:root{color-scheme:dark;--accent:#6cf2c2;--bg:#17243a;--ink:#f6f8ff;--muted:#a8b3c8}*{box-sizing:border-box}body{margin:0;min-height:100vh;font-family:Inter,ui-rounded,system-ui,sans-serif;color:var(--ink);background:radial-gradient(circle at 20% 0%,color-mix(in srgb,var(--accent) 18%,transparent),transparent 34%),linear-gradient(145deg,#080c16,var(--bg));display:grid;place-items:center;padding:24px;padding-top:max(24px,env(safe-area-inset-top));padding-bottom:max(24px,env(safe-area-inset-bottom))}.shell{width:min(560px,100%);background:#0a1020cc;border:1px solid #ffffff1c;border-radius:28px;padding:clamp(18px,4vw,38px);box-shadow:0 30px 100px #0008;backdrop-filter:blur(18px)}header{display:flex;align-items:start;justify-content:space-between;gap:20px;flex-wrap:wrap}.eyebrow{text-transform:uppercase;letter-spacing:.15em;color:var(--accent);font-weight:800;font-size:.72rem;margin:0 0 8px}h1{font-size:clamp(1.6rem,6vw,2.8rem);line-height:.95;letter-spacing:-.03em;margin:0;max-width:760px}.pitch{color:var(--muted);font-size:1.05rem;max-width:620px}.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:25px 0 14px}.stats div{background:#ffffff0a;border:1px solid #ffffff12;border-radius:16px;padding:12px 16px;text-align:center}.stats span{display:block;color:var(--muted);font-size:.72rem;text-transform:uppercase;letter-spacing:.1em}.stats strong{font-size:1.5rem}.game{position:relative;background:linear-gradient(160deg,#ffffff08,#0002);border:1px solid #ffffff14;border-radius:22px;padding:14px;display:flex;justify-content:center}
.grid{display:grid;gap:4px;width:min(420px,84vw,62vh);aspect-ratio:1/1}
.pipe-cell{position:relative;border-radius:8px;background:linear-gradient(155deg,#121c30,#0a1120);cursor:pointer;overflow:hidden;border:1px solid #ffffff12;touch-action:manipulation;-webkit-tap-highlight-color:transparent;transition:transform .1s ease,border-color .2s ease}
.pipe-cell:active:not(:disabled){transform:scale(.93)}
.pipe-cell.source,.pipe-cell.target{cursor:default}
.pipe-icon{position:absolute;inset:0;transition:transform .15s}
.arm{position:absolute;background:linear-gradient(155deg,#4b5f7d,#33445c);border-radius:3px}
.arm.n{left:41%;top:0;width:18%;height:55%}
.arm.e{top:41%;right:0;height:18%;width:55%}
.arm.s{left:41%;bottom:0;width:18%;height:55%}
.arm.w{top:41%;left:0;height:18%;width:55%}
.hub{position:absolute;left:32%;top:32%;width:36%;height:36%;border-radius:50%;background:radial-gradient(circle at 35% 30%,#5a7093,#33445c 70%)}
.pipe-cell.connected .arm{background:linear-gradient(155deg,color-mix(in srgb,var(--accent) 85%,white),var(--accent));box-shadow:0 0 8px color-mix(in srgb,var(--accent) 60%,transparent)}
.pipe-cell.connected .hub{background:radial-gradient(circle at 35% 30%,#fff,var(--accent) 65%);box-shadow:0 0 10px color-mix(in srgb,var(--accent) 70%,transparent)}
.pipe-cell.source .hub{background:radial-gradient(circle at 35% 30%,#fff,var(--accent) 60%);box-shadow:0 0 14px var(--accent);animation:sourcePulse 1.8s ease-in-out infinite}
@keyframes sourcePulse{0%,100%{box-shadow:0 0 10px var(--accent)}50%{box-shadow:0 0 20px var(--accent)}}
/* Target cells read as an actual diamond gem, not a generic pipe hub */
.pipe-cell.target .hub{border-radius:0;width:44%;height:44%;left:28%;top:28%;background:none;clip-path:polygon(50% 4%,90% 38%,74% 96%,26% 96%,10% 38%);background:linear-gradient(155deg,#ffe6a0,#ffd166 55%,#c98f1f);box-shadow:0 0 10px #ffd16699}
.pipe-cell.target.connected .hub{background:linear-gradient(155deg,#eafff6,var(--accent) 55%,#2b9d82);box-shadow:0 0 14px color-mix(in srgb,var(--accent) 80%,transparent)}
.pipe-cell.obstacle{cursor:not-allowed;background:linear-gradient(155deg,#2a2622,#17140f);border-color:#00000030}
.pipe-cell.obstacle .rock{position:absolute;inset:18%;border-radius:20% 40% 30% 45%/40% 25% 45% 30%;background:linear-gradient(155deg,#6b5f4f,#3a3226);box-shadow:inset 0 0 0 1px #00000040,0 2px 4px #00000060}
.header-btns{display:flex;gap:8px;flex-wrap:wrap}
.stats strong.score-pop{animation:scorepop .5s ease}
@keyframes scorepop{0%{transform:scale(1.4);color:var(--accent)}100%{transform:scale(1)}}
:focus-visible{outline:3px solid var(--accent);outline-offset:2px}
.actions{display:flex;align-items:center;gap:18px;margin-top:14px}.actions p{color:var(--muted);margin:0}button,a{font:inherit}#start{border:0;border-radius:999px;background:var(--accent);color:#101522;font-weight:850;padding:12px 20px;cursor:pointer}.quiet{background:#ffffff0d;color:var(--ink);white-space:nowrap;border:0;border-radius:999px;padding:12px 20px;cursor:pointer}footer{display:flex;justify-content:space-between;gap:20px;color:var(--muted);font-size:.84rem;margin-top:28px}a{color:var(--accent);text-decoration:none}dialog{max-width:440px;max-height:88vh;overflow-y:auto;border:1px solid #ffffff20;border-radius:22px;background:#10182a;color:var(--ink);padding:28px;box-shadow:0 30px 100px #000}dialog::backdrop{background:#02040bd9}dialog button{margin-top:12px;min-height:44px}@media(max-width:600px){body{padding:10px}.shell{border-radius:20px;padding:16px}header{display:block}.quiet{margin-top:8px}.stats strong{font-size:1.15rem}}@media(prefers-reduced-motion:reduce){.pipe-icon{transition:none}.stats strong.score-pop{animation:none}}
footer a:first-child{color:var(--ink);font-weight:700}
footer a.quiet-link{color:var(--muted)}

/* Campaign mode: tabs, level select, objective bar, dialogs */
.mode-tabs{display:flex;gap:8px;margin-top:18px}
.tab{flex:1;border:1px solid #ffffff16;background:#ffffff0a;color:var(--muted);border-radius:999px;padding:10px 14px;font-weight:800;cursor:pointer;font-size:.92rem}
.tab.active{background:var(--accent);color:#101522;border-color:transparent}
.level-select{margin-top:16px;display:flex;flex-direction:column;gap:16px}
.chapter-title{font-size:.95rem;margin:0 0 8px;color:var(--ink);letter-spacing:.02em}
.level-row{display:grid;grid-template-columns:repeat(auto-fill,minmax(84px,1fr));gap:10px}
.level-btn{display:flex;flex-direction:column;align-items:center;gap:4px;border:1px solid #ffffff18;background:#ffffff0c;color:var(--ink);border-radius:16px;padding:12px 8px;cursor:pointer;min-height:76px;transition:transform .12s,background .12s}
.level-btn:hover:not(:disabled){transform:translateY(-2px);background:#ffffff16}
.level-btn.cleared{border-color:color-mix(in srgb,var(--accent) 55%,transparent)}
.level-btn.locked{opacity:.45;cursor:not-allowed}
.level-num{font-size:1.15rem;font-weight:900}
.level-kind{font-size:.68rem;color:var(--muted)}
.level-stars{font-size:.85rem;letter-spacing:.05em;color:#ffd166}
.objective{margin-top:14px;background:#ffffff0a;border:1px solid #ffffff14;border-radius:16px;padding:12px 16px}
.obj-row{display:flex;justify-content:space-between;align-items:center;font-size:.9rem}
.objective p#obj-text{margin:6px 0;color:var(--muted);font-size:.85rem}
.progress-bar{height:8px;border-radius:999px;background:#ffffff14;overflow:hidden}
.progress-bar .fill{height:100%;background:var(--accent);width:0;transition:width .25s ease}
.stars-display{font-size:1.6rem;letter-spacing:.15em;color:#ffd166;text-align:center;margin:6px 0}
.dialog-actions{display:flex;gap:10px;margin-top:12px;flex-wrap:wrap}
.dialog-actions button{margin-top:0}
.pipe-cell.just-connected{animation:pipeConnect .4s ease}
@keyframes pipeConnect{0%{transform:scale(1)}40%{transform:scale(1.18)}100%{transform:scale(1)}}
.pipe-cell.hinted{animation:hintFlash 1s ease}
@keyframes hintFlash{0%,100%{box-shadow:none}30%{box-shadow:0 0 0 3px #ffd166}}
@media(prefers-reduced-motion:reduce){.pipe-cell.hinted{animation:none;box-shadow:0 0 0 3px #ffd166}}
.level-btn{touch-action:manipulation;-webkit-tap-highlight-color:transparent}
.level-btn:active:not(:disabled){transform:scale(.96)}
@media(max-width:600px){.level-row{grid-template-columns:repeat(auto-fill,minmax(72px,1fr))}.mode-tabs{flex-direction:column}}
@media(prefers-reduced-motion:reduce){.level-btn{transition:none}.pipe-cell.just-connected{animation:none}.progress-bar .fill{transition:none}}

/* Hold-the-finished-board celebration before the level-complete popup */
.grid.solved-glow .pipe-cell.connected{animation:solvedShimmer 1.1s ease-in-out infinite}
@keyframes solvedShimmer{0%,100%{filter:brightness(1)}50%{filter:brightness(1.45)}}
.solved-banner{position:absolute;left:50%;top:10px;transform:translateX(-50%);background:color-mix(in srgb,var(--accent) 22%,#0a1120);border:1px solid color-mix(in srgb,var(--accent) 55%,transparent);color:var(--ink);font-weight:900;font-size:1rem;padding:8px 18px;border-radius:999px;box-shadow:0 10px 30px #0007;animation:bannerPop .35s ease;pointer-events:none;z-index:2}
@keyframes bannerPop{0%{opacity:0;transform:translateX(-50%) translateY(-8px) scale(.9)}100%{opacity:1;transform:translateX(-50%) translateY(0) scale(1)}}
@media(prefers-reduced-motion:reduce){.grid.solved-glow .pipe-cell.connected{animation:none}.solved-banner{animation:none}}
[hidden]{display:none!important}