feat: fix gradient background scrolling by making it fixed and ensuring full page height

Set background-attachment:fixed on body gradient to prevent it from scrolling with content. Add min-height:100vh to body and min-height:100% to html to ensure gradient covers full viewport. Add min-height:calc(100vh - 64px) to main to maintain full-height layout accounting for header.

templates/index.html

@@ -56,7 +56,7 @@ if(downloadBody){fetchDownloads();setInterval(fetchDownloads,4000)}
 </style>
 <style>
 :root{--accent:#f4c430;--accent-blue:#60a9e6;--surface:rgba(35,37,42,.82);--surface-strong:#282b31;--border-soft:rgba(255,255,255,.09)}
-body{background:radial-gradient(circle at 10% -15%,rgba(96,169,230,.12),transparent 33%),radial-gradient(circle at 90% 0%,rgba(244,196,48,.07),transparent 28%),#151619;letter-spacing:.01em}
+html,body{min-height:100%;background:#151619}body{min-height:100vh;background:radial-gradient(circle at 10% -15%,rgba(96,169,230,.12),transparent 33%),radial-gradient(circle at 90% 0%,rgba(244,196,48,.07),transparent 28%),#151619;background-attachment:fixed;letter-spacing:.01em}
 header{height:64px;background:rgba(31,33,38,.9);backdrop-filter:blur(18px);border-bottom:1px solid var(--border-soft);box-shadow:0 8px 30px rgba(0,0,0,.2);position:sticky;top:0;z-index:20}.logo{font-size:23px;text-shadow:0 0 18px rgba(244,196,48,.24)}.head-title{font-size:14px;letter-spacing:.01em}.head-sub{color:#9da5b2}
 main{max-width:1800px;margin:0 auto;padding:18px 20px 42px}.nav{gap:6px;margin:0 0 16px;padding:4px;border:1px solid var(--border-soft);border-radius:9px;background:rgba(31,33,38,.72);box-shadow:0 8px 24px rgba(0,0,0,.12)}.nav button{padding:9px 14px;border-radius:6px;color:#aeb5c1}.nav button.active{background:linear-gradient(135deg,#3a3f48,#2d3139);box-shadow:inset 0 1px rgba(255,255,255,.08),0 4px 12px rgba(0,0,0,.18);color:#fff}.nav button.active::after{content:"";display:block;height:2px;margin:6px 2px -4px;border-radius:2px;background:var(--accent-blue)}
 .toolbar{padding:10px;border:1px solid var(--border-soft);border-radius:10px;background:rgba(35,37,42,.72);box-shadow:0 10px 28px rgba(0,0,0,.14);gap:9px}.toolbar input,.toolbar select{background:#2b2e34;border-color:#474d57;transition:border-color .2s,box-shadow .2s,background .2s}.toolbar input:focus,.toolbar select:focus{outline:none;background:#30343b;border-color:var(--accent-blue);box-shadow:0 0 0 3px rgba(96,169,230,.14)}
@@ -64,6 +64,7 @@ main{max-width:1800px;margin:0 auto;padding:18px 20px 42px}.nav{gap:6px;margin:0
 .tablewrap{border:1px solid var(--border-soft);border-radius:10px;background:rgba(31,33,38,.84);box-shadow:0 14px 34px rgba(0,0,0,.2)}table{border-spacing:0}thead th{height:38px;background:linear-gradient(180deg,#30343b,#292c32);color:#bfc6d1;text-transform:uppercase;letter-spacing:.07em;font-size:10px}tbody td{height:42px;border-bottom-color:rgba(255,255,255,.075)}tbody tr{transition:background .2s,transform .2s}tbody tr:hover{background:rgba(96,169,230,.065);transform:translateX(1px)}.title{font-size:13px}.quality{box-shadow:0 0 12px rgba(21,148,71,.18)}
 #rescan{padding:9px 13px;background:linear-gradient(135deg,#343943,#292c32);border-color:#515865;box-shadow:0 5px 16px rgba(0,0,0,.18);transition:transform .2s,box-shadow .2s,border-color .2s}#rescan:hover{transform:translateY(-2px);border-color:var(--accent-blue);box-shadow:0 8px 20px rgba(0,0,0,.28)}
 @media(max-width:760px){header{padding:0 12px}.head-sub{display:none}main{padding:12px}.toolbar{grid-template-columns:1fr}.actions{margin-left:auto}.nav{overflow-x:auto}.nav button{white-space:nowrap}.tablewrap{overflow-x:auto}table{min-width:900px}}
+main{min-height:calc(100vh - 64px)}
 </style>
 <script>
 document.querySelectorAll('details.series tbody').forEach(tbody=>{let currentSeason=null;[...tbody.querySelectorAll('tr')].forEach(row=>{if(row.classList.contains('season-divider'))return;const match=row.querySelector('.title')?.textContent.match(/^S(\d{2})E\d{2}/i);if(!match||match[1]===currentSeason)return;currentSeason=match[1];const divider=document.createElement('tr');divider.className='season-divider';divider.innerHTML=`<td colspan="7">Staffel ${Number(currentSeason)}</td>`;tbody.insertBefore(divider,row)})});