* { box-sizing: border-box; }
body { font-family: Arial, Helvetica, sans-serif; background: #f3f5f9; margin: 0; color: #222; }
.navbar { background: #243b6b; padding: 14px 24px; }
.navbar a { color: #fff; text-decoration: none; margin-right: 18px; font-weight: bold; }
.navbar a:hover { text-decoration: underline; }
.container { max-width: 900px; margin: 30px auto; background: #fff; padding: 28px; border-radius: 8px; box-shadow: 0 2px 8px rgba(0,0,0,.08); }
h1, h2 { margin-top: 0; color: #243b6b; }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 16px; margin-top: 20px; }
.card { display: block; padding: 22px; border-radius: 8px; color: #fff; text-decoration: none; text-align: center; font-size: 18px; font-weight: bold; }
.card small { display: block; font-weight: normal; font-size: 13px; margin-top: 6px; opacity: .9; }
.c-create { background: #2e9e5b; } .c-read { background: #2d7fd3; }
.c-update { background: #e0a100; } .c-delete { background: #d6453d; }
label { display: block; margin: 14px 0 6px; font-weight: bold; }
input[type=text], input[type=email] { width: 100%; padding: 10px; border: 1px solid #bbb; border-radius: 5px; font-size: 15px; }
button, .btn { display: inline-block; padding: 9px 16px; border: 0; border-radius: 5px; color: #fff; font-size: 14px; cursor: pointer; text-decoration: none; }
.btn-green { background: #2e9e5b; } .btn-blue { background: #2d7fd3; }
.btn-yellow { background: #e0a100; } .btn-red { background: #d6453d; }
table { width: 100%; border-collapse: collapse; margin-top: 16px; }
th, td { padding: 10px; border-bottom: 1px solid #e2e2e2; text-align: left; font-size: 14px; }
th { background: #eef1f7; }
.msg { padding: 10px 14px; border-radius: 5px; margin-bottom: 16px; }
.msg.ok { background: #e3f5ea; color: #1d6b3c; }
.msg.err { background: #fde6e4; color: #a02820; }
.empty { color: #777; padding: 14px 0; }