:root { --green: #58cc02; --green-dk: #46a302; --accent: #1cb0f6; --red: #ff4b4b; --red-dk: #ea2b2b; --grey: #e5e5e5; --txt: #3c3c3c; --sub: #777; }
* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body { margin: 0; }
body { font-family: -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; color: var(--txt); background: #fff; }
button { font-family: inherit; color: inherit; }

#app { max-width: 480px; margin: 0 auto; padding: 16px 16px 120px; }
h1 { font-size: 26px; text-align: center; }
h2 { font-size: 18px; }
.logo { font-size: 34px; margin: 24px 0 4px; }
.tag { text-align: center; color: var(--sub); margin: 4px 0 16px; }
.hint { text-align: center; color: var(--sub); margin: 4px 0 12px; }

/* header */
#hdr { position: sticky; top: 0; z-index: 10; display: flex; align-items: center; justify-content: space-between; gap: 10px; max-width: 480px; margin: 0 auto; padding: 10px 16px; background: #fff; border-bottom: 2px solid var(--grey); }
#hdr button { background: none; border: none; font-size: 28px; cursor: pointer; padding: 2px; }
#hStreak, #hHearts { font-size: 17px; font-weight: 800; }
#hRing { width: 34px; height: 34px; transform: rotate(-90deg); }
#hRing circle { fill: none; stroke-width: 4; }
#hRing .ringbg { stroke: var(--grey); }
#ringFill { stroke: var(--green); stroke-linecap: round; stroke-dasharray: 100; stroke-dashoffset: 100; transition: stroke-dashoffset .5s; }
#hRing text { font-size: 13px; transform: rotate(90deg); transform-origin: 18px 18px; }

/* buttons */
.btn { display: block; width: 100%; margin: 10px 0; padding: 14px; border: none; border-radius: 16px; background: var(--green); color: #fff; font-size: 18px; font-weight: 800; letter-spacing: .5px; box-shadow: 0 4px 0 var(--green-dk); cursor: pointer; transition: transform .05s; }
.btn:active { transform: translateY(3px); box-shadow: 0 1px 0 var(--green-dk); }
.btn:disabled { background: var(--grey); box-shadow: 0 4px 0 #cfcfcf; color: #aaa; }
.btn.red { background: var(--red); box-shadow: 0 4px 0 var(--red-dk); }
.btn.ghost { background: #fff; color: var(--accent); box-shadow: 0 4px 0 var(--grey); border: 2px solid var(--grey); }

/* profile picker */
.cards { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 16px 0; }
.card { display: flex; flex-direction: column; align-items: center; gap: 4px; padding: 18px 10px; border: 2px solid var(--grey); border-radius: 20px; background: #fff; font-size: 16px; cursor: pointer; box-shadow: 0 4px 0 var(--grey); }
.card:active { transform: translateY(3px); box-shadow: none; }
.card .cav { font-size: 44px; }
.card small { color: var(--sub); }
.card.add { border-style: dashed; color: var(--sub); }
.lb { list-style: none; margin: 0; padding: 0; }
.lb li { display: flex; justify-content: space-between; align-items: center; padding: 10px 14px; border: 2px solid var(--grey); border-radius: 14px; margin-bottom: 8px; font-size: 16px; }
.gear { position: fixed; top: 12px; right: 14px; background: none; border: none; font-size: 24px; cursor: pointer; }
.avgrid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin: 12px 0 20px; }
.av { font-size: 34px; padding: 10px 0; background: #fff; border: 2px solid var(--grey); border-radius: 16px; cursor: pointer; }
.av.sel { border-color: var(--green); background: #d7ffb8; }

/* dashboard */
.courses { display: flex; gap: 10px; margin-bottom: 18px; }
.chip { font-size: 26px; padding: 6px 14px; border: 2px solid var(--grey); border-radius: 14px; background: #fff; cursor: pointer; opacity: .55; }
.chip.active { border-color: var(--accent); opacity: 1; box-shadow: 0 3px 0 var(--accent); }
.unit { border: 2px solid var(--grey); border-radius: 20px; padding: 14px; margin-bottom: 18px; }
.unit.lockedu { opacity: .45; }
.unithead { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.unithead .uicon { font-size: 36px; }
.unithead small { display: block; color: var(--sub); }
.unithead .crown { margin-left: auto; font-size: 30px; }
.bubbles { display: flex; justify-content: space-between; gap: 6px; }
.bub { width: 54px; height: 54px; border-radius: 50%; border: none; font-size: 19px; font-weight: 800; color: #fff; background: var(--accent); box-shadow: 0 4px 0 rgba(0,0,0,.25); cursor: pointer; }
.bub:active:not(:disabled) { transform: translateY(3px); box-shadow: none; }
.bub.done { background: var(--green); box-shadow: 0 4px 0 var(--green-dk); }
.bub.test { background: #ffd900; box-shadow: 0 4px 0 #d4b500; }
.bub.locked { background: var(--grey); box-shadow: 0 4px 0 #cfcfcf; cursor: default; }

/* lesson */
.lessontop { display: flex; align-items: center; gap: 12px; margin-bottom: 20px; }
.lessontop #quit { background: none; border: none; font-size: 22px; color: var(--sub); cursor: pointer; }
.pbar { flex: 1; height: 14px; background: var(--grey); border-radius: 7px; overflow: hidden; }
.pfill { height: 100%; background: var(--green); border-radius: 7px; transition: width .4s; }
.lhearts { font-weight: 800; }
.prompt { font-size: 17px; font-weight: 800; color: var(--sub); }
.bigemoji { font-size: 74px; text-align: center; margin: 8px 0; }
.qword { font-size: 24px; text-align: center; margin: 8px 0 20px; }
.hole { color: var(--accent); font-weight: 900; letter-spacing: 2px; }
.sbtn { background: var(--accent); border: none; border-radius: 12px; font-size: 18px; padding: 6px 10px; cursor: pointer; box-shadow: 0 3px 0 rgba(0,0,0,.2); margin: 0 2px; }
.sbtn:active { transform: translateY(2px); box-shadow: none; }
.bigspk { text-align: center; margin: 20px 0; }
.bigspk .sbtn { font-size: 34px; padding: 14px 20px; }
.notice { text-align: center; color: var(--sub); background: #fff7d6; border-radius: 12px; padding: 10px; }

.opts { display: grid; gap: 10px; margin-top: 10px; }
.opts button { padding: 14px; font-size: 18px; background: #fff; border: 2px solid var(--grey); border-radius: 14px; box-shadow: 0 3px 0 var(--grey); cursor: pointer; }
.opts button:active:not(:disabled) { transform: translateY(2px); box-shadow: none; }
.opts button.right { border-color: var(--green); background: #d7ffb8; animation: pop .3s; }
.opts button.wrongo { border-color: var(--red); background: #ffdfe0; animation: shake .4s; }

.tilerow { min-height: 52px; border-bottom: 2px solid var(--grey); border-top: 2px solid var(--grey); padding: 8px 2px; display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; }
.tiles { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }
.tile { padding: 10px 14px; font-size: 17px; background: #fff; border: 2px solid var(--grey); border-radius: 12px; box-shadow: 0 3px 0 var(--grey); cursor: pointer; animation: pop .2s; }
.tile.used { visibility: hidden; }
.tile:active { transform: translateY(2px); box-shadow: none; }

.typein { display: block; width: 100%; margin: 14px 0; padding: 14px; font-size: 18px; border: 2px solid var(--grey); border-radius: 14px; outline: none; }
.typein:focus { border-color: var(--accent); }

.matchgrid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 10px; }
.mbtn { padding: 16px 8px; font-size: 17px; background: #fff; border: 2px solid var(--grey); border-radius: 14px; box-shadow: 0 3px 0 var(--grey); cursor: pointer; }
.mbtn.sel { border-color: var(--accent); background: #e3f5ff; }
.mbtn.off { opacity: .35; border-color: var(--green); }

.micbtn { display: block; margin: 18px auto; width: 92px; height: 92px; border-radius: 50%; border: none; font-size: 40px; background: var(--accent); box-shadow: 0 5px 0 rgba(0,0,0,.25); cursor: pointer; }
.micbtn.rec { animation: pulse 1s infinite; background: var(--red); }

.checkrow { margin-top: 8px; }

/* feedback banner */
.banner { position: fixed; left: 0; right: 0; bottom: 0; z-index: 20; padding: 18px 16px 22px; animation: slideup .25s; }
.banner > * { max-width: 480px; margin-left: auto; margin-right: auto; }
.banner b { display: block; font-size: 20px; margin-bottom: 4px; }
.banner.ok { background: #d7ffb8; color: #58a700; }
.banner.bad { background: #ffdfe0; color: var(--red-dk); }
.banner .correction { font-size: 18px; margin: 4px 0; }
.banner .xpline { font-weight: 800; margin: 4px 0 8px; }
.banner.ok .btn { background: var(--green); }

/* results */
.results { text-align: center; padding-top: 30px; }
.resxp { font-size: 44px; font-weight: 900; color: var(--green); margin: 10px 0; }
.badgelist { margin: 18px 0; }
.badge { display: flex; align-items: center; gap: 14px; text-align: left; border: 2px solid #ffd900; background: #fffbe6; border-radius: 16px; padding: 12px; margin-bottom: 10px; animation: pop .4s; }
.badge span { font-size: 40px; }
.badge small { display: block; color: var(--sub); }

/* modal / overlay */
#overlay { position: fixed; inset: 0; z-index: 30; background: rgba(0,0,0,.45); display: flex; align-items: center; justify-content: center; padding: 20px; }
.modal { background: #fff; border-radius: 20px; padding: 20px; width: 100%; max-width: 420px; max-height: 85vh; overflow: auto; }
.mtext { font-size: 16px; }
.modal textarea { width: 100%; height: 140px; font-size: 12px; border: 2px solid var(--grey); border-radius: 12px; padding: 8px; margin-bottom: 10px; }
.celebrate { text-align: center; }
.celebrate .flame { font-size: 90px; animation: pulse 1s infinite; }

/* confetti */
.cf { position: fixed; top: -14px; width: 10px; height: 14px; border-radius: 3px; z-index: 40; pointer-events: none; animation: fall linear forwards; }

/* animations */
@keyframes fall { to { transform: translateY(105vh) rotate(720deg); } }
@keyframes pop { 0% { transform: scale(.7); } 60% { transform: scale(1.08); } 100% { transform: scale(1); } }
@keyframes shake { 0%,100% { transform: translateX(0); } 25% { transform: translateX(-7px); } 75% { transform: translateX(7px); } }
@keyframes slideup { from { transform: translateY(100%); } to { transform: translateY(0); } }
@keyframes pulse { 0%,100% { transform: scale(1); } 50% { transform: scale(1.12); } }