/* Density Calculator — style.css v1.0 */
.densc-wrap { max-width:580px; margin:0 auto; font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif; color:#1a1a1a; }
.densc-header { display:flex; align-items:center; gap:12px; margin-bottom:20px; }
.densc-icon { font-size:32px; line-height:1; }
.densc-title { font-size:22px !important; font-weight:600 !important; margin:0 0 3px !important; padding:0 !important; border:none !important; color:#1a1a1a !important; }
.densc-sub { font-size:13px; color:#666; margin:0; }
.densc-tabs { display:flex; gap:8px; margin-bottom:20px; flex-wrap:wrap; }
.densc-tab { flex:1 1 auto; min-width:130px; padding:10px 8px; font-size:12.5px; font-weight:500; border:1px solid #d8d8d8; border-radius:10px; background:#fff; color:#555; cursor:pointer; transition:background .13s,color .13s,border-color .13s; display:flex; flex-direction:column; align-items:center; gap:3px; text-align:center; }
.densc-tab:hover:not(.act) { background:#f0f9ff; }
.densc-tab.act { background:#dbeafe; color:#1e40af; border-color:#93c5fd; }
.densc-tab span:first-child { font-size:16px; }
.densc-tab-sub { font-size:11px; font-weight:400; opacity:.7; }
.densc-panel { display:none; }
.densc-panel.act { display:block; }
.densc-section-lbl { font-size:11px; font-weight:700; color:#999; text-transform:uppercase; letter-spacing:.6px; margin-bottom:10px; }
.densc-grid { display:grid; grid-template-columns:1fr 1fr; gap:14px; margin-bottom:4px; }
@media(max-width:440px){ .densc-grid { grid-template-columns:1fr; } }
.densc-lbl { display:block; font-size:13px; font-weight:500; color:#555; margin-bottom:6px; }
.densc-row-iw { display:flex; gap:8px; }
.densc-iw { flex:2; position:relative; }
.densc-unit-iw { flex:1.2; }
.densc-iw input[type="number"] { width:100%; box-sizing:border-box; padding:9px 10px; border:1px solid #d0d0d0; border-radius:8px; font-size:15px; color:#1a1a1a; background:#fff; outline:none; transition:border-color .15s; -moz-appearance:textfield; text-align:center; }
.densc-iw input::-webkit-inner-spin-button,.densc-iw input::-webkit-outer-spin-button { -webkit-appearance:none; }
.densc-iw input:focus { border-color:#1e40af; box-shadow:0 0 0 3px rgba(30,64,175,.1); }
.densc-iw select { width:100%; box-sizing:border-box; padding:9px 8px; border:1px solid #d0d0d0; border-radius:8px; font-size:13px; color:#1a1a1a; background:#fff; outline:none; transition:border-color .15s; appearance:none; -webkit-appearance:none; cursor:pointer; background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='10' viewBox='0 0 24 24' fill='none' stroke='%23999' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E"); background-repeat:no-repeat; background-position:right 6px center; }
.densc-iw select:focus { border-color:#1e40af; }

/* Result card */
.densc-result-card { background:linear-gradient(135deg,#1e40af,#1e3a8a); border-radius:12px; padding:18px 22px; color:#fff; text-align:center; margin-top:14px; margin-bottom:12px; animation:densc-in .22s ease; }
@keyframes densc-in { from{opacity:0;transform:translateY(5px)} to{opacity:1;transform:translateY(0)} }
.densc-res-val { font-size:38px; font-weight:700; font-family:monospace; margin-bottom:4px; }
.densc-res-unit { font-size:16px; opacity:.8; margin-bottom:4px; }
.densc-res-formula { font-size:12px; opacity:.6; }
.densc-conversions { display:grid; grid-template-columns:repeat(3,1fr); gap:8px; border-top:1px solid rgba(255,255,255,.15); padding-top:10px; margin-top:8px; }
.densc-conv-item { text-align:center; }
.densc-conv-val { font-size:14px; font-weight:600; font-family:monospace; }
.densc-conv-unit { font-size:11px; opacity:.65; }

/* Materials */
.densc-materials-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:8px; margin-bottom:14px; }
@media(max-width:460px){ .densc-materials-grid { grid-template-columns:repeat(2,1fr); } }
.densc-mat-card { background:#f0f6ff; border:1px solid #c7d7f8; border-radius:9px; padding:9px 10px; cursor:pointer; transition:background .13s,border-color .13s; }
.densc-mat-card:hover { background:#dbeafe; border-color:#93c5fd; }
.densc-mat-name { font-size:12px; font-weight:600; color:#1e40af; margin-bottom:2px; }
.densc-mat-dens { font-size:13px; font-weight:700; color:#1e3a8a; font-family:monospace; }
.densc-mat-cat { font-size:10px; color:#93c5fd; margin-top:1px; }

.densc-reset-btn { display:block; width:100%; margin-top:10px; padding:9px; font-size:13px; color:#999; background:none; border:1px solid #e8e8e8; border-radius:8px; cursor:pointer; transition:background .13s; }
.densc-reset-btn:hover { background:#f5f5f5; color:#333; }