/* ═══════════════════════════════════════════════════
   BLACK HOLE COLLISION — css/collision.css
   3-Body gravitational problem
   ═══════════════════════════════════════════════════ */
:root {
    --co-primary:  #8844ff;
    --co-accent:   #aa66ff;
    --co-glow:     #6622cc;
    --co-hot:      #ff4444;
    --co-bg:       #020204;
    --co-surface:  rgba(136,68,255,0.06);
    --co-border:   rgba(136,68,255,0.22);
    --co-text:     #e0dce8;
    --co-text-dim: rgba(224,220,232,0.50);
}
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html,body{width:100%;height:100vh;overflow:hidden;background:var(--co-bg);color:var(--co-text);font-family:'Inter',sans-serif;-webkit-font-smoothing:antialiased}

/* loading */
.co-loading{position:fixed;inset:0;z-index:9999;display:flex;flex-direction:column;align-items:center;justify-content:center;background:var(--co-bg);transition:opacity .6s,visibility .6s}
.co-loading.co-loading--hidden{opacity:0;visibility:hidden;pointer-events:none}
.co-loading-core{position:relative;width:100px;height:100px;margin-bottom:28px}
.co-loading-ring{position:absolute;inset:0;border-radius:50%;border:1.5px solid transparent}
.co-loading-ring--1{border-top-color:var(--co-primary);animation:coSpin 2s linear infinite}
.co-loading-ring--2{inset:16px;border-top-color:var(--co-accent);animation:coSpin 1.2s linear infinite reverse}
.co-loading-hole{position:absolute;top:50%;left:50%;width:20px;height:20px;transform:translate(-50%,-50%);background:#000;border-radius:50%;box-shadow:0 0 20px 8px rgba(136,68,255,0.4),0 0 40px 16px rgba(136,68,255,0.15)}
@keyframes coSpin{to{transform:rotate(360deg)}}
.co-loading-label{font-family:'Rajdhani',sans-serif;font-size:13px;letter-spacing:2px;text-transform:uppercase;color:var(--co-text-dim);margin-bottom:16px}
.co-loading-bar{width:200px;height:2px;background:rgba(136,68,255,0.15);border-radius:2px;overflow:hidden}
.co-loading-bar-fill{height:100%;width:0;background:var(--co-primary);transition:width .3s}

/* navbar */
.co-navbar{position:fixed;top:0;left:0;right:0;height:52px;z-index:100;display:flex;align-items:center;justify-content:space-between;padding:0 18px;background:rgba(2,2,4,0.85);backdrop-filter:blur(12px);border-bottom:1px solid var(--co-border)}
.co-nav-logo{display:flex;align-items:center;gap:8px}
.co-logo-icon{color:var(--co-primary)}
.co-logo-text{font-family:'Cinzel',serif;font-size:15px;font-weight:600;letter-spacing:2px;color:var(--co-text)}
.co-nav-center{display:flex;align-items:center}
.co-nav-title{font-family:'Cinzel',serif;font-size:13px;letter-spacing:3px;text-transform:uppercase;color:var(--co-text)}
.co-nav-controls{display:flex;gap:6px}
.co-btn{display:inline-flex;align-items:center;gap:4px;padding:5px 10px;font-family:'Rajdhani',sans-serif;font-size:11px;font-weight:500;letter-spacing:1px;text-transform:uppercase;color:var(--co-text-dim);background:rgba(136,68,255,0.08);border:1px solid var(--co-border);border-radius:4px;cursor:pointer;transition:all .25s;text-decoration:none}
.co-btn:hover{color:var(--co-text);background:rgba(136,68,255,0.18);border-color:rgba(136,68,255,0.45)}
.co-btn.active{color:#fff;background:rgba(136,68,255,0.30);border-color:var(--co-primary);box-shadow:0 0 12px rgba(136,68,255,0.25)}

/* viewport */
.co-viewport{position:fixed;inset:0;z-index:1}
.co-viewport canvas{display:block;width:100%;height:100%}

/* corner frames */
.co-frame{position:fixed;z-index:50;width:36px;height:36px;border-color:var(--co-primary);border-style:solid;opacity:.2;pointer-events:none}
.co-frame--tl{top:62px;left:10px;border-width:1px 0 0 1px}
.co-frame--tr{top:62px;right:10px;border-width:1px 1px 0 0}
.co-frame--bl{bottom:48px;left:10px;border-width:0 0 1px 1px}
.co-frame--br{bottom:48px;right:10px;border-width:0 1px 1px 0}

/* phase overlay */
.co-phase{position:fixed;top:70px;left:50%;transform:translateX(-50%);z-index:60;text-align:center;pointer-events:none}
.co-phase-name{font-family:'Cinzel',serif;font-size:22px;font-weight:700;letter-spacing:6px;text-transform:uppercase;color:#fff;text-shadow:0 0 30px var(--co-primary);opacity:0;animation:coPhaseIn 1.5s ease forwards}
.co-phase-sub{font-family:'JetBrains Mono',monospace;font-size:11px;color:var(--co-text-dim);margin-top:4px;letter-spacing:1px;opacity:0;animation:coPhaseIn 1.5s ease .3s forwards}
@keyframes coPhaseIn{to{opacity:1}}

/* stats panel */
.co-stats-panel{position:fixed;top:64px;left:14px;width:200px;max-height:calc(100vh - 140px);z-index:60;padding:14px;background:rgba(2,2,4,0.85);backdrop-filter:blur(8px);border:1px solid var(--co-border);border-radius:6px;overflow-y:auto;scrollbar-width:thin}
.co-panel-title{font-family:'Rajdhani',sans-serif;font-size:11px;font-weight:600;letter-spacing:2px;text-transform:uppercase;color:var(--co-primary);margin-bottom:10px;padding-bottom:6px;border-bottom:1px solid var(--co-border)}
.co-body-block{margin-bottom:10px;padding:6px 0;border-bottom:1px solid rgba(136,68,255,0.08)}
.co-body-label{font-family:'Rajdhani',sans-serif;font-size:11px;font-weight:600;letter-spacing:1px;text-transform:uppercase;margin-bottom:4px}
.co-body-row{display:flex;justify-content:space-between;font-size:10px;padding:1px 0}
.co-body-key{font-family:'Rajdhani',sans-serif;color:var(--co-text-dim);text-transform:uppercase;letter-spacing:.5px}
.co-body-val{font-family:'JetBrains Mono',monospace;color:var(--co-text)}
.co-energy-row{display:flex;justify-content:space-between;align-items:baseline;padding:4px 0}
.co-energy-lbl{font-family:'Rajdhani',sans-serif;font-size:10px;text-transform:uppercase;letter-spacing:1px;color:var(--co-text-dim)}
.co-energy-val{font-family:'JetBrains Mono',monospace;font-size:10px;color:var(--co-accent)}

/* math panel */
.co-math-panel{position:fixed;z-index:80;top:64px;right:14px;width:360px;max-height:calc(100vh - 140px);background:rgba(2,2,4,0.92);backdrop-filter:blur(14px);border:1px solid var(--co-border);border-radius:8px;padding:20px 22px;overflow-y:auto;scrollbar-width:thin;scrollbar-color:var(--co-border) transparent;transform:translateY(16px);opacity:0;visibility:hidden;transition:all .35s}
.co-math-panel.open{transform:translateY(0);opacity:1;visibility:visible}
.co-panel-close{position:absolute;top:10px;right:12px;background:none;border:none;color:var(--co-text-dim);font-size:16px;cursor:pointer;transition:color .2s}
.co-panel-close:hover{color:var(--co-primary)}
.co-math-content h4{font-family:'Cinzel',serif;font-size:13px;font-weight:600;color:var(--co-accent);margin:14px 0 6px}
.co-math-content h4:first-child{margin-top:0}
.co-math-content p{font-size:12px;line-height:1.7;color:rgba(224,220,232,0.8);margin-bottom:8px}
.co-math-content code{font-family:'JetBrains Mono',monospace;font-size:11px;color:var(--co-primary);background:rgba(136,68,255,0.08);padding:1px 5px;border-radius:3px}

/* telemetry */
.co-telemetry{position:fixed;top:64px;right:14px;z-index:60;display:flex;flex-direction:column;gap:3px;padding:10px 12px;background:rgba(2,2,4,0.7);border:1px solid var(--co-border);border-radius:4px}
.co-tele-row{display:flex;align-items:baseline;gap:10px}
.co-tele-lbl{font-family:'Rajdhani',sans-serif;font-size:9px;font-weight:600;letter-spacing:1.5px;text-transform:uppercase;color:var(--co-text-dim);min-width:42px}
.co-tele-val{font-family:'JetBrains Mono',monospace;font-size:10px;color:var(--co-accent)}

/* gravitational wave bar */
.co-gw-bar{position:fixed;bottom:52px;left:50%;transform:translateX(-50%);z-index:60;display:flex;align-items:center;gap:8px;padding:6px 14px;background:rgba(2,2,4,0.8);backdrop-filter:blur(8px);border:1px solid var(--co-border);border-radius:20px}
.co-gw-label{font-family:'Rajdhani',sans-serif;font-size:9px;letter-spacing:1px;text-transform:uppercase;color:var(--co-text-dim)}
.co-gw-track{width:120px;height:4px;background:rgba(136,68,255,0.12);border-radius:2px;overflow:hidden}
.co-gw-fill{height:100%;width:0;background:linear-gradient(90deg,var(--co-primary),var(--co-hot));border-radius:2px;transition:width .2s}
.co-gw-val{font-family:'JetBrains Mono',monospace;font-size:10px;color:var(--co-accent);min-width:40px}

/* footer */
.co-footer{position:fixed;bottom:0;left:0;right:0;height:32px;z-index:90;background:rgba(2,2,4,0.92);border-top:1px solid var(--co-border);overflow:hidden;display:flex;align-items:center}
.co-footer-inner{width:100%;overflow:hidden}
.co-marquee{overflow:hidden;white-space:nowrap}
.co-marquee-track{display:inline-block;animation:coMarquee 45s linear infinite}
.co-quote{font-family:'Noto Sans Devanagari','Inter',sans-serif;font-size:11px;color:var(--co-text-dim);padding:0 10px}
.co-sep{color:var(--co-primary);opacity:.4;padding:0 6px;font-size:10px}
@keyframes coMarquee{0%{transform:translateX(0)}100%{transform:translateX(-50%)}}

/* responsive */
@media(max-width:860px){.co-stats-panel{display:none}.co-math-panel{width:calc(100vw - 24px);right:12px}.co-telemetry{display:none}}
@media(max-width:640px){.co-navbar{padding:0 8px;height:46px}.co-nav-title{font-size:10px;letter-spacing:1px}.co-btn{padding:4px 6px;font-size:10px}.co-gw-bar{display:none}}