*{box-sizing:border-box;margin:0;padding:0}
:root{
  --primary:#22c55e;
  --primary-dark:#16a34a;
  --secondary:#3b82f6;
  --accent:#f59e0b;
  --danger:#ef4444;
  --bg:linear-gradient(135deg,#ecfdf5 0%,#d1fae5 50%,#a7f3d0 100%);
  --card:#fff;
  --text:#166534;
  --text-muted:#6b7280;
  --shadow:0 4px 20px rgba(0,0,0,0.08);
  --shadow-lg:0 8px 32px rgba(0,0,0,0.12);
}
html,body{height:100%;font-family:'Noto Sans KR',sans-serif;background:var(--bg);color:var(--text)}
body{display:flex;flex-direction:column;min-height:100vh;background-attachment:fixed}
.hidden{display:none!important}

/* Header */
.header{
  background:linear-gradient(135deg,var(--primary) 0%,var(--primary-dark) 100%);
  color:#fff;
  padding:16px 20px;
  display:flex;
  justify-content:center;
  align-items:center;
  box-shadow:0 4px 16px rgba(34,197,94,0.3);
}
.header h1{font-size:1.4rem;font-weight:700;letter-spacing:-0.5px}

/* Main */
.main{flex:1;padding:24px 20px;overflow-y:auto;display:flex;flex-direction:column}
.screen{display:none;flex-direction:column;gap:24px;animation:fadeIn 0.3s ease}
.screen.active{display:flex}
@keyframes fadeIn{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}

/* Cards */
.card{
  background:var(--card);
  border-radius:24px;
  padding:32px 28px;
  box-shadow:var(--shadow);
  border:1px solid rgba(255,255,255,0.8);
}
.card h2{
  font-size:1.5rem;
  font-weight:700;
  margin-bottom:28px;
  color:var(--text);
  text-align:center;
}
.card h3{
  font-size:1.2rem;
  font-weight:600;
  margin-bottom:20px;
  color:var(--text);
  text-align:center;
}
.home-card{text-align:center;padding:28px 24px}
.home-card h3{margin-bottom:12px}
.time-display{font-size:1.1rem;color:var(--text-muted);margin-top:8px}

/* Buttons */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:16px 32px;
  border:none;
  border-radius:16px;
  font-size:1.1rem;
  font-weight:700;
  cursor:pointer;
  text-align:center;
  width:100%;
  transition:all 0.2s ease;
  letter-spacing:-0.3px;
}
.btn-primary{
  background:linear-gradient(135deg,var(--primary) 0%,var(--primary-dark) 100%);
  color:#fff;
  box-shadow:0 4px 16px rgba(34,197,94,0.35);
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 6px 24px rgba(34,197,94,0.45)}
.btn-primary:active{transform:translateY(0)}

.btn-play{font-size:1.3rem;padding:20px 32px}
.btn-icon{font-size:1.5rem}

.btn-accent{
  background:linear-gradient(135deg,var(--accent) 0%,#d97706 100%);
  color:#fff;
  box-shadow:0 4px 16px rgba(245,158,11,0.35);
}
.btn-accent:hover{transform:translateY(-2px);box-shadow:0 6px 24px rgba(245,158,11,0.45)}

.btn-danger{
  background:linear-gradient(135deg,var(--danger) 0%,#dc2626 100%);
  color:#fff;
  box-shadow:0 4px 16px rgba(239,68,68,0.35);
}

.btn-outline{
  background:transparent;
  border:2px solid var(--primary);
  color:var(--primary);
}
.btn-outline:hover{background:rgba(34,197,94,0.08)}

.btn:disabled{opacity:0.5;cursor:not-allowed;transform:none!important}

.btn-icon-only{
  width:48px;height:48px;
  border-radius:50%;
  background:rgba(255,255,255,0.9);
  border:none;
  font-size:1.4rem;
  cursor:pointer;
  box-shadow:var(--shadow);
  transition:all 0.2s ease;
  display:flex;align-items:center;justify-content:center;
}
.btn-icon-only:hover{transform:scale(1.1)}

/* Home Actions */
.home-actions{display:flex;flex-direction:column;gap:14px;margin-top:8px}

/* Forms */
.form-group{display:flex;flex-direction:column;gap:10px;margin-bottom:24px}
.form-group:last-of-type{margin-bottom:28px}
.form-group label{font-weight:600;font-size:0.95rem;color:var(--text)}
.form-group input{
  padding:18px 16px;
  border:2px solid #e5e7eb;
  border-radius:14px;
  font-size:1rem;
  transition:all 0.2s ease;
  background:#f9fafb;
}
.form-group input:focus{
  border-color:var(--primary);
  outline:none;
  background:#fff;
  box-shadow:0 0 0 4px rgba(34,197,94,0.15);
}
.form-group input::placeholder{color:#9ca3af}

.card .btn{margin-top:12px}
.card .btn + .btn{margin-top:14px}

/* Game Area */
.game-area{
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:clamp(8px, 2vh, 16px);
  padding:clamp(8px, 1.5vh, 16px) 16px;
  height:calc(100dvh - 56px);
  overflow:hidden;
}
.game-header{
  width:100%;
  display:flex;
  justify-content:space-between;
  align-items:center;
  padding:0 4px;
  flex-shrink:0;
}
.game-count{
  font-size:0.9rem;
  font-weight:600;
  color:var(--text-muted);
  background:#fff;
  padding:8px 14px;
  border-radius:20px;
  box-shadow:var(--shadow);
}
.game-mascot{
  font-size:clamp(2.5rem, 8vh, 4rem);
  animation:bounce 1s infinite ease-in-out;
  flex-shrink:0;
}
.game-question{
  font-size:clamp(1.4rem, 5vh, 2.2rem);
  font-weight:800;
  text-align:center;
  color:var(--text);
  padding:clamp(4px, 1vh, 12px) 16px;
  line-height:1.3;
  flex-shrink:0;
}
.game-options{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:12px;
  width:100%;
  max-width:380px;
  margin-top:auto;
  padding-bottom:env(safe-area-inset-bottom, 16px);
  flex-shrink:0;
}
.game-option{
  padding:clamp(12px, 2.5vh, 20px) clamp(10px, 2vw, 16px);
  font-size:clamp(1rem, 3vh, 1.3rem);
  font-weight:700;
  border-radius:clamp(14px, 2vh, 20px);
  background:var(--card);
  border:3px solid #e5e7eb;
  cursor:pointer;
  transition:all 0.2s ease;
  box-shadow:var(--shadow);
  animation:optionIn 0.3s ease backwards;
}
@keyframes optionIn{from{opacity:0;transform:scale(0.8)}to{opacity:1;transform:scale(1)}}
.game-option:hover{border-color:var(--primary);transform:scale(1.03)}
.game-option:active{transform:scale(0.97)}
.game-option.correct{
  border-color:#22c55e;
  background:linear-gradient(135deg,#dcfce7 0%,#bbf7d0 100%);
  animation:correctPulse 0.5s ease;
}
.game-option.wrong{
  border-color:#ef4444;
  background:linear-gradient(135deg,#fee2e2 0%,#fecaca 100%);
  animation:shake 0.4s ease;
}
.game-option.disabled{pointer-events:none}

@keyframes correctPulse{
  0%,100%{transform:scale(1)}
  50%{transform:scale(1.08)}
}
@keyframes shake{
  0%,100%{transform:translateX(0)}
  20%{transform:translateX(-8px)}
  40%{transform:translateX(8px)}
  60%{transform:translateX(-8px)}
  80%{transform:translateX(8px)}
}

/* Streak Badge */
.streak-badge{
  background:linear-gradient(135deg,#ef4444 0%,#f97316 100%);
  color:#fff;
  padding:8px 16px;
  border-radius:20px;
  font-size:1rem;
  font-weight:700;
  animation:streakPop 0.3s ease;
  box-shadow:0 4px 12px rgba(239,68,68,0.3);
}
@keyframes streakPop{from{transform:scale(0)}to{transform:scale(1)}}

/* Timer */
.timer{
  font-size:1.1rem;
  font-weight:700;
  color:#fff;
  background:linear-gradient(135deg,var(--accent) 0%,#d97706 100%);
  padding:10px 18px;
  border-radius:30px;
  box-shadow:0 4px 12px rgba(245,158,11,0.3);
}

/* Mascot */
.mascot{text-align:center;padding:24px 20px 16px}
.mascot-emoji{
  font-size:4.5rem;
  animation:bounce 2s infinite ease-in-out;
}
@keyframes bounce{
  0%,100%{transform:translateY(0)}
  50%{transform:translateY(-12px)}
}
.mascot-msg{
  font-size:1.1rem;
  margin-top:16px;
  color:var(--text);
  font-weight:500;
  line-height:1.6;
}

/* Stats Row */
.stats-row{
  display:flex;
  justify-content:space-around;
  margin:20px 0;
  padding:20px 0;
  border-top:1px solid #e5e7eb;
  border-bottom:1px solid #e5e7eb;
}
.stat-item{display:flex;flex-direction:column;align-items:center;gap:6px}
.stat-num{font-size:1.6rem;font-weight:800;color:var(--primary)}
.stat-label{font-size:0.9rem;color:var(--text-muted)}

/* Stickers */
.sticker-card{text-align:center;padding:32px 24px}
.sticker-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:20px}
.sticker{
  font-size:2.2rem;
  text-align:center;
  padding:14px 8px;
  background:linear-gradient(135deg,#fef3c7 0%,#fde68a 100%);
  border-radius:16px;
  box-shadow:var(--shadow);
  animation:stickerPop 0.4s ease backwards;
}
@keyframes stickerPop{from{transform:scale(0) rotate(-20deg)}to{transform:scale(1) rotate(0)}}
.empty-msg{
  grid-column:1/-1;
  text-align:center;
  color:var(--text-muted);
  font-size:1rem;
  line-height:1.6;
  padding:20px;
}

/* Toast */
.toast{
  position:fixed;
  top:80px;
  left:50%;
  transform:translateX(-50%);
  background:rgba(30,30,30,0.95);
  color:#fff;
  padding:14px 28px;
  border-radius:30px;
  z-index:1000;
  font-weight:600;
  font-size:1.1rem;
  box-shadow:var(--shadow-lg);
  backdrop-filter:blur(8px);
  animation:toastIn 0.3s ease;
}
@keyframes toastIn{from{opacity:0;transform:translateX(-50%) translateY(-20px)}to{opacity:1;transform:translateX(-50%) translateY(0)}}
.toast.hidden{display:none}
.toast-success{background:linear-gradient(135deg,var(--primary) 0%,var(--primary-dark) 100%)}
.toast-error{background:linear-gradient(135deg,var(--accent) 0%,#d97706 100%)}

/* Celebration Particles */
.celebration{
  position:fixed;
  top:20%;
  left:0;
  right:0;
  height:40%;
  pointer-events:none;
  z-index:999;
  overflow:visible;
}
.particle{
  position:absolute;
  top:50%;
  font-size:1.8rem;
  animation:particleBurst 1.2s ease-out forwards;
}
@keyframes particleBurst{
  0%{transform:scale(0) rotate(0deg);opacity:1}
  50%{transform:scale(1.2) rotate(180deg);opacity:1}
  100%{transform:scale(0.5) translateY(80px) rotate(360deg);opacity:0}
}


/* End Screen */
.end-screen{text-align:center;padding:32px 24px}
.end-screen h2{
  font-size:1.6rem;
  margin-bottom:12px;
  color:var(--text);
}
.end-screen p{
  color:var(--text-muted);
  font-size:1rem;
  margin-bottom:20px;
  line-height:1.6;
}
.egg-progress{
  font-size:4rem;
  margin:20px 0;
  animation:hatch 1.5s ease infinite;
}
@keyframes hatch{
  0%,100%{transform:rotate(-5deg)}
  50%{transform:rotate(5deg)}
}

/* Modal */
.modal{
  position:fixed;
  inset:0;
  background:rgba(0,0,0,0.6);
  display:flex;
  align-items:center;
  justify-content:center;
  z-index:100;
  backdrop-filter:blur(4px);
}
.modal-content{
  background:#fff;
  padding:32px 28px;
  border-radius:28px;
  width:92%;
  max-width:360px;
  box-shadow:var(--shadow-lg);
  animation:modalIn 0.3s ease;
  text-align:center;
}
@keyframes modalIn{from{opacity:0;transform:scale(0.9)}to{opacity:1;transform:scale(1)}}
.modal-content h3{
  font-size:1.4rem;
  margin-bottom:8px;
  color:var(--text);
}
.modal-content > p{
  color:var(--text-muted);
  font-size:0.95rem;
  margin-bottom:20px;
}
.modal-content .modal-emoji{font-size:4rem;margin-bottom:16px}
.pin-input{display:flex;gap:12px;justify-content:center;margin:24px 0}
.pin-input input{
  width:52px;
  height:64px;
  text-align:center;
  font-size:1.6rem;
  font-weight:700;
  border:2px solid #e5e7eb;
  border-radius:16px;
  transition:all 0.2s ease;
  background:#f9fafb;
}
.pin-input input:focus{
  border-color:var(--primary);
  outline:none;
  background:#fff;
  box-shadow:0 0 0 4px rgba(34,197,94,0.15);
}

/* Guest Badge */
.guest-badge{
  background:linear-gradient(135deg,var(--accent) 0%,#d97706 100%);
  color:#fff;
  padding:10px 18px;
  border-radius:30px;
  font-size:0.9rem;
  font-weight:700;
  box-shadow:0 4px 12px rgba(245,158,11,0.3);
}

/* Responsive */
@media(min-width:600px){
  .main{max-width:480px;margin:0 auto}
  .card{padding:36px 32px}
  .game-question{font-size:2.8rem}
  .game-mascot{font-size:5rem}
}

/* Small phones (iPhone SE, etc) */
@media(max-height:667px){
  .header{padding:10px 16px}
  .header h1{font-size:1.2rem}
  .game-area{gap:8px;padding:8px 12px}
  .game-mascot{font-size:2.5rem}
  .game-question{font-size:1.5rem;padding:4px 12px}
  .game-option{padding:14px 10px;font-size:1rem}
  .game-options{gap:8px}
  .btn-icon-only{width:40px;height:40px;font-size:1.2rem}
  .timer{padding:6px 12px;font-size:0.9rem}
  .game-count{padding:6px 10px;font-size:0.8rem}
  .streak-badge{padding:6px 12px;font-size:0.85rem}
  .mascot-emoji{font-size:3.5rem}
  .mascot{padding:12px}
  .mascot-msg{font-size:0.95rem}
  .card{padding:20px 16px}
  .btn{padding:14px 24px;font-size:1rem}
}

/* Very small phones */
@media(max-height:568px){
  .header{padding:8px 12px}
  .header h1{font-size:1.1rem}
  .game-mascot{font-size:2rem}
  .game-question{font-size:1.3rem}
  .game-option{padding:12px 8px;font-size:0.95rem;border-radius:14px}
  .mascot-emoji{font-size:3rem}
}

/* Welcome buttons spacing */
#screen-welcome{gap:16px}
#screen-welcome .btn{margin-bottom:0}
#screen-welcome .mascot{margin-bottom:12px}

/* Guest end screen spacing */
#screen-guest-end .card{margin-top:auto;margin-bottom:auto}
#screen-guest-end .btn{margin-top:12px}
#screen-guest-end .btn:first-of-type{margin-top:0}

/* Settings Screen */
.settings-card,.children-card{text-align:left}
.settings-card h3,.children-card h3{text-align:center;margin-bottom:28px}

.setting-group{margin-bottom:28px}
.setting-group:last-of-type{margin-bottom:32px}
.setting-group label{
  display:block;
  font-weight:600;
  font-size:1rem;
  color:var(--text);
  margin-bottom:12px;
}
.setting-group input[type="tel"]{
  width:100%;
  padding:18px 16px;
  border:2px solid #e5e7eb;
  border-radius:14px;
  font-size:1.3rem;
  letter-spacing:10px;
  text-align:center;
  background:#f9fafb;
  transition:all 0.2s ease;
}
.setting-group input[type="tel"]:focus{
  border-color:var(--primary);
  outline:none;
  background:#fff;
  box-shadow:0 0 0 4px rgba(34,197,94,0.15);
}
.setting-hint{
  font-size:0.85rem;
  color:var(--text-muted);
  margin-top:10px;
  text-align:center;
}

.time-selector{
  display:flex;
  gap:12px;
}
.time-btn{
  flex:1;
  padding:16px 12px;
  border:2px solid #e5e7eb;
  border-radius:14px;
  background:#f9fafb;
  font-size:1.05rem;
  font-weight:600;
  cursor:pointer;
  transition:all 0.2s ease;
  color:var(--text);
}
.time-btn:hover{
  border-color:var(--primary);
  background:#ecfdf5;
}
.time-btn.active{
  border-color:var(--primary);
  background:linear-gradient(135deg,#dcfce7 0%,#bbf7d0 100%);
  color:var(--primary-dark);
}

.children-list{
  display:flex;
  flex-direction:column;
  gap:14px;
}
.child-item{
  display:flex;
  align-items:center;
  gap:16px;
  padding:18px 20px;
  border:2px solid #e5e7eb;
  border-radius:18px;
  background:#f9fafb;
  cursor:pointer;
  transition:all 0.2s ease;
}
.child-item:hover{
  border-color:var(--primary);
  background:#ecfdf5;
}
.child-item.active{
  border-color:var(--primary);
  background:linear-gradient(135deg,#dcfce7 0%,#bbf7d0 100%);
}
.child-avatar{font-size:2.2rem}
.child-name{
  flex:1;
  font-weight:600;
  font-size:1.15rem;
}
.active-badge{
  font-size:1.3rem;
  color:var(--primary);
}

/* Screen-specific adjustments */
#screen-login .card,
#screen-register .card,
#screen-add-child .card{
  padding:36px 28px;
}

/* Section divider in settings */
.settings-card .btn{margin-top:8px}
.children-card{margin-top:4px}