:root {
  --ink:#19324a; --muted:#6f8294; --line:#dbe6ee; --shadow:0 18px 50px rgba(50,83,110,.12);
  font-family:ui-rounded,"Noto Sans Thai","Tahoma",system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
}
*{box-sizing:border-box} body{margin:0;background:#f7fbfe;color:var(--ink)} button{font:inherit;cursor:pointer} button:disabled{cursor:not-allowed}
.topbar{position:sticky;top:0;z-index:30;display:flex;align-items:center;justify-content:space-between;gap:18px;padding:14px clamp(14px,4vw,64px);background:rgba(255,255,255,.93);backdrop-filter:blur(16px);border-bottom:1px solid rgba(215,226,235,.8)}
.brand{display:flex;align-items:center;gap:12px}.brand-mark{width:48px;height:48px;border-radius:16px;display:grid;place-items:center;font-weight:900;background:linear-gradient(135deg,#34d399,#60a5fa);color:#fff;box-shadow:0 10px 25px rgba(71,168,207,.25)}.brand strong,.brand small{display:block}.brand small{color:var(--muted);margin-top:2px}.top-actions{display:flex;align-items:center;gap:10px}.prototype-pill{padding:8px 12px;border-radius:999px;background:#edf7ff;color:#39769e;font-size:12px;font-weight:900}.icon-btn{border:0;background:#fff;box-shadow:0 5px 20px rgba(36,72,98,.1);width:42px;height:42px;border-radius:13px}
main{width:min(1480px,calc(100% - 32px));margin:0 auto}.hero{margin:28px 0 18px;min-height:210px;padding:clamp(28px,5vw,60px);border-radius:34px;background:radial-gradient(circle at 85% 15%,rgba(255,255,255,.9),transparent 24%),linear-gradient(135deg,#e4fff6 0%,#eef7ff 46%,#fff3d8 100%);display:grid;grid-template-columns:1.45fr .55fr;align-items:center;overflow:hidden;box-shadow:var(--shadow)}.eyebrow,.panel-kicker{margin:0 0 8px;letter-spacing:.12em;font-size:12px;font-weight:900;color:#4386a8}.hero h1{margin:0;font-size:clamp(34px,4vw,62px);line-height:1.05}.hero-copy{max-width:800px;color:#5d7385;font-size:clamp(16px,1.5vw,20px);line-height:1.7}.hero-orbit{display:grid;place-items:center}.mini-robot{width:128px;height:120px;border-radius:38px;background:#fff;border:6px solid #61d7af;position:relative;box-shadow:0 26px 55px rgba(42,124,121,.18);transform:rotate(7deg)}.mini-robot:before{content:"";position:absolute;width:5px;height:30px;background:#425b6b;left:50%;top:-32px}.mini-robot:after{content:"";position:absolute;width:15px;height:15px;border-radius:50%;background:#ffcf5a;left:calc(50% - 5px);top:-44px}.mini-robot span,.mini-robot i{position:absolute;top:34px;width:18px;height:22px;border-radius:50%;background:#304b5b}.mini-robot span{left:27px}.mini-robot i{right:27px}.mini-robot b{position:absolute;width:48px;height:14px;border-radius:0 0 18px 18px;border-bottom:6px solid #304b5b;left:34px;bottom:24px}
.tracks{display:grid;grid-template-columns:repeat(5,1fr);gap:12px;margin-bottom:18px}.track-card{border:1px solid var(--line);background:#fff;border-radius:20px;padding:15px;display:flex;align-items:center;gap:10px;text-align:left;color:var(--ink);transition:.2s;box-shadow:0 7px 22px rgba(52,83,103,.06)}.track-card:hover{transform:translateY(-2px)}.track-card.active{border-color:#6bc8ad;box-shadow:0 0 0 3px rgba(107,200,173,.15),0 12px 30px rgba(52,83,103,.1)}.track-card strong,.track-card small{display:block}.track-card small{color:var(--muted);margin-top:3px}.track-icon{font-size:26px}
.mission-strip{background:#fff;border:1px solid var(--line);border-radius:22px;padding:16px 18px;margin-bottom:16px;box-shadow:0 8px 26px rgba(52,83,103,.07)}.mission-strip-head{display:flex;align-items:center;justify-content:space-between;gap:12px}.mission-strip-head strong{display:block;font-size:18px}.mission-strip-head span:last-child{font-size:12px;font-weight:900;color:#5f8196}.mission-tabs{display:flex;gap:9px;overflow:auto;padding:12px 1px 2px;scrollbar-width:thin}.mission-tab{flex:0 0 auto;border:1px solid #dce7ee;background:#f8fbfd;border-radius:14px;padding:10px 14px;font-weight:900;color:#577184}.mission-tab.active{background:#eafaf4;border-color:#9bd9c4;color:#2f8067}.mission-tab.done:after{content:" ✓"}.mission-tab.locked{opacity:.45}
.workspace-shell{display:grid;grid-template-columns:320px minmax(380px,1fr) minmax(390px,1.06fr);gap:16px;align-items:stretch}.lesson-panel,.program-panel,.stage-panel{background:#fff;border:1px solid var(--line);border-radius:24px;box-shadow:var(--shadow);padding:22px;min-height:690px}.lesson-badge{display:inline-flex;padding:6px 10px;border-radius:999px;background:#ecf8ff;color:#3d87ac;font-weight:900;font-size:11px}.lesson-head h2{font-size:26px;margin:13px 0 8px;line-height:1.25}.lesson-head p{color:var(--muted);line-height:1.6;margin:0}.goal-card{margin:18px 0;padding:15px;border-radius:16px;background:#fff7dc;border:1px solid #f7dda1}.goal-card strong,.goal-card span{display:block}.goal-card span{margin-top:4px;color:#77663e;line-height:1.5}.palette-title-row{display:flex;align-items:flex-start;justify-content:space-between;gap:8px}.block-palette h3{margin:0}.block-palette p{color:var(--muted);font-size:13px;line-height:1.5;margin:6px 0 10px}.unlock-chip{flex:none;padding:5px 9px;border-radius:999px;background:#f1f7fb;color:#66869a;font-size:11px;font-weight:900}.palette-buttons{display:grid;gap:8px}.code-block{width:100%;border:0;border-radius:14px;padding:13px 15px;color:#fff;text-align:left;font-weight:900;box-shadow:0 8px 16px rgba(40,82,108,.12);transition:.15s;user-select:none}.code-block:hover{transform:translateY(-2px)}.code-block .block-icon{display:inline-grid;place-items:center;width:30px;height:30px;margin-right:8px;border-radius:9px;background:rgba(255,255,255,.18)}.move{background:#3c8fed}.left{background:#8f66d9}.right{background:#ef8a3c}.repeat{background:#e05291}.condition{background:#16a085}.tips{margin-top:18px;padding:14px;border-radius:16px;background:#f0fbf7;color:#487466}.tips strong,.tips span{display:block}.tips span{margin-top:4px;font-size:13px}
.panel-title-row{display:flex;align-items:center;justify-content:space-between;gap:14px}.panel-title-row h2{margin:2px 0 0}.text-btn{border:0;background:transparent;color:#5587a3;font-weight:900}.dropzone{min-height:390px;margin-top:18px;border:2px dashed #c7d8e4;border-radius:20px;background:#f8fbfd;padding:14px;outline:none;transition:.2s}.dropzone.dragover{border-color:#4ab49a;background:#f2fffb}.empty-state{min-height:350px;display:grid;place-items:center;align-content:center;text-align:center;color:#8aa0af}.empty-state strong,.empty-state span{display:block}.empty-state span{font-size:13px;margin-top:4px}.empty-icon{font-size:38px;margin-bottom:8px}.program-list{margin:0;padding:0;list-style:none;display:grid;gap:8px}.program-item{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:14px;color:#fff;font-weight:900;box-shadow:0 7px 15px rgba(45,74,93,.08)}.program-index{display:grid;place-items:center;width:26px;height:26px;border-radius:8px;background:rgba(255,255,255,.19);font-size:12px}.program-label{flex:1}.program-detail{display:block;font-size:11px;opacity:.85;margin-top:2px}.remove-btn{border:0;background:rgba(255,255,255,.15);color:#fff;width:30px;height:30px;border-radius:9px}.run-actions{display:grid;grid-template-columns:1fr auto;gap:10px;margin-top:14px}.run-btn,.reset-btn,.ghost-btn,.next-btn{border:0;border-radius:16px;padding:14px 18px;font-weight:900}.run-btn{background:#27b486;color:#fff;box-shadow:0 10px 25px rgba(39,180,134,.25)}.run-btn:disabled{opacity:.5}.reset-btn,.ghost-btn{background:#eef4f7;color:#486678}.code-preview{margin-top:14px;border:1px solid var(--line);border-radius:16px;overflow:hidden}.code-preview summary{cursor:pointer;padding:12px 14px;font-weight:900;background:#f8fbfd}.code-preview pre{margin:0;padding:16px;overflow:auto;background:#17212b;color:#d8f7e8;font-size:13px;line-height:1.6}
.status-badge{padding:7px 10px;border-radius:999px;background:#edf8f4;color:#35866e;font-weight:900;font-size:11px}.stage-wrap{margin-top:18px;padding:16px;border-radius:22px;background:linear-gradient(180deg,#e7f6ff,#f8fff8);border:1px solid #d6e8ef}.stage{width:min(100%,520px);aspect-ratio:1/1;margin:0 auto;position:relative;border-radius:20px;overflow:hidden;background:linear-gradient(#cdeeff 0 42%,#dff6d0 42% 100%);box-shadow:inset 0 0 0 1px rgba(63,103,124,.08)}.grid{position:absolute;inset:0;display:grid;grid-template-columns:repeat(5,1fr);grid-template-rows:repeat(5,1fr)}.grid-cell{border-right:1px dashed rgba(65,112,135,.16);border-bottom:1px dashed rgba(65,112,135,.16)}.obstacles{position:absolute;inset:0}.obstacle{position:absolute;width:16%;height:16%;display:grid;place-items:center;font-size:clamp(22px,3vw,40px);z-index:1}.robot{position:absolute;width:16%;height:16%;transition:left .36s ease,top .36s ease,transform .24s ease;z-index:4;transform-origin:center}.robot-antenna{position:absolute;width:4px;height:16px;background:#486777;left:50%;top:-11px}.robot-antenna:after{content:"";position:absolute;width:10px;height:10px;border-radius:50%;background:#ffcf57;left:-3px;top:-7px}.robot-head{position:absolute;inset:10% 5% 36%;border-radius:30%;background:#f8ffff;border:4px solid #4fc9aa}.robot-head span{position:absolute;top:35%;width:13%;aspect-ratio:1;border-radius:50%;background:#2b5364}.robot-head span:first-child{left:25%}.robot-head span:last-child{right:25%}.robot-body{position:absolute;left:18%;right:18%;bottom:4%;height:35%;border-radius:25%;background:#4fc9aa}.robot-body b{position:absolute;left:50%;top:40%;width:30%;height:18%;border-radius:999px;background:#fff;transform:translate(-50%,-50%)}.star{position:absolute;display:grid;place-items:center;width:16%;height:16%;font-size:clamp(30px,4vw,56px);color:#ffc53e;text-shadow:0 5px 12px rgba(198,140,24,.2);z-index:2}.feedback{margin-top:14px;padding:14px 16px;border-radius:16px;background:#f7fafc;border:1px solid var(--line)}.feedback strong,.feedback span{display:block}.feedback span{color:var(--muted);font-size:13px;margin-top:3px}.feedback.success{background:#ecfbf5;border-color:#a9e3cf;color:#26745d}.feedback.error{background:#fff2ef;border-color:#f6c1b5;color:#934d3d}.progress-card{margin-top:14px}.progress-top{display:flex;justify-content:space-between;font-size:13px}.progress-track{height:10px;border-radius:999px;background:#e9f0f4;margin-top:8px;overflow:hidden}.progress-bar{height:100%;width:0;background:linear-gradient(90deg,#45c8a0,#58a7f5);transition:width .35s}.stage-actions{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:14px}.next-btn{background:#4a91ef;color:#fff}.next-btn:disabled,.ghost-btn:disabled{opacity:.45}
.next-roadmap{margin:24px 0 30px;padding:28px;border-radius:26px;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow)}.next-roadmap h2{margin:0}.roadmap-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:18px}.roadmap-grid article{padding:18px;border-radius:18px;background:#f8fbfd}.roadmap-grid span{font-size:12px;font-weight:900;color:#55a391}.roadmap-grid strong{display:block;margin-top:7px}.roadmap-grid p{color:var(--muted);font-size:13px;line-height:1.5;margin-bottom:0}footer{display:flex;justify-content:space-between;gap:20px;padding:22px clamp(18px,4vw,64px);color:#7b8e9c;font-size:12px}
body.tiny-mode .code-preview{display:none}body.tiny-mode .lesson-head p{font-size:16px}body.tiny-mode .code-block{font-size:18px;padding:15px 16px}body.tiny-mode .code-block .block-icon{width:38px;height:38px;font-size:22px}body.tiny-mode .program-item{font-size:17px;padding:13px}body.tiny-mode .program-detail{display:none}body.tiny-mode .palette-title-row p{display:none}
@media(max-width:1180px){.tracks{grid-template-columns:repeat(3,1fr)}.workspace-shell{grid-template-columns:300px 1fr}.stage-panel{grid-column:1/-1;min-height:auto}.roadmap-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:760px){main{width:min(100% - 20px,1480px)}.topbar{padding:10px 12px}.brand small,.prototype-pill{display:none}.hero{grid-template-columns:1fr;padding:26px}.hero-orbit{display:none}.tracks{grid-template-columns:1fr 1fr}.track-card{padding:12px}.workspace-shell{grid-template-columns:1fr}.lesson-panel,.program-panel,.stage-panel{min-height:auto;padding:16px}.dropzone{min-height:270px}.empty-state{min-height:235px}.roadmap-grid{grid-template-columns:1fr}footer{flex-direction:column}.run-actions{grid-template-columns:1fr}.stage{width:100%}.mission-strip{padding:14px}.stage-actions{grid-template-columns:1fr 1fr}.code-block{min-height:56px;touch-action:manipulation}}
@media(max-width:470px){.tracks{grid-template-columns:1fr}.brand strong{font-size:14px}.brand-mark{width:40px;height:40px;border-radius:12px}.hero h1{font-size:36px}.lesson-head h2{font-size:24px}.stage-actions{grid-template-columns:1fr}.mission-tab{padding:9px 12px}}


/* v0.3 nested block builder */
.insert-target-bar{display:flex;align-items:center;gap:8px;margin-top:16px;padding:10px 12px;border-radius:14px;background:#eef8ff;border:1px solid #d8eaf5;color:#4b758c;font-size:12px}.insert-target-bar strong{font-weight:900;flex:1}.insert-target-bar button{border:0;border-radius:9px;padding:6px 9px;background:#fff;color:#4b758c;font-weight:900;box-shadow:0 2px 8px rgba(52,83,103,.08)}.nested-item{display:block;padding:10px;border-radius:16px}.block-head{display:flex;align-items:center;gap:9px}.block-tools{display:flex;gap:5px;margin-left:auto}.mini-tool{border:0;width:28px;height:28px;border-radius:8px;background:rgba(255,255,255,.15);color:#fff;font-weight:900}.block-settings{display:flex;align-items:center;gap:8px;margin:10px 0 6px;padding:8px 10px;border-radius:11px;background:rgba(255,255,255,.14);font-size:12px}.block-settings select{max-width:100%;border:0;border-radius:8px;padding:7px 8px;background:#fff;color:#29495a;font-weight:800}.nested-list{list-style:none;margin:8px 0 0;padding:0 0 0 14px;display:grid;gap:7px}.nested-list .program-item{box-shadow:0 4px 10px rgba(30,55,75,.12);border:1px solid rgba(255,255,255,.22)}.nested-drop{width:calc(100% - 14px);margin:8px 0 2px 14px;padding:10px 12px;border:2px dashed rgba(255,255,255,.62);border-radius:12px;background:rgba(255,255,255,.11);color:#fff;text-align:left}.nested-drop strong,.nested-drop small{display:block}.nested-drop small{opacity:.8;margin-top:2px}.nested-drop.selected{background:rgba(255,255,255,.27);border-style:solid}.nested-drop.dragover{outline:3px solid rgba(255,255,255,.32)}.branch-wrap{display:grid;gap:8px;margin-top:8px}.branch-box{padding:8px;border-radius:13px;background:rgba(255,255,255,.1)}.branch-title{display:inline-flex;padding:4px 8px;border-radius:999px;background:rgba(255,255,255,.2);font-size:10px;letter-spacing:.06em}.else-box{background:rgba(20,85,75,.16)}
body.tiny-mode .insert-target-bar{display:none}
@media(max-width:760px){.insert-target-bar{position:sticky;top:68px;z-index:8}.block-head{align-items:flex-start}.block-tools{gap:3px}.nested-list{padding-left:8px}.nested-drop{width:calc(100% - 8px);margin-left:8px}.block-settings{flex-wrap:wrap}.program-label{font-size:14px}.mini-tool,.remove-btn{width:32px;height:32px;flex:none}}