right:7%}.panel-two{left:7%}.scene-shelf{position:absolute;width:32%;height:7px;left:9%;top:132px;background:#a4b6c1;box-shadow:0 4px 6px #49677830;z-index:1}.shelf-flask{position:absolute;z-index:2;top:91px;width:26px;height:39px;border:2px solid #f8ffff;border-bottom:4px solid #effbff;border-radius:5px 5px 13px 13px;background:linear-gradient(90deg,#ffffff49,#ffffff07 35%,#fff9);box-shadow:0 0 2px #5b8292}.shelf-flask:before{content:"";position:absolute;top:-12px;left:8px;width:7px;height:11px;border:2px solid #f6ffff;border-bottom:0}.flask-one{left:17%}.flask-two{left:24%;height:27px;top:103px}.scene-counter{position:absolute;bottom:0;height:30%;width:100%;background:linear-gradient(180deg,#b7c8d2,#cfdae1 13%,#dce4e8 17%,#c4d1d9 50%,#afc1cc);border-top:6px solid #e6f0f3;box-shadow:0 -10px 15px #536d7b17}.scene-caption{position:absolute;left:19px;bottom:16px;display:flex;align-items:center;gap:8px;direction:ltr;color:#557184;font:10px Arial,sans-serif;letter-spacing:2px;z-index:2}.scene-caption-dot{height:5px;width:5px;box-shadow:none}.rack-zone{position:absolute;width:min(68%,450px);height:230px;left:50%;bottom:36px;transform:translate(-50%);z-index:3}.rack-shadow{position:absolute;bottom:4px;left:7%;width:86%;height:24px;border-radius:50%;background:#46606e44;filter:blur(12px)}.rack-top{position:absolute;top:70px;left:6%;width:88%;height:16px;border-radius:5px;background:linear-gradient(180deg,#f2f5f5,#9caeb9 34%,#8198a7 72%,#c6d2d7);border:1px solid #9aabb5;box-shadow:0 3px 9px #344f5b36;z-index:4}.rack-holes{position:absolute;left:13%;width:74%;top:75px;display:flex;justify-content:space-between;z-index:5}.rack-holes i{height:10px;width:18%;background:#263e4a99;border-radius:50%}.tubes-row{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;justify-content:space-around;align-items:flex-start;padding:0 10%;z-index:6;pointer-events:none}.tube-position{width:26%;height:220px;background:none;border:0;position:relative;padding:0;pointer-events:auto;display:flex;flex-direction:column;align-items:center;color:#19364c}.tube-glass{position:relative;display:block;width:54px;height:157px;margin:2px auto 0;border:3px solid #ecfaffc9;border-top:3px solid #ffffff;border-bottom:5px solid #e9faff;border-radius:4px 4px 26px 26px;background:linear-gradient(90deg,#f8ffff85,#c0e4f244 12%,#f5ffff22 23%,#abc8d327 69%,#ffffff90 87%,#d5f4fd9c);box-shadow:inset 4px 0 5px #fff8,inset -5px 0 7px #789eae44,1px 3px 10px #435e6c44;overflow:hidden;transition:filter .3s}.tube-position:hover .tube-glass,.tube-position:focus-visible .tube-glass{filter:brightness(1.12) drop-shadow(0 0 7px #c4f0ff)}.tube-cap-glint{height:6px;width:62px;border:2px solid #effbff;border-radius:50%;position:absolute;top:0;z-index:3;background:#e5faff66;box-shadow:0 1px 3px #778f9b66}.tube-shine{position:absolute;top:6px;bottom:12px;left:6px;width:5px;border-radius:6px;background:#ffffff9c;z-index:8}.tube-liquid{position:absolute;bottom:0;left:1px;right:1px;height:42%;border-radius:0 0 23px 23px;transition:height 1.5s ease-out,background 2s;box-shadow:inset 0 4px 7px #fff8;animation:gentle-liquid 3s ease-in-out infinite alternate}.tube-liquid:before{content:"";position:absolute;left:0;top:-2px;right:0;height:6px;background:#faffffb5;border-radius:50%;box-shadow:0 2px 3px #8cb4bd75}.fe-liquid{background:linear-gradient(90deg,#b1d5c1ad,#d8e8c4b5 43%,#9dc8b1ad)}.na-liquid{background:linear-gradient(90deg,#d9eaf0aa,#f2f9f4a8 50%,#c4dde7aa)}.reacting-liquid{background:linear-gradient(90deg,#bbd6c4aa,#dce6c4b5 50%,#a8c7b3ab)}.tube-position-3 .tube-liquid{height:46%}.liquid-rise{animation:liquid-fill 1.6s ease-out both}.solid-grains{position:absolute;bottom:5px;left:14px;width:20px;height:14px;border-radius:45%;background:radial-gradient(circle at 30% 30%,#e6d3ac 1px,transparent 2px),radial-gradient(circle at 70% 50%,#b9ad7c 1px,transparent 2px),#c1d0a7b8;box-shadow:3px -2px 0 -1px #a9bf96,-5px -1px 0 -2px #d8dfbd}.tube-position-2 .solid-grains{background:#ebf2ed}.grain-enter{animation:grain-fall .9s ease-in both}.precip-cloud{position:absolute;bottom:12%;left:4%;width:92%;height:38%;background:radial-gradient(ellipse,#91a895a8 0%,#afc5a786 40%,transparent 72%);filter:blur(5px);animation:cloud-grow 2.8s ease-out both;z-index:3}.precip-bed{position:absolute;bottom:0;left:2px;right:2px;border-radius:30% 30% 22px 22px;background:linear-gradient(100deg,#8fa794,#afc0a0 45%,#83998c);box-shadow:0 -4px 10px #8fa79480;transition:height 1.2s ease-out,background 7s;z-index:4}.precip-bed.oxidized{background:linear-gradient(110deg,#9eaa8f,#a2a88c 35%,#9d8067 75%,#8c7769);box-shadow:0 -3px 9px #a5927c70}.particle{position:absolute;width:3px;height:3px;background:#859e85;border-radius:50%;opacity:.8;z-index:5;animation:particle-fall 3.1s linear infinite}.pour-stream{position:absolute;top:-5px;left:47%;width:5px;height:65%;z-index:9;border-radius:0 0 8px 8px;background:linear-gradient(180deg,#ecfbffb3,#b8dce8a6);transform-origin:top;animation:stream-pour 1.15s ease-in-out both}.falling-drop{position:absolute;top:12px;left:48%;height:8px;width:6px;background:#cce8ee;border-radius:50% 50% 60% 60%;z-index:10;animation:drop-fall .85s ease-in both}.tube-number{display:grid;place-items:center;width:23px;height:23px;border-radius:50%;background:#e7f0f4;border:1px solid #c0d2dc;font-size:12px;font-weight:800;margin-top:10px;box-shadow:0 1px 2px #263d4c27}.tube-label{font-size:10px;margin-top:4px;font-weight:700;white-space:nowrap;color:#3d5869}.rack-front{position:absolute;bottom:19px;left:6%;width:88%;height:23px;background:linear-gradient(180deg,#99adb9,#728c9c 45%,#90a5b0);border-radius:3px;box-shadow:0 2px 4px #344d5a66;display:flex;align-items:center;justify-content:space-between;padding:0 13px;color:#d9e7eb;font:9px Arial;letter-spacing:1.5px;z-index:7}.rack-feet{position:absolute;bottom:5px;left:8%;width:84%;display:flex;justify-content:space-between}.rack-feet i{width:16px;height:18px;background:#7691a0;border-radius:2px}.start-overlay,.paused-overlay{position:absolute;top:0;right:0;bottom:0;left:0;background:#e7f0f5d9;-webkit-backdrop-filter:blur(3px);backdrop-filter:blur(3px);z-index:10;display:flex;align-items:center;justify-content:center;flex-direction:column;gap:8px;color:#1d577a;font-size:13px;text-align:center;padding:18px}.start-overlay strong{font-size:18px;color:#163b58}.start-overlay span{color:#5a7487}.paused-overlay{background:#e7edf0bf;font-weight:800;font-size:17px}.scene-paused *{animation-play-state:paused!important}.equipment-bar{padding:16px 18px 18px}.equipment-heading{font-size:13px;font-weight:800;display:flex;align-items:center;justify-content:space-between;gap:8px}.equipment-heading span{font-size:11px;color:#8b9aa8;font-weight:400}.equipment-list{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:8px;margin-top:13px}.equipment-item{min-width:0;min-height:98px;padding:9px 3px 8px;background:#f8fafc;border:1px solid #e5ebf0;border-radius:8px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;position:relative;color:#435c6e;font-size:10px;font-weight:700;line-height:1.4;text-align:center;transition:.2s}.equipment-item:hover{background:#edf6fb;border-color:#9cc9df;transform:translateY(-2px)}.equipment-item.selected{background:#e8f5fb;border-color:#3187b4;color:#166d9c;box-shadow:0 0 0 2px #3187b421}.equipment-item>i{position:absolute;top:6px;right:6px;width:6px;height:6px;border-radius:50%;background:#218ab9}.equipment-visual{width:42px;height:51px;position:relative;display:grid;place-items:center;flex:none}.spoon-visual:before{content:"";position:absolute;top:2px;left:19px;width:4px;height:36px;background:linear-gradient(90deg,#8798a0,#fff,#8699a3);border-radius:3px;transform:rotate(20deg)}.spoon-visual span{position:absolute;bottom:4px;left:19px;width:12px;height:15px;border-radius:50%;transform:rotate(20deg);border:2px solid #a0b0b8;background:linear-gradient(90deg,#bac9cf,#fff)}.dropper-visual:before{content:"";position:absolute;top:1px;left:14px;width:16px;height:13px;border-radius:8px 8px 4px 4px;background:#365a72}.dropper-visual span{position:absolute;top:14px;left:18px;width:8px;height:29px;border-radius:2px 2px 6px 6px;border:2px solid #a9c5cf;background:linear-gradient(180deg,#e5f6fc 40%,#abcfd0 42%)}.dropper-visual:after{content:"";position:absolute;bottom:1px;left:20px;border:3px solid transparent;border-top-color:#88a9b8}.water-visual:before,.bottle-visual:before{content:"";position:absolute;top:4px;left:9px;width:25px;height:42px;border-radius:4px 4px 7px 7px;border:2px solid #b5cbd5;background:linear-gradient(90deg,#f6ffff,#d5edf4 60%,#fff);box-shadow:inset 3px 0 3px #fff}.water-visual:after,.bottle-visual:after{content:"";position:absolute;top:0;left:15px;width:13px;height:6px;border-radius:2px;background:#678ba2}.water-visual span,.bottle-visual span{font:700 10px Arial;z-index:2;color:#4682a5;background:#f7fcffab;padding:2px 1px;border-radius:2px}.bottle-visual:before{background:linear-gradient(90deg,#f8f7ec,#d8d1b0,#f8f7ec)}.na-bottle:before{background:linear-gradient(90deg,#f4f8f8,#dce9e9,#f5faf8)}.bottle-visual span{font-size:9px;color:#536d7b}.waste-visual:before{content:"";position:absolute;top:9px;width:27px;height:36px;background:linear-gradient(90deg,#6d8291,#405a6b 50%,#78909a);border-radius:2px 2px 7px 7px}.waste-visual:after{content:"";position:absolute;top:5px;width:32px;height:6px;background:#415b6b;border-radius:3px}.waste-visual span{z-index:1;color:#e1e9eb;font-size:18px}.equipment-load{font-size:11px;color:#6e8595;padding-top:10px;min-height:26px}.guide-panel{padding:21px}.guide-header{display:flex;align-items:center;gap:11px}.guide-header-icon{height:42px;width:42px;background:#e7f2f9;border-radius:10px;color:#2380ad;display:grid;place-items:center}.guide-header h3{font-size:18px;margin:1px 0 0}.progress-track{height:6px;background:#e9eff3;border-radius:10px;margin:23px 0 7px;overflow:hidden}.progress-track>div{height:100%;border-radius:10px;background:#2582ae;transition:width .7s}.progress-caption{display:flex;justify-content:space-between;color:#8495a4;font-size:11px}.progress-caption strong{color:#267fa9}.stage-list{border-top:1px solid #edf0f3;margin-top:20px;padding-top:7px}.stage-item{display:flex;align-items:center;gap:12px;padding:11px 0;position:relative}.stage-item:not(:last-child):after{content:"";position:absolute;right:16px;top:49px;width:1px;height:20px;background:#e1e9ee}.stage-index{width:32px;height:32px;border:1px solid #e1e8ee;color:#94a3ae;border-radius:50%;display:grid;place-items:center;font-size:13px;flex:none;background:#f6f8fa}.stage-current .stage-index{background:#e5f2f9;color:#1f7ea8;border-color:#b9dcec}.stage-done .stage-index{background:#dff2e9;color:#298365;border-color:#bde2d0}.stage-item strong,.stage-item small{display:block;line-height:1.5}.stage-item strong{font-size:12px;color:#6a7e8f}.stage-current strong,.stage-done strong{color:#233e55}.stage-item small{color:#97a6b1;font-size:10px;margin-top:2px}.stage-current small{color:#227eaa}.stage-done small{color:#32936e}.current-step{padding:15px;background:#eaf4fa;border:1px solid #d7eaf4;border-radius:9px;margin-top:13px}.current-step-tag{display:flex;gap:7px;align-items:center;color:#2880a6;font-size:11px;font-weight:700}.current-step-tag b{margin-right:auto;font-size:10px;font-weight:500}.tiny-flash{height:6px;width:6px;border-radius:50%;background:#4198bf}.current-step p{font-size:13px;line-height:1.9;font-weight:700;color:#1e4762;margin:10px 0 0}.drop-count{font-size:11px;color:#327c9b;margin-top:8px}.guide-toggle{margin-top:16px;width:100%;background:#fff;border:1px solid #dbe7ee;border-radius:7px;min-height:43px;display:flex;align-items:center;gap:8px;color:#336887;padding:8px 11px;font-size:12px;font-weight:700}.guide-toggle:hover{background:#f0f8fb}.guide-toggle svg:last-child{margin-right:auto;transition:transform .25s}.rotated{transform:rotate(180deg)}.guide-expanded{background:#f7fafc;border:1px solid #e5edf1;padding:8px 12px;border-radius:7px;margin-top:8px;color:#587184;font-size:11px;line-height:2}.guide-expanded p{margin:5px 0}.guide-note{display:flex;gap:8px;margin-top:19px;padding-top:16px;border-top:1px solid #edf0f3;color:#8292a1;font-size:10px;line-height:1.9}.guide-note svg{flex:none;margin-top:3px;color:#8da4b2}.content-section{padding-top:53px}.equation-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:13px}.equation-card{background:#fff;border:1px solid #e1e9ef;border-radius:10px;padding:19px;min-width:0;box-shadow:0 3px 12px #2b55700a}.equation-index{color:#7990a0;font-size:11px;font-weight:800}.equation-card p{margin:22px 0 6px;font-family:Arial,sans-serif;font-size:clamp(13px,1.4vw,18px);font-weight:700;color:#273f50;white-space:normal;overflow-wrap:anywhere;line-height:1.8;text-align:left}.equation-card p span{color:#2888b7;padding:0 3px}.equation-highlight{background:#eaf4f8;border-color:#cce5ee}.equation-highlight .equation-index,.equation-highlight p{color:#236c8e}.science-explanation{display:flex;gap:13px;margin-top:13px;background:#f0f5f8;border:1px solid #e3ebf0;border-radius:9px;padding:18px 20px;color:#537082;font-size:12px;line-height:2}.science-explanation svg{flex:none;color:#3784a7;margin-top:3px}.science-explanation strong{color:#294c63;font-size:13px}.science-explanation p{margin:4px 0 0}.ready-badge,.pending-badge,.question-count{font-size:11px;padding:7px 11px;border-radius:6px;display:inline-flex;align-items:center;gap:6px;background:#e6f4ec;color:#328063;white-space:nowrap}.pending-badge,.question-count{background:#e9eff3;color:#698397}.observation-layout{display:grid;grid-template-columns:1.1fr .9fr;gap:14px}.paper-card,.suggestion-card{padding:21px}.card-title{display:flex;align-items:center;gap:10px;margin-bottom:19px}.card-icon{width:34px;height:34px;background:#eaf4f9;border-radius:8px;color:#2981ac;display:grid;place-items:center}.card-title h3{font-size:15px;margin:0}.paper-card label{font-size:12px;color:#516a7e;font-weight:700;display:block;margin-bottom:9px}.paper-card textarea,.question-card textarea{border:1px solid #dce6ed;border-radius:7px;width:100%;padding:12px 13px;resize:vertical;background:#fbfcfd;color:#233f54;outline:none;font-size:13px;line-height:1.9;display:block;transition:border-color .2s,box-shadow .2s}.paper-card textarea:focus,.question-card textarea:focus{border-color:#69acd0;box-shadow:0 0 0 3px #69acd024}.paper-card textarea::placeholder,.question-card textarea::placeholder{color:#a0aeba}.paper-card>small{display:block;color:#9cabb5;font-size:10px;margin-top:9px}.suggestion-card ul{margin:0;padding:0;list-style:none;display:grid;gap:12px}.suggestion-card li{display:flex;align-items:flex-start;gap:10px;color:#5f7586;font-size:12px;line-height:1.8}.suggestion-card li span{height:6px;width:6px;background:#75aac0;border-radius:50%;margin-top:9px;flex:none}.question-section{padding-bottom:70px}.questions-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.question-card{padding:20px;min-width:0}.question-head{display:flex;align-items:flex-start;gap:10px;min-height:55px}.question-number{width:27px;height:27px;border-radius:7px;background:#e8f2f8;color:#267da6;flex:none;display:grid;place-items:center;font-size:12px;font-weight:800}.question-head h3{margin:0;font-size:13px;line-height:1.9;font-weight:750;color:#2f4b5e}.question-card textarea{min-height:75px}.answer-reveal{display:flex;gap:9px;padding:12px;margin-top:12px;background:#edf8f1;border:1px solid #d4eade;border-radius:7px;color:#397b5b;font-size:11px;line-height:1.8}.answer-reveal svg{flex:none;margin-top:2px}.answer-reveal p{margin:3px 0 0;color:#436655}.answer-error{color:#a33c3c;background:#fff0f0;border:1px solid #f4d5d5;padding:10px 14px;border-radius:7px;font-size:12px;display:flex;gap:8px;align-items:center}.question-footer{margin-top:20px;display:flex;align-items:center;gap:14px;flex-wrap:wrap}.question-footer>span{font-size:11px;color:#8b9aa8}.footer{border-top:1px solid #e1e8ee;background:#edf2f5}.footer-inner{min-height:75px;display:flex;align-items:center;justify-content:space-between;gap:12px;color:#7690a1}.footer-inner>span{display:flex;align-items:center;gap:8px;font-size:12px;font-weight:800;color:#4b6e83}.footer-inner small{font-size:11px}.toast{position:fixed;z-index:30;left:24px;bottom:24px;width:min(420px,calc(100% - 48px));display:flex;align-items:flex-start;gap:10px;background:#153a55;color:#fff;box-shadow:0 12px 35px #18384a55;padding:14px 15px;border-radius:9px;font-size:12px;line-height:1.9;animation:toast-in .25s ease-out}.toast>svg{flex:none;margin-top:2px;color:#9ed7ef}.toast span{flex:1}.toast button{border:0;background:transparent;color:#cbdce5;display:grid;place-items:center;padding:2px}.toast button:hover{color:#fff}@keyframes toast-in{0%{transform:translateY(15px);opacity:0}to{transform:translateY(0);opacity:1}}@keyframes liquid-fill{0%{height:2%;filter:blur(3px)}to{height:42%;filter:blur(0)}}@keyframes gentle-liquid{0%{transform:skewY(-1deg)}to{transform:skewY(1deg)}}@keyframes grain-fall{0%{transform:translateY(-85px);opacity:0}to{transform:translateY(0);opacity:1}}@keyframes stream-pour{0%{transform:scaleY(0);opacity:0}25%{transform:scaleY(1);opacity:.8}75%{transform:scaleY(1);opacity:.7}to{transform:scaleY(.2);opacity:0}}@keyframes drop-fall{0%{transform:translateY(-8px) scale(.5);opacity:0}30%{opacity:1}to{transform:translateY(75px) scale(1.1);opacity:0}}@keyframes cloud-grow{0%{transform:scale(.2) translateY(-20px);opacity:0}to{transform:scale(1);opacity:1}}@keyframes particle-fall{0%{transform:translateY(-13px) translate(2px);opacity:0}20%{opacity:.8}90%{opacity:.7}to{transform:translateY(25px) translate(-3px);opacity:0}}@media(max-width:1050px){.lab-layout{grid-template-columns:minmax(0,1.5fr) minmax(265px,.9fr)}.equipment-list{grid-template-columns:repeat(3,minmax(0,1fr))}.equipment-item{min-height:82px}.lab-toolbar{align-items:flex-start}.toolbar-title small{max-width:170px}.equation-grid{grid-template-columns:1fr 1fr}.equation-highlight{grid-column:span 2}}@media(max-width:760px){.page-container,.topbar-inner{padding-left:16px;padding-right:16px}.topbar{height:65px}.brand-mark{width:39px;height:39px}.desktop-nav{display:none}.mobile-menu-btn{display:grid}.mobile-nav{display:flex;flex-direction:column;background:#fff;padding:10px 18px 16px;box-shadow:0 12px 20px #2148631c;border-bottom:1px solid #e4eaf0}.mobile-nav a{padding:10px 4px;font-size:13px;color:#4a6478}.intro{padding:31px 0 32px}.intro h1{font-size:27px}.intro p{font-size:13px}.section-heading h2{font-size:21px}.lab-layout{grid-template-columns:1fr}.lab-scene{height:348px}.guide-panel{order:2}.equipment-list{grid-template-columns:repeat(6,minmax(0,1fr))}.equipment-item{min-height:92px}.equation-grid{grid-template-columns:1fr}.equation-highlight{grid-column:auto}.equation-card p{font-size:16px}.observation-layout,.questions-list{grid-template-columns:1fr}.question-head{min-height:0;margin-bottom:13px}.content-section{padding-top:43px}}@media(max-width:540px){.lab-toolbar{flex-direction:column;align-items:stretch;padding:13px}.toolbar-actions{justify-content:flex-start}.toolbar-title small{max-width:none}.lab-scene{height:310px}.rack-zone{width:95%;height:215px;bottom:24px}.tube-glass{width:45px;height:143px}.tube-cap-glint{width:53px}.rack-top{top:63px}.rack-holes{top:68px}.rack-front{bottom:12px}.rack-feet{bottom:0}.tube-label{font-size:9px}.tube-number{margin-top:7px}.equipment-bar{padding:14px 12px}.equipment-heading{align-items:flex-start;flex-direction:column;gap:2px}.equipment-list{grid-template-columns:repeat(3,minmax(0,1fr))}.equipment-item{min-height:88px}.lab-status{font-size:10px}.section-heading{align-items:center}.section-heading .button-outline{font-size:10px;line-height:1.5;padding:7px;max-width:160px}.intro-meta{gap:7px}.intro-meta span{font-size:10px}.footer-inner{flex-direction:column;align-items:flex-start;justify-content:center;padding-top:16px;padding-bottom:16px}.question-footer .button{width:100%}.toast{left:12px;bottom:calc(12px + env(safe-area-inset-bottom));width:calc(100% - 24px)}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation-duration:.01ms!important;transition-duration:.01ms!important;scroll-behavior:auto!important}}