@import url('https://fonts.googleapis.com/css2?family=DM+Mono:wght@400;500&family=DM+Sans:wght@400;500;600;700&family=Noto+Sans+SC:wght@400;500;600;700&display=swap');

:root{font-family:'DM Sans','Noto Sans SC',sans-serif;color:#142238;background:#f5f7fa;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;--ink:#142238;--muted:#718094;--line:#dfe5ec;--paper:#fff;--teal:#08a9a3;--teal-dark:#087f7b;--amber:#f5a623;--canvas:#172536;--mono:'DM Mono',ui-monospace,monospace}*{box-sizing:border-box}body{margin:0;min-width:350px}.app-shell{max-width:1520px;margin:0 auto;padding:0 30px}.topbar{height:68px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid #e3e8ee}.brand{display:flex;align-items:center;gap:10px;color:var(--ink);font-weight:700;font-size:23px;text-decoration:none}.brand-mark{width:29px;height:29px;display:grid;place-items:center;border-radius:8px;background:var(--teal);color:#fff;font:600 19px var(--mono);box-shadow:0 3px 8px #08a9a344}.course-mark{color:#8490a0;font-size:14px}.lesson-heading{display:flex;align-items:end;justify-content:space-between;padding:23px 0 16px}.lesson-heading h1{font-size:34px;letter-spacing:-.6px;margin:0 0 4px}.lesson-heading p{margin:0;color:var(--muted);font-size:17px}.lesson-meta{display:flex;align-items:center;gap:9px;color:#718094;font-size:14px;padding-bottom:5px}.lesson-meta span:first-child{color:var(--teal-dark);font-weight:600}.lesson-meta i{width:4px;height:4px;border-radius:50%;background:#a9b3be}.challenge-bar{display:flex;align-items:center;gap:13px;padding:11px 15px;margin-bottom:14px;border:1px solid #dfe7ee;border-radius:9px;background:#fff}.challenge-mark{width:30px;height:30px;display:grid;place-items:center;border-radius:7px;background:#e8f5f4;color:#078b87;font-size:23px}.challenge-bar p{margin:0;color:#485a70;font-size:15px;line-height:1.5}.zone-total{margin-left:auto;white-space:nowrap;color:#78879a;font-size:14px}.zone-total strong{font:500 17px var(--mono);color:#263c52}.workspace{display:grid;grid-template-columns:minmax(0,1fr) 350px;align-items:stretch;gap:13px}.map-card{min-width:0;border-radius:11px;background:#fff;border:1px solid #e0e6ed;padding:16px 17px 12px;box-shadow:0 8px 22px #1b30420b}.map-heading{display:flex;justify-content:space-between;align-items:flex-start;gap:12px}.map-heading h2,.panel-heading h2{font-size:18px;margin:0 0 3px}.map-heading p,.panel-heading p{font-size:13px;color:#8491a0;margin:0;line-height:1.5}.map-legend{display:flex;align-items:center;gap:13px;padding-top:4px;white-space:nowrap;color:#718094;font-size:12px}.map-legend span{display:flex;align-items:center;gap:5px}.legend-dot{width:9px;height:9px;border-radius:50%;background:#e8edf2;border:1px solid #cbd5df}.legend-dot.covered{background:#58c8c1;border-color:#43b3ad}.campus-map{position:relative;margin-top:14px;min-height:282px;padding:17px 21px;border-radius:9px;overflow:hidden;background-color:#eaf0f2;background-image:linear-gradient(90deg,transparent 49.8%,#d9e3e5 50%,transparent 50.5%),linear-gradient(0deg,transparent 49.5%,#d9e3e5 50%,transparent 50.7%);background-size:190px 100%,100% 125px;display:grid;grid-template-columns:repeat(4,minmax(90px,1fr));grid-template-rows:repeat(2,minmax(98px,1fr));align-items:center;justify-items:center;gap:20px 15px}.campus-map::before{content:"";position:absolute;inset:10px;border:1px solid #d6e0e2;border-radius:6px;pointer-events:none}.zone{--zone-color:#11a9a3;position:relative;z-index:1;width:min(100%,164px);min-height:104px;padding:12px 13px;border:1px solid #d5e0e7;border-radius:7px;background:#f9fbfc;color:#405268;box-shadow:0 3px 7px #1d374014;transition:transform .2s ease,background .2s ease,border-color .2s ease,box-shadow .2s ease}.zone::before,.zone::after{content:"";position:absolute;border-radius:4px;background:#e8eef1;z-index:-1}.zone::before{width:29px;height:13px;top:9px;right:8px}.zone::after{width:18px;height:6px;bottom:9px;left:10px}.zone-name{display:flex;align-items:center;gap:8px}.zone-letter{width:28px;height:28px;display:grid;place-items:center;border-radius:50%;background:#e7edf1;color:#607083;font:500 14px var(--mono)}.zone-building{display:block;margin:11px 0 0 2px;font-size:13px;color:#657589}.zone.is-covered{background:color-mix(in srgb,var(--zone-color) 16%,white);border-color:color-mix(in srgb,var(--zone-color) 68%,white);box-shadow:0 5px 12px color-mix(in srgb,var(--zone-color) 18%,transparent);transform:translateY(-2px)}.zone.is-covered .zone-letter{background:var(--zone-color);color:white}.zone.is-current{outline:2px solid var(--amber);outline-offset:2px}.zone.is-uncovered{background:#fff;border-color:#e2a69b;box-shadow:inset 0 0 0 1px #f1d2cd}.map-footer{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:32px;padding:8px 2px 0;color:#78879a;font-size:13px}.coverage-count{color:#273e54;font:500 15px var(--mono);white-space:nowrap}.control-column{display:flex;flex-direction:column;gap:12px}.control-card{background:#fff;border:1px solid #e0e6ed;border-radius:10px;padding:15px 16px}.panel-heading{display:flex;align-items:flex-start;justify-content:space-between;gap:8px}.panel-index{color:#a0acb8;font:13px var(--mono)}.router-list{display:grid;gap:7px;margin-top:13px}.router-option{--router-color:#08a9a3;width:100%;display:grid;grid-template-columns:26px 34px minmax(28px,1fr) 1.4fr;align-items:center;gap:8px;min-height:42px;padding:5px 9px;border:1px solid #e1e7ed;border-radius:7px;background:white;color:var(--ink);text-align:left;cursor:pointer;transition:border-color .16s ease,background .16s ease,transform .16s ease}.router-option:hover{transform:translateY(-1px);border-color:color-mix(in srgb,var(--router-color) 45%,#dfe5ec)}.router-option.is-selected{border-color:var(--router-color);background:color-mix(in srgb,var(--router-color) 8%,white);box-shadow:inset 0 0 0 1px color-mix(in srgb,var(--router-color) 18%,transparent)}.router-option:focus-visible,.button:focus-visible{outline:3px solid #69c7c4;outline-offset:2px}.router-check{width:16px;height:16px;display:grid;place-items:center;border:1px solid #bec9d4;border-radius:4px;color:white;font-size:11px}.router-option.is-selected .router-check{background:var(--router-color);border-color:var(--router-color)}.router-glyph{width:30px;height:30px;display:grid;place-items:center;border-radius:50%;background:var(--router-color);color:white;font-size:17px;box-shadow:0 2px 4px color-mix(in srgb,var(--router-color) 35%,transparent)}.router-id{font:500 14px var(--mono);color:#273c52}.router-zones{color:#768597;font-size:12px;white-space:nowrap}.selection-summary{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-top:10px;padding-top:9px;border-top:1px solid #eef1f4;color:#8692a0;font-size:12px}.selection-summary strong{font-weight:500;color:#334a61;text-align:right}.greedy-card{flex:1;display:flex;flex-direction:column}.greedy-current{display:flex;align-items:center;gap:10px;min-height:56px;margin-top:13px;padding:9px 10px;border-radius:7px;background:#f5f7f9}.current-number{flex:0 0 31px;width:31px;height:31px;display:grid;place-items:center;border-radius:7px;background:#e9eef2;color:#6a798b;font:500 13px var(--mono)}.greedy-current.has-step .current-number{background:#fff0d5;color:#925b0b}.greedy-current strong,.greedy-current small{display:block}.greedy-current strong{font-size:13px;color:#33475d}.greedy-current small{margin-top:3px;color:#83909f;font-size:12px;line-height:1.4}.greedy-controls{display:grid;grid-template-columns:41px minmax(0,1fr) 64px;gap:7px;margin-top:10px}.button{height:37px;border:1px solid #d5dee6;border-radius:6px;background:#fff;color:#495a6e;font:500 13px 'DM Sans','Noto Sans SC',sans-serif;cursor:pointer;transition:transform .15s ease,background .15s ease,border .15s ease}.button:hover{background:#f5f8fa}.button:active{transform:scale(.97)}.button-primary{border-color:#079793;background:var(--teal);color:white}.button-primary:hover{background:#078e8a}.button:disabled{opacity:.45;cursor:not-allowed}.step-meter{height:3px;margin-top:auto;padding-top:13px;background:linear-gradient(#edf1f4,#edf1f4) center/100% 2px no-repeat}.step-meter span{display:block;width:0;height:2px;background:var(--teal);transition:width .2s ease}.results{margin-top:13px;padding:14px 16px 15px;border:1px solid #e0e6ed;border-radius:10px;background:white}.results-heading{display:flex;align-items:end;justify-content:space-between;gap:12px;margin-bottom:11px}.results-heading h2,.trace-heading h2{font-size:17px;margin:0 0 3px}.results-heading p{font-size:13px;color:#8491a0;margin:0}.result-rule{white-space:nowrap;color:#8793a1;font-size:12px}.result-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:9px}.result-panel{min-width:0;border:1px solid #e5eaf0;border-radius:8px;padding:10px 12px;background:#f8fafb}.student-result{background:#f4f9fc}.greedy-result{background:#fff9ec}.best-result{background:#eff9f7}.result-panel-heading{display:flex;align-items:center;justify-content:space-between;gap:8px}.result-panel h3{font-size:14px;margin:0;color:#33495f}.result-tag{padding:3px 7px;border-radius:4px;background:#edf1f4;color:#728093;font-size:11px}.greedy-result .result-tag{background:#fff0d2;color:#8f5b10}.result-tag-good{background:#dbf2ed;color:#087f78}.result-panel p{min-height:34px;margin:7px 0;color:#6b7a8d;font-size:12px;line-height:1.5}.result-metric{display:grid;grid-template-columns:auto 1fr auto 1fr;align-items:baseline;gap:5px 8px;padding-top:7px;border-top:1px solid #e5eaf0}.result-metric strong{font:500 14px var(--mono);color:#294258}.result-panel strong:last-of-type{padding-left:5px}.result-metric span{font-size:11px;color:#8a96a4}.decision-trace{margin-top:12px;border:1px solid #e0e6ed;border-radius:10px;background:#fff;padding:12px 16px 9px}.trace-heading{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:8px}.trace-heading span{color:#8894a2;font-size:12px}.trace-table-wrap{overflow:auto}table{width:100%;border-collapse:collapse;white-space:nowrap;text-align:left}th,td{padding:6px 9px;border-top:1px solid #edf0f3;font-size:12px}th{color:#8995a3;font-weight:500}td{color:#506176}.trace-router{color:#087f7b;font:500 12px var(--mono)}.empty-row td{text-align:center;color:#929eab;padding:11px}.app-footer{display:flex;align-items:center;gap:17px;margin-top:15px;padding:12px 0 18px;border-top:1px solid #e1e7ed;color:#8a95a2;font-size:12px}.app-footer a{margin-left:auto;color:#6a8993;text-decoration:none}.app-footer a:hover{color:#087f7b}

@media(max-width:1000px){.app-shell{padding:0 18px}.workspace{grid-template-columns:minmax(0,1fr) 315px}.campus-map{min-height:260px;gap:15px 10px;padding:14px}.zone{min-height:98px}.router-option{grid-template-columns:20px 30px 25px 1fr;gap:7px;padding:5px 6px}.router-zones{font-size:11px}.results-heading{align-items:flex-start;flex-direction:column}.result-rule{white-space:normal}}
@media(max-width:760px){.app-shell{padding:0 13px}.topbar{height:58px}.brand{font-size:18px}.brand-mark{width:26px;height:26px}.course-mark{font-size:11px}.lesson-heading{padding:20px 0 13px;align-items:flex-start;gap:12px;flex-direction:column}.lesson-heading h1{font-size:28px}.lesson-heading p{font-size:15px}.lesson-meta{padding:0}.challenge-bar{align-items:flex-start;padding:10px;gap:9px}.challenge-bar p{font-size:13px}.challenge-mark{flex:0 0 28px}.zone-total{font-size:11px;padding-top:3px}.workspace{grid-template-columns:1fr}.map-card{padding:13px 12px 10px}.map-heading h2{font-size:16px}.map-heading p{font-size:12px}.map-legend{font-size:11px;gap:8px}.campus-map{min-height:290px;grid-template-columns:repeat(4,minmax(58px,1fr));grid-template-rows:repeat(2,minmax(104px,1fr));gap:11px 7px;padding:14px 8px}.zone{min-height:95px;padding:9px 7px}.zone-letter{width:25px;height:25px}.zone-building{font-size:11px;margin-top:9px}.control-column{display:grid;grid-template-columns:1fr 1fr;align-items:start}.control-card{padding:12px}.router-list{grid-template-columns:1fr}.router-option{grid-template-columns:16px 25px 21px 1fr;gap:5px;min-height:38px}.router-glyph{width:24px;height:24px;font-size:14px}.router-zones{font-size:10px}.panel-heading h2{font-size:15px}.panel-heading p{font-size:11px}.panel-index{font-size:11px}.greedy-controls{grid-template-columns:34px minmax(0,1fr) 53px;gap:4px}.button{height:35px;font-size:11px}.results{padding:12px}.results-heading h2,.trace-heading h2{font-size:15px}.results-heading p{font-size:12px}.result-grid{grid-template-columns:1fr}.result-panel{padding:10px 11px}.result-panel p{min-height:0}.result-metric{grid-template-columns:auto 1fr auto 1fr}.decision-trace{padding:11px 12px 8px}th,td{padding:6px;font-size:11px}.app-footer{gap:10px;font-size:10px}.app-footer a{font-size:11px}}
@media(max-width:440px){.course-mark{max-width:105px;text-align:right;line-height:1.3}.control-column{grid-template-columns:1fr}.campus-map{gap:8px 6px;padding:12px 6px}.zone{width:100%;min-height:88px;padding:8px 6px}.zone-building{font-size:10px}.result-metric{grid-template-columns:auto 1fr auto 1fr}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;transition:none!important}}


/* Map-led classroom view */
.workspace{grid-template-columns:minmax(0,1fr) 394px;gap:15px}.map-card{padding:16px}.campus-map-frame{margin-top:12px;overflow:hidden;border:1px solid #c7d7ca;border-radius:9px;background:#dcebdc;box-shadow:inset 0 1px 8px #536d5712}.campus-map{display:block;width:100%;height:auto;min-height:0;padding:0;overflow:hidden;background:none;grid-template-columns:none;grid-template-rows:none;gap:0}.map-caption{fill:#718674;font:500 12px 'DM Sans','Noto Sans SC',sans-serif;letter-spacing:.08em}.coverage-link{fill:none;stroke-width:2.6;stroke-dasharray:7 6;opacity:.4;transition:opacity .2s ease}.router-pins .router-halo{opacity:0;transition:opacity .2s ease}.router-pin.is-active .router-halo{opacity:.2}.router-core{stroke:#fff;stroke-width:3;filter:drop-shadow(0 2px 3px #1d344a44)}.router-label{font:600 11px var(--mono);text-anchor:middle}.building-shadow{fill:#789179;opacity:.2}.building-body{stroke-width:2;filter:drop-shadow(0 2px 3px #3e584229);transition:fill .24s ease,stroke .24s ease,opacity .24s ease}.zone-pin{stroke:#fff;stroke-width:2}.zone-letter{fill:#fff;font:700 12px var(--mono);text-anchor:middle}.zone-label{fill:#405247;font:500 12px 'DM Sans','Noto Sans SC',sans-serif;text-anchor:middle;paint-order:stroke;stroke:#e7efe6;stroke-width:3px;stroke-linejoin:round}.control-column{gap:11px}.router-card{padding:14px}.router-list{grid-template-columns:repeat(2,minmax(0,1fr));gap:7px;margin-top:12px}.router-option{grid-template-columns:17px 26px 1fr;grid-template-rows:26px 15px;gap:1px 5px;min-width:0;min-height:48px;padding:5px 6px}.router-check{grid-row:1 / 3;grid-column:1}.router-glyph{grid-row:1;grid-column:2;width:25px;height:25px;overflow:visible;fill:var(--router-color)}.router-glyph path{fill:none;stroke:white;stroke-width:1.7;stroke-linecap:round}.router-id{grid-row:1;grid-column:3;font-size:12px}.router-zones{grid-row:2;grid-column:2 / 4;font:10px var(--mono);color:#7a8795;letter-spacing:-.03em}.selection-summary{font-size:11px}.panel-heading p{max-width:235px}.greedy-card{padding:14px}.greedy-current{min-height:51px;margin-top:10px}.step-meter{padding-top:10px}.result-metric{grid-template-columns:auto 1fr auto 1fr}.result-panel p{font-size:12px}
@media(max-width:1050px){.workspace{grid-template-columns:minmax(0,1fr) 350px}.map-card{padding:13px}.router-list{gap:6px}.router-option{grid-template-columns:15px 24px 1fr;gap:1px 4px;padding:4px}.router-glyph{width:23px;height:23px}}
@media(max-width:800px){.workspace{grid-template-columns:1fr}.campus-map-frame{margin-top:10px}.control-column{display:grid;grid-template-columns:minmax(0,1.12fr) minmax(260px,.88fr);align-items:stretch}.router-list{grid-template-columns:repeat(2,minmax(0,1fr))}.router-option{min-height:47px}.greedy-card{min-height:100%}.zone-label{font-size:12px}}
@media(max-width:560px){.workspace{gap:10px}.map-card{padding:11px}.campus-map-frame{border-radius:7px}.map-heading{flex-direction:column}.map-legend{padding-top:0}.map-footer{align-items:flex-start;font-size:11px}.control-column{grid-template-columns:1fr}.router-list{grid-template-columns:repeat(2,minmax(0,1fr))}.router-option{min-height:46px}.greedy-card{min-height:0}.results-heading{gap:5px}.result-rule{display:none}}
/* Cost controls and readable three-part result metrics */
.objective-control{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-top:12px;color:#778597;font-size:12px}
.objective-control select{height:32px;min-width:118px;border:1px solid #dce4eb;border-radius:5px;background:#fff;padding:0 8px;color:#344a60;font:500 12px 'DM Sans','Noto Sans SC',sans-serif}
.router-option{grid-template-columns:17px 26px minmax(22px,1fr) auto}
.router-cost{grid-row:1;grid-column:4;color:#637488;font:500 10px var(--mono);white-space:nowrap}
.router-zones{grid-column:2 / 5}
.result-metric{grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}
.result-metric>div{display:flex;min-width:0;flex-direction:column;gap:3px}
.result-metric strong{padding-left:0!important;font-size:13px}
.result-metric span{font-size:10px;white-space:nowrap}
.trace-table-wrap{max-width:100%}
.optimal-router-list{margin:2px 0 7px!important;color:#087f78!important;font:500 12px var(--mono)!important}
@media(max-width:1050px){.router-option{grid-template-columns:15px 23px minmax(20px,1fr) auto}.router-cost{font-size:9px}.router-zones{grid-column:2 / 5}}
@media(max-width:560px){.router-option{grid-template-columns:16px 24px minmax(20px,1fr) auto}.router-cost{font-size:9px}.result-grid{grid-template-columns:1fr}.result-metric{grid-template-columns:repeat(3,minmax(0,1fr))}}
.zone-letter{width:auto;height:auto;display:block;background:none;border-radius:0}
.router-glyph{display:block;border-radius:0;background:none;box-shadow:none}
@media(max-width:560px){.campus-map-frame{overflow:auto}.campus-map{min-width:720px}}

/* Larger classroom typography and per-router average cost */
.router-option{grid-template-rows:24px auto auto;min-height:63px;align-content:center;gap:2px 5px;padding:6px}
.router-check{grid-row:1 / 4}
.router-glyph{grid-row:1}
.router-id{grid-row:1;font-size:14px}
.router-cost{grid-row:1;font-size:12px}
.router-zones{grid-row:2;grid-column:2 / 5;font-size:12px;line-height:1.3;white-space:normal}
.router-efficiency{grid-row:3;grid-column:2 / 5;color:#65788b;font:500 12px var(--mono);white-space:nowrap}
.objective-control{font-size:14px}
.objective-control select{font-size:14px}
.course-mark,.lesson-meta,.zone-total{font-size:15px}
.lesson-heading h1{font-size:38px}
.lesson-heading p{font-size:18px}
.challenge-bar p{font-size:16px}
.map-heading h2,.panel-heading h2{font-size:20px}
.map-heading p,.panel-heading p{font-size:14px}
.map-legend{font-size:14px}
.map-caption{font-size:14px}
.zone-label{font-size:14px}
.greedy-current strong{font-size:15px}
.greedy-current small{font-size:13px}
.current-number{font-size:14px}
.button{font-size:14px}
.results-heading h2,.trace-heading h2{font-size:19px}
.results-heading p,.result-rule{font-size:14px}
.result-panel h3{font-size:16px}
.result-tag{font-size:12px}
.result-panel p{font-size:14px}
.result-metric strong{font-size:15px}
.result-metric span{font-size:12px}
.trace-heading span,th,td{font-size:14px}
.optimal-router-list{font-size:14px!important}
.app-footer{font-size:13px}
@media(max-width:1050px){.router-option{grid-template-rows:24px auto auto}.router-efficiency{font-size:11px}}
@media(max-width:560px){.router-option{min-height:64px}.router-efficiency{font-size:11px}.course-mark,.lesson-meta,.zone-total{font-size:13px}.lesson-heading h1{font-size:32px}.lesson-heading p{font-size:16px}.challenge-bar p,.map-heading p,.panel-heading p{font-size:14px}.map-legend{font-size:13px}.result-panel p,.results-heading p{font-size:14px}th,td{font-size:13px}}
.router-option{grid-template-rows:24px auto auto auto;min-height:80px}
.router-check{grid-row:1 / 5}
.router-round{grid-row:4;grid-column:2 / 5;color:#344f65;font-size:12px;line-height:1.25;white-space:nowrap}
@media(max-width:1050px){.router-option{grid-template-rows:24px auto auto auto}.router-round{font-size:11px}}
@media(max-width:560px){.router-option{min-height:80px}.router-round{font-size:11px}}