@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@400;500;600;700;800&family=Space+Grotesk:wght@400;600;700&display=swap');

:root {
    --bg: #0a0f1e;
    --surface: #111827;
    --panel: #1a2235;
    --border: rgba(59,130,246,0.2);
    --primary: #3b82f6;
    --secondary: #10b981;
    --accent: #f59e0b;
    --text: #e2e8f0;
    --muted: #94a3b8;
}

*{ margin:0; padding:0; box-sizing:border-box; }

body{
    font-family:'Outfit',sans-serif;
    background:var(--bg);
    color:var(--text);
    height:100vh;
    overflow:hidden;
}

/* NAV */
.sim-nav{
    display:flex; align-items:center; justify-content:space-between;
    padding:.75rem 2rem;
    background:rgba(17,24,39,0.97);
    border-bottom:1px solid var(--border);
    position:sticky; top:0; z-index:100;
    backdrop-filter:blur(12px);
}
.nav-left{ display:flex; align-items:center; gap:1.5rem; }
.sim-logo{ display:flex; align-items:center; gap:.6rem; font-size:1.1rem; font-weight:700; color:#fff; }
.logo-thin{ font-weight:300; }
.nav-crumbs{ display:flex; align-items:center; gap:.5rem; font-size:.82rem; color:var(--muted); }
.nav-crumbs a{ color:var(--muted); text-decoration:none; transition:color .2s; }
.nav-crumbs a:hover{ color:var(--primary); }
.nav-crumbs .sep{ color:#2d3748; }
.nav-crumbs .cur{ color:var(--primary); font-weight:600; }
.nav-back{
    display:flex; align-items:center; gap:.5rem;
    padding:.4rem .9rem; border-radius:8px;
    background:rgba(59,130,246,.1); color:var(--primary);
    text-decoration:none; font-size:.82rem; font-weight:600;
    border:1px solid var(--border); transition:all .2s;
}
.nav-back:hover{ background:rgba(59,130,246,.2); }

/* LAYOUT */
.sim-wrap{
    display:grid; grid-template-columns:260px 1fr 280px;
    height:calc(100vh - 52px);
    overflow:hidden;
}
@media(max-width:1100px){ .sim-wrap{ grid-template-columns:260px 1fr; } }
@media(max-width:800px){ .sim-wrap{ grid-template-columns:1fr; height:auto; } }

/* CONTROLS (Left) */
.sim-ctrl{
    background:var(--surface); border-right:1px solid var(--border);
    padding:1.4rem; overflow-y:auto; display:flex;
    flex-direction:column; gap:1.2rem;
}
.ctrl-group{ display:flex; flex-direction:column; gap:.6rem; }
.ctrl-title{
    font-size:.7rem; font-weight:700; text-transform:uppercase;
    letter-spacing:1px; color:var(--muted);
    border-bottom:1px solid var(--border); padding-bottom:.4rem;
    display:flex; align-items:center; gap:.4rem;
}
.ctrl-title i{ color:var(--primary); }

.sol-list{ display:flex; flex-direction:column; gap:.4rem; max-height: 480px; overflow-y: auto; padding-right: 5px;}
.sol-list::-webkit-scrollbar { width: 4px; }
.sol-list::-webkit-scrollbar-thumb { background: rgba(59,130,246,0.3); border-radius: 4px; }
.sol-btn{
    padding:.65rem .9rem; border:1px solid rgba(59,130,246,0.15); border-radius:8px;
    background:rgba(255,255,255,.02); color:var(--text); font-family:'Outfit',sans-serif;
    font-size:.85rem; font-weight:500; cursor:pointer; transition:all .2s;
    text-align:left; display:flex; align-items:center; gap:.5rem;
}
.sol-btn:hover{ background:rgba(59,130,246,.08); border-color:rgba(59,130,246,.4); }
.sol-btn.active{ background:rgba(59,130,246,.15); color:var(--primary); border-color:var(--primary); box-shadow:0 0 10px rgba(59,130,246,0.1); }
.sol-icon{ font-size:1.1rem; }

.btn-primary{
    width:100%; padding:.7rem; border-radius:8px;
    background:var(--primary); color:#fff; border:none;
    font-family:'Outfit',sans-serif; font-size:.9rem;
    font-weight:600; cursor:pointer; transition:all .2s;
    display:flex; justify-content:center; align-items:center; gap:.5rem;
    box-shadow: 0 4px 12px rgba(59,130,246,0.3);
}
.btn-primary:hover{ transform:translateY(-2px); box-shadow: 0 6px 16px rgba(59,130,246,0.4); }

.reset-btn{
    width:100%; padding:.65rem; border-radius:8px;
    background:rgba(239,68,68,.1); color:#ef4444; border:1px solid rgba(239,68,68,.3);
    font-family:'Outfit',sans-serif; font-size:.85rem;
    font-weight:600; cursor:pointer; transition:all .2s; margin-top: auto;
}
.reset-btn:hover{ background:rgba(239,68,68,.2); }

/* STAGE (Center) */
.sim-stage{
    background:#040c1a;
    background-image:radial-gradient(rgba(59,130,246,.08) 1px, transparent 1px);
    background-size:30px 30px;
    display:flex; flex-direction:column;
    align-items:center; justify-content:center;
    position:relative; overflow:hidden;
}
#simCanvas{
    max-width:100%; max-height:100%;
    cursor:grab;
}
#simCanvas:active{ cursor:grabbing; }

/* INSTRUCTIONS BADGE */
.instr-badge{
    position:absolute; top:20px; left:50%; transform:translateX(-50%);
    background:rgba(17,24,39,0.8); border:1px solid var(--border);
    padding:0.6rem 1.2rem; border-radius:30px; font-size:0.9rem;
    font-weight:600; color:var(--primary); backdrop-filter:blur(8px);
    pointer-events:none; box-shadow: 0 4px 12px rgba(0,0,0,0.3);
    display:flex; align-items:center; gap:0.5rem; transition: opacity 0.3s;
}

/* READOUTS (Right) */
.sim-info{
    background:var(--surface); border-left:1px solid var(--border);
    padding:1.4rem; overflow-y:auto; display:flex;
    flex-direction:column; gap:1.2rem;
}
.rd-box{
    background:#040c1a; border:1px solid var(--border);
    border-radius:12px; padding:1.2rem;
}
.rd-lbl{ font-size:.7rem; color:var(--muted); font-weight:700; text-transform:uppercase; letter-spacing:1px; margin-bottom:.5rem; }
.rd-val{ font-family:'Space Grotesk',monospace; font-size:1.8rem; font-weight:700; color:var(--text); line-height:1.1; display:flex; align-items:baseline; gap:0.3rem;}
.rd-unit{ font-size:0.9rem; color:var(--muted); font-weight:500;}

.ph-badge{
    display:inline-block; padding:0.2rem 0.6rem; border-radius:6px;
    font-size:0.8rem; font-weight:700; margin-top:0.5rem; background:#333; color:#fff;
}

.ph-chart-container{
    background:#040c1a; border:1px solid var(--border);
    border-radius:12px; padding:1rem; flex-grow:1; display:flex; flex-direction:column;
}
.ph-chart{
    display:flex; flex-direction:column; gap:3px; flex-grow:1; margin-top:0.8rem;
}
.ph-row{
    display:flex; align-items:center; gap:0.6rem; flex-grow:1;
}
.ph-color-box{
    width:28px; height:100%; border-radius:4px; border:1px solid rgba(255,255,255,0.1);
}
.ph-num{
    font-family:'Space Grotesk',monospace; font-size:0.85rem; color:var(--muted); font-weight:600; width: 25px;
}
.ph-label{
    font-size:0.75rem; color:var(--muted); white-space:nowrap; overflow:hidden; text-overflow:ellipsis;
}

@keyframes float {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-8px); }
    100% { transform: translateY(0px); }
}
.floating { animation: float 4s ease-in-out infinite; }