/* Professional light theme */
:root{
  --bg:#f5f7fb;
  --surface:#ffffff;
  --text:#0f172a;
  --muted:#64748b;
  --primary:#2563eb;
  --primary-600:#1d4ed8;
  --danger:#dc2626;
  --border:#e2e8f0;
  --shadow:0 8px 24px rgba(15,23,42,.06);
}
*{box-sizing:border-box}
html,body{height:100%}
body{margin:0;font-family:Inter,system-ui,Segoe UI,Roboto,Arial,sans-serif;background:var(--bg);color:var(--text)}

/* App header */
header, .app-header{position:sticky;top:0;z-index:10;background:rgba(255,255,255,.9);backdrop-filter:saturate(180%) blur(10px);border-bottom:1px solid var(--border);box-shadow:0 2px 10px rgba(15,23,42,.03);padding:12px 20px;display:flex;gap:12px;align-items:center}
.brand{font-weight:800;letter-spacing:.2px}
.grow{flex:1}
.searchbar{display:flex;gap:10px}

/* Containers & cards */
.container{max-width:1200px;margin:0 auto;padding:24px}
.card,.panel{background:var(--surface);border:1px solid var(--border);border-radius:12px;box-shadow:var(--shadow);padding:16px}
.tile{background:var(--surface);border:1px solid var(--border);border-radius:12px;box-shadow:var(--shadow);padding:16px;transition:transform .15s ease, box-shadow .15s ease}
.tile:hover{transform:translateY(-2px);box-shadow:0 10px 28px rgba(15,23,42,.08)}

/* Buttons */
.btn,button,input[type=submit]{background:var(--primary);color:#fff;border:none;border-radius:10px;padding:10px 14px;font-weight:600;cursor:pointer}
.btn:hover,button:hover,input[type=submit]:hover{background:var(--primary-600)}
.btn-secondary{background:#94a3b8;color:#0f172a}
.btn-danger{background:var(--danger)}
.btn-outline{background:#fff;color:var(--primary);border:1px solid var(--primary)}

/* Forms */
input[type=text],input[type=number],input[type=password],textarea,select{width:100%;padding:10px 12px;border-radius:10px;border:1px solid var(--border);background:#fff;color:var(--text)}
input:focus,textarea:focus,select:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(37,99,235,.15)}
label{display:block;margin:8px 0 6px;color:var(--muted);font-size:12px;font-weight:600;text-transform:uppercase;letter-spacing:.04em}

/* Tables */
table{width:100%;border-collapse:separate;border-spacing:0 10px}
th{text-align:left;color:var(--muted);font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:.04em;padding:0 10px}
td{background:var(--surface);border:1px solid var(--border);padding:12px}
tr td:first-child{border-top-left-radius:10px;border-bottom-left-radius:10px}
tr td:last-child{border-top-right-radius:10px;border-bottom-right-radius:10px}

/* Grid */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px}
.pill{padding:4px 10px;border-radius:999px;background:#eef2ff;border:1px solid var(--border);font-size:12px;color:#334155}
.chip{display:inline-block;padding:4px 8px;border:1px dashed var(--border);border-radius:8px;background:#fff;font-family:ui-monospace,Menlo,monospace;font-size:12px}

/* Links */
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}

/* Muted helpers */
.subtle{color:var(--muted)}
.meta{color:var(--muted);font-size:12px}
.section{margin-bottom:24px}
.topnav a{margin-left:12px;color:var(--muted)}
.topnav a:hover{color:var(--primary)}