/* v2.3 UI polish: loader, skeletons, toasts, ripple, transitions */
:root{
  --bg:#f7f8fa;--card:#fff;--text:#111827;--muted:#6b7280;--primary:#0ea5e9;--border:#e5e7eb;--error:#ef4444;
  --shadow:0 10px 20px rgba(2,32,71,.06),0 2px 6px rgba(2,32,71,.03);
}
html[data-theme=dark]{--bg:#0b1220;--card:#0f172a;--text:#e5e7eb;--muted:#94a3b8;--primary:#38bdf8;--border:#1f2937;--error:#f87171;--shadow:0 10px 20px rgba(0,0,0,.35),0 2px 6px rgba(0,0,0,.25)}
*{box-sizing:border-box}
body{margin:0;background:linear-gradient(180deg, rgba(14,165,233,.03), transparent 20%), var(--bg);color:var(--text);font-family:Inter,system-ui,Segoe UI,Roboto,Helvetica,Arial}
.container{max-width:1100px;margin:24px auto;padding:0 16px;animation:fadeIn .4s ease}
.topbar{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;border-bottom:1px solid var(--border);background:linear-gradient(180deg, rgba(14,165,233,.10), transparent), var(--card);position:sticky;top:0;z-index:50;backdrop-filter:saturate(1.1) blur(3px)}
.brand{font-weight:800;letter-spacing:.2px}
.app-title{margin:16px 0 8px 0}
.actions{display:flex;gap:8px}
.btn{position:relative;overflow:hidden;border:1px solid var(--border);background:var(--card);color:var(--text);padding:10px 14px;border-radius:12px;cursor:pointer;box-shadow:var(--shadow);transition:transform .08s ease, box-shadow .2s ease, background .2s ease}
.btn:hover{transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn.primary{background:var(--primary);border-color:var(--primary);color:#fff}
.btn .ripple{position:absolute;border-radius:50%;transform:scale(0);animation:ripple .6s linear;background:rgba(255,255,255,.45)}
.card{background:var(--card);border:1px solid var(--border);border-radius:16px;padding:16px;margin-bottom:16px;box-shadow:var(--shadow);animation:slideUp .25s ease}
.grid{display:grid;gap:12px}.grid.two{grid-template-columns:1fr 1fr}
.flex{display:flex;gap:8px}.flex input{flex:1}
.fieldset{border:1px dashed var(--border);border-radius:12px;padding:12px;margin:6px 0 4px 0;transition:border-color .2s ease}
legend{color:var(--muted);padding:0 6px}
input,select{width:100%;padding:12px;border:1px solid var(--border);border-radius:12px;background:rgba(255,255,255,.6);color:var(--text);transition:border-color .15s ease, box-shadow .15s ease, background .15s ease}
html[data-theme=dark] input, html[data-theme=dark] select{background:rgba(255,255,255,.03)}
input:focus,select:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(14,165,233,.2)}
label{display:flex;flex-direction:column;gap:6px;font-size:14px}
h2,h3{margin-top:0}
.hint{color:var(--muted);font-size:12px;margin-top:4px}
.form-grid{display:grid;gap:12px}
hr{border:none;border-top:1px solid var(--border);margin:8px 0}
.card .actions{display:flex}
.actions.space-between{justify-content:space-between}
.footer{color:var(--muted);font-size:12px;text-align:center;padding:24px 0}
.req{color:var(--error);margin-left:4px}
.errors{color:var(--error);margin-top:8px}
.warn{color:#b45309;margin-top:6px}
.invalid input, .invalid select{border-color:var(--error);box-shadow:0 0 0 3px rgba(239,68,68,.15)}
.pill{border:1px solid var(--border);border-radius:999px;padding:8px 12px}
.link{color:var(--primary);text-decoration:none}
.link:hover{text-decoration:underline}
@media (max-width:800px){ .grid.two{grid-template-columns:1fr} }

/* Loader overlay */
.loader-overlay{position:fixed;inset:0;background:rgba(0,0,0,.15);backdrop-filter:blur(2px);display:none;align-items:center;justify-content:center;z-index:100}
.loader{width:56px;height:56px;border-radius:50%;border:5px solid rgba(14,165,233,.25);border-top-color:var(--primary);animation:spin 1s linear infinite}
.progressbar{position:fixed;top:0;left:0;height:3px;background:linear-gradient(90deg, var(--primary), transparent);width:0;z-index:80;transition:width .2s ease}

/* Skeleton shimmer */
.skel{position:relative;overflow:hidden;background:linear-gradient(90deg, rgba(0,0,0,.06), rgba(255,255,255,.15), rgba(0,0,0,.06));border-radius:10px;height:38px}
.skel::after{content:"";position:absolute;inset:0;animation:shimmer 1.2s infinite}

/* Toasts */
.toast-wrap{position:fixed;right:16px;bottom:16px;display:flex;flex-direction:column;gap:10px;z-index:90}
.toast{background:var(--card);border:1px solid var(--border);border-radius:12px;box-shadow:var(--shadow);padding:10px 12px;min-width:200px;animation:pop .2s ease}

/* Animations */
@keyframes spin{to{transform:rotate(360deg)}}
@keyframes fadeIn{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}
@keyframes slideUp{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}
@keyframes ripple{to{transform:scale(4);opacity:0}}
@keyframes shimmer{0%{transform:translateX(-100%)}100%{transform:translateX(100%)}}
@keyframes pop{from{transform:scale(.96);opacity:0}to{transform:scale(1);opacity:1}}