:root{
  --bg:#0f1220;
  --card:#1a1e33;
  --card-2:#20264a;
  --text:#f1f2f6;
  --text-dim:#9aa0b4;
  --accent:#6c8cff;
  --good:#3ddc97;
  --bad:#ff5d7a;
  --bronze:#a9744f;
  --silver:#a7adb8;
  --gold:#e8c04c;
  --platinum:#4fd1c5;
  --diamond:#63b3ed;
  --master:#c084fc;
  --radius:18px;
  --tier-color:var(--accent);
  --grade-accent:var(--accent);
}

*{box-sizing:border-box;}
html,body{margin:0;padding:0;}
body{
  background:radial-gradient(1200px 800px at 50% -10%, #232a55 0%, var(--bg) 60%);
  color:var(--text);
  font-family:'Pretendard','Apple SD Gothic Neo','Malgun Gothic',sans-serif;
  min-height:100vh;
}

#app{
  max-width:480px;
  margin:0 auto;
  padding:0 20px 60px;
  min-height:100vh;
}

.topbar{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:18px 0;
}
.topbar-actions{display:flex;align-items:center;gap:12px;}
.brand{font-weight:800;font-size:18px;letter-spacing:-0.3px;display:flex;align-items:center;gap:6px;}
.brand-logo{height:32px;width:auto;display:block;}
.beta{
  font-size:10px;
  background:var(--accent);
  color:#0b0e1a;
  padding:2px 6px;
  border-radius:6px;
  margin-left:6px;
  font-weight:700;
  vertical-align:middle;
}

.inapp-banner{
  background:linear-gradient(135deg,#3a2a12,#2a2010);
  border:1px solid #7a5a20;
  border-radius:14px;
  padding:14px 16px;
  margin-bottom:16px;
}
.inapp-banner p{margin:0 0 10px;font-size:13px;color:#ffd98e;line-height:1.5;}
.inapp-banner-actions{display:flex;gap:8px;}
.inapp-banner-actions button{
  flex:1;
  padding:10px 12px;
  border-radius:10px;
  border:none;
  font-weight:700;
  font-size:13px;
  cursor:pointer;
}
#btn-open-external{background:#ffd166;color:#241a00;}
.inapp-banner-actions .ghost-btn{background:transparent;border:1px solid #7a5a20;color:#ffd98e;}

.install-banner{
  background:linear-gradient(135deg,#1a2a4a,#101c38);
  border-color:#3a5ca8;
}
.install-banner p{color:#bcd4ff;}
#btn-install-app{background:var(--accent);color:#0b0e1a;}
.install-banner .ghost-btn{background:transparent;border:1px solid #3a5ca8;color:#bcd4ff;}

.nickname-wrap{margin-bottom:14px;}
.nickname-input{
  width:100%;
  background:var(--card);
  border:1px solid #2a2f52;
  border-radius:14px;
  padding:14px 16px;
  color:var(--text);
  font-size:15px;
  box-sizing:border-box;
}
.nickname-input:focus{outline:none;border-color:var(--accent);}
.nickname-error{color:var(--bad);font-size:12px;margin:6px 2px 0;}

.home-nickname{font-size:14px;color:var(--text-dim);margin-bottom:8px;}

.profile-list{display:flex;flex-direction:column;gap:10px;margin-bottom:16px;}
.profile-card{
  display:flex;
  align-items:center;
  gap:12px;
  background:var(--card);
  border:1px solid #2a2f52;
  border-radius:var(--radius);
  padding:12px 14px;
  cursor:pointer;
  text-align:left;
}
.profile-card img{width:44px;height:44px;border-radius:50%;object-fit:cover;flex-shrink:0;}
.profile-card-info{flex:1;min-width:0;}
.profile-card-name{font-weight:800;font-size:15px;}
.profile-card-sub{font-size:12px;color:var(--text-dim);margin-top:2px;}
.profile-card-del{
  background:transparent;
  border:none;
  color:var(--text-dim);
  font-size:16px;
  cursor:pointer;
  padding:6px;
  flex-shrink:0;
}

.save-modal[hidden]{display:none;}
.save-modal{
  position:fixed;
  top:0;
  left:0;
  right:0;
  bottom:0;
  width:100%;
  height:100%;
  background:#05060e;
  z-index:1000;
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:16px;
  padding:24px;
  overflow-y:auto;
  box-sizing:border-box;
}
.save-hint{
  font-size:14px;
  color:#fff;
  line-height:1.5;
  text-align:center;
  max-width:340px;
}
#save-modal-img{
  max-width:min(90vw,360px);
  max-height:65vh;
  border-radius:16px;
  box-shadow:0 20px 50px -20px rgba(0,0,0,.7);
}
#btn-close-save-modal{
  background:rgba(255,255,255,.08);
  border:1px solid #3a3f66;
  color:var(--text);
  padding:10px 24px;
  border-radius:12px;
  font-weight:700;
  cursor:pointer;
}

.screen{animation:fadein .25s ease;}
@keyframes fadein{from{opacity:0;transform:translateY(6px);}to{opacity:1;transform:none;}}

h1{font-size:24px;line-height:1.35;margin:10px 0 4px;}
h2{font-size:20px;margin:6px 0 14px;}
.sub{color:var(--text-dim);font-size:14px;margin:0 0 22px;}

/* Onboarding */
.mascot-hero{
  display:flex;
  justify-content:center;
  margin:8px 0 4px;
}
.mascot-hero img{
  width:150px;
  height:150px;
  object-fit:cover;
  border-radius:50%;
  border:4px solid var(--card-2);
  box-shadow:0 12px 30px -8px rgba(108,140,255,.55), 0 0 0 1px #2a2f52;
  animation:float 3.2s ease-in-out infinite;
}
@keyframes float{
  0%,100%{transform:translateY(0);}
  50%{transform:translateY(-10px);}
}

.npc-tip{
  display:flex;
  align-items:flex-start;
  gap:12px;
  margin-top:20px;
  padding:14px;
  background:var(--card);
  border:1px solid #2a2f52;
  border-radius:var(--radius);
}
.npc-tip img{
  width:52px;
  height:52px;
  border-radius:50%;
  object-fit:cover;
  flex:none;
  border:2px solid var(--card-2);
}
.npc-tip-bubble{
  font-size:13px;
  line-height:1.5;
  color:var(--text);
  padding-top:4px;
}
.npc-tip-bubble b{color:var(--accent);}
.npc-tip-fox .npc-tip-bubble b{color:#ffb454;}

.grade-pick{display:grid;grid-template-columns:1fr 1fr;gap:12px;}
.grade-card{
  background:var(--card);
  border:1px solid #2a2f52;
  border-radius:var(--radius);
  padding:14px;
  text-align:left;
  color:var(--text);
  cursor:pointer;
  box-shadow:0 6px 18px -10px rgba(0,0,0,.5);
  transition:transform .15s ease, border-color .15s ease, box-shadow .15s ease;
}
.grade-card:hover{transform:translateY(-2px);border-color:var(--accent);box-shadow:0 10px 24px -10px rgba(108,140,255,.45);}
.grade-num{font-size:20px;font-weight:800;}
.grade-desc{font-size:12px;color:var(--text-dim);margin-top:4px;line-height:1.4;}

/* Home / tier card */
.tier-card{
  background:linear-gradient(135deg,var(--card-2),var(--card));
  border-radius:var(--radius);
  padding:22px;
  display:flex;
  align-items:center;
  gap:16px;
  border:1px solid #2a2f52;
  box-shadow:0 0 0 1px rgba(255,255,255,.02), 0 14px 30px -14px var(--tier-color);
  margin-top:14px;
  transition:box-shadow .4s ease;
}
.tier-badge{
  position:relative;
  width:64px;
  height:64px;
  border-radius:50%;
  overflow:hidden;
  flex:none;
  border:3px solid var(--tier-color);
  box-shadow:0 0 16px -2px var(--tier-color);
  background:#0f1329;
}
.tier-badge img{width:100%;height:100%;object-fit:cover;display:block;}
.pip-row{
  position:absolute;
  bottom:3px;
  left:50%;
  transform:translateX(-50%);
  display:flex;
  gap:2px;
}
.pip{
  width:6px;
  height:6px;
  border-radius:50%;
  border:1px solid rgba(0,0,0,.5);
  box-shadow:0 0 2px rgba(0,0,0,.6);
}
.tier-info{flex:1;}
.tier-name{font-size:20px;font-weight:800;}
.tier-rating{color:var(--text-dim);font-size:13px;margin-top:2px;}
.streak-pill{
  background:#2a2036;
  color:#ffb454;
  font-size:13px;
  font-weight:700;
  padding:6px 10px;
  border-radius:999px;
  white-space:nowrap;
}

.tier-progress-wrap{margin:16px 0 22px;}
.tier-progress-bar{
  background:#22263f;
  height:10px;
  border-radius:999px;
  overflow:hidden;
}
.tier-progress-fill{
  height:100%;
  background:linear-gradient(90deg,var(--tier-color),#9db3ff);
  width:0%;
  transition:width .4s ease, background .4s ease;
}
.tier-progress-label{font-size:12px;color:var(--text-dim);margin-top:6px;}

.cta-btn{
  width:100%;
  background:var(--accent);
  color:#0b0e1a;
  border:none;
  padding:16px;
  border-radius:14px;
  font-size:16px;
  font-weight:800;
  cursor:pointer;
  transition:opacity .15s ease;
}
.cta-btn:hover{opacity:.9;}
.cta-btn:disabled{opacity:.4;cursor:not-allowed;}

.ghost-btn{
  width:100%;
  background:transparent;
  color:var(--text);
  border:1px solid #33395e;
  padding:14px;
  border-radius:14px;
  font-size:14px;
  font-weight:700;
  cursor:pointer;
}

.link-btn{
  background:none;
  border:none;
  color:var(--text-dim);
  font-size:13px;
  cursor:pointer;
  text-decoration:underline;
  padding:4px 0;
}

.done-msg{
  text-align:center;
  color:var(--good);
  font-size:14px;
  margin-top:10px;
  font-weight:700;
}

.session-count{
  text-align:center;
  color:var(--text-dim);
  font-size:12px;
  margin-top:8px;
}

.home-links{display:flex;flex-direction:column;gap:10px;margin-top:14px;}
.backup-link{text-align:center;margin-top:4px;}

.backup-section{
  background:var(--card);
  border:1px solid #2a2f52;
  border-radius:var(--radius);
  padding:16px;
  margin-bottom:16px;
}
.backup-section h3{margin:0 0 10px;font-size:14px;}
.backup-textarea{
  width:100%;
  background:#0d1024;
  border:1px solid #2a2f52;
  border-radius:12px;
  padding:10px 12px;
  color:var(--text);
  font-size:12px;
  font-family:monospace;
  resize:none;
  box-sizing:border-box;
  margin-bottom:10px;
}
.backup-textarea:focus{outline:none;border-color:var(--accent);}

/* Quiz */
.quiz-progress-wrap{margin:16px 0;}
.quiz-progress-bar{background:#22263f;height:8px;border-radius:999px;overflow:hidden;}
.quiz-progress-fill{height:100%;background:var(--grade-accent);width:10%;transition:width .3s ease, background .4s ease;}
.quiz-progress-label{font-size:12px;color:var(--text-dim);margin-top:6px;text-align:right;}

.quiz-card{
  background:var(--card);
  border:1px solid #2a2f52;
  border-radius:var(--radius);
  padding:22px;
}
.quiz-category{
  display:inline-block;
  background:color-mix(in srgb, var(--grade-accent) 20%, #16193080);
  color:var(--grade-accent);
  font-size:12px;
  font-weight:700;
  padding:4px 10px;
  border-radius:999px;
  margin-bottom:14px;
  transition:background .4s ease, color .4s ease;
}
.quiz-question{font-size:19px;line-height:1.5;font-weight:700;margin-bottom:20px;white-space:pre-line;}

#quiz-input{
  width:100%;
  background:#0f1329;
  border:1px solid #33395e;
  color:var(--text);
  font-size:18px;
  padding:14px;
  border-radius:12px;
  margin-bottom:8px;
}
.quiz-hint{font-size:12px;color:var(--text-dim);min-height:16px;margin-bottom:14px;}

.quiz-feedback{
  margin-top:16px;
  background:var(--card);
  border-radius:var(--radius);
  padding:18px;
  text-align:center;
}
#quiz-feedback-text{font-size:16px;font-weight:800;margin-bottom:14px;}
.feedback-correct{color:var(--good);}
.feedback-wrong{color:var(--bad);}

.quiz-explain{
  text-align:left;
  background:var(--card-2);
  border-radius:14px;
  padding:14px 16px;
  margin-bottom:14px;
}
.quiz-explain h4{margin:0 0 8px;font-size:14px;}
.quiz-explain p{margin:0 0 6px;font-size:13px;line-height:1.5;color:var(--text-dim);}
.quiz-explain-example{color:var(--text)!important;font-weight:600;}

/* 학습(튜터링) 화면 */
.lesson-card{
  background:var(--card);
  border:1px solid #2a2f52;
  border-radius:14px;
  padding:14px 16px;
  margin-bottom:14px;
  text-align:left;
}
.lesson-card-title{margin:0 0 8px;font-size:14px;font-weight:800;color:var(--accent);}
.lesson-card p{margin:0 0 6px;font-size:13px;line-height:1.5;color:var(--text);}
.lesson-card .lesson-example{color:var(--text-dim)!important;font-size:12.5px;margin-bottom:0;}

.feedback-mascot{
  width:56px;
  height:56px;
  object-fit:cover;
  border-radius:50%;
  display:block;
  margin:0 auto 10px;
  border:2px solid var(--card-2);
}
.feedback-mascot.fb-correct{
  animation:fb-correct-pop .5s ease;
  box-shadow:0 0 0 4px rgba(61,220,151,.35);
}
.feedback-mascot.fb-wrong{
  animation:fb-wrong-shake .4s ease;
  box-shadow:0 0 0 4px rgba(255,93,122,.3);
}
@keyframes fb-correct-pop{
  0%{transform:scale(.6);}
  60%{transform:scale(1.15);}
  100%{transform:scale(1);}
}
@keyframes fb-wrong-shake{
  0%,100%{transform:translateX(0);}
  20%{transform:translateX(-8px) rotate(-6deg);}
  40%{transform:translateX(7px) rotate(5deg);}
  60%{transform:translateX(-5px) rotate(-3deg);}
  80%{transform:translateX(4px) rotate(2deg);}
}

/* Result */
.mascot-result{display:flex;justify-content:center;margin-bottom:8px;}
.mascot-result img{
  width:96px;
  height:96px;
  object-fit:cover;
  border-radius:50%;
  border:3px solid var(--card-2);
  box-shadow:0 8px 20px -8px rgba(108,140,255,.5);
}
.mascot-result img.celebrate{
  animation:celebrate-bounce .7s ease;
}
@keyframes celebrate-bounce{
  0%{transform:scale(1) rotate(0);}
  25%{transform:scale(1.18) rotate(-8deg);}
  50%{transform:scale(1) rotate(6deg);}
  75%{transform:scale(1.1) rotate(-4deg);}
  100%{transform:scale(1) rotate(0);}
}
.result-stats{display:flex;gap:10px;margin-bottom:14px;}
.result-stat{
  flex:1;
  background:var(--card);
  border:1px solid #2a2f52;
  border-radius:14px;
  padding:14px 8px;
  text-align:center;
}
.result-stat-num{font-size:20px;font-weight:800;}
.result-stat-label{font-size:12px;color:var(--text-dim);margin-top:4px;}
.levelup-banner{
  background:linear-gradient(90deg,#ffb454,#ff7ad9);
  color:#1a0e00;
  font-weight:800;
  text-align:center;
  padding:10px;
  border-radius:12px;
  margin-bottom:14px;
}
#share-canvas{
  width:100%;
  max-width:360px;
  display:block;
  margin:10px auto 16px;
  border-radius:16px;
  border:1px solid #2a2f52;
}
.result-actions{display:flex;flex-direction:column;gap:10px;margin-bottom:16px;}

/* Tier table */
.tier-table{display:flex;flex-direction:column;gap:8px;}
.tier-row{
  display:flex;
  align-items:center;
  gap:12px;
  background:var(--card);
  border:1px solid #2a2f52;
  border-radius:12px;
  padding:10px 14px;
}
.tier-row.current{border-color:var(--accent);background:var(--card-2);}
.tier-row .tr-badge{
  position:relative;
  width:40px;height:40px;border-radius:50%;overflow:hidden;flex:none;background:#0f1329;
}
.tier-row .tr-badge img{width:100%;height:100%;object-fit:cover;display:block;}
.tier-row .tr-badge .pip-row{bottom:1px;gap:1px;}
.tier-row .tr-badge .pip{width:4px;height:4px;}
.tier-row .tr-name{flex:1;font-weight:700;font-size:14px;}
.tier-row .tr-category{
  display:inline-block;
  margin-left:8px;
  font-size:11px;
  font-weight:600;
  color:var(--text-dim);
  background:#22263f;
  padding:2px 7px;
  border-radius:999px;
}
.tier-row .tr-range{color:var(--text-dim);font-size:12px;}
.back-link{margin-top:18px;}

/* Weak report */
.weak-list{display:flex;flex-direction:column;gap:10px;}
.weak-row{
  background:var(--card);
  border:1px solid #2a2f52;
  border-radius:12px;
  padding:12px 14px;
}
.weak-row-top{display:flex;justify-content:space-between;font-size:14px;font-weight:700;margin-bottom:8px;}
.weak-bar-bg{background:#22263f;height:8px;border-radius:999px;overflow:hidden;}
.weak-bar-fill{height:100%;background:var(--accent);}
.weak-bar-fill.low{background:var(--bad);}
.weak-bar-fill.mid{background:#ffb454;}
.weak-bar-fill.high{background:var(--good);}
.weak-empty{color:var(--text-dim);font-size:14px;text-align:center;padding:30px 0;}