*{box-sizing:border-box;}
:root{--kyyeu-accent:#4ADE9B; --kyyeu-heading-font:'Cormorant Garamond',serif; --kyyeu-heading-scale:1;}
html{background:#0A0C0F;}
body{margin:0; color:#D8DEE2; font-family:'Literata',serif; line-height:1.8; overflow-x:hidden;
  background:var(--kyyeu-bg, linear-gradient(180deg,#080A0D 0%,#101419 60%,#0A0C0F 100%));}
.wrap{max-width:720px; margin:0 auto; position:relative; z-index:3;}
@media (prefers-reduced-motion: reduce){ .scanlines,.crt-overlay,.tracking-bar,.rec-dot{animation:none !important;} }

/* NHIỄU CRT + SỌC QUÉT */
.crt-overlay{position:fixed; inset:0; z-index:2; pointer-events:none; opacity:.05;
  background-image:radial-gradient(rgba(255,255,255,.85) .5px, transparent .5px); background-size:2px 2px;
  animation:crtNoise .35s steps(3) infinite;}
@keyframes crtNoise{0%{transform:translate(0,0);} 33%{transform:translate(-1px,1px);} 66%{transform:translate(1px,-1px);} 100%{transform:translate(0,0);}}
.scanlines{position:fixed; inset:0; z-index:2; pointer-events:none; opacity:.22;
  background:repeating-linear-gradient(180deg, rgba(0,0,0,.5) 0 1px, transparent 1px 3px);
  animation:scanRoll 8s linear infinite;}
@keyframes scanRoll{0%{background-position-y:0;} 100%{background-position-y:60px;}}

/* HUD VHS */
.cover{padding:26px 20px 30px; position:relative; z-index:3;}
.vhs-hud{max-width:440px; margin:0 auto 18px; display:flex; justify-content:space-between; align-items:center;
  font-family:'Courier New',monospace; font-size:12.5px; letter-spacing:.1em; color:var(--kyyeu-accent);}
.hud-rec{display:flex; align-items:center; gap:7px;}
.rec-dot{width:9px; height:9px; border-radius:50%; background:#E24A4A; animation:recBlink 1.4s ease-in-out infinite;}
@keyframes recBlink{0%,100%{opacity:1;} 50%{opacity:.15;}}
.hud-sp{opacity:.7;}

/* TV / MÀN HÌNH BĂNG */
.tv-set{max-width:440px; margin:0 auto 26px;}
.tv-screen{position:relative; aspect-ratio:4/3; background:#000; border-radius:14px; overflow:hidden;
  border:12px solid #23282E; box-shadow:0 0 0 3px #14181C, 0 26px 54px rgba(0,0,0,.65), inset 0 0 60px rgba(0,0,0,.85);}
.tape-reel{position:absolute; inset:0;}
.tape-frame{position:absolute; inset:0; width:100%; height:100%; object-fit:cover; opacity:0;
  filter:saturate(1.18) contrast(1.08) brightness(.94); transition:opacity .35s ease;}
.tape-frame.on{opacity:1;}
.tape-frame.glitching{filter:saturate(1.6) contrast(1.3) hue-rotate(8deg); transform:translateX(3px) skewX(-.6deg);}
.tracking-bar{position:absolute; left:0; right:0; height:26px; pointer-events:none; opacity:0;
  background:linear-gradient(180deg, transparent, rgba(255,255,255,.22), rgba(0,0,0,.35), transparent);
  animation:trackRoll 7s linear infinite;}
@keyframes trackRoll{
  0%{top:-30px; opacity:0;} 6%{opacity:.9;} 40%{top:110%; opacity:.5;} 41%,100%{opacity:0; top:110%;}
}
.screen-glare{position:absolute; inset:0; pointer-events:none;
  background:radial-gradient(ellipse 70% 50% at 30% 18%, rgba(255,255,255,.1), transparent 60%);}
.tape-caption{position:absolute; left:12px; bottom:12px; font-family:'Courier New',monospace; font-size:12px;
  color:#EAF4EE; text-shadow:0 0 6px rgba(0,0,0,.9); letter-spacing:.06em;}

.tv-controls{display:flex; justify-content:center; gap:10px; margin-top:16px;}
.vhs-btn{background:#1C2126; border:1px solid #333A41; color:#B8C2C8; padding:9px 16px;
  font-family:'Courier New',monospace; font-size:11.5px; letter-spacing:.09em; cursor:pointer; border-radius:3px;
  transition:background .25s ease, color .25s ease, box-shadow .25s ease;}
.vhs-btn:hover{background:#262D34; color:#fff;}
.vhs-btn.play.active{background:var(--kyyeu-accent); color:#08120C; box-shadow:0 0 18px rgba(74,222,155,.4);}
.tv-brand{text-align:center; margin-top:12px; font-family:'Courier New',monospace; font-size:10.5px;
  letter-spacing:.24em; color:#5A666E;}
.tv-brand span{color:var(--kyyeu-accent);}

/* NHÃN BĂNG */
.tape-label{max-width:440px; margin:0 auto; background:#E8E4D6; color:#1A1E22; border-radius:4px;
  padding:20px 22px; box-shadow:0 14px 30px rgba(0,0,0,.45); transform:rotate(-.5deg);}
.label-strip{display:block; font-family:'Courier New',monospace; font-size:9.5px; letter-spacing:.3em;
  color:#7A756A; border-bottom:1px solid #C9C4B4; padding-bottom:8px; margin-bottom:12px;}
.tape-label h1{font-family:var(--kyyeu-heading-font); font-weight:600;
  font-size:calc(34px * var(--kyyeu-heading-scale)); margin:0 0 6px; color:#1A1E22;}
.label-note{font-family:'Courier New',monospace; font-size:12.5px; color:#4A5158; margin:0 0 8px;}
.cover-meta{margin:0; font-size:12.5px; color:#6A7178;}

.section{padding:52px 24px 8px; position:relative; z-index:3;}
.section-head{text-align:center; margin-bottom:28px;}
.section h2{font-family:var(--kyyeu-heading-font); font-weight:600;
  font-size:calc(27px * var(--kyyeu-heading-scale)); color:var(--kyyeu-accent); margin:0 0 6px;}
.section .sub{font-size:12.5px; color:#7A868E; font-family:'Courier New',monospace;}

/* MỤC LỤC BĂNG */
.tape-index{max-width:500px; margin:0 auto; border:1px solid #262D34; border-radius:4px; background:rgba(255,255,255,.02);}
.tape-row{display:flex; gap:18px; padding:13px 20px; border-bottom:1px solid #1E242A;}
.tape-row:last-child{border-bottom:none;}
.tape-row:hover{background:rgba(74,222,155,.05);}
.tr-time{font-family:'Courier New',monospace; font-size:12.5px; color:var(--kyyeu-accent); min-width:74px; flex-shrink:0;}
.tr-title{font-size:14px; color:#D8DEE2;}

/* KHUNG HÌNH ĐÃ LƯU */
.still-strip{display:grid; grid-template-columns:repeat(3,1fr); gap:14px;}
.vhs-still{margin:0; position:relative; background:#000; border:1px solid #262D34; border-radius:3px; overflow:hidden;
  opacity:0; transform:translateY(16px); transition:opacity .8s ease var(--d), transform .8s ease var(--d);}
.vhs-still.rolled{opacity:1; transform:translateY(0);}
.vhs-still img{width:100%; height:120px; object-fit:cover; display:block;
  filter:saturate(1.14) contrast(1.05) brightness(.93); transition:filter .4s ease;}
.vhs-still:hover img{filter:saturate(1.4) contrast(1.15) hue-rotate(6deg);}
.still-ts{position:absolute; top:6px; right:8px; font-family:'Courier New',monospace; font-size:10px;
  color:var(--kyyeu-accent); text-shadow:0 0 5px rgba(0,0,0,.9);}
.vhs-still figcaption{padding:8px 10px; font-size:11.5px; color:#98A4AC; background:#12171B;}
@media(max-width:600px){.still-strip{grid-template-columns:repeat(2,1fr);}}

.see-full{text-align:center; margin:32px 0 0;}
.see-full a{font-family:'Courier New',monospace; font-size:13px; letter-spacing:.08em; color:var(--kyyeu-accent);
  text-decoration:none; border-bottom:1px solid rgba(74,222,155,.45); padding-bottom:3px;}

/* MỘT THỜI ĐÃ QUA */
.nostalgia-grid{display:grid; grid-template-columns:1fr 1fr; gap:14px; max-width:560px; margin:0 auto;}
.nos-card{background:rgba(255,255,255,.03); border-left:2px solid var(--kyyeu-accent); padding:16px 18px;}
.nos-card strong{display:block; font-size:14.5px; color:#D8DEE2; margin-bottom:5px;}
.nos-card span{font-size:12.5px; color:#7A868E; font-style:italic;}
@media(max-width:560px){.nostalgia-grid{grid-template-columns:1fr;}}

/* LỜI GHI VỎ BĂNG */
.sleeve-notes{max-width:520px; margin:0 auto;}
.sleeve-note{background:#E8E4D6; color:#1A1E22; padding:16px 20px; margin-bottom:14px; border-radius:3px;
  box-shadow:0 8px 20px rgba(0,0,0,.4); transform:rotate(-.4deg);}
.sleeve-note:nth-child(even){transform:rotate(.5deg);}
.sleeve-note p{margin:0 0 8px; font-size:14px;}
.sleeve-note cite{font-family:'Courier New',monospace; font-style:normal; font-size:12px; color:#5A6168;}

.share{margin:58px 24px 30px; padding:40px 26px; text-align:center; border:1px solid #262D34;
  background:rgba(255,255,255,.02); position:relative; z-index:3;}
.share h2{font-family:var(--kyyeu-heading-font); font-size:25px; margin:0 0 8px; color:var(--kyyeu-accent);}
.share p{font-size:13px; margin:0 0 20px; color:#7A868E;}
#qrcode{background:#fff; display:inline-block; padding:9px; margin-bottom:16px;}
.link-row{display:flex; justify-content:center; gap:8px; flex-wrap:wrap; font-size:12px;}
.link-row code{background:rgba(74,222,155,.09); padding:7px 13px; color:var(--kyyeu-accent); font-family:'Courier New',monospace;}
.link-row button{background:var(--kyyeu-accent); color:#08120C; border:none; padding:7px 15px;
  font-family:'Courier New',monospace; font-size:11.5px; font-weight:700; cursor:pointer; letter-spacing:.06em;}

.foot{text-align:center; font-size:11px; color:#4A555C; padding:0 20px 44px; font-family:'Courier New',monospace;
  letter-spacing:.06em; position:relative; z-index:3;}

/* ============ NÂNG CẤP PREMIUM ============ */
/* Bảng màu bổ sung: hồng magenta + xanh cyan của lỗi màu băng từ */
:root{--vhs-magenta:#FF4D8F; --vhs-cyan:#4DE0FF;}

/* Tách màu RGB (chromatic aberration) — dấu hiệu băng cũ */
.tape-frame.on{animation:chromaShift 8s ease-in-out infinite;}
@keyframes chromaShift{
  0%,88%,100%{filter:saturate(1.18) contrast(1.08) brightness(.94);}
  91%{filter:saturate(1.5) contrast(1.2) brightness(.98) drop-shadow(2px 0 0 var(--vhs-magenta)) drop-shadow(-2px 0 0 var(--vhs-cyan));}
  94%{filter:saturate(1.18) contrast(1.08) brightness(.94) drop-shadow(-3px 0 0 var(--vhs-cyan));}
}
/* Ánh phosphor xanh của màn CRT */
.tv-screen::after{content:""; position:absolute; inset:0; pointer-events:none; z-index:2;
  box-shadow:inset 0 0 70px rgba(74,222,155,.09), inset 0 0 26px rgba(0,0,0,.7);}

/* 1. NÚT EJECT — LẬT SANG MẶT B CỦA BĂNG */
.btn-eject{background:#2A1F1F; border:1px solid #4A3535; color:#E88; }
.btn-eject:hover{background:#3A2828; color:#FAA;}
.tape-flip{perspective:1200px;}
.tape-label{transition:transform .9s cubic-bezier(.4,0,.2,1); transform-style:preserve-3d; position:relative;}
.tape-flip.flipped .tape-label{transform:rotateY(180deg);}
.label-side{backface-visibility:hidden;}
.label-side.back{position:absolute; inset:0; transform:rotateY(180deg); background:#DCD6C4;
  border-radius:4px; padding:20px 22px; overflow:auto;}
.side-tag{display:inline-block; font-family:'Courier New',monospace; font-size:9.5px; letter-spacing:.24em;
  background:#1A1E22; color:#E8E4D6; padding:3px 10px; margin-bottom:12px;}
.side-list{margin:0; padding:0; list-style:none;}
.side-list li{display:flex; justify-content:space-between; gap:12px; padding:7px 0;
  border-bottom:1px dashed #C4BEAC; font-size:12.5px; color:#2A2E32;}
.side-list li span:last-child{font-family:'Courier New',monospace; color:#6A7178;}

/* 2. BỘ ĐẾM BĂNG CƠ HỌC */
.tape-counter{display:flex; justify-content:center; gap:5px; margin-top:14px;}
.tc-digit{width:26px; height:36px; background:#0E1215; border:1px solid #2A3238; border-radius:3px;
  display:flex; align-items:center; justify-content:center; font-family:'Courier New',monospace;
  font-size:19px; color:var(--kyyeu-accent); box-shadow:inset 0 -6px 10px rgba(0,0,0,.5);
  position:relative; overflow:hidden;}
.tc-digit::after{content:""; position:absolute; left:0; right:0; top:50%; height:1px; background:rgba(0,0,0,.55);}

/* 3. THANH CHỈNH TRACKING BẰNG TAY */
.tracking-control{max-width:420px; margin:20px auto 0; text-align:center;}
.tracking-control label{display:block; font-family:'Courier New',monospace; font-size:10.5px;
  letter-spacing:.16em; color:#7A868E; margin-bottom:10px;}
#trackingSlider{width:100%; max-width:280px; accent-color:var(--kyyeu-accent);}
.tracking-readout{margin-top:8px; font-family:'Courier New',monospace; font-size:11px; color:var(--kyyeu-accent);}
.tv-screen.mistracked .tape-frame.on{
  filter:saturate(1.9) contrast(1.35) brightness(.86) drop-shadow(4px 0 0 var(--vhs-magenta)) drop-shadow(-4px 0 0 var(--vhs-cyan));
  transform:translateX(var(--mt,0)) skewX(var(--mts,0deg));}
.tv-screen.mistracked .tracking-bar{opacity:.9 !important; animation-duration:1.4s;}