/* EDUtools design tokens. No external fonts or assets required. */
:root{--bg:#0b0f18;--surface:#111722;--raised:#171e2b;--text:#edf1fa;--muted:#9ca8bc;--subtle:#8490a5;--line:#252e3f;--accent:#789bff;--accent-solid:#416ff0;--header:rgba(11,15,24,.93);--radius:14px;--space:24px;color-scheme:dark}
:root[data-theme=light]{--bg:#f6f8fc;--surface:#fff;--raised:#edf1f8;--text:#19233b;--muted:#526078;--subtle:#5e6c83;--line:#d9dfeb;--accent:#315bce;--accent-solid:#315edb;--header:rgba(246,248,252,.95);color-scheme:light}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px}body{margin:0;background:var(--bg);color:var(--text);font:15px/1.6 'Segoe UI',Arial,sans-serif;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}button,input,select{font:inherit}button,select{cursor:pointer}button{color:inherit}svg{display:block}button svg,.search-box svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.6}a,button,input,select{ -webkit-tap-highlight-color:transparent}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid var(--accent);outline-offset:5px}button{border:0}button,a{transition:background .2s,border-color .2s,transform .2s,color .2s}.wrap{max-width:1240px;width:calc(100% - 96px);margin:auto}.sr-only{position:absolute;width:1px;height:1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}.skip{position:fixed;left:20px;top:-100px;z-index:10;padding:12px;background:var(--accent-solid);color:#fff}.skip:focus{top:12px}.header{border-bottom:1px solid var(--line);background:var(--header);position:sticky;top:0;z-index:5;backdrop-filter:blur(16px)}.header-inner{height:82px;display:flex;align-items:center;gap:70px}.brand{display:inline-flex;gap:10px;align-items:center;font-size:24px;font-weight:750;letter-spacing:-1px}.brand-light{font-weight:400}.brand-dot{color:var(--accent)}.brand-mark{width:34px;height:34px;display:flex;align-items:center;justify-content:center;border-radius:9px;background:#426ff0;font:700 24px/1 monospace;color:#fff;letter-spacing:-5px;padding-right:5px}.brand-mark span{font-size:18px}.header nav{display:flex;gap:30px;font-size:13px;color:var(--muted)}nav a:hover,.text-link:hover{color:var(--accent)}.header-actions{margin-left:auto;display:flex;align-items:center;gap:14px}.header-actions button{padding:8px;background:transparent;color:var(--muted);border-radius:7px}.header-actions button:hover{background:var(--raised);color:var(--text)}.language select{border:0;background:transparent;color:var(--text);font-size:12px;font-weight:650;padding:8px 2px}.language option{background:var(--surface)}.separator{height:20px;width:1px;background:var(--line)}.hero{padding-top:84px;padding-bottom:76px;display:grid;grid-template-columns:1.12fr 1fr;gap:65px;align-items:center}.eyebrow{font-size:10px;font-weight:700;letter-spacing:1.8px;color:var(--accent);display:flex;gap:9px;align-items:center;margin:0 0 22px}.live-dot{display:inline-block;width:6px;height:6px;border-radius:50%;background:#69d0b0;flex-shrink:0;box-shadow:0 0 9px #69d0b025}h1{font-size:clamp(36px,3.85vw,54px);line-height:1.13;letter-spacing:-2.6px;margin:0 0 25px;font-weight:730}h1 span{color:var(--accent)}.hero-description{font-size:16px;color:var(--muted);max-width:470px;line-height:1.8;margin-bottom:28px}.hero-actions{display:flex;align-items:center;gap:26px}.button{display:inline-flex;align-items:center;justify-content:center;gap:25px;border:1px solid var(--line);border-radius:7px;padding:12px 18px;font-weight:600;font-size:13px;background:var(--raised);color:var(--text)}.primary{background:var(--accent-solid);color:#fff;border-color:var(--accent-solid);box-shadow:0 4px 20px #416ff020}.primary:hover{background:#537ef7;transform:translateY(-2px)}.text-link{font-size:12px;display:flex;gap:14px;align-items:center}.hero-notes{display:flex;gap:21px;margin-top:24px;font-size:10px;color:var(--muted)}.hero-notes b{color:#69bbab;padding-right:3px}.hero-visual{background:#111722;border:1px solid #303b51;border-radius:12px;transform:rotate(-2deg);box-shadow:0 30px 70px #0003;overflow:hidden;color:#b3bed1}.window-bar{height:39px;border-bottom:1px solid #273143;display:flex;align-items:center;padding:0 15px;gap:16px;font:10px monospace}.window-dots{display:flex;gap:5px}.window-dots i{background:#485269;width:6px;height:6px;border-radius:50%}.window-dots i:first-child{background:#bf706e}.window-dots i:nth-child(2){background:#c1a162}.window-dots i:last-child{background:#5d9b86}.window-icon{margin-left:auto}.canvas{padding:18px;background-image:radial-gradient(#263247 1px,transparent 1px);background-size:18px 18px}.canvas-label{font:9px monospace;color:#8696b3;letter-spacing:1px}.canvas-label span:first-child{color:#45516c;margin:0 7px}.flow-preview{width:100%;height:205px}.flow-preview text{font:11px monospace}.code-panel{border:1px solid #2c384f;border-radius:7px;background:#0d1420;max-width:350px;margin:0 0 0 auto;padding:12px 15px}.code-panel>div{display:flex;gap:7px;align-items:center;font:9px monospace}.code-dot{width:6px;height:6px;background:#d1b765;border-radius:2px}.code-tag{margin-left:auto;font:7px 'Segoe UI',sans-serif;color:#7f90ae;letter-spacing:.6px}pre{font:11px/1.9 Consolas,monospace;margin:12px 0 0;color:#c9d4e8}.purple{color:#ba9bed}.blue{color:#84b7ff}.yellow{color:#dec790}.window-footer{display:flex;justify-content:space-between;border-top:1px solid #273143;padding:9px 15px;font-size:9px}.window-footer .live-dot{width:4px;height:4px;margin-right:5px}.principles{display:flex;justify-content:space-between;align-items:center;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:23px 0;gap:20px;color:var(--muted)}.principles>span{font:9px monospace;letter-spacing:1px}.principles>div{display:flex;gap:12px;align-items:center;font-size:12px}.principles>div>span:first-child{font:19px monospace;color:var(--subtle)}.catalog{padding-top:77px;padding-bottom:78px}.section-heading{display:flex;justify-content:space-between;align-items:center;margin-bottom:30px;gap:20px}.section-heading .eyebrow{margin-bottom:10px}h2{font-size:30px;line-height:1.25;letter-spacing:-1px;margin:0 0 12px;font-weight:650}.section-heading p:last-child{font-size:13px;color:var(--muted);margin:0}.catalog-total{display:flex;align-items:center;gap:8px;font-size:10px;color:var(--muted);border:1px solid var(--line);padding:6px 10px;border-radius:20px;white-space:nowrap}.filter-panel{display:flex;justify-content:space-between;gap:20px;padding:14px;background:var(--surface);border:1px solid var(--line);border-radius:10px}.search-box{display:flex;align-items:center;gap:12px;flex:1;max-width:480px;color:var(--subtle)}.search-box input{border:0;background:transparent;color:var(--text);width:100%;min-width:0;font-size:12px;padding:6px}.search-box input::placeholder{color:var(--subtle)}kbd{border:1px solid var(--line);border-radius:4px;padding:0 7px;font-size:12px}.status-filters{display:flex;gap:3px;background:var(--bg);padding:3px;border-radius:6px}.status-filters button{background:transparent;color:var(--muted);font-size:11px;border-radius:4px;padding:6px 13px}.status-filters button[aria-pressed=true]{background:var(--raised);color:var(--text);box-shadow:0 1px 3px #0002}.category-row{display:flex;justify-content:space-between;align-items:center;gap:12px;margin:19px 0 24px}#categories{display:flex;gap:7px;flex-wrap:wrap}#categories button{background:transparent;color:var(--muted);font-size:10px;border:1px solid transparent;border-radius:5px;padding:5px 9px}#categories button[aria-pressed=true]{background:var(--raised);border-color:var(--line);color:var(--text)}#categories button:hover{color:var(--accent)}#result-count{font-size:10px;color:var(--subtle);white-space:nowrap}.tool-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.tool-card{display:flex;flex-direction:column;position:relative;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);padding:22px;min-width:0;overflow:hidden}.tool-card.available{grid-column:span 2;min-height:365px}.tool-card.available:hover{border-color:var(--tool-color);transform:translateY(-4px);box-shadow:0 12px 35px #0002}.card-top{display:flex;align-items:center;justify-content:space-between;gap:10px}.tool-icon{width:37px;height:37px;display:grid;place-items:center;border-radius:9px;color:var(--tool-color);background:color-mix(in srgb,var(--tool-color) 12%,transparent);border:1px solid color-mix(in srgb,var(--tool-color) 20%,transparent)}.tool-icon svg{width:21px;height:21px;fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}.badge{font-size:9px;color:var(--muted);border:1px solid var(--line);padding:3px 7px;border-radius:4px}.available .badge{color:#72c9aa;border-color:#3a6d5b55;background:#408b6610}.card-title{font-size:20px;letter-spacing:-.6px;margin:18px 0 1px}.card-subtitle{font-size:10px;color:var(--tool-color);margin:0 0 13px;letter-spacing:.2px}.card-description{font-size:12px;line-height:1.7;color:var(--muted);margin:0 0 16px}.features{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:20px}.features span{font-size:9px;border:1px solid var(--line);border-radius:4px;padding:3px 7px;color:var(--muted)}.card-bottom{margin-top:auto;padding-top:17px;border-top:1px solid var(--line);display:flex;justify-content:space-between;align-items:center;font-size:11px}.available .card-bottom{color:var(--tool-color);font-weight:600}.mini-preview{height:77px;background:var(--bg);border:1px solid var(--line);border-radius:6px;margin:0 0 16px;display:flex;align-items:center;justify-content:center;gap:13px;color:var(--tool-color);font:10px monospace}.mini-node{border:1px solid currentColor;padding:6px 10px;border-radius:4px}.mini-diamond{transform:rotate(45deg);width:26px;height:26px;border:1px solid currentColor;display:grid;place-items:center}.mini-diamond span{transform:rotate(-45deg)}.mini-table{border:1px solid currentColor;border-radius:4px;padding:5px 12px;font-size:9px}.mini-table span{display:block;opacity:.7;font-size:8px;border-top:1px solid var(--line);margin-top:3px;padding-top:3px}.coming{min-height:230px}.coming .card-title{font-size:16px;margin-top:18px}.coming .card-description{font-size:11px}.coming .card-bottom{font-size:9px;color:var(--subtle)}.coming .tool-icon{width:33px;height:33px}.empty{text-align:center;border:1px dashed var(--line);border-radius:12px;padding:50px 20px;color:var(--muted)}.empty>span{font-size:35px;color:var(--accent)}.empty h3{color:var(--text)}[hidden]{display:none!important}.about{display:grid;grid-template-columns:1fr 1fr;gap:70px;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:49px 0}.about h2{font-size:29px}.about .eyebrow{margin-bottom:17px}.about-copy>p{color:var(--muted);font-size:13px;line-height:1.9;margin:0 0 25px}.about-facts{display:flex;justify-content:space-between;gap:15px}.about-facts>span{display:flex;flex-direction:column;font-size:10px;color:var(--muted);gap:7px}.about-facts b{font:12px monospace;color:var(--accent)}footer{padding:35px 0 20px}.footer-top{display:flex;align-items:center;gap:25px}.footer-top .brand{font-size:19px}.footer-top .brand-mark{width:28px;height:28px;font-size:20px}.footer-top p{font-size:11px;color:var(--muted)}.footer-top nav{display:flex;gap:24px;margin-left:auto;font-size:11px;color:var(--muted)}.footer-bottom{display:flex;justify-content:space-between;margin-top:28px;padding-top:18px;border-top:1px solid var(--line);font-size:9px;color:var(--subtle)}
@media(min-width:1500px){.hero{padding-top:105px;padding-bottom:100px}}@media(max-width:1050px){.wrap{width:calc(100% - 56px)}.hero{gap:35px}.hero-notes{gap:12px;font-size:9px}.tool-grid{grid-template-columns:repeat(2,1fr)}.tool-card.available{grid-column:span 1}.principles{gap:15px}.principles>span{max-width:140px}.header-inner{gap:40px}.card-top{gap:5px}}@media(max-width:760px){.wrap{width:calc(100% - 40px)}.header-inner{height:70px;gap:20px}.header nav{gap:16px;font-size:11px}.brand{font-size:21px}.header-actions{gap:5px}.search-shortcut,.separator{display:none}.hero{grid-template-columns:1fr;padding:48px 0;gap:38px}.hero-copy{max-width:540px}h1{font-size:45px;letter-spacing:-2px}.hero-description{font-size:15px}.hero-visual{max-width:480px;width:94%;justify-self:center;transform:rotate(-1.5deg)}.hero-notes{font-size:10px;gap:18px}.principles{flex-wrap:wrap;padding:20px 0;gap:14px}.principles>span{max-width:none;width:100%;font-size:8px}.principles>div{font-size:10px;gap:6px}.principles>div>span:first-child{font-size:16px}.catalog{padding:48px 0}.section-heading{align-items:flex-start}.catalog-total{font-size:8px;padding:5px 7px;margin-top:2px}h2{font-size:26px}.filter-panel{flex-direction:column;gap:13px;padding:12px}.search-box{max-width:none}.status-filters{align-self:flex-start}.category-row{align-items:flex-start;flex-direction:column}#categories{gap:2px}#categories button{font-size:10px;padding:5px 7px}.tool-card{padding:18px}.card-title{font-size:19px}.badge{font-size:8px}.about{grid-template-columns:1fr;gap:18px;padding:35px 0}.about h2{font-size:27px}.footer-top{flex-wrap:wrap;gap:12px}.footer-top p{width:100%;order:3;margin:0}.footer-bottom{gap:10px}.footer-bottom>span:nth-child(2){display:none}}
@media(max-width:480px){.header nav{display:none}.header-actions{gap:10px}.hero{padding-top:37px}h1{font-size:39px}.eyebrow{font-size:8px;letter-spacing:1.4px}.hero-actions{gap:20px}.button{padding:12px 14px;font-size:12px;gap:18px}.text-link{font-size:11px;gap:8px}.hero-notes{font-size:9px;gap:12px}.section-heading{flex-direction:column;gap:13px}.tool-grid{grid-template-columns:1fr}.tool-card.available{min-height:355px}.coming{min-height:220px}.coming .card-title{font-size:18px}.coming .card-description{font-size:12px}.principles>div{font-size:9px}.about-facts{gap:8px}.about-facts>span{font-size:9px}.flow-preview{height:180px}.code-tag{font-size:6px}.footer-top nav{gap:15px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{animation:none!important;transition:none!important;transform:none!important}}
/* Keep accent text readable on the light surfaces. */
[data-theme=light] .tool-icon,[data-theme=light] .card-subtitle,[data-theme=light] .available .card-bottom{color:color-mix(in srgb,var(--tool-color) 58%,#12213d)}
[data-theme=light] .available .badge{color:#24694e;background:#eaf6f0;border-color:#c5e3d5}
[data-theme=light] .mini-preview{color:color-mix(in srgb,var(--tool-color) 55%,#12213d)}
[data-theme=light] .hero-notes b{color:#24694e}

/* Project support */
.hero-actions{flex-wrap:wrap}
.support{display:grid;grid-template-columns:1.2fr 1fr;gap:60px;align-items:center;padding:60px 0;border-bottom:1px solid var(--line)}
.support-copy>p:not(.eyebrow){color:var(--muted);font-size:14px;line-height:1.85;max-width:610px}
.support-copy .support-note{font-size:12px!important}
.support-card{padding:28px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius)}
.support-heart{display:grid;place-items:center;width:44px;height:44px;border-radius:12px;color:var(--accent);background:var(--raised);font-size:30px;line-height:1}
.support-card h3{font-size:21px;margin:16px 0 8px;letter-spacing:-.5px}
.support-card p{font-size:13px;color:var(--muted);margin:0 0 20px}
.support-card small{display:block;font-size:11px;color:var(--subtle);margin-top:10px}
.support-card .support-thanks{margin:20px 0 0;padding-top:16px;border-top:1px solid var(--line);font-size:12px}
@media(max-width:760px){.support{grid-template-columns:1fr;gap:22px;padding:38px 0}.support-card{padding:24px}.header-inner{gap:20px}.header nav{gap:14px}}
@media(max-width:480px){.footer-top nav{flex-wrap:wrap}.support-card .button{width:100%}}

.support-qr{margin-top:20px;font-size:12px;color:var(--muted)}.support-qr summary{cursor:pointer;color:var(--accent);padding:5px 0}.support-qr summary:focus-visible{outline:3px solid var(--accent);outline-offset:4px}.support-qr img{display:block;background:#fff;border-radius:8px;margin:16px 0;max-width:100%;height:auto}.support-qr p{font-size:12px;margin-bottom:0}

.support-card .support-direct{margin-top:24px;padding-top:20px;border-top:1px solid var(--line)}