/*
Theme Name: VaizdoFeed
Theme URI: https://s1.vaizdopamokos.lt
Author: Vaizdopamokos.lt
Description: Pinterest stiliaus pamokų sąrašas + Instagram Reels / YouTube Shorts stiliaus vaizdo grotuvas su tęstiniu srautu. Filtravimas pagal klasę ir dalyką.
Version: 0.2.0
Requires at least: 6.0
Requires PHP: 7.4
Text Domain: vaizdofeed
*/

:root{
  --accent:#ff2e63;
  --ink:#111418;
  --ink-soft:#5b6470;
  --line:#eceef1;
  --bg:#fff;
  --radius:16px;
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{font-family:var(--font);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
a{text-decoration:none;color:inherit}
img{display:block;max-width:100%}
button{font:inherit}

/* =======================================================================
 * HOMEPAGE — Pinterest masonry (light)
 * ==================================================================== */
body.vf-home{background:var(--bg);color:var(--ink)}

.vf-top{position:sticky;top:0;z-index:30;background:rgba(255,255,255,.92);
  backdrop-filter:saturate(180%) blur(12px);-webkit-backdrop-filter:saturate(180%) blur(12px);
  border-bottom:1px solid var(--line);padding:10px 0 8px;will-change:transform}

/* compact (scrolled) row of selected pills — absolute overlay, crossfaded by GSAP via opacity */
.vf-compactbar{display:flex;position:absolute;top:0;left:0;right:0;opacity:0;pointer-events:none;
  width:100%;border:0;background:transparent;cursor:pointer;
  align-items:center;gap:8px;padding:9px 14px;overflow-x:auto;scrollbar-width:none;-webkit-tap-highlight-color:transparent}
.vf-compactbar::-webkit-scrollbar{display:none}
.vf-compactbar .cp-logo{width:26px;height:26px;flex:0 0 auto}
.vf-compactbar .cp-pill{flex:0 0 auto;font-size:13px;font-weight:700;padding:6px 13px;border-radius:999px;
  background:#f1f2f4;color:var(--ink);white-space:nowrap}
.vf-compactbar .cp-pill.grade{background:var(--accent);color:#fff}
.vf-compactbar .cp-pill.subject{background:var(--ink);color:#fff}
.vf-compactbar .cp-pill.author{background:#3f4651;color:#fff}
.vf-compactbar .cp-hint{font-size:14px;font-weight:600;color:var(--ink-soft)}
.vf-compactbar .cp-caret{margin-left:auto;color:var(--ink-soft);font-size:13px;flex:0 0 auto}
.vf-top-inner{width:100%;max-width:100%;margin:0;padding:0 16px;display:flex;flex-direction:column;gap:10px}
.vf-head{display:flex;align-items:center;gap:12px}
.vf-logo{font-weight:800;font-size:17px;white-space:nowrap;display:flex;align-items:center;gap:6px}
.vf-logo b{color:var(--accent)}
.vf-logo img{height:32px;width:auto;display:block}
.vf-search{flex:1;position:relative}
.vf-search input{width:100%;border:0;background:#eef0f2;border-radius:999px;
  padding:12px 18px 12px 42px;font-size:15px;color:var(--ink);outline:none}
.vf-search input:focus{box-shadow:0 0 0 2px var(--accent) inset}
.vf-search::before{content:"⌕";position:absolute;left:16px;top:50%;transform:translateY(-50%);
  font-size:18px;color:var(--ink-soft)}

.vf-tags{display:flex;gap:8px;overflow-x:auto;scrollbar-width:none;-webkit-overflow-scrolling:touch}
.vf-tags::-webkit-scrollbar{display:none}
.vf-tag{flex:0 0 auto;border:0;cursor:pointer;font-size:14px;font-weight:600;color:var(--ink);
  background:#f1f2f4;padding:9px 16px;border-radius:999px;white-space:nowrap;
  transition:transform .12s ease,background .15s,color .15s}
.vf-tag:active{transform:scale(.95)}
.vf-tag.is-active{background:var(--ink);color:#fff}
.vf-tag.is-disabled{opacity:.3;pointer-events:none;cursor:default}
/* grade is multi-select: mark chosen grades with a check so a set reads as multi */
.vf-tags--grade .vf-tag[data-grade]:not([data-grade=""]).is-active::before{content:"✓\00a0";font-weight:800}
.vf-tag[data-grade].is-active{background:var(--accent);color:#fff}
/* author active pill: dark grey (WCAG AA — #fff on #3f4651 ≈ 8.5:1), distinct from topic + grade */
.vf-tag[data-author].is-active{background:#3f4651;color:#fff}

.vf-heading{max-width:1280px;margin:0 auto;padding:14px 14px 0;
  font-size:18px;font-weight:800;line-height:1.25;color:var(--ink);text-wrap:balance}
.vf-heading[hidden]{display:none}

/* Uniform grid: max 4 columns, scaling down to 1 on narrow screens.
   Thumbnails keep a fixed 16:9 ratio at every breakpoint. */
.vf-authorbar{max-width:1280px;margin:0 auto;padding:12px 14px 0;display:flex;
  align-items:center;justify-content:space-between;gap:12px;font-size:15px;color:var(--ink)}
.vf-authorbar strong{color:var(--accent)}
.vf-authorbar a{font-weight:600;color:var(--ink-soft)}

.vf-pins{display:grid;gap:14px;grid-template-columns:repeat(2,1fr);
  padding:14px 12px 60px;max-width:1280px;margin:0 auto}
@media (max-width:359px){.vf-pins{grid-template-columns:repeat(1,1fr)}}
@media (min-width:720px){.vf-pins{grid-template-columns:repeat(3,1fr)}}
@media (min-width:1080px){.vf-pins{grid-template-columns:repeat(4,1fr)}}

.vf-pin{display:flex;flex-direction:column;cursor:pointer}
.vf-pin-media{position:relative;border-radius:var(--radius);overflow:hidden;background:#e9ebee;
  aspect-ratio:16/9;transition:transform .18s ease}
.vf-pin:hover .vf-pin-media{transform:translateY(-2px)}
.vf-pin-media img{width:100%;height:100%;object-fit:cover}
/* Per-topic duotone: grayscale base mapped to a topic color via two blend overlays. */
.vf-pin-media.vf-duo img{filter:grayscale(1) contrast(.9) brightness(1.1)}
.vf-duo-shadow,.vf-duo-light{position:absolute;inset:0;pointer-events:none;opacity:.8}
.vf-duo-shadow{mix-blend-mode:screen;z-index:1}
.vf-duo-light{mix-blend-mode:multiply;z-index:1}
.vf-pin-media::after{content:"";position:absolute;inset:0;border-radius:var(--radius);
  box-shadow:inset 0 0 0 1px rgba(0,0,0,.05);z-index:3}
.vf-pin-play{z-index:2;position:absolute;right:8px;bottom:8px;width:34px;height:34px;border-radius:50%;
  background:rgba(0,0,0,.55);display:flex;align-items:center;justify-content:center}
.vf-pin-play::after{content:"";border-left:11px solid #fff;border-top:7px solid transparent;
  border-bottom:7px solid transparent;margin-left:3px}
.vf-pin-cap{padding:8px 4px 0}
.vf-pin-badges{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:5px}
.vf-mini{font-size:11px;font-weight:700;padding:3px 8px;border-radius:999px;background:#f1f2f4;color:var(--ink-soft)}
.vf-mini.grade{background:#ffe5ec;color:var(--accent)}
.vf-pin-title{font-size:13.5px;line-height:1.34;font-weight:600;margin:0;color:var(--ink);
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;text-wrap:pretty}

.vf-empty{text-align:center;color:var(--ink-soft);padding:60px 20px;font-size:15px}
.vf-loader{text-align:center;color:var(--ink-soft);padding:18px;font-size:13px;opacity:0;transition:opacity .2s}
.vf-loader.is-on{opacity:1}

/* =======================================================================
 * LESSON — Reels / Shorts player (dark)
 * ==================================================================== */
body.vf-reel{background:#0a0a0b;color:#fff;overflow:hidden}

#vf-feed{height:100dvh;overflow-y:scroll;scroll-snap-type:y mandatory;-webkit-overflow-scrolling:touch;scrollbar-width:none}
#vf-feed::-webkit-scrollbar{display:none}

.reel-card{position:relative;height:100dvh;scroll-snap-align:start;scroll-snap-stop:always;
  display:flex;align-items:center;justify-content:center}
.reel-stage{position:relative;width:min(100vw,460px);aspect-ratio:16/9;background:#000;
  border-radius:14px;overflow:hidden;box-shadow:0 20px 60px rgba(0,0,0,.5)}
@media (min-width:760px){
  /* Desktop: stretch the video to fill width, capped by height for 16:9, leaving
     side margins for the action rail + nav arrows. A bottom band (padding-bottom +
     the extra height reserve) keeps the metadata BELOW the video, never overlapping. */
  .reel-card{--stageW:min(calc(100vw - 240px), calc((100dvh - 150px) * 16 / 9));padding-bottom:110px}
  .reel-stage{width:var(--stageW)}
}
.reel-poster,.reel-player{position:absolute;inset:0;width:100%;height:100%}
.reel-poster{object-fit:cover;transition:opacity .35s}
.reel-player iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.reel-card.vf-loaded .reel-poster{opacity:0}

.reel-play{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);z-index:4;
  width:72px;height:72px;border-radius:50%;border:0;cursor:pointer;background:rgba(0,0,0,.45);
  backdrop-filter:blur(6px);display:flex;align-items:center;justify-content:center}
.reel-play::after{content:"";border-left:21px solid #fff;border-top:13px solid transparent;
  border-bottom:13px solid transparent;margin-left:5px}
.reel-card.is-playing .reel-play{opacity:0;pointer-events:none}

/* right action rail */
.reel-rail{position:absolute;right:max(10px,calc(50vw - 230px));bottom:34px;z-index:6;
  display:flex;flex-direction:column;gap:18px;align-items:center}
@media (min-width:760px){.reel-rail{right:calc(50% - var(--stageW) / 2 - 64px);bottom:40px}}
.rl{width:48px;display:flex;flex-direction:column;align-items:center;gap:4px;border:0;background:none;
  color:#fff;cursor:pointer;font-size:12px;font-weight:600}
.rl .ic{width:48px;height:48px;border-radius:50%;background:rgba(255,255,255,.13);
  backdrop-filter:blur(6px);display:flex;align-items:center;justify-content:center;font-size:22px;
  transition:transform .12s,background .15s}
.rl .ic svg{width:24px;height:24px;display:block}
.rl:active .ic{transform:scale(.88)}
.rl.is-on .ic{color:var(--accent)}
.rl.save.is-on .ic{color:#ffd23f}

/* bottom-left info */
.reel-info{position:absolute;left:max(14px,calc(50vw - 230px));bottom:34px;z-index:6;
  max-width:min(72vw,360px);text-shadow:0 1px 14px rgba(0,0,0,.6);pointer-events:none}
@media (min-width:760px){.reel-info{left:calc(50% - var(--stageW) / 2);bottom:40px;max-width:calc(var(--stageW) * 0.72)}}
.reel-author{display:flex;align-items:center;gap:9px;margin-bottom:8px;font-weight:700;font-size:14px;pointer-events:auto}
.reel-author .ava{width:32px;height:32px;border-radius:50%;background:#fff;overflow:hidden;
  display:flex;align-items:center;justify-content:center;font-size:13px;color:var(--accent)}
.reel-author .ava img{width:82%;height:82%;object-fit:contain}
.reel-author .reel-name{font-weight:700;color:#fff}
.reel-author .follow{margin-left:4px;font-size:12px;font-weight:700;border:1px solid rgba(255,255,255,.6);
  padding:3px 11px;border-radius:999px}
.reel-badges{display:flex;flex-wrap:wrap;gap:7px;margin-bottom:8px;pointer-events:auto}
.reel-badge{font-size:12px;font-weight:700;padding:4px 10px;border-radius:999px;background:rgba(255,255,255,.16);color:#fff}
.reel-badge.grade{background:var(--accent)}
.reel-badge.author{background:#3f4651}
.reel-title{margin:0;font-size:16px;line-height:1.3;font-weight:700;text-wrap:balance}

/* up/down nav (desktop) */
.reel-nav{position:fixed;right:24px;top:50%;transform:translateY(-50%);z-index:20;
  display:flex;flex-direction:column;gap:14px}
.reel-nav button{width:46px;height:46px;border-radius:50%;border:0;cursor:pointer;color:#fff;font-size:20px;
  background:rgba(255,255,255,.12);backdrop-filter:blur(6px);display:flex;align-items:center;justify-content:center;
  transition:transform .12s,background .15s}
.reel-nav button:hover{background:rgba(255,255,255,.22)}
.reel-nav button:active{transform:scale(.9)}
@media (max-width:760px),(pointer:coarse){.reel-nav{display:none}}

.vf-mute{position:fixed;top:calc(16px + env(safe-area-inset-top));right:16px;z-index:25;
  width:44px;height:44px;border-radius:50%;border:0;cursor:pointer;color:#fff;font-size:19px;
  background:rgba(0,0,0,.5);backdrop-filter:blur(6px);display:flex;align-items:center;justify-content:center}
.vf-back{position:fixed;top:calc(16px + env(safe-area-inset-top));left:16px;z-index:25;
  width:44px;height:44px;border-radius:50%;border:0;cursor:pointer;color:#fff;font-size:22px;
  background:rgba(0,0,0,.5);backdrop-filter:blur(6px);display:flex;align-items:center;justify-content:center}

.reel-loader{position:fixed;left:50%;bottom:20px;transform:translateX(-50%);z-index:5;color:rgba(255,255,255,.6);font-size:13px;opacity:0;transition:opacity .2s}
.reel-loader.is-on{opacity:1}

/* Static Pages + 404 — readable article layout */
.vf-page-top{padding:16px 20px;border-bottom:1px solid var(--line)}
.vf-page-top .vf-logo img{height:30px;width:auto;display:block}
.vf-page{max-width:760px;margin:0 auto;padding:28px 20px 80px}
.vf-page-title{font-size:30px;line-height:1.2;font-weight:800;color:var(--ink);margin:0 0 18px}
.vf-page-content{font-size:16px;line-height:1.7;color:var(--ink)}
.vf-page-content p{margin:0 0 1em}
.vf-page-content a{color:var(--accent)}
.vf-page-content img{max-width:100%;height:auto;border-radius:var(--radius)}
.vf-page-content h2{font-size:22px;margin:1.4em 0 .5em}
.vf-page-content h3{font-size:18px;margin:1.2em 0 .4em}
.vf-page-content ul,.vf-page-content ol{margin:0 0 1em;padding-left:1.3em}
.vf-page-home{display:inline-block;margin-top:8px;color:var(--accent);font-weight:700;text-decoration:none}
.vf-404 .vf-page-article{text-align:center;padding-top:40px}