:root{--bg:#0f1226;--fg:#eef0ff;--accent:#ff7a59;--accent2:#6ea8ff;--panel:rgba(255,255,255,.07)}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);font-family:system-ui,"Hiragino Sans","Yu Gothic",sans-serif;min-height:100vh;display:flex;flex-direction:column}
#bg{position:fixed;inset:0;width:100%;height:100%;z-index:-1}
.hero{text-align:center;padding:48px 16px 16px}
.hero h1{font-size:clamp(2rem,7vw,3.8rem);margin:0}
.hero h1 span{display:inline-block;animation:rise .8s both;background:linear-gradient(90deg,var(--accent),var(--accent2));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero h1 span+span{animation-delay:.2s}
.hero p{opacity:.8;animation:rise .8s .4s both}
@keyframes rise{from{opacity:0;transform:translateY(24px)}to{opacity:1;transform:none}}
.tabs{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin-top:20px}
button{font:inherit;cursor:pointer;border:0;border-radius:999px;padding:8px 18px;background:var(--panel);color:var(--fg);transition:.2s}
button:hover{background:rgba(255,255,255,.18);transform:translateY(-2px)}
.tabs button[aria-selected=true]{background:linear-gradient(90deg,var(--accent),var(--accent2));color:#111;font-weight:700}
main{flex:1;width:min(900px,100% - 32px);margin:24px auto}
.panel{display:none;background:var(--panel);backdrop-filter:blur(8px);border-radius:20px;padding:24px;text-align:center}
.panel.active{display:block;animation:rise .5s both}
.hint{opacity:.7}
/* clock */
.clock{position:relative;width:240px;height:240px;margin:16px auto;border-radius:50%;border:4px solid var(--accent2);box-shadow:0 0 30px rgba(110,168,255,.4)}
.hand{position:absolute;left:50%;bottom:50%;transform-origin:bottom center;border-radius:4px;background:var(--fg)}
.h{width:6px;height:60px;margin-left:-3px}
.m{width:4px;height:85px;margin-left:-2px}
.s{width:2px;height:100px;margin-left:-1px;background:var(--accent)}
.dot{position:absolute;left:50%;top:50%;width:14px;height:14px;margin:-7px;border-radius:50%;background:var(--accent)}
.digital{font-size:2rem;font-variant-numeric:tabular-nums;letter-spacing:.1em}
/* cards */
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:16px}
.card{height:150px;perspective:800px;cursor:pointer;position:relative}
.face{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;border-radius:16px;font-size:2rem;backface-visibility:hidden;transition:transform .6s}
.front{background:linear-gradient(135deg,#3b4fd8,#8f5cf6)}
.front b{font-size:1.1rem}
.back{background:linear-gradient(135deg,var(--accent),#ffb347);color:#111;font-size:1rem;padding:12px;transform:rotateY(180deg)}
.card.flip .front{transform:rotateY(180deg)}
.card.flip .back{transform:rotateY(360deg)}
/* todo */
#todoForm{display:flex;gap:8px;justify-content:center}
input{font:inherit;padding:8px 14px;border-radius:999px;border:0;min-width:0;flex:1;max-width:360px}
ul{list-style:none;padding:0;max-width:440px;margin:16px auto}
li{display:flex;justify-content:space-between;align-items:center;gap:8px;background:rgba(255,255,255,.1);padding:10px 14px;border-radius:12px;margin-bottom:8px;animation:rise .3s both;cursor:pointer}
li.done span{text-decoration:line-through;opacity:.5}
li button{padding:2px 10px}
/* game */
#arena{position:relative;height:280px;border-radius:16px;background:rgba(0,0,0,.3);overflow:hidden;margin-top:12px}
#target{position:absolute;width:48px;height:48px;border-radius:50%;background:radial-gradient(circle,#fff,var(--accent));cursor:pointer;display:none;transition:left .15s,top .15s;animation:pulse .6s infinite alternate}
@keyframes pulse{to{transform:scale(1.2)}}
footer{text-align:center;padding:20px;opacity:.5;font-size:.85rem}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}