/* RapidLoop Base Optimizer — theme matches rapidloop.ai */
:root{
  --bg:#070b1a; --panel:#0f1730; --panel-2:#0c1428;
  --line:rgba(255,255,255,.09); --line-2:rgba(255,255,255,.05);
  --ink:#eef2ff; --muted:#aeb9da;
  --cyan:#3de0ff; --blue:#5ea0ff; --violet:#9a6bff;
  --grad:linear-gradient(135deg,#3de0ff 0%,#5ea0ff 45%,#9a6bff 100%);
  --grad-soft:linear-gradient(135deg,rgba(61,224,255,.16),rgba(154,107,255,.16));
  --shadow:0 24px 60px -24px rgba(4,10,30,.85);
  --radius:16px;
  --font:'Inter',system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;
  --display:'Space Grotesk','Inter',system-ui,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--ink);font-family:var(--font);
  line-height:1.55;overflow-x:hidden;-webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{font-family:var(--display);font-weight:700;line-height:1.1;letter-spacing:-.02em;margin:0}
a{color:inherit;text-decoration:none}
.grad-text{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}

/* decorative orbs */
.orb{position:fixed;border-radius:50%;filter:blur(8px);z-index:0;pointer-events:none}
.orb--1{width:520px;height:520px;background:radial-gradient(circle,#1b69ff,transparent 70%);top:-200px;right:-160px;opacity:.5}
.orb--2{width:460px;height:460px;background:radial-gradient(circle,#7b3bff,transparent 70%);bottom:-220px;left:-160px;opacity:.4}

/* topbar */
.topbar{position:sticky;top:0;z-index:30;display:flex;align-items:center;justify-content:space-between;
  padding:14px clamp(16px,4vw,40px);backdrop-filter:blur(12px);
  background:rgba(7,11,26,.72);border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:10px}
.brand__name{font-family:var(--display);font-weight:700;font-size:1.12rem}
.brand__sub{color:var(--muted);font-weight:500;font-size:.86rem;margin-left:4px}
.topnav{display:flex;gap:22px;align-items:center}
.topnav a{color:var(--muted);font-weight:500;font-size:.92rem;transition:color .15s}
.topnav a:hover{color:var(--ink)}
.topnav__out{color:var(--cyan)!important}

/* hero */
.hero{position:relative;z-index:1;max-width:980px;margin:0 auto;padding:48px clamp(16px,4vw,40px) 18px;text-align:center}
.eyebrow{display:inline-block;font-family:var(--display);font-weight:600;font-size:.74rem;letter-spacing:.18em;
  text-transform:uppercase;color:var(--cyan);padding:6px 14px;border:1px solid var(--line);border-radius:100px;background:var(--grad-soft)}
.hero h1{font-size:clamp(2rem,5vw,3.4rem);margin:18px 0 0}
.lede{color:var(--muted);font-size:clamp(1rem,1.4vw,1.12rem);max-width:680px;margin:16px auto 0}

/* app layout */
.app{position:relative;z-index:1;display:grid;grid-template-columns:230px minmax(0,1fr) 270px;gap:18px;
  align-items:start;max-width:1280px;margin:18px auto 0;padding:0 clamp(12px,3vw,32px)}
.panel{background:linear-gradient(180deg,var(--panel),var(--panel-2));border:1px solid var(--line);
  border-radius:var(--radius);padding:16px;box-shadow:var(--shadow);position:sticky;top:74px}
.tool-block{margin-bottom:18px}
.tool-block:last-child{margin-bottom:0}
.tool-h{font-size:.74rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin-bottom:10px;display:flex;justify-content:space-between}
.tool-h__val{color:var(--cyan)}

/* palette */
.palette{display:flex;flex-direction:column;gap:6px}
.pitem{display:flex;align-items:center;gap:10px;padding:8px 10px;border:1px solid var(--line);border-radius:10px;
  background:rgba(255,255,255,.03);cursor:pointer;transition:border-color .15s,background .15s,transform .1s;
  font-size:.9rem;font-family:inherit;color:var(--ink)}
.pitem__name{font-weight:500}
.pitem:hover{border-color:rgba(94,160,255,.5);background:rgba(94,160,255,.08)}
.pitem.active{border-color:var(--cyan);background:var(--grad-soft);box-shadow:0 0 0 1px rgba(61,224,255,.4) inset}
.pitem__sw{width:22px;height:22px;border-radius:6px;display:grid;place-items:center;font-family:var(--display);
  font-weight:700;font-size:.62rem;color:#04122a;flex:none}
.pitem__name{flex:1;min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}

/* board */
.board{min-width:0}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-bottom:14px}
.stat{background:linear-gradient(180deg,var(--panel),var(--panel-2));border:1px solid var(--line);
  border-radius:14px;padding:12px 14px}
.stat__dot{display:inline-block;width:9px;height:9px;border-radius:50%;background:var(--d);margin-right:6px;vertical-align:middle}
.stat__v{display:block;font-family:var(--display);font-weight:700;font-size:clamp(1.1rem,2.3vw,1.7rem);letter-spacing:-.02em}
.stat__l{color:var(--muted);font-size:.74rem;letter-spacing:.06em}
.stat.neg .stat__v{color:#ff7b72}

/* grid board */
.grid{display:grid;gap:5px;background:rgba(0,0,0,.25);border:1px solid var(--line);border-radius:14px;padding:10px;
  touch-action:none;user-select:none}
.cell{position:relative;aspect-ratio:1/1;border-radius:8px;border:1px solid var(--line-2);
  display:grid;place-items:center;cursor:pointer;transition:transform .08s,box-shadow .12s;overflow:hidden}
.cell:hover{box-shadow:0 0 0 2px rgba(61,224,255,.45);z-index:2}
.cell.t-empty{background:#16203c}
.cell.t-tiberium{background:repeating-linear-gradient(45deg,#15301d,#15301d 7px,#173a22 7px,#173a22 14px)}
.cell.t-crystal{background:repeating-linear-gradient(45deg,#13243f,#13243f 7px,#16315a 7px,#16315a 14px)}
.cell.t-rock{background:#0a0f1f;background-image:radial-gradient(circle at 50% 40%,#1a2238,#0a0f1f)}
.cell.locked{outline:2px dashed rgba(240,193,75,.7);outline-offset:-3px}
/* pinned = the solver won't move it (harvesters on fields, CY, key buildings, defenses) */
.cell.pinned::after{content:"";position:absolute;top:2px;right:2px;width:7px;height:7px;border-radius:50%;
  background:radial-gradient(circle,#3de0ff,#1b7f9e);border:1px solid rgba(0,0,0,.55);z-index:3}
.cell__b{width:78%;height:78%;border-radius:6px;display:grid;place-items:center;font-family:var(--display);
  font-weight:700;font-size:clamp(.5rem,1.5vw,.8rem);color:#04122a;box-shadow:0 4px 10px -4px rgba(0,0,0,.6)}
.cell__lv{position:absolute;bottom:2px;right:3px;font-size:.56rem;font-weight:700;color:var(--ink);opacity:.85;
  text-shadow:0 1px 2px #000}
.cell__lock{position:absolute;top:2px;left:3px;font-size:.6rem}
.cell.flash{animation:flash .3s}
@keyframes flash{0%{box-shadow:0 0 0 2px #ff7b72}100%{box-shadow:none}}
.board__hint{color:var(--muted);font-size:.84rem;margin-top:12px;text-align:center}

/* controls */
.btn{font-family:var(--display);font-weight:600;font-size:.92rem;border:1px solid var(--line);border-radius:12px;
  padding:.62rem .9rem;cursor:pointer;color:var(--ink);background:rgba(255,255,255,.03);transition:transform .1s,box-shadow .15s,background .15s}
.btn:hover{transform:translateY(-1px)}
.btn--primary{background:var(--grad);color:#04122a;border:none}
.btn--primary:hover{box-shadow:0 16px 34px -12px rgba(94,160,255,.7)}
.btn--ghost:hover{background:rgba(255,255,255,.08)}
.btn--full{width:100%;margin-top:10px}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-bottom:8px}
.select{width:100%;padding:.55rem .7rem;border-radius:10px;border:1px solid var(--line);background:#0b1326;color:var(--ink);font-family:var(--font)}
input[type=range]{width:100%;accent-color:var(--blue)}

.progress{height:8px;background:rgba(255,255,255,.08);border-radius:100px;overflow:hidden;margin-top:12px}
.progress__bar{height:100%;width:0;background:var(--grad);transition:width .12s}
.opt-note{font-size:.82rem;color:var(--muted);margin-top:10px;min-height:1.2em}
.side-hint{font-size:.82rem;color:var(--muted);margin:0 0 10px;line-height:1.45}
.side-hint b{color:var(--ink)}
.opt-note.good{color:#7ee787}

.legend__items{display:flex;flex-direction:column;gap:5px;font-size:.8rem;color:var(--muted)}
.legend__row{display:flex;align-items:center;gap:8px}
.legend__sw{width:14px;height:14px;border-radius:4px;flex:none}

/* modal */
.modal{position:fixed;inset:0;z-index:50;display:grid;place-items:center;background:rgba(4,8,20,.7);backdrop-filter:blur(4px);padding:20px}
.modal[hidden]{display:none}
.modal__card{width:min(560px,100%);background:linear-gradient(180deg,var(--panel),var(--panel-2));border:1px solid var(--line);
  border-radius:18px;padding:24px;box-shadow:var(--shadow)}
.modal__p{color:var(--muted);font-size:.9rem;margin:.4rem 0 1rem}
.modal__card textarea{width:100%;border-radius:12px;border:1px solid var(--line);background:#0a1224;color:var(--ink);
  padding:12px;font-family:ui-monospace,Menlo,monospace;font-size:.82rem;resize:vertical}
.modal__msg{font-size:.84rem;margin:10px 0;min-height:1.2em;color:var(--muted)}
.modal__msg.err{color:#ff7b72}.modal__msg.ok{color:#7ee787}
.modal__actions{display:flex;gap:10px;justify-content:flex-end;margin-top:8px}
code{background:rgba(255,255,255,.07);padding:1px 6px;border-radius:6px;font-size:.84em}

/* content sections */
.content{position:relative;z-index:1;max-width:1080px;margin:64px auto 0;padding:0 clamp(16px,4vw,40px)}
.content h2{font-size:clamp(1.5rem,3vw,2.1rem);margin-bottom:22px}
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px}
.card{background:linear-gradient(180deg,var(--panel),var(--panel-2));border:1px solid var(--line);border-radius:16px;padding:20px}
.card__no{font-family:var(--display);font-weight:700;color:var(--cyan);letter-spacing:.1em;font-size:.9rem}
.card h4{margin:10px 0 8px;font-size:1.1rem}
.card p{color:var(--muted);font-size:.92rem;margin:0}
.mech{list-style:none;padding:0;margin:0;display:grid;gap:10px;max-width:820px}
.mech li{background:rgba(255,255,255,.02);border:1px solid var(--line);border-radius:12px;padding:12px 16px;color:var(--muted)}
.mech b{color:var(--ink)}
.guide{counter-reset:step;list-style:none;padding:0;margin:0;display:grid;gap:12px;max-width:880px}
.guide li{position:relative;counter-increment:step;background:rgba(255,255,255,.02);border:1px solid var(--line);
  border-radius:12px;padding:14px 16px 14px 56px;color:var(--muted)}
.guide li::before{content:counter(step);position:absolute;left:14px;top:14px;width:28px;height:28px;border-radius:9px;
  display:grid;place-items:center;font-family:var(--display);font-weight:700;color:#04122a;background:var(--grad)}
.guide b{color:var(--ink)}
.guide a{color:var(--cyan)}
.disclaimer{color:var(--muted);font-size:.8rem;margin-top:22px;max-width:820px;opacity:.8}

/* footer */
.foot{position:relative;z-index:1;display:flex;justify-content:space-between;align-items:center;gap:12px;
  max-width:1080px;margin:56px auto 30px;padding:18px clamp(16px,4vw,40px);border-top:1px solid var(--line);color:var(--muted);font-size:.88rem}
.foot a{color:var(--cyan)}
.toast{padding:8px 14px;border-radius:10px;background:var(--grad-soft);border:1px solid var(--line);color:var(--ink);font-size:.86rem}

/* responsive */
@media(max-width:980px){
  .app{grid-template-columns:1fr}
  .panel{position:static}
  .tools,.side{order:2}
  .board{order:1}
  .palette{flex-direction:row;flex-wrap:wrap}
  .pitem{flex:1 1 calc(50% - 6px)}
}
@media(max-width:520px){
  .stats{grid-template-columns:repeat(2,1fr)}
  .topnav a:not(.topnav__out){display:none}
}