@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@300;400;700&display=swap');
* { box-sizing: border-box; margin: 0; padding: 0; -webkit-tap-highlight-color: transparent; }
html, body { height: 100%; }
body {
  background: #070d1a; color: #f1f5f9;
  font-family: 'Noto Sans SC', Georgia, sans-serif;
  overflow-x: hidden;
}
#app { max-width: 480px; margin: 0 auto; min-height: 100vh; display: flex; flex-direction: column; }
button { font-family: inherit; cursor: pointer; border: none; transition: background .15s, transform .1s; }
button:active { transform: scale(.96); }
input, textarea { font-family: inherit; outline: none; }
::-webkit-scrollbar { width: 4px; } ::-webkit-scrollbar-thumb { background: #1e3a5f; border-radius: 2px; }

.header { padding: 18px 18px 0; display: flex; justify-content: space-between; align-items: center; }
.title { font-size: 20px; font-weight: 700; letter-spacing: 1px; }
.subtitle { font-size: 11px; color: #475569; letter-spacing: 2px; }
.count { font-size: 22px; color: #fbbf24; font-weight: 300; text-align: right; }
.count-label { font-size: 10px; color: #475569; letter-spacing: 1px; text-align: right; }

.nav { display: flex; gap: 4px; padding: 14px 18px 0; }
.nav button { flex: 1; padding: 8px 0; border-radius: 10px; background: transparent; color: #475569; font-size: 12px; letter-spacing: 1px; text-transform: uppercase; font-weight: 700; }
.nav button.active { background: #1e3a5f; color: #7dd3fc; }

.body { flex: 1; padding: 18px; overflow-y: auto; position: relative; }
.col { display: flex; flex-direction: column; gap: 12px; }
.row { display: flex; align-items: center; gap: 12px; }
.card { background: rgba(255,255,255,.04); border: 1px solid rgba(255,255,255,.07); border-radius: 18px; padding: 16px; display: flex; align-items: center; gap: 12px; position: relative; transition: transform .2s cubic-bezier(.34,1.56,.64,1), background .2s, border-color .2s; }
.lesson-card:active { transform: scale(.98); background: rgba(255,255,255,.06); }
.btn { background: linear-gradient(135deg, rgba(30,58,95,.9), rgba(12,74,110,.7)); border: 1px solid rgba(125,211,252,.25); color: #7dd3fc; padding: 15px; border-radius: 16px; font-size: 14px; font-weight: 700; width: 100%; letter-spacing: .3px; }
.btn:active { transform: scale(.97); filter: brightness(1.15); }
.btn-sm { background: rgba(30,58,95,.8); border: 1px solid rgba(125,211,252,.2); color: #7dd3fc; padding: 9px 18px; border-radius: 50px; font-size: 12px; font-weight: 700; white-space: nowrap; }
.ghost { background: none; color: #94a3b8; padding: 6px 10px; border-radius: 10px; font-size: 14px; }
.ghost:active { background: rgba(255,255,255,.06); }
.input { background: rgba(255,255,255,.05); border: 1px solid rgba(255,255,255,.08); color: #e2e8f0; padding: 11px 14px; border-radius: 12px; font-size: 14px; width: 100%; transition: border-color .2s; }
.input:focus { border-color: rgba(125,211,252,.4); }
.center { display: flex; flex-direction: column; align-items: center; justify-content: center; min-height: 300px; gap: 16px; text-align: center; }

@keyframes jiggle { 0%{transform:rotate(-1.5deg)} 50%{transform:rotate(1.5deg)} 100%{transform:rotate(-1.5deg)} }
.jiggle { animation: jiggle .25s ease-in-out infinite; }
@keyframes fadeSlide { from{opacity:0;transform:translateY(8px)} to{opacity:1;transform:translateY(0)} }
.fade-in { animation: fadeSlide .3s ease both; }
.del-badge { position: absolute; top: -7px; right: -7px; width: 22px; height: 22px; border-radius: 50%; background: #ef4444; color: #fff; font-size: 14px; font-weight: 700; display: flex; align-items: center; justify-content: center; border: 2px solid #070d1a; z-index: 11; }

.loader { position: fixed; inset: 0; background: #070d1a; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 20px; z-index: 200; }
.spinner { width: 40px; height: 40px; border: 3px solid #1e3a5f; border-top-color: #7dd3fc; border-radius: 50%; animation: spin 1s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

.onboard-overlay { position: fixed; inset: 0; background: #070d1a; z-index: 150; display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 32px 28px; text-align: center; gap: 0; }
.onboard-dots { display: flex; gap: 6px; justify-content: center; margin-top: 28px; }
.onboard-dot { width: 6px; height: 6px; border-radius: 3px; background: #1e3a5f; transition: width .3s, background .3s; }
.onboard-dot.active { width: 20px; background: #7dd3fc; }
@keyframes milePop { 0%{transform:scale(.5);opacity:0} 60%{transform:scale(1.08)} 100%{transform:scale(1);opacity:1} }
@keyframes carveIn { 0%{transform:scale(.55) rotate(-6deg);opacity:0;filter:blur(6px)} 70%{filter:blur(0)} 100%{transform:scale(1) rotate(0);opacity:1} }
@keyframes wordReveal { from{opacity:0;transform:translateY(7px)} to{opacity:1;transform:translateY(0)} }
@keyframes fadeUp { from{opacity:0;transform:translateY(4px)} to{opacity:1;transform:translateY(0)} }
.milestone-overlay { position: fixed; inset: 0; background: #070d1a; z-index: 160; display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 40px 28px; text-align: center; gap: 20px; }
.milestone-ring { width: 140px; height: 140px; border-radius: 50%; border: 3px solid #7dd3fc; background: rgba(125,211,252,.08); display: flex; flex-direction: column; align-items: center; justify-content: center; animation: milePop .5s cubic-bezier(.34,1.56,.64,1) both; }

.tag-chip { display: inline-flex; align-items: center; padding: 4px 12px; border-radius: 50px; font-size: 12px; font-weight: 700; letter-spacing: .3px; cursor: pointer; transition: background .15s, border-color .15s; border: 1px solid rgba(125,211,252,.2); background: rgba(30,58,95,.6); color: #7dd3fc; }
.tag-chip.selected { background: #1e3a5f; border-color: #7dd3fc; }
.tag-chip.lesson-tag { font-size: 11px; padding: 2px 8px; margin-left: 4px; }