:root{
  --bg1:#f4f1ea;--bg2:#e6edf7;--ink:#1f2430;--mute:#5d6577;--card:rgba(255,255,255,.72);--line:rgba(30,40,70,.12);
  --accent:#d9692b;--accent2:#3b6fd4;--shadow:0 10px 30px rgba(30,40,80,.12);
  --t0:#cdc1b4;--t1:#eee4da;--t2:#ede0c8;--t3:#f2b179;--t4:#f59563;--t5:#f67c5f;--t6:#f65e3b;--t7:#edcf72;--t8:#edcc61;--t9:#edc850;--t10:#edc53f;--t11:#edc22e;
  color-scheme:light;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --bg1:#12151f;--bg2:#1b2236;--ink:#e8ebf4;--mute:#9aa3b8;--card:rgba(32,38,58,.72);--line:rgba(255,255,255,.1);
  --accent:#ff8a4c;--accent2:#7ea6ff;--shadow:0 10px 30px rgba(0,0,0,.4);color-scheme:dark}}
:root[data-theme="dark"]{--bg1:#12151f;--bg2:#1b2236;--ink:#e8ebf4;--mute:#9aa3b8;--card:rgba(32,38,58,.72);--line:rgba(255,255,255,.1);
  --accent:#ff8a4c;--accent2:#7ea6ff;--shadow:0 10px 30px rgba(0,0,0,.4);color-scheme:dark}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;min-height:100vh;color:var(--ink);font:17px/1.6 system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  background:linear-gradient(135deg,var(--bg1),var(--bg2));background-attachment:fixed;display:flex;flex-direction:column}
body::before{content:"";position:fixed;inset:-20%;z-index:-1;pointer-events:none;
  background:radial-gradient(40% 35% at 20% 25%,color-mix(in srgb,var(--accent) 22%,transparent),transparent 70%),
             radial-gradient(35% 30% at 80% 70%,color-mix(in srgb,var(--accent2) 24%,transparent),transparent 70%);
  animation:drift 28s ease-in-out infinite alternate}
@keyframes drift{from{transform:translate3d(-2%,-1%,0) scale(1)}to{transform:translate3d(3%,2%,0) scale(1.08)}}
header.top{display:flex;align-items:center;gap:1rem;flex-wrap:wrap;padding:1rem clamp(1rem,4vw,2.5rem)}
.brand{font-weight:700;font-size:1.25rem;letter-spacing:.2px;color:var(--ink);text-decoration:none;display:flex;align-items:center;gap:.5rem}
.brand svg{width:28px;height:28px}
nav{margin-left:auto;display:flex;gap:.25rem;flex-wrap:wrap;align-items:center}
nav a,nav button{color:var(--mute);text-decoration:none;padding:.4rem .8rem;border-radius:999px;border:0;background:none;font:inherit;cursor:pointer;transition:.2s}
#themeBtn{font-size:1.15rem;line-height:1}
nav a:hover,nav button:hover,nav a[aria-current="page"]{color:var(--ink);background:var(--card);box-shadow:inset 0 0 0 1px var(--line)}
main{flex:1;width:min(1000px,100%);margin:0 auto;padding:1rem clamp(1rem,4vw,2.5rem) 3rem}
h1{font-size:clamp(1.8rem,5vw,2.8rem);line-height:1.15;margin:.5rem 0 1rem}
h2{font-size:1.35rem;margin:2rem 0 .8rem}
.lead{color:var(--mute);max-width:60ch}
.card{background:var(--card);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow);padding:1.4rem}
.grid{display:grid;gap:1rem;grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.tile-link{display:block;text-decoration:none;color:inherit;transition:transform .25s,box-shadow .25s}
.tile-link:hover{transform:translateY(-4px)}
.tile-link h3{margin:.2rem 0 .3rem;font-size:1.15rem}
.tile-link p{margin:0;color:var(--mute);font-size:.95rem}
.emoji{font-size:2rem}
.quote-box{position:relative;overflow:hidden;padding:clamp(1.4rem,4vw,2.6rem)}
.quote-box{padding-top:clamp(3.4rem,8vw,4.2rem)}
.quote-box::before{content:"«";position:absolute;top:.4rem;left:1.1rem;font-size:5.5rem;line-height:1;color:var(--accent);opacity:.3;font-family:Georgia,serif}
.quote-text{font-size:clamp(1.25rem,3.4vw,1.9rem);line-height:1.4;margin:0;font-family:Georgia,"Times New Roman",serif;position:relative}
.quote-author{margin:1rem 0 0;color:var(--accent);font-weight:600;position:relative}
.fade-in{animation:fadein .7s ease both}
@keyframes fadein{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}
.btn{text-decoration:none;display:inline-flex;align-items:center;gap:.4rem;padding:.6rem 1.1rem;border-radius:12px;border:0;cursor:pointer;font:inherit;font-weight:600;
  color:#fff;background:linear-gradient(135deg,var(--accent),color-mix(in srgb,var(--accent) 60%,var(--accent2)));box-shadow:0 6px 16px color-mix(in srgb,var(--accent) 40%,transparent);transition:.2s}
.btn:hover{transform:translateY(-2px);filter:brightness(1.06)}
.btn:active{transform:translateY(0) scale(.98)}
.btn.ghost{background:var(--card);color:var(--ink);box-shadow:inset 0 0 0 1px var(--line)}
.row{display:flex;gap:.7rem;flex-wrap:wrap;align-items:center}
input[type=search],input[type=text]{font:inherit;padding:.6rem .9rem;border-radius:12px;border:1px solid var(--line);background:var(--card);color:var(--ink);min-width:220px;flex:1}
.q-item{margin:0 0 .8rem;opacity:0;animation:fadein .5s ease forwards}
.q-item p{margin:0;font-family:Georgia,"Times New Roman",serif;font-size:1.1rem}
.q-item small{color:var(--accent);font-weight:600}
.tabs{display:flex;gap:.4rem;flex-wrap:wrap;margin:0 0 1rem}
.tabs button{padding:.55rem 1rem;border-radius:999px;border:1px solid var(--line);background:var(--card);color:var(--mute);font:inherit;cursor:pointer;transition:.2s}
.tabs button[aria-selected="true"]{color:#fff;background:linear-gradient(135deg,var(--accent),var(--accent2));border-color:transparent;box-shadow:var(--shadow)}
.game{display:none}.game.active{display:block;animation:fadein .4s ease}
.stats{display:flex;gap:.6rem;flex-wrap:wrap;margin:.4rem 0 1rem}
.stat{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:.4rem .9rem;min-width:96px;text-align:center}
.stat b{display:block;font-size:1.25rem}.stat span{font-size:.75rem;color:var(--mute);text-transform:uppercase;letter-spacing:.05em}
.hint{color:var(--mute);font-size:.92rem;margin:.6rem 0 0}
/* 2048 */
#b2048{position:relative;width:min(420px,100%);aspect-ratio:1;border-radius:18px;padding:0;background:color-mix(in srgb,var(--ink) 16%,transparent);touch-action:none;user-select:none;margin:0 auto}
#b2048 .bg,#b2048 .t{position:absolute;width:25%;height:25%;padding:6px}
#b2048 .bg i{display:block;width:100%;height:100%;border-radius:12px;background:color-mix(in srgb,var(--ink) 10%,transparent)}
#b2048 .t{transition:left .14s ease,top .14s ease;z-index:2}
#b2048 .t b{display:flex;width:100%;height:100%;align-items:center;justify-content:center;border-radius:12px;font-size:clamp(1.3rem,6.4vw,2.1rem);font-weight:800;color:#6a5b4b;box-shadow:0 3px 8px rgba(0,0,0,.18)}
#b2048 .t.new b{animation:pop .2s .12s both}
#b2048 .t.merge b{animation:bump .2s .12s}
@keyframes pop{from{transform:scale(0)}to{transform:scale(1)}}
@keyframes bump{50%{transform:scale(1.18)}}
.overlay{position:absolute;inset:0;z-index:5;display:none;flex-direction:column;align-items:center;justify-content:center;gap:.8rem;border-radius:18px;
  background:color-mix(in srgb,var(--bg1) 78%,transparent);backdrop-filter:blur(4px);text-align:center}
.overlay.show{display:flex;animation:fadein .35s}
.overlay h3{font-size:1.8rem;margin:0}
/* memory */
#mem{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;width:min(440px,100%);margin:0 auto;position:relative}
.mc{aspect-ratio:1;perspective:600px;border:0;padding:0;background:none;cursor:pointer}
.mc .in{display:block;position:relative;width:100%;height:100%;transition:transform .45s cubic-bezier(.3,.7,.3,1);transform-style:preserve-3d}
.mc.open .in,.mc.done .in{transform:rotateY(180deg)}
.mc .f,.mc .b{position:absolute;inset:0;border-radius:14px;display:flex;align-items:center;justify-content:center;backface-visibility:hidden;-webkit-backface-visibility:hidden;box-shadow:0 4px 12px rgba(0,0,0,.18)}
.mc .f{background:linear-gradient(135deg,var(--accent),var(--accent2));color:#fff;font-size:1.6rem;font-weight:800}
.mc .f::after{content:"?";opacity:.85}
.mc .b{background:var(--card);border:1px solid var(--line);transform:rotateY(180deg);font-size:clamp(1.8rem,8vw,2.6rem)}
.mc.done .b{box-shadow:0 0 0 3px color-mix(in srgb,var(--accent) 70%,transparent),0 0 24px color-mix(in srgb,var(--accent) 55%,transparent)}
.mc.shake .in{animation:shake .35s}
@keyframes shake{25%{transform:rotateY(180deg) translateX(-6px)}75%{transform:rotateY(180deg) translateX(6px)}}
/* snake */
#snakeWrap{position:relative;width:min(440px,100%);margin:0 auto}
#snake{display:block;width:100%;aspect-ratio:1;border-radius:18px;background:color-mix(in srgb,var(--ink) 12%,transparent);touch-action:none;box-shadow:var(--shadow)}
#confetti{position:fixed;inset:0;pointer-events:none;z-index:50}
footer{padding:1.4rem clamp(1rem,4vw,2.5rem);color:var(--mute);font-size:.9rem;text-align:center}
footer a{color:var(--mute)}
.center{text-align:center}
.nf{margin-top:12vh;text-align:center}
.nf .big{font-size:clamp(4rem,18vw,9rem);font-weight:800;line-height:1;background:linear-gradient(135deg,var(--accent),var(--accent2));-webkit-background-clip:text;background-clip:text;color:transparent}
@media (prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important}}