:root{--bg: #0b0f1a;--bg2: #121829;--card: #161d31;--card2: #1b2540;--text: #eef2ff;--muted: #8b97b8;--accent: #6366f1;--line: #232c45;--good: #22c55e;--bad: #ef4444;--safe-bottom: env(safe-area-inset-bottom, 0px);--safe-top: env(safe-area-inset-top, 0px)}*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}html,body,#root{height:100%;margin:0}body{background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;overscroll-behavior-y:none}button{font-family:inherit;cursor:pointer}.splash{display:grid;place-items:center;height:100%;color:var(--muted)}.app{display:flex;flex-direction:column;height:100%;max-width:560px;margin:0 auto}.screen{flex:1;overflow-y:auto;-webkit-overflow-scrolling:touch}.pad{padding:calc(16px + var(--safe-top)) 16px 96px}.home-head{margin:8px 0 16px}.home-head h1{font-size:30px;margin:4px 0 0;letter-spacing:-.5px}.hello{color:var(--muted);font-size:14px}.section-title{font-size:15px;color:var(--muted);text-transform:uppercase;letter-spacing:1px;margin:26px 0 12px}.stat-row{display:flex;gap:10px}.chip{flex:1;background:var(--card);border:1px solid var(--line);border-radius:16px;padding:12px;display:flex;flex-direction:column;gap:2px}.chip .big{font-size:20px;font-weight:700}.chip span:not(.big){font-size:12px;color:var(--muted)}.chip.goal{position:relative}.goalbar{height:5px;background:var(--bg2);border-radius:99px;margin-top:8px;overflow:hidden}.goalbar>div{height:100%;background:linear-gradient(90deg,#6366f1,#8b5cf6);transition:width .3s}.grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.tile{position:relative;text-align:left;color:var(--text);background:var(--card);border:1px solid var(--line);border-radius:20px;padding:16px;min-height:120px;display:flex;flex-direction:column;gap:6px;overflow:hidden;transition:transform .08s}.tile:active{transform:scale(.97)}.tile:before{content:"";position:absolute;top:0;right:0;bottom:0;left:0;opacity:.16;background:radial-gradient(circle at 80% 0%,var(--accent),transparent 60%)}.tile-emoji{font-size:30px}.tile-name{font-weight:700;font-size:17px}.tile-meta{margin-top:auto;display:flex;justify-content:space-between;align-items:center;font-size:12px;color:var(--muted)}.due-dot{background:var(--accent);color:#fff;padding:2px 8px;border-radius:99px;font-weight:600}.topbar{display:flex;align-items:center;gap:8px;margin-bottom:8px}.topbar-title{font-weight:700;font-size:18px;flex:1;text-align:center}.topbar-right{min-width:52px;text-align:right}.link{background:none;border:none;color:var(--accent);font-size:15px;padding:6px}.link.danger{color:var(--bad)}.btn{border:none;border-radius:14px;padding:12px 16px;font-size:15px;font-weight:600}.btn.primary{background:linear-gradient(90deg,#6366f1,#8b5cf6);color:#fff}.btn.ghost{background:var(--card);color:var(--text);border:1px solid var(--line)}.btn.full{width:100%}.btn.small{padding:8px 12px;font-size:13px}.btn:disabled{opacity:.45}.cta-row{display:flex;gap:10px;margin:14px 0}.big-btn{flex:1}.card-list{display:flex;flex-direction:column;gap:10px}.row-card{text-align:left;color:var(--text);background:var(--card);border:1px solid var(--line);border-radius:16px;padding:14px}.row-q{font-weight:600;font-size:16px}.row-sum{color:var(--muted);font-size:14px;margin-top:4px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.row-foot{display:flex;align-items:center;gap:10px;margin-top:10px}.mini-bar{flex:1;height:5px;background:var(--bg2);border-radius:99px;overflow:hidden}.mini-bar i{display:block;height:100%;background:var(--good)}.muted{color:var(--muted);font-size:13px}.detail .label{font-size:12px;letter-spacing:1px;text-transform:uppercase;color:var(--muted);margin:18px 0 6px}.detail .q{font-size:22px;margin:0;line-height:1.3}.summary-box{background:var(--card);border:1px solid var(--line);border-left:3px solid var(--accent);border-radius:12px;padding:14px;font-size:16px;line-height:1.5}.deepdive{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:4px 16px;margin-top:12px}.deepdive.small{font-size:14px}.full{width:100%}.md h2,.md h3,.md h4,.md h5{margin:16px 0 8px;line-height:1.25}.md h2{font-size:19px}.md h3{font-size:17px}.md h4{font-size:15px;color:var(--accent)}.md p{line-height:1.6}.md ul,.md ol{padding-left:20px}.md li{margin:5px 0;line-height:1.5}.md code{background:var(--bg2);padding:2px 6px;border-radius:6px;font-size:.9em}.md blockquote{border-left:3px solid var(--accent);margin:10px 0;padding:4px 12px;color:var(--muted)}.md strong{color:#fff}.study{display:flex;flex-direction:column;height:100%;padding:calc(12px + var(--safe-top)) 16px calc(16px + var(--safe-bottom))}.study-top{display:flex;align-items:center;gap:12px}.progress{flex:1;height:6px;background:var(--bg2);border-radius:99px;overflow:hidden}.progress i{display:block;height:100%;background:linear-gradient(90deg,#6366f1,#8b5cf6);transition:width .3s}.count{color:var(--muted);font-size:13px;font-variant-numeric:tabular-nums}.flashcard{flex:1;margin:16px 0;border-radius:24px;background:var(--card2);border:1px solid var(--line);padding:24px;overflow-y:auto;display:flex;box-shadow:0 10px 40px #00000059}.face{width:100%;display:flex;flex-direction:column}.face-label{font-size:12px;letter-spacing:2px;color:var(--muted)}.face-q{font-size:26px;font-weight:700;line-height:1.3;margin:auto 0;text-align:center}.face-a{font-size:20px;line-height:1.5;margin:18px 0}.front{align-items:center;justify-content:center}.front .face-q{margin:20px 0}.tap-hint{color:var(--muted);font-size:13px;margin-top:auto}.back{align-items:stretch}.rate-row{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}.rate{border:none;border-radius:14px;padding:16px 6px;font-weight:700;font-size:14px;color:#fff}.rate.again{background:#ef4444}.rate.hard{background:#f59e0b}.rate.good{background:#22c55e}.rate.easy{background:#3b82f6}.center-screen{display:grid;place-items:center;min-height:70vh}.finish{text-align:center}.finish-emoji{font-size:64px}.field{display:flex;flex-direction:column;gap:6px;margin:14px 0}.field>span{font-size:13px;color:var(--muted);font-weight:600}.field input,.field select,.field textarea,.add-sub input{background:var(--card);border:1px solid var(--line);color:var(--text);border-radius:12px;padding:12px;font-size:16px;width:100%;resize:vertical}.field textarea{line-height:1.4}.field-row{display:flex;gap:10px}.field-row .field{flex:1}.card-form{background:var(--bg2);border:1px solid var(--line);border-radius:16px;padding:12px;margin:8px 0 16px}.banner{background:#6366f126;border:1px solid var(--accent);border-radius:12px;padding:12px;font-size:14px;margin-bottom:12px}.error{background:#ef44441f;border:1px solid var(--bad);color:#fecaca;border-radius:12px;padding:12px;margin-top:12px;font-size:14px}.empty{color:var(--muted);text-align:center;padding:40px 20px}.prev-card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:14px;margin-bottom:12px}.prev-card .label{font-size:11px;color:var(--muted);letter-spacing:1px;margin-top:10px}.prev-card .q{font-weight:600;font-size:16px}.prev-card details summary{color:var(--accent);margin-top:10px;cursor:pointer}.sub-manage{display:flex;flex-direction:column;gap:8px}.sub-item{display:flex;justify-content:space-between;align-items:center;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:10px 14px}.add-sub{display:flex;gap:8px}.add-sub input{flex:1}.file-btn{display:inline-flex;align-items:center}.foot-note{text-align:center;margin-top:30px}.bottomnav{display:flex;border-top:1px solid var(--line);background:#0b0f1aeb;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);padding-bottom:var(--safe-bottom)}.nav-btn{flex:1;background:none;border:none;color:var(--muted);padding:10px 0 8px;display:flex;flex-direction:column;align-items:center;gap:2px;font-size:11px}.nav-btn.active{color:var(--text)}.nav-icon{font-size:22px}