:root{
  --bg:#f5f7fa;
  --card:#ffffff;
  --accent:#2c3e50;
  --accent-light:#34495e;
  --muted:#7f8c8d;
  --dark:#1a1a1a;
  --border:#e0e6ed;
}
*{box-sizing:border-box}
body{font-family:Inter,system-ui,Segoe UI,Helvetica,Arial; margin:0; background:var(--bg); color:#111}
.site-header{background:linear-gradient(135deg,#2c3e50 0%,#34495e 100%); color:#fff; padding:20px 24px;display:flex;justify-content:space-between;align-items:center;box-shadow:0 2px 8px rgba(0,0,0,0.1)}
.site-left{display:flex;gap:12px;align-items:center}
.logo{width:48px;height:auto;display:block}
.site-title{display:flex;flex-direction:column}
.site-title h1{margin:0;font-size:1.2rem}
.site-title p{margin:4px 0 0; opacity:0.95;font-size:0.9rem}
.user-fullname{margin:6px 0 0;font-weight:600;font-size:0.95rem;color:#fff;opacity:0.9}
.layout{max-width:1000px;margin:28px auto;padding:0 20px;display:grid;grid-template-columns:240px 1fr;gap:20px;align-items:start}
.content{display:block}
.card{background:var(--card);border-radius:8px;padding:24px;box-shadow:0 1px 3px rgba(0,0,0,0.08);border:1px solid var(--border)}
.card h2{margin-top:0}
.row{display:flex;flex-wrap:wrap;gap:12px;align-items:center;margin-top:12px}
label{font-size:0.95rem;color:var(--muted)}
input[type=number]{padding:8px;border:1px solid #ddd;border-radius:6px;min-width:120px}
button{background:linear-gradient(135deg,#2c3e50,#34495e);color:#fff;border:none;padding:10px 16px;border-radius:4px;cursor:pointer;font-weight:600;transition:all 200ms ease;box-shadow:0 2px 4px rgba(0,0,0,0.1)}
button:hover{background:linear-gradient(135deg,#1a252f,#212d3a);transform:translateY(-1px);box-shadow:0 4px 8px rgba(0,0,0,0.15)}
.result{margin-left:8px;font-weight:600;color:#111}
/* Home page service cards */
.services-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:20px;margin-top:20px}
.service-card{background:#f9f9f9;border:1px solid var(--border);border-radius:8px;padding:20px;text-align:center;cursor:pointer;transition:all 300ms ease}
.service-card:hover{background:#fff;border-color:#2c3e50;transform:translateY(-4px);box-shadow:0 6px 16px rgba(0,0,0,0.1)}
.service-icon{font-size:48px;margin-bottom:12px}
.service-card h3{margin:12px 0 8px;color:#2c3e50;font-size:1.1rem}
.service-card p{margin:0;color:var(--muted);font-size:0.9rem;line-height:1.4}
/* Sidebar tabs */
.sidebar{display:flex;flex-direction:column;gap:8px;padding:6px 0}
.tab-item{background:transparent;border:none;text-align:left;padding:12px 14px;border-radius:8px;color:var(--muted);font-weight:600;cursor:pointer;transition:all 220ms ease;position:relative;overflow:hidden}
.tab-item::before{content:'';position:absolute;left:0;top:0;width:3px;height:100%;background:#2c3e50;transform:scaleY(0);transition:transform 260ms cubic-bezier(.2,.9,.2,1);transform-origin:center}
.tab-item:hover{color:#2c3e50;background:rgba(44,62,80,0.05);transform:translateX(4px)}
.tab-item:hover::before{transform:scaleY(1)}
.tab-item.active{color:#fff;background:linear-gradient(135deg,#2c3e50,#34495e);box-shadow:0 2px 6px rgba(0,0,0,0.1);transform:none}
.tab-item.active::before{transform:translateX(0)}

.hidden{display:none}

/* Full-page opaque login overlay */
.login-overlay{position:fixed;inset:0;background:linear-gradient(135deg,rgba(30,41,59,0.95),rgba(51,65,85,0.95));display:flex;align-items:center;justify-content:center;z-index:9999}
.login-box{background:#fff;padding:28px;border-radius:16px;min-width:320px;max-width:420px;box-shadow:0 25px 50px rgba(0,0,0,0.15),0 0 1px rgba(99,102,241,0.3);display:flex;flex-direction:column;gap:10px;align-items:stretch;text-align:center;border:1px solid rgba(99,102,241,0.1)}
.login-logo{width:64px;height:auto;margin:0 auto}
.login-box h3{margin:0;color:var(--accent)}
.login-box label{font-size:0.85rem;text-align:left}
.login-box input{padding:10px;border-radius:8px;border:1px solid #e6eefc}
.login-actions{display:flex;gap:10px;justify-content:center;margin-top:12px}
.login-actions button{padding:10px 12px;border-radius:8px}
.login-msg{height:20px;color:#b62828;font-weight:600}

@media(max-width:520px){
  .login-box{min-width:86%;padding:18px}
}

.site-footer{text-align:center;padding:18px;color:var(--muted)}

@media(max-width:759px){
  .layout{grid-template-columns:1fr;}
  .sidebar{flex-direction:row;gap:6px;overflow:auto}
  .tab-item{flex:1 0 auto;padding:10px;border-radius:8px}
}