/* Original geometric interface; no third-party artwork or new learning rules. */
:root{--ink:#193c49;--muted:#526b75;--forest:#17626a;--paper:#fffefb;--line:#ccdce0;--radius:20px}
body{background:#eaf2f4;background-image:radial-gradient(ellipse at 85% 0,#f7e6d4 0,transparent 48%),linear-gradient(160deg,#eef4f7,#e2eef0);color:var(--ink);font-size:16px}
.sidebar{background:#193c49;color:#ecf5f4;border:0}.sidebar .wordmark,.sidebar .sidebar-foot a,.sidebar .sidebar-foot button{color:#ecf5f4}.sidebar-label,.sidebar-foot{color:#b9d2d6}.sidebar nav button{color:#d3e2e5;font-size:14px;min-height:46px;border-radius:12px}.sidebar nav button.active{background:#dcecef;color:#163f4a;box-shadow:0 3px 0 #91b3bb}.sidebar nav button:hover{background:#2b5360;color:white}.mark{background:#e7bd78;color:#193c49;box-shadow:3px 3px 0 #0b2630}.topbar{background:#f8fcfd9c;border-bottom:1px solid #cfdee2;font-size:12px}.account{font-size:13px}.avatar{background:#dceced;color:#244e57}
h1{font-size:clamp(34px,4vw,52px);letter-spacing:-1.1px}h2{font-size:23px}.intro{margin-bottom:24px}.eyebrow,.kicker{font-size:12px;letter-spacing:1.5px}.tag,.compact,label{font-size:14px}.help,small,.stat span,.row p,.auth-note{font-size:13px}.card,.stat{box-shadow:0 6px 0 #cbdbdf66,0 16px 32px #173e4910;border-color:#d2e0e3}.hero{background:linear-gradient(125deg,#d4e8e8,#e6eff1 62%,#eee0cf);border:1px solid #bfd6db;box-shadow:0 7px 0 #bdd2d780,0 20px 40px #244d5310}.hero:after{border-color:#8cb3bc;box-shadow:0 0 0 30px #b3d2d333,0 0 0 60px #a2c4d022}.hero p{color:#3e626b}.btn{border-radius:13px;background:#17626a;box-shadow:0 4px 0 #103e46,0 8px 15px #184e5520;transition:transform .16s ease,box-shadow .16s ease;min-height:48px}.btn.secondary{background:#f7fcfd;border-color:#b5cfd6;box-shadow:0 4px 0 #b7cdd2;color:#224e59}.btn.soft{box-shadow:0 4px 0 #b5ced0}.btn:active:not(:disabled){transform:translateY(3px);box-shadow:0 1px 0 #9cb9c0}.btn:hover:not(:disabled){filter:brightness(1.05)}button:disabled{opacity:.48;cursor:not-allowed;box-shadow:none}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid #a8550b;outline-offset:4px}.text{min-height:44px}input,select,textarea{font-size:16px;border-radius:11px}.stats{gap:16px}.stat b{color:#224f5e}.xp-meter{display:block;width:100%;height:8px;margin:12px 0 8px;border:0;border-radius:9px;overflow:hidden;background:#dce8eb;accent-color:#17626a}.xp-meter::-webkit-progress-bar{background:#dce8eb}.xp-meter::-webkit-progress-value{background:#17626a;border-radius:9px}.xp-meter::-moz-progress-bar{background:#17626a}.stat small{display:block}.skill{border-top:3px solid #61939e}.skill-icon{font-family:Georgia,serif}.notice.success{background:#d9eeea;border-color:#85b9ad;box-shadow:0 4px 0 #bbd9d3;animation:reward-in .4s ease-out}.notice.success:before{content:'✦ ';color:#7a510b}dialog{box-shadow:0 22px 100px #102d4970;border:1px solid #c9dade}.feedback button{font-size:14px;min-height:60px;transition:transform .15s;background:#eaf2f4;border-color:#b2cbd1}.feedback button.selected{background:#17626a;box-shadow:0 4px 0 #103e46;transform:translateY(-2px)}.beat-grid button.hit{background:#c9e6e5;color:#16434b}.beat-grid button.playing{outline-color:#17626a;background:#f4d5a3}.cue{background:#e4eff1;border-color:#528f9b}.world-panel{margin-top:28px;padding:26px;border:1px solid #adc7d0;border-radius:26px;background:radial-gradient(ellipse at 5% 20%,#f4dbc099,transparent 45%),linear-gradient(150deg,#e5eef6,#d0e6e8 70%,#edf2ed);box-shadow:0 8px 0 #c0d5da,0 25px 60px #315a6610;overflow:hidden}.world-heading,.world-teaser{display:flex;align-items:center;justify-content:space-between;gap:24px}.world-heading h2{margin-bottom:8px}.world-heading .btn{flex-shrink:0}.world-legend{display:flex;gap:10px 22px;flex-wrap:wrap;padding:12px 0;color:#345966;font-size:13px}.world-board{position:relative;max-width:900px;margin:8px auto 18px}.world-paths{position:absolute;inset:0;width:100%;height:100%;fill:none;stroke:#739ba8;stroke-width:2;stroke-dasharray:5 7;pointer-events:none}.world-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));grid-auto-rows:215px;position:relative}.world-node{--top:#d8e9ee;--left:#95b8c4;--right:#7296aa;color:#28566a;position:relative;display:flex;align-items:center;flex-direction:column;justify-content:center;background:transparent;border:1px solid transparent;border-radius:20px;padding:8px;min-width:0;transition:background .2s,transform .2s}.world-node:hover{background:#ffffff65;transform:translateY(-3px)}.world-node[aria-pressed=true]{background:#ffffff85;border-color:#4d7d8b;box-shadow:0 5px 15px #2e57691a}.world-node strong{font-size:15px;line-height:1.35;max-width:100%;text-align:center}.world-number{font-size:11px;letter-spacing:1px;color:#476874;text-transform:uppercase}.island{width:185px;height:118px;max-width:100%;flex-shrink:0;overflow:visible}.island-top{fill:var(--top)}.island-left{fill:var(--left)}.island-right{fill:var(--right)}.unlocked{--top:#c8eee7;--left:#70b6b5;--right:#4c919c;color:#15545d}.mastered{--top:#fce4a6;--left:#d8b46c;--right:#b28a4c;color:#74520b}.locked{--top:#d9e1e9;--left:#acbbc9;--right:#8d9fad;color:#455a6c}.node-state{font-size:12px;line-height:1.4;margin-top:5px;padding:3px 8px;border-radius:20px;background:#ffffffad}.world-detail{background:#fcfefde8;border:1px solid #b8d0d5;border-radius:16px;padding:22px;display:flex;align-items:center;justify-content:space-between;gap:24px}.world-detail .btn{flex-shrink:0;max-width:240px}.world-detail h3{font-size:22px;margin-bottom:10px}.world-detail p{margin-bottom:9px}.world-teaser{margin-top:28px;padding:26px;border-radius:20px;background:linear-gradient(110deg,#d5e8ec,#f0e4cf);border:1px solid #bfd2d8}.world-teaser h2{margin-bottom:8px}.world-teaser p{margin-bottom:0}.world-teaser .eyebrow{margin-bottom:10px}.workspace-foot{font-size:12px}.world-panel{animation:arrive .5s ease-out}@keyframes arrive{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}@keyframes reward-in{from{transform:translateY(-5px);opacity:.4}to{transform:none;opacity:1}}
@media(max-width:1100px){.world-heading,.world-detail{align-items:flex-start;flex-direction:column}.world-detail .btn{max-width:100%}.world-node strong{font-size:14px}}
@media(max-width:700px){.topbar{font-size:11px}.account{font-size:12px}.sidebar nav button{font-size:14px}.world-panel{padding:18px 12px;margin-top:22px;border-radius:20px}.world-grid{grid-template-columns:repeat(2,minmax(0,1fr));grid-auto-rows:215px;gap:6px}.world-paths{display:none}.world-number{font-size:10px}.island{height:105px;width:160px}.world-node strong{font-size:14px}.world-node{padding:5px}.world-heading{padding:0 5px;gap:12px}.world-legend{gap:8px 12px;font-size:12px}.world-detail{padding:18px}.world-teaser{flex-direction:column;align-items:flex-start;padding:22px}.world-teaser .btn{width:100%}.intro h1{font-size:36px}.hero h1{font-size:34px!important}.world-heading h2{font-size:22px}.stats{gap:12px}.world-heading .btn{min-height:44px}.stat small{font-size:12px}.sidebar-foot{font-size:13px}}
@media(max-width:360px){.world-grid{grid-template-columns:1fr;grid-auto-rows:auto}.world-node{min-height:210px}.island{width:185px;height:118px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}

/* Dream architecture and account-specific, faceless explorers. */
.explorer{width:48px;height:69px;display:block;flex-shrink:0;overflow:visible}.account .avatar{width:40px;height:58px;background:transparent;display:block}.account .explorer{width:40px;height:58px}.explorer-profile,.explorer-welcome{display:flex;align-items:center;gap:18px}.explorer-profile{margin-bottom:18px}.explorer-profile h2,.explorer-profile p{margin-bottom:5px}.explorer-welcome{position:relative;padding:15px 0 20px;max-width:620px}.explorer-welcome p{margin:4px 0 0}.world-panel{background:radial-gradient(ellipse at 90% 5%,#f9e4c9 0,transparent 36%),linear-gradient(145deg,#e8dcef,#dbe6ee 45%,#bee0db);border-color:#d6cce1;box-shadow:0 8px 0 #bdcbd8,0 35px 65px #65597e18}.world-moon{position:absolute;right:-120px;top:0;width:80px;height:80px;border-radius:50%;background:#fff5d6;box-shadow:0 0 60px #fff0cf;pointer-events:none}.world-board{background:radial-gradient(ellipse at 20% 26%,#ffffff8a,transparent 24%),radial-gradient(ellipse at 80% 78%,#fff6,transparent 28%);padding:10px 0}.world-grid{grid-auto-rows:260px;gap:14px 0;padding-bottom:35px}.world-node{justify-content:flex-end;padding:12px 5px;isolation:isolate}.world-node:nth-child(3n+2){transform:translateY(30px)}.world-node:nth-child(3n){transform:translateY(-8px)}.world-node:nth-child(6n+1){--top:#f2d7cd;--left:#d6aeb1;--right:#b88d9f}.world-node:nth-child(6n+2){--top:#e9ddf5;--left:#b6a4cb;--right:#9987b6}.world-node:nth-child(6n+3){--top:#d9eee6;--left:#9cbfba;--right:#75a3a3}.world-node:nth-child(6n+4){--top:#f6e8ba;--left:#d5c092;--right:#b2a084}.world-node:nth-child(6n+5){--top:#e1eafb;--left:#a7bedb;--right:#819dbe}.world-node:nth-child(6n){--top:#f4dbe5;--left:#d2a9c0;--right:#b08eaf}.world-node:hover{background:#ffffff40}.world-node[aria-pressed=true]{background:#fff9;border-color:#927a9f}.island{width:220px;height:175px;filter:drop-shadow(0 13px 9px #68748b15)}.world-node strong{z-index:2}.world-number{position:absolute;top:9px;left:0;right:0;text-align:center}.map-explorer{position:absolute;z-index:3;left:calc(50% - 52px);bottom:92px;pointer-events:none}.map-explorer .explorer{width:30px;height:43px;filter:drop-shadow(0 3px 2px #4c425d25)}.world-node.locked .island{filter:saturate(.45)}.world-paths{opacity:.5}.node-state{background:#fffc;z-index:3}.world-detail{box-shadow:0 6px 0 #b9c8d555}.world-heading h2{font-family:Georgia,serif;font-size:29px;font-weight:400}.world-panel .eyebrow{color:#655377}.world-legend{border-bottom:1px solid #9a91aa30;margin-bottom:12px}.arriving{animation:explorer-arrive .45s ease-out}@keyframes explorer-arrive{from{opacity:0;translate:0 -14px}to{opacity:1;translate:0 0}}@media(max-width:700px){.account .avatar{display:block}.topbar{height:68px}.world-grid{grid-auto-rows:240px;gap:12px 0}.island{height:150px;width:188px}.world-node:nth-child(3n),.world-node:nth-child(3n+2){transform:none}.world-node:nth-child(even){transform:translateY(22px)}.map-explorer{bottom:89px;left:calc(50% - 42px)}.world-moon{display:none}.world-heading h2{font-size:25px}.world-node strong{font-size:13px}.explorer-welcome{gap:12px}}@media(max-width:360px){.world-node:nth-child(even){transform:none}}@media(prefers-reduced-motion:reduce){.arriving{animation:none}}

.explorer-options{border:1px solid var(--line);border-radius:14px;padding:16px;display:grid;gap:12px;background:#f5f1f7}.explorer-options legend{font-weight:650;padding:0 8px}.explorer-options .help{margin:0}.explorer-profile #explorer-preview .explorer{width:66px;height:95px}

.atlas-connection{margin:18px 0;padding:16px;border-left:3px solid #9d8ab4;background:#f1eef7;border-radius:0 10px 10px 0}.atlas-connection h4{margin:0 0 10px}.atlas-connection a{display:inline-block;min-height:32px;text-underline-offset:4px}