:root{--bg:#f3f5f8;--surface:#fff;--surface2:#eef2f6;--text:#101828;--muted:#667085;--accent:#2563eb;--accent-dark:#1d4ed8;--accent-soft:#e8f0ff;--border:#e2e6ec;--danger:#dc2626;--success:#16a34a;--shadow:0 10px 30px rgba(16,24,40,.07);--shadow-lg:0 18px 50px rgba(16,24,40,.10)}
*{box-sizing:border-box}html,body{min-height:100%;background:var(--bg)}body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;-webkit-font-smoothing:antialiased}button,input{font:inherit}button{cursor:pointer;-webkit-tap-highlight-color:transparent}
.app-shell{width:100%;max-width:760px;margin:0 auto;padding:24px 16px 36px}.app-logo{display:flex;align-items:center;gap:11px;margin:0 0 22px}.app-logo .brand-mark{width:42px;height:42px;border-radius:13px;background:#101828;color:#fff;display:grid;place-items:center;font-weight:800;box-shadow:0 5px 14px rgba(16,24,40,.18)}.app-logo strong{font-size:17px}.app-logo small{margin-top:3px}
.hero{padding:24px;border-radius:26px;background:linear-gradient(145deg,#101828,#24324a);color:#fff;box-shadow:var(--shadow-lg);margin-bottom:18px}.hero h1{font-size:31px;line-height:1.06;letter-spacing:-.8px;margin:0 0 10px}.hero p{margin:0;color:#d0d5dd;line-height:1.48;font-size:15px}
.grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}.stat{background:var(--surface);border:1px solid var(--border);border-radius:18px;padding:15px;box-shadow:var(--shadow)}.stat b{font-size:25px}.stat span{display:block;color:var(--muted);font-size:12px;margin-top:3px}
.section-title{display:flex;align-items:center;justify-content:space-between;gap:10px;margin:24px 2px 11px}.section-title h2{font-size:18px;margin:0}.actions{display:grid;grid-template-columns:1fr 1fr;gap:9px;margin-top:15px}.btn{border:0;border-radius:14px;padding:12px 14px;min-height:46px;font-weight:750}.btn-primary{background:var(--accent);color:#fff}.btn-soft{background:var(--accent-soft);color:#174ea6}.btn-ghost{background:var(--surface2);color:var(--text)}
.mode-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}.mode-card{border:1px solid var(--border);background:var(--surface);color:var(--text);border-radius:20px;padding:17px;text-align:left;box-shadow:var(--shadow);min-height:128px}.mode-card .mode-icon{width:40px;height:40px;display:grid;place-items:center;border-radius:12px;background:var(--accent-soft);color:var(--accent);font-size:21px;margin-bottom:13px}.mode-card h3{font-size:15px;margin:0 0 5px}.mode-card p{margin:0;color:var(--muted);font-size:12px;line-height:1.4}
.notice{font-size:12px;line-height:1.5;color:var(--muted);background:var(--surface2);padding:13px 14px;border-radius:15px;margin-top:15px}.backline{margin-bottom:14px}.backline button{border:0;background:transparent;padding:5px 0;color:var(--accent);font-weight:750}
.category-grid{display:grid;grid-template-columns:1fr;gap:9px}.category-card{width:100%;border:1px solid var(--border);background:var(--surface);color:var(--text);border-radius:17px;padding:14px;text-align:left;display:flex;justify-content:space-between;align-items:center;box-shadow:var(--shadow);min-height:70px}.category-left{display:flex;align-items:center;min-width:0}.category-card .cat-icon{width:40px;height:40px;flex:0 0 40px;display:grid;place-items:center;border-radius:12px;background:var(--accent-soft);color:var(--accent);font-size:20px;margin-right:12px}.category-card strong{display:block;font-size:14px}.category-card small{display:block;color:var(--muted);font-size:11px;line-height:1.35;margin-top:3px}.chev{color:#98a2b3;font-size:23px;margin-left:8px}.mode-note{padding:13px 15px;background:var(--surface2);border-radius:15px;font-size:12px;line-height:1.45;color:var(--muted)}
.progress{height:8px;background:var(--surface2);border-radius:99px;overflow:hidden}.progress i{display:block;height:100%;background:var(--accent);border-radius:99px}.flash-wrap{perspective:1200px}.flashcard{display:block;width:100%;height:470px;position:relative;padding:0;border:0;background:transparent;transform-style:preserve-3d;transition:transform .45s}.flashcard.flipped{transform:rotateY(180deg)}.face{position:absolute;inset:0;backface-visibility:hidden;background:var(--surface);border:1px solid var(--border);border-radius:26px;box-shadow:var(--shadow-lg);padding:24px;display:flex;flex-direction:column;justify-content:center;text-align:left}.face.back{transform:rotateY(180deg);justify-content:flex-start;overflow:auto}.face .label{font-size:10px;text-transform:uppercase;letter-spacing:.09em;color:var(--muted);font-weight:800}.face h2{font-size:30px;line-height:1.05;letter-spacing:-.6px;margin:9px 0}.face p{color:var(--muted);line-height:1.45}.tap-hint{margin-top:auto;color:var(--muted);font-size:11px;text-align:center}.detail{display:grid;gap:9px;margin-top:10px}.detail section{background:var(--surface2);border-radius:15px;padding:13px}.detail h4{margin:0 0 7px;font-size:12px}.detail ul{margin:0;padding-left:17px}.detail li{margin:4px 0;line-height:1.38;font-size:12px}.flash-actions{display:grid;grid-template-columns:1fr 1.15fr 1fr;gap:8px;margin-top:10px}
.quiz-card{background:var(--surface);border:1px solid var(--border);border-radius:22px;box-shadow:var(--shadow);padding:19px}.quiz-card h2{font-size:20px;line-height:1.3;margin:9px 0 14px}.label{font-size:10px;text-transform:uppercase;letter-spacing:.09em;color:var(--muted);font-weight:800}.option{width:100%;display:block;text-align:left;background:var(--surface);color:var(--text);border:1px solid var(--border);padding:13px;border-radius:14px;margin-top:8px;line-height:1.4}.option:disabled{cursor:default}.option.correct{border-color:var(--success);background:#ecfdf3}.option.wrong{border-color:var(--danger);background:#fef2f2}.feedback{margin-top:11px;padding:12px;border-radius:14px;background:var(--surface2);font-size:12px;line-height:1.5}
.search{display:block;width:100%;border:1px solid var(--border);background:var(--surface);color:var(--text);border-radius:15px;padding:13px 14px;outline:none;margin-bottom:11px}.list{display:grid;gap:9px}.list-card{width:100%;background:var(--surface);border:1px solid var(--border);color:var(--text);border-radius:17px;padding:14px;display:flex;justify-content:space-between;gap:10px;align-items:center;text-align:left;box-shadow:var(--shadow)}.list-card h3{margin:0;font-size:14px}.list-card p{margin:5px 0 0;color:var(--muted);font-size:11px;line-height:1.35}.chip{border:1px solid var(--border);background:var(--surface);color:var(--text);padding:8px 11px;border-radius:99px}.chip.active{background:var(--text);color:#fff;border-color:var(--text)}
.settings-row{display:flex;align-items:center;justify-content:space-between;gap:12px;background:var(--surface);border:1px solid var(--border);padding:15px;border-radius:17px;box-shadow:var(--shadow)}.settings-row strong{font-size:14px}.settings-row small{font-size:11px}.toggle{width:48px;height:28px;border-radius:99px;border:0;background:var(--surface2);position:relative}.toggle i{position:absolute;width:22px;height:22px;top:3px;left:3px;border-radius:50%;background:#98a2b3;transition:.2s}.toggle.on{background:var(--accent)}.toggle.on i{left:23px;background:#fff}.empty{text-align:center;color:var(--muted);padding:28px}.toast{position:fixed;left:50%;bottom:24px;transform:translate(-50%,20px);opacity:0;pointer-events:none;background:#101828;color:#fff;padding:10px 14px;border-radius:12px;font-size:12px;transition:.2s;z-index:50}.toast.show{opacity:1;transform:translate(-50%,0)}
body.dark{--bg:#0b1220;--surface:#111a2a;--surface2:#172235;--text:#f8fafc;--muted:#98a2b3;--border:#26344a;--accent-soft:#172f55}body.dark .hero{background:linear-gradient(145deg,#111827,#1e293b)}body.dark .app-logo .brand-mark{background:#f8fafc;color:#101828}
@media(min-width:700px){.app-shell{padding-top:34px}.grid{grid-template-columns:repeat(4,1fr)}.category-grid{grid-template-columns:1fr 1fr}.flashcard{height:520px}}

/* v4 fixes */
body.dark .option.correct{background:#153b28;color:#f8fafc;border-color:#22c55e}
body.dark .option.wrong{background:#421b1b;color:#f8fafc;border-color:#ef4444}
body.dark .quiz-card{background:var(--surface);color:var(--text)}
body.dark .quiz-card .feedback{background:var(--surface2);color:var(--text)}
body.dark .quiz-card .option{background:var(--surface);color:var(--text)}
body.dark .quiz-card .option.correct{background:#153b28;color:#f8fafc}
body.dark .quiz-card .option.wrong{background:#421b1b;color:#f8fafc}
body.dark .quiz-card .btn-primary{color:#fff}

html.dark,body.dark{background:var(--bg)!important}

html.dark{background:#0b1220!important}html.dark body{background:#0b1220!important}

.progress-overview{display:block;width:100%;border:1px solid var(--border);background:var(--surface);color:var(--text);border-radius:18px;padding:15px;text-align:left;box-shadow:var(--shadow)}
.progress-overview-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:9px}.progress-overview small{display:block;color:var(--muted);font-size:11px;margin-top:7px}
.progress-med-list{display:grid;gap:10px}.progress-med{background:var(--surface);border:1px solid var(--border);border-radius:18px;padding:15px;box-shadow:var(--shadow)}
.progress-med-title{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px;font-size:14px}.progress-med-title span{color:var(--accent);font-weight:800;font-size:12px}
.progress-cats{display:grid;gap:8px;margin-top:13px}.progress-cat>div:first-child{display:flex;justify-content:space-between;gap:8px;font-size:11px;color:var(--muted);margin-bottom:4px}.progress-cat b{color:var(--text);font-size:10px}.progress-small{height:6px}