/* Palette */

:root{
  --bg:#04110b;
  --bg-grad-a:#061912;
  --bg-grad-b:#030a07;
  --panel:rgba(9,24,18,.72);
  --ink:#eaf6f0;
  --muted:#b8d2c4;
  --title:#e0ffe9;
  --section:#78f0b9;
  --underline:linear-gradient(90deg,#78f0b9,transparent);
  --ring:#5fe3b0;
  --ring-glow:rgba(120,240,185,.35);
  --ring-fill:radial-gradient(circle at 30% 30%, rgba(120,240,185,.15), transparent 70%);
  --grad:linear-gradient(90deg,#e8ffcf,#aef6d5,#78f0b9);
  --tab-ink:#d8ffe9;
  --coin-glow:rgba(255,240,180,.45);
  --coin-core:rgba(255,223,128,.18);
  --border:rgba(120,240,185,.18);
  --shadow:rgba(0,0,0,.55);
  --grid:rgba(120,240,185,.06);
  --spark:rgba(255,243,200,.7);
  --header-grad:linear-gradient(180deg, rgba(6,18,13,.9), rgba(6,18,13,.6), transparent);
  --footer-grad:linear-gradient(0deg, rgba(6,18,13,.8), transparent);
}
/* header sheen */
.codex-header::after{content:''; position:absolute; left:-20%; right:-20%; top:-120%; height:300%;
  background: radial-gradient(ellipse at 50% 0%, rgba(120,240,185,.08), transparent 60%);
  animation: float 10s ease-in-out infinite; pointer-events:none;}
@keyframes float{0%,100%{{transform: translateY(0)}} 50%{{transform: translateY(10px)}}}


/* Base */
*{box-sizing:border-box}
html,body{height:100%}
body{margin:0; font-family:Inter,system-ui,Segoe UI,Roboto,Helvetica,Arial; line-height:1.7; color:var(--ink); background:var(--bg);}
h1,h2,h3{font-family:'Playfair Display',serif}
#bgFX{position:fixed; inset:0; z-index:0; display:block}

.codex-header{position:sticky; top:0; z-index:5; padding:18px clamp(12px,3vw,36px); backdrop-filter: blur(10px); background: var(--header-grad); border-bottom:1px solid var(--border); box-shadow: 0 10px 60px var(--shadow);}
.tabs-rail{display:flex; align-items:center; justify-content:center; gap: clamp(12px,3vw,44px);}

.tab{position:relative; border:0; cursor:pointer; background:transparent; color:var(--tab-ink); text-transform:uppercase; letter-spacing:.9px; font-weight:800; padding:14px 20px; isolation:isolate;}
.tab .ring{position:absolute; inset:-6px; border-radius:999px; border:2px solid var(--ring); box-shadow: 0 0 30px var(--ring-glow) inset, 0 0 40px var(--ring-glow); transition: transform .5s ease, box-shadow .5s ease, background .5s ease; pointer-events:none;}
.tab.half.left .ring{clip-path: inset(0 50% 0 0 round 999px)}
.tab.half.right .ring{clip-path: inset(0 0 0 50% round 999px)}
.tab:hover .ring{transform: translateZ(0) scale(1.02)}
.tab.active .ring{background: var(--ring-fill);}
.tab .tab-label{position:relative; font-size: clamp(12px,1.6vw,14px);}
.tab.active .tab-label{background: var(--grad); -webkit-background-clip: text; background-clip:text; color: transparent;}

.crest-coin{width:68px; height:68px; position:relative; display:grid; place-items:center; filter: drop-shadow(0 0 18px var(--coin-glow));}
.crest-coin::before, .crest-coin::after{content:""; position:absolute; inset:-8px; border-radius:50%; border:1px solid var(--ring); opacity:.8; box-shadow: 0 0 20px var(--ring-glow);}
.coin-3d{width:62px; height:62px; border-radius:50%; background: radial-gradient(circle at 30% 30%, var(--coin-core), transparent 70%); display:grid; place-items:center; overflow:hidden; animation: omni 12s linear infinite;}
.coin-3d img{width:86%; height:86%; object-fit:contain; filter: drop-shadow(0 0 10px var(--coin-glow))}

.codex-main{position:relative; z-index:1; padding: clamp(16px,3.5vw,48px)}
.doc{display:none; background: var(--panel); border:1px solid var(--border); border-radius:24px; padding: clamp(16px,2.8vw,36px); box-shadow: 0 30px 90px var(--shadow); animation: fadeIn .6s ease forwards;}
.doc.active{display:block}

.doc-title{font: 700 clamp(20px,3.2vw,34px) 'Playfair Display',serif; color:var(--title); letter-spacing:.3px; margin:.2rem 0 .4rem}
.last-updated{color:var(--muted); margin-top:0}
.section-head{margin: 1.4rem 0 .4rem; font: 600 clamp(16px,2.2vw,22px) 'Playfair Display',serif; color: var(--section); position:relative}
.section-head::after{content:''; position:absolute; left:0; bottom:-6px; width:86px; height:2px; background: var(--underline);}
p{margin:.5rem 0; color: var(--ink)}
p.spacer{opacity:0}

.codex-footer{text-align:center; color:var(--muted); padding:30px 20px; border-top:1px solid var(--border); background:var(--footer-grad)}

.progress{height:2px; background:transparent; width:100%; margin-top:10px}
.progress span{display:block; height:100%; width:0; background: var(--grad); box-shadow: 0 0 10px var(--ring-glow);}

@keyframes fadeIn{from{opacity:0; transform: translateY(6px)} to{opacity:1; transform: translateY(0)}}
@keyframes omni{0%{transform: rotateX(0deg) rotateY(0deg)} 50%{transform: rotateX(180deg) rotateY(90deg)} 100%{transform: rotateX(360deg) rotateY(180deg)}}

/* Theme background/FX */
/* emerald anims included in palette block */

.tab:focus-visible{outline:2px dashed var(--ring); outline-offset:4px}