:root {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-color: #f8fafc;
    --accent-color: #38bdf8;
    --danger-color: #ef4444;
    --success-color: #22c55e;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    display: flex;
    justify-content: center;
    padding: 20px;
}

.container {
    width: 100%;
    max-width: 800px;
}

header {
    text-align: center;
    margin-bottom: 30px;
}

h1 { color: var(--accent-color); font-size: 1.8rem; }

.card {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
    margin-bottom: 20px;
}

.form-group {
    display: flex;
    gap: 10px;
}

input {
    flex: 1;
    padding: 12px;
    border-radius: 6px;
    border: 1px solid #334155;
    background: #0f172a;
    color: white;
}

button {
    cursor: pointer;
    border: none;
    border-radius: 6px;
    font-weight: bold;
    transition: 0.3s;
}

.btn-add {
    background: var(--success-color);
    color: white;
    padding: 0 20px;
}

.btn-add:hover { filter: brightness(1.2); }

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 15px;
}

th, td {
    text-align: left;
    padding: 12px;
    border-bottom: 1px solid #334155;
}

.btn-remover {
    background: var(--danger-color);
    color: white;
    padding: 5px 10px;
}

.hidden { display: none; }

#mensagem-vazio {
    text-align: center;
    padding: 20px;
    color: #94a3b8;
}