/* KEEP YOUR SAME CSS HERE (unchanged from your final UI) */
:root{
  --primary:#6C63FF;
  --secondary:#4FC3F7;
  --accent:#FFD166;
  --success:#7BD389;
  --danger:#FF8A80;
  --bg:#F6F8FC;
  --card:#FFFFFF;
  --text:#2A2E4A;
  --muted:#7B88A8;
  --border:#E6EAF2;
  --shadow:0 10px 30px rgba(108,99,255,.08);
}
*{box-sizing:border-box;margin:0;padding:0;}
body{font-family:'Inter',sans-serif;background:var(--bg);color:var(--text);}
a{text-decoration:none;color:inherit;}
.app{display:flex;min-height:100vh;}
.sidebar{width:260px;background:#fff;border-right:1px solid var(--border);padding:18px 14px;transition:.25s ease;display:flex;flex-direction:column;gap:16px;}
.brand{display:flex;align-items:center;gap:12px;padding:8px 10px 16px;}
.brand-logo{width:46px;height:46px;border-radius:14px;background:linear-gradient(135deg,var(--primary),var(--secondary));color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:18px;}
.brand-text h2{font-size:18px;}
.brand-text p{font-size:12px;color:var(--muted);margin-top:2px;}
.nav{display:flex;flex-direction:column;gap:8px;}
.nav a{display:flex;align-items:center;gap:4px;padding:0px 0px;border-radius:16px;font-weight:300;color:var(--text);transition:.2s;}
.nav a:hover,.nav a.active{background:linear-gradient(135deg,rgba(108,99,255,.12),rgba(79,195,247,.12));color:var(--primary);}
.nav-icon{width:40px;height:40px;border-radius:12px;background:#F3F5FB;display:flex;align-items:center;justify-content:center;font-size:18px;}
.main{flex:1;display:flex;flex-direction:column;min-width:0;}
.topbar{background:#fff;border-bottom:1px solid var(--border);padding:14px 18px;display:flex;justify-content:space-between;align-items:center;gap:12px;position:sticky;top:0;z-index:50;}
.top-left{display:flex;align-items:center;gap:12px;flex:1;}
.menu-btn{width:44px;height:44px;border:none;border-radius:14px;background:#F3F5FB;font-size:20px;cursor:pointer;display:none;}
.search{flex:1;display:flex;align-items:center;gap:10px;background:#F8FAFF;border:1px solid var(--border);border-radius:16px;padding:12px 14px;}
.search input{border:none;outline:none;background:transparent;width:100%;font-size:14px;font-family:inherit;}
.top-right{display:flex;align-items:center;gap:12px;}
.chip{padding:10px 14px;border-radius:999px;background:#EEF2FF;color:var(--primary);font-size:13px;font-weight:700;}
.avatar{width:42px;height:42px;border-radius:14px;background:linear-gradient(135deg,var(--primary),var(--secondary));display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;}
.container{padding:20px;padding-bottom:90px;}
.welcome h1{font-size:26px;margin-bottom:6px;}
.welcome p{color:var(--muted);}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:18px;}
.stat-card{background:var(--card);padding:18px;border-radius:22px;box-shadow:var(--shadow);}
.stat-icon{width:44px;height:44px;border-radius:14px;display:flex;align-items:center;justify-content:center;color:#fff;margin-bottom:12px;}
.stat-card h2{font-size:24px;margin-bottom:4px;}
.stat-card p{font-size:13px;color:var(--muted);}
.actions{display:flex;gap:14px;margin-top:18px;flex-wrap:wrap;}
.action{min-width:160px;padding:16px;border-radius:18px;color:#fff;font-weight:700;box-shadow:var(--shadow);}
.content-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:18px;margin-top:18px;}
.card{background:var(--card);border-radius:22px;padding:18px;box-shadow:var(--shadow);}
.card h3{font-size:16px;margin-bottom:12px;}
.section-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px;}
.section-head h3{margin:0;font-size:18px;}
.section-head p{color:var(--muted);font-size:13px;margin-top:4px;}
.form-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;}
.form-group{display:flex;flex-direction:column;gap:8px;}
.form-group.full{grid-column:1/-1;}
label{font-size:13px;font-weight:600;}
.input{width:100%;padding:13px 14px;border-radius:14px;border:1px solid var(--border);font-size:14px;font-family:inherit;outline:none;background:#fff;}
.input:focus{border-color:var(--primary);box-shadow:0 0 0 4px rgba(108,99,255,.08);}
.choice-pill{display:inline-flex;align-items:center;cursor:pointer;}
.choice-pill input{display:none;}
.choice-pill span{display:inline-flex;align-items:center;justify-content:center;padding:12px 16px;border-radius:16px;background:#F4F7FC;border:1px solid var(--border);font-size:13px;font-weight:600;transition:.2s;}
.choice-pill input:checked + span{background:linear-gradient(135deg,rgba(108,99,255,.15),rgba(79,195,247,.15));border-color:var(--primary);color:var(--primary);}
.difficulty-group,.status-group{display:flex;gap:10px;flex-wrap:wrap;}
.upload-box{border:2px dashed #D6DCE8;border-radius:18px;padding:22px;text-align:center;background:#F8FAFF;cursor:pointer;transition:.2s;min-height:130px;display:flex;align-items:center;justify-content:center;}
.upload-box:hover{border-color:var(--primary);background:#F3F6FF;}
.upload-box.dragover{border-color:var(--secondary);background:#ECF9FF;}
.upload-content{font-size:14px;color:var(--muted);font-weight:600;text-align:center;}
.upload-preview-img{width:100%;max-height:180px;object-fit:cover;border-radius:16px;margin-bottom:8px;}
.button-row{display:flex;gap:12px;flex-wrap:wrap;}
.btn{flex:1;min-width:160px;padding:14px;border:none;border-radius:16px;background:linear-gradient(135deg,var(--primary),var(--secondary));color:#fff;font-weight:700;font-size:14px;cursor:pointer;}
.btn-light{background:#F4F7FC;color:var(--text);}
.manage-top{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:14px;}
.search-input{flex:1;min-width:200px;}
.filters{display:flex;gap:8px;flex-wrap:wrap;}
.filter-btn{padding:10px 14px;border-radius:14px;border:1px solid var(--border);background:#F4F7FC;font-weight:600;cursor:pointer;font-size:13px;}
.filter-btn.active{background:linear-gradient(135deg,var(--primary),var(--secondary));color:#fff;border:none;}
/* =========================
   PREMIUM MANAGE PUZZLE CARD
========================= */

.puzzle-list{
  display:flex;
  flex-direction:column;
  gap:14px;
}

.puzzle-item{
  display:flex;
  align-items:center;
  gap:14px;
  padding:14px;
  border-radius:22px;
  background:linear-gradient(180deg,#ffffff,#fbfcff);
  border:1px solid #EEF2F8;
  box-shadow:0 8px 24px rgba(31,41,55,.05);
  transition:all .25s ease;
}

.puzzle-item:hover{
  transform:translateY(-2px);
  box-shadow:0 14px 30px rgba(108,99,255,.10);
  border-color:#DCE4F4;
}

.thumb{
  width:62px;
  height:62px;
  border-radius:18px;
  object-fit:cover;
  flex-shrink:0;
  box-shadow:0 6px 18px rgba(0,0,0,.10);
  border:2px solid #fff;
}

.puzzle-info{
  flex:1;
  min-width:0;
}

.puzzle-info strong{
  display:block;
  font-size:16px;
  font-weight:700;
  line-height:1.35;
  margin-bottom:8px;
  color:var(--text);
  word-break:break-word;
}

.meta{
  display:flex;
  gap:8px;
  flex-wrap:wrap;
  margin-top:0;
}

/* BADGES */
.badge{
  padding:6px 10px;
  border-radius:999px;
  font-size:11px;
  font-weight:700;
  line-height:1;
  letter-spacing:.2px;
  border:1px solid transparent;
  display:inline-flex;
  align-items:center;
  justify-content:center;
}

.badge.cat{
  background:linear-gradient(135deg,#EEF2FF,#E0E7FF);
  color:#4F46E5;
  border-color:#C7D2FE;
}

.badge.diff.easy{
  background:linear-gradient(135deg,#DCFCE7,#BBF7D0);
  color:#15803D;
  border-color:#86EFAC;
}

.badge.diff.medium{
  background:linear-gradient(135deg,#FEF9C3,#FDE68A);
  color:#854D0E;
  border-color:#FACC15;
}

.badge.diff.hard{
  background:linear-gradient(135deg,#FEE2E2,#FECACA);
  color:#991B1B;
  border-color:#FCA5A5;
}

.badge.status{
  background:linear-gradient(135deg,#E0F2FE,#BAE6FD);
  color:#0369A1;
  border-color:#7DD3FC;
}

/* ACTION BUTTONS */
.puzzle-actions{
  display:flex;
  gap:8px;
  flex-shrink:0;
}

.icon-btn{
  width:40px;
  height:40px;
  border:none;
  border-radius:14px;
  cursor:pointer;
  font-size:16px;
  display:flex;
  align-items:center;
  justify-content:center;
  transition:all .2s ease;
  box-shadow:0 4px 10px rgba(0,0,0,.04);
}

.icon-btn:hover{
  transform:translateY(-1px) scale(1.03);
}

.icon-btn.play{
  background:linear-gradient(135deg,#EEF2FF,#E0E7FF);
  color:#4F46E5;
}

.icon-btn.edit{
  background:linear-gradient(135deg,#DCFCE7,#BBF7D0);
  color:#15803D;
}

.icon-btn.delete{
  background:linear-gradient(135deg,#FEE2E2,#FECACA);
  color:#991B1B;
}

/* =========================
   MOBILE / TABLET LAYOUT
========================= */
@media(max-width:768px){

  .puzzle-item{
    display:grid;
    grid-template-columns:62px 1fr;
    grid-template-areas:
      "thumb info"
      "thumb meta"
      "actions actions";
    gap:10px 12px;
    align-items:start;
    padding:14px;
    border-radius:20px;
  }

  .thumb{
    grid-area:thumb;
    width:62px;
    height:62px;
    border-radius:18px;
  }

  .puzzle-info{
    grid-area:info;
    display:flex;
    flex-direction:column;
    justify-content:center;
  }

  .puzzle-info strong{
    font-size:15px;
    margin-bottom:2px;
  }

  .meta{
    grid-area:meta;
    gap:6px;
  }

  .badge{
    font-size:10px;
    padding:6px 9px;
  }

  .puzzle-actions{
    grid-area:actions;
    display:flex;
    justify-content:flex-end;
    gap:10px;
    width:100%;
    padding-top:4px;
  }

  .icon-btn{
    width:42px;
    height:42px;
    border-radius:14px;
    font-size:17px;
  }
}
/* SUCCESS */
.alert.success{
  background:linear-gradient(135deg,#DCFCE7,#BBF7D0);
  color:#166534;
  border-color:#86EFAC;
  border-left-color:#22C55E;
  border-left:6px solid transparent;
}

/* WARNING */
.alert.warning{
  background:linear-gradient(135deg,#FEF3C7,#FDE68A);
  color:#92400E;
  border-color:#FBBF24;
  border-left-color:#F59E0B;
  border-left:6px solid transparent;
}

/* ERROR */
.alert.error{
  background:linear-gradient(135deg,#FEE2E2,#FECACA);
  color:#991B1B;
  border-color:#FCA5A5;
  border-left-color:#EF4444;
  border-left:6px solid transparent;
}

@keyframes fadeIn{
  from{
    opacity:0;
    transform:translateY(-8px);
  }
  to{
    opacity:1;
    transform:translateY(0);
  }
}
.bottom-nav{display:none;position:fixed;bottom:0;left:0;right:0;height:72px;background:#fff;border-top:1px solid var(--border);justify-content:space-around;align-items:center;z-index:100;}
.bottom-nav a{font-size:11px;color:var(--muted);text-align:center;font-weight:600;}
.bottom-nav a.active{color:var(--primary);}
.bottom-nav .icon{width:38px;height:38px;border-radius:12px;background:#F3F5FB;display:flex;align-items:center;justify-content:center;font-size:18px;margin:0 auto 4px;}
.bottom-nav a.active .icon{background:linear-gradient(135deg,rgba(108,99,255,.15),rgba(79,195,247,.15));color:var(--primary);}
@media(max-width:1024px){.stats{grid-template-columns:repeat(2,1fr);} .content-grid{grid-template-columns:1fr;}}
@media(max-width:820px){.sidebar{position:fixed;top:0;left:-100%;width:260px;height:100vh;z-index:200;box-shadow:0 20px 40px rgba(0,0,0,.12);} .sidebar.show{left:0;} .menu-btn{display:block;} .chip{display:none;} .stats{display:flex;overflow-x:auto;gap:12px;padding-bottom:8px;scroll-snap-type:x mandatory;} .stats::-webkit-scrollbar{display:none;} .stat-card{min-width:180px;flex:0 0 auto;scroll-snap-align:start;}}
@media(max-width:640px){.form-grid{grid-template-columns:1fr;} .container{padding:16px;padding-bottom:95px;} .welcome h1{font-size:22px;} .actions{overflow-x:auto;flex-wrap:nowrap;} .action{flex:0 0 auto;min-width:150px;} .bottom-nav{display:flex;} .difficulty-group,.status-group{flex-direction:column;} .choice-pill span{width:100%;} .button-row{flex-direction:column;} .puzzle-item{flex-direction:column;align-items:flex-start;} .puzzle-actions{width:100%;justify-content:flex-end;}}